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Hinged MEMS diaphragm

  • US 9,554,213 B2
  • Filed: 11/09/2015
  • Issued: 01/24/2017
  • Est. Priority Date: 10/01/2012
  • Status: Active Grant
First Claim
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1. A micromechanical structure, comprising:

  • a substrate having a through hole;

    a residual portion of a sacrificial oxide layer peripheral to the through hole formed on the substrate; and

    a polysilicon layer overlying the through hole, patterned to have;

    a planar portion;

    at least one supporting portion connecting the planar portion overlying the through hole to a portion of the polysilicon layer supported on the residual portion of the sacrificial oxide layer peripheral to the through hole, the at least one supporting portion being configured to permit movement of the planar portion with respect to the substrate;

    a first pattern of polysilicon stiffeners formed extending beneath the planar portion overlying the through hole, the first pattern of polysilicon stiffeners having a first depth and being configured to stiffen the planar portion; and

    a second pattern of polysilicon ribs selectively disposed proximate to the at least one supporting portion, attached near a periphery of the planar portion, wherein the polysilicon ribs extend from the planar portion to a depth beyond a depth of the polysilicon stiffeners, and extend laterally beyond an edge of the planar portion.

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