Identification card with a visible authenticity feature

Details Identification card with a visible authenticity feature Identification card with a visible authenticity feature

1988-06-29

1990-01-16

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156277, 156299, 283 94, 428916, 430 10, 430 13, 430 14, 430 18, B29C 7104, B29D 900

Patent

active

048941107

ABSTRACT:
Information is provided in a multilayer identification card by means of a laser beam. This information is recorded by irreversibly changing (blackening) transparent synthetic material. Synthetic materials which blacked at different intensity values are used for the individual card layers. By controlling the laser beam intensity, information can thus be recorded only in one layer or else simultaneously in several layers. If the layer arrangement, layer materials and recording parameters (intensity, writing width, etc.) are selected appropriately, images can be produced which change their appearance when the viewing angle is changed. The various visual effects which can thereby be obtained serve to distinguish the authenticity of the identification card.

REFERENCES:
patent: 4544181 (1985-10-01), Maurer et al.
patent: 4579754 (1986-04-01), Maurer et al.
patent: 4596409 (1986-06-01), Holbein et al.
patent: 4597592 (1986-07-01), Maurer et al.
patent: 4602263 (1986-07-01), Borror
patent: 4735670 (1988-04-01), Maurer

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