JPH0519846Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a magnetic card, and particularly to a magnetic card having a counterfeit prevention function. (Prior Art) Generally, a magnetic card is constructed by forming a magnetic film for magnetic recording on at least a partial area of a resin substrate, and further forming a protective film over the entire surface of the substrate including the magnetic film. In particular, disposable magnetic cards that can be discarded after use are made up of a magnetic film formed over the entire surface of the card and additionally provided with desired characters or illustrations. This type of magnetic card is used in many fields, such as train tickets, pari-mutuel betting tickets, and telephone cards, and the fields of use tend to expand further. (Problem that the invention aims to solve) By the way, this type of magnetic card has a type that, for example, in the case of coupon tickets or cash coupons, records that show the number of times they have been used can be rewritten or erased sequentially. There is something. However, this type of magnetic card has the disadvantage that it is possible to perform magnetic recording even after it has been used, and that it can be reused, that is, counterfeited, as long as a specified magnetic recording is performed in a specified recording area. ing. The present invention was made in view of these drawbacks, and an object of the present invention is to provide a magnetic card configured such that magnetic recording is not possible after use. (Means for Solving the Problems) The present invention provides a magnetic card in which a magnetic film for magnetic recording is formed on at least a partial area of a substrate, in which a thermally deformable plastic film is provided on the upper or lower surface of the magnetic film. It is characterized by having been provided. (Function) This magnetic card is used in a magnetic recording/reproducing device having a heating means such as a thermal head or a laser beam in the magnetic recording/reproducing section, and at the time of final use, at least a part of the heat deformable plastic film is heated by the heating means. By deforming the area, the magnetic film corresponding to this area is destroyed, making magnetic recording impossible. (Embodiment) The present invention will be described below with reference to an illustrated embodiment. In FIG. 1, reference numeral 1 denotes a card substrate made of polyethylene terephthalate with a thickness of 250 μm.
A heat deformable plastic film 2 (for example, polyester) with a thickness of 12 μm is pasted onto this substrate 1 using an adhesive, and a magnetic film 3 for magnetic recording is placed on top of it.
Form by applying. Furthermore, a protective film 4 is provided on the magnetic film 3.
The total thickness of the magnetic film 3 and protective film 4 is 10 μm. Magnetic recording of predetermined contents is performed on the magnetic film 3 of the magnetic card 10 thus obtained, depending on the purpose of use. On the other hand, as a magnetic recording/reproducing device, one is used which is equipped with a magnetic recording/reproducing unit equipped with a heating means capable of heating at least a partial area of the magnetic card 10 to a predetermined temperature or higher using a thermal head, a laser beam irradiator, or the like. Ru. When the magnetic card 10 is used as a coupon ticket, for example, this heating means is controlled to sequentially heat the number recording area in accordance with the number of times of use each time recording or reproduction is performed. Of course, when used as a magnetic card that can be used only once, the entire surface of the magnetic card 10 may be heated. In this way, in the area of the magnetic card 10 that has been heat-treated to a predetermined temperature or higher by the heating means, only the magnetic film 3 corresponding to the deformed area is destroyed due to the deformation (mainly contraction) of the heat-deformed plastic film 2. be done. As a result, magnetic recording on the destroyed magnetic film 3 becomes impossible. For this reason, the heating area by the heating means is selected and set at a main part where only a part of the magnetic film is destroyed and magnetic recording on the remaining magnetic film becomes invalid. The characteristics of the heat deformable plastic film 2 are shown in the table below.

【table】

[Table] Of course, the heat-deformable plastic film is not limited to the above-mentioned materials, but any material having properties close to those shown in the table above may be used. Furthermore, the thermally deformable plastic film may be provided on the upper surface of the magnetic film 3 instead of on the lower surface of the magnetic film 3 as shown in the drawing. (Effects of the invention) As explained above, the magnetic card according to the invention prevents counterfeiting for the purpose of reuse by being provided with a heat-deformable plastic film that can destroy the magnetic film during final use. This can contribute to improving the crime prevention effect in the distribution industry.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a magnetic card according to the present invention in a partial longitudinal section. In the figure, 1 is a substrate, 2 is a heat deformable plastic film, 3 is a magnetic film, and 4 is a protective film.

Claims (1)

[Scope of utility model registration request] In a magnetic card in which a magnetic film for magnetic recording is formed on at least a partial region of a substrate, and the substrate surface including the magnetic film is covered with a protective film, the protective film is provided between the magnetic film and the substrate. A magnetic card characterized in that a thermally deformable plastic film is interposed between at least one of the magnetic film and the magnetic film.