| 摘要 |
PURPOSE:To position accurately a lens at the position corresponding to selected magnification by driving the 1st cam with which a moving member is coupled and the 2nd cam with which an energizing member is coupled through a common driving source, and positioning a lens base by a positioning member which is energized elastically. CONSTITUTION:A cam lever 38 which moves associatively with a moving lever 41 for moving the lens base 44 is coupled with a cam ring 35 by a guide pin 39 through a cam groove 36, and one terminal of a lever 47 which engages and holds the lens base 44 at a selected magnification position is energized while coupled with the cam of the cam ring 35 through a tensile spring 54 and the pin of an oscillatory lever 55. Then when the cam ring 35 rotates, the spring 54 is relaxed with the pin firstly and the lens base 44 is moved by a pin 39 through a moving lever 41, and then the spring 54 is pulled with the pin to hold the roll 46 of the lens base at the position corresponding to the selected magnification. |
