Variable color print

Details Variable color print Variable color print

1990-03-14

1990-11-06

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 74, 356 71, B42D 1500

Patent

active

049680641

ABSTRACT:
A variable color print of an image including an image medium having a plurality of differently oriented local image regions. Each region includes a number of periodic variations in an optical characteristic of the medium which extend substantially in a first direction within that region and are generally parallel to each other in a second direction transverse to the first direction. Each region further includes a number of periodic variations in color which extend in the first direction and are generally parallel to each other in the second direction and are generally aligned with the periodic optical variations in that region. The periodic optical variations selectively prevent viewing of one or more of the color variations at different viewing angles to generate changes in color of the viewed image as the viewing angle changes. A method of forming such a variable color print is also disclosed.

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patent: 4417784 (1983-11-01), Knop et al.
patent: 4484797 (1984-11-01), Knop et al.
patent: 4568141 (1986-02-01), Antes
patent: 4576439 (1986-03-01), Gale et al.
patent: 4588212 (1986-05-01), Castagnoli

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