Geophone and method of manufacturing a geophone

Details Geophone and method of manufacturing a geophone Geophone and method of manufacturing a geophone

2006-08-29

2006-08-29

Edwards, Jr., Timothy (Department: 2612)

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

C367S183000, C702S014000, C137S082000

Reexamination Certificate

active

07099235

ABSTRACT:
A vibration transducer such as a geophone, comprising a central pole piece (110) with a magnet (112) and coil (118) concentrically arranged around it. The position of the magnet (112) is fixed relative to the pole piece (110) and the coil (118) is movable relative to the magnet (112). A method of manufacturing a vibration transducer is characterised in that a bobbin carrying the coils is formed from a substantially tubular body which is positioned on a mandrel and at least one coil is wound around its outer surface, the mandrel being removed from the bobbin when the coil is complete. Another method is characterised in that the coil is formed separately and the bobbin is formed from a substantially tubular body which is positioned inside the coil and expanded to contact the coil when in position.

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