Encoder
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United States of America Patent
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-
Sep 24, 2002
Grant Date -
Apr 25, 2002
app pub date -
Feb 9, 2001
filing date -
Feb 26, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An encoder includes a plurality of magnetic zones of alternating polarity. At the opposed ends of the encoder magnet are magnetic end zones that provide substantially symmetric magnetic fields. The encoder sensors include first and second sensors that are spaced apart from each other a distance functionally related to the distance between the magnetic end zones. A plurality of first and second sensors are arranged so that the encoder magnet may move relative to the sensors. Each of the first and second sensors provides an associated output signal in response to magnetic influence of the encoder magnet moving past each respective encoder sensor. When each of the first and second encoder sensors senses one of the magnetic end zones of the encoder magnet, the associated output signals are substantially symmetric.
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