Method and apparatus for punching a thin metal tape to provide a lead frame for a semiconductor device
US5979277A · kind A · utility
6Cited by
9References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1996 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Feb 1, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/8831
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A stripper holder for holding a stripper plate conforms with the deformation of a die plate. A pressing force applied to the stripper plate and is greater than an elastic limit of a metal tape to be punched, and less than a pressing deformation or breakage force of the metal tape. The stripper holder may also be flexible, or such that the metal tape is pressed at two different positions for one punching position by two different pressing forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.