US 12,287,482 B2
Virtual image display apparatus
Toshiaki Miyao, Chino (JP); Toshiyuki Noguchi, Shiojiri (JP); and Kunihiko Yano, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 30, 2022, as Appl. No. 17/708,249.
Claims priority of application No. 2021-059381 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0326525 A1, Oct. 13, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 5/02 (2006.01); G02B 5/08 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/0289 (2013.01); G02B 5/0816 (2013.01); G02B 2027/0178 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A virtual image display apparatus comprising:
an image light emitting unit that emits an image light; and
an optical member having a reflective film which reflects the image light, the reflective film including a first region on which a light ray of the image light corresponding to a center angle of view is incident and a second region in which a light ray of the image different from the light ray corresponding to the center angle of view is incident, wherein:
a film thickness in the first region of the reflective film is thicker than a film thickness in the second region,
the first region of the reflective film has reflectivity characteristics corresponding to a wavelength band which is wider toward a long wavelength side than a wavelength band of the image light,
the film thickness in the first region of the reflective film and the film thickness in the second region of the reflective film are expressed by the following equation:
d′=d cos θ, wherein
the film thickness in the first region of the reflective film is d, the film thickness in the second region of the reflective film is d′, and an inclination angle of the second region with respect to the first region is θ.