Reversing film projection system

Details Reversing film projection system Reversing film projection system

1995-06-09

1996-12-03

Metjahic, Safet

Optics: motion pictures

With rewinding of film strips

During projection of another film strip

352 83, 352123, 352239, G03B 100, G03B 2132, G03B 2100

Patent

active

055813135

ABSTRACT:
The reversing film projection system employs film having images printed substantially side-by-side to allow presentation of one set of images in a forward direction and the adjacent images in rearward direction by moving the projection head and associated aperture plate and film guide laterally with respect to the lens and lamp house for display of the film images. In a first forward drive position, the projector motor drives the film in a forward direction with a first aperture of the aperture plate and associated first set of film images aligned with the optical train. Upon completion of the image presentation in the forward direction, the projection head is displaced laterally aligning a second aperture in the aperture plate and the associated second set of film images with the optical train, with the projection motor engaged in a reversed direction. Actuators for motion of the projection head, dowser controls and film transport drive are microprocessor controlled employing absolute frame count for various film presentations.

REFERENCES:
patent: 961536 (1908-12-01), Roebuck
patent: 1112270 (1914-09-01), Currie
patent: 1485907 (1921-04-01), Brown
patent: 1801061 (1927-01-01), Thornton
patent: 3471223 (1966-05-01), Langone
patent: 3792919 (1974-02-01), Holmes et al.
patent: 3937567 (1976-02-01), Thomas et al.
patent: 4150886 (1979-04-01), Merkel et al.

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