Recording medium of flat surface with resin filled ring grove
US5345436A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Jan 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a disc having an information signal surface on which a replica of information signals is formed by a stamper provided in a metal mold, and a manufacturing method of the disc. The disc includes a disc substrate having a generally flat surface on which the replica of the information signal is formed, a center through hole formed at a center thereof and a ring groove inevitably formed as an inverted replica by a shape of a collar of a retainer which is provided in the metal mold to support the stamper. The ring groove concentrically divides the generally flat surface into inner and outer surfaces. A reflecting layer is provided on the generally flat surface for reflecting reading light from a reproducing apparatus. Further, a protecting layer is provided on the reflecting layer for protecting the reflecting layer. Resin is filled in the ring groove for causing the inner and the outer flat surface to be bridged and flush each other for printing a label at a desired area of the inner and the outer surfaces without being interrupted by the ring groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.