US 12,455,437 B2
Optical system and projector
Eiji Morikuni, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Dec. 7, 2022, as Appl. No. 18/076,596.
Claims priority of application No. 2021-199084 (JP), filed on Dec. 8, 2021.
Prior Publication US 2023/0176343 A1, Jun. 8, 2023
Int. Cl. G02B 13/16 (2006.01); G02B 17/08 (2006.01)
CPC G02B 13/16 (2013.01) [G02B 17/0832 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An optical system configured to project a projection image formed on a reduction-side conjugated plane on an enlargement-side conjugated plane as an enlarged image, the optical system comprising:
a first optical system having a first optical element; and
a second optical system arranged at a reduction side of the first optical system, wherein
an intermediate image conjugated with the reduction-side conjugated plane and the enlargement-side conjugated plane is formed between the first optical system and the second optical system,
the first optical element has a first reflecting surface having a concave shape,
the second optical system has a first relay element, a second relay element arranged at an enlargement side of the first relay element, and a correction optical element arranged at the enlargement side of the second relay element,
the first relay element has a first relay reflecting surface having a concave shape,
the second relay element has a second relay reflecting surface having a convex shape, and
the correction optical element curves the intermediate image generated by the first relay element and the second relay element to reduce a field curvature generated by the first optical element.