| 摘要 |
PROBLEM TO BE SOLVED: To provide a printed circuit board in which electric components are fixed and connected by lead-free solder from which lead components are removed. SOLUTION: A printed circuit board is provided with a base plate provided with a plurality of installation holes in such a manner that the connection pins of electric components are threaded with the extended connection pins for connection. Between the installation hole and the connection pin, there is a clearance of only a predetermined distance, so that molten lead-free solder flows sufficiently. Consequently, soldering of the electric components by the lead-free solder can be stably performed. COPYRIGHT: (C)2006,JPO&NCIPI
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