| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a defect of brightness decrease due to tarnish treatment of an illuminating cover of a lamp set. <P>SOLUTION: A light distribution board for an illuminating cover includes saw-toothed light gratings 903 each composed of a convex lens surface and a bevel plane lens surface on a transparent board 901, the saw-toothed light gratings 903 are arranged at two lateral sides of a central line of the transparent board 901 to have one side form mirror images to the other side, the bevel plane lens surfaces are arranged to face respectively to two lateral sides of the transparent board 901, while the convex lens surfaces are arranged to face the central line, and the top surface is a light-receiving surface of the lamp set. The bottom surface 902 of the transparent board 901 has formed thereon a plurality of convex-lens strip-like light gratings 902 and the bottom surface 902 is an illuminating surface of the lamp set. With this structure, light beams can be uniformly distributed and can avoid a phenomenon of Gauss distribution that makes the area below the lamp especially bright, and avoid a phenomenon of dazzling of eyes at the light-emitting member, and the light beams become more tender under the condition that loss of brightness is minimum. <P>COPYRIGHT: (C)2009,JPO&INPIT |
