Heat sink and lighting device comprising a heat sink

Abstract

A heat sink may include a light source region for mounting a light source; a heat spreading and dissipation structure covering at least part of an exterior of the heat sink; wherein the structure comprises vertically aligned fins; wherein the structure comprises an air flow channel leading from a bottom region to a lateral region, the air flow channel being created by a gap between adjacent fins; wherein the light source region comprises an open cavity formed by a cavity wall comprising a light source mounting region adapted to receive the light source; wherein the fins are integrally connected to the exterior of the cavity wall; wherein the heat sink comprises a solid heat sink base extending from the light source mounting region to the exterior and protruding from the cavity wall; and wherein the structure is in thermal connection with the heat sink base.

1 . A heat sink, comprising
 a light source region for mounting a light source;   a heat spreading and dissipation structure covering at least part of an exterior of the heat sink including a bottom region and a lateral region;   
       wherein the heat spreading and dissipation structure comprises a plurality of vertically aligned fins;
 wherein the heat spreading and dissipation structure comprises at least one air flow channel leading from the bottom region to the lateral region, the air flow channel being created by a gap between adjacent fins and comprising a lateral exit; 
 
       wherein the light source region comprises an open cavity formed by a cavity wall, the cavity wall comprising a light source mounting region adapted to receive at least one light source; 
       wherein the fins are integrally connected to the exterior of the cavity wall, including a bottom wall; 
       wherein the heat sink comprises a solid heat sink base extending from the light source mounting region to the exterior and protruding from the cavity wall; and 
       wherein the heat spreading and dissipation structure is in thermal connection with the heat sink base. 
     
     
         2 . The heat sink according to  claim 1 ,
 wherein the heat spreading and dissipation structure is covered on top.   
     
     
         3 . The heat sink according to  claim 1 ,
 wherein the light source comprises a light emitting diode submount.   
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . The heat sink according to  claim 1 ,
 wherein at least one of the following conditions hold:
 a circumferential distance C 1  between two adjacent fins is in the range of 0.4 mm≦C 1 ≦8 mm; 
 a thickness F 1  of the fin is in the range of 0.1 mm≦F 1 ≦3 mm; 
 a lateral length F 2  of the fins is in the range of 5 mm≦F 2 ≦40 mm. 
   
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The heat sink according to  claim 1 ,
 the fins at least partially showing a rectangular cross section.   
     
     
         12 . The heat sink according to  claim 1 ,
 the fins at least partially showing a pointed cross section.   
     
     
         13 . The heat sink according to  claim 1 ,
 the fins at least partially showing a triangular cross section.   
     
     
         14 . The heat sink according to  claim 1 ,
 the fins at the bottom of the cavity wall radially extending in at least one of a straight pattern and a squir 1  pattern.   
     
     
         15 . (canceled) 
     
     
         16 . The heat sink according to  claim 1 ,
 wherein the heat sink base has a tapered shape with the base positioned at the light source mounting region, wherein the tapered shape of the heat sink base is that of a cone.   
     
     
         17 . (canceled) 
     
     
         18 . (canceled) 
     
     
         19 . (canceled) 
     
     
         20 . The heat sink according to  claim 1 ,
 satisfying at least one of the following conditions:
 a height h of the cavity ranges between 30 mm and 80 mm; 
 a width L 1  of the bottom of the cavity ranges between 20 mm and 60 mm; 
 a width L 2  of the top of the cavity ranges between 80 mm and 120 mm; 
 a ratio Rt of a width of the top of the cavity and a width of the bottom of the cavity lie in the range of 1.25≦Rt≦5; 
 a base width Lt of the heat sink base is in the range of L 1 ≦Lt≦1.5·L 1 , 
 an apex width Lc of the heat sink base is in the range of 0≦Lc≦L 1 ; 
 a height Hb of the heat sink base is in the range of 0.05·L 1 ≦Hb<0.5·L 1 ; 
 a height He of the lateral exit is in the range of 0.1·Hc≦He≦0.6·Hc; 
 an overall height Hc of the fins is in the range of Hb≦Hc≦h+Hb; 
 a thickness Dw of the lateral cavity wall is in the range of 0.5 mm≦Dw≦10 mm. 
   
     
     
         21 . (canceled) 
     
     
         22 . (canceled) 
     
     
         23 . (canceled) 
     
     
         24 . (canceled) 
     
     
         25 . (canceled) 
     
     
         26 . (canceled) 
     
     
         27 . (canceled) 
     
     
         28 . (canceled) 
     
     
         29 . (canceled) 
     
     
         30 . (canceled) 
     
     
         31 . (canceled) 
     
     
         32 . (canceled) 
     
     
         33 . (canceled) 
     
     
         34 . The heat sink according to  claim 1 ,
 the at least one air flow channel having an enlarged air flow cross section at or in the vicinity of the lateral air outlet opening.   
     
     
         35 . The heat sink according to  claim 1 , further comprising:
 at least one mounting column for attaching the heat sink to a lighting device, wherein the at least one mounting column is adapted to secure at least one printed circuit board.   
     
     
         36 . (canceled) 
     
     
         37 . A lighting device, comprising:
 a heat sink, comprising:   a light source region for mounting a light source;   a heat spreading and dissipation structure covering at least part of an exterior of the heat sink including a bottom region and a lateral region;   wherein the heat spreading and dissipation structure comprises a plurality of vertically aligned fins;   wherein the heat spreading and dissipation structure comprises at least one air flow channel leading from the bottom region to the lateral region, the air flow channel being created by a gap between adjacent fins and comprising a lateral exit;   wherein the light source region comprises an open cavity formed by a cavity wall, the cavity wall comprising a light source mounting region adapted to receive at least one light source;   wherein the fins are integrally connected to the exterior of the cavity wall, including a bottom wall;   wherein the heat sink comprises a solid heat sink base extending from the light source mounting region to the exterior and protruding from the cavity wall; and   wherein the heat spreading and dissipation structure is in thermal connection with the heat sink base.   
     
     
         38 . The lighting device according to  claim 37 , further comprising:
 an air flow generator adapted to supply an air flow to the air flow channels, wherein the air flow generator is adapted to supply an air flow to the bottom of the air flow channels.   
     
     
         39 . (canceled) 
     
     
         40 . (canceled) 
     
     
         41 . The lighting device according to  claim 37 ,
 wherein the air flow generator is spaced apart from the heat sink by an air guide structure, wherein the air guide structure comprises an open space.   
     
     
         42 . (canceled) 
     
     
         43 . The lighting device according to  claim 41 ,
 wherein the open space has a basic shape of a straight tube.   
     
     
         44 . The lighting device according to  claim 41 ,
 wherein the open space is hourglass shaped.   
     
     
         45 . The lighting device according to  claim 41 ,
 wherein a height of the air guide structure is in the range between a half of a height of the forced air flow generator and twice the height of the forced air flow generator.