| 摘要 |
PROBLEM TO BE SOLVED: To suppress influence on a magnetic field by preventing the mal-function of an operation switch when receiving the influence of a change in an intense magnetic field, and to prevent deterioration in sensitivity for sensing a signal. SOLUTION: Light radiated from a light source 150 is reflected against a reflection board 112 through optical fiber 113 (the first optical fiber) for light radiation. The reflected light is emitted to a detection part 151 through the optical fiber 114 (the second optical fiber) for light emission. The light is detected by the detection part 151 and switching is performed in response to the intensity of the detected light. COPYRIGHT: (C)2008,JPO&INPIT
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