公开(公告)号：US20180252850A1

公开(公告)日：2018-09-06

申请号：US15753909

申请日：2016-08-22

Applicant: HOYA LENS THAILAND LTD.

Inventor： Hiroshi AOKI

IPC: G02B5/18 ,  G02B27/02 ,  G02B6/34 ,  G02B27/01

CPC classification number: G02B5/1814 ,  G02B5/18 ,  G02B5/1861 ,  G02B6/34 ,  G02B27/0172 ,  G02B27/02 ,  G02B2005/1804

Abstract: Provided is an optical device which increases design flexibility. An optical device includes: a light guiding unit, the cross-section of which is approximately trapezoidal; and diffraction gratings disposed in the light guiding unit. The diffraction gratings are obliquely disposed with respect to the longitudinal direction of the light guiding unit. A signal that is output from a micro-projector (light source) enters the diffraction grating, light that is diffracted by the diffraction grating is reflected by a reflecting unit, the reflected light is diffracted by the diffraction grating and enters an eye.