US 12,072,513 B2
Lighting device and optical member
Ryosuke Shigitani, Osaka (JP); and Shumpei Fujii, Osaka (JP)
Assigned to Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Appl. No. 17/426,160
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jan. 17, 2020, PCT No. PCT/JP2020/001448
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/162139, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-019103 (JP), filed on Feb. 5, 2019.
Prior Publication US 2022/0099867 A1, Mar. 31, 2022
Int. Cl. G02B 5/02 (2006.01); F21S 2/00 (2016.01); F21V 7/28 (2018.01)
CPC G02B 5/0252 (2013.01) [F21S 2/005 (2013.01); F21V 7/28 (2018.02)] 8 Claims
OG exemplary drawing
 
1. A lighting device which outputs output light, the lighting device comprising:
a light source; and
an optical member which includes at least one of reflection wavelength selectivity or transmission wavelength selectivity depending on an incidence angle of incident light from the light source, wherein
the incident light is incident on the optical member at a plurality of different incidence angles,
the incident light is converted into outgoing light through the optical member,
the outgoing light includes reflected light reflected by the optical member and transmitted light transmitted through the optical member,
the output light is light based on only the reflected light out of the reflected light and the transmitted light that are included in the outgoing light, and
chromaticity of the output light continuously changes on a surface irradiated by the output light.