JPH07152886A - Magnetic card with bar code - Google Patents

Abstract

PURPOSE:To provide a magnetic card for which forgery prevention and the secrecy of recording information are improved by combining and providing a bar-shaped magnetic layer for outputting one signal in one detection level and the bar-shaped magnetic layer for outputting the signals by at least more than two detection levels for which the applied thicknesses of the respective bar-shaped magnetic.layers of a bar code are different. CONSTITUTION:Since the applied widths of the bar-shaped magnetic layers 2a, 2b and 2c are 50mum or 100mum, the ratio of the applied width and the applied thickness is at least more than 10-fold. The bar-shaped magnetic layers 2a-2c for forming the bar code are printed by offset printing and a protective layer 5 using a coating material same as a magnetic recording layer 6 and the bar-shaped magnetic layers 2a-2c is applied on an upper surface where the bar code is formed with the thickness of 5mum or 8mum with the magnetic recording layer 6 as a reference. Then, the output of the bar code is detected since the detection levels are different for the signals of the two or three kinds of the detection levels from one magnetic recording layer 6 and the mechanism of the forgery prevention which is more complicated than before is built in by the combination of the bar-shaped magnetic layers 2a-2c with the different applied thicknesses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card with a bar code for the purpose of preventing forgery.

[0002]

2. Description of the Related Art In recent years, magnetic cards have come to be used as prepaid cards in various fields, and in order to make magnetic cards with higher security, it is possible to identify forgery in magnetic recording signals recorded on magnetic cards. A magnetic bar code is recorded on a part of the magnetic recording surface while the information for recording is recorded and the information is not erased. The magnetic bar code is used as a magnetic output and is read by a reading device to identify the authenticity. In the conventional bar code using magnetic recording,
The rod-shaped magnetic layer is printed by arranging the rod-shaped magnetic layer at different intervals or the number of rod-shaped magnetic layers in the running direction of the magnetic card, or the rod-shaped non-magnetic layer is printed on the magnetic recording surface by changing the gap or the number of rod-shaped non-magnetic layers. The magnetic signal was read by the head, the number and intervals of the rod-shaped magnetic layer or the rod-shaped non-magnetic layer were determined from the running speed of the magnetic card and the printing interval of the rod-shaped recording layer, and the authenticity was identified.
Since various information is written in a magnetic bar code provided in a conventional magnetic card, the number of rod-shaped magnetic layers or rod-shaped non-magnetic layers recorded on one magnetic card increases, and a bar-shaped bar code is formed. It is easy to detect the number of barcodes because the gap between the magnetic layer and the rod-shaped non-magnetic layer becomes narrower.However, the number of barcodes, that is, the barcode is used to identify the rod-shaped magnetic layer or the distance between the rod-shaped magnetic layers. When the amount of information taken in is large, it is necessary to improve the mechanical accuracy of printing of the rod-shaped magnetic layer or the rod-shaped non-magnetic layer and the detection accuracy of signals for identification, which is a limitation.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a magnetic card with a bar code in which the confidentiality of information is improved. Therefore, the bar code is formed on the same surface as the magnetic recording surface of the magnetic card by a bar-shaped magnetic layer. , Bar-shaped magnetic recording layers having different coating thicknesses, that is, different magnetic moments are provided in combination to dramatically increase the amount of information obtained from a magnetic bar code recorded in a limited length and to provide a highly reliable bar. There is a magnetic card with a cord.

[0004]

According to the present invention, rod-shaped magnetic layers forming bar codes are formed into rod-shaped magnetic layers having different coating thicknesses or different coating thicknesses, and the rod-shaped magnetic layers have different magnetic moments. And the bar-shaped magnetic layer has a coercive force value of 2000 Oersted or 30 in the magnetic recording layer.
Using a large magnetic material having a coercive force of 5000 Oersted or 8000 Oersted with respect to 00 Oersted, the magnetic bar code information can be erased even if an erroneous operation is performed when the magnetic card is inserted into the magnetic card reader. The magnetic card with a bar code uses a bar-shaped magnetic layer made of a magnetic material having a large coercive force value such as a samarium-cobalt magnet.

That is, the present invention relates to a magnetic card with a bar code in which a bar code composed of a bar-shaped magnetic layer is provided on the base film of a support along the end face of the magnetic card in the running direction of the magnetic recording layer and the magnetic card. A bar-shaped magnetic layer that outputs a single signal at one detection level, and a bar-shaped magnetic layer that outputs a signal according to at least two or more detection levels. A magnetic card with a bar code, characterized in that

[0006]

The bar-shaped magnetic layer forming the bar code has a different coating thickness depending on the position of the bar code, and the detection voltage level for detecting the output of the magnetic head for detecting the bar code output is set to, for example, two types. Detect the magnetic layer. By doing so, for example, when the output of the low detection voltage level is 100, the output of the detection voltage level which outputs two signals from one rod-shaped magnetic layer can be recorded up to 50, and a total of 150 bars can be recorded. When the code “corresponding to” “none” of the output of one rod-shaped magnetic layer corresponds to “1” and “0” as a code, the amount of information is 2 ¹⁵⁰ , and the information of 2 ¹⁰⁰ of output of a low detection voltage level is obtained. And the information of 2 ⁵⁰ , which is the output of the detection voltage level for outputting two signals, may be separately used, or the two signals may be used as a product.

