| 摘要 |
PROBLEM TO BE SOLVED: To prevent zooming from being executed during focusing by providing a regulating member for regulating the movement of a cam pin in a cam groove, so that a cam member is prevented from being driven by the movement of the cam pin in the wide cam groove, when a photographing optical system is actuated for focusing. SOLUTION: A cam plate 30 which is a cam member is provided with a cam groove 30a wide in an optical axis direction. The groove 30a is provided with three island-like regulating members 30b to 30d in the center. Since the groove 30a is positioned at both ends of a locus that the cam pin 34 moves is regulated by a side wall 30f at focusing operation, the regulating members 30b to 30d and a sidewall 30g, the cam plate 30 is prevented from moving right and left, even if shock or vibration is given during standby before the actuation for focusing. The movement of the cam plate 30 is regulated in the process of the actuation for focusing, so that the finder is surely prevented from performing zooming in the process of focusing.
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