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Loudspeaker having a laminate diaphragm of three layers

  • US 4,122,314 A
  • Filed: 12/22/1977
  • Issued: 10/24/1978
  • Est. Priority Date: 12/23/1976
  • Status: Expired due to Term
First Claim
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1. A loudspeaker comprising:

  • a diaphragm including first and second layers and a core sandwiched between said layers, said core being secured to an inner surface of each of said layers to form a unitary structure therewith;

    means for vibrating said diaphragm in accordance with a varying electrical signal supplied thereto; and

    support means for supporting both said diaphragm and said means for vibrating;

    the improvement wherein each of said layers is formed of materials through which the velocity of propagation of a longitudinal wave is greater than 5000 m/sec. and wherein said core is formed of materials having a shearing elastic modulus Gco which exceeds the value ##EQU15## where Ef is the longitudinal elasticity of each of said layers,tf is the thickness of each of said layers,tc is the thickness of said core, andl is the length across the surface of said diaphragm.

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