Information signal recording medium
US4621007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1985 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Jun 6, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3192
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information signal recording medium comprises a core material made of a non-conductive material, and a surface material made of a conductive material and in close adherence with at least one surface of the core material. Variations in geometrical configuration in accordance with information signals to be recorded on the recording medium are compression molded on the surface material. The materials constituting the surface material and the core material are selected so that a ratio V.sub.C /V.sub.N between a melt viscosity V.sub.C of the surface material and a melt viscosity V.sub.N of the core material at a temperature and a shear rate at the time of the compression molding is less than or approximately equal to 1.6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.