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Optical navigation sensor with variable tracking resolution

  • US 7,728,816 B2
  • Filed: 07/10/2006
  • Issued: 06/01/2010
  • Est. Priority Date: 07/10/2006
  • Status: Active Grant
First Claim
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1. A method of sensing motion of an optical sensor relative to a surface, the method comprising:

  • setting a first resolution and a second resolution;

    obtaining measurement signals from a sensor array; and

    tracking the motion of the optical sensor relative to the surface using the measurement signals,wherein the tracking of the motion in a first dimension is performed at the first resolution, and the tracking of the motion in a second dimension is performed at the second resolution,wherein the tracking of the motion in the first dimension is performed using a first division operation, and wherein the tracking of the motion in the second dimension is performed using a second division operation, andwherein the first division operation comprises dividing a measured displacement along the first dimension by a first divisor to obtain a first output and a first remainder, and wherein the second division operation comprises dividing a measured displacement along the second dimension by a second divisor to obtain a second output and a second remainder.

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