WO2007108504A1 - 投写型ディスプレイ装置及び光源装置 - Google Patents
投写型ディスプレイ装置及び光源装置 Download PDFInfo
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- WO2007108504A1 WO2007108504A1 PCT/JP2007/055857 JP2007055857W WO2007108504A1 WO 2007108504 A1 WO2007108504 A1 WO 2007108504A1 JP 2007055857 W JP2007055857 W JP 2007055857W WO 2007108504 A1 WO2007108504 A1 WO 2007108504A1
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- laser light
- light source
- homogenizer
- lens
- blue
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- 230000003287 optical effect Effects 0.000 claims abstract description 94
- 230000004907 flux Effects 0.000 claims abstract description 17
- 239000004065 semiconductor Substances 0.000 claims description 209
- 230000010287 polarization Effects 0.000 claims description 40
- 230000005284 excitation Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 10
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- 238000009826 distribution Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 16
- 239000003086 colorant Substances 0.000 description 11
- 238000005253 cladding Methods 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 238000005286 illumination Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
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- 230000006378 damage Effects 0.000 description 2
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- 238000005086 pumping Methods 0.000 description 2
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- 239000000758 substrate Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
- G02B19/0057—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode in the form of a laser diode array, e.g. laser diode bar
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with infrared radiation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
Definitions
- the present invention relates to a projection display device using a laser light source and a light source device.
- a front projection display device and a rear projection display device using a spatial light modulation element such as a transmissive / reflective liquid crystal element or a micromirror array are known.
- a spatial light modulation element such as a transmissive / reflective liquid crystal element or a micromirror array
- front projection type and rear projection type display devices there are three types of spatial light modulation elements corresponding to the three primary colors of red 'green' and blue, and one spatial light modulation element.
- an ultra-high pressure mercury lamp has been used as the light source for a projection display device, but in recent years high-power blue semiconductor lasers have been commercialized.
- SHG green lasers
- a laser that is monochromatic light As a light source, a reproducible color range is widened, and a projection display device with low power consumption can be realized.
- a high-output light source is necessary to obtain a bright screen, but there is a limit to the output that can be obtained with one semiconductor laser, so laser light emitted from multiple semiconductor lasers can be emitted.
- a method for obtaining high output light is required.
- a conventional projection display device there is one that combines light from a solid state light emitting element with a condenser lens to increase the output (for example, see Patent Document 1).
- FIG. 12 is a diagram showing a configuration of a conventional projection display device described in Patent Document 1.
- the light emitted from the solid-state light source 101 is collimated by the lens array 102 and condensed on the rod integrator 104 by the condenser lens 103.
- a uniform light quantity distribution can be obtained on the exit end face of the rod integrator 104.
- Light emitted from the rod integrator 104 By irradiating the liquid crystal spatial light modulator 107 via the lens 105 and the field lens 106, uniform illumination light can be obtained.
- the rod integrator 104 is a rectangular parallelepiped optical element made of a glass member, and the shape of the light incident surface and the shape of the light emission surface are similar to the shape of the illuminated portion of the liquid crystal spatial light modulator.
- display screens have become wider, and screens with an aspect ratio of 16: 9 have increased. Both spatial light modulators and rod integrators have an aspect ratio of 16: 9.
- a light emitting diode, an ultrahigh pressure mercury lamp, or the like is used as a solid state light emitting element in a conventional projection display device.
- both the divergence angle and light-emitting area are symmetric with respect to the optical axis of the rod integrator. Therefore, the conventional projection display device can be handled as a simple point light source that does not need to consider the arrangement of the light source and the rod integrator.
- FIG. 13 is a perspective view showing the structure of the semiconductor laser.
- a semiconductor laser chip 109 includes an active layer 110 and a cladding layer 111.
- an electrode not shown
- laser light is emitted from the light emitting region 112 of the active layer 110 limited by the cladding layer 111. Since the thickness of the active layer 110 is about 1 micron, the energy density in the light emitting region 112 increases when the laser beam becomes high in power, eventually leading to end face destruction. Therefore, in a high-power semiconductor laser, the length of the light emitting region 112 in the X-axis direction (hereinafter referred to as the stripe width) is increased to 10 to 200 microns in order to avoid end face destruction.
- the divergence angle of the laser light emitted from the semiconductor laser is 20 to 40 degrees in full width at half maximum in the Y direction in FIG. 13, and 10 to 15 degrees in the X direction. Therefore, when the laser beam emitted from the light emitting region 112 is condensed by the condenser lens, a condensed spot having a greatly different aspect ratio is formed. In this way, the light emitted from the semiconductor laser differs from the light emitted from the light emitting diode.
- the arrangement of the rod integrator and the semiconductor laser is not described in detail in Patent Document 1 described above.
- the angle between the optical axis of the rod integrator and the outermost beam of the incident light beam is determined by the relationship with the F-number of the projection lens. Since the light is collected on the rod integrator by the condensing lens, the ratio of the aperture of the condensing lens to the focal length is the angle of light incident on the rod integrator as it is. Increasing the number of solid-state light emitting elements while maintaining this angle increases the diameter of the condensing lens, which inevitably increases the focal length, leading to an increase in the size of the apparatus.
- Patent Document 1 JP 2005-300712 A
- the present invention has been made to solve the above-described problem. By optimizing the arrangement of the laser light source and the homogenizer, it is possible to achieve downsizing and achieve high output.
- An object of the present invention is to provide a projection display device and a light source device capable of obtaining light.
- a projection display device includes a laser light source having a light emitting region that emits elliptical laser light, and a condensing lens that condenses the laser light emitted from the laser light source.
- a homogenizer having a rectangular incident surface on the condensed light flux of the condenser lens, a spatial light modulation element for modulating laser light emitted from the homogenizer, and a laser modulated by the spatial light modulation element
- a projection lens for projecting light, the entrance surface of the homogenizer is rectangular, and the laser light source has a long axis direction of the light emitting region and a long side direction of the entrance surface of the homogenizer parallel to each other.
- the laser light source has the light emitting region that emits elliptical laser light, and the laser light emitted from the laser light source is condensed by the condenser lens.
- the homogenizer has a rectangular entrance surface on the condensed light flux of the condenser lens.
- the laser light emitted from the homogenizer is modulated by the spatial light modulator and modulated by the spatial light modulator.
- the laser beam is projected by the projection lens.
- the incident surface of the homogenizer is rectangular, and the laser light source is arranged so that the long axis direction of the light emitting region and the long side direction of the homogenizer incident surface are parallel to each other.
- the laser light source is arranged so that the long axis direction of the light emitting region of the laser light source and the long side direction of the incident surface of the homogenizer are parallel to each other, so that the laser light emitted from the laser light source can be efficiently homogenized.
- the arrangement of the laser light source and the homogenizer can be optimized to achieve downsizing, and high-power light can be obtained from the homogenizer.
- a light source device includes a laser light source having a light emitting region for emitting elliptical laser light, a condensing lens for condensing the laser light emitted from the laser light source, A homogenizer having a rectangular incident surface on the condensed light flux of the condensing lens, the incident surface of the homogenizer is rectangular, and the laser light source includes a major axis direction of the light emitting region and a homogenizer. Arranged so that the long side direction of the incident surface is parallel.
