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| Annular ring whether to increase the width of the finished product can be more effectively controlled aperture Tolerance? |
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Basically the concept is not wrong, we can discuss the following aspects:
1, the high current region or some independent holes, when PAD increased, it can reduce the current density, the natural thickness of the copper can reduce the difference with the other bore hole.
2, because the aperture ring is large, in HASL manufacturing process, but also can reduce the amount of residual solder the hole, and the effective control of the finished aperture
For reprint, please indicate by www.pcba.co
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