Magnetic encoder for producing an index signal
First Claim
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1. A magnetic encoder comprising:
- a series of magnetic poles regularly spaced along a path to form a magnetic track, some of the magnetic poles being separated by regular pole junctions aligned uniformly with respect to the path of the magnetic track, the magnetic track having an edge; and
at least two of the magnetic poles being separated by an irregular pole junction, skewed with respect to the regular pole junctions such that a magnet sensor near the edge of the magnetic track will sense a wide pole and a narrow pole to allow an index signal to be produced.
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Abstract
Magnetic poles are regularly spaced along a path to form a magnetic track. Some of the magnetic poles are separated by regular pole junctions aligned uniformly with respect to the path of the magnetic track. At least two of the magnetic poles are separated by a skewed irregular pole junction aligned such that a sensor near an edge of the magnetic track will sense a wide pole and a narrow pole to allow an index signal to be produced.
53 Citations
4 Claims
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1. A magnetic encoder comprising:
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a series of magnetic poles regularly spaced along a path to form a magnetic track, some of the magnetic poles being separated by regular pole junctions aligned uniformly with respect to the path of the magnetic track, the magnetic track having an edge; and at least two of the magnetic poles being separated by an irregular pole junction, skewed with respect to the regular pole junctions such that a magnet sensor near the edge of the magnetic track will sense a wide pole and a narrow pole to allow an index signal to be produced. - View Dependent Claims (2)
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3. A magnetic encoder comprising:
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a series of magnetic poles regularly spaced along a path to form a magnetic track, some of the magnetic poles being separated by regular pole junctions aligned uniformly with respect to the path of the magnetic track, the magnetic track having an edge; and at least two of the magnetic poles being separated by an irregular pole junction, skewed with respect to the regular pole junctions such that a magnet sensor near the edge of the magnetic track will sense a wide pole and a narrow pole to allow an index signal to be produced, wherein the skewed irregular pole junctions include two parallel segments perpendicular to the path of the magnetic track and a stepped transition therebetween, oriented substantially along the path of the magnetic track to provide an offset between the two parallel segments. - View Dependent Claims (4)
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Specification