USRE35534E - Fresnel lens with aspheric grooves - Google Patents

Fresnel lens with aspheric grooves Download PDF

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Publication number
USRE35534E
USRE35534E US08/228,115 US22811594A USRE35534E US RE35534 E USRE35534 E US RE35534E US 22811594 A US22811594 A US 22811594A US RE35534 E USRE35534 E US RE35534E
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grooves
lens
fresnel lens
groove
fresnel
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US08/228,115
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Richard N. Claytor
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Fresnel Tech Inc
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Fresnel Tech Inc
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Definitions

  • This invention relates in general to the field of optics, and more particularly to Fresnel lenses.
  • Count Buffon proposed to grind out of a solid piece of glass a lens in steps or concentric zones, in order to reduce the thickness of the lens to a minimum.
  • Fresnel lenses are used as light condensers, illuminators, and magnifiers, and in many other ways.
  • Fresnel lenses basically consist of a series of concentric prismatic grooves, designed to cooperatively direct incident light rays to a common focus.
  • This type of lens is thin, lightweight, and of high aperture. Also, this type of lens can be accurately mass-produced using replication techniques.
  • the grooves are all the same width, so that the groove density is constant across the lens.
  • the depth of the grooves increases as the distance between the groove and the center of the lens increases.
  • the depth of the deepest groove places a limit on the minimum thickness of the lens. Therefore, if the depth of the grooves can be reduced, the thickness of the lens can be reduced.
  • One method of reducing groove depth is to increase groove density i.e., the number of grooves between the center of the lens and a given radius.
  • diffraction effects limits the improvements which can be made in this way. Diffraction effects are especially strong in Fresnel lenses for infrared wavelengths, because the wavelength approaches the groove spacing.
  • Fresnel lenses are particularly useful with infrared energy rays. Such infrared rays are used in passive infrared burglar alarms, noncontacting thermometers, proximity detectors, and other devices. Lenses for collecting such infrared rays can be made of rather perfect, but expensive materials, such as germanium, but a desire to reduce costs often dictates cheaper, lossy materials, such as plastics. Lenses made from such materials must be very thin, or too much of the incident energy will be attenuated in passing through the lens. The shape of a conventional positive focal length lens is such that the center, the most ideal portion optically, is also the thickest portion. The Fresnel lens concept allows lenses to be made very thin, and adequately uniform in thickness from center to edge.
  • the Fresnel lens of the invention has a body with a grooved surface.
  • the grooved surface has a plurality of grooves, which all extend to the same depth.
  • Each groove surface has an aspheric contour, and all of the grooves together approximate an aspheric surface, as well.
  • the distances between successive grooves vary, so that the groove density varies across the lens. Since all of the grooves extend to the same depth, the lens can be made very thin, while still retaining a reasonably large groove density, and hence an acceptable level of losses due to diffraction effects, especially toward the optical center of the lens.
  • Plastic materials best suited for use in the infrared are poor lens materials. Hovever, because the Fresnel lens of the invention can be made very thin, yet retain other desirable characteristics in the infrared, such as complete elimination of spherical aberration and an acceptable level of diffraction effects, the use of the lossy plastic materials in the infrared became practical.
  • the present method of making the Fresnel lens of the invention or the molds to produce the Fresnel lens of the invention requires a process in which the point of a sharply pointed cutting tool is used to cut the surface. Because of the requirement for extremely small grooves which results from the need to make the lens thin, the cutting tool must be sharp indeed, with a radius of perhaps 0.0001 inch. Contoured surfaces produced in this manner inevitably have a poor surface finish because of tool marks, and are not acceptable for visible light applications. However, for infrared applications the surface finish of the lens is far less critical.
  • the grooves in the lens of the invention have aspherical surfaces.
  • the exact contour of the groove surfaces is determined by the particular application of the lens.
  • FIG. 1 is a plan view of a prior art Fresnel lens.
  • FIG. 2 is a sectional view of a prior art Fresnel lens, as seen along lines II--II in FIG. 1.
  • FIG. 3 is a plan view of a Fresnel lens according to the invention.
  • FIG. 4 is a sectional view of a Fresnel lens according to the invention, as seen along line IV--IV in FIG. 3.
  • FIG. 5 is a sectional view of a Fresnel lens.
  • FIG. 6 is a graphic representation of a spherical curve and an aspherical curve.
  • FIGS. 1 and 2 A prior art Fresnel lens 11 is shown in FIGS. 1 and 2.
  • the lens 11 has a thin circular body 13.
  • One surface 15 of the body 13 is flat.
  • the other surface 17 has a plurality of concentric grooves 19.
  • Other types of prior art lenses have grooves on both sides.
  • Each groove 19 is triangular in cross section, as shown in FIG. 2.
  • Each groove 19 has a side 21, which extends from the surface 17 of the lens 11 to an innermost point 23.
  • Each groove 19 also has a surface 25, which angles from the innermost point 23 of the groove 19 to the surface 17 of the lens 11.
  • the outermost point 27 of the surface 25 of each groove 19 coincides with the outermost point 27 of the vertical side 21 of the next groove 19.
  • the surfaces 25 may be flat, thus forming frusto-conical surfaces, but other shapes may also be used.
  • each groove 19 which is the horizontal distance between the each pair of successive vertical sides 21, is constant.
  • the depth of each groove 19, which is the length of the vertical side 21, increases as the distance between the vertical side 21 and the center 29 of the lens 11 increases. Therefore, the grooves 19 which are closer to the center 29 of the lens 11 are shallower than the grooves 19 which are closer to the circumference 31 of the lens 11.
  • each groove surface 25 was very important.
  • the groove was therefore cut with the flat surface of a highly-polished diamond cutting tool, to minimize and average out tool marks. Even when spherically contoured groove surfaces 25 were made, they were made with a speciallly formed diamond tool with a curved cutting edge.
  • Fresnel lenses for infrared applications were made using molds cut for visible light applications.
  • the lens 33 of the invention is shown in FIGS. 3 and 4.
  • This lens 33 is preferably made of an infrared-transmitting plastic, such as polyethylene, and has a thin circular body 35, with a flat surface 37 and a grooved surface 39.
  • the grooves 41 are of a constant depth and a varying width.
  • the width of each groove 41 which is the horizontal distance between each pair of successive vertical sides 42, decreases as the distance between the groove 41 and the center 43 of the lens 33 increases.
  • the grooves 41 nearer the center 43 of the lens 33 are wide than the grooves 41 nearer the circumference 45 of the lens 33.
  • each groove 41 is contoured, rather than flat.
  • One method of describing the contours of the grooves is derived from the representation of the Fresnel lens as a conventional continuous surface lens that has been collapsed to a thin element of relatively uniform thickness, as shown in FIG. 5.
  • the contour of each groove 41 is roughly equal to the contour of the section 49 of the continuous surface 51 directly above groove 41.
  • FIG. 6 plots "sag" on the z-axis, which is the optic axis 53 in FIG. 5, as a function of the distance across the lens 33, which is plotted on the y-axis.
  • the difference between the spherical curve 57 and an aspherical curve 55 is shown in FIG. 6.
  • the profile of a continuous aspheric surface 51 can often be closely described by the standard equation of a conic, axially symmetric about the z-axis. That equation is: ##EQU1## where Z and Y are the coordinates of the surface, C is the vertex curvature, and K is the conic constant.
  • the vertex curvature and the conic constant can be chosen depending upon the desired characteristics of the lens, and the contours of each groove can be figured using this equation. The particular vertex curvature and conic constant will depend upon several factors, such as the desired focal length and the index of refraction, and the application in which the lens will be used.
  • the concept of the Fresnel lens allows an aspherical lens to be made very thin.
  • the grooves 47 in a Fresnel lens 33 introduce a scattering effect and refract some of the rays in undesired directions. Therefore, it is preferable that the grooves 47 near the center 43 of the lens 33 be as large as possible.
  • the Fresnel lens of the invention has several advantages over the prior art. Since the grooves are all the same depth, the thickness of the lens is minimized. This makes it possible to make lenses for infrared applications out of a relatively inexpensive, infrared-transmitting material, such as polyethylene.
  • the method presently used to produce the contoured aspheric surface uses a pointed diamond tool.
  • Typical grooves toward the outer edge of the Fresnel lens of the invention may have a depth of 0.005 inch and a width of 0.003 inch.
  • the diamond tool In order to contour such a groove faithfully, the diamond tool must have a point radius of 0.0001 inch or so. Countouring with a point this small will inevitably result in tool marks which render the surface quality of the Fresnel lens of the invention unacceptable for visible light applications.
  • the Fresnel lens of the invention is acceptable for infrared use, for example in the range of 8 to 14 micrometer wavelength, where surface finish is not so critical.
  • the required image quality does not require complete faithfulness to the chosen aspheric contour for all of the grooves, specifically, those toward the outer edge of the lens.
  • the groove width decreases, and the difference between the aspheric contour and a spherical contour (or the frustum of cone, for that matter) becomes smaller.
  • the difference may have a sufficiently trivial impact on image quality as to render the aspheric contour irrelevant.
  • the groove contour need not be aspherical. In all cases, however, a substantial portion of the grooves will each individually have an aspherical contour.
  • the contour of each groove differs from the contour of the other grooves.
  • the invention thus results in a reduction in aberration, attenuation, diffraction, and scattering in infrared energy rays over that of Fresnel lenses of the prior art.
  • the preferred embodiment of the invention will not be a circular lens.
  • the grooves will be circular, but the lens will be rectangular.
  • the innermost of the concentric grooves may not be located in the center of the lens.
  • the basic theory of the invention may also be applied to linear or line focus lenses. In a linear lens, the grooves would be acylindrical, and all of the grooves together approximate an acylindrical surface, rather than cylindrical as in the prior art.

