Seikosha Co., Ltd.

Mitsuhiro Kakuta

Kanji Ito

Tomoki Nakamura

Yoichi Seki

Kazuo Akimoto

Hiroyuki Saito

Michio Kawai

Yoshiyuki Iwamatsu

Tomihiko Aoyama

Shinji Miyata

Hiroko Fujita

A photographic camera has a rectilinear approximate operation circuit for calculating characteristic correction data for correcting errors in the operational characteristics of the camera. Predetermined theoretical characteristic data dependent on operational characteristics of the camera are stored. Measured data corresponding to predetermined measured values are stored as individually measured characteristic data in a nonvolatile EEPROM so that the stored measured data can be easily changed by rewriting the EEPROM. An object signal is generated depending on an object to be photographed. The rectilinear approximate operational circuit calculates characteristic correction data from the object signal, the theoretical characteristic data and the measured characteristic data, which is then used for correcting errors in the operation characteristics of the camera.

Device for correcting characteristic errors of a camera

A shutter control device for a camera includes a control arrangement for controlling the opening and closing of the shutter as a function of an exposure value and a diaphragm value. The control arrangement stores values corresponding to a predetermined diaphragm setting, and employs the parameters of the predetermined setting and the exposure value and diaphragm value in order to determine the opening time of the shutter. In another arrangement, the control arrangement determines the effective exposure time as a function of the brightness of the object, distance to the object and a diaphragm, and employs this effective exposure time and a stored correction factor to determine the actual exposure time.

Shutter control device for camera and control method therefor

An exposure control unit for controlling a motor-driven shutter includes an arrangement for interpolating, with linear approximation, between values in an exposure data table, in order to enable finer adjustment of the shutter without increasing the amount of stored table data.

Exposure control unit for a motor-driven shutter

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Tokyo, Japan

Mitsuhiro Kakuta