发明授权
- 专利标题： Automatic exposure controlling device for a camera
- 专利标题（中）： 相机自动曝光控制装置
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申请号： US151058申请日： 1993-11-12
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公开(公告)号： US5452047A公开(公告)日： 1995-09-19
- 发明人: Hidehiko Fujii , Kenji Tsuji , Kenji Ishibashi , Tatsuya Suzuki , Katsuyuki Nanba
- 申请人： Hidehiko Fujii , Kenji Tsuji , Kenji Ishibashi , Tatsuya Suzuki , Katsuyuki Nanba
- 申请人地址： JPX Osaka
- 专利权人： Minolta Camera Kabushiki Kaisha
- 当前专利权人： Minolta Camera Kabushiki Kaisha
- 当前专利权人地址： JPX Osaka
- 优先权： JPX2-200620 19900727
- 主分类号： G03B7/097
- IPC分类号： G03B7/097 ; G03B7/20 ; G03B17/20 ; G03B13/36
摘要：
A device determines an aperture value Av and a time value Tv for controlling exposure, on the basis of the detected focal length, the detected image magnification and brightness of an object. First, a type of photography is determined according to the focal length (f) and a image magnification .beta., on the basis of fuzzy logic. Then, a combination of an aperture value Av and a time value Tv which are proper for the so-determined type of photography is automatically determined. The combination can be changed by a manual operation. If the combination is changed, a display showing a depth of field corresponding to the changed aperture value Av is indicated.