Abstract

A Fresnel lens formed of an infrared transmitting material has a grooved surface. The grooves all extend to the same depth, and the distances between successive grooves vary across the lens. In a circular lens, the grooves are concentric, and the distances between grooves nearer the center are longer than the distances between the grooves nearer the circumference. A substantial portion of the grooves have an aspherical surface.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to the field of optics, and more particularly to Fresnel lenses.
2. Description of the Prior Art
In 1748, Count Buffon proposed to grind out of a solid piece of glass a lens in steps or concentric zones, in order to reduce the thickness of the lens to a minimum. In 1822, Augustin Fresnel, for whom the Fresnel lens is named, constructed a lens in which the centers of curvature of the different rings receded from the axis according to their distances from the center, so as to practically eliminate spherical aberration.
Modern Fresnel lenses are used as light condensers, illuminators, and magnifiers, and in many other ways. Fresnel lenses basically consist of a series of concentric prismatic grooves, designed to cooperatively direct incident light rays to a common focus. This type of lens is thin, lightweight, and of high aperture. Also, this type of lens can be accurately mass-produced using replication techniques.
Generally, in prior art thin Fresnel lenses intended for visible light applications, the grooves are all the same width, so that the groove density is constant across the lens. The depth of the grooves increases as the distance between the groove and the center of the lens increases. The depth of the deepest groove places a limit on the minimum thickness of the lens. Therefore, if the depth of the grooves can be reduced, the thickness of the lens can be reduced.
One method of reducing groove depth is to increase groove density i.e., the number of grooves between the center of the lens and a given radius. However, diffraction effects limits the improvements which can be made in this way. Diffraction effects are especially strong in Fresnel lenses for infrared wavelengths, because the wavelength approaches the groove spacing.
Fresnel lenses are particularly useful with infrared energy rays. Such infrared rays are used in passive infrared burglar alarms, noncontacting thermometers, proximity detectors, and other devices. Lenses for collecting such infrared rays can be made of rather perfect, but expensive materials, such as germanium, but a desire to reduce costs often dictates cheaper, lossy materials, such as plastics. Lenses made from such materials must be very thin, or too much of the incident energy will be attenuated in passing through the lens. The shape of a conventional positive focal length lens is such that the center, the most ideal portion optically, is also the thickest portion. The Fresnel lens concept allows lenses to be made very thin, and adequately uniform in thickness from center to edge.
SUMMARY OF THE INVENTION
The Fresnel lens of the invention has a body with a grooved surface. The grooved surface has a plurality of grooves, which all extend to the same depth. Each groove surface has an aspheric contour, and all of the grooves together approximate an aspheric surface, as well. The distances between successive grooves vary, so that the groove density varies across the lens. Since all of the grooves extend to the same depth, the lens can be made very thin, while still retaining a reasonably large groove density, and hence an acceptable level of losses due to diffraction effects, especially toward the optical center of the lens.
Plastic materials best suited for use in the infrared, such as polyethylene, are poor lens materials. Hovever, because the Fresnel lens of the invention can be made very thin, yet retain other desirable characteristics in the infrared, such as complete elimination of spherical aberration and an acceptable level of diffraction effects, the use of the lossy plastic materials in the infrared became practical.
The present method of making the Fresnel lens of the invention or the molds to produce the Fresnel lens of the invention requires a process in which the point of a sharply pointed cutting tool is used to cut the surface. Because of the requirement for extremely small grooves which results from the need to make the lens thin, the cutting tool must be sharp indeed, with a radius of perhaps 0.0001 inch. Contoured surfaces produced in this manner inevitably have a poor surface finish because of tool marks, and are not acceptable for visible light applications. However, for infrared applications the surface finish of the lens is far less critical.
The grooves in the lens of the invention have aspherical surfaces. The exact contour of the groove surfaces is determined by the particular application of the lens.
DESCRIPTION OF THE DRAWING
FIG. 1 is a plan view of a prior art Fresnel lens.
FIG. 2 is a sectional view of a prior art Fresnel lens, as seen along lines II--II in FIG. 1.
FIG. 3 is a plan view of a Fresnel lens according to the invention.
FIG. 4 is a sectional view of a Fresnel lens according to the invention, as seen along line IV--IV in FIG. 3.
FIG. 5 is a sectional view of a Fresnel lens.
FIG. 6 is a graphic representation of a spherical curve and an aspherical curve.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A prior art Fresnel lens 11 is shown in FIGS. 1 and 2. The lens 11 has a thin circular body 13. One surface 15 of the body 13 is flat. The other surface 17 has a plurality of concentric grooves 19. Other types of prior art lenses have grooves on both sides.
Each groove 19 is triangular in cross section, as shown in FIG. 2. Each groove 19 has a side 21, which extends from the surface 17 of the lens 11 to an innermost point 23. Each groove 19 also has a surface 25, which angles from the innermost point 23 of the groove 19 to the surface 17 of the lens 11. The outermost point 27 of the surface 25 of each groove 19 coincides with the outermost point 27 of the vertical side 21 of the next groove 19. The surfaces 25 may be flat, thus forming frusto-conical surfaces, but other shapes may also be used.
