Forgery-preventing document reading device based on microwave re

Details Forgery-preventing document reading device based on microwave re Forgery-preventing document reading device based on microwave re

1995-10-17

1997-08-26

Rosenberger, Richard A.

Optics: measuring and testing

Document pattern analysis or verification

250556, 324637, G06K 962

Patent

active

056615523

ABSTRACT:
Metal fibers are mixed, at a predetermined mixing ratio, into a document for which forgery should be prevented. In reading a document, microwaves are applied to the document via a transmission antenna and reflected microwaves are received via a reception antenna. The document includes a portion in which the microwave reception level falls within a predetermined range and which portion is longer than a predetermined length, the document is regarded as a forgery preventive document and the copying operation is stopped. Further, a registration guide is so formed as to reflect microwaves at a certain reflectance. Influences of variations due to a temperature change and aging are compensated by measuring a reception level corresponding to the registration guide.

REFERENCES:
patent: 4586811 (1986-05-01), Kubo et al.
patent: 4681455 (1987-07-01), Jeschke et al.
patent: 4723149 (1988-02-01), Harada
patent: 5279403 (1994-01-01), Harbaugh et al.
patent: 5481334 (1996-01-01), Arimoto et al.
patent: 5495329 (1996-02-01), Anderson et al.

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