Overhead projector

Details Overhead projector Overhead projector

1988-02-12

1989-09-05

Haroian, Harry N.

Optics: image projectors

Lens support

Lens position adjustable

353 98, 353DIG6, G03B 21301

Patent

active

048632635

ABSTRACT:
A overhead projector including a projection lens and a deflection mirror for directing the light projected from the lens toward a screen, both the lens and the mirror being individually pivotally movable about horizontal axes parallel to each other and to the original support surface of a stage. The lens is pivotally movable in accordance with variations in the angle of inclination of the mirror and is also pivotally movable with the focusing operation of the lens by an interlocking mechanism. The lens is brought to a proper pivotally moved position by the mechanism according to the angle of elevation and to the focusing operation to project images free of trapezoidal distortion and less of focus.

REFERENCES:
patent: 3081670 (1963-03-01), Weisglass
patent: 4634246 (1987-01-01), Dreyer
patent: 4735500 (1988-04-01), Grunwald

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