Acceleration sensor
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United States of America Patent
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-
Sep 22, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Nov 8, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An acceleration sensor has a spherical inertial mass (2) formed of a magnetic material. A magnet (3) has a holding part (3a) for normally holding the inertial mass (2) seated thereat. A switch changeover member (5) is actuatable by the inertial mass (2) when the inertial mass (2) moves out of the holding part (3a) onto one surface (3b) of the magnet (3) upon exertion of acceleration having a predetermined or larger magnitude on the inertial mass (2), for changing the position of a switch (4). A magnetic member (6) is secured to the other surface (3c) of the magnet (3), with one end thereof located in the holding part (3a), and the other end thereof shaped to cover an opposed end of the magnet (3), in a manner such that magnetic lines of force are generated in a manner being concentrated around the holding part (3a) of the magnet (3) and on the opposed end of same. Alternatively, the inertial mass (2) is normally mechanically held at a holding part (3a, 5e), and the magnetic member (6) has one end thereof shaped to cover an opposed and of the magnet (3), in a manner such that magnetic lines of force are generated in a manner being concentrated solely on the opposed end of the magnet.
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