[특허]Light diffusing device

Light diffusing device 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G09F-013/18
출원번호	US-0652574 (1976-01-26)
우선권정보	JA-0012799 (1975-01-30); JA-0052177 (1975-04-17); JA-0062501 (1975-05-08); JA-0069013 (1975-05-22); JA-0123458 (1975-09-09); JA-0125560 (1975-09-11)
발명자 / 주소	Tachihara Noribumi (Tokyo JA) Mizohata Yukio (Kawagoe JA) Makita Jun-ichi (Tokorozawa JA)
출원인 / 주소	Copal Company Limited (Tokyo JA 03)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

The light diffusing device for illumination purpose includes a light source, a thin transparent base plate having a front illuminating surface and a rear surface and arranged with its side edge adjacent to the light source so as to receive light therefrom and a light reflecting plate located adjacent to or in contact with the rear surface of the base plate. The rear surface is treated so as to have a directional light reflecting property as well as a light transmitting property so that a portion of the light received from the light source is directly emanated from the front surface of the base plate while a portion of the remainder of the light is repeatedly reflected by the rear surface and the front surface predominantly toward the opposite side edge of the base plate so as to be emanated from the front surface, the remainder of the light being reflected by the reflecting plate after passing through the rear surface, thereby permitting the light to be emanated from the front surface uniformly over the entire area thereof. The light diffusion device provides a surface illuminating device for various appliances.

대표청구항 ▼

In a light diffusing device for illumination purposes including a light source, a thin transparent base plate having a front illuminating surface and a rear surface with a side edge arranged adjacent to said light source, said rear surface being a roughened surface with a directional light reflecting property parallel to major side edges of said base plate, and a light reflecting plate arranged adjacent to said rear surface for permitting light from said light source to be received into said base plate and emanated from said front illuminating surface directly or after being reflected by said rear surface and said light reflecting plate so that uniform illumination is obtained over the entire area of said front illuminating surface, the light reflecting property of said roughened rear surface being determined so that, when the light is incident thereto at an angle of 75°in a plane parallel to the direction of the major side edges of said base plate, the peak of the reflecting power is in the range of 5-30% at the reflecting angle of 75°and the width of the half value is in the range of 4°-6°, when the light is incident at an angle of 75°in a plane perpendicular to the direction of the major side edges, the peak of the reflecting poweR is in the range of 5-30% at the reflecting angle of 75°and the width of the half value is in the range of 6°-10°, said light reflecting plate having a light reflecting power substantially greater than 30% and a width of the half value of the distribution of the reflecting light greater than 90°, whereby uniform illumination prevails over the entire area of said illuminating surface by a combination of the optical properties of said rear surface and said reflecting plate, said rear surface of said base plate having a plurality of small parallel grooves defined by a plurality of small parallel ridges running in the direction from said side edge of said base plate adjacent to said light source to the opposite side edge, said light reflecting plate being of a light diffusing reflecting surface having an extremely low transparency and absorption.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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