Optics: image projectors – Distortion compensation – For projection axis inclined to screen
Patent
1974-04-22
1976-01-06
Aegerter, Richard E.
Optics: image projectors
Distortion compensation
For projection axis inclined to screen
350123, 353 75, 353 97, G03B 2100, G03B 2156
Patent
active
039307239
ABSTRACT:
A concave mirror is positioned at an angle to a flat surface containing a picture so that a viewer can view the picture as reflected to his eye by the concave mirror. Masking is provided about the marginal edges of the concave mirror to define within the masking a reflecting area less than the total area of the picture. As a result, the degree of visibility of the top, bottom, and side portions of the picture can be changed by the viewer shifting his line of sight, the masking means defining a window which appears closer than the viewed picture so that a three-dimensional effect results. Perspective and keystone effects resulting from the angular relationships are compensated for by varying the width dimensions of the masking and the manner in which the picture is formed on the flat surface.
REFERENCES:
patent: 1419901 (1922-06-01), Wyld
patent: 2045120 (1936-06-01), Carpenter
patent: 2174778 (1939-10-01), Croft
patent: 2320760 (1943-06-01), Surre
patent: 2482031 (1949-09-01), Rose
patent: 3246943 (1966-04-01), Holt
Aegerter Richard E.
Creative Optics, Inc.
Pastoriza Ralph B.
Stephan Steven L.
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