1984-12-21
1989-05-30
Corbin, John K.
350144, G02B 106, G02B 2722
Patent
active
048345121
ABSTRACT:
A three-dimensional display is disclosed which uses a variable focal length lens through which two-dimensional images of an object are viewed. In one embodiment, a sequence of different images representative of cross sections of the object along its depth dimension are presented by a two-dimensional display apparatus such as a high resolution CRT. The viewer sees these two-dimensional images of the object through the variable focal length lens. The focal length of the lens is changed in synchronization with the two-dimensional images such that each cross section image is seen at a different focal length, thus resulting in a three-dimensional image of the object. The rate of change of the two-dimensional images and the focal length of the lens is higher than the retention rate of the eye of the viewer, thus the images presented appear to fuse into a coherent three-dimensional image. Also disclosed is a fluid-filled lens having an optically transparent elastic membrane for one optical surface which changes the lens focal length by changing membrane curvature in response to fluid pressure changes. A controller is used to control the sequence of two-dimensional images presented and the fluid pressure of the lens. The controller may also size particular two-dimensional images of the object to produce a proper perspective in the three-dimensional image.
REFERENCES:
patent: 2836101 (1958-05-01), DeSwart
patent: 3161718 (1964-12-01), DeLuca
patent: 3305294 (1967-02-01), Alvarez
patent: 3493290 (1970-02-01), Traub
patent: 3632184 (1972-01-01), King
patent: 4130832 (1978-12-01), Sher
Genisco Computers Corp. brochure, dated 1981, "SpaceGraph--the Ture 3D Display System . . . ".
Electronics, Jul. 28, 1981, "Terminal Puts Three-Dimensional Graphics on Solid Ground", H. S. Stover, Genisco Computers Corporation.
Corbin John K.
Hughes Aircraft Company
Karambelas A. W.
Runk Thomas A.
Sugarman Scott J.
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