Further, a bar code having a rod-shaped magnetic layer which outputs three signals with one rod-shaped magnetic layer as the detection voltage level of the magnetic head may be used. Therefore, the barcode of the present invention can increase the amount of recorded information even if the distance between the rod-shaped magnetic layers is wide.

On the other hand, so-called 2-17 series samarium-cobalt magnet powder is used as the magnetic material forming the rod-shaped magnetic layer of the present invention, and dispersed in the same acrylic resin coating material as the magnetic recording medium forming the magnetic recording layer. And apply it to the magnetic recording layer. The coercive force of 2-17 samarium-cobalt magnet is 5
000 Oersted to 8000 Oersted,
Therefore, the once magnetized rod-shaped magnetic layer is demagnetized by the magnetic head for recording information on the magnetic recording layer, so that the recording of the bar code composed of the rod-shaped magnetic layer is not lost and the signal level does not change.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a magnetic card with a barcode according to the present invention (hereinafter,
In a plan view of the magnetic recording surface 3 side of a magnetic card), a bar code composed of a bar-shaped magnetic layer 2 parallel to the conveyance direction A of the magnetic card 1 and close to the side edge of the coating surface of the magnetic recording surface 3 of the magnetic card 1 . Is recorded.

FIG. 2 is a sectional view showing a part of the magnetic card when it is cut in the central direction B of the bar code forming portion composed of the rod-shaped magnetic layer 2 shown in FIG. 1, but polyethylene terephthalate ( The thickness of the base film 4 made of PET) is about 10 μm, and the coercive force value dispersed in the acrylic resin is 2000 oersted or 3
A magnetic recording layer 6 in which 000 oersted barium ferrite magnets are dispersed is applied to form the magnetic recording surface 3 of FIG. 1, and the recorded magnetic recording signal is reproduced by the magnetic head.

In the present invention, a bar code composed of a bar-shaped magnetic layer is applied to the upper surface of the magnetic recording layer 6, and the thickness of the bar code depends on the position of application, as shown in FIG.
Rod-shaped magnetic layers 2a, 2b, 2c having different coating thicknesses are formed. The magnetic material forming the bar-shaped magnetic layer forming the bar code has a coercive force larger than that of the barium ferrite magnet used in the magnetic recording layer 6, and can be formed into a fine powder without deteriorating the magnetism. A -17 series samarium cobalt magnet is used. The 2-17 series samarium cobalt magnet is an ingot made from a raw material, and then subjected to a solution treatment by holding it at 1200 ° C for 10 hours or more, and then at 800 ° C for 3 hours. After the above aging treatment, the particle size is 1 in an inert gas.
A magnetic coating material for forming a rod-shaped magnetic layer is prepared by mixing fine powder pulverized to less than or equal to μm with an acrylic resin coating material.

When the bar-shaped magnetic layer 2 serving as a bar code is formed on the upper surface of the magnetic recording layer 6, the bar-shaped magnetic layer 2a having the minimum thickness has a coating thickness of 1.5 μm to 2 μm, and the bar-shaped magnetic layer having the second thickness. The coating thickness of 2b is 1.25 of the height of the rod-shaped magnetic layer having the minimum thickness.
5 to 2 times, that is, the minimum thickness of the rod-shaped magnetic layer is 2
When it is μm, it may be 3 μm. The rod-shaped magnetic layer 2c having the third thickness is 1.5 to 2 times the coating thickness of the rod-shaped magnetic layer having the second thickness, and when it is 3 μm, the coating thickness may be 5 μm. The residual magnetic flux density of the 2-17 series samarium-cobalt magnet, which is the magnetic material used for the rod-shaped magnetic layer, is about 3 as compared with the barium ferrite magnet forming the magnetic recording layer 6.
The output of the magnetic head is about twice as high, and a large output signal can be detected even if the coating thickness of the rod-shaped magnetic layer is thin.

The coating thickness of the magnetic recording layers 2a, 2b, 2c shown in FIG. 2 is exaggerated for the sake of clarity. The coating width of the rod-shaped magnetic layers 2a, 2b, 2c is 50.
Since the thickness is from 100 μm to 100 μm, the ratio of the coating width to the coating thickness is at least 10 times or more. The bar-shaped magnetic layer forming the bar code is printed by offset printing. The bar-shaped magnetic layer forming the bar code and the upper surface on which the bar code is formed are coated with a protective layer 5 using the same paint as that of the magnetic recording layer or the bar-shaped magnetic layer. Apply to thickness. By adding a colored pigment to the paint of the protective layer 5 applied to the upper surface of the magnetic recording layer 6 and the barcode, the barcode pattern can be made invisible.