- the laser light source has a light emitting region that emits elliptical laser light, and the laser light emitted from the laser light source is condensed by the condenser lens, and the collected light flux of the condenser lens
- a homogenizer having a rectangular entrance surface is disposed thereon.
- the entrance surface of the homogenizer is rectangular, and the laser light source is arranged so that the long axis direction of the light emitting region and the long side direction of the entrance surface of the homogenizer are parallel.
- the laser light source is arranged so that the long axis direction of the light emitting region of the laser light source and the long side direction of the incident surface of the homogenizer are parallel to each other, so that the laser light emitted from the laser light source is efficiently homogenized.
- the arrangement of the laser light source and the homogenizer can be optimized to achieve downsizing, and high-power light can be obtained from the homogenizer.
- a projection display apparatus includes a plurality of laser light sources and a plurality of collectors provided for each of the plurality of laser light sources for condensing laser light emitted from the plurality of laser light sources.
- a projection lens that projects the laser light modulated by the spatial light modulation element wherein the plurality of laser light sources includes a red laser light source that emits red laser light, and a blue laser light source.
- a blue laser light source that emits laser light and a green laser light source that emits green laser light, and the red laser light source and the blue laser light source are arranged so as to be symmetrical with respect to the optical axis of the homogenizer.
- the green laser light source is disposed on the optical axis of the homogenizer, and the plurality of condensing lenses are for red light that condenses the red laser light emitted from the red laser light source on the incident surface of the homogenizer.
- the blue condensing lens for condensing the blue laser light emitted from the blue laser light source on the entrance surface of the homogenizer, and the green laser light source A green condensing lens that condenses the emitted green laser light before entering the homogenizer, and the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light Is the same as the angle between the optical axis of the homogenizer and the red laser light or the blue laser light at the condensing point of the red condenser lens or the blue condenser lens.
- the laser beams emitted from the plurality of laser light sources are collected by the plurality of condensing lenses provided for the plurality of laser light sources.
- the homogenizer has a rectangular incident surface on the condensed light flux of a plurality of condensing lenses, and the laser light emitted from the homogenizer is modulated by the spatial light modulator and is modulated by the spatial light modulator.
- One light is projected by the projection lens.
- a red laser light source that emits red laser light and a blue laser light source that emits blue laser light are arranged so as to be axisymmetric with respect to the optical axis of the homogenizer, and emit green laser light.
- a green laser light source is disposed on the optical axis of the homogenizer.
- Red laser light emitted from the red laser light source is condensed at one point by the red condensing lens
- blue laser light emitted from the blue laser light source is condensed at one point by the blue condensing lens.
- the lens collects the green laser light emitted from the green laser light source before entering the homogenizer.
- the angle between the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light is the light of the homogenizer at the condensing point of the red condensing lens or the blue condensing lens. Same as the angle between the axis and the red or blue laser light become.
- the red laser light source and the green laser light source which are more complicated than the blue laser light source, which are semiconductor lasers are arranged on the optical axis of the homogenizer, so that the apparatus can be downsized. Even if the green laser light source is arranged on the optical axis of the homogenizer, the green laser light is incident on the homogenizer incident surface at a predetermined angle, so that the light quantity distribution of the green laser light is changed between the red and blue laser lights. Uniformity can be achieved to the same extent as the light quantity distribution, and color unevenness can be suppressed.
- FIG. 1 is a YZ side view of a projection display apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is an XZ side view of the projection display apparatus in the first embodiment of the present invention.
- FIG. 3 is an XY side view of the projection display apparatus in the first embodiment of the present invention.
- FIG. 4 is a diagram for explaining the positional relationship between the semiconductor laser and the rod integrator.
- FIG. 5 is a diagram for explaining the positional relationship between a semiconductor laser having a plurality of light emitting regions and a rod integrator.
- FIG. 6 is a diagram showing a configuration of a projection display apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a diagram showing a configuration of a projection display apparatus according to Embodiment 3 of the present invention.
- FIG. 8 is a diagram showing a configuration of a projection display apparatus in a fourth embodiment of the present invention.
- FIG. 9 is an XY side view of a laser light source according to Embodiment 4 of the present invention.
- FIG. 10 shows a configuration of a green laser according to Embodiment 4 of the present invention.
- FIG. 11 is a diagram for explaining laser beams of respective colors incident on a rod integrator in the fourth embodiment.
- FIG. 12 is a diagram showing a configuration of a conventional projection display apparatus.
- FIG. 13 is a perspective view showing a structure of a conventional semiconductor laser.
- FIG. 1 and 2 are diagrams showing a configuration of a projection display apparatus according to Embodiment 1 of the present invention.
- the XYZ axes are defined as shown in Figs.
- FIG. 1 is a YZ side view of the projection display apparatus according to Embodiment 1 of the present invention
- FIG. 2 is an XZ side view of the projection display apparatus according to Embodiment 1 of the present invention.
- the projection display device includes a laser light source 1, a condenser lens 2, a lenticular lens 3, a rod integrator 4, a relay lens 5, a field lens 6, A spatial light modulator 7 and a projection lens 8 are provided.
- the laser light source 1 is composed of six semiconductor lasers as will be described later, and emits red or blue laser light.
- the condenser lens 2 is composed of six lenses as will be described later, and condenses the laser light emitted from the laser light source 1.
- the lenticular lens 3 is a lens in which a cylindrical lens group aligned in the Y-axis direction and a cylindrical lens group aligned in the X direction are integrated. The lenticular lens 3 is held so as to rotate around the Z axis by a drive element (not shown).
- the rod integrator 4 is composed of a rectangular parallelepiped glass member, and uniformizes the light quantity distribution of the incident laser light.
- the entrance surface of the rod integrator 4 has a rectangular shape with the long side in the Y-axis direction and the short side in the X-axis direction. Note that the rod integrator 4 in the present embodiment corresponds to an example of a homogenizer.
- the relay lens 5 and the field lens 6 form an image of the exit end face of the rod integrator 4 on the spatial light modulator 7.
- the spatial light modulation element 7 is composed of a liquid crystal panel, for example, and modulates the image of the exit end face of the rod integrator 4.
- the projection lens 8 projects an image modulated by the spatial light modulator 7 onto the screen, not shown.
- FIG. 3 is an XY side view of the projection display apparatus according to Embodiment 1 of the present invention.
- FIG. 3 shows a configuration when the rod integrator 4 is viewed from the laser light source 1 in order to avoid complication.
- the laser light source 1 includes a plurality of semiconductor lasers la.
- the condenser lens 2 includes a plurality of condenser lenses 2a to 2f.
- Semiconductor laser la ⁇ If is arranged so as to be axially symmetric with respect to the optical axis of rod integrator 4. Further, the stripe width direction of each light emitting region of the semiconductor laser la ⁇ : If is arranged so as to be parallel to the long side of the rod integrator 4.
- Semiconductor laser la ⁇ Relative position of If and condenser lenses 2a ⁇ 2f is semiconductor laser la ⁇ : Laser light emitted from If passes through lenticular lens 3 and enters rod integrator 4 respectively. After adjustment, it is fixed.
