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Optical input using internal reflection surfaces

  • US 8,810,515 B2
  • Filed: 05/24/2010
  • Issued: 08/19/2014
  • Est. Priority Date: 05/26/2009
  • Status: Active Grant
First Claim
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1. An optical navigation device, comprising:

  • a radiation source capable of producing a beam of radiation;

    a sensor for receiving an image; and

    an optical element for identifying movement of a feature to thereby enable a control action to be carried out;

    wherein the optical element comprises at least one biconic surface for directing radiation from the radiation source to at least one F-TIR surface, wherein the at least one biconic surface and the F-TIR surface are angled with respect to each other;

    wherein the optical element comprises at least one additional planar surface for directing radiation from the F-TIR surface to the sensor, wherein the at least one additional planar surface and the F-TIR surface are angled with respect to each other;

    wherein the radiation measured at the sensor is radiation which is totally internally reflected at the at least one biconic surface, the F-TIR surface, and the at least one additional planar surface;

    wherein an imaged area of the F-TIR surface is stretched along a first direction corresponding to a direction of a longitudinal axis of the imaged area, and the image received on the sensor is compressed along the longitudinal axis; and

    wherein radiation from the F-TIR surface is reflected off the at least one additional planar surface and focused on the sensor between a circle of least confusion and a position where spatial frequencies in a second direction appear sharper than spatial frequencies in said first direction.

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