Gas mixture for use in control and formation of ball bonds
US4889274A · kind A · utility
8Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Mar 22, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/00014
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to the use of metastable state of mixed gases which, when appropriately mixed, provide better control of current and voltage conditions and subsequent arc formation properties in making balls of aluminum, copper and gold with an electronic flame-off method. The specific mixtures involve inert argon mixed with small amounts of hydrogen and neon. Exceptionally well controlled balls of uniform size result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.