Thermoplastic optical recording medium using IR wave length
US4053872A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1975 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Dec 8, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G16/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for and a method of recording or writing optical data into a thermoplastic layer is disclosed. The apparatus includes a layer of photoconductive material that is photoconductively responsive to a data containing light beam having a wave length below the infrared (IR) range and a layer of thermoplastic material that is thermoplastically responsive to a light beam having a wave length within the IR range. In practicing the method of the present invention, the electrically charged apparatus is exposed to a data-bearing light beam having a wave length below the IR range for selectively exposing, i.e., electrically charging, the photoconductive layer. Next, the apparatus is exposed to a light beam having a wave length within the IR range for heating the thermoplastic film and thermally permitting the selective electric charge in the photoconductive layer to distort the surface of the thermoplastic layer, and, accordingly, writing into the thermoplastic layer the optical data that was contained within the data-bearing light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.