Optics: image projectors – Selective projection on distant or cabinet screen
Patent
1976-01-09
1977-06-21
Haroian, Harry N.
Optics: image projectors
Selective projection on distant or cabinet screen
353 78, 353101, G03B 2128, G03B 2130
Patent
active
040308219
ABSTRACT:
Disclosed is a slide projection apparatus convertible for projection of an image either onto a remote surface or onto a screen built into the housing of the apparatus. A door, for selectively blocking the projection path, is coupled with a projection lens supported on a carrier. The lens is alternatively positionable along a substantially horizontal axis for straight ahead external projection and is positionable substantially perpendicular to that axis for internal projection onto the built-in screen. During external projection, the lens is focusable. Upon return to internal projection condition, the lens is automatically focused for the built-in screen. The projection apparatus includes a device to cause the light source to be energized at a high brightness level for external projection and to be automatically changed to a lower brightness level for internal projection.
REFERENCES:
patent: 2391879 (1946-01-01), Chambers
patent: 3159841 (1964-12-01), Castedello et al.
patent: 3885868 (1975-05-01), Hadzimihalis
patent: 3904286 (1975-09-01), Omi et al.
Bell & Howell Company
Haroian Harry N.
Peele, Jr. John E.
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