| 摘要 |
PURPOSE:To shorten a variable power operation time and facilitate control by providing a driving control means which moves a main lens to a specific position corresponding to selected magnification and a click member provided to a carriage where the main lens is assembled. CONSTITUTION:The driving wire to which the carriage 13 for holding the main lens 1 is fixed is wound between a driving pulley 16 and a guide pulley 17, and the carriage 13 is moved along a couple of guide rods 18 extended in parallel to the optical axis of the main lens. Then, a speed reduction sensor 21 for detecting the speed reduction starting point of the main lens 1 in movement is operated with a tongue piece 23 extending upward from the click plate 22 fixed to the carriage 13. Consequently, the time of variable power operation is shortened and the control is facilitated. |
