公开(公告)号：US4035634A

公开(公告)日：1977-07-12

申请号：US627916

申请日：1975-10-31

Applicant: Saburo Numata

Inventor： Saburo Numata

IPC: H01J40/14 ,  H01J39/12

CPC classification number: H01J40/14

Abstract: A pair of photocells having substantially the same characteristics and directly connected in opposite relation to each other are used as a light receptor device which gives photometric input to the exposure control unit or regulator in a camera. According to this arrangement, the composite illuminance-output characteristic provided by the pair of photocells diverges from the usual proportional relation in the high illuminance range, and this feature is advantageously utilized for iris stops in cameras.

Abstract translation: 具有基本上相同特性并且彼此相对关系直接连接的一对光电管被用作向相机中的曝光控制单元或调节器进行光度输入的光接收装置。 根据该结构，由一对光电管提供的复合照度 - 输出特性在高照度范围内从通常的比例关系发散，并且该特征有利地用于相机中的虹膜停止。