G - Physics – 03 – B
Patent
G - Physics
03
B
88/46
G03B 21/00 (2006.01) G03B 27/18 (2006.01)
Patent
CA 1142376
ABSTRACT OF THE DISCLOSURE Photography, particularly rear view projections systems. The present method is directed towards correction of non- uniform illumination in oblique projection onto rear view screens. Traditionally, the oblique angle projection results in distortion known as the "Keystone effect" and in non- uniform illumination, namely that portion of the viewing screen nearest the lens receiving a greater portion of the light and that portion of the screen farthest from the lens receiving lesser light. The present method includes selective illumination of the slide transparency so as to direct more light through that portion of the image which is to be displayed farthest from the lens and less light upon that portion of the image which is to be displayed nearest the lens. As a result, there is achieved substantially uniform illumination of the obliquely projected image.
369698
Hoppmann Kurt H.
Hoppmann Peter G.
Lin James S.
Hoppmann Corporation
Meredith & Finlayson
LandOfFree
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