The width of each groove 19, which is the horizontal distance between the each pair of successive vertical sides 21, is constant. The depth of each groove 19, which is the length of the vertical side 21, increases as the distance between the vertical side 21 and the center 29 of the lens 11 increases. Therefore, the grooves 19 which are closer to the center 29 of the lens 11 are shallower than the grooves 19 which are closer to the circumference 31 of the lens 11.
Since thin prior art Fresnel lenses were specifically made for visible light applications, the surface finish of each groove surface 25 was very important. The groove was therefore cut with the flat surface of a highly-polished diamond cutting tool, to minimize and average out tool marks. Even when spherically contoured groove surfaces 25 were made, they were made with a speciallly formed diamond tool with a curved cutting edge. Furthermore, in the prior art, Fresnel lenses for infrared applications were made using molds cut for visible light applications.
The lens 33 of the invention is shown in FIGS. 3 and 4. This lens 33 is preferably made of an infrared-transmitting plastic, such as polyethylene, and has a thin circular body 35, with a flat surface 37 and a grooved surface 39. However, the grooves 41 are of a constant depth and a varying width. The width of each groove 41, which is the horizontal distance between each pair of successive vertical sides 42, decreases as the distance between the groove 41 and the center 43 of the lens 33 increases. Thus, the grooves 41 nearer the center 43 of the lens 33 are wide than the grooves 41 nearer the circumference 45 of the lens 33.
The surface 47 of each groove 41 is contoured, rather than flat. One method of describing the contours of the grooves is derived from the representation of the Fresnel lens as a conventional continuous surface lens that has been collapsed to a thin element of relatively uniform thickness, as shown in FIG. 5. The contour of each groove 41 is roughly equal to the contour of the section 49 of the continuous surface 51 directly above groove 41. There is a correction, which can be substantial, to account for the distance the lens surface corresponding to each groove is moved either toward or away from the focus. There may also be a slight correction caused by the thickness of the Fresnel lens; it is similar to the same correction applied to conventional lenses, but modified slightly because of the shorter path through the lens.
It is known in the art that a spherical surface on a lens will produce spherical aberration. Therefore, the continuous surface from which the contours of the grooves are determined should not be spherical, but aspherical. FIG. 6 plots "sag" on the z-axis, which is the optic axis 53 in FIG. 5, as a function of the distance across the lens 33, which is plotted on the y-axis. The difference between the spherical curve 57 and an aspherical curve 55 is shown in FIG. 6.
The profile of a continuous aspheric surface 51 can often be closely described by the standard equation of a conic, axially symmetric about the z-axis. That equation is: ##EQU1## where Z and Y are the coordinates of the surface, C is the vertex curvature, and K is the conic constant. The vertex curvature and the conic constant can be chosen depending upon the desired characteristics of the lens, and the contours of each groove can be figured using this equation. The particular vertex curvature and conic constant will depend upon several factors, such as the desired focal length and the index of refraction, and the application in which the lens will be used.
The concept of the Fresnel lens allows an aspherical lens to be made very thin. However, the grooves 47 in a Fresnel lens 33 introduce a scattering effect and refract some of the rays in undesired directions. Therefore, it is preferable that the grooves 47 near the center 43 of the lens 33 be as large as possible.
The Fresnel lens of the invention has several advantages over the prior art. Since the grooves are all the same depth, the thickness of the lens is minimized. This makes it possible to make lenses for infrared applications out of a relatively inexpensive, infrared-transmitting material, such as polyethylene.
The method presently used to produce the contoured aspheric surface uses a pointed diamond tool. Typical grooves toward the outer edge of the Fresnel lens of the invention may have a depth of 0.005 inch and a width of 0.003 inch. In order to contour such a groove faithfully, the diamond tool must have a point radius of 0.0001 inch or so. Countouring with a point this small will inevitably result in tool marks which render the surface quality of the Fresnel lens of the invention unacceptable for visible light applications. However, the Fresnel lens of the invention is acceptable for infrared use, for example in the range of 8 to 14 micrometer wavelength, where surface finish is not so critical.
There may be circumstances in which the required image quality does not require complete faithfulness to the chosen aspheric contour for all of the grooves, specifically, those toward the outer edge of the lens. As the distance from the lens center increases, the groove width decreases, and the difference between the aspheric contour and a spherical contour (or the frustum of cone, for that matter) becomes smaller. At some point, the difference may have a sufficiently trivial impact on image quality as to render the aspheric contour irrelevant. At and beyond this point, the groove contour need not be aspherical. In all cases, however, a substantial portion of the grooves will each individually have an aspherical contour. The contour of each groove differs from the contour of the other grooves.
The invention thus results in a reduction in aberration, attenuation, diffraction, and scattering in infrared energy rays over that of Fresnel lenses of the prior art.
The invention has been shown only in its preferred embodiment. It should be apparent to those skilled in the art that the invention is not so limited, but is susceptible to various changes and modifications without departing from the spirit thereof.
In some applications, the preferred embodiment of the invention will not be a circular lens. For some applications the grooves will be circular, but the lens will be rectangular. Also, the innermost of the concentric grooves may not be located in the center of the lens. The basic theory of the invention may also be applied to linear or line focus lenses. In a linear lens, the grooves would be acylindrical, and all of the grooves together approximate an acylindrical surface, rather than cylindrical as in the prior art.

