发明授权
- 专利标题： Exposure computation circuit
- 专利标题（中）： 曝光计算电路
-
申请号： US746205申请日： 1976-12-01
-
公开(公告)号： US4139289A公开(公告)日： 1979-02-13
- 发明人: Sadao Yamada , Isao Arita , Tadashi Ito , Soichi Nakamoto
- 申请人： Sadao Yamada , Isao Arita , Tadashi Ito , Soichi Nakamoto
- 申请人地址： JPX Kanagawa JPX Kanagawa
- 专利权人： Canon Kabushiki Kaisha,Tokyo Shibaura Electric Co., Ltd.
- 当前专利权人： Canon Kabushiki Kaisha,Tokyo Shibaura Electric Co., Ltd.
- 当前专利权人地址： JPX Kanagawa JPX Kanagawa
- 优先权： JPX48-125735 19731108; JPX48-128652 19731115
- 主分类号： G03B7/093
- IPC分类号： G03B7/093 ; G03B7/08
摘要：
The present invention relates to an exposure computation circuit by means of which a computation is carried out with the values inversely proportional to all the exposure factors excepting the diaphragm value of the APEX system so as to obtain computation results in proportional relation with the actual shutter time value or the actual diaphragm value in order to control the exposure basing upon the computation results.