US 12,228,849 B2
Optical device, projector, and imaging apparatus
Eiji Morikuni, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Sep. 15, 2021, as Appl. No. 17/475,484.
Claims priority of application No. 2020-154422 (JP), filed on Sep. 15, 2020.
Prior Publication US 2022/0082783 A1, Mar. 17, 2022
Int. Cl. G03B 21/28 (2006.01); G02B 13/16 (2006.01); G02B 17/08 (2006.01); G03B 17/17 (2021.01); G03B 21/14 (2006.01)
CPC G03B 21/28 (2013.01) [G02B 13/16 (2013.01); G02B 17/08 (2013.01); G03B 17/17 (2013.01); G03B 21/142 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical device comprising:
a first optical system having an optical reflecting lens;
a second optical system having a lens and disposed at a reduction side of the first optical system;
a first holding member holding the optical reflecting lens;
a first movement mechanism configured to move the first holding member in optical axis directions along an optical axis of the reflecting lens;
a second holding member holding the second optical system lens; and
a second movement mechanism configured to move the second holding member along the optical axis directions, wherein
the optical reflecting lens has a reflection surface,
the first movement mechanism has a fixing member supporting the first holding member rotatably around a rotation axis and a transport portion configured to move the first holding member along the optical axis directions according to rotation of the first holding member,
the reflection surface has a shape rotationally symmetrical with respect to the rotation axis, and
the rotation axis and the optical axis are the same axis.