Vibration sensing element and vibration sensor
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United States of America Patent
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-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Jul 25, 1997
filing date -
Feb 16, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vibration sensing element includes a hermetically sealed case, a fixed electrode member made of a nonmagnetic electrically conductive material and fixed to the case with its tip portion projecting into the case, a movable electrode member made of an electrically conductive magnetic metal material exhibiting elasticity and fixed to the case with its tip portion projecting into the case and making pressure contact with the fixed electrode member, and a magnetic member disposed to face the movable electrode member. A glass breakage sensor includes a casing for attachment to the glass, the vibration sensing element, and a resin molding encasing the vibration sensing element. The contact pressure between the fixed and movable electrode members can be noninvasively checked by applying a magnetic field thereto.
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