Patent ID: 7714232

Claim:
A circuit device comprising: conductive patterns on a front surface of a circuit substrate; an insulating layer on the front surface of the circuit substrate; and circuit elements electrically connected to the conductive patterns, wherein the circuit substrate is metal, the insulating layer comprises a resin material, the conductive patterns are on the insulating layer and include a first conductive pattern and a second conductive pattern thicker than the first conductive pattern, back surfaces of the first and second conductive patterns are at substantially equal levels, a protruding portion is on a front surface of the second conductive pattern and integrally formed with the second conductive pattern in a single body, the protruding portion protruding, in a thickness direction, from the front surface of the second conductive pattern, the circuit elements comprise a power transistor mounted to the front surface of the second conductive pattern, and an edge portion of the second conductive pattern is formed around the protruding portion, the edge portion having a thickness substantially equal to that of the first conductive pattern and a width larger than the thickness of the first conductive pattern.