Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-06-21
2005-06-21
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S552000, C324S244000, C324S247000, C324S249000, C324S253000, C324S255000, C324S260000
Reexamination Certificate
active
06909368
ABSTRACT:
The present invention is a magnetic field detection device that makes use of a frequency characteristic affording circuit in order to selectively detect magnetic signals from a frequency domain accurately at a high level of sensitivity. The present invention has a magneto-impedance element, a detector coil and a negative feedback coil which is wound around the magneto-impedance element, and a frequency characteristic affording circuit which affords a frequency characteristics on the negative feedback signal of a negative feedback connecting an output terminal thereof with the negative feedback coil. Using filters as the frequency characteristic affording circuit, the following are possible uses of this magnetic field detection device: a geomagnet detection device for earthquake prediction (using a high-pass filter), a bill validation apparatus for vending machines, etc. (using a low-pass filter), and a magnetic oscillation detection device for a magnetic gate system (using a band-reject filter).
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Publication: US 2001/0030537 A1; Honkura et al.; Magnetic Field Detection Device.
Honkura Yoshinobu
Mori Masaki
Nagao Tomohiko
Sumi Kazumasa
Aichi Micro Intelligent Corporation
Hofsass Jeffery
Pham Lam
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