JP2556780B2 - Information recording method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording method.

[0002]

2. Description of the Related Art A recording medium using recording means such as magnetism can use recorded information as collating means for various purposes. For example, it is widely used for cash cards of banks and credit companies, and magnetic cards of credit cards. For these magnetic cards, the card issuer (for example, bank, credit company, etc.) usually magnetically records user information such as the personal identification number of the card, bank code number, deposit account number, etc. before handing over to the card user. However, the information recorded on the conventional magnetic card is easily forged as follows.

Counterfeit case 1 Magnetic recording layer of a cash card (usually formed in a stripe shape, commonly called a magnetic stripe)
In, a bank code number, a deposit account number, a personal identification number, etc. are magnetically recorded as user information. For example, a person who is involved in issuing a card can know the user information, so it is very easy to forge the card, erase the user's own information by putting the card owned by the person on a magnetic recording device, and use another person's card to forge. If the user information is newly magnetically recorded by the device, forgery can be easily performed. In this case, the recording condition such as the position of the first magnetic recording signal (bar code) (the distance from the end of the magnetic recording layer to the first magnetic recording symbol) and the magnetic recording density (number of bits) are the same as the card issuer. If you know enough, you can forge without any trouble.

[0004] Counterfeit case 2 The user information is obtained by stealing the card PIN from the operation of the person who withdraws cash using the cash dispenser, and the balance statement discarded by the withdrawer (the one sent out from the dispenser together with the cash). , Which is often discarded.) You can easily find out from the bank code number and the bank account number listed in. Therefore, the counterfeiter can carry out a forgery by putting a card owned by the counterfeiter on a magnetic recording device to erase his / her own user information and newly magnetically recording the user information of the other person who is known as described above. in this case,
When the counterfeiter's own card is immersed in the developing solution, a magnetic recording symbol (bar code) appears as an image, so that the recording conditions such as the position of the first magnetic recording symbol and the magnetic recording density (number of bits) can be determined by looking at the symbol. Therefore, magnetic recording can be performed in exactly the same manner as another person's card.

That is, in a conventional recording medium such as a magnetic card, only information such as user information recorded by the same person (usually a card issuer) is recorded. Easy to abuse. Moreover, since such information can be easily deleted or newly recorded, no effective means for preventing forgery has been established. The present invention has been made in view of the above points, and an object of the present invention is to provide an information recording method useful for using recorded information as collating means. More specifically, it is an object of the present invention to provide an information recording method in which a system for recording information on a recording medium is hard to be known. Another object of the present invention is to provide an information recording method in which recorded information cannot be easily rewritten and forged.

[0006]

That is, according to the information recording method of the present invention, a low coercive force magnetic layer and a high coercive force differing in coercive force by three times or more.
The magnetic layer and the magnetic layer are laminated, and each magnetic layer has a unique information recording area.
The user information recording area is divided into
The information recording area and the unique information recording area are arranged in a straight line.
The information in both areas is read once by the magnetic reader.
Can be read by a high magnetic field in a low magnetic field magnetic recording device.
Unique information of the magnetic layer cannot be rewritten, but low coercivity
Rewritable magnetic recording medium is used for user information of layers
Information recording method, which is a unique information recording area of the medium
In addition, a high magnetic field magnetic recording capable of performing magnetic recording on the high coercive force magnetic layer.
A process of recording unique information that differs for each medium using a recording device
And the low coercive force of the medium in which unique information is recorded in the high coercive force magnetic layer.
In the user information recording area of the magnetic layer, a low magnetic field is recorded.
A step of recording user information using a recording device .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of the present invention will be described below for recording information on a magnetic card such as a cash card and a credit card.

In FIGS. 1 and 2, reference numeral 1 denotes a magnetic card, which has a low coercive force magnetic layer 2 as shown in FIG.
And a high coercive force magnetic layer 3 are formed on the card substrate 5 so that the high coercive force magnetic layer 3 is on the lower side. It is preferable that the coercive force of the magnetic material is at least three times different between the low coercive force magnetic layer 2 and the high coercive force magnetic layer 3. That is, it is preferable that the coercive force of the high coercive force magnetic layer 3 is three times or more the coercive force of the low coercive force magnetic layer. The magnetic recording layer 4 is formed in a stripe shape as shown in FIG. Figure 2 is II of Figure 1
Although it is a vertical cross-sectional view taken along line -II, it is not illustrated as an accurate cross-sectional view, but is illustrated schematically for convenience of description. Therefore, hatching representing a cross section is also omitted.

The magnetic recording layer 4 is not limited to the stripe-shaped one, and the area of the recording layer 4 can be arbitrarily selected, and the end portion of the magnetic recording layer 4 in the longitudinal direction and the end portion of the card substrate 5 are separated from each other. The configuration may not match.

The coercive force of the low coercive force magnetic layer 2 and the high coercive force magnetic layer 3 can be arbitrarily selected, and various combinations of the two are possible. Generally, the coercive force of the magnetic layer standardized in the magnetic recording system is 300 Oe, 650 Oe,
There are 1050 Oe and 3000 Oe. In the case of a cash card, 650 Oe is currently used. Therefore, for example, when a low coercive force magnetic layer 2 having a coercive force of 650 Oe is used, the high coercive force magnetic layer 3 becomes the coercive force 65 of the magnetic layer 2.
Since the magnetic layer 3 needs to have a coercive force three times or more than 0 Oe, the magnetic layer 3 may have a coercive force of 3000 Oe, for example. Hereinafter, the coercive force of the magnetic layer 2 is set to 650O.
e, the case where the coercive force of the magnetic layer 3 is 3000 Oe will be described.

