Patent ID: 7841074

Claim:
A method of fabricating a paste bump for a printed circuit board, comprising: preparing a base plate; printing a conductive paste on the base plate and drying the conductive paste on the base plate, thus forming a first paste bump; flattening an upper surface of the first paste bump through coining; and printing a conductive paste on the first paste bump and drying the conductive paste on the first bump, thus forming a second paste bump which has a height lower than or equal to that of the first paste bump, wherein the printing a conductive paste on the first paste bump and drying the conductive paste on the first bump comprises placing a second mask having a hole having a second size on the first paste bump; applying a conductive paste on the second mask, and pressing the conductive paste using a squeegee; filling the hole having a second size in the second mask with the conductive paste, and sticking a bottom of the conductive paste to an upper surface of the first paste bump; and removing the second mask, and drying the conductive paste, thus forming the second paste bump.