LENS SHUTTER DRIVING MECHANISM USED ALSO AS LENS DRIVING MECHANISM

摘要

PURPOSE: To improve a mechanism for driving a lens and a shutter blade where a step motor is used as a driving source. ;CONSTITUTION: When a main driving member 4 connected to the motor 1 is rotated counterclockwise, a lens driving member 5 connected to the lens is rotated counterclockwise in a state where its step part 5d is engaged with a pin 4a. At such a time, a recessed cam 4g passes a cam follower 7b, and the clockwise rotation of the cam follower 7b is regulated by the cam edge 5f of the member 5, and the clockwise rotation thereof is regulated by the cam edge 4f after the member 5 is rotated counterclockwise. When the member 4 is rotated clockwise by engaging with a ratchet 5a at a focusing position, the cam follower 7b is released from the cm edge 5f at such a time, so that the cam follower 7b falls in the recessed cam 4g from a cam edge 4f, and an opening and closing member 7 is rotated clockwise. Therefore, the opening and closing lever 7 is actuated only in the case of the initial restoration of a main driving member even when a one-way clutch is not provided.;COPYRIGHT: (C)1993,JPO&Japio