发明授权
US5373985A Upward soldering method 失效
向上焊接方式

Upward soldering method
摘要:
A printed wiring board having an electronic component mounted thereon is disposed with a land of pattern directed downward, and the land and a lead terminal of the electronic component are irradiated with a light beam emitted upwardly and supplied with a solder forwarded upwardly.
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