Film sensitivity detecting filter actuating camera

Details Film sensitivity detecting filter actuating camera Film sensitivity detecting filter actuating camera

1977-05-11

1978-08-15

Griffin, Donald A.

354275, G03B 700, G03B 1726

Patent

active

041077032

ABSTRACT:
A camera can use film cassettes which, depending upon the sensitivity of the film they contain, are or are not provided with an external marker. If a cassette with a marker is inserted into the camera the marker deflects a sensing arm so that a projection of the arm moves out of the path of movement of a rack which carries a filter. This permits the spring-biased rack to move to a position in which the filter is located in the path of light impinging upon a light-sensing device of the camera. If a cassette without a marker is inserted the arm is not deflected and its projection extends into the path of movement of the rack and prevents the rack from moving to the aforementioned position, so that the filter cannot move into the light path.

REFERENCES:
patent: 3125939 (1964-03-01), Bundschuh et al.
patent: 3368467 (1968-02-01), Hahn
patent: 3491670 (1970-01-01), Rentschler
patent: 4000497 (1976-12-01), Galbraith
patent: 4003062 (1977-01-01), Galbraith

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