Claims (3)

I claim:
1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, .Iadd.in the wavelength range from 8 to 14 micrometers, .Iaddend.the lens comprising:
a body, having a grooves surface;
the grooves surface having a plurality of grooves, which extend to the same depth;
the grooves being of different widths; and
a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
2. A Fresnel lens formed of a material capable of transmitting infrared energy rays, .Iadd.in the wavelength range from 8 to 14 micrometers, .Iaddend.the lens comprising:
a body, having a substantially flat grooved surface;
the grooved surface having a plurality of grooves, each of which extend to the same depth;
the grooves being of different widths; and
a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves. .Iadd.3. The Fresnel lens according to claim 1 wherein the material of the lens is a plastic. .Iaddend..Iadd.4. The Fresnel lens according to claim 1 wherein the material of the lens is
polyethylene. .Iaddend..Iadd.5. A Fresnel lens, comprising in combination:
A body formed of a polyethylene material capable of transmitting infrared energy rays in the wavelength range from 8 to 14 micrometers, the body having a grooved surface;
the grooved surface having a plurality of grooves which extend to the same depth;
the grooves being of different widths; and
a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surface of the other grooves. .Iaddend.
US08/228,115 1986-04-10 1994-04-15 Fresnel lens with aspheric grooves Expired - Lifetime USRE35534E (en)

