×

Solid state condenser and microphone devices

  • US 5,490,220 A
  • Filed: 05/05/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 03/18/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A solid state condenser device comprising:

  • a backplate constituting a fixed electrode in a parallel plate condenser;

    a diaphragm having a thickness, said diaphragm being sensitive to incident sound pressure waves, said diaphragm constituting a moveable electrode in said parallel plate condenser; and

    means comprising a keeper, said keeper being formed of a thin-film dielectric and having a keeper gap to receive said diaphragm in operative positional relationship with said backplate, said keeper gap having a thickness greater than the thickness of said diaphragm to retain said diaphragm without physical attachment thereto, to avoid applying appreciable tension to said diaphragm.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×