Patent ID: 8659168
Filing Date: 2014-02-25
Classification: H01L,H05K

Abstract:
1. A wiring board, comprising: a mounting surface where an electronic component is to be mounted, the electronic component having a plurality of external connecting terminals on a surface thereof; an insulating layer formed on the mounting surface; and a plurality of opening parts each formed in the insulating layer between a center and a periphery of the wiring board so that a plurality of wiring patterns are commonly and partially exposed, the wiring patterns having electrodes where the external connecting terminals of the electronic component are to be connected, wherein each of the opening parts is defined by first and second opposed edges of the insulating layer, at least one of the opening parts has the first edge thereof formed in an oblique direction against extending directions of the wiring patterns, and respective exposed areas of the wiring patterns exposed in the at least one of the opening parts are almost equal to each other with the wiring patterns having respective ends toward the periphery of the wiring board positioned on a line oblique to the extending directions of the wiring patterns in the at least one of the opening parts.