| 摘要 |
PURPOSE:To perform the aperture control without control error, by determining the reference position of a lens-side aperture by a stopper and using the position of a camera-side aperture lever engaged with the stopper as the start point to detect the extent of movement. CONSTITUTION:A lens-side aperture lever 20, a spring 21, and a stopper 20 are provided in the lens side, and the spring 21 charges the lever 20 to the left to make the aperture small. When a lens is mounted on a camera, the lens-side aperture lever 20 is brought into contact with a bending part 1c of a camera- side aperture lever 1 and is energyized by a spring 3 and is displaced to the side of opening. The movement of the lever 20 is stopped by a stopper 22, and in this state, the camera-side aperture lever 1 is displaced to the left slightly to complete mounting of the lens. The stopper 20 is placed a certain length to the right of the position of lens opening; and in the camera side, the position to which the lever 1 is displaced by the stopper 22 is used as a reference position to control the quantity of stop-down. Consequently, the aperture control of less control error is performed. |
