Slide projector having two image-projection systems which operat

Optics: image projectors – Lens support – Lens position adjustable

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Details

353 89, 353 94, G03B 2120, G03B 2126

Patent

active

044165200

ABSTRACT:
The slide projector includes side-by-side image-projection systems and a circular slide tray, with slides passing in operation directly between the slide tray and either of two slide gates, the slide gates moving between a first position in which slides are acquired and released, and a second position in which slides are projected onto a screen. A slide lifter, a slide tray lock, slide clamps on each slide gate, and the slide gates are operated in a particular sequence relative to the movement of the slide tray to insure proper handling of the slides in the projector. The slide tray fits on a central hub which in turn is independently driven. Sensors are provided to continuously detect the position of the lifter, the slide gates, and the slide tray. A front end assembly which incorporates lenses which move laterally and vertically, with the longitudinal axes of the lenses remaining parallel at all times, provides precise image alignment, including image overlap and separation.

REFERENCES:
patent: 1766102 (1930-06-01), Brenkert et al.
patent: 2598573 (1952-05-01), Lutes
patent: 4165161 (1979-08-01), Kramer

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