US 12,332,441 B2
Display device and optical unit
Takashi Takeda, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Oct. 28, 2021, as Appl. No. 17/512,698.
Claims priority of application No. 2020-181266 (JP), filed on Oct. 29, 2020.
Prior Publication US 2022/0137414 A1, May 5, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 27/09 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0972 (2013.01); G02B 27/0977 (2013.01); G02B 2027/0178 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A display device comprising:
an image element that emits an imaging light;
a projection lens that transmits the imaging light;
a prism mirror that has a light incident surface on which the imaging light emitted from the projection lens is incident, an inner reflection surface that reflects the imaging light from the light incident surface, and a light emission surface that emits the imaging light from the inner reflection surface;
a see-through mirror that reflects the imaging light emitted from the light emission surface of the prism mirror toward a pupil position;
a first diaphragm that limits passage of the imaging light and that is arranged at a position between the projection lens and the light incident surface of the prism mirror or a position between the light emission surface of the prism mirror and the see-through mirror,
wherein the first diaphragm is a part of a holding member that supports the prism mirror, and the first diaphragm is arranged between the projection lens and the prism mirror; and
a second diaphragm that is arranged between the light emission surface of the prism mirror and the see-through mirror.