| 摘要 |
When a leaf spring 22 is rotated integrally with the rotation of a knob dial 18, the leaf spring 22 is pushed and deflected by three corners of a cylindrical section 17a. After that, when three corners of the cylindrical section 17a get over the leaf spring 22 and new three surfaces are engaged with the leaf spring 22, rotation of the knob dial 18 is regulated. In this case, the pushing direction of the leaf spring 22 is the same as the direction of deflection. Therefore, the rotational resistance of the knob dial 18 can be reduced. Accordingly, a feeling of operation of the knob dial 18 becomes light.
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