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Process for determining the location of a positioning body in relation to a reference body and device for implementing the process

  • US 5,598,268 A
  • Filed: 03/03/1995
  • Issued: 01/28/1997
  • Est. Priority Date: 07/31/1992
  • Status: Expired due to Fees
First Claim
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1. A process for determining a location of a positioning body in relation to a reference body, said process comprising the steps of:

  • providing on a positioning body a scale with marks of known coordinates in a plane;

    providing a scanner on the reference body, the scanner including a projection surface, on which the marks of a scale are projected, and an imaging lens;

    calculating coordinates of a center of projection of the imaging lens from the known coordinates of the marks on the scale via a projecting relationship between the projection surface of the scanner and the plane of the scale, whereby the marks provide their coordinate information with respect to the scale in coded form and are decoded for the calculation,wherein the scale comprises two orthogonal surface scales;

    wherein the marks of both surface scales form intersection regions; and

    wherein the calculation is based on at least four centers of intersection regions of the marks of both surface scales defining an area as the known coordinates of the marks.

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