| 摘要 |
<p>PURPOSE:To prevent the imitation and copying of a wiring pattern by a method wherein false through holes, with which no electric connection is performed, is provided in a multilayer wiring structure. CONSTITUTION:A plurality of false through holes 6a and 6b, of almost same apparent size as through holes 5a-5e, with which the lower layer wirings 3a-3e and the upper layer wirings 7a-7c are not electrically connected, are formed. As result, the wirings 3a, 3b, 3c, 3d and 3e are looked like as if they are connected to the wirings 7a via the through holes 5a, 5b, 5c, 6a and 6b by a third person who has no circuit diagram. As a result, the wiring pattern can be prevented from imitation and copying.</p> |
