Ibiden Company Limited

Sho Akai

Tatsuya Imai

Iku Tokihisa

Toru Nakai

Yoichiro Kawamura

Katsuhiko Tanno

Masanori Iriyama

A multilayer printed wiring board including a first interlayer resin insulation layer, a first conductive circuit formed on the first interlayer resin insulation layer, a second interlayer resin insulation layer formed on the first interlayer resin insulation layer and the first conductive circuit and having an opening portion exposing a portion of the first conductive circuit, a second conductive circuit formed on the second interlayer resin insulation layer, a via conductor formed in the opening portion of the second interlayer resin insulation layer and connecting the first conductive circuit and the second conductive circuit, and a coating layer having a metal layer and a coating film and formed between the first conductive circuit and the second interlayer resin insulation layer. The metal layer is formed on the surface of the first conductive circuit and the coating film is formed on the metal layer.

Multilayer printed wiring board and method for manufacturing multilayer printed wiring board

A multilayer printed wiring board includes a first interlaminar resin insulating layer, a first conductor circuit formed on the first interlaminar resin insulating layer, a second interlaminar resin insulating layer formed on the first interlaminar resin insulating layer and the first conductor circuit, a second conductor circuit formed on the second interlaminar resin insulating layer. A via conductor can be formed in the opening portion. The opening portion of the second interlaminar resin insulating layer can expose a face of the first conductor circuit. The via conductor connects the first conductor circuit and the second conductor circuit. The via conductor includes an electroless plating film formed on inner wall face of the opening portion and includes an electrolytic plating film formed on the electroless plating film and on the exposed face of the first conductor circuit exposed by the opening portion. The second conductor circuit includes the electroless plating film and the electrolytic plating film.

Method of manufacturing multilayer printed wiring board

A multilayer printed wiring board including a first interlayer resin insulation layer, a pad formed on the first interlayer resin insulation layer, a solder resist layer formed on the first interlayer resin insulation layer and the pad, a protective film formed on a portion of the pad exposed by an opening of the solder resist layer, and a coating layer formed between the pad and the solder resist layer. The pad mounts an electronic component. The coating layer has a metal layer and a coating film. The metal layer is formed on the surface of the pad and the coating film is formed on the metal layer.

Method for manufacturing multilayer printed wiring board

A method of manufacturing a multilayer printed wiring board includes forming a first interlaminar resin insulating layer, a first conductor circuit on the first interlaminar resin insulating layer, a second interlaminar resin insulating layer, opening portions in the second interlaminar resin insulating layer to expose a face of the first conductor circuit, an electroless plating film on the second interlaminar resin insulating layer and the exposed face, and a plating resist on the electroless plating film. The method further includes substituting the electroless plating film with a thin film conductor layer, having a lower ion tendency than the electroless plating film, and a metal of the exposed face, forming an electroplating film including the metal on a portion of the electroless plating film and the thin film conductor layer, stripping the plating resist, and removing the electroless plating film exposed by the stripping.

Multilayer printed wiring board and method of manufacturing multilayer printed wiring board

A solder ball is loaded on a bump having a small height (FIG.(B)) and the height of the bump is intensified by melting the solder ball by heating with laser (FIG.(C)). Thus, the heights of the bumps are adjusted within a requested allowable range. Because the bump is not removed by heating when the height of the low bump is intensified, the printed wiring board is not subjected to local heat history thereby intensifying reliability of the bump of a printed wiring board.

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Ibi-gun, Japan

Sho Akai