Patent ID: 9485864
Filing Date: 2016-11-01
CPC Classification: H01L,H05K,Y02P

Claim Text:
1. A bump structure provided on an electrode pad, comprising: a solder member; and a metal layer having a cylindrical portion covering a side surface of the solder member and a bottom portion covering a bottom surface of the solder member, the metal layer being made of a metal which is higher in melting point than the solder member, wherein an upper part of the cylindrical portion of the metal layer is opened wide, the bottom portion of the metal layer is electrically connected to the electrode pad, a bottom-side-part of the metal layer is embedded in an insulating resin layer formed on the electrode pad, and a top-side-part of the metal layer is protruded from the insulating resin layer, a top-part of the cylindrical portion of the metal layer is extended in a direction perpendicular to a central axis of the cylindrical portion, and the top-part of the cylindrical portion of the metal layer that is extended in the direction perpendicular to the central axis of the cylindrical portion is not in contact with the insulating resin layer.