US 12,259,535 B2
Optical unit and image display device
Takashi Takeda, Suwa (JP); Masayuki Takagi, Azumino (JP); and Kunihiko Yano, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 24, 2022, as Appl. No. 17/680,237.
Claims priority of application No. 2021-029756 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0276476 A1, Sep. 1, 2022
Int. Cl. G02B 17/00 (2006.01); G02B 13/18 (2006.01); G02B 17/08 (2006.01); G02B 27/01 (2006.01); G09G 3/00 (2006.01)
CPC G02B 17/08 (2013.01) [G02B 13/18 (2013.01); G02B 27/0172 (2013.01); G09G 3/002 (2013.01); G02B 2027/011 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical unit comprising:
a display element configured to emit imaging light,
a first mirror on which the imaging light is incident at a first angle from the display element, and configured to reflect a portion of the imaging light, and
a second mirror configured to return the imaging light, reflected by the first mirror, toward the first mirror to form an exit pupil, and to cause the imaging light to be incident on the first mirror at a second angle that is smaller than the first angle, wherein
the first mirror includes an angle dependent separation film that shows different separation characteristics for the first angle and the second angle, wherein
the display element includes a display surface distorted according to aberration generated by at least one of the first mirror or the second mirror.