- FIG. 4 is a diagram for explaining the positional relationship between the semiconductor laser and the rod integrator.
- the configuration of the semiconductor laser la will be described as an example.
- Other semiconductor lasers lb ⁇ The configuration of If is the same as that of the semiconductor laser la.
- the semiconductor laser la has a substrate 21, an active layer 22, an upper light guide layer 23, a lower light guide layer 24, a p-type cladding layer 25, an n-type cladding layer 26, a p-type electrode 27, and an n-type electrode 28. Each of which is stacked.
- the active layer 22 recombines the injected electrons and holes, and emits light having a wavelength corresponding to the band gap energy.
- the upper light guide layer 23 and the lower light guide layer 24 confine the emitted light in the active layer 22.
- the p-type cladding layer 25 and the n-type cladding layer 26 increase the electron density and hole density in the junction region of the active layer 22.
- the p-type electrode 27 and the n-type electrode 28 are connected to the positive electrode and the negative electrode of the power supply, respectively.
- the thickness of the active layer 22 is, for example, 1 ⁇ m.
- the length in the width direction of the light emitting portion of the active layer 22 is, for example, 7 zm in the case of blue laser light, and is, for example, 150 zm in the case of red laser light. Therefore, elliptical light is emitted from the light emitting region 29 of the active layer 22.
- the incident surface 4a of the rod integrator 4 has a rectangular shape.
- the semiconductor laser la has the major axis direction of the light emitting region 29 (the stripe width direction indicated by the arrow 31 in FIG. 4), the long side direction of the incident surface 4a of the rod integrator 4 (the direction indicated by the arrow 32 in FIG. 4), Are arranged in parallel.
- the laser beams emitted from the semiconductor lasers la to lf are condensed by the condensing lenses 2a to 2f so that the intersections of the respective condensed light beams coincide with the incident surface of the rod integrator 4.
- the stripe width direction of each active layer of the semiconductor laser la ⁇ If and the long side direction of the rod integrator 4 are parallel to each other, so that the light incident on the rod integrator 4 is not lost. Since the maximum condensing spot can be obtained, the light quantity distribution on the exit end face of the rod integrator 4 can be made uniform.
- the lenticular lens 3 has a function of temporally changing the incident position and the incident angle of the laser light incident on the rod integrator 4 by rotating around the Z axis by a driving element (not shown).
- the light quantity distribution on the exit end face of 4 is made uniform.
- the laser beam is highly coherent, a random interference pattern called speckle noise is formed when light reflected from fine irregularities on the screen enters the human eye and interferes with it.
- speckle noise By driving the lens 3, random interference patterns can be averaged and speckle noise can be reduced.
- the light incident on the rod integrator 4 undergoes multiple internal reflections, resulting in a substantially uniform light distribution at the exit end face.
- the semiconductor lasers la to lf symmetrically with respect to the optical axis of the rod integrator 4
- the light quantity distribution of the light emitted from each semiconductor laser becomes axially symmetric with each other. Distribution uniformity is improved.
- the angle formed between the outermost edge light of the light emitted from the rod integrator 4 and the optical axis of the rod integrator 4 is the angle formed by the light incident on the rod integrator 4 from the semiconductor laser la to lf with the optical axis of the rod integrator 4. And the angle formed by the light refracted by the lenticular lens 3 with respect to the optical axis of the rod integrator 4 and the optical axis of the rod integrator 4. Therefore, it is necessary to make the sum of these angles match the taking-in angle of the relay lens 5.
- the light emitted from the rod integrator 4 and the relay lens 5 The spatial light modulator 7 is irradiated with the lens 6.
- the spatial light modulator 7 spatially modulates the emitted light based on a signal having a control circuit power not shown.
- the projection lens 8 forms an image by projecting the modulated light spatially modulated by the spatial light modulator 7 onto a screen (not shown).
- the configuration of the semiconductor laser la ⁇ If, the stripe width direction of each active layer of the semiconductor laser la ⁇ : If and the long side direction of the rod integrator 4 are parallel to each other. Since the maximum condensing spot can be obtained within a range where the light incident on the rod integrator 4 cannot be scattered, the light quantity distribution on the exit end face of the rod integrator 4 can be made uniform. In addition, since the semiconductor lasers la to If are arranged so as to be axially symmetric with respect to the optical axis of the rod integrator 4, the light quantity distribution of the light emitted from each semiconductor laser becomes axially symmetric with each other. As a result, the uniformity of the light quantity distribution at the exit end face of 4 will be improved, and a bright and uniform light quantity distribution on the screen will be obtained.
- a light pipe having a hollow inside may be used instead of the rod integrator 4.
- the number of semiconductor lasers is not limited to six, and even shoes may be arranged so as to be axially symmetric with respect to the optical axis of the rod integrator 4.
- the semiconductor laser la- If is limited to one light emitting region for one laser chip. It is not necessary, and is a Marquetter type semiconductor laser in which a plurality of light emitting regions are arranged along the active layer. Moyore.
- FIG. 5 is a diagram for explaining the positional relationship between a semiconductor laser having a plurality of light emitting regions and a rod integrator.
- the Marchitter-type semiconductor laser la ′ includes a substrate 21, an active layer 22, an upper light guide layer 23, a lower light guide layer 24, a p-type cladding layer 25, an n-type cladding layer 26, a p-type electrode 27 and n A mold electrode 28 is provided, and each is laminated.
- the multi-emitter type semiconductor laser la ' has a plurality of light emitting regions 29a, 29b, and 29c that are arranged on a straight line along the active layer. Elliptical light is emitted from the light emitting regions 29a, 29b, and 29c of the active layer 22, respectively.
- the incident surface 4a has a rectangular shape.
- the semiconductor laser la ′ has a plurality of light emitting regions 29a, 29b, 2
- the direction in which the lines 9c are arranged (the stripe width direction indicated by the arrow 33 in FIG. 5) and the long side direction of the incident surface 4a of the rod integrator 4 (the direction indicated by the arrow 32 in FIG. 5) are arranged in parallel.
- the Marchemiter-type semiconductor laser la ′ shown in FIG. 5 has three light-emitting regions.
- the present invention is not particularly limited to this. It has 4 or more light emitting areas.
- FIG. 6 is a diagram showing the configuration of the projection display apparatus according to Embodiment 2 of the present invention.
- the projection display apparatus includes a laser light source 1, a condenser lens 2, a lenticular lens 3, a rod integrator 4, a relay lens 5, a field lens 6, and a spatial light modulator. 7, a projection lens 8, a convex lens 9, and a concave lens 10.
- the convex lens 9 and the concave lens 10 constitute a telephoto type optical system, and are configured to condense on the incident surface of the parallel optical power S rod integrator 4 incident on the convex lens 9.
- the light emitting areas of the plurality of semiconductor lasers constituting the laser light source 1 are adjusted to coincide with the focal points of the respective lenses constituting the condenser lens 2, and the light emitted from the semiconductor laser is condensed.
- Each lens 2 produces parallel light parallel to the optical axis of the rod integrator 4.
