Stamper for producing recording medium
US5756130A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 17, 1994 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | May 17, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1259
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided a stamper for producing a recording medium exhibiting excellent durability and capable of stably forming projections and pits and a method of producing the stamper. A stamper for producing a recording medium comprising projections and pits in a predetermined pattern on the surface thereof, wherein a value of tan .theta..sup.-1 obtainable from an enlargement angle .theta. of an output from a cartridge with respect to an enlargement of an output denoting a load measured by a test of scratching the surface having the projections and pits under conditions that a diameter of a stylus is 100 .mu.m and a loading speed of 1 .mu.m/second is 1.3 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.