Master disk for optical disk and having first and second photoresist layers
US6219330A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1998 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Jun 11, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31645
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A master disk used for manufacturing an optical disk on which information is recorded, and a method of manufacturing the same. First and second photoresist layers are sequentially disposed on a substrate and the first photoresist layer is less sensitive to exposure to a laser beam having a predetermined wavelength than the second photoresist layer. The master disk is manufactured by selectively exposing and etching the first and second photoresist layers, so that the boundaries between grooves and information pits recessed from the grooves become distinct and the grooves and information pits have inner walls substantially perpendicular to the substrate. Therefore, the reproduction characteristics of an optical disk obtained from the master disk are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.