| 摘要 |
In conventional self-lighting type push-button input devices there is adopted a construction wherein push-button portions and a base plate are formed using the same material. Since a light conducting function cannot be expected of the base plate, it is necessary to provide the same number of lamps as the number of push-button portions, with consequent increase of size and cost. In a self-lighting type push-button input device according to the present invention, a button base portion can be formed of a transparent material, holes can be formed in predetermined positions of the button base portion, and spring portions can be formed integrally with the holes by molding with use of transparent silicone rubber with a light diffusing agent incorporated therein. With this construction, the button base portion 2 serves as a light conducting portion able to effect the propagation of light without causing any loss, and the spring portions can uniformly diffuse the light distributed thereto by the light conducting portion, whereby lighting can be effected by a reduced number of light sources, that is, the reduction of size and cost can be attained to solve conventional problems.
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