Reflection type overhead projector

Details Reflection type overhead projector Reflection type overhead projector

1984-12-20

1987-01-13

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353101, 353 38, G03B 2106

Patent

active

046360506

ABSTRACT:
A reflection type overhead projector employs a Fresnel concave mirror adapted for allowing a transparency to be put on the mirror surface thereof. The beam of light emitted from a light source lamp is reflected by the Fresnel concave mirror, enters a projecting lens and then is projected on a screen. A reflecting mirror is interposed in an optical path between the Fresnel concave mirror and the projecting lens to thereby bend the optical path. The Fresnel concave mirror, the light source lamp and the projecting lens are all mounted to a single case.

REFERENCES:
patent: 3340765 (1967-09-01), Herriott
patent: 3459475 (1969-08-01), Lucas
patent: 3619048 (1971-11-01), Engert
patent: 3947103 (1976-03-01), Altman
patent: 3951535 (1976-04-01), Altman
patent: 4111537 (1978-09-01), Wells et al.
patent: 4386833 (1983-06-01), Hirose
Technische Optik, G. Schroder, 1974--excerpts.

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