Patent ID: 11940139
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  G | IPC F  G

Claim 12:
13. The lighting device according to claim 1, wherein
a distribution of irradiance along a certain direction within a region where the coherent light passes over a plane orthogonal to an optical axis of the coherent light traveling from the lighting device toward the lighting zone does not include a local minimum value of irradiance within a range between two half-value positions, located on both sides of a maximum position at which a maximum irradiance is obtained, at each of which an irradiance half as high as the maximum irradiance is obtained, or
a local minimum value of irradiance exists within the range and a proportion of a difference between a smaller local maximum value of local maximum values of irradiance obtained at two local maximum-value positions located on both sides of a local minimum-value position at which the local minimum value is obtained and the local minimum value to the smaller local maximum value is lower than or equal to 20 [%].