CA2706975A1 - Diffuser for led light sources - Google Patents
Diffuser for led light sources Download PDFInfo
- Publication number
- CA2706975A1 CA2706975A1 CA2706975A CA2706975A CA2706975A1 CA 2706975 A1 CA2706975 A1 CA 2706975A1 CA 2706975 A CA2706975 A CA 2706975A CA 2706975 A CA2706975 A CA 2706975A CA 2706975 A1 CA2706975 A1 CA 2706975A1
- Authority
- CA
- Canada
- Prior art keywords
- led
- light source
- set forth
- led light
- filler material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000463 material Substances 0.000 claims abstract description 41
- 239000000945 filler Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims description 11
- -1 poly(acrylamide) Polymers 0.000 claims description 10
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 7
- 239000000499 gel Substances 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 239000010954 inorganic particle Substances 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000017 hydrogel Substances 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000009828 non-uniform distribution Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 5
- 238000005286 illumination Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005457 Black-body radiation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/04—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the light source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/06—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages the fastening being onto or by the lampholder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
- F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
An LED light source, which includes at least one LED, a panel between the LED and the light emission surface of the light source, and a filler material inside the panel containing a material to diffuse the light from the at least one LED by Mie scattering.
Description
DIFFUSER FOR LED LIGHT SOURCES
FIELD OF THE INVENTION
[0001] The present invention relates to providing uniformly dispersed light from a light emitting diode (LED) source and to the efficient removal of the heat generated by the LEDs, and more particularly, to the uniform dispersion of the light generated by LEDs in a light source without substantial light loss, in order to provide a uniform illumination surface, and to permit the LEDs to be run at higher power.
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0001] The present invention relates to providing uniformly dispersed light from a light emitting diode (LED) source and to the efficient removal of the heat generated by the LEDs, and more particularly, to the uniform dispersion of the light generated by LEDs in a light source without substantial light loss, in order to provide a uniform illumination surface, and to permit the LEDs to be run at higher power.
BACKGROUND OF THE INVENTION
[0002] An LED consists of a semiconductor junction, which emits light due to a current flowing through the junction. A white LED is typically made by using a blue or ultraviolet LED die, and adding a plastic coat to it, the coat containing a phosphor. The phosphor is used to convert the blue or ultraviolet light emitted by the LED die to a spectrum of light that more or less closely resembles white light or blackbody radiation.
[0003] At first sight, it would seem that white LEDs should make an excellent replacement for the traditional lighting sources. At equal power, they give far more light output than do incandescent bulbs, or, what is the same thing, they use much less power for equal light; and their operational life is orders of magnitude larger, namely, 10-100 thousand hours vs. 1-2 thousand hours. Similarly, their ultimate efficiency is higher than that of fluorescent tubes, and their lifetime is also substantially longer than that of fluorescent tubes.
[0004] However, LEDs have a number of drawbacks that have prevented them, so far, from being widely adopted as traditional lighting sources. One of these is that LEDs are discrete sources of light. They produce intense light within the beam of their output, but dim light outside of that beam. Using multiple LEDs does not fully alleviate this problem, as there are then interference patterns in the light.
[0005] In the past, LEDs have had diffusers added to their shells or bodies to spread out the light from the LED as a solution to the point light source problem.
Another method has been to roughen the surface of the LED package. Neither of these methods accomplishes uniform light distribution for an LED light source, and may lower luminous efficiency. Methods of accomplishing approximate angular uniformity may also involve partially absorptive processes, further lowering luminous efficacy.
Another method has been to roughen the surface of the LED package. Neither of these methods accomplishes uniform light distribution for an LED light source, and may lower luminous efficiency. Methods of accomplishing approximate angular uniformity may also involve partially absorptive processes, further lowering luminous efficacy.
[0006] Another drawback with LEDs is that although LEDs require substantially less power for a given light output than do incandescent bulbs, it still takes many watts to generate adequate light for illumination. An LED, being a semiconductor, is nearly a point source of heat, and cannot be allowed to get hotter than a range of approximately 85-150 C. The LED thus has a substantial heat problem.
