| 摘要 |
PROBLEM TO BE SOLVED: To increase brightness at the coroner of a light guide body and make brightness on an effective light-emitting surface of the light guide body uniform by forming a light guide part made of a slope formed by cutting aslant the corner in the corner facing a non-light-emitting part of a light source, mirror- finishing the slope, and forming the boundary between the slope and a plane in the continuous surface having a curved surface and no strain. SOLUTION: A light guide body 9 has a light guide part 27 which receives light from a light source 12 and increases brightness in a plane 26 in a corner in the corner facing a non-light-emitting part 18 of the light source 12. As the light guide part 27, a slope formed by cutting aslant the corner of the light guide body 9 is used, mirror-finished, and the angle of the slope is set to a range of about 10-20 deg.. A dimension L along the side of the light guide body 9 is set longer than that of the non-light-emitting part 18 of the light source 12, and light from a light-emitting part 17 is guides so as to teach the whole part of the corner of the light guide body 9. The boundary between the slope 27 and the plane 26 is formed in a continuous curved shape (continuous part) with no strain. |
