| 摘要 |
PURPOSE: To improve the heat resistance of an eyelet part by striking the eyelet whose surface is subjected to roughening treatment in advance into a specific reference hole for alignment between an inner-layer plate and a first prepreg, deforming the tip of the eyelet, and caulking an inner-layer plate and the prepreg. CONSTITUTION: Two inner-layer plates 3 where a wiring pattern is formed on front and reverse inner surfaces are laminated via a specific number of first prepregs 4a in-between. A reference hole is drilled at the specific position and is caulked by an eyelet 1 whose surface is roughened. In this manner, the caulked piece is heated and pressed for forming one piece by overlapping an outer-layer copper foil 5 via a second prepreg 4b. Heat-resistance property can be improved without causing interlayer peel-off at a hightemperature treatment including solder when mounting parts. |