- the parallel light emitted from the condenser lens is collected by the convex lens 9 and the concave lens 10, passes through the lenticular lens 3, and then enters the incident end surface of the rod integrator 4. Since the subsequent operations are the same as those of the projection display apparatus in the first embodiment, description thereof will be omitted.
- the distance between the convex lens 9 and the concave lens 10 is smaller than the focal length of the telephoto lens composed of the convex lens 9 and the concave lens 10, so the laser light source 1 to the rod integrator.
- the interval up to 4 can be shortened, and the projection display device can be downsized.
- FIG. 7 is a diagram showing a configuration of a projection display apparatus according to Embodiment 3 of the present invention.
- the projection display apparatus includes a laser light source 1, a condensing lens 2, a lenticular lens 3, a rod integrator 4, a relay lens 5, a fine lens 6, and spatial light modulation.
- An element 7, a projection lens 8, a first convex lens 11 and a second convex lens 12 are provided.
- the distance between the first convex lens and the second convex lens is set to about the sum of the respective focal lengths, and the light collected by the first convex lens 11 is incident on the rod integrator 4 by the second convex lens 12.
- the first convex lens 11 and the second convex lens 12 form a telephoto type optical system, and the lens interval can be made smaller than the combined focal length.
- the light emitting areas of the plurality of semiconductor lasers constituting the laser light source 1 are adjusted so as to coincide with the focal points of the respective lenses constituting the condenser lens 2, and the light emitted from the semiconductor laser is condensed.
- Each lens 2 produces parallel light parallel to the optical axis of the rod integrator 4.
- the parallel light emitted from the condenser lens is condensed by the first convex lens 11 and the second convex lens 12, passes through the lenticular lens 3, and then enters the incident end surface of the rod integrator 4. Since the subsequent operations are the same as those of the projection display apparatus in the first embodiment, description thereof will be omitted.
- the first convex lens 11 and the second convex lens 1 are compared with the combined focal length of the telephoto type lens composed of the first convex lens 11 and the second convex lens 12.
- the distance from 2 is smaller. Therefore, the size of the laser light source 1, that is, the first size is maintained while maintaining the angle between the outermost edge light incident on the rod integrator 4 and the optical axis of the rod integrator 4.
- the diameter of the convex lens 11 is increased, the distance from the laser light source 1 to the rod integrator 4 can be made shorter than the combined focal length, and a compact and high-power projection display device can be provided. It becomes.
- FIG. 8 is a diagram showing a configuration of a projection display apparatus according to Embodiment 4 of the present invention.
- the same components as those in FIG. 6 are denoted by the same reference numerals and description thereof is omitted.
- the projection display apparatus includes a laser light source 13, a collecting lens 2, a lenticular lens 3, a rod integrator 4, a relay lens 5, a field lens 6, and a spatial light modulator. 7, projection lens 8, convex lens 9, concave lens 10 and half-wave plate 14 are provided.
- the laser light source 13 is composed of laser light sources of three primary colors as will be described later.
- the half-wave plate 14 rotates the plane of polarization.
- FIG. 9 is an XY side view of the laser light source 13 shown in FIG.
- the laser light source 13 includes red semiconductor lasers 13a, 13c, 13d, and 13f, blue semiconductor lasers 13b and 13e, and a green laser 13g.
- the red semiconductor lasers 13a, 13c, 13d, and 13f emit red laser light whose polarization plane is perpendicular to the stacking direction of the active layers.
- the blue semiconductor lasers 13b and 13e emit blue laser light whose polarization plane is parallel to the stacking direction of the active layers.
- the green laser 13g emits green laser light.
- the condenser lens 2 includes a plurality of condenser lenses 2a to 2g.
- the condensing lenses 2a, 2c, 2d, and 2f condense the red laser beams emitted from the red semiconductor lasers 13a, 13c, 13d, and 13f on the incident surface of the rod integrator 4.
- the condenser lenses 2b and 2e collect the blue laser light emitted from the blue semiconductor lasers 13b and 13e on the incident surface of the rod integrator 4.
- the condensing lens 2g condenses the green laser light emitted from the green semiconductor laser 13g before the incident surface of the rod integrator 4.
- FIG. 10 is a diagram showing a configuration of the green laser 13g shown in FIG. 9.
- the green laser 13g includes an infrared semiconductor laser 15, a laser medium 16, and an SHG (Second Harmonic Generation) element 17.
- the infrared semiconductor laser 15 emits excitation laser light having a wavelength of, for example, 809 nm.
- the laser medium 16 is composed of, for example, a YAG crystal.
- a reflective film that reflects light of 1064 nm is formed on the infrared semiconductor laser 15 side of the laser medium 16.
- a reflection film that transmits 532 nm light and reflects 1064 nm light is formed on the surface opposite to the laser medium 16.
- the SHG element 17 is made of, for example, a KTP crystal or a lithium niobate crystal.
- the infrared semiconductor laser 15 corresponds to an example of an excitation semiconductor laser light source
- the SHG element 17 corresponds to an example of a wavelength conversion element.
- the laser medium 16 When the laser medium 16 is excited by the laser light emitted from the infrared semiconductor laser 15, a 1064 nm laser light is emitted. A second harmonic is generated while this laser beam travels back and forth between the laser medium 16 and the SHG element 17 as a fundamental wave, and a 532 nm green laser beam is emitted from the SHG element 17.
- the laser light emitted from the green laser 13g emits substantially parallel light.
- the polarization plane of the green laser 13g is set parallel to the Y axis.
- the other semiconductor lasers 13a to 13f are installed so that the stripe width direction of the active layer is parallel to the X axis.
- the polarization planes of the red semiconductor lasers 13a, 13c, 13d, and 13f are parallel to the X axis, and the polarization planes of the blue semiconductor lasers 13b and 13e are parallel to the Y axis.
- laser light emitted from the semiconductor lasers 13a to 13f of the laser light source 13 is converted into parallel light by the condenser lens 2, and the convex lens 9 and the concave lens 10 together with the green laser light that is originally parallel light. Is incident on the incident end face of the rod integrator 4.
- the polarization plane of the laser light emitted from the red semiconductor lasers 13a, 13c, 13d, and 13f of the laser light source 13 is originally parallel to the X axis, but when passing through the half-wave plate 14, Y Rotated to be parallel to the axis. Therefore, the polarization plane of the laser light incident on the rod integrator 4 is all parallel to the Y axis. Since the subsequent operations are the same as those of the projection display apparatus in the first embodiment, the description thereof is omitted.
- the green laser light when the condensing point of the green laser light is set on the same incident surface of the rod integrator 4 as the condensing points of the red laser light and the blue laser light, the green laser light is Since the 13g is placed on the optical axis of the rod integrator 4, the green laser light is emitted without being reflected in the rod integrator 4, and the light quantity distribution of the green laser light is not uniformized. There is a fear. Therefore, in the fourth embodiment, the green laser beam is rod-in.
- the laser light source 13, the condensing lens 2, the convex lens 9 and the concave lens 10 are arranged so that the angle between the optical axis of the rod integrator 4 and the red laser light or blue laser light at the condensing point where Be placed.
- FIG. 11 is a diagram for explaining the laser beams of the respective colors incident on the rod integrator 4 in the fourth embodiment.
