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Embedded eye tracker with dichroic mirror

  • US 10,521,658 B2
  • Filed: 07/07/2017
  • Issued: 12/31/2019
  • Est. Priority Date: 07/07/2017
  • Status: Active Grant
First Claim
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1. An eyewear device comprising:

  • an optical element having a front surface, a back surface, a rim along an outer edge of the optical element, and an angled portion of the rim that is angled relative to the front surface and the back surface;

    one or more sources that emit light in a first band of light, the one or more sources configured to illuminate a portion of an eye of a user of the eyewear device;

    a dichroic mirror that is arranged parallel to the angled portion of the rim and abuts the angled portion of the rim, the dichroic mirror positioned off-axis from an axis that passes through the optical element to the eye, and the dichroic mirror is reflective in the first band of light, is transmissive in a second band of light, and is configured to direct light in the first band that is reflected from the portion of the eye toward a first position; and

    a camera located in the first position and the first position is located in a plane of the optical element, the camera configured to capture one or more images of the light in the first band reflected by the dichroic mirror.

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