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Optical screen pointing device with inertial properties

  • US 20020130839A1
  • Filed: 03/16/2001
  • Published: 09/19/2002
  • Est. Priority Date: 03/16/2001
  • Status: Active Grant
First Claim
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1. An apparatus for controlling the position of a screen pointer for an electronic device having a display screen, the apparatus comprising:

  • an imaging surface against which a portion of the tip of a human digit may be placed;

    a light source for illuminating that portion of the tip of the digit that is placed against the imaging surface, thereby generating reflected images;

    a motion transducer;

    a lens for receiving the reflected images and directing the reflected images onto the motion transducer, the motion transducer generating digital representations of the reflected images, the motion transducer generating a first set of movement data based on the digital representations of the reflected images, the first set of movement data indicative of motion of the tip of the digit across the imaging surface; and

    a controller configured to generate a second set of movement data when the tip of the human digit is removed from the imaging surface, the second set of movement data indicative of motion of the tip of the digit across the imaging surface prior to removal of the tip.

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