Light measuring circuit for automatic exposure control

Details Light measuring circuit for automatic exposure control Light measuring circuit for automatic exposure control

1976-08-05

1978-02-07

Adams, Russell E.

354 31, 354 51, 354 60R, G03B 708

Patent

active

040729613

ABSTRACT:
Light measuring circuit for camera automatic exposure control measures scene light passing through the objective and reflected at the film surface and/or the shutter curtain surface located at the exposre aperture of the camera. The measuring circuit is provided with a compensating circuit for compensating the light responsive output for the difference of light reflecting power of the surfaces of the film and the shutter curtain. The compensating circuit is actuated in a predetermined timing relationship with the travel of a shutter curtain.

REFERENCES:
patent: 3730063 (1973-05-01), Kobayashi et al.
patent: 3842424 (1974-10-01), Tsunekawa et al.
patent: 3864699 (1975-02-01), Tsunekawa et al.
patent: 3994001 (1976-11-01), Maitani et al.

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