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Movable touchpad with high sensitivity

  • US 8,125,449 B2
  • Filed: 12/16/2009
  • Issued: 02/28/2012
  • Est. Priority Date: 12/16/2009
  • Status: Active Grant
First Claim
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1. A highly sensitive movable touchpad for a digital apparatus having a cursor, comprising:

  • a slidable template having a front surface exposed and a back surface with a specific texture;

    a limiting member, for limiting the slidable template within a moving range and providing the slidable template with a low friction, surrounding the slidable template and exposing central portion of the front surface of the slidable template;

    an optical displacement detecting device, located below the slidable template, for detecting movement of the slidable template, including;

    a light source, for emitting light beams to illuminate the back surface of the slidable template;

    an image sensor for receiving speckle images formed by light beams scattered by the back surface; and

    an image processor for obtaining relative location, moving direction and speed of the slidable template by comparison of the speckle images; and

    a control unit for controlling corresponding movement of the cursor of the digital apparatus according to the relative location, moving direction and speed obtained from the image processor.

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