- the red laser beam 131 emitted from the red semiconductor laser 13a is condensed on the incident surface 4a of the rod integrator 4 by the condenser lens 2a, and the red laser beam 132 emitted from the red semiconductor laser 13c is collected by the condenser lens 2c.
- the light is focused on the incident surface 4 a of the rod integrator 4.
- the green laser beam 133 emitted from the green laser 13g is collected by the condenser lens 2g before entering the rod integrator 4.
- the condensing point Pa of the green laser beam 133 exists between the concave lens 10 and the lenticular lens 3.
- the green laser 13g is arranged on the optical axis of the rod integrator 4, the green laser light is incident on the incident surface of the rod integrator 4 with a predetermined angle.
- the light amount distribution can be made uniform to the same extent as the light amount distribution of the red and blue laser beams, and the occurrence of color unevenness can be suppressed.
- the spatial light modulator 7 is irradiated with illumination light of the three primary colors. Therefore, if a filter of the three primary colors is attached to each pixel of the spatial light modulator 7, a full color Will be displayed. Alternatively, if each laser element constituting the laser light source 13 is pulse-driven for each color and the spatial light modulator 7 is time-division driven for each color in synchronism with this, a full-color image is displayed in the same manner.
- the polarization plane of the laser light of the three primary colors is made to coincide, so that the polarization plane of the laser light incident on the spatial light modulator 7 is changed. Can only be in one direction.
- the spatial light modulator 7 is a liquid crystal panel, the polarization plane of the incident side polarizer can be easily matched, and the light utilization efficiency can be increased.
- the spatial light modulator 7 is a micromirror array, it can be configured to use S-polarized light with high reflectivity for all three primary colors, so that the light utilization efficiency can be increased.
- the present invention is particularly limited to this. If the polarization plane is parallel to the active layer, a half-wave plate is not necessary.
- a wavelength plate that functions as a half-wave plate for the wavelength of blue laser light and functions as a one-wave plate for the wavelengths of green laser light and red laser light The number of members can be reduced by setting the wave plate to a location where the light flux is small, such as before and after the rod integrator 4.
- all the semiconductor lasers 13a to 13f are installed so that the stripe width direction of the active layer is parallel to the long side direction of the rod integrator 4.
- the blue semiconductor lasers 13b and 13e are not particularly limited to this, and may not be installed so that the stripe width direction of the active layer is parallel to the long side direction of the rod integrator 4.
- the light emitting region of the blue semiconductor lasers 13b and 13e has a short axis (active layer thickness) of 1 ⁇ m, for example, and a long axis (light emitting active layer width) of 7 ⁇ m, for example.
- the aspect ratio of the light emitting area is smaller than that of red laser light.
- the blue semiconductor lasers 13b and 13e are installed so that the stripe width direction of the active layer is perpendicular to the long side direction of the rod integrator 4, the long axis of the laser beam on the incident surface of the rod integrator 4 Laser light whose length is shorter than the length of the short side of the rod integrator 4 is incident on the incident surface of the rod integrator 4 without being scattered. Therefore, the red semiconductor lasers I3a, 13c, 13d, and 13f are installed so that the stripe width direction of the active layer is parallel to the X axis, and the blue semiconductor lasers 13b and 13e are arranged so that the stripe width direction of the active layer is the X axis. You may install it so that it may be perpendicular to.
- the long axis direction of the light emitting region and the rod integrator 4 Red semiconductor laser 13a, 13c, 1 so that the long side direction of the incident surface is parallel Since 3d and 13f are arranged, the laser light emitted from the red semiconductor lasers 13a, 13c, 13d and 13f can be efficiently guided to the rod integrator 4.
- the long axis direction of the light emitting region and the long side of the entrance surface of the rod integrator 4 Even if the direction is not parallel, the laser beam is guided to the rod integrator 4 without being emitted.
- the long axis direction of the emission region of the blue semiconductor lasers 13b and 13e and the rod integrator 4 can be freely arranged without having to be parallel to the long side direction of the incident surface.
- a projection display device includes a laser light source having a light emitting region that emits elliptical laser light, and a condensing lens that condenses the laser light emitted from the laser light source.
- a homogenizer having a rectangular incident surface on the condensed light flux of the condenser lens, a spatial light modulation element for modulating laser light emitted from the homogenizer, and a laser modulated by the spatial light modulation element
- a projection lens for projecting light, the entrance surface of the homogenizer is rectangular, and the laser light source has a long axis direction of the light emitting region and a long side direction of the entrance surface of the homogenizer parallel to each other.
- the laser light source has a light emitting region that emits elliptical laser light, and the laser light emitted from the laser light source is condensed by the condenser lens.
- the homogenizer has a rectangular incident surface on the condensed light flux of the condenser lens.
- the laser light emitted from the homogenizer is modulated by the spatial light modulator, and the laser light modulated by the spatial light modulator. Is projected by the projection lens.
- the incident surface of the homogenizer is rectangular, and the laser light source is arranged so that the long axis direction of the light emitting region and the long side direction of the homogenizer incident surface are parallel to each other.
- the major axis direction of the light emitting region of the laser light source and the length of the entrance surface of the homogenizer Since the laser light source is arranged so that it is parallel to the side direction, the laser light emitted from the laser light source can be efficiently guided to the homogenizer, and the arrangement of the laser light source and the homogenizer is optimized to achieve miniaturization. And a high output light can be obtained from the homogenizer.
- the laser light source includes a plurality of semiconductor laser light sources, and the condensing lens condenses the laser light emitted from the plurality of semiconductor laser light sources at one point. It is preferable that a plurality of condensing lenses provided for each of a plurality of semiconductor laser light sources is included, and the homogenizer has a rectangular incident surface at a condensing point of the plurality of laser beams.
- the laser light source includes a plurality of semiconductor laser light sources, and the laser light emitted from the plurality of semiconductor laser light sources is a plurality of condensing lenses provided for each of the plurality of semiconductor laser light sources.
- a homogenizer having a rectangular incident surface is arranged at a condensing point of a plurality of laser beams. Therefore, since the laser beams emitted from the plurality of semiconductor lasers are condensed on the entrance surface of the homogenizer, it is possible to obtain light with a high output power on the exit surface of the homogenizer.
- the plurality of semiconductor laser light sources are arranged symmetrically with respect to the optical axis of the homogenizer. According to this configuration, since the plurality of semiconductor laser light sources are arranged axially symmetrically with respect to the optical axis of the homogenizer, the light quantity distribution of the light emitted from each semiconductor laser is axially symmetrical with each other, and the homogenizer emission The uniformity of the light quantity distribution at the end face can be improved.
- the laser light source includes a plurality of semiconductor laser light sources, and the condenser lens collimates the laser light emitted from the plurality of semiconductor laser light sources.
- a plurality of collimating lenses provided for each laser light source, a convex lens for condensing the laser light collimated by the collimating lens, and a concave lens provided between the convex lens and a condensing point of the convex lens;
- the homogenizer preferably has a rectangular incident surface at a condensing point of a combined lens composed of the convex lens and the concave lens.
