| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a light distribution board, with light beams distributed uniformly so as to avoid the phenomenon of Gaussian distribution that makes an area below the lamp especially bright, capable of preventing the phenomenon of dazzling of eyes while looking at a light emission part of the lamp, and with other light beams around the lamp except the light beams directly under the lamp completely obscured, thus, without suffering from an adverse effect of optical pollution. <P>SOLUTION: A light distribution board having a plurality of light gratings 1003 to 1008 each with multiple focuses, is used on a light outputting surface of a lamp, in which at least a transparent board 1001 is provided on at least one of its surfaces with a plurality of light gratings 1003 to 1008 each having multiple focuses, each light grating 1003 to 1008 having multiple focuses is composed of two or more mutually integrally juxtaposed arciform (concave or convex) lenses to form a convex lens grating having two or more focuses. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
