Low-glare overhead projector

Details Low-glare overhead projector Low-glare overhead projector

1976-06-21

1978-10-03

Haroian, Harry N.

Optics: image projectors

Unitary plural refracting surfaces

353DIG3, 353102, G03B 2114

Patent

active

041181140

ABSTRACT:
An overhead projector that uses as a condensing lens a linear echelon lens structure comprising a combination of linear echelon lens elements between the light source and stage of the projector to minimize glare emanating from the condensing lens.

REFERENCES:
patent: 2115178 (1938-04-01), Rolph
patent: 2543561 (1951-02-01), Tracy
patent: 2726573 (1955-12-01), Maloff
patent: 3209646 (1965-10-01), Appledorn
patent: 3366005 (1968-01-01), Benedict
patent: 3479117 (1969-11-01), Tronnier et al.
patent: 3511563 (1970-05-01), Erwin
patent: 3580661 (1971-05-01), Cooper
patent: 3712713 (1973-01-01), Appledorn
patent: 3747488 (1973-07-01), Bennett
patent: 3830556 (1974-08-01), Bratkowski

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