| 摘要 |
PROBLEM TO BE SOLVED: To provide a press-fit-pin support structure of a printed board which can improve reliability by preventing the destruction of a continuity hole of its build-up portion having low mechanical strength. SOLUTION: A printed board comprises a core base material portion 2 formed of a material, wherein a base material such as glass cloth is impregnated with resin and a build-up portion 3 formed only of a resin and having a low mechanical strength. In the core base material portion 2 and the build-up portion 3, a core-base material portion hole 5 and a build-up portion hole 6 are formed respectively, and after applying metal platings 7 to these holes 5, 6, their electrical continuities are formed to change them respectively into a core-base material portion continuity-hole 8 and a build-up portion continuity hole 9. In these holes 8, 9, electric conduction is secured, and a diameter c of the hole 8 is made smaller than a diameter d of the hole 9.
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