Switchable pulldown film projection system

Details Switchable pulldown film projection system Switchable pulldown film projection system

G - Physics

03

B

G03B 1/24 (2006.01) G03B 21/48 (2006.01)

Patent

CA 2244260

A switchable pulldown film projection system comprising a film transport system (10) for transporting film (12) through a projector (14). The film transport system (10) has a plurality of sprockets (22, 24 and 28) teeth for engaging perforations (56) on the film (12), and a pair of motors (30 and 32) that rotate the sprockets (22, 24 and 28) and move the film (12) in a frame-by-frame manner with respect to an aperture (29) in the projector (14). The motors (30 and 32) are controlled by an electronic controller (94) that changes the rotational output of the motors (30 and 32) based on a signal (104) related to the format of the film (12) in terms of the number of perforations (56) spanned by each frame (58) on the film (12). The controller (94) enables the system (16) to switch between a variety of different film formats, on the same projector (14) and on the same strip of film (12), without substantially interrupting or delaying operation of the projector (14).

L'invention porte sur un système de projection à pas d'avancement réglable comprenant un dispositif de transport (10) faisant défiler le film (12) devant un projecteur (14) et comportant plusieurs roues dentées (22, 24, 28) s'engageant dans les perforations (56) du film (12) et deux moteurs (30, 32) d'entraînement des roues dentées (22, 24, 28) faisant défiler le film (12) image par image face à la fenêtre (29) du projecteur (14). Les moteurs (30, 32) sont commandés par un régulateur électronique (94) qui fait varier leur vitesse de rotation sur la base d'un signal lié au (104) format du film (12) en fonction du nombre de perforations (56) par image (58). Le régulateur (94) permet de commuter le système (16) sur différents formats de film en utilisant le même projecteur et la même pellicule sans pratiquement interrompre ou retarder la projection.

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