Method of making a master disk used in making optical readable information disks
US4861699A · kind A · utility
12Cited by
17References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1985 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Nov 26, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing an optical master disk, matrix derived from the master disk and synthetic resin information disk derived from the matrix. A method of manufacturing an optical master disk in which a supporting plate is provided on one side with at least two layers of a photosensitive material in which, taken from the supporting plate, the photosensitivity of the material of the layers increases and/or in which a light-absorbing separation layer is used between the layers, as well as a metal matrix derived from the master disk and an optically readable information disk of synthetic resin derived from the matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.