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Vibration actuator having an elastic member between a suspension plate and a magnetic circuit device

  • US 6,850,138 B1
  • Filed: 12/01/2000
  • Issued: 02/01/2005
  • Est. Priority Date: 12/02/1999
  • Status: Expired due to Fees
First Claim
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1. A vibration actuator including a magnetic circuit device with a magnetic gap, a vibrating member, a coil fixed to said vibrating member and disposed in said magnetic gap, a vibration transmitter, and a suspension plate for elastically suspending said magnetic circuit device to said vibration transmitter in a predetermined direction, said vibration actuator further comprising a primary elastic member interposed between said suspension plate and said magnetic circuit device in said predetermined direction,wherein said suspension plate has a central portion and a peripheral portion around said central portion, said peripheral portion being connected to said vibration transmitter, said central portion being connected to said magnetic circuit device through said primary elastic member, and wherein said suspension plate includes a leaf spring portion extending along a spiral curve between said central and said peripheral portions.

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