[0007] One possible solution to this heat problem is to use a large metallic heat sink, attached to the LEDs. This heat sink would then extend out away from the bulb, removing the heat from the LEDs. However, this solution is undesirable, because the heat sink may make it difficult for the light source to fit in to the desired form factor.
SUMMARY OF THE INVENTION
SUMMARY OF THE INVENTION
[0008] This invention has the object of developing a diffuser for LEDs, such that the above-described primary problems are effectively solved. It aims at providing a diffuser that may be attached to an LED light source, the diffuser uniformly distributing the light over the surface of the light source with very little light loss, and also providing a large surface area for heat dissipation. The apparatus includes a sealed panel, preferentially formed of a plastic such as polycarbonate, and a filler material, preferentially formed of a fluid, plastic or gel. The fluid, gel or plastic is designed to either contain, or itself form, a system of Mie scatterers.
Additionally, the fluid, gel or plastic is designed to be, or to contain, material that efficiently removes heat from the LEDs and conveys it to a suitable surface for removal.
Additionally, the fluid, gel or plastic is designed to be, or to contain, material that efficiently removes heat from the LEDs and conveys it to a suitable surface for removal.
[0009] In accordance with one embodiment, the sealed panel has a rectangular cross-section. The fluid, gel or plastic fills the panel to approximately 70-99%, or as suitable to provide room for thermal expansion. The panel may be built as an integral part of the LED light source assembly, or may be an add-on attached by any of several well-known methods.
[0010] In accordance with another embodiment, the fluid, gel or plastic may be distributed in the sealed panel with a non-uniform spatial distribution. This may be used to generate light that is more intense in one direction than another.
BRIEF DESCRIPTION OF THE DRAWINGS
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
[0012] FIG. 1. is a view of a present state-of-the-art LED light source showing the reason for its directionality of light output.
[0013] FIG. 2 is a cross-sectional view of light emitted from an LED having Mie scattering from supra-wavelength particles.
[0014] FIG. 3 is a cross-sectional view of an LED light source showing the diffuser mounted in front of the LEDs.
[0015] FIG. 4 is a cross-sectional view of an LED light source showing a diffuser with non-uniform spatial distribution.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
[0017] According to the design characteristics, a detailed description of the current practice and preferred embodiments is given below.
[0018] FIG. 1 is a view of a present state-of-the-art LED light source 10 showing the reason for its directionality of light output and the construction used for removing heat. As shown in FIG. 1, the LEDs 20 are mounted on a circuit board 30.
Since said LEDs are point sources of light, the light emitted from the said LED light source appears concentrated in beams. Said circuit board provides electrical interconnects for the LEDs 20, and may also provide electrical isolation.
Wires 50 come from the circuit board to power the LEDs from a power source (not shown).
The circuit board 30 is mounted to a heatsink 40, made of a low thermal-resistivity material, whose purpose is to provide a low thermal-resistance path to the ambient for heat generated by the LEDs 20. In the drawing, heatsink 40 has fins 42 protruding from it, but any shape of heatsink may be used.
Since said LEDs are point sources of light, the light emitted from the said LED light source appears concentrated in beams. Said circuit board provides electrical interconnects for the LEDs 20, and may also provide electrical isolation.
Wires 50 come from the circuit board to power the LEDs from a power source (not shown).
The circuit board 30 is mounted to a heatsink 40, made of a low thermal-resistivity material, whose purpose is to provide a low thermal-resistance path to the ambient for heat generated by the LEDs 20. In the drawing, heatsink 40 has fins 42 protruding from it, but any shape of heatsink may be used.
[0019] FIG. 2 shows a cross-sectional view of light emitted from an LED having Mie scattering from a plurality of supra-wavelength particles 70 and an equal scattering of each of the wavelengths 80 according to a further embodiment.
Typically, the incoming light 60 will include a plurality of wavelength components, including a wavelength 62 based on the light-emitting material used within the LED.
