Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1994-07-20
1995-09-12
Bentley, Stephen C.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
367187, H04R 1100
Patent
active
054503752
ABSTRACT:
A geophone is disclosed that has a cylindrical housing closed at one end by a bottom and the other end by a top. A magnet assembly with pole pieces at each end of the magnet is centrally mounted in the housing providing an annular space between the magnet assembly and the housing. A coil form is located in the annular space. Springs support the coil form for axial movement relative to the magnet assembly along the longitudinal axis of the housing. Washers are included on the upper and lower sides of each of the springs to enhance the life span of the springs by reducing the damage caused by torsional forces experienced by the springs during normal operation and rough handling. Also incorporated in the geophone are resilient members mounted between the coil form and the housing to prevent the coil form from directly hitting the housing and thereby reduce the amount of frequency shift experienced by the geophone over its life span.
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Bentley Stephen C.
Montgomery Christopher K.
Shaw Industries Limited
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