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1. WO2000022480 - FILM PROJECTOR USING INDEPENDENTLY CONTROLLED STEPPER MOTORS

Publication Number WO/2000/022480
Publication Date 20.04.2000
International Application No. PCT/US1999/023470
International Filing Date 07.10.1999
Chapter 2 Demand Filed 02.05.2000
IPC
G03B 21/48 2006.1
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
21Projectors or projection-type viewers; Accessories therefor
14Details
32Details specially adapted for motion-picture projection
43Driving mechanisms
44Mechanisms transmitting motion to film-strip feed; Mechanical linking of shutter and intermittent feed
48for altering frame speed; for regulating constancy of film speed
CPC
G03B 21/48
GPHYSICS
03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
21Projectors or projection-type viewers; Accessories therefor
14Details
32Details specially adapted for motion-picture projection
43Driving mechanisms
44Mechanisms transmitting motion to film-strip feed; Mechanical linking of shutter and intermittent feed
48for altering frame speed; for regulating constancy of film speed
Applicants
  • CFS/RENTEC, INC. DBA CINEMA FILM SYSTEMS [US]/[US]
Inventors
  • NICCUM, Richard, Evan
  • STALL, David, K.
Agents
  • ALTMAN, Daniel, E.
Priority Data
09/395,48314.09.1999US
60/104,24414.10.1998US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) FILM PROJECTOR USING INDEPENDENTLY CONTROLLED STEPPER MOTORS
(FR) PROJECTEUR DE FILMS UTILISANT DES MOTEURS PAS A PAS COMMANDES INDEPENDAMMENT
Abstract
(EN) In a film projector (200), two or more stepper motor-driven systems are synchronized using a microprocessor (500) which provides speed and synchronization information to the stepper motors (240, 280, 281, 290, 291, 292). The invention is particularly applicable to a professional motion picture film projector (200) in which a film (250) passes through a projector (200) and is driven by a plurality of independently controlled but synchronized stepper motors (240, 280, 281, 290, 292). By independently controlling the stepper motors (240, 280, 281, 290, 292), the invention is not only able to control the speed at which the film (250) is progressed, but it is also able to control the various loop (251, 252) sizes and shutter speeds necessary to adjust the projector (200) while it is in operation.
(FR) Selon cette invention, dans un projecteur de films (200) on synchronise deux ou plusieurs systèmes entraînés par des moteurs pas à pas au moyen d'un microprocesseur (500) qui fournit des données sur la vitesse et la synchronisation aux moteurs pas à pas (240, 280, 281, 290, 291, 292). L'invention peut notamment s'appliquer à un projecteur professionnel de films cinématographiques (200) dans lequel un film (250) passe à travers un projecteur (200) tout en étant entraîné par plusieurs moteurs pas à pas commandés indépendamment mais synchronisés (240, 280, 281, 290, 292). En commandant de façon indépendante les moteurs pas à pas (240, 280, 281, 290, 292), on peut, selon l'invention, réguler non seulement la vitesse de défilement du film (250) mais aussi différentes dimensions de boucles (251, 252) et la vitesse d'obturation, qui sont nécessaires pour régler le projecteur (200) pendant le fonctionnement.
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