Scale and position measuring system for absolute position determination
AssigneeDr. Johannes Heidenhain GmbH
InventorsElmar Mayer, Ulrich Benner
Life of this patent
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Abstract
A scale which is suitable for an absolute position determination, the scale includes a track which extends in at least one measuring direction and in which graduation areas of identical width and different optical properties are alternatingly arranged. At least first, second and third graduation areas with different optical properties that are arranged in the track, wherein a first logical signal is unequivocally assigned to a first combination of two successive different graduation areas, and a second logical signal is unequivocally assigned to a second combination of two successive different graduation areas, and wherein the first and second combinations differ from each other.
Claims21
A scale which is suitable for an absolute position determination, comprising:
- a track which extends in at least one measuring direction and in which graduation areas of identical width and different optical properties are alternatingly arranged;
- at least first, second and third graduation areas with different optical properties that are arranged in said track, wherein a first logical signal is unequivocally assigned to a first combination of two successive different graduation areas, and a second logical signal is unequivocally assigned to a second combination of two successive different graduation areas, and wherein said first and second combinations differ from each other.
A position measuring system for absolute position determination, comprising:
- a scale comprising:
- a track which extends in at least one measuring direction and in which graduation areas of identical width and different optical properties are alternatingly arranged;
- and
- at least first, second and third graduation areas with different optical properties that are arranged in said track, wherein a first logical signal is unequivocally assigned to a first combination of two successive different graduation areas, and a second logical signal is unequivocally assigned to a second combination of two successive different graduation areas, and wherein said first and second combinations differ from each other;
- and
- a scanning unit, which is movable in relation to said scale in a measuring direction and determines an absolute position of said scanning unit in relation to said scale by scanning said scale.
Dependencies are inferred from the claim text.