- laser light emitted from a plurality of semiconductor laser light sources is converted into a plurality of half lasers. Collimated by a plurality of collimating lenses provided for each conductor laser light source, and collimated laser light is collected by a convex lens.
- the concave lens is provided between the convex lens and the condensing point of the convex lens, and a homogenizer having a rectangular incident surface is disposed at the condensing point of the combined lens composed of the convex lens and the concave lens.
- the distance between the convex lens and the concave lens is smaller than the focal length of the telephoto type combined lens composed of the convex lens and the concave lens, so the distance to each semiconductor laser light source power homogenizer can be shortened. And downsizing of the device can be realized.
- the laser light source emits a red laser light source that emits red laser light, a blue laser light source that emits blue laser light, and a green laser light.
- a green laser light source, the red laser light source and the blue laser light source are arranged so as to be axially symmetric with respect to the optical axis of the homogenizer, and the green laser light source is arranged on the optical axis of the homogenizer I prefer to be.
- the red laser light source that emits red laser light and the blue laser light source that emits blue laser light are arranged so as to be axially symmetric with respect to the optical axis of the homogenizer, A green laser light source that emits green laser light is disposed on the optical axis of the homogenizer. Therefore, since the spatial light modulator is irradiated with illumination light of the three primary colors, a full color image can be displayed.
- the plurality of condensing lenses may include a red condensing lens that condenses the red laser light emitted from the red laser light source at one point, and the blue laser light source.
- a blue condensing lens that condenses the emitted blue laser light at one point, and a green condensing lens that condenses the green laser light emitted from the green laser light source before entering the homogenizer The angle between the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light is the homogenizer at the condensing point of the red condensing lens or the blue condensing lens. It is preferable that the angle is the same as the angle formed between the optical axis of the dither and the red laser light or the blue laser light.
- the red laser beam emitted from the red laser light source is collected by the red condenser lens.
- One laser beam is collected at one point
- the blue laser beam emitted from the blue laser light source by the blue condenser lens is collected at one point
- the green laser beam emitted from the green laser light source by the green condenser lens Is collected before entering the homogenizer.
- the angle between the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light is equal to that of the homogenizer at the condensing point of the red condensing lens or the blue condensing lens.
- the angle is the same as the angle formed between the axis and the red laser beam or blue laser beam.
- the green laser light source is arranged on the optical axis of the homogenizer, the green laser light is incident on the homogenizer incident surface with a predetermined angle. It can be made uniform to the same extent as the light intensity distribution of the blue laser light, and the occurrence of color unevenness can be suppressed.
- the red laser light source and the blue laser light source include a semiconductor laser light source, and the green laser light source emits an excitation laser beam.
- a light source, a laser medium that is excited by laser light emitted from the pumping semiconductor laser light source, and a wavelength conversion element that emits green laser light by converting the wavelength of the laser light emitted from the laser medium force It is preferable to include
- red and blue laser beams are emitted from the semiconductor laser light source.
- excitation laser light is emitted from the excitation semiconductor laser light source
- the laser medium is excited by the emitted laser light
- the wavelength of the laser light emitted from the laser medium is changed by the wavelength conversion element.
- the green laser beam is emitted after conversion. Accordingly, since the red laser light source and the green laser light source that are more complex than the blue laser light source, which are semiconductor lasers, are arranged on the optical axis of the homogenizer, it is possible to reduce the size of the device.
- the plurality of semiconductor laser light sources may include a red semiconductor laser light source that emits red laser light and a blue semiconductor laser light source that emits blue laser light. preferable. According to this configuration, since the red laser light is emitted from the red semiconductor laser light source and the blue laser light is emitted from the blue semiconductor laser light source, red and blue light can be obtained from the homogenizer. [0085] In the projection display device, the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are different from each other, and laser light emitted from the red semiconductor laser light source is provided.
- the laser beam reaches the homogenizer are arranged either on the optical path until the laser beam reaches the homogenizer or on the optical path until the laser beam emitted from the blue semiconductor laser light source reaches the homogenizer. It is preferable to further include a half-wave plate for matching the planes of polarization of each other.
- the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are different from each other. Then, either on the optical path until the laser light emitted from the red semiconductor laser light source reaches the homogenizer or on the optical path until the laser light emitted from the blue semiconductor laser light source reaches the homogenizer, respectively.
- a half-wave plate is placed to match the polarization plane of the semiconductor laser light source.
- the plane of polarization of the laser light emitted from the red semiconductor laser light source and the plane of polarization of the laser light emitted from the blue semiconductor laser light source coincide with each other, so that the laser light incident on the spatial light modulation element
- the polarization plane can be made only in one direction, and the polarization plane of the incident-side polarizer of the spatial light modulator can be easily matched, so that the light use efficiency can be improved.
- the laser light source includes a semiconductor laser light source having a plurality of light-emitting regions arranged on a straight line, and the semiconductor laser light source includes the semiconductor laser light source. It is preferable that the light emitting regions are arranged so that the direction in which the plurality of light emitting regions are arranged is parallel to the long side direction of the entrance surface of the homogenizer.
- the semiconductor laser light source having a plurality of light emitting regions, each arranged on a straight line, the direction in which the plurality of light emitting regions are arranged and the long side direction of the entrance surface of the homogenizer are parallel to each other. It is arranged to become. Therefore, even in a semiconductor laser light source in which a plurality of light emitting regions are arranged in a straight line, the semiconductor laser light source is arranged so that the direction in which the plurality of light emitting regions are arranged and the long side direction of the homogenizer are parallel to each other. The maximum focused spot can be obtained within the range where the incident laser beam cannot be obtained.
- the laser light source may have a long axis length force of the laser beam on the entrance surface of the homogenizer. If the length of the light emitting region is longer than the length of the light emitting region, the long axis direction of the light emitting region and the long side direction of the incident surface of the homogenizer are preferably arranged in parallel.
- the long axis direction of the light emitting region and the long side of the entrance surface of the homogenizer Since the laser light source is arranged so as to be parallel to the direction, the laser light emitted from the laser light source can be efficiently guided to the homogenizer.
- the length of the long axis of the laser beam at the entrance surface of the homogenizer is shorter than the length of the short side of the homogenizer, the long axis direction of the light emitting region and the long side direction of the entrance surface of the homogenizer are parallel.
- the laser beam is guided to a homogenizer without being emitted. Therefore, if the length of the long axis of the laser beam on the entrance surface of the homogenizer is shorter than the length of the short side of the homogenizer, the long axis direction of the laser light source emission region is parallel to the long side direction of the homogenizer entrance surface.
- the laser light source and the homogenizer can be freely arranged.
- the laser light source includes a semiconductor laser light source having a plurality of light emitting regions arranged on a straight line, and the semiconductor laser light source includes It is preferable that the light emitting regions are arranged so that the direction in which the plurality of light emitting regions are arranged is parallel to the long side direction of the entrance surface of the homogenizer.
- the semiconductor laser light source having a plurality of light emitting regions, each arranged on a straight line, the direction in which the plurality of light emitting regions are arranged and the long side direction of the entrance surface of the homogenizer are parallel to each other. It is arranged to become. Therefore, even in a semiconductor laser light source in which a plurality of light emitting regions are arranged in a straight line, the semiconductor laser light source is arranged so that the direction in which the plurality of light emitting regions are aligned and the long side direction of the homogenizer are parallel to each other. The maximum focused spot can be obtained within the range where the incident laser beam cannot be obtained.
