| 摘要 |
PURPOSE:To execute a focusing operation in a short time in both far and near directions by holding a control member turned by a movable coil member in a balanced state that it is not turned to the right nor the left, at the time of non- operation. CONSTITUTION:In case a signal for moving a photographic lens forward or backward by one step is outputted, a coil is electrified in such a direction as the second movable coil member moves to the right, therefore, a movable cam member 21 is turned by a prescribed angle clockwise by an action of a pin 8c. Subsequently, the coil is electrified in such a direction as the first movable coil member moves to the left, therefore, a pin 7b of the first movable coil member abuts on a cam surface 25b of a cam part 25 and stops, and a lens is stopped. Next, photographing is ended and an electrification to the second movable coil member is released, and also when an electrification to the first movable coil member is executed in the direction opposite to the time of focusing, an energizing force which has moved the second movable coil member annihilates. As a result, the member 21 is restored to a balanced state by a repelling force of a torsion spring 23. |
