Surface light source device

Details Surface light source device Surface light source device

1991-03-11

1992-07-28

Lazarus, Ira S.

Illumination

Revolving

362223, F21V 800

Patent

active

051345498

ABSTRACT:
A surface light source device comprising a linear light source, a light transmitting member having an end surface of incidence located in the vicinity of the light source, a diffusing plate arranged on the front surface of the light transmitting member and a reflecting plate arranged on the rear surface of the light transmitting member; pattens formed as portions having diffusing functions being arranged on the rear surface of the light transmitting member, and the portions having the diffusing function being sparse in area in the vicinity of the center of the end surface of incidence and becoming denser as the portions are farther from the end surface of incidence. The surface light source device is adapted so as to uniformalize luminance on the diffusing plate.

REFERENCES:
patent: 2347665 (1944-05-01), Christensen et al.
patent: 4779166 (1988-10-01), Tanaka et al.
patent: 4811507 (1989-03-01), Bianghet
patent: 4860171 (1989-08-01), Kojima
patent: 4937709 (1990-06-01), Yanagi et al.
patent: 4965950 (1990-10-01), Yamada

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