Method and circuit arrangement for the automatic determination o

Details Method and circuit arrangement for the automatic determination o Method and circuit arrangement for the automatic determination o

1986-12-02

1987-12-15

Adams, Russell E.

354425, 354459, 354460, G03B 708

Patent

active

047129034

ABSTRACT:
A method and a circuit arrangement for photographic cameras for automatic determination of the exposure value by means of electrical signals obtained from integrated and selective brightness measurements of the object to be exposed. A difference value is formed, for the exposure control, in a manner which is known per se, from the comparison of an electrical signal value derived from the selective metering with an electrical signal value generated from the integrated metering. A correction value is determined from the comparison of the difference value with a threshold value. The correction value is set off against the electrical signal value generated from the integrated metering, and the value resulting from the setoff is used for exposure control of the camera.

REFERENCES:
patent: 4289389 (1981-09-01), Kobori et al.
patent: 4349255 (1982-09-01), Takayama
patent: 4391500 (1983-07-01), Tsunekawa
patent: 4453811 (1984-06-01), Yamasaki
patent: 4455069 (1984-06-01), Kawamura
patent: 4456353 (1984-06-01), Mizokami
patent: 4480902 (1984-11-01), Kawamura
patent: 4492858 (1985-01-01), Mizokami

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