Optics: image projectors – Selective projection on distant or cabinet screen
Patent
1980-09-11
1982-05-25
Haroian, Harry N.
Optics: image projectors
Selective projection on distant or cabinet screen
353 82, 353 87, 353101, G03B 2122
Patent
active
043313973
ABSTRACT:
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.
REFERENCES:
patent: 1176485 (1916-03-01), Ott
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patent: 3582195 (1971-06-01), Pignone
patent: 3885868 (1975-05-01), Hadzimihalis
patent: 3899246 (1975-08-01), Edestein
patent: 4092063 (1978-05-01), Koester
patent: 4111537 (1978-09-01), Wells et al.
patent: 4139283 (1979-02-01), Cook
patent: 4156561 (1979-05-01), Lucas
patent: 4163610 (1979-08-01), Sanderson
Buck Brian E.
Jewison Charles B.
Dukane Corporation
Haroian Harry N.
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