| 摘要 |
PROBLEM TO BE SOLVED: To realize an illuminated switch without illuminance unevenness, thin, and suitable for key pads of a cell-phone. SOLUTION: In the switch realizing electric conduction as a protruded part 21a corresponding to an operated key top 3 displaced, and an inner face of a metal dome 10 deformed by the above to come in contact with contact points 11a, 11b, a light guide plate 4 is provided between the key top 3 and a substrate 1 for guiding light from a light source toward the key top 3. The light guide plate 4 includes a through hole 40 for the protruded part 21b to be inserted into. Further, a reflecting sheet for reflecting light guided by the light guide plate 4 toward a key top 3 side is provided between the light guide plate 4 and the substrate 1, with a surface sheet 2a having translucency provided between the key top 3 and the protruded part 21a. The key top, since it is irradiated by light emitted from the light guide plate, is free from illuminance unevenness. Moreover, as an LED is used as a light source, it is easy to handle and this possible to choose from various emission colors. COPYRIGHT: (C)2009,JPO&INPIT
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