Automatic exposure control device in a camera

Details Automatic exposure control device in a camera Automatic exposure control device in a camera

1975-10-24

1978-02-21

Adams, Russell E.

354 24, 354 37, 354 60R, 354 60A, G03B 708

Patent

active

040756416

ABSTRACT:
An automatic iris adjustment control for cameras which, using the APEX operational equations, compares the brightness value Bv and film sensitivity value Sv with the iris size indication value Av and shutter speed value Tv. The iris size indicating value Av is derived from the sum of pulses created by a pulse generator which operates in conjunction with the moving adjustment of the iris size. When the values are compared and found equal, an electro-magnet is de-energized stopping the movement of the adjustable iris at the correct iris setting.

REFERENCES:
patent: 3798661 (1974-03-01), Taguchi
patent: 3863263 (1975-01-01), Itagaki

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