Patent ID: 11927766
Assignee: META PLATFORMS TECHNOLOGIES, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A head mounted display comprising:
a lens assembly that transmits scene light to an eyebox, wherein the lens assembly include a scene side and an eyebox side;
a frame that carries the lens assembly and that positions the lens assembly near the eyebox; and
an eye tracking system including:
an image sensor positioned in-field to the eyebox and within the lens assembly, wherein the image sensor receives reflected light that is reflected from the eyebox; and
an optical element carried by the lens assembly, wherein the optical element receives scene light and directs the scene light towards the eyebox and around the image sensor,
wherein the optical element is positioned between the eyebox and the image sensor to at least partially conceal the image sensor from the eyebox,
wherein the optical element is a diffractive optical element configured to direct scene light towards the eyebox and transmit infrared wavelengths of the reflected light to the image sensor.