The Singer Company

Telex Communications, Inc.

William R Sanderson

Boris Gelman

William T Daly

An automatic focusing system for a slide projector which utilizes a pair of photocells is provided with a non-linear response characteristic to introduce a change in the sensor balance point when a glass covered film slide is projected as opposed to when an open film slide is projected. Accordingly, glass covered film slides and open film slides can be randomly intermixed without changing the projector focus.

Automatic focusing system

A rear/remote-screen projector includes means for alternatively projecting slide images on a remote screen or on a rear screen mounted on the projection housing. The opening of a door in the housing laterally shifts one of the mirrors in the housing without changing the angular orientation thereof thereby allowing the projected image, previously reflected by this mirror to other mirrors and eventually to the integral rear-screen, to pass through the door opening and to a remote screen.

Growing community of inventors

Rochester, NY, United States of America

William R Sanderson