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US 2008/0290262 A1Published application
Scale for a position-measuring device and position-measuring device
AssigneeDr. Johannes Heidenhain GmbH
InventorHeinz Tovar
Life of this patent
Estimating the term…
Abstract
A scale and a position-measuring device include the shifting of reference markings in graduation tracks, offset transversely with respect to the measuring direction, by fractions of the interval of the reference markings within a graduation track. It is thus possible to eliminate, or at least to markedly reduce, negative effects of the disturbance of the periodicity of a graduation track by the reference markings.
Claims14
A scale for a position-measuring device, comprising:
- a scale including at least two graduation tracks, each track being P-periodic in a measuring direction and including an integrated reference marking in the form of an interruption of the P-periodicity at evenly spaced first intervals;
- wherein the graduation tracks are offset transversely with respect to the measuring direction, and the integrated reference markings are staggered in the measuring direction.
A position-measuring device, comprising:
- a scale including at least two graduation tracks, each track being P-periodic in a measuring direction and including an integrated reference marking in the form of an interruption of the P-periodicity at evenly spaced first intervals, the graduation tracks being offset transversely with respect to the measuring direction, and the integrated reference markings being staggered in the measuring direction;
- and
- a patterned detector configured to scan the scale to generate electrical signals to form a position value, the detector including a plurality of detector tracks configured to scan the graduation tracks, the detector tracks being offset transversely to the measuring direction, each detector track, for a plurality of periods of the graduation tracks, including a plurality of m sensors per period arranged one after another in the measuring direction.
Dependencies are inferred from the claim text.