Retrofocus lens for overhead projector

Details Retrofocus lens for overhead projector Retrofocus lens for overhead projector

1987-12-26

1989-09-19

Haroian, Harry N.

Optics: image projectors

Reflector

353100, 353DIG6, G02B 964

Patent

active

048675555

ABSTRACT:
A four-element inverted telephoto projection lens assembly for use in conventional overhead projectors is disclosed. The lens assembly features a reduced projection distance from the lens assembly to the projection screen while retaining the same back focus as conventional two-element projection lenses for overhead projectors.

REFERENCES:
patent: 3126786 (1964-03-01), Appledorn
patent: 3334957 (1967-08-01), Field
patent: 4145117 (1979-03-01), Ikeda
patent: 4182549 (1980-01-01), Kreitzer
patent: 4203653 (1980-05-01), Mori
patent: 4304466 (1981-12-01), Betensky
"L.C. Light Valve Projector for Shipboard Use" Ronald S. Gold, SPIE vol. 250, 1980.

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