Pressure plates for cinematograph projectors

Details Pressure plates for cinematograph projectors Pressure plates for cinematograph projectors

G - Physics

03

B

88/80

G03B 21/32 (2006.01) G03B 1/48 (2006.01)

Patent

CA 1075941

ABSTRACT OF THE DISCLOSURE In a cinematographic film projector, there is provided at the film gate an apertured pressure plate which presses the film against a film guide. When the film is arrested in the film gate to project a stationary image formed by one film frame, heat emitted from the light source tends to buckle the film causing distortion of the image. To overcome or reduce buckling in these circumstances, the pressure plate is provided with a transparent member extending across the aperture in the pressure plate to present to the film within the area of the aperture a film contacting surface which opposes buckling of the film within the area of the aperture.

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