公开(公告)号：US4458997A

公开(公告)日：1984-07-10

申请号：US261948

申请日：1981-05-08

申请人： Kazuhisa Aratame ,  Saburo Yoneyama ,  Yasutsugu Nakagawa ,  Kunio Nakajima

发明人： Kazuhisa Aratame ,  Saburo Yoneyama ,  Yasutsugu Nakagawa ,  Kunio Nakajima

IPC分类号： G03B17/02 ,  G03B17/20 ,  G03B19/12 ,  G03B17/18

CPC分类号： G03B19/12 ,  G03B17/20

摘要： A single lens reflex camera is provided with a photocell so positioned in the camera as to receive thereon light incident through the lens and reflected onto the photocell by the mirror. During each photographing operation, the mirror is pivotally elevated so that the incident light is no longer received by the photocell. The camera electronics monitors the photocell output which is representative of the magnitude of light received by the photocell and, unless a relatively rapid change in photocell output is detected during a photographing operation, an alarm is actuated to indicate failure of the mirror to properly pivot.

摘要翻译： 单个镜头反光相机设置有光电池，其定位在相机中以便在其上接收通过透镜入射的光并通过反射镜反射到光电池上。 在每次拍摄操作期间，镜子被枢转地升高，使得入射光不再被光电池接收。 相机电子设备监控光电管输出，其代表由光电池接收的光的大小，并且除非在拍摄操作期间检测到光电池输出的相对快速的变化，否则启动报警以指示反射镜的故障正确枢转。