Variable mask and universal vacuum drum
US5865433A · kind A · utility
16Cited by
28References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Jun 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0882
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A vacuum drum apparatus on which a mask is mounted having a resilient surface and an array of holes suitable for a substrate of a given size. The drum is a circular cylinder perforated with an array of holes. A hollow chamber within the drum is connected to a controlled pressure source for providing a vacuum. The mask may be magnetically attracted about the outer surface of the drum. Thus, the mask may be made of a flexible ferromagnetic sheet. The mask is preferably elastomeric and may include an inextensible layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.