Patent ID: 7114550

Claim:
A cooling device for heat-generating elements comprising: (1) a surface section wherein a plurality of heat-generating elements are arranged in a substantially radial manner; and (2) a heat sink that performs cooling of said heat-generating elements by flow of coolant in a coolant passage formed in an interior of said surface section; wherein said heat sink comprises: (a) a coolant introduction chamber which introduces coolant from a coolant inlet formed in said coolant passage; (b) a coolant contact chamber (i) formed in said coolant passage and (ii) configured to permit coolant from said coolant introduction chamber into contact with back face of a surface on which said heat-generating elements are arranged; and (c) a nozzle for injecting said coolant towards said back face side, between said coolant introduction chamber and said coolant contact chamber which is adjacent to the coolant introduction chamber; said coolant introduction chamber is formed at said back face side of said heat-generating elements arranged in or substantially in a middle portion of said back face side; said coolant contact chamber comprises a first coolant contact chamber formed so as to surround said coolant introduction chamber in a direction of said face where said heat-generating elements are arranged; at least one additional coolant contact chamber, formed surrounding and in fluid communication with said first coolant contact chamber; a nozzle formed between said coolant introduction chamber and said first coolant contact chamber, said nozzle being a single central nozzle formed in a central position within said chambers; and a plurality of nozzles for injecting said coolant towards said back face side being formed between said at least one additional coolant contact chamber, said plurality of nozzles being peripheral nozzles formed so as to be positioned in radial fashion about said central nozzle as center; wherein the diameter of nozzles other than the single central nozzle decreases as the distance from the single central nozzle increases.