System and device for overhead projection

Details System and device for overhead projection System and device for overhead projection

1971-12-10

1977-01-11

Haroian, Harry N.

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

353DIG3, B03B 2100

Patent

active

040024083

ABSTRACT:
In a system of overhead projection there is provided a horizontal stage on which is to be placed an object to be imaged. Means for illuminating the object is mounted below the stage at an angle thereto, while a projection lens system is installed above the stage and parallel thereto, in such a position that the axis of the light from the illumination means passes at an angle through its center. A mirror mounted above the lens system projects the undistorted image of the object onto a vertical screen. In another system of overhead projection based on the same principles, the stage and the projection lens system are inclined relative to the illumination means while themselves kept parallel to each other. The axis of the light from the illumination means in this instance extends vertically upwardly and passes at an angle through the center of the lens system. There are further disclosed herein some overhead projectors constructed in accordance with these systems of the invention.

REFERENCES:
patent: 1199460 (1916-09-01), Featherstone
patent: 1291274 (1919-01-01), Vebelmesser
patent: 1952522 (1934-03-01), Warmisham
patent: 2699704 (1955-01-01), Fitzgerald
patent: 2795996 (1957-06-01), Sauer
patent: 3051041 (1962-08-01), Lehmann et al.
patent: 3212398 (1965-10-01), Miller
patent: 3547530 (1970-12-01), Poole

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