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US06/850,256 US4787722A (en) 1986-04-10 1986-04-10 Fresnel lens with aspiteric grooves
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1006399A2 (en) * 1998-12-02 2000-06-07 Kuraray Co., Ltd. Fresnel lens sheet
US6348684B1 (en) 1999-03-25 2002-02-19 Lucent Technologies Inc. Receiving system for free-space optical communications
US6399874B1 (en) * 2001-01-11 2002-06-04 Charles Dennehy, Jr. Solar energy module and fresnel lens for use in same
US20040141241A1 (en) * 2002-10-07 2004-07-22 Fresnel Technologies Inc. Imaging lens for infrared cameras
US6948831B1 (en) 2004-01-20 2005-09-27 Shams Naqvi Recessed light assembly adapted for use with motion detector
US20050264878A1 (en) * 2003-06-17 2005-12-01 Cross Match Technologies, Inc. System for print imaging with prism illumination optics
US7009789B1 (en) 2000-02-22 2006-03-07 Mems Optical, Inc. Optical device, system and method
US20070018106A1 (en) * 2005-03-21 2007-01-25 Visonic Ltd. Passive infra-red detectors
US20080093764A1 (en) * 2004-08-19 2008-04-24 The Japan Steel Works, Ltd. Method And Apparatus For Manufacturing A Molded Product
US20090112068A1 (en) * 2007-10-24 2009-04-30 Spotlight Surgical, Inc. Blade Insert Illuminator
US20090261237A1 (en) * 2008-04-22 2009-10-22 Trw Automotive Electronics & Components Gmbh Optical sensor device
US20090302222A1 (en) * 2006-07-27 2009-12-10 Visonic Ltd Passive Infrared Detectors
US20110041916A1 (en) * 2009-08-19 2011-02-24 Foxsemicon Integrated Technology, Inc. Lens with a determined pitch
US20110061721A1 (en) * 2009-09-15 2011-03-17 Foxsemicon Integrated Technology, Inc. Lens with increasing pitches
US20110155911A1 (en) * 2006-10-13 2011-06-30 Claytor Richard N Passive infrared detector
US20110157726A1 (en) * 2009-12-28 2011-06-30 Foxsemicon Integrated Technology, Inc. Lens with multiple protrusions
US20150234101A1 (en) * 2012-10-12 2015-08-20 Vision Engineering Limited Optical objective with enlargement of the exit pupil by means of a diffractive element
US20150234183A1 (en) * 2012-10-12 2015-08-20 Vision Engineering Limited Optical instruments
US9188487B2 (en) 2011-11-16 2015-11-17 Tyco Fire & Security Gmbh Motion detection systems and methodologies
US9201228B1 (en) 2013-02-27 2015-12-01 Focal Technologies, Inc. Light processing system
US11382711B2 (en) 2008-08-13 2022-07-12 Invuity, Inc. Cyclo olefin polymer and copolymer medical devices

Families Citing this family (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0320887B1 (en) * 1987-12-14 1993-08-11 Ichikoh Industries Limited Method for forming fresnel-type prism lens
JPH071687Y2 (en) * 1988-08-22 1995-01-18 株式会社小糸製作所 Lens for vehicle lighting
JPH0315003A (en) * 1989-03-16 1991-01-23 Omron Corp Grating lens and light converging grating coupler
US4936666A (en) * 1989-08-08 1990-06-26 Minnesota Mining And Manufacturing Company Diffractive lens
GB2237122B (en) * 1989-10-16 1993-10-27 Combined Optical Ind Ltd Improved fresnel lens
US5044706A (en) * 1990-02-06 1991-09-03 Hughes Aircraft Company Optical element employing aspherical and binary grating optical surfaces
US5138495A (en) * 1990-07-27 1992-08-11 Matsushita Electric Industrial Co., Ltd. Diffractive optical lens
US5162941A (en) * 1991-07-23 1992-11-10 The Board Of Governors Of Wayne State University Confocal microscope
US5444431A (en) * 1992-11-19 1995-08-22 Kenny; Paul M. Intrusion monitoring device
AU681261B2 (en) * 1994-03-17 1997-08-21 Bifocon Optics Forschungs- Und Entwicklungs Gmbh Zoned lens
US5742438A (en) * 1994-09-16 1998-04-21 In Focus Systems, Inc. Projection illumination system
IL112396A (en) * 1995-01-19 1999-05-09 Holo Or Ltd Intrusion detector
US5640143A (en) * 1995-02-06 1997-06-17 Mytech Corporation Occupancy sensor and method of operating same
US5662411A (en) * 1995-03-20 1997-09-02 Regent Lighting Corporation Motion activated light fixture with fixed sensor
US5590953A (en) * 1995-04-27 1997-01-07 Regent Lighting Corporation Directable decorative lantern with motion sensor
USD385652S (en) * 1995-05-03 1997-10-28 Regent Lighting Corporation Decorative lantern base
US5626417A (en) * 1996-04-16 1997-05-06 Heath Company Motion detector assembly for use with a decorative coach lamp
US5986357A (en) 1997-02-04 1999-11-16 Mytech Corporation Occupancy sensor and method of operating same
US5980454A (en) * 1997-12-01 1999-11-09 Endonetics, Inc. Endoscopic imaging system employing diffractive optical elements
US6222191B1 (en) 1997-12-24 2001-04-24 Mytech Corporation Occupancy sensor
IL138708A (en) 1998-01-04 2004-08-31 Visonic Ltd Passive infra-red intrusion sensing system covering downward zone
US5996898A (en) * 1998-04-07 1999-12-07 University Of Central Florida Automatic occupancy and temperature control for ceiling fan operation
DE19822053B4 (en) * 1998-05-16 2007-01-18 Insta Elektro Gmbh Fresnel lens arrangement for passive infrared motion detectors
JP2002055273A (en) * 2000-08-07 2002-02-20 Enplas Corp Image pickup lens
US6850159B1 (en) 2001-05-15 2005-02-01 Brian P. Platner Self-powered long-life occupancy sensors and sensor circuits
US6724545B2 (en) * 2001-09-14 2004-04-20 Enplas Corporation Image pickup lens and design method thereof
US6896375B2 (en) * 2002-08-16 2005-05-24 Infocus Corporation Rear projection display device having multiple mirrors that are substantially parallel to a screen
US20040258563A1 (en) * 2003-06-23 2004-12-23 Applera Corporation Caps for sample wells and microcards for biological materials
EP1639398B9 (en) * 2003-06-30 2012-02-22 Werner Fiala Intra-ocular lens or contact lens exhibiting large depth of focus
US20050030759A1 (en) * 2003-08-04 2005-02-10 Guide Corporation Bifocal hyperbolic catadioptric collection system for an automotive lamp
US6937404B2 (en) * 2003-11-20 2005-08-30 Grote Industries, Inc. Vehicle window providing multiple operator viewing angles
US7690814B2 (en) * 2005-03-10 2010-04-06 Honeywell International Inc. Luminaire with a one-sided diffuser
CN100394217C (en) * 2005-04-29 2008-06-11 云辰电子开发股份有限公司 Thin spherical lens
US20070216851A1 (en) * 2006-03-01 2007-09-20 Citizen Watch Co., Ltd. Liquid crystal lens and imaging lens device
US7745750B2 (en) * 2006-03-17 2010-06-29 Lutron Electronics Co., Inc. Dimmer switch having an illuminated button and slider slot
US7791282B2 (en) * 2006-11-28 2010-09-07 Hubbell Incorporated Motion sensor switch for 3-way light circuit and method of lighting control using the same
TW201011349A (en) * 2008-09-10 2010-03-16 E Pin Optical Industry Co Ltd Plano-Fresnel LED lens for angular distribution patterns and LED assembly thereof
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US8346403B2 (en) 2010-06-04 2013-01-01 Cooper Technologies Company, Inc. In-wall occupancy sensor with mode selection features
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US10480996B2 (en) 2015-01-05 2019-11-19 Ideal Industries Lighting Llc Light fixture with integrated sensor
US10234121B2 (en) 2015-01-05 2019-03-19 Cree, Inc. Flat trim ring lens for occupancy sensors
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US20180323354A1 (en) * 2017-05-07 2018-11-08 Yang Wang Light emitting device and method for manufacturing light emitting device

