Patent ID: 7421779
Filing Date: 2008-09-09
Classification: H05K,Y10T

Abstract:
1. A manufacturing method of a multi-layer board, the method comprising: forming at least a first internal layer base material which has a conductive circuitry at one side surface of an insulating layer and which has an interlayer conductive portion for electrically connecting the conductive circuitry and other side surface of the insulating layer; forming a second internal layer base material having a conductive circuitry at one side surface of an insulating layer; colaminating the first internal layer base material and the second internal layer base material to electrically connect the interlayer conductive portion of the first internal layer base material and the conductive circuitry of the second internal layer base material to one another; subsequently forming a second interlayer conductive portion at the insulating layer of the second internal layer base material in order to electrically connect the conductive circuitry formed at the one side surface of the second internal layer base material and the other side surface of the second internal layer base material; and forming minute circuitry at the other side surface of the second internal layer base material, wherein the minute circuitry is finer than the conductive circuitries of the first and second internal base layer materials.