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Acceleration sensor and method of manufacturing same

  • US 20040085000A1
  • Filed: 10/27/2003
  • Published: 05/06/2004
  • Est. Priority Date: 01/12/2001
  • Status: Active Grant
First Claim
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1. An acceleration sensor comprising:

  • a piezoelectric element which is formed by stacking an even number of piezoelectric layers greater than or equal to four layers;

    support members for supporting both ends of the piezoelectric element in the longitudinal direction; and

    electrodes which are provided in between the layers and on the front and back faces of the piezoelectric element, wherein the interlayer electrodes include an electrode which is segmented into portions in the longitudinal direction near inflection points between an expansion stress and a contraction stress applied to the piezoelectric element in response to the application of an acceleration and lead electrodes led to the ends of the piezoelectric element in the longitudinal direction, the two types of interlayer electrodes are alternately stacked with the piezoelectric layers therebetween, the interlayer electrode in the middle of the piezoelectric element in the thickness direction is the segmented electrode, the electrodes on the front and back faces of the piezoelectric element are led to the ends of the piezoelectric element in the longitudinal direction in order to extract generated charge, and the piezoelectric layers are polarized in the thickness direction so that, when the acceleration is applied, charge having the same polarity is extracted from the lead electrodes led to the ends in the longitudinal direction in the piezoelectric layers on both sides of the lead electrodes and so that the center portion and both end portions of each piezoelectric layer are polarized in opposite directions.

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