Film transport mechanism

Details Film transport mechanism Film transport mechanism

B - Operations, Transporting

65

H

B65H 27/00 (2006.01) B65H 20/24 (2006.01) B65H 23/04 (2006.01) G03B 1/18 (2006.01) G03B 1/42 (2006.01)

Patent

CA 2253596

A compact rolling loop motion picture projector has a rotor of significantly smaller diameter than a conventional such rotor. The radius of curvature of the rotor is selected to be significantly less than the radius of curvature of a film flattener element on which the film is located for projection, and the axis of rotation of the rotor is offset towards a film input sprocket of the projector so as to maintain a minimum film gap between the rotor and the field flattener usptream of the optical axis of the projector. The compact rotor is rotationally supported from above by a "spider" and a projection lamp is located below the rotor for compactness and efficiency of lamp operation.

Un projecteur cinématographique à boucle déroulante comporte un rotor dont le diamètre est significativement plus petit que celui d'un rotor traditionnel. Le rayon de courbure du rotor est sélectionné pour être significativement inférieur à celui du rayon de courbure d'une lentille d'égalisation de champ sur laquelle est placé le film en vue de la projection. L'axe de rotation du rotor est décalé en direction d'une dent de pignon d'entrée de film du projecteur, de manière à maintenir un espace minimal entre le rotor et la lentille en amont de l'axe optique du projecteur. Le rotor compact est supporté en rotation depuis le dessus par un système en étoile et une lampe de projection est placée en dessous du rotor pour assurer la compacité et l'efficacité du fonctionnement de la lampe.

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