Control of flux by ink stop line in chip joining
US6904673B1 · kind B1 · utility
1Cited by
13References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2002 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Jan 1, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49171
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Ink jet printing apparatus is employed to form a non-polar ink stop line around a chip site on the polar surface of an organic laminate substrate. The non-polar ink stop line acts to confine polar liquid flux from spreading after application of the flux to the chip site prior to chip joining. Excessive flux spreading results in insufficient flux being present at the chip site for the formation of good electrical connections during solder reflow upon chip joining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.