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Contact sensing device

  • US 7,043,096 B2
  • Filed: 10/18/2004
  • Issued: 05/09/2006
  • Est. Priority Date: 05/25/1999
  • Status: Expired due to Fees
First Claim
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1. A sensing device comprising:

  • a housing having a nib; and

    a position sensor, mounted in the housing, for generating position data when the nib is positioned in contact with a surface having coded data disposed therein or thereon, the coded data being indicative of a plurality of locations within a region and the position data being indicative of the position of the nib relative to the region, the position sensor comprising;

    imaging optics;

    an image sensor; and

    a processor,wherein the position sensor is configured to generate the position data by;

    capturing, using the image sensor and via the imaging optics, at least one image of at least some of the coded data in the vicinity of the nib;

    determining, using the processor and from at least the at least one image, data indicative of a rotation and position of the region relative to the imaging optics;

    determining, using the processor and from the data and a known relationship between the imaging optics and the nib, the position of the nib relative to the region; and

    generating, using the processor and from the position of the nib, the position data.

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