Overhead projector

Details Overhead projector Overhead projector

1986-03-28

1988-04-05

Haroian, Harry N.

Optics: image projectors

Temperature control

Blower

353119, 353DIG4, G03B 2116

Patent

active

047355000

ABSTRACT:
An overhead projector comprises a flat base accommodating a reflective Fresnel lens below a writing surface. A hollow arm projecting up from one side of the base supports a projection head comprising a light source, an objective lens assembly spaced horizontally from the light source, a first deflection mirror for directing rays from the light source down onto the writing surface and reflective Fresnel lens and a second deflective lens for directing rays from the writing surface and reflective Fresnel lens out through the objective lens assembly. The objective lens assembly is tiltable to direct light rays on an upwardly inclined path and the second deflection mirror is also tiltable and is coupled with the objective lens assembly so as to be tilted half as much as the objective lens assembly.

REFERENCES:
patent: 3081670 (1963-03-01), Weisglass
patent: 3459475 (1969-08-01), Lucas
patent: 3472589 (1969-10-01), Field
patent: 3486817 (1969-12-01), Hubner
patent: 4206984 (1980-06-01), Mueller
patent: 4565430 (1986-01-01), Grunwald

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