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Method for detecting the magnetic field of a tire

  • US 6,404,182 B1
  • Filed: 06/22/2000
  • Issued: 06/11/2002
  • Est. Priority Date: 09/27/1996
  • Status: Expired due to Term
First Claim
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1. A method for detecting magnetic fields produced by residual magnetization on a steel belt embedded in an outer circumferential portion of a tire, the method comprising:

  • magnetizing a first portion of said steel belt over a first predetermined angle extending less than 360°

    along a first circumferential direction of the tire so that a first magnetic field having a first polarity extends in said first circumferential direction of the tire;

    magnetizing a second portion of said steel belt over a second predetermined angle in a second circumferential direction of the tire opposite to said first circumferential direction so that a second magnetic field having a second polarity and opposite to said first polarity extends in said second circumferential direction of the tire;

    positioning a first magnetic detection element so that a magnetic field detection direction of said first magnetic detection element is parallel to a side surface of the tire;

    positioning a second magnetic detection element so that a magnetic field detection direction of the second magnetic detection element is parallel to the side surface of the tire, wherein said first magnetic detection element and said second magnetic detection element are juxtaposed in a direction perpendicular to the side surface of the tire during detection.

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