Method for making optically readable media containing embossed information
US5552009A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Apr 10, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for making an optically readable medium containing a relief information track comprising the sequential steps of (a) laminating a dry photohardenable film to a surface of a transparent dimensionally stable substrate; (b) embossing the exposed surface of the photohardenable film with the relief information track by applying thereto under pressure a stamper die containing a reverse relief image of the information track; (c) passing actinic radiation through the transparent substrate and the photohardenable film to effect hardening of the photohardenable film while it is contact with the stamper die; and (d) separating the stamper die from the embossed photohardened film; The embossed film of the medium is made reflective by applying a reflective layer to either the photohardenable film prior to embossing or to the photohardened film subsequent to embossing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.