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EYE TRACKING APPARATUS, METHOD AND SYSTEM

  • US 20150185475A1
  • Filed: 12/26/2013
  • Published: 07/02/2015
  • Est. Priority Date: 12/26/2013
  • Status: Active Grant
First Claim
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1. An apparatus for use in tracking an eye that is illuminated by infrared light, the apparatus comprising:

  • a waveguide that is transparent and includes an input-coupler and an output-coupler;

    wherein the input-coupler and the output-coupler are spatially separated from one another;

    wherein the input-coupler comprises a plurality of curved grating lines that diffract light beams incident on the input-coupler into the waveguide and towards a common region at which is located the output-coupler by way of total internal reflections;

    wherein the plurality of curved grating lines of the input-coupler have a radially varying pitch; and

    wherein the plurality of curved grating lines of the input-coupler each have a respective center of curvature and a respective point of convergence that are located within the region of the waveguide at which is located the output-coupler.

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