Memory card recording/reproducing with two light sources and a light value matrix
US6205106A · kind A · utility
Inventor
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method of storing and retrieving information by exposing cells of a storage medium to a first beam of light having a first set of properties affecting the optical properties of said storage medium, and by exposing a plurality of individual cells, forming a page of information, of said storage medium to a second beam of light having a second set of properties. A third light beam from said storage medium forms an image of said page on a detecting means. The detected light image is converted into electric data signals, each bit of said data signals corresponding to a cell of said storage medium. The first beam of light is generated by a first light source and there is provided an electrooptical means having an electric input for receiving data and being arranged for modulating said first light beam in dependance of said data. The storage medium comprises a plurality of pages, each page having a plurality of individual cells, and optical properties of said individual cells of said storage medium being changed by said first light beam to correspond to said data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.