JPS5958630A - Magnetic card - Google Patents

Abstract

PURPOSE:To attain a magnetic card which is prevented from forgery, by laminating a layer in order which includes a pattern consisting of thin films of a metal (oxide), and a layer including glass beads, on a face in the side opposite to a magnetic recording face of a magnetic card to provide a retroreflective plate. CONSTITUTION:A transparent resin layer 8 is formed with a thickness of 0.05- 0.1mm. on a polyester film 9 by printing or applying, and a layer 6 where glass beads 6 having a size of 20-88mu are arranged in one line is formd on the surface of the layer 8. A transparent resin layer 7 similar to the layer 8 is formed on the layer 6 to cover glass beads. A pattern layer 4 consisting of an In2O3 and an SnO2 is vapor-deposited with a thickness of 50-500Angstrom on the layer 7 or a thin film pattern 4 consisting of gold, Al, or the like is formed on the layer 7. Next, a tansparent resin layer 5 covering this pattern 4 is formed. A magnetic recording layer 2 and a printed protection layer 3 are formed in order on a hard plastic sheet 1, and this plastic sheet 1 and the layer 5 are joined to produce a magnetic card. The pattern 4 is too thin to be discriminated with the naked eye. such thickness is given to the pattern 4 that the reflected light is taken out as an electric signal to recognize the pattern 4 in an electrooptic device, thereby preventing forgery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a counterfeit-proof magnetic card using a retroreflective plate for use in road signs.

Magnetic cards include cash cards, credit cards,
Although they are widely used for member's cards, transportation commuter passes and tickets, identification cards, etc., troubles related to cards (theft, forgery, modification, etc.) occur frequently, and measures to prevent these troubles are desired. Among these, counterfeiting is expected to be relatively easy if carried out by someone with specialized knowledge, by decoding the magnetic signal with the current configuration of magnetic cards and recording the same signal on another card.

The present invention has succeeded in making counterfeiting virtually impossible by using a metal or thin metal film pattern and a retroreflective plate on an ordinary m-card to check it with both magnetic recording and optical identification patterns. It is. The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a conventional magnetic card, which has a hard plastic sheet 1, a magnetic recording layer 2, and a printing layer 3 as its main components.

Needless to say, the magnetic recording layer 2 may be provided partially as shown in FIG. 1, or may be provided entirely as in a commuter pass for public transportation.

Figure 2 shows a hard plastic sheet 1 (transparent or opaque) according to the present invention, which has the same structure as the one shown in Figure 1 up to the magnetic recording layer 2 and printing layer 3, but on the opposite side of the magnetic recording layer 2. The main constituent elements are a layer 5 containing a pattern 4 made of a thin film of metal or metal oxide (hereinafter referred to as a pattern layer), on which a layer 7 containing glass beads 6 is further layered. A focal layer 8 and a protective layer 9 may be further laminated thereon.

When manufacturing this, for example, polyester film 9
By printing or painting the transparent resin layer 8 on, ' 0.05
It is provided at a thickness of about 10 to 100 ml and is used as a target layer.

Glass beads 6 having a size of about 20 μm to 88 μm are arranged on the surface of the focal layer by an electrostatic method or the like in a substantially straight line, that is, so that no uneven surface appears on the surface. In this case, a similar transparent resin layer 7 may be formed on the surface of the focal layer 8. Furthermore, if necessary, use transparent colorless or transparent colored ink on this surface,
A protective coating having a thickness of 0.05 nm to 0.1 nm may be formed. For example, a thin film containing indium oxide as a main component (for example, indium oxide/tin oxide = 0.9810.02 to 0.8510.
15 weight ratio) to a film thickness of 50A by vacuum evaporation, sputtering, or ion derating method.
Deposit to a thickness of ~500 Å.

If necessary, a transparent protective coating may be formed on the deposited layer. The product of the present invention is produced by bonding the retroreflector plate on which the indium oxide pattern obtained as described above is vapor-deposited to the surface opposite to the magnetic recording layer of an ordinary magnetic card.

To explain the anti-counterfeiting effect of the product of the present invention, the vapor-deposited thin film of indium oxide has good transparency, and in particular, a thin film with a thickness of 50λ to 50X cannot be seen visually unless you look carefully, but it is visible when compared with the non-vapor-deposited part. In the light region, the reflectance is improved by 3 to 20%. It is also easy to irradiate a light beam onto the Mal pattern on the card using an appropriate electro-optical device, extract the reflected light as an electrical signal, and determine the authenticity of the card. As explained above, the thickness of the deposited film is 50
If it is smaller than X, the reflectance is too small, making it difficult to recognize the pattern, while if the film thickness is greater than 500λ, the reflectance becomes too large, making it easy to recognize the pattern with a fixed eye even without irradiating it with a light beam. This is not desirable because it causes

In addition to magnetic signals, the magnetic card according to the present invention can extract optical signals by depositing a transparent reflective layer, and the pattern cannot be easily recognized with the naked eye. Furthermore, since a pattern is provided in the intermediate layer, even if the pattern can be recognized, counterfeiting is virtually impossible.

Pattern 4 may be any of characters, figures, barcodes, etc., but a barcode is appropriate in view of readability.

Indium oxide is suitable as the metal or metal oxide constituting the pattern 4, but metals such as gold, copper, and metals such as SnO, TiO, ZrO, and CeO may also be used. Can be used.

The layer containing a pattern and the layer containing glass beads include cases where the layer includes only a pattern or only glass beads, and to explain this in the order of the manufacturing method, a thin layer of glass beads is adhered onto the focal layer s, and the glass beads are bonded to the glass beads. The present invention also includes a case in which a pattern made of a thin film of metal or metal oxide is directly provided and the whole is covered with a transparent resin layer, that is, the pattern layer 5 and the glass beads layer 7 are not clearly distinguished.

Furthermore, even if a protective layer 9 or the like is further laminated in addition to the pattern layer and the glass beads layer, this does not impair the effects of the present invention and is included in the present invention.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a conventional magnetic card, which includes: 1, hard plastic sheet 2, magnetic recording layer 3, printing layer and protective layer Fig. 2 is a schematic cross-sectional view of a magnetic card according to the present invention; Plastic layer 2, magnetic recording layer 3, printing layer and protective layer 4, pattern 5, layer containing pattern 6, glass beads 7, layer 8 containing glass beads, focal layer

Claims (1)

[Claims] A magnetic card characterized in that its main component is a layer containing a pattern made of an oxide Q thin film and a layer containing glass beads, which are laminated in sequence.