Optical recording medium, reproducing apparatus, and recording and reproducing apparatus therefor
US6515956B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Jul 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/24624
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium having a laminated structure portion(4) including a light-emission layer(3) and a recording layer(2). The light-emission layer(3) is made of a light-emission material excited by reproducing laser light to emit fluorescent light, and the recording layer(2) is made of a material in which at least a refractive index or an absorption coefficient can be changed relative to light emitted from the light-emission layer by recording laser light. The recording layer(2) is disposed to be closer to a side into which reproducing laser light is introduced than the light-emission layer(3). Then, recorded information recorded on the recording layer by the change of the refractive index or the absorption coefficient is read out from the recording layer as the change of intensity of light emitted from the light-emission layer(3) when it is irradiated with reproducing laser light. This optical recording medium can realize an optical memory which can generate a reproduced signal with a high S/N.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.