Patent ID: 7782628
Filing Date: 2010-08-24
Classification: H01L,H05K

Abstract:
1. A circuit device, comprising: a case member; a first circuit board and a second circuit board fitted into the case member and arranged in such a way that the first circuit board is overlaid by the second circuit board, the first circuit board having a first inner surface and a first outer surface opposite from the first inner surface, the second circuit board having a second inner surface and a second outer surface opposite from the second inner surface, and the first inner surface facing the second inner surface to define a cavity in the case member; a first circuit element secured to the first inner surface of the first circuit board; a second circuit element secured to the second outer surface of the second circuit board, the second circuit element having an operation temperature lower than the first circuit element and controlling an operation of the first circuit element; a first sealing resin covering the first circuit element on the first inner surface of the first circuit board; and a second sealing resin covering the second inner surface of the second circuit board, wherein the first and second sealing resins occupy the cavity so as to leave a hollow portion between the first and second circuit boards.