| 摘要 |
PROBLEM TO BE SOLVED: To confirm illumination even from an oblique direction of a push button, and to uniformly illuminate the whole circumference of the push button even for the push button having a relatively large diameter. SOLUTION: The push button 7 is slidably supported in a slide hole 16 of a light guide 15 formed in a ring-like shape, and a switch 5 is turned on to cause LEDs 25 to emit light by pressing it. The light guide 15 is provided with recessed parts 22 having a profile formed into a triangular shape for introducing light from the LEDs 25, and a light extraction part 19 formed into a conical shape for extracting light. A diffusely reflecting part 20 formed by a projecting body and a recessed groove continuing in the circumferential direction of the light guide 15 is formed on a surface of the light extraction part 19. COPYRIGHT: (C)2008,JPO&INPIT
|
