
US Patent No: 5,856,048
Number of patents in Portfolio can not be more than 2000
Information-recorded media and methods for reading the information
Stats
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Jan 5, 1999
Issued date -
Jul 26, 1993
filing date -
08/097,765
serial no -
In Force
status
Importance
Abstract
The invention is directed to an information-recorded medium with easily selectable and identifiable items of information, which is virtually protected against forgery and has enhanced security against some improper use, and a method for reading such a medium. This information-recorded medium 1 includes a substrate 2 and a layer 3 with information recorded thereon by the printing of infrared absorbing ink, said layer 3 being provided on the surface of the layer 2. The printed layer 3 is provided thereon with a relief hologram-recorded layer 7 through an adhesive layer 4, said hologram-recorded layer 7 being built up of a reflecting layer 5 transparent to the infrared region and a relief hologram-formed layer 6 provided on the surface of the reflecting layer 5. For reading, the hologram-recorded layer 7 is reconstructed by visible light, while the printed layer is reconstructed by infrared light, and the medium 1 is identified on the basis of the thus reconstructed information.
First Claim
Related Publications
International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,856,857 Transparent reflection-type | 233 | 1988 | |
| 5,138,604 Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it | 95 | 1989 | |
| 5,297,132 Draw type optical recording medium | 30 | 1992 | |
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| 4,959,283 Dry film process for altering wavelength response of holograms | 29 | 1989 | |
| 5,182,180 Dry film process for altering the wavelength of response of holograms | 58 | 1991 | |
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| 5,145,212 Non-continuous holograms, methods of making them and articles incorporating them | 80 | 1988 | |
| 5,142,383 Holograms with discontinuous metallization including alpha-numeric shapes | 161 | 1991 | |
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| 5,351,142 Semi-transparent reflective layer for a phase hologram | 62 | 1993 | |
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| 5,401,346 Laminated hologram decals for identification cards and the like | 5 | 1994 | |
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| 5,310,222 Optical device | 54 | 1992 | |
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| 4,234,214 Document carrying a legible code, and method and apparatus for producing same | 35 | 1978 | |
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| 4,269,473 Identification card with a hologram and a process for the production thereof | 41 | 1979 | |
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| 5,037,101 Hologram game card | 13 | 1990 | |
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| 5,056,880 Holographic wallpaper | 9 | 1990 | |
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| 4,411,489 System for synthesizing strip-multiplexed holograms | 40 | 1980 | |
| 4,913,990 Method of tuning a volume phase recording | 25 | 1987 | |