Invention Grant
- Patent Title: Exposure control apparatus for camera
- Patent Title (中): 照相机曝光控制装置
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Application No.: US415179Application Date: 1989-09-29
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Publication No.: US4978990APublication Date: 1990-12-18
- Inventor: Masafumi Yamasaki , Toshiyuki Toyofuku , Junichi Itoh , Shinichi Kodama
- Applicant: Masafumi Yamasaki , Toshiyuki Toyofuku , Junichi Itoh , Shinichi Kodama
- Applicant Address: JPX Tokyo
- Assignee: Olympus Optical Co., Ltd.
- Current Assignee: Olympus Optical Co., Ltd.
- Current Assignee Address: JPX Tokyo
- Priority: JPX63-250464 19881004; JPX63-250467 19881004
- Main IPC: G03B7/091
- IPC: G03B7/091 ; G03B7/099
Abstract:
An optical image of an object is incident on a light-receiving unit of a two-dimensional matrix through a photographing lens. An output from the light-receiving unit is input to a first arithmetic logic unit to calculate an actual object brightness value in consideration of an aperture value of an aperture. An output from the first arithmetic logic unit is input to a multiplexer and a neural network. The neural network determines a main part of the object from brightness value pattern as a set of brightness values of the photoelectric transducer elements and outputs a position signal representing the main part. A multiplexer selectively passes only brightness values of the photoelectric transducer elements corresponding to the main part of the object from the outputs from the first arithmetic logic unit. An output from the multiplexer is supplied to a second arithmetic logic unit, and the second arithmetic logic unit calculates an APEX calculation on the basis of a speed value, an aperture value, a time value, and a mode signal representing a shutter or aperture priority operation, thereby determining a shutter speed or an f-number.
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