Patent ID: 8102655
Filing Date: 2012-01-24
Classification: H01L,H05K

Abstract:
1. A circuit device, comprising: a case member; a first circuit board attached to a bottom portion of the case member; a second circuit board fitted into the case member so as to define an internal space between the first and second circuit boards; a semiconductor element mounted on a principal surface of the first circuit board; and a circuit element mounted on a principal surface of the second circuit board and controlling the semiconductor element, wherein the first circuit board is smaller than the second circuit board, the bottom portion of the case member comprises a lattice-like frame having a center lattice cell opening into which the first circuit board fits and a peripheral lattice cell opening that is connected to the internal space of the case member so that the internal space and the peripheral opening of the bottom portion form a conduit for air flow, and a bottom surface of the first circuit board opposite from the principal surface on which the semiconductor element is mounted is not covered by any device element of the circuit device so that the bottom surface of the first circuit board is exposed.