Draw type optical recording medium
US5297132A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Jun 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/2571
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The DRAW type optical recording medium which can record optical information by forming information pits in the recording layer by irradiation of an energy beam such as laser beam, and yet can reproduce the information immediately after writing without requiring any step of developing processing after writing of information. The optical recording medium includes a recording layer (3) for forming information pits through the occurrence of physical deformation by irradiation of an energy beam and a sensitizing layer (4) for augmenting the physical deformation in the recording layer (3) laminated on a support (2). By the presence of the sensitizing layer, recording sensitivity is improved and also stability of the medium with lapse of time becomes excellent. Further, due to the presence of the sensitizing layer, the optical recording medium can be a sealed structure and therefore the optical recording medium is lightweight and flexible, and can be made in various forms such as card, sheet, a flexible sheet, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.