Optical recording medium and method of manufacturing the same
US6889381B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2001 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Oct 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10582
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is provided an optical recording medium, in which a light transmitting layer is formed on a disc substrate, having less deflection and being excellent in recording/reproducing properties. In an optical disc, an information signal area on which an information signal can be recorded and/or reproduced is formed on a major surface of a disc substrate thereof; a light transmitting layer which can transmit a laser beam used in a process for recording and/or reproducing the information signal is formed on a side on which the information signal area is present; and a clamp reference plane is arranged on a major surface of the light transmitting layer in a clamp region. If the optical disc is clamped by a chucking unit of a drive, it is clamped by making the clamp reference plane on the major surface of the light transmitting layer contact with a mounting surface of a table for mounting the disc, and making a magnetic metal plate contact with the major surface of the disc substrate, and then sandwiching the optical disc between.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.