公开(公告)号：US20220317259A1

公开(公告)日：2022-10-06

申请号：US17806507

申请日：2022-06-13

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kenji Narumi ,  Akira Hashiya ,  Tokuzou Kiyohara

IPC: G01S7/481 ,  F21V7/00 ,  G01S17/931

Abstract: A light projection apparatus includes a first mirror and a second mirror facing each other and extending in a first direction and an optical waveguide layer being located between the first mirror and the second mirror, having a structure in which a refractive index and/or a thickness can be changed, and guiding light in the first direction. The first mirror has light transmissivity higher than that of the second mirror, at least part of the light propagating in the optical waveguide layer is emitted outside therefrom, and an emission angle of light to be emitted from the first mirror can be changed in a range from an angle θ1 to an angle θ2 (>θ1) by the refractive index and/or the thickness of the optical waveguide layer being changed. First light emitted at the angle θ1 is projected vertically downward relative to second light emitted at the angle θ2.