Coded data generation or conversion – Digital pattern reading type converter – Having combined coding pattern
Patent
1994-12-08
1996-11-12
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital pattern reading type converter
Having combined coding pattern
341 11, 341 13, 341 5, H03M 122
Patent
active
055744451
ABSTRACT:
A digital absolute position encoder is provided for determining absolute position of a first member with respect to a second member. The absolute position is determined within a resolution cell of L/2.sup.n, where n is an integer and L is a predetermined span. One of the members has a plurality of, m, tracks of binary indicia distributed over the predetermined span, L, where m is an integer less than n. The other member has a plurality of indicia detectors disposed on the second member for detecting the binary indicia. With such an arrangement, an encoder is provided having "a unit-distance code", yet uses less tracks than that used with a conventional Gray code encoder. Further, the encoder has a reduced number of transitions than that required on the track used with a conventional Gray code encoder. Both of these features simplify the design and fabrication for a given encoder resolution.
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Breen John J.
Froeschle Thomas A.
Maresca Robert L.
Parison, Jr. James A.
Perry Christopher H.
Bose Corporation
Gaffin Jeffrey A.
Kost Jason L. W.
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