Moisture-insensitive holograms and method for making the same
US5331444A · kind A · utility
Inventor
Key dates
| Filing date | May 20, 1991 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | May 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/39
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Reflection holograms to be viewed through the front side of a transparent and preferably flexible substrate, and which are insensitive to moisture in liquid and in vapor form, are produced by attaching a layer of holographic recording material to the back side of a transparent substrate, attaching a layer of moisture barrier resin to the back side of the recording material in sufficient thickness to render the hologram insensitive to moisture, and attaching a layer of opaque material to the back side of the moisture barrier layer. Further protection against moisture may be achieved by attaching a solvent deposited layer of transparent moisture barrier resin to the front side of the substrate and/or attaching a layer of moisture barrier sheet to the back side of the opaque layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.