Exposure control device for camera

Abstract

Abstract PURPOSE: To obtain always exposure by correcting the exposure control errors owing to the differences in the reflectivities of a film face based on photometric output. CONSTITUTION: A comparator 28 which compares the output of a photometric integrating circuit 24 including a photodetector 12 receiving the reflected light from a shutter curtain plane and a film plane and the prescribed output of a reference voltage circuit 54 is provided, and when both outputs attain a prescribed relation, exposure is ended. In this case, a subtractor 50 which operates the difference between the photometric output X corresponding to the output from the photodetector 12 and the output Y delaying 48 said output X by a prescribed time, and an integrating circuit 52 which outputs correction voltage by integrating the subtracted output F are provided, and the correction voltage as reference voltage H is introduced into the comparator 28, whereby the exposure control errors owing to the difference in the reflectivities of the film face are corrected. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Kazuo Kimura

Bibliographic Details