1. Anne - line width and spacing is 15 mil traces on 25 mil centers. We have a different supplier for our multi-layer boards who also uses Camtek inspection stations. They have no problem with the annular ring. I did ask them for input on our "other" supplier problems and they suggested that the design rules needed to be changed. They also said the quality of the camera would influence the results. Maybe this is part of the issue. This vendor also uses LPI for our multi-layer boards.
2. Ed - yes, the finished hole size is .038. I know the potential for pad break out is high but we have never had break out issues on these boards.
3. Franklin - you make a good point about whether AOI is worth it on older boards and, Yu-Shan, I did not know that AOI is usually reserved for inner layers. The reason we requested AOI and LPI is that we have had some quality issues with this supplier and see these as a way to help eliminate the problems. We have a good relationship with this supplier and really are looking to improve the quality of our bare boards as well as improving the assembly process in our own facility. This supplier is hand screening our boards and doing visual inspection. We are seeing things like blown tracks, shorted tracks, poor drilling, debris in holes, and sometimes dusty boards. This doesn't happen a lot but we need to prevent it. It's hard for me to talk to our assemblers about quality when we accept defective boards. Unfortunately, I have no clout with respect to incoming inspection on boards. I would like to work this out with the vendor. I'm sure they have some valid points but I think we do, also. Yes, I agree that partnership is important and we will be meeting with them next month to discuss all of this.
Any additional comments would be welcome!
Sue James
Taylor Company
(815) 624-5444
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