Slide projector control device

Details Slide projector control device Slide projector control device

1974-08-01

1976-04-20

Haroian, Harry N.

Optics: image projectors

Lamp control

G03D 2120

Patent

active

039515370

ABSTRACT:
The lamps of two slide projectors are each supplied by the secondary winding of a transformer. Each secondary winding has a half-wave rectifier and a current-control element in series with its lamp. Terminals are provided for bridging the rectifier and current-control element to enable each projector to be used separately. The two secondary windings and rectifier can also be connected to form a full-wave rectifying unit with a median terminal feeding the two lamps each in series with its current-control element, to enable projection of a series of slides with simultaneous fading-in and fading-out of successive slides.

REFERENCES:
patent: 3282155 (1966-11-01), Cleary et al.
patent: 3544210 (1970-12-01), Goetz
patent: 3622236 (1971-11-01), Novy

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