Patent
1987-05-12
1989-10-03
Arnold, Bruce Y.
350452, 350132, 350167, G02B 504, G02B 308
Patent
active
048712337
ABSTRACT:
There is disclosed a thin plate optical element of the Fresnel type having refracting and magnifying properties. One face of the thin plate element is formed with a plurality of straight line, parallel and evenly spaced triangular prisms and the opposite face of the element has a plurality of coaxial, arcuate prisms of varied face angles in a progressive order of decreasing face angles extending outwardly from the center of the optical element. The arcuate prisms can be a single, continuous helical prism with a continuously variable and decreasing face angle along its length from the center of the element or, preferably, can be a plurality of concentric circular prisms of incrementally increasing diameter and decreasing face angles. One face of the optical element thus functions as a magnification lens while the other face of the optical element functions to refract the stereoscopic images the necessary degree for fusing of these images into a single three dimensional illusion. The element is used in a stereoscopic viewing system, positioned in front of a display of the stereoscopic images which are viewed through a pair of eyepieces with the necessary optical elements for creating the three dimensional illusion.
REFERENCES:
patent: 1872501 (1932-08-01), Rehlander
patent: 2510344 (1950-06-01), Law
patent: 4274714 (1981-06-01), Okamura
patent: 4588259 (1986-05-01), Sheiman
patent: 4688905 (1987-08-01), Okamura
Xerox Disclosure Journal, "Fresnel Lens Concept for Projecting Slides", Price & Spurles, vol. 4, No. 5, pp. 665-656, Sept./Oct. 1979.
Feigenblatt, "Variable Gain Diffusing Optical Projection Screens", IBM Technical Disclosure Bulletin, vol. 27, No. 5, Oct. 1984, pp. 3031.
Research Disclosure No. 21036, "Optical Device for Collecting Light from a Scanned Line in a Single Point", Oct. 1981, pp. 380.
Arnold Bruce Y.
Callaghan Terry S.
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