Patent ID: 7054159

Claim:
A printed wiring board with an electronic component mounted on a circuit board in which the electronic component is provided with a heat radiating plate for conducting heat internally generated, comprising: a first heat radiating pattern for conducting heat which is formed on a front surface of said circuit board, and connected to said heat radiating plate of the electronic component by soldering; a second heat radiating pattern for conducting heat which is formed on a rear surface of said circuit board at a position being opposed to said electronic component, and heat radiating means mounted on said second heat radiating pattern by soldering at a position being opposed to the electronic component, wherein said heat radiating plate and said first radiating pattern have a same area whereas said second heat radiating pattern has a larger area than that of said first radiating pattern or said heat radiating plate, wherein said heat radiating means is made of metal, and is provided, on a rear side thereof, with a plated layer which is able to be brought into contact with said circuit board and on a front side thereof, with a plurality of fins for radiating heat, wherein said plurality of fins for radiating heat forms a corrugated cross-section being uniformly shaped in such a way that a long-length of a belt-shaped hoop material is extruded and cut at prescribed length, and wherein said second heat radiating pattern is formed apart from the electronic component on the rear surface of said circuit board and serves as a grounding electrode for the electronic component.