Optical information recording medium and optical information recording/reproduction apparatus
US6941572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2002 |
| Grant date | Sep 6, 2005 |
| Priority date | — |
| Expiry date | May 11, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
It is an object to provide an optical information recording medium including a substrate (1) and an optical information layer in one of the layers the substrate (1) and having a light incident surface on at least one of the surfaces of the substrate side and the opposite side. The optical information recording medium also includes a magnetic clamp layer (2) at a position not disturbing the incident light into the optical information layer from the light incident surface and covering optical information layer partially or entirely. The magnetic clamp layer (2) is pulled by and fixed to the magnet of an optical information recording/reproduction apparatus. The pulling force between the clamp layer and the magnet is preferably in a range from 0.1 N to 5 N. Thus, it is possible to provide an optical information recording medium and an optical information recording/reproduction apparatus in which recording/reproduction can be performed up to the vicinity of the center of the substrate (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.