Light Guide Plate and Surface Lighting Device
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United States of America Patent
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Issued Date -
Jun 25, 2009
app pub date -
Aug 25, 2008
filing date -
Dec 25, 2007
priority date (Note) -
Abandoned
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Abstract
A light guide plate includes a transparent body, a plurality strip-shaped light diffusion structures and a plurality of strip-shaped light-collecting structures. The transparent body has a first light exit surface and a light incident surface adjacent to the first light exit surface. The strip-shaped light diffusion structures convexly extend from the first light exit surface of the transparent body and each of the strip-shaped light diffusion structures has a second light exit surface distant from the first light exit surface. The strip-shaped light-collecting structures correspond to the strip-shaped light diffusion structures, and each of the strip-shaped light-collecting structures convexly extends from the second light exit surface of the corresponding strip-shaped light diffusion structure. A cross-sectional shape of each of the strip-shaped light-collecting structures is approximately symmetrical with respect to a central normal plane of the corresponding second light exit surface. Furthermore, a surface lighting device using the above-mentioned light guide plate is also provided.
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