Photographic film projection dissolve system for arc lamp projec

Details Photographic film projection dissolve system for arc lamp projec Photographic film projection dissolve system for arc lamp projec

1977-12-14

1979-06-19

Stephan, Steven L.

Optics: image projectors

Shutter

Plural projection paths

310 29, 350269, 353 93, G05D 2500, G03B 2114

Patent

active

041584910

ABSTRACT:
A photographic film projection system includes a plurality of projectors, one of which is an arc lamp projector, and a dissolver instrument whose controlled output power to the arc lamp projector is a phase controlled average a.c. power. The arc lamp projector has a light valve comprising a motor means linearly responsive to average power, for example, a moving iron galvanometer, and a movable means, such as a louvre, positioned between the arc lamp and the film gate.

REFERENCES:
patent: 837942 (1906-12-01), Martincourt
patent: 887839 (1908-05-01), Patterson
patent: 2031361 (1936-02-01), Bowen
patent: 3447111 (1969-05-01), Coakley et al.
patent: 3514191 (1970-05-01), Hoskin
patent: 3922081 (1975-11-01), Uchido et al.

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