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Audio speaker

  • US 4,924,504 A
  • Filed: 11/19/1987
  • Issued: 05/08/1990
  • Est. Priority Date: 06/18/1987
  • Status: Expired due to Fees
First Claim
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1. An audio transducer comprising:

  • a frame having a central open area,a substantially planar, thin, flexible film forming a central portion thereof supported by said frame within said open area of said frame,means for imparting a motion to a drive area of said diaphragm in a direction normal to the plane of the diaphragm, said drive area being small relative to the supported portion of the diaphragm whereby waves are created in said diaphragm and radiate away from said drive area in the form of a number of waves travelling at the same time toward said frame,said motion imparting means being a line source drive in the form of a centrally disposed linear coil provided by a plurality of juxtaposed, parallel conductors affixed to and extending for a distance along said diaphragm,a stationary elongated magnetic means supported adjacent said coil and defining a gap receiving said coil, anda pair of members varying a mass along their lengths provided on immediate opposite sides and extending the length of said linear coil.

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