Distortion correction for an overhead projector system

Details Distortion correction for an overhead projector system Distortion correction for an overhead projector system

1983-01-03

1984-03-13

Haroian, Harry N.

Optics: image projectors

Unitary plural refracting surfaces

353DIG3, 353102, 353 70, G03B 2114

Patent

active

044363923

ABSTRACT:
An overhead projector which projects a distortion-free image onto a vertical screen at an oblique angle above the horizontal plane. In a first embodiment of the invention, a projection lens and mirror are displaced from the center of a transparency stage in the direction of projection and a thin, linear, incrementally-grooved prismatic sheet is positioned parallel to the stage and between the stage and a lighting means to redirect light transmitted through the stage and the transparency to the projection lens. In a second embodiment of the invention, the grooved prism is formed as an integral part of the lighting means.

REFERENCES:
patent: 3064523 (1962-11-01), Meltzer
patent: 3511563 (1970-05-01), Erwin
patent: 3637308 (1972-01-01), Van Raalte et al.
patent: 4002408 (1977-01-01), Amma
patent: 4089599 (1978-05-01), Kuboshima
patent: 4118114 (1978-10-01), Anderson et al.
patent: 4204881 (1980-05-01), McGrew

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