Optics: motion pictures – Camera and/or projector drive mechanisms – With speed regulation or selection
Patent
1996-02-07
1999-08-31
Gray, David M.
Optics: motion pictures
Camera and/or projector drive mechanisms
With speed regulation or selection
352187, G03B 2148
Patent
active
059460768
ABSTRACT:
A switchable pulldown film projection system comprising a film transport system for transporting film through a projector. The film transport system has a plurality of sprockets with teeth for engaging perforations on the film, and a pair of motors that rotate the sprockets and move the film in a frame-by-frame manner past an aperture in the projector. The motors are controlled by an electronic controller that changes the rotational output of the motors based on a signal related to the format of the film in terms of the number of perforations spanned by each frame on the film. The controller enables the system to switch between a variety of different film formats, on the same projector and on the same strip of film, without substantially interrupting or delaying operation of the projector.
REFERENCES:
patent: 1318610 (1919-10-01), Sereinsky
patent: 1835743 (1931-12-01), Aster
patent: 1921494 (1933-08-01), Wildhaber
patent: 1999754 (1935-04-01), Evans
patent: 2079572 (1937-05-01), Kiel
patent: 3285087 (1966-11-01), Wells
patent: 3565521 (1971-02-01), Butler et al.
patent: 3741636 (1973-06-01), Nakayama
patent: 3819258 (1974-06-01), Butler et al.
patent: 3865738 (1975-02-01), Lente
patent: 4105311 (1978-08-01), Boudouris
patent: 4120572 (1978-10-01), Grallert et al.
patent: 4143951 (1979-03-01), Suzaki et al.
patent: 4150886 (1979-04-01), Merkel et al.
patent: 4360254 (1982-11-01), Nyman et al.
patent: 4437742 (1984-03-01), Taniguchi
patent: 4678298 (1987-07-01), Perisic
patent: 4697896 (1987-10-01), Fox
patent: 4702577 (1987-10-01), Weigert
patent: 4893921 (1990-01-01), Beauviala
patent: 4900293 (1990-02-01), McLendon
patent: 5096286 (1992-03-01), Weisgerber
patent: 5218388 (1993-06-01), Purdy
patent: 5312304 (1994-05-01), Vetter
patent: 5341182 (1994-08-01), Schmidt
patent: 5506639 (1996-04-01), Frazen et al.
patent: 5534954 (1996-07-01), Vetter
patent: 5537147 (1996-07-01), Washino et al.
patent: 5537165 (1996-07-01), Miyamori et al.
patent: 5539527 (1996-07-01), Kajimoto et al.
patent: 5543869 (1996-08-01), Vetter
patent: 5739895 (1998-04-01), Vetter
"Too Costly for Prime Time", L.A. Times (Mar. 22, 1992).
"Editing a Whirlwind for `Christmas`", Daily Variety Special Report (Mar. 16, 1992).
"Electronic Editing with Dean Goodhill", Editors Guild Newsletter (Winter 1992).
"You Want a Whole Movie by When?", Calendar (undated).
"New Clairmont Super 1.85: 32% More Image Area . . . ", advertisement (undated).
"Three-Perf Technology: Tomorrow's Film Format--Today", International Photographer (Oct. 1987).
"Step Printers", Optical Printers, etc. (circa 1950).
"Film Pulldown Mechanism Based on a Design by Samuel B. Grimson", SMPTE vol. 67.
"The Radial-Tooth, Variable-Pitch Sprocket", SMPTE vol. 57.
Edmund M. Digiulio, SMPTE Study Group on 30-Frame Film Rate: Final committee Report on the Feasibility of Motion-Picture Frame-Rate Modication to 30 Frames/sec, SMPTE Journal, pp. 404-408, May 1988.
SMPTE Journal 102 (1993) Aug., No. 8, Motion Picture Prints--Projectable Image Area.
SMPTE Journal 104 (1995) May, No. 5, Prints Made on Continuous Contact Printers--Exposed Areas for Picture and Audio.
Behrns Don P.
Goodhill Dean K.
Gray David M.
MaxiVision Cinema Technology
LandOfFree
Switchable pulldown film projection system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switchable pulldown film projection system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switchable pulldown film projection system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2427664