Specific document determining apparatus, image reading apparatus

Details Specific document determining apparatus, image reading apparatus Specific document determining apparatus, image reading apparatus

1997-10-24

2000-02-15

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

060256036

ABSTRACT:
The present specific document determining apparatus according to the present invention comprises a microwave sensor for irradiating a microwave to and scanning a document, detecting a reflected portion of the irradiated microwave, outputting a first detection signal, again irradiating a microwave and scanning the document after the document is placed on a contact glass, detecting a reflected portion of the irradiated microwave, and outputting a second detection signal; a signal processing section for using the first detection signal as a reference signal and comparing a level of the reference signal to a level of the second detection signal to make determination as to whether metallic fiber is included in the document or not, and a controller for making determination as to whether the document is a specific one or not according to a result of determination by the signal processing section.

REFERENCES:
patent: 4524276 (1985-06-01), Ohtombe
patent: 5260582 (1993-11-01), Danek et al.
patent: 5682103 (1997-10-01), Burrell

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