Heat diffusing device, electronic apparatus, and wick for heat diffusing device

Abstract

A heat diffusing device that includes: a housing that includes a first inner surface and a second inner surface facing each other in a thickness direction and defining an internal space; a working medium sealed in the internal space of the housing; and a wick having a sheet shape disposed in the internal space of the housing. The wick includes a first through- hole penetrating the wick in the thickness direction, and a second through-hole penetrating the wick in the thickness direction. A first protrusion protruding toward the first inner surface is on a peripheral edge of the first through-hole. A second protrusion protruding toward the second inner surface is on a peripheral edge of the second through-hole.

1 . A heat diffusing device comprising: 
 a housing including a first inner surface and a second inner surface that face each other in a thickness direction and define an internal space;   a working medium sealed in the internal space of the housing; and   a wick having a sheet shape disposed in the internal space of the housing,   wherein the wick includes:   a first through-hole penetrating the wick in the thickness direction, wherein a first peripheral edge of the first through-hole includes a first protrusion that protrudes toward the first inner surface, and   a second through-hole penetrating the wick in the thickness direction, wherein a second peripheral edge of the second through-hole includes a second protrusion that protrudes toward the second inner surface.   
     
     
         2 . The heat diffusing device according to  claim 1 , wherein a first distance between outer walls of the first protrusion is smaller toward a tip end of the first protrusion proximal to the first inner surface. 
     
     
         3 . The heat diffusing device according to  claim 2 , wherein a second distance between outer walls of the second protrusion is smaller toward a tip end of the second protrusion proximal to the second inner surface. 
     
     
         4 . The heat diffusing device according to  claim 1 , wherein a distance between outer walls of the second protrusion is smaller toward a tip end of the second protrusion proximal to the second inner surface. 
     
     
         5 . The heat diffusing device according to  claim 1 , wherein the wick includes a plurality of the first through-holes, and 
       a center-to-center distance between the plurality of first through-holes adjacent to each other is constant. 
     
     
         6 . The heat diffusing device according to  claim 1 , wherein the wick includes a plurality of the second through-holes, and 
       a center-to-center distance between the plurality of second through-holes adjacent to each other is constant. 
     
     
         7 . The heat diffusing device according to  claim 1 , wherein the wick includes a plurality of the first through-holes and a plurality of the second through-holes, and 
       a center-to-center distance between adjacent first and second through-holes of the plurality of the first through-holes and the plurality of the second through-holes is constant. 
     
     
         8 . The heat diffusing device according to  claim 1 , wherein, in the thickness direction, a distance between the wick and the first inner surface is smaller than a distance between the wick and the second inner surface. 
     
     
         9 . The heat diffusing device according to  claim 1 , wherein a height of the first protrusion is equivalent to a height of the second protrusion. 
     
     
         10 . The heat diffusing device according to  claim 1 , wherein at least one of a height of the first protrusion and a height of the second protrusion is larger than a conductor thickness of the wick. 
     
     
         11 . The heat diffusing device according to  claim 1 , wherein a height of the first protrusion is larger than a conductor thickness of the wick, and a height of the second protrusion is larger than the conductor thickness of the wick. 
     
     
         12 . An electronic apparatus comprising the heat diffusing device according to  claim 1 . 
     
     
         13 . A wick for a heat diffusing device, the wick having a sheet shape and comprising: 
       a first through-hole penetrating the wick in a thickness direction; 
       a second through-hole penetrating the wick in the thickness direction; 
       a first protrusion on a peripheral edge of the first through-hole and protruding in a first direction in the thickness direction; and 
       a second protrusion on a peripheral edge of the second through-hole and protruding in a second direction in the thickness direction opposite to the first direction. 
     
     
         14 . The wick according to  claim 13 , wherein a first distance between outer walls of the first protrusion is smaller toward a tip end of the first protrusion proximal to the first inner surface. 
     
     
         15 . The wick according to  claim 13 , wherein a second distance between outer walls of the second protrusion is smaller toward a tip end of the second protrusion proximal to the second inner surface. 
     
     
         16 . The wick according to  claim 13 , wherein the wick includes a plurality of the first through-holes, and 
       a center-to-center distance between the plurality of first through-holes adjacent to each other is constant. 
     
     
         17 . The wick according to  claim 13 , wherein the wick includes a plurality of the second through-holes, and 
       a center-to-center distance between the plurality of second through-holes adjacent to each other is constant. 
     
     
         18 . The wick according to  claim 13 , wherein a height of the first protrusion is equivalent to a height of the second protrusion. 
     
     
         19 . The wick according to  claim 13 , wherein at least one of a height of the first protrusion and a height of the second protrusion is larger than a conductor thickness of the wick. 
     
     
         20 . The wick according to  claim 13 , wherein a height of the first protrusion is larger than a conductor thickness of the wick, and a height of the second protrusion is larger than the conductor thickness of the wick.