Method for replicating holographic optical elements
US5279689A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Feb 14, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for making an optical image element having a high aspect ratio relief hologram comprising the sequential steps of PA1 (a) applying a dry photohardenable film to a surface of a transparent dimensionally stable substrate; PA1 (b) embossing the exposed surface of the photohardenable film with the holographic image by applying thereto under pressure a stamper containing a reverse relief image of the hologram having an aspect ratio of at least 3:1; PA1 (c) passing actinic radiation through the transparent substrate and the photohardenable film to effect hardening of the photohardenable film while it is in contact with the stamper; and PA1 (d) separating the stamper die from the embossed photohardened film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.