| 摘要 |
PROBLEM TO BE SOLVED: To provide an impedance checking laminated board which is capable of carrying out an impedance check in a short time. SOLUTION: A test pattern 1 whose impedance is to be measured, ground patterns 2, and metal foils 3 are laminated through the intermediary of insulating layer 4 into an inner circuit-built metal foil-plated laminated board 8. An exposure hole 5 for making the test pattern 1 exposed; a through-hole 6 penetrating through the ground patterns 2, the metal foils 3, and the insulating layer 4; and conductive paste 7 applied to fill the through-hole 6 so as to electrically connect the ground pattern 2 and the metal foils 3 together; are provided. It is not required to carry out a usual process through which the depth of a connection hole is accurately controlled. COPYRIGHT: (C)2004,JPO |
