Murata Manufacturing Co., Ltd.

Tomohiko Naruoka

Atsushi Kasuya

Nobuo Ikemoto

Kosuke Nishio

Makoto Takeoka

Noriaki Okuda

Masaki Kawata

Hayato Noma

A resin multilayer substrate includes a multilayer body including resin base-material layers laminated in a thickness direction and a circuit conductor therein, an end-surface ground conductor provided directly on each end surface of the multilayer body in the thickness direction, an adhesion layer on a side surface of the multilayer body, and a side-surface ground conductor on the adhesion layer. The end-surface and side-surface ground conductors are made of a ground conductor material with a coefficient of thermal expansion whose difference from a coefficient of thermal expansion of the resin base-material layers in a plane direction is smaller than a difference from a coefficient of thermal expansion of the resin base-material layers in the thickness direction. The adhesion layer is made of a material with higher adhesiveness to the side surface of the multilayer body than adhesiveness of the ground conductor material.

Resin multilayer substrate

A resin multilayer substrate includes a multilayer body including resin base-material layers in a thickness direction, a side-surface conductor on at least a side surface of the multilayer body and made of a metallic material with a coefficient of thermal expansion whose difference from a coefficient of thermal expansion of the resin base-material layers in a plane direction is smaller than a difference from a coefficient of thermal expansion of the resin base-material layers in the thickness direction, a circuit component in the multilayer body and defining a circuit, and inner conductors in the multilayer body, located between the side-surface conductor and the circuit component along the side-surface conductor, and at least partially overlapping each other when viewed in the thickness direction, each of the inner conductors being one of a dummy conductor and a ground conductor.

A component mount board includes a resin board, an electronic component, and a molding resin. A land conductor is provided in the resin board. The electronic component is mounted on a surface of the resin board, and includes a mounting terminal that is bonded to the land conductor. The resin board includes a body resin portion including the land conductor provided on a surface thereof, and a surface resin layer disposed on a surface of the body resin portion and made of a material of the same type as that of the body resin portion. A conductor is not provided on a surface of the surface resin layer. The surface resin layer includes a through hole at which the land conductor is exposed from the surface of the resin board. The mounting terminal is bonded to the land conductor via a bonding material filled in the through hole.

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Nagaokakyo, Japan

Tomohiko Naruoka