Recording medium detecting system

Details Recording medium detecting system Recording medium detecting system

2007-11-27

2007-11-27

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

C324S071100, C324S228000, C324S232000, C324S607000

Reexamination Certificate

active

11477566

ABSTRACT:
A recording medium detecting system includes a magnetic field-generating unit that generates an alternating magnetic field in a predetermined particular region, a detecting unit provided close to the particular region, that detects a change in magnetic flux density not smaller than a predetermined magnetic-flux-density difference B2, and a recording medium, containing multiple magnetic wires made of a magnetic material and formed in a wire shape having a predetermined length, that causes a large Barkhausen effect when the alternating magnetic field is applied. A magnetic-flux-density difference B1detected by the detecting unit at an installation position thereof when the recording medium is placed in the particular region is not smaller than the magnetic-flux-density difference B2.

REFERENCES:
patent: 4734644 (1988-03-01), Imakoshi et al.
patent: 5331278 (1994-07-01), Evanson et al.
patent: A-2004-285524 (2004-10-01), None

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