Exposure control device for a camera

Details Exposure control device for a camera Exposure control device for a camera

1978-06-20

1979-12-04

Hix, L. T.

354 31, 354 49, 354128, 354152, G03B 708, G03B 1505, G03B 1912

Patent

active

041769295

ABSTRACT:
An exposure control device for a camera, having a first light receiving element for sensing light beams reflected from a film surface and a second light receiving element for sensing light beams from an object before taking a photograph. In this arrangement an auxiliary diaphragm, which is opened as a shutter is closed and is closed as the shutter is opened, is provided in front of the second light receiving element. The first and second light receiving elements are connected in parallel between input terminals of an operational amplifier for the light measuring. Accordingly, an exposure control with a high degree of accuracy is effected based on an output of the light measuring operational amplifier.

REFERENCES:
patent: 3470798 (1969-10-01), Miyakawa
patent: 3860936 (1975-01-01), Harvey
patent: 3864699 (1975-02-01), Tsunekawa et al.
patent: 3889276 (1975-06-01), Shirai
patent: 4040111 (1977-08-01), Lindner et al.
patent: 4065777 (1977-12-01), Maitani et al.
patent: 4072961 (1978-02-01), Yamada
patent: 4076977 (1978-02-01), Tsunekawa et al.
Sharp Semiconductor Technical Manual, `Application to Cameras`, Mar. 1974, pp. 6 & 11.

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