Microphone

Details Microphone Microphone

2007-10-26

2011-10-18

Booth, Richard A. (Department: 2812)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Housed microphone

C381S173000, C381S174000

Reexamination Certificate

active

08041065

ABSTRACT:
The acoustic resistance inside the microphone of the present invention can be adjusted mechanically by a simple electrical operation from the outside, and thereby directivity can be changed easily without adversely affecting the acoustic characteristic, even if the microphone is a single directivity dynamic type microphone. The microphone has a front acoustic terminal and a rear acoustic terminal, and makes directivity variable by having an acoustic resistance changing unit of the rear acoustic terminal. The acoustic resistance changing unit has a piezoelectric element arranged in opposition to the rear acoustic terminal with an air layer in between, and makes the acoustic resistance of the rear acoustic terminal variable by varying a voltage to be applied to the piezoelectric element. The rear acoustic terminal opens in a flat part formed in a microphone unit constituent part, and it is recommended to arrange the acoustic resistance changing unit with a narrow air layer between the flat part and the acoustic resistance changing unit.

REFERENCES:
patent: 6985597 (2006-01-01), Akino
patent: 7773762 (2010-08-01), Akino
patent: 2008/0101630 (2008-05-01), Akino
patent: 6-339192 (1994-12-01), None
patent: 7-143595 (1995-06-01), None
patent: 2005-184347 (2005-07-01), None
U.S. Appl. No. 11/477,914, filed Jun. 30, 2006.

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