For example, in a typical LED emission spectrum, the wavelength 62 emitted from the LED corresponding to the color blue will be approximately 410 to 450 rim.
As shown in FIG. 2, the incoming light 60 impinges on a dispersed set or plurality of particles 70 having an effective diameter 90, wherein the effective diameter 90 is greater than a dominant wavelength 62 of light emitted from the LED. The effective diameter 90 of the dispersed particles 70 are preferably a size one to a few times larger than a dominant wavelength 62 of the light emitting source. For example, for an LED producing a blue light, the dispersed set of particles 70 can be alumina trihydrate having a mean diameter of approximately 1.1 microns. It can be appreciated that any suitable particles having an effective diameter 90, which is greater than the dominant wavelength 62 of the emitting light source or LED
and creates Mie scattering can be used. It can be appreciated that the particles need not be spherical, or even approximately spherical, and that other shapes can be used such as disk or rod-shaped particles. This creates the condition for Mie scattering of the incoming light 60, wherein each of the incoming wavelengths 62 are scattered into an outgoing wavelength 80. The transmitted light or outgoing wavelengths are thus dispersed in directions relative to the incoming light 60, without significantly affecting the light intensity.
Typically, the incoming light 60 will include a plurality of wavelength components, including a wavelength 62 based on the light-emitting material used within the LED.
For example, in a typical LED emission spectrum, the wavelength 62 emitted from the LED corresponding to the color blue will be approximately 410 to 450 rim.
As shown in FIG. 2, the incoming light 60 impinges on a dispersed set or plurality of particles 70 having an effective diameter 90, wherein the effective diameter 90 is greater than a dominant wavelength 62 of light emitted from the LED. The effective diameter 90 of the dispersed particles 70 are preferably a size one to a few times larger than a dominant wavelength 62 of the light emitting source. For example, for an LED producing a blue light, the dispersed set of particles 70 can be alumina trihydrate having a mean diameter of approximately 1.1 microns. It can be appreciated that any suitable particles having an effective diameter 90, which is greater than the dominant wavelength 62 of the emitting light source or LED
and creates Mie scattering can be used. It can be appreciated that the particles need not be spherical, or even approximately spherical, and that other shapes can be used such as disk or rod-shaped particles. This creates the condition for Mie scattering of the incoming light 60, wherein each of the incoming wavelengths 62 are scattered into an outgoing wavelength 80. The transmitted light or outgoing wavelengths are thus dispersed in directions relative to the incoming light 60, without significantly affecting the light intensity.
[0020] FIG. 3 is a cross-sectional view of an LED light source 10 showing the diffuser 90 mounted in front of the LEDs. As shown in Figure 3, the LEDs 20 are mounted on a circuit board 30, and have power wires 50 coming off to their power source, not shown. Placed in front of said LEDs is the diffuser panel 90. Said diffuser panel is shown as being form-fitted to the LEDs 20 and circuit board 30, providing a low-thermal resistance path for the heat both of said LEDs and for the heat of said LEDs being transferred to said circuit board. The heat conducted by the diffuser panel 90 may be transferred to ambient by conduction and radiation from the emitting surface 92. The diffuser panel 90 also spreads out the light from the LEDs 20, producing an approximately uniform light output on the emitting surface 92. It can be appreciated that the diffuser panel 90 need not be rectangular in cross-section, and that other shapes such as disk can be used. It can also be appreciated that the diffuser panel 90 need not have a flat emitting surface, and that other shapes such as hemispherical can be used. It can also be appreciated that the diffuser panel 90 need not be form-fitted to the LEDs 20, but may simply be placed in front of them.
[0021] As shown in FIG. 3, the LED light source 10 includes at least one LED, a panel 90 between the at least one LED 20 and a light emission surface of the light source, and a filler material 91 inside the panel 90 to scatter the light from the at least one LED 20. In accordance with one embodiment, the filler material 91 is a poly(acrylamide) hydrogel having a plurality of particles, which have been lightly coated with inorganic particles, such as calcium carbonate.
