Process for producing information carrying discs
US4157931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1978 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Jul 18, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2017/003
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The process according to the invention uses a matrix engraved by any means, the tracks being perfectly centered on this matrix in relation to a center of rotation. The matrix is placed in a vacuum chamber on a supporting axis capable of rotating and is coated over its entire surface with a polymerizable material which is free from air bubbles and which does not adhere to the constituent material of the matrix. A substrate previously drilled at its center, balanced and coated with a material to which the polymerizable material adheres, is placed on the supporting shaft and held at a distance from the matrix. The vacuum is established in the chamber and the substrate is brought into contact with the matrix. On completion of polymerization outside or inside the chamber, the substrate carrying the moulded resin is readily separated from the matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.