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Portable precision electronic caliper

  • US 6,332,278 B1
  • Filed: 11/08/1999
  • Issued: 12/25/2001
  • Est. Priority Date: 05/09/1997
  • Status: Expired due to Term
First Claim
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1. A portable electronic precision caliper comprising:

  • a shaft fitted with a magnetized scale having a period of magnetization λ

    , a slide that is displaceable longitudinally along said shaft, the slide and the shaft each having a jaw, an electronic circuit mounted on said slide and being powered by a source which is internal to said portable electronic precision caliper, said electronic circuit comprising a single sensor, said sensor comprising an array of n magnetoresistive electrodes disposed opposite said scale so that values of resistances of the magnetoresistive electrodes are a function of their longitudinal position along the scale, n being greater than two, said magnetoresistive electrodes being integrated in said sensor, said electronic circuit being able to determine, from the values of resistance of the magnetoresistive electrodes, information depending on a gap between said jaws and to display this information on said electronic display.

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