| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive built-in switch with a trouble predicting function while enhancing its reliability. SOLUTION: As the switch is equipped with no contact point and provides switch output according to the output of an optical sensor 9 consisting of a light-emitting element 9a and light receiving elements 91 b and 92 b, it does not cause troubles including loose connection due to adhesion of contact points and intrusion of dust typically caused by a mechanical switch with contact points and thus enhances reliability. In addition, as a filter 20 is provided at a light path of the light receiving element 91 b side to make its sensitivity lower than that of the other light receiving element 92 b side, when light receiving output can not be obtained only from the light receiving element 91 b, the light receiving element 91 b is judged to be not working properly and thus the trouble predicting function can be realized.</p> |
