Device for ascertaining the authenticity of an article and image

Details Device for ascertaining the authenticity of an article and image Device for ascertaining the authenticity of an article and image

1995-12-06

1998-10-20

Chang, Jon

Image analysis

Applications

Reading paper currency

356 71, 283 85, G06K 900

Patent

active

058259112

ABSTRACT:
An article 1 to be prevented from forgery previously contains an optical semiconductor, the mixing ratio of which is predetermined. Under the condition that a light source 6 is turned off, microwaves are emitted to the article 1 to be prevented from forgery through a feed phone 5. These microwaves are reflected on the article 1 to be prevented from forgery and supplied to a receiving section 8 through a feed phone 7, so that the receiving level of the microwaves can be measured. Next, the light source 6 is turned on, and the receiving level of the microwaves is measured in the same manner. When an optical semiconductor is irradiated with rays of light, it is excited, so that the microwave reflection factor is enhanced. Accordingly, the receiving level in the case where the light source 6 is turned on is higher than the receiving level in the case where the light source 6 is turned off.

REFERENCES:
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patent: 4609207 (1986-09-01), Muck et al.
patent: 4820912 (1989-04-01), Samyn
patent: 5196786 (1993-03-01), Usami et al.
patent: 5279403 (1994-01-01), Harbaugh et al.
patent: 5475468 (1995-12-01), Natsudaira
Hecht. Optics. 2.sub.nd Edition. Addison-Wesley Publishing Co. pp. 37-43, 1987.

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