Capacitor microphone

Details Capacitor microphone Capacitor microphone

2006-09-07

2011-11-15

Goins, Davetta (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S369000, C381S175000, C381S173000

Reexamination Certificate

active

08059842

ABSTRACT:
A capacitor microphone is constituted by a plate having a fixed electrode, a diaphragm including a center portion and at least one near-end portion that is fixed to the outer periphery, in which the center portion having a vibrating electrode, which is positioned relative to the fixed electrode and which vibrates in response to sound waves, is increased in rigidity in comparison with the near-end portion; and a spacer that is fixed to the plate and the near-end portion of the diaphragm and that has an air gap formed between the plate and the diaphragm. Alternatively, a diaphragm electrode is horizontally supported by extension arms extended from a circular plate thereof and is vertically held in a hanging state being apart from a fixed electrode with a controlled distance therebetween.

REFERENCES:
patent: 7466834 (2008-12-01), Ogura et al.
patent: 7466864 (2008-12-01), Nakaya
patent: 58-24300 (1983-02-01), None
patent: 7-284199 (1995-10-01), None
patent: 08-084396 (1996-03-01), None
patent: 8-240609 (1996-09-01), None
patent: 2004-506394 (2004-02-01), None
patent: 518900 (2003-01-01), None
patent: WO 02/052893 (2002-07-01), None
patent: WO 2005/111555 (2005-11-01), None
Toshifumi Tajima, et al., “Mechanical properties of capacitive silicon microphone,” NHK Science and Technical Research Laboratories (Nov. 2001), pp. 95-98.

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