Distortion correction for an overhead projector system

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

G - Physics

03

B

88/46.5

G03B 21/132 (2006.01)

Patent

CA 1240862

-1- Distortion Correction for an Overhead Projector System Abstract An overhead projector (27) which projects a distortion-free image onto a vertical screen (32) at an oblique angle above the horizontal plane. In a first embodiment of the invention, a projection lens (28) and mirror (33) are displaced from the center of a transparency stage (30) in the direction of projection and a thin, linear, incrementally-grooved prismatic sheet is positioned parallel to the stage (30) and between the stage (30) and a lighting means (40) to redirect light transmitted through the stage (30) and the transparency to the projection lens (28). In a second embodiment of the invention, the grooved prism (38) is formed as an integral part of the lighting means (40).

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