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

Claim 17:
18. 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
the scanner causes the coherent light to move so that a plurality of the predetermined patterns are visually identified on the plane of projection.