| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-piece wiring board which is excellent in the mechanical strength and reliability of a ceramic motherboard without no cracking at the tip end of a division groove. SOLUTION: In the multi-piece wiring board, division grooves 2 having a depth corresponding to 10-30% of the thickness of the ceramic motherboard 1 and having an opening angle d of 30-60°are made in at least one of upper and lower surfaces of the ceramic motherboard 1 having rectangular wiring board regions 4 arranged vertically and horizontally, along boundaries of the board regions 4. Even when the ceramic motherboard 1 is thin, the grooves 2 having such a depth that the ceramic motherboard 1 can be separated easily and positively into the individual board regions 4 can be made. Further, the ceramic motherboard 1 can be effectively avoided from undesirably being cracked or broken. COPYRIGHT: (C)2004,JPO&NCIPI
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