Apparatus for making video discs
US4407646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1982 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Mar 3, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/811
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for making video discs by moulding from an engraved master which includes depositing on one edge of the master an elongated fillet of a curable resin; photopolymerizable or thermosettable and spreading gradually the resin between the master and a flexible film of a substrate which is applied by means of a pressure roller, the resin being then cured as required by ultra-violet or infrared radiation through the film. The apparatus may also include a mechanisms for piercing the central hole and cutting out the disc. The formation of a succession of discs on the same film may be automatically obtained, the film advancing step by step between each moulding and/or cutting out operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.