Speaker

Details Speaker Speaker

2006-02-28

2006-02-28

Tran, Sinh (Department: 2646)

Electrical audio signal processing systems and devices

Loudspeaker feedback

C381S190000, C381S397000

Reexamination Certificate

active

07006640

ABSTRACT:
A pole piece19of a speaker main unit1has a pole19aengaged with a bobbin14from the back side of a diaphragm12, and a flange19bhorizontally expanding from the base of the pole19a. In the pole19ais formed a through hole19cpassing therethrough in an axial direction thereof, and in the bottom end of the through hole19cis provided with a taper19dwhich widens with it goes downward. A thin film piezoelectric element4is provided such that the element covers an external opening19eof the through hole19c, and one end4aof a thin film piezoelectric element4is adhered to the bottom surface of the flange19b.

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patent: 57-119596 (1982-07-01), None
patent: 63092200 (1988-04-01), None
patent: 05-030596 (1993-02-01), None

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