Overhead projector with small and large stage surfaces

Details Overhead projector with small and large stage surfaces Overhead projector with small and large stage surfaces

1991-03-22

1992-06-09

Cuchlinski, Jr., William A.

Optics: image projectors

Particular condenser

353122, 353 38, 353DIG3, G03B 2106

Patent

active

051201259

ABSTRACT:
This invention is for an overhead projector to be used with at least one large stage aperture and a small stage aperture above a Fresnel lens, comprising a light source mounted below the plane of the stage, characterized by a single or multi-element condenser which can be positioned between the lamp housing and Fresnel lens. In the case of a small stage aperture, the condenser focuses the light flux designed for the large stage aperture onto the small stage aperture.

REFERENCES:
patent: 4080052 (1978-03-01), Levin et al.
patent: 4089599 (1978-05-01), Kuboshima
patent: 4338006 (1982-07-01), Ozeki

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