Dukane Corporation

Charles B Jewison

Brian E Buck

Foldable portable overhead projector

A portable foldable overhead projector includes a housing having a front opening communicating with an interior cavity, and a bottom aperture communicating with the cavity and closable by a pair of pivoting doors which, when open, support the housing on support legs and accommodate movement of a mirror inside the housing between stowed and use positions. In the use position the mirror reflects light from a source through a transmitting stage in the top wall of the housing which forms a pivoting door to provide further access to the cavity. A mast pivots along the outside of the housing and carries a foldable projection head assembly on a rack and pinion mechanism. When the mast is lowered the rack and pinion can be operated to move the folded projection head assembly through the front opening into the cavity for storage.

A filmstrip viewer/projector unit includes two separate projection lenses, one for front projection on a remote screen and the other for rear projection on a small local viewing screen built into the unit. A film carrier has two separate apertures therein respectively disposed in optical alignment with the two projection lenses for cooperation therewith to define first and second optical axes. A lamp directs a beam of light to a plane mirror disposed between the lamp and the film carrier and movable between two positions for respectively reflecting the beam of light along the first and second optical axes, respectively for projecting the film image onto the associated remote and local screens. First and second condenser lenses are respectively disposed along the optical paths between the reflector and the film carrier. The projection lenses share a common focusing mechanism.

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Batavia, IL, United States of America

Charles B Jewison