Multilayer data carrier and methods for writing on a multilayer

Details Multilayer data carrier and methods for writing on a multilayer Multilayer data carrier and methods for writing on a multilayer

1989-12-04

1994-03-29

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

283 85, 346 76L, 3461351, 41J 2435, B41J 2435

Patent

active

052989224

ABSTRACT:
A multilayer identity card exhibits an outer color layer of a first color and an inner color layer of a second color to allow for identity cards and the like to be written on in several colors. While the outer color layer absorbs virtually no laser beam light used for writing, the second, inner color layers absorbs the laser light. This causes the material of the second color layer to be thermally broken down during the writing operation, i.e. vaporized, sublimated, exposed to a chemical or physical reaction, so that the formation of pressure and resulting eruption blasts the first layer into particles. This makes the second color layer visible. Instead of the second color layer one can also provide a transparent layer of varnish having suitable properties in order to expose a multicolor security print, for example, below this transparent layer of varnish.

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