A bar code consisting of a bar-shaped magnetic layer formed by applying powder of a 2-17 series samarium cobalt magnet is an area that covers the surface of the magnetic recording surface on which the bar code is printed, and the gap between the magnetic poles is the thickness of the magnetic card. With an electromagnet having a moderate magnetic pole, a bar code consisting of a rod-shaped magnetic layer is formed in the gap between the magnetic poles of the electromagnet by generating a pulse magnetic field of 15K oersted or more, and magnetized easily, and the magnetic field is rod-shaped. Although it is in the thickness direction of the magnetic layer, since the ratio of the coating thickness to the coating width of the rod-shaped magnetic layer is 10 times or more, the rod-shaped magnetic layer has shape anisotropy, and the magnetization direction is the plane direction. Further, the magnetization is performed in the same direction.

FIG. 3 shows the output from the magnetic head when the magnetic card 1 is carried and the output is read by the magnetic head with respect to the rod-shaped magnetic layers 2a, 2b and 2c formed on the magnetic card shown in FIG. Waveforms and waveform shaping are shown. In the magnetic card with a bar code of the present invention, the coating thickness of the bar-shaped magnetic layer forming the bar code is different, and the magnetic moment of each bar-shaped magnetic layer is different. Therefore, the thicker the coating film, the more the output of the magnetic head becomes. growing.

By setting the detection voltage levels of the magnetic head output to Xa, Ya, and Za with respect to the output of the magnetic head of FIG. 3A, the output signal of the magnetic head of FIG. Molding output X corresponding to the detection level of Xa shown in FIG.
Three types of output are obtained, the shaping output Zb corresponding to the detection levels of b and Ya, and the shaping output Zb corresponding to the detection level of Za.

Therefore, in the magnetic card with the bar code of the present invention, the conventional bar code can detect only the Xb output by the signal detecting device, but the bar code output according to the present invention is two kinds from one magnetic recording layer. Alternatively, since signals of three types of detection levels can be detected by making the detection levels different, it is possible to obtain a larger amount of information than the number of rod-shaped magnetic layers forming a bar code, and different detection levels. The combination of outputs, that is, the combination of rod-shaped magnetic layers having different coating thicknesses makes a bar code-attached magnetic card in which a more complicated anti-counterfeiting mechanism can be incorporated.

The magnetic material of the bar-shaped magnetic layer forming the bar code of the magnetic card with bar code according to the present invention includes:
Although an example using a 2-17 series samarium cobalt magnet is shown, it is not necessary to limit to a 2-17 series samarium cobalt magnet, and a coercive force used for the magnetic recording layer is better than that of a barium ferrite magnet having a coercive force of 2000 Oersted or 3000 Oersted. As a matter of course, the barium ferrite magnet having a large magnetic force or another rare earth magnet can be used. When the magnetic head for recording / reproducing a signal on / from the magnetic recording layer does not cause demagnetization of the rod-shaped magnetic layer even if the magnetic card is mistakenly inserted, the magnetic material of the rod-shaped non-magnetic layer has the same ferrite as the magnetic recording surface. Magnet powder may be used.

[0019]

The magnetic card with a bar code according to the present invention can obtain a large amount of information even if the number of bar-shaped magnetic layers forming the bar code is small. Also, obtain signals with different detection levels read by the magnetic head,
Since it is possible to perform signal processing by combining a plurality of detection levels with one signal, it is possible to obtain a magnetic card with a bar code which is excellent in forgery prevention and confidentiality of recorded information by combining signal processing.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic card recording surface side of a magnetic card with a barcode according to the present invention.

FIG. 2 is a cross-sectional view of a bar code printed portion of the magnetic card with bar code shown in FIG.

FIG. 3 is a characteristic diagram showing an example of an output waveform obtained by reading a barcode of a magnetic card with a barcode of the present invention by a magnetic head and a detection signal. FIG. 3A shows an output waveform of the magnetic head. FIG. 3 is a characteristic diagram showing three types of detection voltage levels.
FIG. 3B is a characteristic diagram showing an output signal at the detection level shown in FIG.

[Explanation of Codes] 1 magnetic card with bar code 2, 2a, 2b, 2c bar-shaped magnetic layer 3 magnetic recording surface 4 base film (polyethylene terephthalate-P
ET) 5 protective layer 6 magnetic recording layer S detection waveform of magnetic head Xa, Ya, Za detection voltage level Xb, Yb, Zb detection signal

Claims (1)

[Claims] 1. A magnetic card with a bar code, wherein a bar code comprising a bar-shaped magnetic layer is provided on a base material film of a support along the end face of the magnetic card in the running direction of the magnetic recording layer and the magnetic card. The coating thickness of each rod-shaped magnetic layer of the code is different, and the rod-shaped magnetic layer that outputs one signal at one detection level and the rod-shaped magnetic layer that outputs signals at at least two or more detection levels are combined. A magnetic card with a bar code, which is provided.