[특허]Illumination system employing an array of microprisms

[미국특허] Illumination system employing an array of microprisms 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G02F-001/1335 F21V-008/00 G02B-005/02
출원번호	US-0368286 (1995-01-03)
발명자 / 주소	Beeson Karl W. (Princeton NJ) Steiner Ivan B. (Ridgewood NJ) Zimmerman Scott M. (Basking Ridge NJ)
출원인 / 주소	AlliedSignal Inc. (Morris Township NJ 02)
인용정보	피인용 횟수 : 89 인용 특허 : 0

초록 ▼

An optical illumination system comprising a waveguide that accepts light generated by a diffuse light source and transmits the light via total internal reflection. Attached on one surface of the waveguide is a low index of refraction layer and an array of microprisms, with each microprism having an light input surface and at least one sidewall tilted at an angle from the direction normal to the surface of the waveguide such that light escapes from the waveguide, reflects off the tilted sidewalls and emerges from the microprism as a spatially-directed light source. The low index of refraction layer prevents low angle light from entering the microprisms. An array of microlenses may be positioned to accept the output of the microprisms so that the light exiting from the microlenses is a substantially collimated light source. The optical illumination system is advantageous for any application that requires a non diffuse or substantially collimated that is both energy efficient and contained in a low profile assembly.

대표청구항 ▼

An illumination assembly for providing a spatially-directed light source comprising: (a) a light transmitting means having a first light accepting surface in close proximity to a first diffuse light source, wherein said light transmitting means transports light emanating from said first diffuse light source; (b) an array of microprisms wherein each microprism comprises: (i) a light input surface optically coupled to said light transmitting means; (ii) a first pair of oppositely disposed sidewalls wherein at least one of said sidewalls forms a first tilt angle with respect to the normal of the surface of said light transmitting means; and (iii) a second pair of oppositely disposed tilted sidewalls wherein at least one of said sidewalls forms a second tilt angle with respect to the normal of the surface of said light transmitting means; and (c) a low index of refraction layer disposed between said light transmitting means and said light input surfaces; wherein, a first portion of said light reflecting through said light transmitting means enters said array of microprisms through said light input surfaces, is redirected by said sidewalls and emerges from said microprisms as a spatially-directed light source and a second portion of said light reflecting through said light transmitting means is prevented from entering said light input surfaces by said low index of refraction layer.

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[미국특허] Illumination system employing an array of microprisms 원문보기

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