Overhead projector

Details Overhead projector Overhead projector

1988-09-14

1990-05-01

Cuchlinski, Jr., William A.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG3, 353 98, 353119, 353101, G03B 21132

Patent

active

049213431

ABSTRACT:
A variable power reflectory type overhead projector for forming a projected luminous beam by lighting a reflecting mirror from the projecting lens side. A transparent film-to-be-projected support is provided between a regular position of the film to be projected and the projecting lens, and an auxiliary lens is included for focusing the projecting lens on the support.

REFERENCES:
patent: 2564057 (1951-08-01), Fitzgerald
patent: 2669156 (1954-02-01), Fitzgerald
patent: 3482911 (1969-12-01), Noble
patent: 3486817 (1969-12-01), Hubner
patent: 3512883 (1970-05-01), Noble
patent: 3711194 (1973-01-01), Wilson
patent: 3762809 (1973-10-01), Kato et al.
patent: 4002408 (1977-01-01), Amma
patent: 4353627 (1982-10-01), Maemori
patent: 4449800 (1984-05-01), De Longis et al.
patent: 4728184 (1988-03-01), Kyhl

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