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Free space pointing devices with tilt compensation and improved usability

  • US 20050243062A1
  • Filed: 05/02/2005
  • Published: 11/03/2005
  • Est. Priority Date: 04/30/2004
  • Status: Active Grant
First Claim
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1. A handheld, pointing device comprising:

  • a first rotational sensor for determining rotation of said pointing device about a first axis and generating a first rotational output associated therewith;

    a second rotational sensor for determining rotation of said pointing device about a second axis and generating a second rotational output associated therewith;

    an accelerometer for determining an acceleration of said pointing device and outputting an acceleration output associated therewith; and

    a processing unit for receiving said first and second rotational outputs and said acceleration output and for;

    (a) converting said first and second rotational outputs and said acceleration output from a body frame of reference associated with said handheld pointing device into a user'"'"'s frame of reference in order to remove the effects of tilt associated with the manner in which a user is holding said handheld, pointing device; and

    (b) determining data associated with x and y coordinates which are in turn associated with movement of a screen cursor, said data based on said converted first and second rotational outputs and said converted acceleration output, wherein said step of converting renders said movement of said screen cursor substantially independent of an orientation in which a user holds said handheld device.

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