System and method for transporting film and motion picture...

G - Physics – 03 – B

Patent

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G03B 1/00 (2006.01) G03B 1/22 (2006.01) G03B 1/56 (2006.01)

Patent

CA 2349292

A system and method for transporting film (400) in a motion film projector (100). The system includes a set of film carriages (106) and a set of secondary shutters (120) mounted on a conveyor (104), which continually advances the film carriages (106) and the secondary shutters (120) along a linear path oriented orthogonally with respect to an optical axis (L) of an aperture block (110), through which images on the film (400) are projected. Each film carriage (106) receives a loop of film and then rolls the loop of film in the direction of the aperture block (110). A deceleration mechanism (114) periodically engages and decelerates the film (400). Once the film (400) has been decelerated, a section of the film (400) is temporarily secured in alignment with the aperture block (110) and an image disposed on the film (400) is projected. The conveyor (104) then moves a secondary shutter (120) into alignment with the aperture block (110) to shutter the aperture block (110).

L'invention concerne un système et un procédé de transport de film (400) dans un projecteur de cinéma (100). Le système comprend un ensemble de supports (106) de film et un ensemble d'obturateurs secondaires (120) montés sur un transporteur (104) qui avance en continu les supports (106) de film et les obturateurs secondaires (120) le long d'une trajectoire linéaire orientée orthogonalement à un axe optique (L) d'un bloc d'ouverture (110), à travers lequel les images du film (400) sont projetées. Chaque support (106) de film reçoit une boucle de film qu'il déroule dans la direction du bloc d'ouverture (110). Un mécanisme de décélération (114) met en prise et décélère périodiquement le film (400). Une fois le film (400) décéléré, une section du film (400) est temporairement fixée alignée avec le bloc d'ouverture (110) et une image du film (400) est projetée. Le transporteur (104) déplace ensuite un obturateur secondaire (120) en alignement avec le bloc d'ouverture (110) pour fermer le bloc d'ouverture (110).

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