High resolution halftone microimages and method therefor

Details High resolution halftone microimages and method therefor High resolution halftone microimages and method therefor

G - Physics

02

B

88/0.1

G02B 27/44 (2006.01) G03C 5/02 (2006.01) G03C 7/00 (2006.01) G03F 5/00 (2006.01) G03F 7/00 (2006.01)

Patent

CA 1116897

ABSTRACT High resolution microimages of continuous tone photographs must be prepared in halftone form to enable inexpensive duplication of the microimages by conven- tional graphic arts processes. The halftone pattern in such microimages must have a spatial frequency of not less than about 40 line pairs per millimeter in order to enable the projection of an acceptably detailed enlarged image. In the present invention, such halftone micro- images are prepared using an ultra-high resolution gradiers density screen having therein an image of an interference fringe field resulting from an exposure of a perform of the screen to two interfering mutually coherent beams of radiation.

318996

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