Cooling device with a plurality of fin pitches

Abstract

It is an object to provide a cooling device with an increased leeward cooling capacity without increasing the number of heat radiation fins to be installed and the amount of cooling air. The cooling device comprises a heat-receiving block thermally connected to a heat-generating element and heat radiation fin groups having a plurality of fins thermally connected to the heat-receiving block. A flow of cooling air is set in the direction parallel to the heat-receiving block. The plurality of heat radiation fin groups are arranged in tandem along the flow direction of the cooling air. Of the plurality of the heat radiation fin groups, the fin pitch of the heat radiation fin group arranged on the windward side of the cooling air is larger than the fin pitch of the heat radiation fin group arranged on the leeward side of the cooling air.

What is claimed: 
     
         1 . A cooling device, comprising:
 a heat-receiving block thermally connected to a heat-generating element; and   heat radiation fin groups having a plurality of fins thermally connected to the heat-receiving block,   wherein   a flow of cooling air is set in a direction parallel to the heat-receiving block,   the plurality of heat radiation fin groups are arranged in tandem along the flow direction of the cooling air, and   of the plurality of heat radiation fin groups, a fin pitch of a heat radiation fin group arranged on a windward side of the cooling air is larger than a fin pitch of a heat radiation fin group arranged on a leeward side of the cooling air.   
     
     
         2 . A cooling device, comprising:
 a heat-receiving block thermally connected to a heat-generating element; and   heat radiation fin groups having a plurality of fins erected on a surface of the heat-receiving block,   wherein   a flow of cooling air is set in a direction parallel to the heat-receiving block,   the plurality of heat radiation fin groups are arranged in tandem along the flow direction of the cooling air, and   of the plurality of heat radiation fin groups, a fin pitch of a heat radiation fin group arranged on a windward side of the cooling air is larger than a fin pitch of a heat radiation fin group arranged on a leeward side of the cooling air.   
     
     
         3 . A cooling device, comprising:
 a heat-receiving block thermally connected to a heat-generating element;   a plurality of heat pipes erected on a surface of the heat-receiving block; and   heat radiation fin groups having a plurality of fins mounted on the heat pipes,   wherein   a flow of cooling air is set in a direction parallel to the heat-receiving block,   the plurality of heat radiation fin groups are arranged in tandem along the flow direction of the cooling air, and   of the plurality of heat radiation fin groups, a fin pitch of a heat radiation fin group arranged on a windward side of the cooling air is larger than a fin pitch of a heat radiation fin group arranged on a leeward side of the cooling air.   
     
     
         4 . The cooling device according to any one of  claims 1  to  3 , wherein the fin pitch of the heat radiation fin group arranged on the windward side is an integer multiple of the fin pitch of the heat radiation fin group arranged on the leeward side. 
     
     
         5 . The cooling device according to any one of  claims 1  to  3 , wherein a length of the fins of the heat radiation fin group arranged on the windward side is shorter than a length of the fins of the heat radiation fin group arranged on the leeward side. 
     
     
         6 . The cooling device according to  claim 3 , wherein the heat pipes are U-shaped or L-shaped in side view. 
     
     
         7 . The cooling device according to any one of  claims 1  to  3 , wherein a fin surface temperature difference between the windward and leeward sides is equal in all the heat radiation fin groups.