| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light source permitting to make a display surface almost uniformly bright with a reduced number of LEDs, and allowing anybody to easily attach and wire in small man-hours even when a display surface including an R-part, for example, like characters is required. <P>SOLUTION: As a result of having pursued a case form of which an angle of incidence to the case does not exceed 45 degrees to the light of LED 5a, the case form 7 in the figure is preferable, namely, it is preferable that the distances from the LED 5a up to the inside surface and outside surface is constant in the range of 180 degrees in the whole angles in the optical axis direction of the LED 5a. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