- the laser light source includes a plurality of semiconductor laser light sources, and the condenser lens collimates the laser light emitted from the plurality of semiconductor laser light sources.
- a convex lens for condensing the laser light collimated by the collimating lens, and a condensing point of the convex lens and the convex lens.
- the homogenizer preferably has a rectangular incident surface at a condensing point of a combined lens that is a force of the convex lens and the concave lens.
- the laser light emitted from the plurality of semiconductor laser light sources is collimated by the plurality of collimating lenses provided for each of the plurality of semiconductor laser light sources, and the collimated laser light is collected by the convex lens.
- the concave lens is provided between the convex lens and the condensing point of the convex lens, and a homogenizer having a rectangular incident surface is disposed at the condensing point of the combined lens composed of the convex lens and the concave lens.
- the distance between the convex lens and the concave lens is smaller than the focal length of the telephoto type combined lens composed of the convex lens and the concave lens, it is possible to shorten the distance to each semiconductor laser light source power homogenizer. And downsizing of the device can be realized.
- the laser light source includes a plurality of semiconductor laser light sources, and the condenser lens collimates the laser light emitted from the plurality of semiconductor laser light sources.
- a plurality of collimating lenses provided for each laser light source; a first convex lens for condensing the laser light collimated by the collimating lens; and the first convex lens with respect to a condensing point of the first convex lens.
- a second convex lens that relays the condensed laser light, and the homogenizer preferably has a rectangular incident surface at the condensing point of the second convex lens.
- the laser light emitted from the plurality of semiconductor laser light sources is collimated by the plurality of collimating lenses provided for each of the plurality of semiconductor laser light sources, and the collimated laser light is the first convex lens. It is condensed by. Then, the laser beam condensed on the first convex lens is relayed by the second convex lens provided on the opposite side of the first convex lens with respect to the condensing point of the first convex lens, and the second convex lens A homogenizer having a rectangular incident surface is arranged at the condensing point.
- the distance between the first convex lens and the second convex lens is smaller than the combined focal length of the telephoto type combination lens composed of the first convex lens and the second convex lens, While maintaining the angle between the outermost edge light incident on the homogenizer and the optical axis of the homogenizer, it is possible to increase the size of the semiconductor laser light source, that is, the aperture of the condenser lens. And high output light can be obtained from the homogenizer.
- the plurality of semiconductor laser light sources may include a red semiconductor laser light source that emits red laser light and a blue semiconductor laser light source that emits blue laser light. preferable. According to this configuration, since the red laser light is emitted from the red semiconductor laser light source and the blue laser light is emitted from the blue semiconductor laser light source, red and blue light can be obtained from the homogenizer.
- the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are different from each other, and laser light emitted from the red semiconductor laser light source is provided.
- laser light emitted from the red semiconductor laser light source is provided.
- the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are different from each other. Then, either on the optical path until the laser light emitted from the red semiconductor laser light source reaches the homogenizer or on the optical path until the laser light emitted from the blue semiconductor laser light source reaches the homogenizer, respectively.
- a half-wave plate is placed to match the polarization plane of the semiconductor laser light source.
- the plane of polarization of the laser light emitted from the red semiconductor laser light source and the plane of polarization of the laser light emitted from the blue semiconductor laser light source match, so that the laser light incident on the spatial light modulation element
- the polarization plane can be made only in one direction, and the polarization plane of the incident-side polarizer of the spatial light modulator can be easily matched, so that the light use efficiency can be improved.
- the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are parallel to each other.
- the red semiconductor laser light source and the blue semiconductor laser light source are arranged so that their polarization planes are parallel to each other, the polarization planes of the laser light incident on the spatial light modulator are made uniform.
- the polarization plane of the incident side polarizer of the spatial light modulator Can be easily combined, and the light use efficiency can be improved.
- the laser light source emits a red laser light source that emits red laser light, a blue laser light source that emits blue laser light, and a green laser light.
- a green laser light source, the red laser light source and the blue laser light source are arranged so as to be axially symmetric with respect to the optical axis of the homogenizer, and the green laser light source is arranged on the optical axis of the homogenizer I prefer to be.
- the red laser light source that emits red laser light and the blue laser light source that emits blue laser light are arranged so as to be axially symmetric with respect to the optical axis of the homogenizer, A green laser light source that emits green laser light is disposed on the optical axis of the homogenizer. Therefore, since the spatial light modulator is irradiated with illumination light of the three primary colors, a full color image can be displayed.
- the red laser light source and the blue laser light source include a semiconductor laser light source, and the green laser light source emits an excitation laser beam.
- a light source, a laser medium that is excited by laser light emitted from the pumping semiconductor laser light source, and a wavelength conversion element that emits green laser light by converting the wavelength of the laser light emitted from the laser medium force It is preferable to include
- the red and blue laser beams are emitted from the semiconductor laser light source.
- excitation laser light is emitted from the excitation semiconductor laser light source
- the laser medium is excited by the emitted laser light
- the wavelength of the laser light emitted from the laser medium is changed by the wavelength conversion element.
- the green laser beam is emitted after conversion. Accordingly, since the red laser light source and the green laser light source that are more complex than the blue laser light source, which are semiconductor lasers, are arranged on the optical axis of the homogenizer, it is possible to reduce the size of the device.
- the plurality of condensing lenses may include a red condensing lens that condenses the red laser light emitted from the red laser light source at a single point, and the blue laser light source.
- a blue condensing lens that condenses the emitted blue laser light at one point and the green laser light emitted from the green laser light source enter the homogenizer.
- the red laser light emitted from the red laser light source is collected at one point by the red condensing lens, and the blue laser light emitted from the blue laser light source by the blue condensing lens. Is condensed at one point, and the green laser light emitted from the green laser light source is collected by the green condenser lens before entering the homogenizer.
- the angle between the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light is equal to that of the homogenizer at the condensing point of the red condensing lens or the blue condensing lens. The angle is the same as the angle formed between the axis and the red laser beam or blue laser beam.
- the green laser light source is arranged on the optical axis of the homogenizer, the green laser light is incident on the entrance surface of the homogenizer with a predetermined angle. It can be made uniform to the same extent as the light intensity distribution of the blue laser light, and the occurrence of color unevenness can be suppressed.
- the laser light source emits the light emission when the long axis length force of the laser light on the entrance surface of the homogenizer is longer than the short side length of the homogenizer. It is preferable that the long axis direction of the region and the long side direction of the entrance surface of the homogenizer are parallel to each other.
- the long axis direction of the light emitting region and the long side of the entrance surface of the homogenizer Since the laser light source is arranged so as to be parallel to the direction, the laser light emitted from the laser light source can be efficiently guided to the homogenizer.
- the length of the long axis of the laser beam at the entrance surface of the homogenizer is shorter than the length of the short side of the homogenizer, the long axis direction of the light emitting region and the long side direction of the entrance surface of the homogenizer are parallel.
