Resonance chamber of a cellular phone

  • US 7,508,933 B2
  • Filed: 01/31/2005
  • Issued: 03/24/2009
  • Est. Priority Date: 02/03/2004
  • Status: Active Grant
First Claim
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1. A cellular telephone device comprising:

  • a shell, enclosing an inner space;

    a print circuit board (PCB), disposed within the shell to divide the inner space into a first acoustic cavity formed in front of the PCB and a second acoustic cavity formed behind the PCB, having a through hole to communicate the first acoustic cavity and the second acoustic cavity; and

    a speaker, disposed within the first acoustic cavity and separated from the PCB to divide the first acoustic cavity into a front acoustic cavity in front of the speaker and a rear acoustic cavity between the speaker and the PCB;

    wherein both the rear acoustic cavity and the second acoustic cavity formed behind the speaker are communicated with each other by the through hole.

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