Surface light source device
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United States of America Patent
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Dec 17, 1996
Grant Date -
N/A
app pub date -
Nov 30, 1992
filing date -
Nov 28, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A surface light source device which comprises a light-conducting member consisting of a sheet of transparent material, a linear light source disposed adjacent to an edge surface of the light-conducting member, a diffusion plate disposed on a front surface of the light-conducting member and a reflective plate disposed on a rear side of the light-conducting member. The rear surface of the light-conducting member has depressions or projections. These depressions or projections have rough surfaces. By selecting the shape of the depressions or projections, and controlling the roughness of the rough surfaces, an enhanced uniform brightness distribution is provided.
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