Method and apparatus for thermal process control in the electroforming of stampers for production of CD/LD data carriers
US5833828A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1997 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and an apparatus for thermal process control in electroforming stampers for the production of CD/LD data carriers or the like. The temperature of an electrolytic solution in an electroforming cell is maintained at a value nearest a specific maximum temperature by raising or lowering the temperature of the electrolytic solution in a storage tank provided outside of the electroforming cell as a function of the temperature measured in a cathode space of the electroforming cell. A temperature sensor is disposed in or near the cathode space adjacent an electrolyte injection nozzle in a space between the anode and cathode means for supplying signals to a control unit. The temperature sensor and the injection nozzle are preferably assembled into a single mounting unit. The electroforming process can thus be run with an optimum effectivity in the vicinity of a maximum permissible temperature of the electrolytic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.