| 摘要 |
PURPOSE:To reduce the number of parts and to improve assembling performance by moving and vibrating a focal lens group back and forth through the rotation of a pulse motor. CONSTITUTION:The pulse motor is used for moving and vibrating a focal lens 5. A male screw part is provided on the driving shaft of the pulse motor, while a female screw part is provided on a moving frame 12 integrally formed with the focal lens 5. The male screw part is engaged with the female screw part. The rotation of the driving shaft of the pulse motor moves and vibrates the focal lens back and forth. A restraining means is provided in the vicinity of the driving shaft of the pulse motor to restrain the vibration of the female screw part, which is generated by the frictional force of the male and female screw parts. As a result, the number of parts can be reduced, and the focal lens 5 can be positioned with high accuracy. In addition, the driving shaft of the pulse motor and the restraining means can be assembled simultaneously, which facilitates the assembly. |
