Post-exposure dye treatment in the production of holograms
US4966440A · kind A · utility
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11References
2Claims
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Key dates
| Filing date | Mar 22, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Mar 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hologram which comprises a light transparent base having coated thereon a hydrophilic water-swellable layer which contains the holographic image and a dye whose peak absorption is below the peak replay wavelength of the hologram. The hologram is produced by adding the dye after exposure of the hologram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.