US 11,835,202 B2
Illumination device
Ritsuya Oshima, Tokyo (JP); Masatoshi Nishimura, Tokyo (JP); Akihiro Yamada, Tokyo (JP); and Muneharu Kuwata, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/773,046
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 21, 2019, PCT No. PCT/JP2019/045523
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/100161, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0397254 A1, Dec. 15, 2022
Int. Cl. F21V 14/06 (2006.01); F21V 5/04 (2006.01); F21V 11/08 (2006.01); F21Y 115/10 (2016.01)
CPC F21V 14/06 (2013.01) [F21V 5/04 (2013.01); F21V 11/08 (2013.01); F21Y 2115/10 (2016.08)] 19 Claims
OG exemplary drawing
 
1. An illumination device comprising:
a light source unit to emit light;
a first optical unit to let the light enter and to change a divergence angle of the entered light;
a second optical unit including an image light formation region, the second optical unit letting the light with the changed divergence angle enter and emitting light including image light configured to form an image on an illuminated surface; and
a drive unit configured to move the first optical unit and the second optical unit, and the drive unit is further configured to execute a first operation of translating that translates the first optical unit in a direction of an optical axis of the first optical unit.