Exposure control device

Details Exposure control device Exposure control device

Filed on

1975-12-24

Date issued

1978-09-05

Examiner

Adams, Russell E.

Other Related Categories

354 37, 354 38, G03B 708

Type

Patent

Status

active

Patent number

041124413

Description

ABSTRACT:
An automatic exposure control device for a camera capable of aperture preferred (ES), shutter preferred (EE), and programmed (ES-EE) operation. Transducers and log compression electronic devices develop voltages dependent upon the Bv, Sv, Av and Tv values either manually or automatically set in the camera. Other circuit means adds and subtracts the voltages to satisfy the equation Bv + Sv = Av + Tv, and to thereby generate either Av, Tv or both, depending on the mode of operation. A diaphragm control apparatus is connected to respond to the circuit in dependence upon the values Tv, Bv and Sv during the EE and ES-EE modes. During the latter mode the Tv set into the circuit will not necessarily be the same Tv satisfying the equation above. During the ES mode the shutter speed is controlled in dependence upon the values Bv, Sv and Av.

REFERENCES:
patent: 3554104 (1971-01-01), Winkler et al.
patent: 3638544 (1972-02-01), Kitai
patent: 3829867 (1974-08-01), Ono
patent: 3863263 (1975-01-01), Itagaki
patent: 3896456 (1975-07-01), Toyoda
patent: 3896460 (1975-07-01), Sahara et al.
patent: 3945024 (1976-03-01), Hasegawa et al.
patent: 3950765 (1976-04-01), Nanba et al.
patent: 3964073 (1976-06-01), Korbori et al.

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