Projection optical system and image display apparatus including a refraction optical system and first and second reflecing surfaces

Invention Grant

US09766438B2 Projection optical system and image display apparatus including a refraction optical system and first and second reflecing surfaces 有权

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Patent Title: Projection optical system and image display apparatus including a refraction optical system and first and second reflecing surfaces
Application No.: US14971671

Application Date: 2015-12-16
Publication No.: US09766438B2

Publication Date: 2017-09-19
Inventor: Yohei Takano , Hibiki Tatsuno , Nobuyuki Arai , Hirotoshi Nakayama
Applicant: Ricoh Company, Ltd.
Applicant Address: JP Tokyo
Assignee: Ricoh Company, Ltd.
Current Assignee: Ricoh Company, Ltd.
Current Assignee Address: JP Tokyo
Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
Priority: JP2013-105851 20130520
Main IPC: G02B17/08
IPC: G02B17/08 ; G03B21/28 ; G02B13/16 ; G02B3/04 ; G02B5/10 ; G03B21/14

$Projection optical system and image display apparatus including a refraction optical system and first and second reflecing surfaces$

Abstract:

There is provided a projection optical system capable of projecting an image formed on an image forming unit on a projection plane, which has an extremely short projection distance and a small size.

Public/Granted literature

US20160103304A1 PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS Public/Granted day:2016-04-14

Information query

Espacenet

IPC分类:

G	物理
G02	光学
G02B	光学元件、系统或仪器
G02B17/00	有或无折射元件的具有反射面的系统
G02B17/08	.折反射系统