US 11,982,927 B2
Light irradiation device having two wedge prisms and an aberration correction surface
Masashige Suwa, Tokyo (JP); Ritsuya Oshima, Tokyo (JP); Muneharu Kuwata, Tokyo (JP); and Kuniko Kojima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/054,178
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jun. 4, 2018, PCT No. PCT/JP2018/021373
§ 371(c)(1), (2) Date Nov. 10, 2020,
PCT Pub. No. WO2019/234795, PCT Pub. Date Dec. 12, 2019.
Prior Publication US 2021/0190295 A1, Jun. 24, 2021
Int. Cl. G03B 21/13 (2006.01); G02B 26/08 (2006.01); G02B 27/00 (2006.01); G02B 27/18 (2006.01); G03B 21/14 (2006.01)
CPC G03B 21/13 (2013.01) [G02B 26/0891 (2013.01); G02B 27/0025 (2013.01); G02B 27/0068 (2013.01); G02B 27/18 (2013.01); G03B 21/142 (2013.01); G03B 2205/003 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A light irradiation device comprising:
a light source to emit light;
a projection optical system to project an image formed based on the light emitted from the light source;
an aberration correction surface to correct an aberration occurring when the image is projected by the projection optical system;
a first wedge prism to receive and deflect the light emitted from the projection optical system; and
a second wedge prism to receive and deflect the light deflected by the first wedge prism,
wherein the first wedge prism and the second wedge prism are held so that a deflection direction of light emitted from the second wedge prism is changeable by rotation of at least one of the first wedge prism and the second wedge prism, and
wherein the aberration correction surface is at an incident surface of the first wedge prism.