Denso Corporation

Masaji Imada

Masayuki Takenaka

Norihisa Imaizumi

Hiromasa Hayashi

Yuuki Sanada

Shinya Uchibori

Toshihiro Nakamura

Hiroshi Kasugai

Eiji Yabuta

In an electronic device, a heat generating element is connected directly to an electrically-conductive joining material that is the start point of the heat dissipation path on the one surface of the substrate, and the other surface of the substrate is provided by an other surface side insulating layer. An electrically-conductive other surface side electrode connected to an external heat dissipation member is disposed on the surface of the other surface side insulating layer right under the heat generating element. On the other surface side of the substrate, an other surface side inner layer wire that is the end point of the heat dissipation path extends to the other surface side insulating layer and is insulated electrically from the other surface side electrode through the other surface side insulating layer.

Electronic device

A laser welding structure includes a lead, a conductive member, and a welding part. The lead has a nickel plating layer and is made of copper or copper alloy. The conductive member is joined with the lead and is made of copper or copper alloy. The welding part is formed by a laser welding so as to join the lead and the conductive member. An end portion of the welding part has a rounded convex shape.

Laser welding structure

Growing community of inventors

Toyohashi, Japan

Masaji Imada