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Encoder readhead

  • US 9,797,751 B2
  • Filed: 03/01/2010
  • Issued: 10/24/2017
  • Est. Priority Date: 03/02/2009
  • Status: Active Grant
First Claim
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1. A readhead arranged to read an absolute scale encoding a series of data bits, the readhead comprising:

  • a plurality of sensors that are each arranged to produce a sensor signal indicative of measured magnetic field strength;

    a plurality of signal combiners, each signal combiner being arranged to receive at least two of the sensor signals produced by the plurality of sensors and to produce therefrom a combined sensor signal, the plurality of signal combiners thereby generating a plurality of combined sensor signals;

    a plurality of data bit extractors for generating absolute position data and arranged to receive the plurality of combined sensor signals, each data bit extractor being arranged to receive at least two of the combined sensor signals and to determine the value of a data bit encoded in an associated absolute scale; and

    an incremental signal generator arranged to receive at least two of the plurality of combined sensor signals also received by the data bit extractors and to generate at least one incremental signal from the at least two combined sensor signals.

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