Illumination – Light modifier – Refractor
Patent
1992-03-27
1994-11-08
Lazarus, Ira S.
Illumination
Light modifier
Refractor
362 26, 362 31, F21V 704
Patent
active
053632940
ABSTRACT:
A surface light source device includes a light guiding plate which is transparent, a line light source provided on one end edge of the light guiding plate, an end edge reflection layer provided on the other end edge of the light guiding plate, and a light diffusion/transmission section provided on a back face of the light guiding plate. A ratio of an area of the light diffusion/transmission section to a whole area of the back face of the light guiding plate gradually increases with an increase in distance from the light source end edge in a region from the end edge on the light source end of the light guiding plate to a position at which a surface emission luminance of the light guiding plate is lowest, and is constant in a region from the position to the other end edge on the end edge reflection layer end of the light guiding plate. A back face reflection layer which is white is provided on the back face of the light guiding plate.
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patent: 5134549 (1992-07-01), Yokoyama
Fukushima Hiroshi
Yamamoto Kunitoshi
Lazarus Ira S.
Nissha Printing Co. Ltd.
Quach Y.
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