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    Optical device including faraday rotator
    11.
    发明授权
    Optical device including faraday rotator 有权

    公开(公告)号：US11635645B2

    公开(公告)日：2023-04-25

    申请号：US16810529

    申请日：2020-03-05

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Babak Amirsolaimani ,  Weichuan Gao

    IPC: G02F1/09 ,  G02B27/01 ,  G02F1/01 ,  G02B5/30 ,  G02B27/28

    Abstract: An optical assembly includes a first polarization-sensitive reflector, a second polarization-sensitive reflector, and a Faraday rotator. The first polarization-sensitive reflector is positioned to transmit light having a first polarization, and reflect light having a second polarization that is orthogonal to the first polarization. The second polarization-sensitive reflector is positioned to reflect light having a third polarization that is different from the first polarization and the second polarization, and transmit light having a fourth polarization that is orthogonal to the third polarization. The Faraday rotator is disposed between the first polarization-sensitive reflector and the second polarization-sensitive reflector so that the Faraday rotator converts: (i) the light having the first polarization into the light having the third polarization, (ii) the light having the third polarization into the light having the second polarization, and (iii) the light having the second polarization into the light having the fourth polarization.

    Optical combiner aberration correction in eye-tracking imaging
    12.
    发明授权
    Optical combiner aberration correction in eye-tracking imaging 有权

    公开(公告)号：US11550153B2

    公开(公告)日：2023-01-10

    申请号：US16854613

    申请日：2020-04-21

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Weichuan Gao ,  Chadwick Brian Martin ,  Robin Sharma ,  Byron Taylor

    IPC: G02B27/01 ,  G02B3/02 ,  G06F3/01

    Abstract: An optical assembly for an eye-tracking camera includes an aperture stop, a first optical surface, and a second optical surface. The optical assembly is configured to receive non-visible light reflected or scattered by an eye and to direct the non-visible light to an image sensor along an optical path, where the non-visible light is received from an optical combiner of an eye-tracking system. The first optical surface is disposed on the optical path and is configured to correct for field-independent optical aberrations induced by the optical combiner. The second optical surface is disposed on the optical path and is configured to correct for field-dependent optical aberrations induced by the optical combiner.

    Optical assembly for providing koehller illumination to a display
    14.
    发明授权
    Optical assembly for providing koehller illumination to a display 有权

    公开(公告)号：US11726365B1

    公开(公告)日：2023-08-15

    申请号：US16926444

    申请日：2020-07-10

    Applicant: META PLATFORMS TECHNOLOGIES, LLC

    Inventor： Ying Geng ,  Weichuan Gao

    IPC: G02B27/01 ,  G02B27/00 ,  G02F1/13357 ,  G02B27/28 ,  G02F1/1335

    CPC classification number: G02F1/13362 ,  G02B27/0172 ,  G02B27/0176 ,  G02B27/283 ,  G02B2027/015 ,  G02F1/133616

    Abstract: An illumination assembly includes one or more light sources and an optical assembly. The one or more light sources is configured to provide illumination light. The optical assembly includes a first optical component, a second optical component, and a third optical component. The first optical component, the second optical component, and the third optical component are positioned so that the illumination light is (i) received by the first optical component, (ii) transmitted through the first optical component toward the second optical component, (iii) reflected at the second optical component toward the third optical component, (iv) reflected at the third optical component toward the second optical component, and (v) transmitted through the second optical component. A method of providing illumination using an optical assembly is also disclosed.

    Optical assemblies having polarization volume gratings for projecting augmented reality content
    17.
    发明授权
    Optical assemblies having polarization volume gratings for projecting augmented reality content 有权

    公开(公告)号：US11624922B2

    公开(公告)日：2023-04-11

    申请号：US17326074

    申请日：2021-05-20

    Applicant: META PLATFORMS TECHNOLOGIES, LLC

    Inventor： Brian Wheelwright ,  Yun-Han Lee ,  Babak Amirsolaimani ,  Weichuan Gao

    IPC: G02B27/01

    Abstract: An optical assembly for projecting light output by a display includes an optical waveguide, a reflective optical element, and a in-coupler coupled with the optical waveguide. The reflective optical element is positioned to receive first light and to reflect the first light as second light. The in-coupler is positioned to receive the first light and transmit the first light toward the reflective optical element. The in-coupler is further positioned to receive the second light and redirect a first portion of the second light so that the first portion of the second light undergoes total internal reflection inside the optical waveguide. The reflective optical element includes a negative meniscus lens having a concave lens surface and a convex lens surface coupled with a reflective surface. The reflective optical element is positioned to focus the first light such that the second light is more collimated than the first light.

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