Absolute encoder generating phase-shifted triangular waveforms to produce multi-bit signals
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United States of America Patent
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Dec 16, 1997
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N/A
app pub date -
Mar 13, 1995
filing date -
Mar 17, 1994
priority date (Note) -
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Abstract
An absolute encoder is provided with a movable member, which may be a disc, a photodetector and a processing circuit. The movable member has a plurality of tracks T arranged from higher to lower orders, each track having a bright and dark pattern. The photodetectors A1-A4 receive a light through the bright and dark patterns to output triangular detection signals A1-A4 associated with the track T. The processing circuit processes the detection signals A1-A4 to produce bit signals P1-P3 which indicate a position of the movable member. The processing circuit is provided with an input unit 1, a comparator unit 2 and a logic unit 3. The input unit 1 receives the detection signals A1-A4 for producing a plurality of triangular wave signals having the same period but different phases. The comparator unit 2 comparatively processes the triangular wave signals with each other to produce a plurality of rectangular wave signals having different phases. The logic unit 3 logically processes the rectangular wave signals with each other to output at least three bit signals P1-P3 from one track.
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