Optical projector for transparencies and opaques

Details Optical projector for transparencies and opaques Optical projector for transparencies and opaques

1988-03-21

1990-03-27

Haroian, Harry N.

Optics: image projectors

Epidiascope

353 97, 353119, G03B 2128

Patent

active

049127527

ABSTRACT:
An optical projector having opaque and transparency operating modes employs a pair of illumination paths, conventional overhead-projection optics, common focus elements, and a large-aperture stage. Oversized objects such as large books or magazines are accommodated by a resilient bottom of a light-constraining hood assembly. A light source is oriented in a manner that eliminates optical or physical interferences between the pair of projection modes. The hood assembly provides novel reflectivity for image intensification in the opaque mode and easy access to the stage for either opaque or transparency projection. Most elements associated with either projection mode can be detached in a unit, leaving solely the remaining mode capability.

REFERENCES:
patent: 2596393 (1952-05-01), Fitzgerald
patent: 3340765 (1967-09-01), Herriott
patent: 3512883 (1970-05-01), Noble
patent: 3525566 (1970-08-01), Altman
patent: 3744892 (1973-07-01), Shipsey
patent: 4156561 (1979-05-01), Lucas
patent: 4264168 (1981-08-01), Baliozian

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