公开(公告)号：US20190265486A1

公开(公告)日：2019-08-29

申请号：US16277875

申请日：2019-02-15

Applicant: Apple Inc.

Inventor： Eric J. Hansotte ,  Byron R. Cocilovo ,  Se Baek Oh ,  Seyedeh Mahsa Kamali ,  Francesco Aieta

IPC: G02B27/01 ,  G02B26/10 ,  F21V8/00

Abstract: An electronic device may have a light source such as a laser light source. The light source may emit light into a waveguide. A phase grating may diffract the light that is emitted into the waveguide to produce diffracted light. The diffracted light may be oriented parallel to a surface normal of an angled edge of the waveguide and parallel to a surface normal of a microelectromechanical systems mirror element in a two-dimensional scanning microelectromechanical systems mirror that is coupled to the edge of the waveguide. A wave plate may be interposed between the mirror and the edge of the waveguide to change the polarization state of light reflected from the mirror element relative to incoming diffracted light from the phase grating. The phase grating may be configured so that the reflected light is not diffracted by the phase grating.