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736894A (en) * 1946-01-22 1956-02-28 Bell Telephone Labor Inc Directive antenna systems
US2931913A (en) * 1953-01-02 1960-04-05 Jr Geary A Long Radiation receiver
US3203306A (en) * 1961-09-25 1965-08-31 Lefferts Peter Optical ray concentrator
US3390399A (en) * 1967-01-11 1968-06-25 Honeywell Inc Optical recorder utilizing a fresnel/lenticular lens system
US3703718A (en) * 1971-01-07 1972-11-21 Optical Coating Laboratory Inc Infrared intrusion detector system
US3743385A (en) * 1970-04-02 1973-07-03 Anchor Hocking Corp Fresnel aspheric lens
US3839640A (en) * 1973-06-20 1974-10-01 J Rossin Differential pyroelectric sensor
US3991741A (en) * 1975-03-20 1976-11-16 Northrup Jr Leonard L Roof-lens solar collector
US4087688A (en) * 1976-06-16 1978-05-02 Cerberus Ag Infrared radiation-burglary detector
US4115701A (en) * 1976-12-09 1978-09-19 General Electric Company Coaxial reflex photoelectric scanner
US4204881A (en) * 1978-10-02 1980-05-27 Mcgrew Stephen P Solar power system
US4210391A (en) * 1977-09-14 1980-07-01 Cohen Allen L Multifocal zone plate
US4293196A (en) * 1979-08-13 1981-10-06 Fantacia Objective lens system with aspheric Fresnel elements
US4321594A (en) * 1979-11-01 1982-03-23 American District Telegraph Company Passive infrared detector
US4340283A (en) * 1978-12-18 1982-07-20 Cohen Allen L Phase shift multifocal zone plate
US4391495A (en) * 1981-06-02 1983-07-05 The Austin Company Image display system
US4535240A (en) * 1983-09-23 1985-08-13 Vigurs John P C Intruder detection
US4717821A (en) * 1985-03-29 1988-01-05 U.S. Philips Corporation Flat wide-angle lens array with a common focus

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736894A (en) * 1946-01-22 1956-02-28 Bell Telephone Labor Inc Directive antenna systems
US2931913A (en) * 1953-01-02 1960-04-05 Jr Geary A Long Radiation receiver
US3203306A (en) * 1961-09-25 1965-08-31 Lefferts Peter Optical ray concentrator
US3390399A (en) * 1967-01-11 1968-06-25 Honeywell Inc Optical recorder utilizing a fresnel/lenticular lens system
US3743385A (en) * 1970-04-02 1973-07-03 Anchor Hocking Corp Fresnel aspheric lens
US3703718B1 (en) * 1971-01-07 1982-04-13
US3703718A (en) * 1971-01-07 1972-11-21 Optical Coating Laboratory Inc Infrared intrusion detector system
US3839640A (en) * 1973-06-20 1974-10-01 J Rossin Differential pyroelectric sensor
US3991741A (en) * 1975-03-20 1976-11-16 Northrup Jr Leonard L Roof-lens solar collector
US4087688A (en) * 1976-06-16 1978-05-02 Cerberus Ag Infrared radiation-burglary detector
US4115701A (en) * 1976-12-09 1978-09-19 General Electric Company Coaxial reflex photoelectric scanner
US4210391A (en) * 1977-09-14 1980-07-01 Cohen Allen L Multifocal zone plate
US4204881A (en) * 1978-10-02 1980-05-27 Mcgrew Stephen P Solar power system
US4340283A (en) * 1978-12-18 1982-07-20 Cohen Allen L Phase shift multifocal zone plate
US4293196A (en) * 1979-08-13 1981-10-06 Fantacia Objective lens system with aspheric Fresnel elements
US4321594A (en) * 1979-11-01 1982-03-23 American District Telegraph Company Passive infrared detector
US4391495A (en) * 1981-06-02 1983-07-05 The Austin Company Image display system
US4535240A (en) * 1983-09-23 1985-08-13 Vigurs John P C Intruder detection
US4717821A (en) * 1985-03-29 1988-01-05 U.S. Philips Corporation Flat wide-angle lens array with a common focus

