Method and apparatus for making a stamping master for video disk replication
US4615969A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1984 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a new and improved method for making a stamping master for video disk replication wherein a film of material which is reversibly convertible between two stable states, one having a high electrical conductivity and the other having a low electrical conductivity, is deposited on a substrate while in one of the states. The material is then imaged with information in coded form by converting selected areas of the film to the other state in a predetermined pattern corresponding to the coded information. The conversion can be accomplished by light, electromagnetic energy or heat. At this stage, an intermediate subassembly, composed of the imaged film on the substrate, is formed which can be read for accuracy by detecting the state of the selectively converted areas with respect to the rest of the film. Corrections can be made by converting the state of selected areas of the film as required. A metal, such as nickel, is then electroplated onto the areas of the film which are in the high conductivity state. The plating is continued until the nickel spans the areas of the film on which it did not directly plate. In this way a continuous backing layer which is integral wit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.