Title: Circular cone piezoelectric ear-phone
Application Number: 85100713 Application Date: 1985.04.01
Publication Number: 1002788 Publication Date: 1986.08.27
Approval Pub. Date: Granted Pub. Date: 1988.12.28
International Classifi-cation: H04R1/00,H04R17/00
Applicant(s) Name: Acoustics Inst., Chinese Academy of Sciences Address:
Inventor(s) Name:
Attorney & Agent: LIU WENYI
Abstract:
     The piezoelectric earth-phone with circular cone lump. The feature of the invention is adopted the circular cone lump of mass instead of the popular one with cylinder lump of mass. It also adopts a copper-tungsten alloy with high density and elasticity instead of copper or steel. Besides more reasonable static copacity of piezoelectric ceramic has been choosed. In the processing of sound insulation, it uses the casing of double-lager sound insulation to substitute the current single-layer one. In the technology, the smwothness and clearance of the part contact-surface are increased. As the result of high seusitivity, wide pass-band and better sound insulation character can be abtained.
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