Reflection-type overhead projector

Details Reflection-type overhead projector Reflection-type overhead projector

1986-12-22

1989-04-25

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353 57, G03B 2106

Patent

active

048242390

ABSTRACT:
A reflection-type overhead projector for projecting large transparencies onto a remote screen. The overhead projector has a base with a Fresnel mirror that serves as a stage on which a transparency to be projected is placed, and a lamp housing for a projection lens with an associated mirror which is supported on a pivotable arm above the base. The lamp housing is formed with an opening for allowing the passage of light to illuminate the transparency on the stage. This opening is fitted with a protective screen for guarding the fingers from the heated illumination lamp.

REFERENCES:
patent: 1444054 (1923-02-01), Benjamin
patent: 1474401 (1923-11-01), Bramley
patent: 3340765 (1967-09-01), Herriott
patent: 3459475 (1969-08-01), Lucas
patent: 4206984 (1980-06-01), Mueller

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