IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0725864
(2012-12-21)
|
등록번호 |
US-8740439
(2014-06-03)
|
발명자
/ 주소 |
- Holman, Robert L.
- Sampsell, Matthew B.
|
출원인 / 주소 |
- QUALCOMM MEMS Technologies, Inc.
|
대리인 / 주소 |
Knobbe Martens Olson & Bear LLP
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
172 |
초록
▼
The present invention introduces a new class of thin doubly collimating light distributing engines for use in a variety of general lighting applications. Output illumination from these slim-profile illumination systems whether square, rectangular or circular in physical aperture shape is directional
The present invention introduces a new class of thin doubly collimating light distributing engines for use in a variety of general lighting applications. Output illumination from these slim-profile illumination systems whether square, rectangular or circular in physical aperture shape is directional, square, rectangular or circular in beam cross-section, and spatially uniform and sharply cutoff outside the system's adjustable far-field angular cone. Some embodiments provided include thin light distributing engines which provide input light collimated in one meridian and a light distributing element that maintains input collimation while collimating output light in the un-collimated orthogonal meridian, in such a manner that the system's far-field output light is collimated in both its orthogonal output meridians. The present invention can also include optical films that process the engine's doubly collimated output illumination so as to increase its angular extent one or both output meridians without changing beam shape or uniformity.
대표청구항
▼
1. An illuminating system, comprising: a single LED emitter having a square or rectangular emitting aperture that is d1 by d2;a four sided etendue preserving angle transforming reflector whose input aperture is disposed adjacent to the output emitting aperture of the single LED emitter receiving LED
1. An illuminating system, comprising: a single LED emitter having a square or rectangular emitting aperture that is d1 by d2;a four sided etendue preserving angle transforming reflector whose input aperture is disposed adjacent to the output emitting aperture of the single LED emitter receiving LED emission;a light guiding pipe whose input aperture receives light from an output aperture of the etendue preserving angle transforming reflector element, the light guiding pipe comprising a tapered light guide bar having rectangular cross-section and a light guiding pipe refraction index,a first optical film having a first optical film refractive index different than the light guiding pipe refraction index, anda first prismatic lens sheet having a first prismatic lens sheet refractive index and a specularly reflecting coating deposited upon facets of the first prismatic lens sheet, the first optical film provided between the tapered light guide bar and the first prismatic lens sheet; anda light guiding plate one edge of which is disposed adjacent to a rectangular edge of the light guiding pipe. 2. The illuminating system of claim 1 wherein the four sided etendue preserving angle transforming reflector transforms the LED's wide angle output emission to output light passing through its output aperture in both meridians of the light guiding pipe with an angular extent substantially equaling +/−θ, where +/−θ is determined by the applicable etendue preserving Sine Law, θ=Sin−1(di/Di), where Di and di refer to the input and output aperture dimensions in each meridian. 3. The illuminating system of claim 1, wherein the light guiding pipe provides evenly distributed output light along the rectangular edge, collimated in one meridan. 4. The illuminating system of claim 1, further comprising one or more lenticular lens sheets disposed beyond a rectangular output face of the light guiding plate, their lenticules facing towards the rectangular output face. 5. The illuminating system of claim 4 wherein the one or more lenticular lens sheets contain parabollically-shaped lenticules. 6. The illuminating system of claim 4 wherein the one or more lenticular lens sheets are oriented with respect to each other such that their lenticular lens axes are substantially orthogonal to each other. 7. The illuminating system of claim 1 having one or more diffuser sheets disposed beyond a rectangular output face of the light guiding plate. 8. The illuminating system of claim 1 wherein an input aperture of the light guiding plate is covered completely or partially by a lenticular lens film whose plane surface is disposed towards the input aperture and whose lenticular lens axes are aligned either parallel to the edge of the input aperture, or perpendicularly to the edge of the input aperture. 9. The illuminating system of claim 1, wherein the light guiding plate provides an evenly distributed output beam across one rectangular output face, and wherein the system further comprises a tilted plane mirror disposed to receive said the output beam and redirect it in a different angular direction. 10. The illuminating system of claim 1, wherein the first prismatic lens sheet comprises a substantially continuous array of prism lenses each having left hand reflecting facets and right hand reflecting facets, the right hand facets receiving substantially all the incident light. 11. The illuminating system of claim 10 where the total included angle between the right hand facets and the left hand facets is in the range 95 to 105 degrees. 12. The illuminating system of claim 1, wherein the light guiding plate provides an evenly distributed output beam across one rectangular output face. 13. The illuminating system of claim 12, wherein the output beam is substantially square or rectangular in cross-section and well-collimated in both output meridians. 14. The illuminating system of claim 1, further comprising a prismatic lens sheet comprising a substantially continuous array of prism lenses each having left hand reflecting facets and right hand reflecting facets, the right hand facets receiving substantially all the incident light. 15. The illuminating system of claim 14 where the total included angle between right hand facets and left hand facets is in the range 75 to 120 degrees. 16. The illuminating system of claim 1, wherein the light guiding plate comprises one or more of a light guide plate having rectangular cross-section and a light guiding plate refractive index, a tapered light guide plate having rectangular cross-section and a light guiding plate refractive index, a second optical film having a second optical film refractive index, a second prismatic lens sheet having a second prismatic lens sheet refractive index and a specularly reflecting coating deposited upon facets of the second prismatic lens sheet, and a plane specularly-reflecting mirror. 17. An illuminating system, comprising: a linear array of LED emitters whose center-to-center distance between emitters is W, and each having a square or rectangular output aperture that is d1 by d2;a substrate circuit comprising means for electrically interconnecting the array of LED emitters;a linear array of rectangular four sided etendue preserving angle transforming reflectors whose rectangular input apertures are d1 by d2 and have a center-to-center spacing W, each input aperture disposed adjacent to an output aperture of an LED emitter in the array; anda light guiding plate one edge of which is disposed adjacent to output apertures of the linear array of etendue preserving reflectors, the light guiding plate comprising a tapered light guide plate having rectangular cross-section and a light guiding plate refractive index,an optical film having an optical film refractive index different than the light guiding plate refractive index, anda prismatic lens sheet having a lens sheet refractive index and a specularly reflecting coating deposited upon facets of the prismatic lens sheet, the optical film provided between the tapered light guide plate and the prismatic lens sheet. 18. The illuminating system of claim 17 wherein each of the rectangular four sided etendue preserving angle transforming reflectors in the array of rectangular four sided etendue preserving angle transforming reflectors collimates its output light through its D1 sized output aperture in the meridian parallel to the long axis of a rectangular edge of the light guiding plate with an angular extent in the meridian substantially +/−θ1, where +/−θ1 is determined by the applicable etendue preserving Sine Law, with θ1 substantially Sin−1(d1/D1). 19. The illuminating system of claim 18 wherein each of the rectangular four sided etendue preserving angle transforming reflectors in the array of rectangular four sided etendue preserving angle transforming reflectors has its opposing sidewalls shaped mathematically according to the boundary condition of preserving etendue between input aperture and output aperture. 20. The illuminating system of claim 17, the light guiding plate providing an evenly distributed output beam across one rectangular output face, the output substantially square or rectangular in cross-section and well-collimated in both output meridians.
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