Light emitting device, vehicle headlamp, illumination device, and laser element
First Claim
Patent Images
1. A light emitting device comprising:
- a laser beam source;
a light emitting section for generating fluorescence by receiving a laser beam from the laser beam source;
an opaque heat conductive member supporting the light emitting section; and
a light irradiation section for irradiating a light irradiated surface of the light emitting section with the laser beam which increases regularly in beam diameter in a direction in which the laser beam travels,the heat conductive member having a surface that is in contact with a bottom surface of the light emitting section, the bottom surface being opposite from the irradiated surface, and the bottom surface and the irradiated surface being parallel to each other,wherein the light irradiation section includes an increasing rate changing element through which the laser beam emitted from the laser beam source travels, and the increasing rate changing element reduces an increasing rate of a beam diameter of the laser beam in the direction in which the laser beam travels, as the laser beam travels through the increasing rate changing element,the increasing rate changing element is a lens, and no optical member that changes the increasing rate of the laser beam is provided between the increasing rate changing element and the light emitting section, the lens consisting of a single piece of optical component, andthe laser beam source and the lens are configured so that the lens expands the diameter of the laser beam exiting from the lens toward the light emitting section.
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Abstract
A light emitting device of the present invention includes a light-emitting section for generating fluorescence by receiving a laser beam, and a light irradiation unit for irradiating a light irradiated surface of the light emitting section with a laser beam that increases regularly in beam diameter in a direction in which the laser beam travels.
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Citations
10 Claims
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1. A light emitting device comprising:
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a laser beam source; a light emitting section for generating fluorescence by receiving a laser beam from the laser beam source; an opaque heat conductive member supporting the light emitting section; and a light irradiation section for irradiating a light irradiated surface of the light emitting section with the laser beam which increases regularly in beam diameter in a direction in which the laser beam travels, the heat conductive member having a surface that is in contact with a bottom surface of the light emitting section, the bottom surface being opposite from the irradiated surface, and the bottom surface and the irradiated surface being parallel to each other, wherein the light irradiation section includes an increasing rate changing element through which the laser beam emitted from the laser beam source travels, and the increasing rate changing element reduces an increasing rate of a beam diameter of the laser beam in the direction in which the laser beam travels, as the laser beam travels through the increasing rate changing element, the increasing rate changing element is a lens, and no optical member that changes the increasing rate of the laser beam is provided between the increasing rate changing element and the light emitting section, the lens consisting of a single piece of optical component, and the laser beam source and the lens are configured so that the lens expands the diameter of the laser beam exiting from the lens toward the light emitting section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light emitting device comprising:
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a laser beam source emitting a laser beam having a beam diameter expanding as the laser beam travels away from the laser beam source; a light emitting section having an irradiation surface and a bottom surface opposite from the irradiation surface and generating fluorescence by receiving the laser beam at the irradiation surface, the bottom surface and the irradiated surface being parallel to each other; a lens receiving the laser beam from the laser beam source and projecting the laser beam directly to the light emitting section, the projected laser beam having a beam diameter expanding as the laser beam travels away from the lens toward the light emitting section, the lens reducing a rate of expansion of the beam diameter when the laser beam passes through the lens, the lens consisting of a single piece of optical component; and an opaque heat conductive member supporting the light emitting section, the heat conductive member having a surface that is in contact with the bottom surface of the light emitting section.
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Specification