Murata Manufacturing Co., Ltd.

Takeaki Tamayama

Akihiro Motoki

Kenichi Ishizuka

A circuit block assembly is provided that includes circuit blocks that each include a circuit board and a semiconductor element that is disposed on a first main surface of the circuit board. Moreover, each of the circuit blocks includes a metal heat spreader that is connected to the semiconductor element directly or by a thermally conductive member interposed therebetween. A thermally conductive sheet is provided that is thermally connected to the heat spreader. The thermally conductive sheet has a specific electrical resistance higher than a specific electrical resistance of the heat spreader.

Circuit block assembly

An electronic device includes an antenna, and a plate-shaped heat spreader including first and second metal layers that are stacked, a working fluid in an enclosed space interposed between the first and second metal layers, and a joint along which outer peripheral portions around the enclosed space are joined. The heat spreader includes an operational region in which the enclosed space is located and a quasi-operational region other than the enclosed space. The antenna is provided in the quasi-operational region in a plan view of the heat spreader.

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Nagaokakyo, Japan

Takeaki Tamayama