Motion picture camera

Details Motion picture camera Motion picture camera

1983-08-01

1985-02-12

Griffin, Donald A.

Optics: motion pictures

Camera and/or projector drive mechanisms

With film engaging claws reciprocally driven to engage film

352208, G03B 4104, G03B 910

Patent

active

044987471

ABSTRACT:
A motion picture camera includes a film pull down mechanism and shutter in which film is moved from one frame to the next in a 360.degree. operating cycle made up of a pull down time and a dwell time. The film pull down mechanism is designed to pull the film down in a period less than the dwell time of the film so that film exposure is increased over that occurring when the pull down time and dwell times are equal. The shutter has an opaque sector less than 180.degree. and an open sector greater than 180.degree. responsive to operation of the pull down mechanism to eclipse the film from exposure during the pull down time. The film pull down mechanism further includes a means for varying the length of film pulled down so that film frames of different vertical dimensions can be properly exposed by the same motion picture camera.

REFERENCES:
patent: 1865186 (1932-06-01), Harris
patent: 2052960 (1936-09-01), Berggren
patent: 3168743 (1965-02-01), Nesson
patent: 3736052 (1973-05-01), Lecoeur

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