| 摘要 |
PURPOSE:To move a movable barrel holding a photographic lens smoothly along a guide member which holds the movable barrel, by applying a driving force for the movable barrel onto the axial line of the guide member or near it. CONSTITUTION:When a cam driving gear 24 is turned by rotation of a motor, a cam driving pin 24c is brought into contact with a right face 61c of a plate cam 61 to turn this plae cam 61 counterclockwise around a cam shaft 62, and therefore, a driving pin 9 is moved left, and a movable barrel part is fed out left. When the motor is rotated in the reverse direction, the cam driving gear 24 is turned in the reverse direction, and therefore, the driving pin 24c is brought into contact with a left face 61d to move the driving pin 9 right. Since a press spring 65 presses and charges the pin 9 at this movement time, the movable barrel part is stably moved freely forward and backward. A fine adjustment screw 68 may be set to a camera body to adjust finely deformation of the plate cam 61 itself and the gap between the plate cam 61 and the cam shaft 62. |
