Patent ID: 9326389
Filing Date: 2016-04-26
CPC Classification: H01L,H05K,Y10T

Claim Text:
1. A wiring board comprising: an insulating board having a mounting portion configured such that a semiconductor element is mounted on an upper surface thereof; a semiconductor element connection pad formed on the mounting portion; a conductor pillar formed on the semiconductor element connection pad; and a solder resist layer adhered on the insulating board, wherein the solder resist layer has a first region with a thickness such that the semiconductor element connection pad and a lower end portion of the conductor pillar are embedded while an upper end portion of the conductor pillar protrudes, and a second region having a thickness larger than that of the first region and surrounding the first region, wherein the semiconductor element is placed on top of the conductor pillar to be connected therewith, and a gap between the semiconductor element and the solder resist layer in the first region is filled with an under fill.