Packaging structure for a solid-state imaging device with selectively aluminium coated leads
US5223746A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 10, 1992 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Mar 10, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/181
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A packaging structure is provided which is especially useful for solid-state imaging devices and other semiconductor devices. An Al film is selectively formed on inner lead portions and portions of positioning reference plates located within a ceramic packaging body. On the other hand, the outer lead portions that are exposed outside the packaging body are coated with Sn plating layer. Particular care is taken not to locate the Sn plating layer over the Al film. Contamination faults due to Sn swelling and stripping are prevented, while bonding strength of the Al clad inner lead portions with Al internal fine wires and with fit glass joining the ceramic packaging body together is kept high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.