Light-emitting device and vehicle headlight

A light-emitting device, comprising:

• a plurality of laser beam sources each for emitting a laser beam;
• a fluorescent unit for emitting light in response to the laser beam emitted from at least one of the plurality of laser beam sources;
• an emission controller for controlling whether each of the plurality of laser beam sources emits light or not, at least a part of the plurality of laser beam sources being positioned in such a manner that irradiation regions of the fluorescent unit which are respectively irradiated with the laser beams emitted from the plurality of laser beam sources are positioned at least partially differently;
• at least one optical element for controlling guide of the laser beams emitted from the plurality of laser beam sources toward the fluorescent unit, the plurality of laser beam sources and said at least one optical element being included in a single housing,
• a seat which is thermally conductive;
• and
• a heat radiator for radiating heat generated in the plurality of laser beam sources,
• the seat having a first plane to which the plurality of laser beam sources are attached and a second plane to which the heat radiator is attached, the first plane being substantially parallel to the second plane.

A light-emitting device, comprising:

• a plurality of laser beam sources each for emitting a laser beam;
• a fluorescent unit for emitting light in response to the laser beam emitted from at least one of the plurality of laser beam sources;
• an emission controller for controlling whether each of the plurality of laser beam sources emits light or not, at least a part of the plurality of laser beam sources being positioned in such a manner that irradiation regions of the fluorescent unit which are respectively irradiated with the laser beams emitted from the plurality of laser beam sources are positioned at least partially differently;
• and
• at least one optical element for controlling guide of the laser beams emitted from the plurality of laser beam sources toward the fluorescent unit,
• wherein said at least one optical element is at least one light guide including an incident end section for receiving the laser beams emitted from the plurality of laser beam sources and an emission end section for emitting the laser beams to the fluorescent unit, and
• said at least one light guide includes a plurality of light guides, and
• the plurality of light guide guides each include a core having a polygonal cross section taken in a direction perpendicular to a direction in which the laser beams are guided.

A light-emitting device, comprising:

• a plurality of laser beam sources each for emitting a laser beam;
• a fluorescent unit for emitting light in response to the laser beam emitted from at least one of the plurality of laser beam sources;
• an emission controller for controlling whether each of the plurality of laser beam sources emits light or not, at least a part of the plurality of laser beam sources being positioned in such a manner that irradiation regions of the fluorescent unit which are respectively irradiated with the laser beams emitted from the plurality of laser beam sources are positioned at least partially differently;
• and
• a computing unit for detecting an object in a light-castable range which is a range in which the light-emitting device is capable of casting light, the emission controller controlling whether each of the plurality of laser beam sources emits light or not in accordance with a result of detection by the computing unit,
• wherein the computing unit identifies the kind of the object detected by the computing unit, and
• the emission controller controls whether each of the plurality of laser beam sources emits light or not in accordance with the kind of the object identified by the computing unit.