公开(公告)号：US20240192431A1

公开(公告)日：2024-06-13

申请号：US18532594

申请日：2023-12-07

Applicant: Snap Inc.

Inventor： Alexander Drayton ,  Marcell Kiss ,  Parashara Panduranga ,  Jamie Dean Reynolds ,  Cheng Shi

IPC: F21V8/00

CPC classification number: G02B6/005 ,  G02B27/0172

Abstract: In a thin film stack deposited on a substrate, a first layer can have a non-uniform thickness. A second layer, disposed so that the first layer is between the substrate and the second layer, can have a non-uniform thickness. A first pattern can be formed on the second layer to define first areas. The second layer can be etched in the first areas to form first holes having varying depths. A second pattern can be formed on the first layer in the first holes to define second areas. Each second area can be smaller than a corresponding first area. The first layer can be etched in the second areas to form second holes having varying depths. An imprint of the etched thin film stack can be formed such that the first holes and the second holes form a plurality of diffractive elements having varying sizes on the imprint.

公开(公告)号：US20250035924A1

公开(公告)日：2025-01-30

申请号：US18716461

申请日：2022-12-09

Applicant: Snap Inc.

Inventor： Ciaran Padraic Phelan ,  Matthew Proctor ,  Kai Wang ,  Parashara Panduranga ,  David Louis Maxime Poussin

IPC: G02B27/01 ,  F21V8/00

Abstract: A waveguide for use in an augmented reality or virtual reality display, comprising: a waveguide substrate layer having a planar surface; and a plurality of optical structures extending into or out of the planar surface;
wherein the plurality of optical structures are arranged in an array to provide at least one diffractive optical element in the waveguide, and the at least one diffractive optical element is configured to receive light from an input direction within the plane of the waveguide and to diffract a portion of the received light out of the waveguide towards a viewer;
wherein, in a plane defined by the input direction and a direction perpendicular to the planar surface, at least one of the optical structures has a cross-section comprising a top edge, a first side edge and a second side edge, the first side edge extends from the planar surface to a leading end of the top edge, the top edge extends from the leading end in a major direction parallel to the input direction to a following end, and the second side edge extends from the following end of the top edge to the planar surface,
wherein: the first side edge has a first oblique major direction away from the planar surface where the first oblique major direction is neither parallel to the planar surface nor perpendicular to the planar surface, and/or the second side edge has a second oblique major direction towards the planar surface where the second oblique major direction is neither parallel to the planar surface nor perpendicular to the planar surface.

公开(公告)号：US20240411069A1

公开(公告)日：2024-12-12

申请号：US18670486

申请日：2024-05-21

Applicant: Snap Inc.

Inventor： Akheelesh Kumar Abeeluck ,  Alexander Drayton ,  Marcell Kiss ,  Parashara Panduranga

IPC: G02B5/18

Abstract: A stepped diffraction grating and method for manufacturer thereof are disclosed. A plurality of parallel grating lines are each formed on a substrate surface by forming a plurality of stacked layers of optically transmissive material. In cross-section, each grating line has an upper layer having an upper surface having a first end and a second end; a bottom layer having a bottom surface abutting the substrate surface and an upper surface having a first end and a second end; a rising staircase portion extending at a rising staircase angle between 10 degrees and 60 degrees; and a falling staircase portion extending at a falling staircase angle between the rising staircase angle and 89 degrees.

公开(公告)号：US20220334396A1

公开(公告)日：2022-10-20

申请号：US17718059

申请日：2022-04-11

Applicant: Snap Inc.

Inventor： Arseny Alexeev ,  Cheng Shi ,  Christian William Olavi Sol ,  Parashara Panduranga ,  Venkata Karthik Nagareddy

IPC: G02B27/01 ,  G02B6/28

Abstract: An optical waveguide combiner includes an optical waveguide substrate and an optical input region. The optical input region includes an optical input diffractive grating integrated in, or disposed on, the optical waveguide substrate. An optical output region includes an optical output diffractive grating integrated in, or disposed on, the optical waveguide substrate, At least one non-diffractive region includes at least one optical non-diffractive array of nanostructures, wherein said at least one optical non-diffractive array of nanostructures is integrated in, or disposed on, the object side of said optical waveguide substrate and at least partially surrounds at least said optical output grating; wherein the external visible reflectance of said at least one non-diffractive array of nanostructures is substantially equal to the external visible reflectance of said optical output grating.