| 摘要 |
Provided is a potentiometer wherein a substrate (50) on which resistance patterns (53, 54) are formed, a rotor (40) to which a sliding element is fixed, and a torsion coil spring (35) are housed in a case (20), and wherein a rotation shaft (33) which is inserted through the torsion coil spring (35) and is connected to the rotor (40) protrudes from the case (20). In this potentiometer, the rotor (40) is equipped with a pair of spring guides (42, 43) which each partially enclose, and are in contact with, the circular cross section torsion coil spring (35). It is configured in such a way that two ends (35a, 35b) which are extended in radial directions of the torsion coil spring (35) are in elastic contact, respectively, with the two circumferential ends (43a, 43b) of the spring guide 43 and with two circumferential ends of a spring shoe (25) which are installed in such a way as to protrude from the inner circumferential surface of the case (20), and that the two ends (43a, 43b) of the spring guide 43 and the two ends (25a, 25b) of the spring shoe (25) are in point contact, respectively, with the two ends (35a, 35b) of the torsion coil spring (35). In this potentiometer equipped with an automatic return mechanism, it is possible to prevent rattle of the rotation shaft (33) in the neutral position. |
