Electro-optical systems for control of robots, manipulator arms and co-ordinate measuring machines

  • US 4,453,085 A
  • Filed: 05/11/1981
  • Issued: 06/05/1984
  • Est. Priority Date: 05/11/1981
  • Status: Expired due to Term
First Claim
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1. A method for correcting position data of a machine having a member moveable in at least two co-ordinate axes, said machine comprising encoder means for providing rough position data to indicate the rough position of said member in each of said axes, said method comprising the steps of:

  • moving said moveable member to a position data correction location;

    electro-optically determining the actual position of said member in at least one axis relative to a reference point external to said machine;

    generating a signal representative of the electro-optically determined actual position of said member in the determined axis;

    utilizing said signal to correct the rough position data in said encoder means for the determined axis; and

    further moving said member to a precise desired position in the determined axis as indicated by said corrected position data.

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