Patent ID: 7405365

Claim:
A wiring substrate, comprising a short ring formed along a periphery of the substrate, an independent line pattern that is coplanar with and independent of the short ring, a first continuous line pattern that is coplanar and continuous with the short ring, a second continuous line pattern that is located between the independent line pattern and the first continuous line pattern and is coplanar and continuous with the short ring, and an insulating film covering the independent line pattern and the first and second continuous line patterns, wherein: the insulating film includes a first through hole reaching the independent line pattern, a second through hole reaching the first continuous line pattern, and a third through hole reaching the second continuous line pattern; the independent line pattern and the first continuous line pattern are electrically connected to each other by a connection pattern bridging the second continuous line pattern via the first through hole and the second through hole; and the third through hole is formed in an area other than an area where the connection pattern is formed.