| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve durability and to prevent a resistor from being worn with a contact piece by providing plural metallic films having separate resistance values according to the positions of the continuously formed resistors and detecting a rotational position from the obtained resistance value by bringing a conductive needle into contact with the metallic films. SOLUTION: A disk like rotational position detection part rotating integrally with it is provided on a rear surface of a loading ring. A continuous carbon film resistor is provided on its rear surface, and plural metallic films 72b1-72b4 imparted with the resistance value according to a circumferential angle of a connective position with the carbon film are arranged concentrically on its front surface. The metallic film 72b is rotated while being in contact with the projection parts 71a1, 71a2 of the conductive needle 71a according to the rotation of the loading ring. At this time, a corresponding voltage is outputted from an output terminal 72e by changing the resistance value by the resistor. The resistance value is changed according to the case when the conductive needles 71a1, 71a2 are in contact together with the metallic film 72b and the case when one of them is in contact with the metallic film or the like. Thus, the rotational position is obtained by the output voltage corresponding to the resistance value.</p> |
