US 12,449,658 B2
Image display device
Yoichi Ogata, Shizuoka (JP)
Assigned to KOITO MANUFACTURING CO., LTD., Tokyo (JP)
Appl. No. 17/912,922
Filed by KOITO MANUFACTURING CO., LTD., Tokyo (JP)
PCT Filed Mar. 19, 2021, PCT No. PCT/JP2021/011537
§ 371(c)(1), (2) Date Sep. 20, 2022,
PCT Pub. No. WO2021/193475, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-059211 (JP), filed on Mar. 27, 2020.
Prior Publication US 2023/0213763 A1, Jul. 6, 2023
Int. Cl. G02B 27/01 (2006.01); B60K 35/22 (2024.01); B60K 35/23 (2024.01); B60K 35/60 (2024.01); G02B 27/14 (2006.01)
CPC G02B 27/0172 (2013.01) [B60K 35/22 (2024.01); B60K 35/23 (2024.01); B60K 35/60 (2024.01); G02B 2027/0178 (2013.01); G02B 27/141 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An image display device comprising:
a first image projector configured to project a first image;
a beam splitter configured to reflect a part of light emitted from the first image projector in a first direction and transmit remaining light in a second direction;
a retroreflector configured to retroreflect, to the beam splitter, light traveling from the beam splitter in one of the first direction and the second direction;
a reflector configured to reflect, to the beam splitter, light traveling from the beam splitter in the other of the first direction and the second direction;
an image forming optical unit comprising a dichroic mirror configured to form an image of the light reflected by the retroreflector and the reflector in a space; and
a second image projector configured to project a second image,
wherein the beam splitter is configured to reflect a part of light emitted from the second image projector in the first direction and transmit remaining light in the second direction,
wherein the light emitted by the first image projector has a first wavelength,
wherein the light emitted by the second image projector has a second wavelength different from the first wavelength, and
wherein the image display device further comprises:
a first filter disposed at one of a position between the beam splitter and the retroreflector and a position between the beam splitter and the reflector, configured to cut the first wavelength, and configured to transmit the second wavelength; and
a second filter disposed at the other of the position between the beam splitter and the retroreflector and the position between the beam splitter and the reflector, configured to cut the second wavelength, and configured to transmit the first wavelength.