Non-Patent Citations (39)

* Cited by examiner, † Cited by third party
Title
"An Infrared Spectroscopy Atlas for the Coatings Industry," by The Infrared Spectroscopy Committee of the Chicago Society for Coatings, (Preface) and p. 27 of Chapter V: Qualitative Analysis.
"Design and Construction of Fresnel Optics for Photoelectric Receivers," by E.A. Boettner and N.E. Barnett, Journal of the Optical Society of America, Nov., 1951, pp. 849-857.
"Design and Manufacture of high Quality Plastic Infrared Fresnel Lenses," by G. Bradburn, SPIE vol. 590 Infrared Technology and Applications (1985), pp. 87-92.
"Fresnel Lens for Movement Sensing," Amperex Electronic Corporation, Apr., 1985.
"Fresnel Lenses for Infrared Wavelengths," Lectric Lites Co. 1980.
"Fundamentals of Optics," by Francis A. Jenkins and Harvey E. White, 1976, Chapter 18: Fresnel Diffraction, pp. 378-386.
"Modern Optics," Earle B. Brown, 1965, pp. 104-106, 273-277, 278-284, 339-341.
"Optical Materials: Transmission and Refractive Index," The Photonics Design and Application Handbook, 1988, H-286-287.
"Optical Production Technology," by D.F. Horne, 1972, p. 257.
"Optics", by Arnold Sommerfield, (1954) pp. 216-220.
"Physical Optics", by Robert W. Wood, 1961, pp. 33-39.
"The Atlas of Near Infrared Spectra," by Sadtler (7 pages).
"The Infrared Spectra Atlas of Monomers and Polymers," by Sadtler (6 pages).
"The Phase Fresnel Lens," by Kenro Miyamoto, Journal of the Optical Society of America, Jan., 1961, vol. 51, pp. 17-20.
1.8 Foot Focal Length Lens, 15 Foot Focal Lens and 1.35 LODIFF Lens, Grooves Out Molded in PolyIR 2 0.015 . *
1.8 Foot Focal Length Lens, 15 Foot Focal Lens and 1.35" LODIFF™ Lens, Grooves Out Molded in PolyIR®2 0.015".
An Infrared Spectroscopy Atlas for the Coatings Industry, by The Infrared Spectroscopy Committee of the Chicago Society for Coatings, (Preface) and p. 27 of Chapter V: Qualitative Analysis. *
Design and Construction of Fresnel Optics for Photoelectric Receivers, by E.A. Boettner and N.E. Barnett, Journal of the Optical Society of America, Nov., 1951, pp. 849 857. *
Design and Manufacture of high Quality Plastic Infrared Fresnel Lenses, by G. Bradburn, SPIE vol. 590 Infrared Technology and Applications (1985), pp. 87 92. *
Electro Optical Systems Design, vol. 14, No. 2, Feb. 1982, pp. 47 51. *
Electro-Optical Systems Design, vol. 14, No. 2, Feb. 1982, pp. 47-51.
Fresnel Lens for Movement Sensing, Amperex Electronic Corporation, Apr., 1985. *
Fresnel Lenses for Infrared Wavelengths, Lectric Lites Co. 1980. *
Fundamentals of Optics, by Francis A. Jenkins and Harvey E. White, 1976, Chapter 18: Fresnel Diffraction, pp. 378 386. *
Long wave Optics, by George W. Chantry, vol. 1, 1984, pp. 1 9, 20 24. *
Long-wave Optics, by George W. Chantry, vol. 1, 1984, pp. 1-9, 20-24.
Modern Dictionary of Electronics, by Rudolf F. Graf, 1984, p. 409. *
Modern Optics, Earle B. Brown, 1965, pp. 104 106, 273 277, 278 284, 339 341. *
Optical Materials: Transmission and Refractive Index, The Photonics Design and Application Handbook, 1988, H 286 287. *
Optical Production Technology, by D.F. Horne, 1972, p. 257. *
Optics , by Arnold Sommerfield, (1954) pp. 216 220. *
Optics, by Eugene Hecht, 1987, pp.445 447. *
Optics, by Eugene Hecht, 1987, pp.445-447.
Physical Optics , by Robert W. Wood, 1961, pp. 33 39. *
Pyrex Glass Code 7740, Material Properties, Graphs: Infrared Transmittance and Full Spectrum Transmittance. *
Pyrex® Glass Code 7740, Material Properties, Graphs: Infrared Transmittance and Full Spectrum Transmittance.
The Atlas of Near Infrared Spectra, by Sadtler (7 pages). *
The Infrared Spectra Atlas of Monomers and Polymers, by Sadtler (6 pages). *
The Phase Fresnel Lens, by Kenro Miyamoto, Journal of the Optical Society of America, Jan., 1961, vol. 51, pp. 17 20. *

