Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1995-08-11
1997-07-29
Bennett, G. Bradley
Geometrical instruments
Distance measuring
Scale reading position sensor
G01B 1102
Patent
active
056511876
ABSTRACT:
A position measuring system in which a scale has a reference mark track with two different sequences of reference marks are provided adjacent to an incremental division track. A first sequence of reference marks are disposed at successively different intervals and a second sequence of reference marks are disposed at equal intervals. Two modes of operation are available where either the absolute position is determined by scanning either the first sequence of reference marks or the second sequence of reference marks.
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Bennett G. Bradley
Dr. Johannes Heidenhain GmbH
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