Object detecting device
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United States of America Patent
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Jun 20, 1995
Grant Date -
N/A
app pub date -
Aug 24, 1993
filing date -
Apr 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An object detecting device for detecting an object at least partly having a magnetic substance or magnetic-flux permeable material is formed of a detection coil arrangement including a primary coil for generating magnetic flux and a secondary coil disposed separately from the primary coil at a predetermined interval for receiving the magnetic flux from the primary coil; and a detection circuit for detecting an increase of the magnetic flux transmitted to the secondary coil due to presence of the object within a space between the primary and secondary coils. The detection circuit produces signal indicating the presence of the object upon detection of the presence.
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