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Sensor for detecting location of metal body

  • US 5,390,109 A
  • Filed: 07/21/1992
  • Issued: 02/14/1995
  • Est. Priority Date: 11/24/1990
  • Status: Expired due to Fees
First Claim
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1. A sensor for detecting location of a metal body object characterized by comprising:

  • a magnetic sensing matrix comprised of matrix-arranged sensing units for sensing an object;

    a driving means which drives the sensing matrix and receives a signal indicative of the state of each sensing unit; and

    a detecting means which detects location of the object on the sensing matrix on the basis of the signal received by said driving means; and

    said detecting means including an offset means which sequentially updates and memorizes a value of said received signal as an offset value at every sensing unit, an operation means which operates a change in values between a value of a newly received signal and the offset value before updating, and a comparing means for comparing the change in values between the two with a preset value to detect the presence of the object.

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