- the laser beam is guided to a homogenizer without being emitted. Therefore, the length force of the long axis of the laser beam at the entrance surface of the homogenizer.
- the laser light source and the homogenizer can be freely arranged without having to make the long axis direction of the light emitting region of the laser light source parallel to the long side direction of the entrance surface of the homogenizer. .
- a light source device includes a laser light source having a light emitting region for emitting elliptical laser light, a condensing lens for condensing the laser light emitted from the laser light source, A homogenizer having a rectangular incident surface on the condensed light flux of the condensing lens, the incident surface of the homogenizer is rectangular, and the laser light source includes a major axis direction of the light emitting region and a homogenizer. Arranged so that the long side direction of the incident surface is parallel.
- the laser light source has a light emitting region that emits elliptical laser light, and the laser light emitted from the laser light source is condensed by the condenser lens, and the collected light flux of the condenser lens
- a homogenizer having a rectangular entrance surface is disposed thereon.
- the entrance surface of the homogenizer is rectangular, and the laser light source is arranged so that the long axis direction of the light emitting region and the long side direction of the entrance surface of the homogenizer are parallel.
- the laser light source is arranged so that the long axis direction of the light emitting region of the laser light source is parallel to the long side direction of the entrance surface of the homogenizer, so that the laser light emitted from the laser light source can be efficiently homogenized.
- the arrangement of the laser light source and the homogenizer can be optimized to achieve downsizing, and high-power light can be obtained from the homogenizer.
- a projection display apparatus includes a plurality of laser light sources and a plurality of collectors provided for each of the plurality of laser light sources for condensing laser light emitted from the plurality of laser light sources.
- An optical lens a homogenizer having a rectangular entrance surface on the condensed light flux of the plurality of condenser lenses, a spatial light modulator for modulating laser light emitted from the homogenizer, and modulation by the spatial light modulator
- a plurality of laser light sources a red laser light source that emits red laser light, a blue laser light source that emits blue laser light, and a green laser light.
- the red laser light source and the blue laser light source are arranged so as to be axially symmetric with respect to the optical axis of the homogenizer.
- Sources, The plurality of condensing lenses are arranged on the optical axis of the homogenizer, the red condensing lens for condensing the red laser light emitted from the red laser light source on the entrance surface of the homogenizer, and the blue laser.
- a blue condensing lens that condenses the blue laser light emitted from the light source on the entrance surface of the homogenizer, and a green light that condenses the green laser light emitted from the green laser light source before entering the homogenizer.
- the angle between the optical axis of the homogenizer and the outermost edge of the green laser light at the condensing point of the green condensing lens is the red condensing lens or the blue condensing lens.
- the angle between the optical axis of the homogenizer and the red laser light or the blue laser light at the condensing point of the optical lens is the same.
- the laser light power emitted from the plurality of laser light sources is collected by the plurality of condensing lenses provided for each of the plurality of laser light sources.
- the homogenizer has a rectangular incident surface on the condensed light flux of a plurality of condensing lenses, and the laser light emitted from the homogenizer is modulated by the spatial light modulation element and is modulated by the spatial light modulation element.
- One light is projected by the projection lens.
- a red laser light source that emits red laser light and a blue laser light source that emits blue laser light are arranged so as to be axisymmetric with respect to the optical axis of the homogenizer, and emit green laser light.
- a green laser light source is disposed on the optical axis of the homogenizer.
- Red laser light emitted from the red laser light source is condensed at one point by the red condensing lens
- blue laser light emitted from the blue laser light source is condensed at one point by the blue condensing lens.
- the lens collects the green laser light emitted from the green laser light source before entering the homogenizer.
- the angle between the optical axis of the homogenizer at the condensing point of the green condensing lens and the outermost edge of the green laser light is the light of the homogenizer at the condensing point of the red condensing lens or the blue condensing lens. The angle is the same as the angle between the axis and the red or blue laser light.
- the apparatus can be downsized. Even if the green laser light source is arranged on the optical axis of the homogenizer, the green laser light is incident on the homogenizer incident surface at a predetermined angle. Therefore, the light quantity distribution of the green laser light can be made uniform to the same extent as the light quantity distributions of the red and blue laser lights, and the occurrence of color unevenness can be suppressed.
- the projection display device and the light source device according to the present invention can be miniaturized and can obtain high output light, and are useful as a front projector and a rear projector using a laser light source.
- using only the illumination optical system it can be applied to applications such as lighting devices and back panels of liquid crystal displays.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/293,668 US7988305B2 (en) | 2006-03-23 | 2007-03-22 | Projection type display device and light source device |
JP2008506331A JP4723637B2 (ja) | 2006-03-23 | 2007-03-22 | 投写型ディスプレイ装置及び光源装置 |
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JP2006080272 | 2006-03-23 | ||
JP2006-080272 | 2006-03-23 |
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PCT/JP2007/055857 WO2007108504A1 (ja) | 2006-03-23 | 2007-03-22 | 投写型ディスプレイ装置及び光源装置 |
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US (1) | US7988305B2 (ja) |
JP (1) | JP4723637B2 (ja) |
CN (1) | CN101405653A (ja) |
WO (1) | WO2007108504A1 (ja) |
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JP2015230378A (ja) * | 2014-06-04 | 2015-12-21 | シャープ株式会社 | 光学装置 |
US10057553B2 (en) | 2015-06-19 | 2018-08-21 | Seiko Epson Corporation | Light source device, illumination device, and projector |
KR101593963B1 (ko) * | 2015-07-30 | 2016-02-15 | 조남직 | 노광용 광원모듈 유닛 및 그 광원모듈 유닛이 구비된 노광장치 |
KR101649129B1 (ko) * | 2015-08-21 | 2016-08-18 | (주)블루코어 | 노광용 광원모듈 유닛 및 그 광원모듈 유닛이 구비된 노광장치 |
WO2017034221A1 (ko) * | 2015-08-21 | 2017-03-02 | 조남직 | 노광용 광원모듈 유닛 및 그 광원모듈 유닛이 구비된 노광장치 |
TWI608309B (zh) * | 2015-08-21 | 2017-12-11 | 趙南稙 | 曝光用光源模組單元及具備該光源模組單元的曝光裝置 |
JP2019124841A (ja) * | 2018-01-17 | 2019-07-25 | セイコーエプソン株式会社 | 照明装置およびプロジェクター |
JP7003678B2 (ja) | 2018-01-17 | 2022-01-20 | セイコーエプソン株式会社 | 照明装置およびプロジェクター |
WO2021145190A1 (ja) * | 2020-01-16 | 2021-07-22 | ソニーセミコンダクタソリューションズ株式会社 | 光源装置および電子機器 |
WO2021239970A3 (de) * | 2020-05-28 | 2022-01-27 | Schott Ag | Abbildungssystem umfassend strahlführungselement mit hoher solarisationsbeständigkeit im blauen spektralbereich |
Also Published As
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US20100231862A1 (en) | 2010-09-16 |
JP4723637B2 (ja) | 2011-07-13 |
US7988305B2 (en) | 2011-08-02 |
CN101405653A (zh) | 2009-04-08 |
JPWO2007108504A1 (ja) | 2009-08-06 |
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