| 摘要 |
PURPOSE:To improve the workability and to save a space by decreasing the number of armatures of a switch, by providing the first switch for driving a motor, and the second switch which is turned on and off by interlocking with a member for moving by switching a focus, so that the first switch sets the motor to a driving state when the focus is being switched by a member for detecting a focus switching state, and stops the motor after the switching has been ended. CONSTITUTION:The first switch 14 is provided with an armature 14a and an armature 14b, turned on by a contact of the armatures 14a, 14b and makes a motor 1 execute an electric conduction in the reverse rotational direction being a clockwise direction. The second switch, a detecting switch 26 is provided with an armature 26a and an armature 26b, and turned on by a contact of two armatures, when a lens barrel 21b has been put in by an end face 30a of a guide bar 30 which moves forward and backward with advance and retreat of the lens barrel 21b. That is, it is a switch for discriminating by on and off whether an optical system is in a focal distance and an F-number which have been shifted at present or not, and mainly transfers information to an exposure control focusing and display system, etc.
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