Method for reading of invisible marking

Details Method for reading of invisible marking Method for reading of invisible marking

1995-06-06

1997-11-11

Hannaher, Constantine

Radiant energy

Coded record and readers; invisible radiant energy type

2503418, G06K 710

Patent

active

056867255

ABSTRACT:
A method for reading of information, which comprises printing information on a metal substrate or a substrate capable of transmitting infrared rays of 2-10 .mu.m wavelength, with a marking ink containing tin oxide, indium-tin mixed oxide or a mixture of tin oxide or indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, as necessary coating a clear coating or a coloring ink on at least the information-printed area of the substrate, and identifying the information by the use of a CCD camera sensitive to infrared rays of 2-10 .mu.m wavelength or an infrared detector. No noise is generated even when the reflectance of a light from the substrate surface is large, and the information can be identified (read) easily.

REFERENCES:
patent: 3566120 (1971-02-01), Lane, Jr.
patent: 5350448 (1994-09-01), Dietz et al.

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