[0022] In accordance with another embodiment, the LED light source 10 includes at least one LED 20, a panel between the at least one LED 20 and a light emission surface of the light source 10, and a filler material 91 inside the panel 90 to scatter the light from the at least one LED 20, wherein the filler material 91 contains small Mie cells plus a second different density component. In accordance with an embodiment, the filler material 91 is comprised of a hydrocarbon-based oil, with said second different density component being composed of water and a small amount of a surfactant. It can be appreciated that the filler material 91 is composed of components that are individually each transparent to light.
[0023] FIG. 4 is a cross-sectional view of an LED light source, not shown, showing a diffuser 90 with non-uniform spatial distribution. As shown in Figure 4, the diffuser 90 has two rectangular areas 94 in which the density of the fluid, gel or plastic filler material is lower than in the other areas 96 of said diffuser 90. The lower density filler material areas 94 may be formed with discrete boxes formed within the diffuser 90, or may simply be modulation in the density of the material used. The effect of the lower density filler material areas 94 is to produce light from those areas that is more direct and intense than in the other areas 96 of the diffuser 90. The other areas 96 produce a more diffuse and less intense light. It can be appreciated that the lower density filler material areas 94 need not be rectangular, and may be of other shapes such as circles and annuli. It can also be appreciated that the filler material may be of uniform density, and only the Mie scatterers may be varied in density.
[0024] It will be apparent to those skilled in the art that various modifications and variation can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Claims (25)
1. An LED light source comprising:
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel containing a material to diffuse the light from the at least one LED by Mie scattering.
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel containing a material to diffuse the light from the at least one LED by Mie scattering.
2. An LED light source as set forth in Claim 1, wherein the filler material is a fluid.
3. An LED light source as set forth in Claim 1, wherein the filler material is a gel.
4. An LED light source as set forth in Claim 1, wherein the filler material is a plastic.
5. An LED light source as set forth in Claim 1, wherein the filler material diffuses the light by Mie scattering.
6. An LED light source as set forth in Claim 1, wherein the filler material is thermally conductive.
7. An LED light source as set forth in Claim 1, wherein the filler material is uniformly distributed throughout the panel.
8. An LED light source as set forth in Claim 1, wherein the Mie scatterers are uniformly distributed throughout the panel.
9. An LED light source as set forth in Claim 1, wherein the filler material has a non-uniform distribution throughout the panel.
10. An LED light source as set forth in Claim 1, wherein the Mie scatterers have a non-uniform distribution throughout the panel.
11. An LED light source as set forth in Claim 1, wherein the at least one LED is a blue or ultraviolet LED without a phosphor, and the panel contains at least one phosphor.
12. An LED light source as set forth in Claim 1, wherein the panel is sealed.
13. An LED light source as set forth in Claim 1, wherein the panel is molded to form fit the LEDs.
14. An LED light source as set forth in Claim 1, wherein the filler material does not entirely fill the panel.
15. An LED light source as set forth in Claim 1, wherein the filler material is a hydrogel.
16. An LED light source comprising:
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel to scatter the light from the at least one LED
said filler material, and wherein the filler material is a poly(acrylamide) hydrogel.
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel to scatter the light from the at least one LED
said filler material, and wherein the filler material is a poly(acrylamide) hydrogel.
17. An LED light source as set forth in Claim 16, wherein said poly(acrylamide) includes a plurality of particles, which have been lightly coated with inorganic particles.
18. An LED light source as set forth in Claim 17, wherein the inorganic particles are calcium carbonate.
19. An LED light source comprising:
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel to scatter the light from the at least one LED, said filler material containing small Mie cells plus a second different density component, wherein said filler material is comprised of a hydrocarbon-based oil, with said second different density component being composed of water and a small amount of a surfactant.
at least one LED;
a panel between the at least one LED and a light emission surface of the light source; and a filler material inside the panel to scatter the light from the at least one LED, said filler material containing small Mie cells plus a second different density component, wherein said filler material is comprised of a hydrocarbon-based oil, with said second different density component being composed of water and a small amount of a surfactant.
