Transfer molding apparatus with a cull-block having protrusion
US6106259A · kind A · utility
21Cited by
4References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1998 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Sep 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/48247
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A transfer molding apparatus with a specially designed cull-block can prevent the occurrence of defective molding caused by the air trapped inside the mold body. This cull-block has a cylindrical protrusion at the center of the cull-block and a circular sunken part along the perimeter of the protrusion. This new design prevents the air remaining behind the front of the fluid molding compound during molding process and finally, promotes the production of semiconductor device package free from molding defects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.