Multiple anode plasma for CVD in a hollow article
US10297425B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2014 |
| Grant date | May 21, 2019 |
| Priority date | — |
| Expiry date | Aug 6, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/13
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for plasma enhanced chemical vapor deposition to an interior region of a hollow, tubular, high aspect ratio workpiece are disclosed. A plurality of anodes are disposed in axially spaced apart arrangement, to the interior of the workpiece. A process gas is introduced into the region. A respective individualized DC or pulsed DC bias is applied to each of the anodes. The bias excites the process gas into a plasma. The workpiece is biased in a hollow cathode arrangement. Pressure is controlled in the interior region to maintain the plasma. An elongated support tube arranges the anodes, and receives a process gas tube. A current splitter provides a respective selected proportion of a total current to each anode. One or more notch diffusers or chamber diffusers may diffuse the process gas or a plasma moderating gas. Plasma impedance and distribution may be controlled using various means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.