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Headphone apparatus

  • US 5,327,507 A
  • Filed: 04/04/1991
  • Issued: 07/05/1994
  • Est. Priority Date: 04/10/1990
  • Status: Expired due to Fees
First Claim
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1. A headphone apparatus comprising:

  • a diaphragm,a driving portion forming a first space between said driving portion and said diaphragm,a first wall provided to form a second space between said driving portion and said first wall, said second space communicating with said first space via holes,a second wall provided to form a third space between said first wall and said second wall,wherein said first wall includes through-holes communicating said second space with third space, and said third space is separated from external space by said second wall which seals and encloses said through-holes from said external space, so that waves of high frequency emitted via said through-holes do not pass to the external space, the capacity of said third space is greater than said second space and the capacity of said third space is ten times that of said second space.

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