公开(公告)号：US3777637A

公开(公告)日：1973-12-11

申请号：US3777637D

申请日：1972-05-18

Applicant: MINOLTA CAMERA KK

Inventor： KURAMOTO Y ,  TJUJIMOTO K ,  UEDA H

IPC: G03B7/085 ,  G03B7/08 ,  G03B9/06

CPC classification number: G03B7/085

Abstract: An automatic exposure control device for a photographic camera provided with an exposure control circuit including a light receiving element receiving the scene light passing through an objective lens and a diaphragm, and operating in accordance with photographic conditions such as the generated current of said light receiving element, the set shutter speed and the set film sensitivity in the camera, an electromagnetic coil whose magnetic field varies according to the output of said exposure controlling circuit, and a retaining member retaining the diaphragm in a fully open state so biased that the aperture will be reduced from its fully open condition. While closing the switch of the exposure controlling circuit prior to the shutter is initiated for actuating the exposure controlling circuit, releasing the retaining member thereby causes the diaphragm to start reducing the aperture size and when the brightness of the scene light passing through said objective lens and the diaphragm becomes the correct value with respect to the set shutter speed and the set film sensitivity, the diaphragm aperture is prevented from being reduced according to the variation of the magnetic field of said electromagnetic coil for controlling the diaphragm aperture.

Abstract translation: 一种用于照相机的自动曝光控制装置，其设置有曝光控制电路，该曝光控制电路包括接收通过物镜和光阑的场景光的光接收元件，并且根据诸如所述光接收元件的产生电流 ，相机中设定的快门速度和设定的胶片感光度，其磁场根据所述曝光控制电路的输出而变化的电磁线圈以及将隔膜保持在完全打开状态的保持构件，使得该孔将为 从完全开放状态减少。 在启动快门之前关闭曝光控制电路的开关以致动曝光控制电路的同时，释放保持构件，从而使得光阑开始减小光圈尺寸，并且当通过所述物镜的场景光的亮度和 相对于设定的快门速度和设定的胶片感光度，光阑成为正确的值，根据用于控制光阑孔径的所述电磁线圈的磁场的变化，防止光阑孔径减小。