公开(公告)号：US20180188507A1

公开(公告)日：2018-07-05

申请号：US15906365

申请日：2018-02-27

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Tsuneo UCHIDA ,  Katsu YAMADA

IPC: G02B13/16 ,  G03B21/28

CPC classification number: G03B21/28 ,  G02B13/16 ,  G02B13/18 ,  G02B17/08 ,  G03B21/00 ,  G03B21/14 ,  H04N5/74

Abstract: A projection optical system is an optical system for projecting an image light flux formed in an image display element onto a projection surface, and includes a transmission optical system and a reflection optical system. The transmission optical system is located on an emission surface side of the image display element and includes a stop and a plurality of lenses. The reflection optical system includes a positive-power first mirror and a second mirror. Conditional Expression (1) is satisfied 0