Heat sink

Abstract

A heat sink adapted for removing heat from a plurality of LEDs, includes a heat-conducting member, a plurality of conducting arms extending radially and outwardly from a periphery of the heat-conducting member and a plurality of outer fins perpendicularly extending from at least a lateral side of each of the conductive arms. The outer fins are spaced from and surround the heat-conducting member. Outer faces of outermost ones of the outer fins are used for thermal connection with the LEDs, whereby heat generated by the LEDs is absorbed by the heat sink. A plurality of spaces is defined between the outer fins, the heat-conducting member and the conducting arms and through bottom and top of the heat sink, whereby the heat absorbed by the heat sink can be easily dissipated to surrounding atmosphere along a vertical direction.

1 . A heat sink adapted for removing heat from LEDs of an LED lamp, the heat sink comprising:
 a heat-conducting member; and   
     a plurality of outer fins being spaced from and surrounding the heat-conductive member, the outer fins having outermost ones forming outer contacting faces adapted for contacting with the LEDs. 
   
   
       2 . The heat sink of  claim 1 , wherein each of the contacting faces of the outermost ones of the outer fins is flat. 
   
   
       3 . The heat sink of  claim 1 , wherein the heat-conducting member is a cylinder with a through hole defined therein. 
   
   
       4 . The heat sink of  claim 3 , wherein the cylinder has a plurality of inner fins extending inwardly from an inner wall thereof. 
   
   
       5 . The heat sink of  claim 4 , wherein a thickness of each of the inner fins decreases gradually from the inner wall of the cylinder to a distal end of the each of the inner fins. 
   
   
       6 . The heat sink of  claim 1 , wherein a plurality of conducting arms extend outwardly from an outer wall of the cylinder, and the outer fins extend from two lateral sides of each of the conducting arms. 
   
   
       7 . The heat sink of  claim 6 , wherein the conducting arms radially and evenly extend from the outer wall of the cylinder. 
   
   
       8 . The heat sink of  claim 7 , wherein the conducting arms are centrosymmetric relative to a central axis of the cylinder. 
   
   
       9 . The heat sink of  claim 8 , wherein the outer fins are perpendicular to a corresponding conducting arm from which the outer fins are extended, and the outer fins which extend from the corresponding conducting arm are divided into a plurality of pairs each being symmetrical to the corresponding conducting arm. 
   
   
       10 . The heat sink of  claim 6 , wherein lengths of the outer fins extending from each of the conducting arms are gradually increased along a direction from the heat-conducting member to a distal end of a corresponding conducting arm. 
   
   
       11 . The heat sink of  claim 10 , wherein the distal end of the corresponding conducting arm terminates at an inner face of a corresponding outermost one of corresponding outer fins, the inner face being opposite to the contacting face of the corresponding outermost one of the corresponding outer fins. 
   
   
       12 . A heat sink adapted for removing heat from a plurality of heat-generating components comprising:
 a heat-conducting member;   a plurality of conducting arms extending radially and outwardly from a periphery of the heat-conducting member; and   
     a plurality of outer fins perpendicularly extending from at least a lateral side of the conductive arm, the outer fins spaced from and surrounding the heat-conducting member; 
     wherein outer faces of outermost ones of the outer fins are adapted for contacting with the heat-generating components. 
   
   
       13 . The heat sink of  claim 12 , wherein the heat-conducting member is a cylinder with a through hole defined therein, a plurality of inner fins extending inwardly from an inner wall of the cylinder. 
   
   
       14 . The heat sink of  claim 13 , wherein the inner fins are centrosymmetric relative to a central axis of the cylinder and thicknesses of the inner fins decrease inwardly. 
   
   
       15 . The heat sink of  claim 12 , wherein the conducting arms are centrosymmetric relative to a central axis of the cylinder, the outer fins are formed at two lateral sides of each of the conductive arms. 
   
   
       16 . The heat sink of  claim 15 , wherein lengths of the outer fins are increased outwardly from the cylinder to distal ends of the conducting arms. 
   
   
       17 . The heat sink of  claim 16 , wherein each distal end of the conducting arms terminates at an inner face of an outermost one of corresponding outer fins, and an outer face of the outermost one of the corresponding outer fins is flat adapted for contacting with the electronic components. 
   
   
       18 . A heat sink adapted for cooling LEDs, comprising:
 a tube-shaped heat conductive member;   a plurality of arms extending outwardly from an outer side of the heat conductive member;   a plurality of outer fins connected to outer ends of the arms, respectively, each outer fin having a flat outer surface adapted for thermally connecting with the LEDs;   wherein a plurality of spaces is defined between the heat conductive member, the arms and the outer fins and extends through top and bottom of the heat sink.   
   
   
       19 . The heat sink of  claim 18  further comprising a plurality of additional outer fins extending from the arms and located between the outer fins and the heat conductive member. 
   
   
       20 . The heat sink of  claim 19  further comprising a plurality of inner fins extending inwardly from an inner side of the heat conductive member.