公开(公告)号：US20250004289A1

公开(公告)日：2025-01-02

申请号：US18697661

申请日：2022-09-29

Applicant: Google LLC

Inventor： Aurelien Jean Francois David ,  Benjamin Wales ,  Bergen Albert Fletcher ,  Daniel Adema ,  Daniel J. Effinger ,  Vance R. Morrison ,  Patrick F. Brinkley ,  Ian Andrews ,  Stuart James Myron Nicholson ,  Shreyas Potnis

IPC: G02B27/10 ,  G02B26/08 ,  G02B27/01 ,  G02B27/12

Abstract: A display system includes one or more low-power laser diodes, each producing an emission. The emissions are directed to an optical element that affects the direction or divergence of the emissions. The optical element redirects the emissions toward a steering element such as a MEMS-actuated mirror, or a combination of such mirrors. The steering element directs the emissions toward the incoupler of a waveguide acting as an optical combiner. The emissions propagate through the waveguide and are extracted by an outcoupler in the direction of an observer. By scanning the direction of the beam-steering element along one or several directions, an image may be formed.

公开(公告)号：US12147056B2

公开(公告)日：2024-11-19

申请号：US17399566

申请日：2021-08-11

Applicant: GOOGLE LLC

Inventor： Daniel Adema ,  Vance R. Morrison

IPC: G02B27/10 ,  G02B26/10 ,  G02B27/12

Abstract: A laser projection system is provided that includes at least one pickoff element or pickoff interface that redirects a portion of input laser light toward one or more photodetectors for purposes such as laser output power monitoring. An interface of a given pickoff element or a given pickoff interface uses Fresnel reflection to redirect the input laser light. The Fresnel reflection occurs due to a difference in indices of refraction between two materials that meet to form that interface. In some embodiments, a pickoff element is disposed in an optical path between a beam combiner and an optical scanner of the system. The pickoff element can be a plate beamsplitter, a cube beamsplitter, or a prism. In some embodiments, at least one pickoff interface is provided between two or more substrates of the beam combiner, the substrates that form a given pickoff interface having different respective indices of refraction.

公开(公告)号：US20230047415A1

公开(公告)日：2023-02-16

申请号：US17399566

申请日：2021-08-11

Applicant: GOOGLE LLC

Inventor： Daniel Adema ,  Vance R. Morrison

IPC: G02B27/10 ,  G02B26/10 ,  G02B27/12

Abstract: A laser projection system is provided that includes at least one pickoff element or pickoff interface that redirects a portion of input laser light toward one or more photodetectors for purposes such as laser output power monitoring. An interface of a given pickoff element or a given pickoff interface uses Fresnel reflection to redirect the input laser light. The Fresnel reflection occurs due to a difference in indices of refraction between two materials that meet to form that interface. In some embodiments, a pickoff element is disposed in an optical path between a beam combiner and an optical scanner of the system. The pickoff element can be a plate beamsplitter, a cube beamsplitter, or a prism. In some embodiments, at least one pickoff interface is provided between two or more substrates of the beam combiner, the substrates that form a given pickoff interface having different respective indices of refraction.