Adaptor for overhead projector

Details Adaptor for overhead projector Adaptor for overhead projector

1993-03-22

1994-07-19

Cuchlinski, Jr., William A.

Optics: image projectors

Film gate

And lens support

353DIG5, 353122, G03B 2154

Patent

active

053313607

ABSTRACT:
Apparatus for converting an overhead projector to use photographic slides includes a fresnel disk that shortens the illumination convergence point to match the focal length of a typical slide projector. The apparatus includes a base that covers the platen of the overhead projector to prevent illumination spillover, and supports projection optics over an aperture that admits illumination for projecting magnified images of slides onto a vertical viewing surface.

REFERENCES:
patent: 3675998 (1972-07-01), Wilton
patent: 4063810 (1977-12-01), Mailloux
patent: 4120580 (1978-10-01), Mailloux et al.
patent: 4188101 (1980-02-01), Masuda
patent: 4353627 (1982-10-01), Maemori
patent: 4989330 (1991-02-01), Ozeki
patent: 5013148 (1991-05-01), Ozeki
patent: 5092672 (1992-03-01), Vanderwerf
patent: 5121984 (1992-06-01), Jones et al.
patent: 5168294 (1992-12-01), Davis et al.
patent: 5223870 (1993-06-01), Ozeki

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