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Patexia Research
Patent No. US 11306878
Issue Date Apr 19, 2022
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Patent 11306878 - Smart-home device light rings with scalloped transmissive sections for uniform output > Claims

  • 1. A light guide for a smart-home device, the light guide having a substantially cylindrical shape and comprising: a transparent middle layer comprising a plurality of cutouts configured to receive a plurality of light-emitting diodes (LEDs); a plurality of transmissive sections that extend away from the plurality of cutouts, wherein the plurality of transmissive sections have scalloped profiles that radiate outward from the plurality of cutouts, such that light from the LEDs is gradually reflected as it travels through the middle layer towards a substantially circular output surface of middle layer; and the substantially circular output surface that receives the light received through the plurality of cutouts through the plurality of transmissive sections.
    • 2. The light guide of claim 1, wherein the light guide comprises a cylindrical shape with a bottom substantially circular surface and a top substantially circular surface.
      • 3. The light guide of claim 2, wherein the plurality of cutouts are evenly spaced around the bottom substantially circular surface of the cylindrical shape.
        • 4. The light guide of claim 3, wherein the plurality of cutouts extend into the bottom substantially circular surface of the cylindrical shape.
      • 5. The light guide of claim 2, wherein the substantially circular output surface comprises the top substantially circular surface of the cylindrical shape.
    • 6. The light guide of claim 1, wherein the plurality of transmissive sections comprise thicknesses that taper as the plurality of transmissive sections extend away from the plurality of cutouts.
    • 7. The light guide of claim 1, wherein a thinnest portion of the plurality of transmissive sections is located directly above the plurality of cutouts adjacent to the substantially circular output surface.
    • 8. The light guide of claim 1, wherein a thickest portion of the plurality of transmissive sections is located directly above the plurality of cutouts adjacent to the plurality of cutouts.
    • 9. The light guide of claim 1, wherein a tapering of the plurality of transmissive sections decreases as the plurality of transmissive sections radiate outward from lines extending from directly above the plurality of cutouts.
    • 10. The light guide of claim 1, wherein the scalloped profiles of the plurality of transmissive sections gradually reflect light as it travels upwards through the light guide to uniformly distribute the light out of the substantially circular output surface.
  • 11. A method of assembling a uniform light ring in a smart-home device, the method comprising: mounting a plurality of LEDs (light emitting diodes) on a printed circuit board; placing a light guide having a cylindrical shape on top of the printed circuit board, wherein the plurality of LEDs are received by a plurality of cutouts in a transparent middle layer of the light guide of the light ring, and wherein the transparent middle layer of the light guide comprises a plurality of transmissive sections that extend away from the plurality of cutouts, wherein the plurality of transmissive sections have scalloped profiles that radiate outward from the plurality of cutouts, such that light from the LEDs is gradually reflected as it travels through the middle layer towards a substantially circular output surface of middle layer.
    • 12. The method of claim 11, further comprising casting a middle layer of the light guide from a transparent plastic, wherein the middle layer comprises the plurality of cutouts and the plurality of transmissive sections.
      • 13. The method of claim 12, further comprising, after casting the middle portion of the light guide, casting an inside layer and an outside layer around the middle layer using a 2-shot process.
        • 14. The method of claim 13, wherein the inside layer and the outside layer expose a circular ring along a bottom of the middle layer comprising the plurality of cutouts, and a ring around a top of the middle layer that acts as a substantially circular output surface for the light guide.
  • 15. A light ring assembly for a smart-home device, the light ring assembly comprising: a light guide having a cylindrical shape and comprising an inside layer comprising a first opaque material; an outside layer comprising a second opaque material; and a middle layer comprising a transparent material, wherein the transparent material of the middle layer comprises: a plurality of cutouts configured to receive a plurality of light-emitting diodes (LEDs); and a plurality of transmissive sections that extend away from the plurality of cutouts, wherein the plurality of transmissive sections have scalloped profiles that radiate outward from the plurality of cutouts, such that light from the LEDs is gradually reflected as it travels through the middle layer towards a substantially circular output surface of middle layer.
    • 16. The light ring assembly of claim 15, wherein the first opaque material comprises a cast from an opaque plastic.
    • 17. The light ring assembly of claim 15, wherein the transparent material comprises a cast from a transparent plastic.
    • 18. The light ring assembly of claim 15, wherein the inside layer and the outside layer form a light mask around the middle layer.
    • 19. The light ring assembly of claim 15, wherein the inside layer and the outside layer expose a circular ring along a bottom of the middle layer that comprises the plurality of cutouts; andthe inside layer on the outside layer expose a substantially circular output surface along a top of the middle layer.
    • 20. The light ring assembly of claim 15, further comprising a printed circuit board, wherein the plurality of LEDs are mounted to the printed circuit board and the middle layer is placed adjacent to the printed circuit board such that the plurality of LEDs fit inside the plurality of cutouts.
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