Apparatus for controlling slide projectors

Details Apparatus for controlling slide projectors Apparatus for controlling slide projectors

1974-05-31

1976-05-25

Aegerter, Richard E.

Optics: image projectors

Lamp control

Dissolve type

G03B 2120, G03B 2316

Patent

active

039588750

ABSTRACT:
The invention uses frequency control of lamps and magazines in projectors and is especially adapted for programmed control by recording the frequency signals produced by previous rehearsal of the programme under manual control. The circuit uses an integrated voltage from the frequency signal to control threshold devices operating triggered switches controlling supply to the lamps, and to actuate a magazine control; a saw tooth signal being used as the basic timing signal in operating the lamps.

REFERENCES:
patent: 3282155 (1966-11-01), Cleary
patent: 3622236 (1971-11-01), Novy
patent: 3841744 (1974-10-01), Rubin
patent: 3844646 (1974-10-01), Oury

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