Position measuring device

A method for position measurement, the method comprising:

• scanning a code by a plurality of detectors so as to generate scanning signals, wherein said code comprises a sequence of code elements of equal width B and disposed in a measurement direction, wherein said sequence of codes elements comprises:
• a first set of code elements comprising a first property;
• and
• a second set of code elements comprising a second property, wherein said first set and said second set of code elements are each being disposed aperiodically,
• forming a code word from said scanning signals, wherein said code word defines an absolute position;
• forming at least an incremental signal from said scanning signals, wherein said forming comprises:
• obtaining a set of scanning signals at scanning positions in a spacing matrix;
• converting said set of scanning signals into intermittently periodic partial signals;
• and
• combining said intermittently periodic partial signals to form said incremental signal.

A position measuring device comprising:

• a code comprising a sequence of code elements of equal width B that is disposed in a measurement direction, wherein said sequence of codes elements comprises:
• a first set of code elements comprising a first property;
• and
• a second set of code elements comprising a second property, wherein said first set and said second set of code elements are each disposed aperiodically;
• a scanning unit comprising a plurality of detectors for scanning said code and obtaining scanning signals, and for forming a code word defining an absolute position from said scanning signals;
• and
• an arrangement for forming incremental signals from said scanning signals, phase-shifted by 90° from each other, wherein a majority of said plurality of detectors are assigned over a distance equal to B, and said scanning signals are delivered to a selector device, which as a function of a position datum derived from said incremental signals, selects a set of scanning signals from said scanning signals that are suitable for forming said code word.

A position measuring device comprising:

• a code comprising a sequence of code elements of equal width B that is disposed in a measurement direction, wherein said sequence of codes elements comprises:
• a first set of code elements comprising a first property;
• and
• a second set of code elements comprising a second property, wherein said first set and said second set of code elements are each disposed aperiodically,
• a scanning unit comprising a plurality of detectors for scanning said code and obtaining scanning signals, and for forming a code word defining an absolute position from said scanning signals, and
• a circuit for forming at least a periodic incremental signal from said scanning signals, wherein said formed periodic incremental signal has a period of 2×B.