Patent ID: 7606027

Claim:
An electronic apparatus comprising: a circuit board; a plurality of circuit elements mounted on a top surface of the circuit board, the plurality of circuit elements including a heat generating element; and a cooling structure that includes a heat spreader, a plurality of cooling fins integrally formed with the heat spreader, an air inlet, an air outlet, and a fan device for generating cooling air flowing from the air inlet to the air outlet, wherein the heat spreader is placed above the circuit board and thermally joined to the heat generating element mounted on the circuit board, wherein the plurality of cooling fins extends from a bottom surface of the heat spreader toward the top surface of the circuit board to provide a plurality of air passages between the top surface of the circuit board and the bottom surface of the heat spreader, wherein the air inlet and the air outlet communicate with each other through the plurality of air passages, wherein a first one of the plurality of cooling fins has a first length measured from the bottom surface of the heat spreader and located above a first one of the plurality of circuit elements to provide a first clearance therebetween, the first one of the plurality of circuit elements having a first height measured from the top surface of the circuit board, wherein a second one of the plurality of cooling fins has a second length measured from the bottom surface of the heat spreader and located above a second one of the plurality of circuit elements to provide a second clearance therebetween, the second one of the plurality of circuit elements having a second height measured from the top surface of the circuit board, wherein the first length is greater than the second length, and wherein the first height is less than the second height.