US 5,856,048 · Granted 1999-01-05
Information-recorded media and methods for reading the information
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.
Patent details
- Publication number
- US 5,856,048
- Filing date
- 1993-07-26
- Grant date
- 1999-01-05
- Assignee
- Dai Nippon Printing Co., Ltd.
- Inventor(s)
- TAHARA; SHIGEHIKO, KUROKAWA; SHINICHI, TAKAHASHI; NORIO, HORIGUCHI; RYUJI, SAKAI; MORITO, HAYAKAWA; AKIRA, KOMAKI; SHINPEI
- CPC class
- B42D25/324
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