Access card

Details Access card Access card

1985-07-05

1987-09-15

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235487, 235488, G06K 710

Patent

active

046941487

ABSTRACT:
In an access card having coded material which comprises a plurality of markings which under infrared radiation appear on an infrared receiver, it is provided in accordance with the invention in order to prevent counterfeiting that a continuous and transparent plastic foil or film blank (4), at least on a portion of its surface, has a layer (4a) that is not transparent to visible light and is transparent to infrared light; together with a substrate (5), the blank embodies a laminate which on its inside carries a photosensitive layer (7) covered by a layer that is transparent to infrared light. The markings (21-23) appear as a negative or positive on the photosensitive layer (7) as the result of exposure of the plastic foil or film blank (4) to light.

REFERENCES:
patent: 3763356 (1973-10-01), Berler
patent: 3786237 (1974-01-01), Postal
patent: 3802101 (1974-04-01), Scanflin
patent: 3873813 (1975-03-01), Lahr
patent: 4605846 (1986-08-01), Duret

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