| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide plate of a surface light source preventing emission lines and bright spots near the light source, and uniformalizing intensity distribution of light after incidence into the light guide plate. SOLUTION: The light guide plate is made of a platy translucent material with its side faces as light-incident faces and changing optical paths of light from the light source arranged in opposition to the light-incident faces, and irradiates surface illumination light on an illumination object from its top face. The plate has concavities and convexities formed on the light-incident faces consisting of a smoothly continuing curved surface. COPYRIGHT: (C)2005,JPO&NCIPI
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