Forgery proof optoelectric code card reader

Details Forgery proof optoelectric code card reader Forgery proof optoelectric code card reader

1987-10-28

1989-08-01

Pellinen, A. D.

Registers

Coded record sensors

Particular sensor structure

235454, 235488, 250569, G06K 712

Patent

active

048535257

ABSTRACT:
A forgery-proof optoelectric card system is disclosed which includes a reader and code card comprising invisible light and dark codings forming at least one reading track. At least one reading head is provided which may comprise a photodiode as a ligh source and a phototransistor as a light receiver. The light codings having a first pass band to infrared light. Superimposed over selected ones of said light codings are filters having an attenuation band that is narrower than and lies within the pass band of the light codings. Additionally, a secondary light receiver responsive only to light lying within the attenuation band of the filter is provided.

REFERENCES:
patent: 3836754 (1974-09-01), Toye et al.
patent: 4298792 (1981-11-01), Granholm et al.
patent: 4436991 (1984-03-01), Albert et al.
patent: 4544836 (1985-10-01), Galvin et al.
patent: 4605846 (1986-08-01), Duret et al.

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