| 摘要 |
PURPOSE:To simplify the construction and to ensure and smoothen the operations by controlling the movement of a lens during a focusing operation with the use of an eccentric operating plane. CONSTITUTION:When a switch SW is turned on through a selecting lever 45, a focus detecting circuit is brought into its operative condition. If, under this condition, a shutter button is depressed, a start member 40 is responsively turned so that a release member 25 is released from its retained condition to rotate. As a result, the arm 25c of the member 25 is moved away to bring a blocking member 29 into its rotatable condition. At the same time, a ratchet wheel 20, which is released from its retained condition by the key portion 25b of the member 25, is turned by the biasing force of a spring so that an eccentric disc 8 is turned through a drive shaft 9. In response to these rotations, a lens holding frame 2 and the lens itself are moved so that a magnet Mg1 is magnetized in response to the focusing signals from the focus detecting circuit. Then, by the repulsive force, the member 29 is moved so that the rotations of the wheel 20 are retained by a retaining pawl 29c to effect the focusing operation. Thus, the shutter is released. Thus, servo- motor can be dispensed with. |
