Data storage medium having reflective particulate silver layer
US4269917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1980 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | Jul 14, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31685
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reflective laser recording and data storage medium, for direct reading after writing, formed from a photosensitive silver-halide emulsion wherein a surface latent image exposure on the recording area forms a depthwise gradient of silver nuclei. A single step negative silver diffusion transfer process is used to develop silver nuclei of the latent image and dissolve unexposed silver halide elsewhere, forming silver ion complexes. These complexes are transported by diffusion transfer to the developing silver nuclei sites where silver is precipitated and adsorbed to form a high concentration of non-filamentary particles at a surface of a low melting temperature dielectric colloid matrix which is highly reflective of light and electrically non-conducting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.