Photographic camera with automatically controlled filter

Details Photographic camera with automatically controlled filter Photographic camera with automatically controlled filter

1975-09-17

1977-08-02

Adams, Russell E.

354 53, 354 59, 354 60L, G03B 708

Patent

active

040400670

ABSTRACT:
An optical filter the density of which is variable is provided in the optical path of the taking lens. The density of the filter is controlled to effect optimum exposure with freely selected aperture size and the shutter speed by means of an exposure control circuit. The density of the filter is varied by moving a filter operating member which is driven by a filter driving means. The stroke of the filter operating member is controlled by means operated by electric pulses supplied by an electric circuit connected with a light measuring circuit including a photodetector to measure the scene brightness. The electric circuit for supplying the pulses for controlling the filter includes exposure factor input means and an arithmetic unit employing logic circuits.

REFERENCES:
patent: 2351932 (1944-06-01), Deckel et al.
patent: 2825271 (1958-04-01), McKae
patent: 3433139 (1969-03-01), Beyen et al.
patent: 3732793 (1973-05-01), Tague
patent: 3815982 (1974-06-01), Wagensonner
patent: 3896455 (1975-07-01), Steinbatz
patent: 3928858 (1975-12-01), Sakurada et al.

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