Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Reexamination Certificate
2001-07-12
2004-06-22
Resan, Stevan A. (Department: 1773)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
C428S692100, C235S493000, C283S082000, C360S002000
Reexamination Certificate
active
06753076
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a forgery-preventive identification medium as well as to a method for ascertaining the genuineness of such an identification medium.
More particularly, the present invention relates to a forgery-preventive identification medium wherein the identification information constituted by the identification elements on the medium is recorded in the magnetic layer of the medium as inerasable recorded information, as well as to a method for ascertaining the genuineness of such an identification medium by reading and comparing the identification information and the inerasable recorded information in the magnetic layer. This identification medium is usable in various applications such as gold note, credit card and the like.
2. Description of the Related Art
Currently, a large amount of important documents are in circulation in society. Such documents include, for example, securities such as bond, merchandise ticket, check, credit card, entrance ticket, passenger ticket, boarding ticket and the like; banknotes; and certificates such as passport, driving license, ticket for registered member and the like.
To prevent the illegal use of such important documents and secure safe transactions in society, it is extremely important to reliably prevent the forgery or alteration of these important documents. Therefore, it is highly needed to prevent the forgery or alteration of the above important documents and secure the safety for such act and the high reliability for the documents.
With an increase in the circulation amount of the important documents, however, the forgery or alteration thereof has increased as well and the damage thereby has reached an immense level.
For prevention of the forgery or alteration of the above important documents, there have been employed various methods using, in combination, (1) visible information (e.g. fine printing formed by a high printing technique), watermark or hologram and (2) a magnetic reading system. These methods can be carried out at a relatively low cost.
Meanwhile, the forgery or alteration of the above important documents has become easier in recent years than before owing to, for example, (a) the development of high printing techniques, (b) the development and spread of personal computers and associated apparatuses and (c) the spread of high-quality copiers. As a result, by utilizing the above apparatuses, the forgery or alteration of important documents, etc. is taking place one after another.
Currently, an identification information technique enabling automatic identification by utilizing optical reading, magnetic reading, etc. is in use in various fields. For example, a bar code system using this technique improved the interface between user and system in information processing. As a result, this technique became usable in many application fields. Simultaneously therewith, illegal acts skillfully utilizing the technique increased. Hence, the situation surrounding the technique is changing greatly.
That is, high safety is needed in the fields using the identification information technique enabling automatic identification. However, illegal acts are increasing in these fields as well.
For example, in the fields using an IC (integrated circuit) card, etc., there are being used IC cards having a security function by employing an information processing technique based on a soft ware or a firm ware. Even in such cards, however, illegal acts are appearing. In fact, IC cards, etc. having a read/write function are considered to basically have a room allowing illegal acts; therefore, it is impossible to completely eliminate the illegal acts.
Nevertheless, techniques for minimizing such illegal acts are under study, as well known.
As one of such techniques for minimization of illegal acts, it was proposed to allow the substrate (e.g. paper or plastic card) constituting an important document to possess unalterable identification information. In using this document, the unalterable identification information is referred with the instrument-readable information (e.g. visible information) possessed by the substrate, whereby any illegal act for the document is prevented.
In this technique, it is essential that the identification information possessed by the important document is unalterable by any illegal act. Further, it is desired that the technique can be carried out at a low cost and allows use of an existing system.
Currently, there is no technique for prevention of illegal act which satisfies all of these requirements.
SUMMARY OF THE INVENTION
In view of the above situation, the present invention aims at providing a forgery-preventive identification medium free from the above problems and a method for ascertaining the genuineness of such an identification medium.
The present invention lies in the followings.
[1] A Forgery-preventive Identification Medium Comprising
a substrate containing identification elements, and
a magnetic layer for magnetic signal recording, formed at the predetermined portion of the substrate,
Wherein the magnetic layer contains at least a MnBi magnetic powder.
[2] A Method for Ascertaining the Genuineness of a Forgery-preventive Identification Medium of Claim
1
Comprising the Steps of:
reading its identification information constituted by the identification elements,
recording the information in the MnBi containing magnetic layer as inerasable recorded information,
reading the identification information and the inerasable recorded information both of the forgery-preventive identification medium, and
comparing the two informations.
The forgery-preventive identification medium of the present invention comprises a substrate containing identification elements and a magnetic layer for recording magnetic signal, formed on the substrate. The magnetic layer contains MnBi and allows substantially no rewrite of information under ordinary conditions. The information of the identification elements is recorded in this magnetic layer and, when the resulting identification medium is used, the information of the identification elements and the information recorded in the magnetic layer are read and compared. Thus, the information recorded in the magnetic layer is substantially unalterable under ordinary conditions. As a result, the forgery-preventive identification medium of the present invention can reliably prevent its forgery or alteration. Further, the present identification medium can use identification elements of various kinds and, therefore, has wide applications and can be ascertained reliably. In an identification medium produced using a magnetic layer used in ordinary magnetic tapes, etc., the magnetic information recorded in the magnetic layer can be easily erased by applying a strong magnetic field to the identification medium. Therefore, such an identification medium can be easily identified as a forgery.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The forgery-preventive identification medium of the present invention comprises a substrate containing identification elements and a magnetic layer for magnetic signal recording, formed at the predetermined portion of the substrate.
The magnetic layer contains a MnBi magnetic powder. The coercive force of the MnBi magnetic powder is as high as about 12,000 Oe at 300 K (27° C.) but is 1,500 Oe or less at 100 K (−173° C.). The magnetic layer is demagnetizable at 100 K. In the magnetic layer after demagnetization, magnetic signal can be recorded at ordinary temperatures using an ordinary recorder. However, the once-recorded signal allows no erasing or alteration at ordinary temperatures at a magnetism possessed by an ordinary recorder.
In the present invention, the identification information constituted by the identification elements contained in the substrate is read and recorded in the MnBi magnetic powder-containing magnetic layer as inerasable recorded information, to obtain a forgery-preventive identification medium of the present invention. In using this identificatio
Lintec Corporation
Norris McLaughlin & Marcus PA
Resan Stevan A.
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