Multiple optics slide projector

Details Multiple optics slide projector Multiple optics slide projector

1978-04-24

1979-08-21

Stephan, Steven L.

Optics: image projectors

Lamp control

Dissolve type

353 94, 353 95, 353111, G03B 2120, G03B 2126, G03B 148

Patent

active

041651618

ABSTRACT:
The projector includes two projection optics systems and two slide gates which move slides acquired from a slide receptacle into and out of a viewing position in all of the projection optics systems. The slide gates are movable between a first position, which is common to both slide gates and in which slides are moved between the slide receptacle and the side gate means, and the second position in one of the projection optics systems. The slides move by gravity from the slide receptacle into the slide gates and by means of a slide lifter from the slide gates back into the slide receptacle. A combination of a scalloped gear matching the depending lugs on the slide receptacle and a stepping motor to control the movement of the gear provides efficient and economical control over the movement of the slide receptacle. The slide gates, the slide lifter, and the slide receptacle gearing are independent of each other in operation, so that they may be activated in any sequence.

REFERENCES:
patent: 3161109 (1964-12-01), Carrillo
patent: 3174395 (1965-03-01), Krull
patent: 3296727 (1967-01-01), Liguori
patent: 3369452 (1968-02-01), Grenier
patent: 3468603 (1969-09-01), Kovarik et al.
patent: 3501231 (1970-03-01), Fisher
patent: 3501232 (1970-03-01), Jackson
patent: 3813797 (1974-06-01), Masters et al.
patent: 3884569 (1975-05-01), Hickey
patent: 4094599 (1978-06-01), Frey

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