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Light emitting device, vehicle headlamp, illumination device, and laser element

  • US 9,816,677 B2
  • Filed: 09/21/2011
  • Issued: 11/14/2017
  • Est. Priority Date: 10/29/2010
  • Status: Active Grant
First Claim
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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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