| 摘要 |
PURPOSE:To make setting of a maximum aperture position and the determination of an aperture position owing to aperture information possible by providing an aperture value setting member which is normally energized in a minimum diameter direction, a maximum diameter position setting mechanism which brings the revolution of a motor to the maximum diameter position, etc. CONSTITUTION:An aperture value setting member has a stopping-down lever 10, a rack part 14 provided in one body to this, and a ratchet gear 12, and is movable in right and left directions. A spring 9 is put on between the lever 10 and a plate, and is held normally energized in the left direction in the figure. A maximum bore position setting mechanism is connected to a motor 22 via a gear train 1 in such a manner that the revolution in the 1st direction of a motor 22 is transmitted in the direction shown by the arrow I of a gear 2. With such constitution, the setting of the maximum aperture position by making use of the built-in motor and the determining of the aperture position by aperture information are possible. |
