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Electro-acoustic planar transducer

  • US 4,385,210 A
  • Filed: 09/19/1980
  • Issued: 05/24/1983
  • Est. Priority Date: 09/19/1980
  • Status: Expired due to Term
First Claim
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1. An electro acoustic planar transducer comprising:

  • a. a substantially planar frame having a front side and a rear side;

    b. means for mounting said frame on a vertical planar surface so that said front side faces away from the planar surface;

    c. a planar, rectangular, woofer diaphragm, the long dimension of said woofer diaphragm being in vertical attitude, said woofer diaphragm having a vertical proximal edge and an opposite vertical distal edge;

    d. means for mounting said woofer diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side, said proximal edge being mounted on said frame and said distal edge being movable;

    e. first cooperating coil and magnet means, interposed between said frame and said woofer diaphragm, for driving said woofer diaphragm in response to an electrical signal impressed upon said first coil means, said distal edge partaking in excursions as said woofer diaphragm is driven;

    f. sound absorptive means mounted on said frame and interposed between at least one predetermined portion of said woofer diaphragm and said planar surface for attenuating the acoustic back waves generated by said predetermined portion of said woofer diaphragm;

    g. a planar tweeter diaphragm;

    h. means for mounting said tweeter diaphragm on and parallel to said frame for alternating movement toward and away from said front side and said rear side; and

    ,i. second cooperating coil and magnet means interposed between said frame and said tweeter diaphragm for driving said tweeter diaphragm in response to said electrical signal impressed upon said second coil means.

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