发明授权
US07892876B2 Three-axis accelerometers and fabrication methods 有权
三轴加速度计和制造方法

  • 专利标题: Three-axis accelerometers and fabrication methods
  • 专利标题(中): 三轴加速度计和制造方法
  • 申请号: US12503382
    申请日: 2009-07-15
  • 公开(公告)号: US07892876B2
    公开(公告)日: 2011-02-22
  • 发明人: Mehran Mehregany
  • 申请人: Mehran Mehregany
  • 申请人地址: US MA Marlborough
  • 专利权人: Qualtre, Inc.
  • 当前专利权人: Qualtre, Inc.
  • 当前专利权人地址: US MA Marlborough
  • 代理机构: Burns & Levinson LLP
  • 代理商 Bruce D. Jobse, Esq.
  • 主分类号: H01L21/00
  • IPC分类号: H01L21/00 H01L21/56
Three-axis accelerometers and fabrication methods
摘要:
Disclosed are MEMS accelerometers and methods for fabricating same. An exemplary accelerometer comprises a substrate, and a proof mass that is a portion of the substrate and which is separated from the substrate surrounding it by a gap. An electrically-conductive anchor is coupled to the proof mass, and a plurality of electrically-conductive suspension anus that are separated from the proof mass extend from the anchor and are coupled to the substrate surrounding the proof mass. A plurality of sense and actuation electrodes are separated from the proof mass by gaps and are coupled to processing electronics. Capacitive sensing is used to derive electrical signals caused by forces exerted on the proof mass, and the electrical signals are processed by the processing electronics to produce x-, y- and z-direction acceleration data. Electrostatic actuation is used to induce movements of the mass for force balance operation, or self-test and self-calibration. The fabrication methods use deep reactive ion etch bulk micromachining and surface micromachining to form the proof mass, suspension arms and electrodes. The anchor, suspension arms and electrodes are made in the same process steps from the same electrically conductive material, which is different from the substrate material.
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