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1006399A3 (en) * 1998-12-02 2003-05-07 Kuraray Co., Ltd. Fresnel lens sheet
EP1006399A2 (en) * 1998-12-02 2000-06-07 Kuraray Co., Ltd. Fresnel lens sheet
US6348684B1 (en) 1999-03-25 2002-02-19 Lucent Technologies Inc. Receiving system for free-space optical communications
US7009789B1 (en) 2000-02-22 2006-03-07 Mems Optical, Inc. Optical device, system and method
US6399874B1 (en) * 2001-01-11 2002-06-04 Charles Dennehy, Jr. Solar energy module and fresnel lens for use in same
US7187505B2 (en) 2002-10-07 2007-03-06 Fresnel Technologies, Inc. Imaging lens for infrared cameras
US20040141241A1 (en) * 2002-10-07 2004-07-22 Fresnel Technologies Inc. Imaging lens for infrared cameras
US7474477B2 (en) 2002-10-07 2009-01-06 Fresnel Technologies, Inc. Imaging lens for infrared cameras
US20070002467A1 (en) * 2002-10-07 2007-01-04 Fresnel Technologies Inc. Imaging lens for infrared cameras
US20050264878A1 (en) * 2003-06-17 2005-12-01 Cross Match Technologies, Inc. System for print imaging with prism illumination optics
US7426020B2 (en) 2003-06-17 2008-09-16 Cross Match Technologies, Inc. System for print imaging with prism illumination optics
US6948831B1 (en) 2004-01-20 2005-09-27 Shams Naqvi Recessed light assembly adapted for use with motion detector
US20080093764A1 (en) * 2004-08-19 2008-04-24 The Japan Steel Works, Ltd. Method And Apparatus For Manufacturing A Molded Product
US8119054B2 (en) * 2004-08-19 2012-02-21 Japan Steel Works, Ltd. Method and apparatus for manufacturing a molded product
US20070152156A1 (en) * 2005-03-21 2007-07-05 Visonic Ltd. Passive infra-red detectors
US7319228B2 (en) 2005-03-21 2008-01-15 Visionic Ltd. Passive infra-red detectors
US7250605B2 (en) 2005-03-21 2007-07-31 Visonic Ltd. Passive infra-red detectors
US20070029486A1 (en) * 2005-03-21 2007-02-08 Visonic Ltd. Passive infra-red detectors
US20070145277A1 (en) * 2005-03-21 2007-06-28 Visonic Ltd. Passive infra-red detectors
US20090014654A1 (en) * 2005-03-21 2009-01-15 Visonic Ltd. Passive infra-red detectors
US7504633B2 (en) 2005-03-21 2009-03-17 Visonic Ltd. Passive infra-red detectors
US8138478B2 (en) 2005-03-21 2012-03-20 Visonic Ltd. Passive infra-red detectors
US7573032B2 (en) 2005-03-21 2009-08-11 Visonic Ltd. Passive infra-red detectors
US20070018106A1 (en) * 2005-03-21 2007-01-25 Visonic Ltd. Passive infra-red detectors
US7705310B2 (en) 2005-03-21 2010-04-27 Visonic Ltd. Passive infra-red detectors
US20090309029A1 (en) * 2006-07-27 2009-12-17 Visonic Ltd. Passive infrared detectors
US8017913B2 (en) 2006-07-27 2011-09-13 Visonic Ltd. Passive infrared detectors
US7875852B2 (en) 2006-07-27 2011-01-25 Visonic Ltd Passive infrared detectors
US20090302222A1 (en) * 2006-07-27 2009-12-10 Visonic Ltd Passive Infrared Detectors
US9885608B2 (en) 2006-10-13 2018-02-06 Fresnel Technologies, Inc. Passive infrared detector
US20110155911A1 (en) * 2006-10-13 2011-06-30 Claytor Richard N Passive infrared detector
US9116037B2 (en) 2006-10-13 2015-08-25 Fresnel Technologies, Inc. Passive infrared detector
US9468366B2 (en) 2007-10-24 2016-10-18 Invuity, Inc. Blade insert illuminator
US8088066B2 (en) 2007-10-24 2012-01-03 Invuity, Inc. Blade insert illuminator
US20090112068A1 (en) * 2007-10-24 2009-04-30 Spotlight Surgical, Inc. Blade Insert Illuminator
US9060707B2 (en) 2007-10-24 2015-06-23 Invuity, Inc. Blade insert illuminator
US11583175B2 (en) 2007-10-24 2023-02-21 Invuity, Inc. Blade insert illuminator
US10582844B2 (en) 2007-10-24 2020-03-10 Invuity, Inc. Blade insert illuminator
US9986901B2 (en) 2007-10-24 2018-06-05 Invuity, Inc. Blade insert illuminator
US20090261237A1 (en) * 2008-04-22 2009-10-22 Trw Automotive Electronics & Components Gmbh Optical sensor device
US8269202B2 (en) * 2008-04-22 2012-09-18 Trw Automotive Electronics & Components Gmbh Optical sensor device
US11382711B2 (en) 2008-08-13 2022-07-12 Invuity, Inc. Cyclo olefin polymer and copolymer medical devices
US20110041916A1 (en) * 2009-08-19 2011-02-24 Foxsemicon Integrated Technology, Inc. Lens with a determined pitch
US20110061721A1 (en) * 2009-09-15 2011-03-17 Foxsemicon Integrated Technology, Inc. Lens with increasing pitches
US20110157726A1 (en) * 2009-12-28 2011-06-30 Foxsemicon Integrated Technology, Inc. Lens with multiple protrusions
US9188487B2 (en) 2011-11-16 2015-11-17 Tyco Fire & Security Gmbh Motion detection systems and methodologies
US10191278B2 (en) * 2012-10-12 2019-01-29 Vision Engineering Limited Optical instruments
US10338284B2 (en) * 2012-10-12 2019-07-02 Vision Engineering Limited Optical objective with enlargement of the exit pupil by means of a diffractive element with a lenticule comprising an irregular feature
US20150234183A1 (en) * 2012-10-12 2015-08-20 Vision Engineering Limited Optical instruments
US20150234101A1 (en) * 2012-10-12 2015-08-20 Vision Engineering Limited Optical objective with enlargement of the exit pupil by means of a diffractive element
US9435989B1 (en) 2013-02-27 2016-09-06 Focal Technologies, Inc. Light processing system
US9201228B1 (en) 2013-02-27 2015-12-01 Focal Technologies, Inc. Light processing system

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