Detector assembly for seismic marine survey
Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus Patent #: 4150262
ApplicationNo. 06/604493 filed on 04/27/1984
US Classes:381/151, Body contact wave transfer (e.g., bone conduction earphone, larynx microphone)367/166, Liquid filled367/171, Liquid filled transducer381/173Piezoelectric or ferroelectric
ExaminersPrimary: Rubinson, Gene Z.
Assistant: Byrd, Danita R.
Attorney, Agent or Firm
International ClassesH04R 1/00 (20060101)
H04R 1/46 (20060101)
H04R 17/02 (20060101)
G01H 11/08 (20060101)
G01H 11/00 (20060101)
Foreign Application Priority Data1983-05-04 JP
AbstractA pickup device for picking up vibration transmitted through bones or solid members in human, in which a piezoelectric element is mounted like a cantilever within a substantially rigid liquid-tight case filled with a viscous liquid in such a way that the free end of the piezoelectric element can vibrate with respect to the liquid-tight case. The viscosity of the viscous liquid ranges from 30 to 10,000 cs so that the sharpness of resonance of the piezoelectric element can be suitably suppressed.