Slide presence shutter lock

Details Slide presence shutter lock Slide presence shutter lock

1978-11-20

1980-04-29

Shepperd, John W.

Optics: image projectors

Shutter

G03B 2300

Patent

active

042003687

ABSTRACT:
A slide projector located within a rear-screen projector housing has a slide tray and slide positioning mechanism, which includes a shutter and slide clamp control portion, in cooperative relation with a gravity feed slide tray which is removably mounted on the rear-screen projector housing. Incorporated within the projector is a slide gate and a shutter for blocking the optical path during changing of the slide. Also included therein is a means for detecting the presence, or absence, of a slide which retains the shutter in the blocking position when a slide is absent from the slide gate.

REFERENCES:
patent: 3138062 (1964-06-01), Maiershofer
patent: 3334544 (1967-08-01), Zillmer
patent: 3411845 (1968-11-01), Pester et al.
patent: 3876298 (1976-04-01), Hickey

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