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Micromechanical acceleration sensor

  • US 5,905,203 A
  • Filed: 09/30/1996
  • Issued: 05/18/1999
  • Est. Priority Date: 11/07/1995
  • Status: Expired due to Term
First Claim
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1. Acceleration sensor comprising a first silicon semiconductor wafer;

  • a microelectronic evaluation unit including first and second electrodes for creating a variable capacitance on a first surface of the first semiconductor wafer;

    a second SOI semiconductor wafer having a movable third electrode formed therein, with said second semiconductor wafer being mounted on said first surface of said first semiconductor wafer such that said moveable electrode is disposed opposite and spaced from said first and second electrodes and is electrically connected to said evaluation unit; and

    wherein;

    said movable electrode is a rocker suspended asymmetrically with regard to an axis of rotation such that each respective portion of the rocker on a respective side of said axis of rotation is of a different length and is opposite one of said first and second electrodes on said first surface of said first semiconductor wafer;

    a closed ring structure is disposed on the surface of the silicon wafer; and

    , the closed ring structure of the silicon wafer is made of the material of a top metallization layer of the silicon wafer.

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