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    Compact catadioptric projector
    12.
    发明授权
    Compact catadioptric projector 有权

    公开(公告)号：US12007569B2

    公开(公告)日：2024-06-11

    申请号：US18139736

    申请日：2023-04-26

    Applicant: Snap Inc.

    Inventor： Miller Schuck ,  Robert Matthew Bates

    IPC: G02B27/01 ,  G02B5/30 ,  G02B27/28 ,  G02C11/00 ,  G09G3/00 ,  G06F3/01 ,  H04N13/239

    CPC classification number: G02B27/0172 ,  G02B5/3083 ,  G02B27/283 ,  G02C11/10 ,  G09G3/002 ,  G02B2027/014 ,  G02B2027/0178 ,  G06F3/012 ,  G06F3/013 ,  H04N13/239

    Abstract: A compact projector for eyewear including a refractive lens to achromatize an image and to reduce the size of the projector. The compact projector includes two total internal reflection (TIR) prisms, a polarizing beamsplitter, a quarter-wave plate, and the refractive lens combining refractive and reflective power, referred to as catadioptric. In one example, a light source generates light that is directed through a collector, into a first TIR prism, to the polarizing beamsplitter, and to a display panel. The display panel modulates the light and creates an image. The image is directed through the beamsplitter, into a second TIR prism, through a quarter-wave plate, and then to the refractive lens. The refractive lens reflects the image back into the second TIR prism, and which image then exits to a waveguide. In a second example, the display generates an illuminated image which is then processed as in the first example.

    Compact catadioptric projector
    15.
    发明授权
    Compact catadioptric projector 有权

    公开(公告)号：US11681148B2

    公开(公告)日：2023-06-20

    申请号：US17952485

    申请日：2022-09-26

    Applicant: Snap Inc.

    Inventor： Miller Schuck ,  Robert Matthew Bates

    IPC: G02B27/01 ,  G02B27/28 ,  G09G3/00 ,  G02B5/30 ,  G02C11/00 ,  G06F3/01 ,  H04N13/239

    CPC classification number: G02B27/0172 ,  G02B5/3083 ,  G02B27/283 ,  G02C11/10 ,  G09G3/002 ,  G02B2027/014 ,  G02B2027/0178 ,  G06F3/012 ,  G06F3/013 ,  H04N13/239

    Abstract: A compact projector for eyewear including a refractive lens to achromatize an image and to reduce the size of the projector. The compact projector includes two total internal reflection (TIR) prisms, a polarizing beamsplitter, a quarter-wave plate, and the refractive lens combining refractive and reflective power, referred to as catadioptric. In one example, a light source generates light that is directed through a collector, into a first TIR prism, to the polarizing beamsplitter, and to a display panel. The display panel modulates the light and creates an image. The image is directed through the beamsplitter, into a second TIR prism, through a quarter-wave plate, and then to the refractive lens. The refractive lens reflects the image back into the second TIR prism, and which image then exits to a waveguide. In a second example, the display generates an illuminated image which is then processed as in the first example.

    IMAGING LENS ASSEMBLY
    16.
    发明申请
    IMAGING LENS ASSEMBLY 有权

    公开(公告)号：US20220326472A1

    公开(公告)日：2022-10-13

    申请号：US17705884

    申请日：2022-03-28

    Applicant: Snap Inc.

    Inventor： Robert Matthew Bates

    IPC: G02B7/02 ,  G02B1/04 ,  G02B5/22 ,  G02B9/62 ,  G02B13/00

    Abstract: A multi-element imaging lens can be formed from five plastic elements, and an optional null-power or relatively low power sixth plastic element. The lens can use selected plastic materials to reduce a thermal focal shift. In the lens, negative refractive power elements can be formed from plastic materials having a relatively large negative refractive index variation with temperature, abbreviated as dn/dT, while positive refractive power elements can be formed from plastic materials having a relatively small negative dn/dT. Reducing the thermal focal shift, as disclosed, can eliminate the need for an auto-focusing device, such as a voice coil. Reducing the thermal focal shift, as disclosed, can also eliminate the need to use one or more glass elements to further reduce thermal focal shift, which can reduce cost for the lens.

    Projection lens with four glass elements having spherical surfaces
    17.
    发明授权
    Projection lens with four glass elements having spherical surfaces 有权

    公开(公告)号：US11378786B2

    公开(公告)日：2022-07-05

    申请号：US16678496

    申请日：2019-11-08

    Applicant: Snap Inc.

    Inventor： Robert Matthew Bates ,  Adam Douglas Greengard

    IPC: G02B13/16 ,  G02B9/34

    Abstract: A projection lens can include four lens elements, each lens element being formed from glass and including spherical or planar incident and exiting surfaces. Compared to a projection lens that uses three lens elements, the four-element projection lens has relaxed manufactured and alignment tolerances. Unlike a projection lens that uses one or more plastic elements or uses aspherical surfaces, the all-glass projection lens can be manufactured using relatively fast and inexpensive grinding and polishing techniques. One or two of the glass lens elements can optionally be formed symmetrically, so as to be reversible. One glass element can optionally be piano-convex. A right-angle prism can direct light from a video display into the four glass elements. An achromatic prism can angularly divert the optical axis by about eight degrees and can direct light out of the four glass elements into a near-eye waveguide.

    Imaging lens assembly
    18.
    发明授权
    Imaging lens assembly 有权

    公开(公告)号：US11287601B2

    公开(公告)日：2022-03-29

    申请号：US16483973

    申请日：2018-02-07

    Applicant: Snap Inc.

    Inventor： Robert Matthew Bates

    IPC: G02B9/62 ,  G02B7/02 ,  G02B1/04 ,  G02B5/22 ,  G02B13/00

    Abstract: A multi-element imaging lens can be formed from five plastic elements, and an optional null-power or relatively low power sixth plastic element. The lens can use selected plastic materials to reduce a thermal focal shift. In the lens, negative refractive power elements can be formed from plastic materials having a relatively large negative refractive index variation with temperature, abbreviated as dn/dT, while positive refractive power elements can be formed from plastic materials having a relatively small negative dn/dT. Reducing the thermal focal shift, as disclosed, can eliminate the need for an auto-focusing device, such as a voice coil. Reducing the thermal focal shift, as disclosed, can also eliminate the need to use one or more glass elements to further reduce thermal focal shift, which can reduce cost for the lens.

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