Patent ID: 8648263
Filing Date: 2014-02-11
Classification: H05K,Y10T

Abstract:
1. A wiring board comprising: a first substrate; a second substrate having a smaller mounting area than a mounting area of the first substrate; a base substrate laminated between the first substrate and the second substrate such that the first substrate extends beyond an edge of the second substrate and the edge of the second substrate forms a step portion with respect to the first substrate; and an Interstitial Via Hole structure penetrating through the base substrate, wherein the first substrate and the second substrate are laminated to the base substrate such that the first substrate and the second substrate form a first end portion of the wiring board, the first substrate forms a second end portion of the wiring board on an opposite side of the first end portion of the wiring board, the second substrate does not form the second end portion of the wiring board, and the base substrate has an interlayer groove portion formed at the edge of the second substrate between the first substrate and the second substrate.