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

Claim 16:
17. A lighting method, comprising the steps of:
preparing a lighting device including 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, and a second optical system that regulates an optical path of the coherent light from the first optical member; and
illuminating a lighting zone on a plane of projection with the coherent light from the second optical system,
wherein
in the illuminating step, by changing an optical path of the coherent light using the scanner, a direction of emission of the coherent light from the second optical member is changed and a position of incidence of the coherent light is caused to move over the plane of projection,
the lighting device further includes a second optical member that causes the coherent light from the second optical system to diffuse and spreads the coherent light onto the lighting zone having a predetermined pattern on the plane of projection, and
in the illuminating step, by changing an optical path of the coherent light using the scanner, the predetermined pattern visually identified is caused to move over the plane of projection.