US 12,256,523 B2
Board unit
Shun Takamizawa, Yokkaichi (JP); and Shigeki Yamane, Yokkaichi (JP)
Assigned to AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
Appl. No. 18/246,195
Filed by AutoNetworks Technologies, Ltd., Yokkaichi (JP); Sumitomo Wiring Systems, Ltd., Yokkaichi (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Jul. 30, 2021, PCT No. PCT/JP2021/028309
§ 371(c)(1), (2) Date Mar. 22, 2023,
PCT Pub. No. WO2022/064842, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 2020-159655 (JP), filed on Sep. 24, 2020.
Prior Publication US 2023/0354555 A1, Nov. 2, 2023
Int. Cl. H05K 7/20 (2006.01); H05K 1/14 (2006.01); H05K 1/18 (2006.01)
CPC H05K 7/2039 (2013.01) [H05K 1/144 (2013.01); H05K 1/181 (2013.01); H05K 2201/042 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A board unit comprising:
a board stack including a first circuit board and a second circuit board that are supported while being spaced apart from each other;
an electronic component mounted on the first circuit board;
a first heat dissipation member that covers the board stack from outside of the first circuit board;
a second heat dissipation member that covers the board stack from outside of the second circuit board;
a first heat transfer portion that thermally connects the electronic component and the first heat dissipation member; and
a second heat transfer portion that thermally connects the electronic component and the second circuit board,
wherein the electronic component has a body located between the first circuit board and the second circuit board,
the second heat transfer portion is partially provided at a position that corresponds to the body of the electronic component,
the second heat transfer portion includes a metal member,
the metal member includes a fixed portion fixed to the second circuit board, and a first protruding portion that protrudes from the second circuit board toward the body, and
the first protruding portion is not fixed to the electronic component.