Patent ID: 11963298
Assignee: IBIDEN CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A printed wiring board, comprising:
a base insulating layer;
a conductor layer formed on the base insulating layer and including a first conductor pad and a second conductor pad;
a solder resist layer formed on the base insulating layer such that the solder resist layer is covering the conductor layer and has a first opening exposing the first conductor pad and a second opening exposing the second conductor pad;
a first bump formed on the first conductor pad of the conductor layer and comprising a first base plating layer formed in the first opening of the solder resist layer and a first top plating layer formed on the first base plating layer; and
a second bump formed on the second conductor pad of the conductor layer and comprising a second base plating layer formed in the second opening of the solder resist layer and a second top plating layer formed on the second base plating layer,
wherein the solder resist layer is formed such that the second opening has a diameter smaller than a diameter of the first opening, the second bump is formed such that the second bump has a diameter smaller than a diameter of the first bump, and the conductor layer is formed such that the first conductor pad has a first recess formed on a surface of the first conductor pad, that the second conductor pad has a second recess formed on a surface of the second conductor pad, and that a depth of the first recess is larger than a depth of the second recess.