US 11,940,139 B2
Lighting device and lighting method
Shumpei Nishio, Tokyo (JP); Toshiyuki Nakai, Tokyo (JP); and Makio Kurashige, Tokyo (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Appl. No. 17/622,888
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
PCT Filed Jun. 29, 2020, PCT No. PCT/JP2020/025552
§ 371(c)(1), (2) Date Dec. 27, 2021,
PCT Pub. No. WO2020/262698, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-121715 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0228720 A1, Jul. 21, 2022
Int. Cl. F21V 3/00 (2015.01); F21V 5/00 (2018.01); G02B 26/10 (2006.01); F21Y 113/10 (2016.01); F21Y 115/30 (2016.01)
CPC F21V 3/00 (2013.01) [F21V 5/008 (2013.01); G02B 26/101 (2013.01); F21Y 2113/10 (2016.08); F21Y 2115/30 (2016.08)] 18 Claims
OG exemplary drawing
 
1. A lighting device comprising:
a light source that emits coherent light;
a scanner that causes the coherent light emitted from the light source to move;
a first optical system that regulates an optical path of the coherent light from the scanner;
a first optical member that causes the coherent light from the first optical system to diffuse;
a second optical system that regulates an optical path of the coherent light from the first optical member; and
a second optical member that directs the coherent light from the second optical system toward a lighting zone on a plane of projection,
wherein
the lighting zone on the plane of projection is illuminated with the coherent light from the second optical member, and
an irradiance [W/m2] in a plane orthogonal to an optical axis of the coherent light irradiated on the lighting zone is non-discrete.