Electromagnetic transducer apparatus
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United States of America Patent
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-
Nov 1, 2011
Grant Date -
Mar 11, 2010
app pub date -
Mar 14, 2007
filing date -
Mar 25, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electromagnetic transducer apparatus (10) includes a core (30, 31) providing a pair of yokes (34, 35) between which there is an air gap (38, 39), at least one coil (32) disposed about the core (30, 31), an armature (14) moveable in the air gap (38, 39) in response to the coil (32) being energised, the armature (14) being mounted between a pair of suspension springs (22, 23), and characterized in that the armature (14) includes a cylinder (14) in which is disposed a piston (12) which is immovable relative to the core (30, 31).
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