Illumination system for overhead projector

Details Illumination system for overhead projector Illumination system for overhead projector

1986-09-19

1988-01-12

Husar, Stephen F.

Illumination

Light source and modifier

Including reflector

353 64, 362328, F21V 700

Patent

active

047195479

ABSTRACT:
An illumination system for use in an overhead projector which includes a tungsten filament light source, a back concave reflector, and a plano-convex glass condenser. The position of the light source relative to the concave reflector is controlled to give a specific longitudinal separation of the light source filament and its magnified image which results in a radiation parallax which produces improved efficiency, illumination and light uniformity at the projected image of the overhead projector.

REFERENCES:
patent: 3486817 (1969-12-01), Hubner

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