Photographic camera with automatically controlled filter

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

1975-05-19

1976-08-31

Peters, Jr., Joseph F.

Optics: motion pictures

Removable film strip magazine type

352141, 354152, 354271, G03B 708, G03B 900

Patent

active

039784975

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 start and stop of the filter operating member is controlled by a start controlling electromagnet and a stop controlling electromagnet which are controlled by an electric circuit connected with a light measuring circuit including a photodetector to measure the scene brightness.

REFERENCES:
patent: 3209667 (1965-10-01), Coutant
patent: 3538335 (1970-11-01), Tartanian
patent: 3732793 (1973-05-01), Tague

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