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Lighting device

  • US 10,260,724 B2
  • Filed: 04/05/2018
  • Issued: 04/16/2019
  • Est. Priority Date: 09/02/2011
  • Status: Active Grant
First Claim
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1. A lighting device comprising:

  • a cover having an opening formed in a lower portion with an empty interior;

    a heat sink including;

    a base member coupled to the cover, the base member including a first surface that is a top surface proximate to the cover; and

    a member protruding into the empty interior of the cover from the top surface of the base member in a first direction into the cover, the first direction being perpendicular to the top surface of the base member, the member including a top surface and at least one of a side surface,wherein the at least one of the side surface of the member is perpendicular to the top surface of the base member,wherein the at least one of the side surface of the member includes a first region and a second region, wherein the first region locates higher than a one-third point of a first distance, wherein the second region locates lower than the one-third point, wherein the first distance is a vertical height from the first surface of the base member to the top surface of the member,wherein the heat sink comprises a plurality of heat radiating fins extended outwardly from a side of the base member in a second direction perpendicular to the first direction, wherein each of the plurality of heat radiating fins includes a first point disposed furthest from the side of the base member in the second direction; and

    a light source which comprises a substrate disposed on the first region of the at least one of the side surface of the member, wherein the second region of the at least one of the side surface of the member excludes the light source, wherein the substrate has a center point, wherein the top surface of the member excludes the light source;

    wherein a first angle between a vertical axis and a first imaginary line is greater than 0° and

    equal to or less than 45°

    , wherein the vertical axis passes through the center point of the light source and is perpendicular to the top surface of the base member, wherein the first imaginary line passes from the center point of the light source to the first point of the heat radiating fins,wherein a first imaginary plane includes a top surface of the substrate of the light source, passes through the center point and is perpendicular to the top surface of the base member,wherein a second angle between the vertical axis and a second imaginary line is greater than 0° and

    equal to or less than 45°

    , andwherein the second imaginary line passes through the center point and contacts with the heat sink at the first imaginary plan.

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