CIRCUIT DEVICE
First Claim
1. 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 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, andthe bottom portion of the case member has an opening connected to the internal space of the case member so that the internal space and the opening of the bottom portion form a conduit for air flow.
7 Assignments
0 Petitions
Accused Products
Abstract
Provided is a circuit device capable of increasing the packaging density and preventing the thermal interference between circuit elements to be incorporated. In a hybrid integrated circuit device, a first circuit board and a second circuit board are fitted into a case member in a way that the first circuit board is overlaid with the second circuit board. A first circuit element is arranged on the upper surface of the first circuit board and a second circuit element is arranged on the upper surface of the second circuit board. Furthermore, inside the case member, provided is a hollow portion that is not filled with a sealing resin. Such a configuration prevents the second circuit element, which is a microcomputer, from operating unstably due to a heat generated in the first circuit element, which is a power transistor, for example.
52 Citations
4 Claims
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1. A circuit device, comprising:
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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 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, and the bottom portion of the case member has an opening connected to the internal space of the case member so that the internal space and the opening of the bottom portion form a conduit for air flow. - View Dependent Claims (2, 3, 4)
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Specification