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Method of measuring the movement of an input device

  • US 20020104957A1
  • Filed: 11/06/2001
  • Published: 08/08/2002
  • Est. Priority Date: 11/06/2000
  • Status: Active Grant
First Claim
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1. A method of measuring the movement of an input device and an object relative to each other along at least one measuring axis, the method comprising the steps of:

  • illuminating an object surface with a measuring laser beam for each measuring axis, and converting a selected portion of the measuring beam radiation reflected by the surface into an electric signal, which is representative of the movement along said measuring axis, characterized in that measuring beam radiation reflected back along the measuring beam and re-entering the laser cavity, which emits the measuring beam, is selected and in that changes in operation of the laser cavity, which are due to interference of the re-entering radiation and the optical wave in the laser cavity and are representative of the movement, are measured.

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