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Lighting apparatus with lens having safety light-dispersing structures

  • US 10,151,431 B2
  • Filed: 10/17/2016
  • Issued: 12/11/2018
  • Est. Priority Date: 10/20/2015
  • Status: Active Grant
First Claim
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1. A lighting apparatus which radiates visible light, with laser light as a light source, the laser light having a wavelength shorter than a wavelength of the visible light, the lighting apparatus comprising:

  • a light-emitter which, when irradiated with the laser light, radiates the visible light having the wavelength different from the wavelength of the laser light; and

    a lens integrally including a light distribution controlling structure, the light distribution controlling structure including first structures that control distribution of the visible light radiated from the light-emitter, the lens being disposed opposite a laser light entry side of the lighting apparatus, the light-emitter being disposed between the lens and the laser light entry side,wherein the lens integrally includes, in a region through which an optical axis of the laser light passes, a light-dispersing structure including third structures having at least one of a convex shape and a concave shape, the third structures configured to disperse the laser light having the wavelength shorter than the wavelength of the visible light, anda distance between adjacent third structures among the third structures of the light-dispersing structure is at most equal to 1/100th of a distance between adjacent first structures among the first structures of the light distribution controlling structure, and is at least 1 micron and at most 100 microns on average.

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