| 摘要 |
PURPOSE:To position the optical member securely, by providing auxiliary power forming means and elastic means which accumulate and release force alternately. CONSTITUTION:Coil springs 41, 44 are assembled to link plates 37, 40, 42 which are intended to move a moving base 23 on which is secured a supporting base 22 fastening the lens-barrel B of a lens 16, reciprocally along guides 24, 25, and a return spring 59 to enforce a stopping plate 51 is provided. In this setting, when a variable power button is depressed, a solenoid 50 is ebergized, and the stopping plate 51 turns down, and a driving motor 27 rotates to rotate a rotation driving plate 32 through a unidirectional rotation clutch 34, so that magnets 491, 492 confront one of Hall elements 46-48 successively to issue stop signals for solenoid 50 and motor 27 sequentially. In consequence, the stopping plate 51 turns back due to action of the return spring 59, and a roller 56 is pressed down into one of stepped parts 53-55 due to action of the coil springs 41, 44, so that the lens 16 may be stopped exactly at a specified position. |
