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Patent Searching and Data


Title:
ELECTROMAGNETIC ACOUSTIC TRANSDUCER
Document Type and Number:
Japanese Patent JPH10149169
Kind Code:
A
Abstract:

To provide the electromagnetic acoustic transducer which is prevented from deteriorating in acoustic performance owing to a reflow solder process.

A decrease in the lowest resonance frequency Fo of a resonance plate 22 by the demagnetization of a magnet 10 and an increase in the lowest resonance frequency Fo of the resonance plate 22 due to the heat shrinkage of a support ring 20 are canceled by the irreversible demagnetization at a reflow solder process temperature that the magnet 10 has and by the heat shrinkage at the reflow solder process temperature that the support ring 20 has, to suppress variation in the lowest resonance frequency Fo of the resonance plate 22, thereby stabilizing acoustic performance.


Inventors:
TAJIMA KAZUSHIGE
IMAHORI TAKAO
SONE TAKAHIRO
FUSHIMI ISAO
Application Number:
JP30941596A
Publication Date:
June 02, 1998
Filing Date:
November 20, 1996
Export Citation:
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Assignee:
STAR MFG CO
International Classes:
H04R11/04; H04R13/00; G10K9/13; (IPC1-7): G10K9/13; H04R13/00
Attorney, Agent or Firm:
Shoichi Unemoto