Overhead projector

Details Overhead projector Overhead projector

1988-02-12

1989-07-11

Haroian, Harry N.

Optics: image projectors

Reflector

353 70, 353DIG3, 353101, B03B 2100

Patent

active

048465704

ABSTRACT:
An overhead projector which has a stage for supporting an original thereon comprises an optical system for collecting light to the entrance pupil of a projection lens and a movable mirror for directing light from an illumination light source to an optical system.
The movable mirror is movable with the movement of the projection lens parallel to the plane of the stage for placing an original thereon so that trapezoidal distortion and loss of focus which occur when the projection lens projects an image at an oblique angle are avoided. The position for the collection of the illumination light by the optical system is changed according to the movement of the projection lens, and illumination light is always collected at the position of the entrance pupil of the projection lens.

REFERENCES:
patent: 2564057 (1951-08-01), Fitzgerald
patent: 3081670 (1961-12-01), Weisglass
patent: 3547530 (1970-12-01), Poole
patent: 4002408 (1977-01-01), Amma
patent: 4634246 (1987-01-01), Dreyer, Jr.
patent: 4735500 (1988-04-01), Grunwald

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