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US 11,447,065 B2Granted
Timing control unit for controlling an illumination device with coherent light source
AssigneeDai Nippon Printing Co., Ltd.
InventorsMakio Kurashige, Tomoe Sato, Kazutoshi Ishida
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Abstract
An illumination device has a coherent light source that emits coherent light beam, and an optical device that diffuses the coherent light beam, wherein the optical device comprises a first diffusion region that diffuses the coherent light beam to illuminate a first area, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area.
Claims20
An illumination device comprising:
- a coherent light source that emits coherent light beam;
- an optical device that diffuses the coherent light beam;
- and
- a scanning unit that scans the coherent light beam emitted by the coherent light source on the optical device,
- wherein the optical device comprises a first diffusion region that diffuses the coherent light beam scanned on the optical device by the scanning unit to illuminate a first area provided on a ground level, and a second diffusion region that diffuses the coherent light beam scanned on the optical device by the scanning unit to display predetermined information in a second area provided on the ground level,
- wherein the predetermined information is a guidance information, and
- wherein a coherent light beam emitted from the second diffusion region has a shape of the guidance information, and
- wherein the second diffusion region displays the guidance information by projecting the coherent light beam having the shape of the guidance information onto the second area on the ground level.
5 more elements
An illumination device comprising:
- a coherent light source that emits coherent light beam;
- an optical device comprising a first diffusion region that diffuses the coherent light beam to illuminate a first area provided on a ground level, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area provided on the ground level;
- and
- a timing control unit that controls a light emission timing at which the coherent light source emits the coherent light so that the coherent light illuminates the first diffusion region and the second diffusion region, an incident timing at which the coherent light from the coherent light source is incident on the first diffusion region and the second diffusion region, or an illumination timing at which the coherent light diffused by the optical device illuminates the first area and the second area,
- wherein the predetermined information is a guidance information,
- wherein a coherent light beam emitted from the second diffusion region has a shape of the guidance information, and
- wherein the second diffusion region displays the guidance information by projecting the coherent light beam having the shape of the guidance information onto the second area on the ground.
4 more elements
Dependencies are inferred from the claim text.