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1. (WO2018179561) PROJECTION OPTICAL SYSTEM, IMAGE PROJECTION DEVICE AND IMAGE PROJECTION SYSTEM

Pub. No.:    WO/2018/179561    International Application No.:    PCT/JP2017/039848
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Tue Nov 07 00:59:59 CET 2017
IPC: G02B 17/08
G02B 13/18
G03B 21/14
Applicants: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
パナソニックIPマネジメント株式会社
Inventors: UCHIDA Tsuneo
内田 恒夫
YAMADA Katsu
山田 克
Title: PROJECTION OPTICAL SYSTEM, IMAGE PROJECTION DEVICE AND IMAGE PROJECTION SYSTEM
Abstract:
This projection optical system (100) for enlarging and projecting an image of an image display element (130) on a surface to be projected on (SC), is provided with a transmission optical system (110) and a reflection optical system (120). The transmission optical system (110) includes a plurality of lenses and an aperture diaphragm. The reflection optical system (120) includes: a first reflection surface which reflects emission light from the transmission optical system (110); and a second reflection surface which reflects emission light from the first reflection surface. The surface to be projected on (SC) is not parallel to the display surface of the image display element (130). The main beam of a reference beam (R) is a beam which passes through the center of the aperture diaphragm among beams projected to the nearest side of the projection optical system (100) on the surface to projected (SC). Local power on the first reflection surface at a location at which the main beam of the reference beam (R) is incident to the first reflection surface is stronger than local power on the second reflection surface at a location at which the main beam of the reference beam (R) is incident to the second reflection surface.