Overhead projector

Details Overhead projector Overhead projector

1987-06-04

1991-05-21

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG4, 353 57, G03B 21132, G03B 2116

Patent

active

050170023

ABSTRACT:
An overhead projector comprises a hollow base comprising a writing plate and a reflective Fresnel lens below the writing plate and an air space below the Fresnel lens. A hollow support arm projecting up from one side of the base carries a projection head having an objective lens and deflection mirror. A lamp mounted in the transition between the support arm and the projection head directs light on the writing plate. The hollow support arm is in communication with the interior of the base to provide a cooling air flow path between openings in the base at the side opposite the support arm and openings in the support arm adjacent the projection head, behind which latter openings a blower is mounted. Ribs in the hollow base define air flow distributors for effectively cooling the Fresnel lens and electronic circuit components mounted in the hollow base.

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