US 11,892,764 B2
Projection system and projector
Hirotaka Yanagisawa, Azumino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jan. 22, 2021, as Appl. No. 17/156,280.
Claims priority of application No. 2020-008952 (JP), filed on Jan. 23, 2020.
Prior Publication US 2021/0232037 A1, Jul. 29, 2021
Int. Cl. G03B 21/28 (2006.01); G02B 5/10 (2006.01); G02B 13/18 (2006.01); G02B 13/16 (2006.01); G02B 17/08 (2006.01)
CPC G03B 21/28 (2013.01) [G02B 5/10 (2013.01); G02B 13/16 (2013.01); G02B 13/18 (2013.01); G02B 17/08 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A projection system, in which light travels from a reduction side to an enlargement side along a light traveling direction, comprising:
a first optical system; and
a second optical system including an optical element and a reflector and disposed at the enlargement side of the first optical system,
wherein the optical element has a reflection surface, a first transmissive surface disposed at the enlargement side of the reflection surface, and a second transmissive surface disposed at the enlargement side of the first transmissive surface,
the reflector is disposed at the enlargement side of the reflection surface and at the reduction side of the first transmissive surface,
the reflector is disposed between the optical element and the first optical system in a direction along a first optical axis of the first optical system, and
the reflector is a flat mirror that is perpendicular to a second optical axis of the reflection surface.