| 摘要 |
PROBLEM TO BE SOLVED: To resolve complexity which imposes restrictions on design elements at making decision about the number of notches or through-holes formed on the border between a motherboard and a separable board, length, arrangement or other design elements even though damages to at least the motherboard can be prevented, when the motherboard and the separable board are separated. SOLUTION: Three fiber woven textiles for a printed wiring board 1 are twilled, and longitudinal fibers (or lateral fibers) constituting the fiber woven textiles are arranged approximately in parallel with a border Z. Furthermore, the ratio between the short diameter and the long diameter of the cross section of the longitudinal fibers, the lateral fibers is set at 0.09, and the longitudinal fibers and the lateral fibers are composed of glass fibers and ceramic fibers. Accordingly, damages to the motherboard 2 and the separable board 102 is prevented, when the motherboard and the separable board are separated.
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