US 12,147,040 B2
Virtual image display device and optical unit
Daiki Matsumoto, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 29, 2021, as Appl. No. 17/389,056.
Claims priority of application No. 2020-129071 (JP), filed on Jul. 30, 2020.
Prior Publication US 2022/0035164 A1, Feb. 3, 2022
Int. Cl. G02B 27/01 (2006.01); G02B 26/08 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 26/0816 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0178 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A virtual image display device comprising:
an image light generation device generating image light;
a first mirror reflecting the image light from the image light generation device; and
a second mirror having a concave shape and reflecting, toward the first mirror, the image light reflected by the first mirror,
wherein the second mirror includes a transmissive member, a reflection film, and a light shielding film,
the transmissive member includes a first surface and a second surface opposing to the first surface,
the reflection film, on which the image light reflected by the first mirror is incident, is provided along the first surface of the transmissive member,
the light shielding film shields a part of the image light, the light shielding pattern film is provided along the second surface of the transmissive member,
the light shielding film includes a light reduction region reducing the image light and a transmissive region transmitting the image light, and
the light reduction region includes a first pattern element and a second pattern element in two-dimensionally arranged, a distance from the first pattern element to the second pattern element is 100 μm or greater.