Condenser lens system for overhead projector

Details Condenser lens system for overhead projector Condenser lens system for overhead projector

1991-06-07

1992-03-03

Cuchlinski, Jr., William A.

Optics: image projectors

Particular condenser

353 38, 353DIG3, G02B 2718, G03B 21132

Patent

active

050926721

ABSTRACT:
This invention consists of a wide-angle, multi-element condenser system for an overhead projector that provides uniform illumination at the plane of the projection transparency, and a well-formed lamp image at the entrance pupil of the projection lens. This is accomplished by using a combination of a glass spherical meniscus lens, a glass plano-convex spherical lens and a plastic aspheric Fresnel lens system.

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Wallin, W., "Design of Special Projector Illumination Systems," Journal of the SMPTE, Oct. 1962, pp. 769-771.
Weiss, H., "Wide-Angle Slide Projection," Information Display, Sep./Oct. 1964, pp. 8-15.

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