Light exposure apparatus for master optical disc
US6208611A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | May 27, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light exposure device for a master optical disc capable of exposing to light a desired area of the master optical disc to high precision for forming crests and recesses of broad widths therein to high precision. Specifically, the light exposure device for the master optical disc exposes to light the portions of a photoresist coated on a substrate of the optical disc adapted to form a pre-set pattern corresponding to recorded information signals. The light exposure device for the master optical disc includes a light-condensing optical element 15 for condensing the laser light radiated from a light source, a deflecting optical element 16 for wobbling the laser light condensed by the light-condensing optical element 15 and an optical system 17 arranged downstream of the focal point position of the light-condensing optical element 15 for re-imaging the laser light wobbled by the deflecting optical element 16 at a location upstream of the objective lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.