| 摘要 |
PROBLEM TO BE SOLVED: To detect electrically a switching position of an optical fiber by providing an electrode plate and a second movable yoke between two fixed yokes of magnetic poles of a permanent magnet and fitting electrodes to the electrode plate and two fixed yokes. SOLUTION: A movable yoke 104 is fixed to the tip of the optical fiber 111. The permanent magnet 101 and the electrode plate are fixed to a fixed block 107, and further, a second movable yoked 105 is fitted to the fixed block 107. One side of the end part of the second movable yoke 105 is in contact with the fixed yoke 102a wound with a coil 109. The coil 110 is wound around the fixed yoke 103a arranged on the opposite side of the fixed yoke 102a. Respective coil electrodes 117, 118 are fitted to the coils 109, 110. Respective electrodes 114, 116 are fitted to the fixed yokes 102a, 103a, and the electrode 115 is fitted to the second movable yoke 105. The electrode through which a current flows is changed according to the contact state of the second movable yoke 105 with the fixed yokes 102a, 103a. |