20. An LED light source as set forth in Claim 19, wherein said filler material is composed of components that are individually each transparent to light.
21. An LED light source comprising:
at least one LED; and a material to scatter light from the at least one LED, wherein the material is a poly(acrylamide) hydrogel.
at least one LED; and a material to scatter light from the at least one LED, wherein the material is a poly(acrylamide) hydrogel.
22 An LED light source as set forth in Claim 21, wherein said poly(acrylamide) includes a plurality of particles, which have been lightly coated with inorganic particles.
23. An LED light source as set forth in Claim 22, wherein the inorganic particles are calcium carbonate.
24. An LED light source comprising:
at least one LED; and a material to scatter the light from the at least one LED, said material containing small Mie cells plus a second different density component.
at least one LED; and a material to scatter the light from the at least one LED, said material containing small Mie cells plus a second different density component.
25. An LED light source as set forth in Claim 24, wherein said material is comprised of a hydrocarbon-based oil, with said second different density component being composed of water and a small amount of a surfactant.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US98231407P | 2007-10-24 | 2007-10-24 | |
US60/982,314 | 2007-10-24 | ||
PCT/US2008/011984 WO2009054948A1 (en) | 2007-10-24 | 2008-10-21 | Diffuser for led light sources |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2706975A1 true CA2706975A1 (en) | 2009-04-30 |
Family
ID=40579834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2706975A Abandoned CA2706975A1 (en) | 2007-10-24 | 2008-10-21 | Diffuser for led light sources |
Country Status (7)
Country | Link |
---|---|
US (2) | US8415695B2 (en) |
EP (1) | EP2215403A4 (en) |
JP (1) | JP2011501464A (en) |
KR (1) | KR20100110770A (en) |
CN (2) | CN101896766B (en) |
CA (1) | CA2706975A1 (en) |
WO (1) | WO2009054948A1 (en) |
Families Citing this family (24)
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BRPI0711151A2 (en) | 2006-05-02 | 2011-08-23 | Superbulbs Inc | light scattering method and preferential scattering of certain light wavelengths for light-emitting diodes and bulbs constructed thereon |
CA2645353A1 (en) | 2006-05-02 | 2007-11-15 | Superbulbs, Inc. | Plastic led bulb |
WO2009035693A1 (en) | 2007-09-14 | 2009-03-19 | Superbulbs, Inc. | Phosphor-containing led light bulb |
CN101896766B (en) | 2007-10-24 | 2014-04-23 | 开关电灯公司 | Diffuser for LED light sources |
JP5537068B2 (en) * | 2008-05-09 | 2014-07-02 | 康博 小池 | LED optical elements |
US8471445B2 (en) | 2008-08-18 | 2013-06-25 | Switch Bulb Company, Inc. | Anti-reflective coatings for light bulbs |
JP4717148B1 (en) * | 2010-05-28 | 2011-07-06 | 株式会社スズデン | Lighting apparatus and method of manufacturing the lighting apparatus |
CN102073145A (en) * | 2011-01-29 | 2011-05-25 | 中北大学 | Speckle elimination device based on Mie scattering and Brownian motion |
CN102073146B (en) * | 2011-01-29 | 2012-07-04 | 中北大学 | Mie scattering and field-induced deformation polymers-based speckle eliminating device |
JP5827578B2 (en) * | 2011-02-14 | 2015-12-02 | 株式会社半導体エネルギー研究所 | Method for producing optical element |
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WO2009054948A1 (en) | 2009-04-30 |
US8415695B2 (en) | 2013-04-09 |
EP2215403A4 (en) | 2012-08-29 |
CN101896766A (en) | 2010-11-24 |
US8981405B2 (en) | 2015-03-17 |
CN101896766B (en) | 2014-04-23 |
US20110042700A1 (en) | 2011-02-24 |
EP2215403A1 (en) | 2010-08-11 |
JP2011501464A (en) | 2011-01-06 |
US20130214313A1 (en) | 2013-08-22 |
CN103925559A (en) | 2014-07-16 |
KR20100110770A (en) | 2010-10-13 |
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