Patent ID: 8107255

Claim:
A circuit device, comprising: a case member; a first circuit board fitted into 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 first circuit element fixed to a principal surface of the first circuit board; and a second circuit element fixed to a principal surface of the second circuit board, wherein an opening is formed in the bottom portion of the case member and surrounds a side surface of the first circuit board, the opening comprising a plurality of openings, each of which is connected to the internal space of the case member so that the internal space and the opening in the bottom portion together form a conduit for air flow and the bottom portion of the case member further comprises a center opening, the first circuit board is fitted into the center opening of the case member, and the plurality of openings surrounds the center opening; and a sealing resin covering at least the principal surface of the first circuit board and the first circuit element and covering at least the principal surface of the second circuit board and the second circuit element.