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Digital pen using interferometry for relative and absolute pen position

  • US 6,592,039 B1
  • Filed: 08/23/2000
  • Issued: 07/15/2003
  • Est. Priority Date: 08/23/2000
  • Status: Expired due to Fees
First Claim
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1. A hand held input device, comprising:

  • a body;

    at least one laser oriented on the body to direct light onto a substrate against which the body can be positioned;

    at least one diffraction grating reflecting at least one reference beam and passing at least one reflected beam from the substrate;

    at least one translation detector receiving interference patterns of light generated by the combination of the reflected beam and the reference beam;

    at least one bar code detector receiving a bar code beam from the substrate; and

    a processor receiving signals from the detectors.

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