Absolute position transducer having a non-binary code-track-type scale
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United States of America Patent
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-
Aug 7, 2001
Grant Date -
Jun 14, 2001
app pub date -
Mar 16, 1999
filing date -
Mar 16, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An absolute position transducer system has two members movable relative to each other and includes a code track transducer and at least one fine wavelength transducer. The code track is arranged to form a sequential pattern of base-N code words, where N is greater than two (i.e., non-binary). Each sequential non-binary code word identifies an absolute position of one member with respect to the other at a first resolution. Alternatively, the code track is arranged to form a pseudo-random non-binary code word pattern. In this case, the transducer system compares a non-binary code word with a look-up table to determine an absolute position of one member with respect to the other at a first resolution. In order to generate a non-binary code word pattern, code track transducer employs different-sized flux disrupters, different-sized flux enhancers, or a combination of flux disrupters and enhancers.
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