In the magnetic card 1 having the above-mentioned multilayer recording layer 4, a first person, for example, a card manufacturer, applies the card 1 to a magnetic recording device to record the card-specific information a on the magnetic recording layer 4. In this case, the card-specific information recording area 6 is provided in the recording layer 4 in advance, and the information a is recorded in the recording area 6. For example, in FIG. 1, an area on the right side of the dotted line 7 shown on the recording layer 4 is given as a card-specific information recording area 6. The magnetic layer for recording the card specific information a is not the low coercive magnetic layer 2 but the high coercive magnetic layer 3. Generally, when magnetic recording is performed on a magnetic layer, it is necessary to apply a magnetic field at least three times the coercive force of the magnetic layer.
Therefore, in the case of the present embodiment, it is necessary to apply a magnetic field of 9000 Oe to 10000 Oe in order to record the card specific information a on the magnetic layer 3. At this time, information a is simultaneously recorded on the magnetic layer 2 (FIG. 1B). The card unique information a to be recorded is arbitrary such as a card number and a card symbol. The card-specific information identifies the card, the card-specific information a is given to only one card, and the other card is given to another card.

Next, the card manufacturer erases the information a recorded in the magnetic layer 2 by using the magnetic recording device. Generally, to erase information recorded on a magnetic layer, it is necessary to apply a magnetic field at least three times the coercive force of the magnetic layer, as in the case of recording. Therefore, in this embodiment, it is necessary to apply a magnetic field of 2000 Oe to erase the information a from the magnetic layer 2. Now 2
It is assumed that the information a is erased from the magnetic layer 2 by applying a magnetic field of 000 Oe. Here, since a magnetic field of at least 9000 Oe is required to erase even the information a of the magnetic layer 3, the information a of the magnetic layer 3 is not erased, but only the information a of the magnetic layer 2 is erased. In this case, if the coercive force of the magnetic layer 3 is less than three times the coercive force of the magnetic layer 2, the magnetic layer 3 is affected,
Although there is a risk of demagnetization, this problem does not occur if the coercive force of the magnetic layer 3 is set to a value three times or more the coercive force of the magnetic layer 2 as in this embodiment. Thus, the magnetic card 1 in which the card-specific information is recorded only on the magnetic layer 3 is obtained.
(C)).

Next, a second person different from the first person, for example, a magnetic card issuer (bank, credit company, etc.) applies the magnetic card 1 to the magnetic recording device, and information different from the unique information, for example, The user information b is magnetically recorded. In this case, recording is performed in the user information recording area 8 of the recording layer 4. In FIG. 1, a region on the left side of the dotted line 7 shown on the recording layer 4 is given as a user information recording area 8. At present, magnetic recording devices installed in banks, credit companies, etc., have a magnetic field of about 2000 Oe. Therefore, in the user information recording performed by the magnetic card issuer, the information b is recorded only on the magnetic layer 2 and the magnetic layer 3 is recorded. Not recorded in. The user information b may be of the same type as in the past. For example, in the case of a cash card, a bank code number, a bank account number, a personal identification number, etc. are used as the user information b. Then, the card unique information a recorded in the card unique information recording area 6 by the first person and the user information b recorded in the user information recording area 8 by the second person.
As described above, the magnetic card 1 in which different persons record different information is issued (FIG. 1D).

A magnetic card in which the first person has recorded the card-specific information a and the second person has recorded the user information b as described above is collated by combining different information a and b in the information reading device. Therefore, this magnetic card is useful for preventing forgery. The principle will be described for a cash card.

The cash card issued by the information recording method of the present invention has user information recorded by the card issuer as well as card unique information recorded by a card manufacturer different from the issuer. At the payment machine, the card user is identified by combining these two pieces of information, so the counterfeiter knows the user information of the card from the balance statement etc. discarded by the legitimate card user and, for example, owns it. Even if the user information of the card to be read is replaced with the user information of another person who has been illicitly known, the card-specific information a
Since the combination of the user information b and the user information b is different, the device generates an ineligible signal and cash is not withdrawn. Further, as shown in FIG. 3A, a card that has only the card unique information a and does not record the user information b is placed on an unissued card. In the case where b is recorded by using a magnetic recording device installed in a bank or the like and forgery is attempted, forgery is prevented by the following principle. Here, it is assumed that “1” is recorded as the card unique information a. It is assumed that the counterfeiter has recorded the card unique information and the user information of another person on this unissued card. Here, it is assumed that the card unique information a of another person is “2”. In this case, the magnetic recording device installed in the bank, etc.
Since it is about 000 Oe, the card unique information a and the user information b are recorded only in the magnetic layer 2. Further, in this case, the card unique information "2" and "1" are vertically superimposed and recorded (FIG. 3B). When the counterfeiter tries to withdraw the cash by using the counterfeit card to the automatic teller machine installed in the bank, the waveform of the card-specific information "1" and the waveform of "2" are combined in the magnetic reading device to cause noise. As a result, the device cannot read the card-specific information and no cash is withdrawn. Similarly, cash is not withdrawn. As described later, the card unique information “1” cannot be deleted at first.

Next, a case where the counterfeiter makes a forgery by using his own card will be described. As shown in FIG. 4A, the card unique information a and the user information b are recorded on the card owned by the forger, and the card unique information a is assumed to be "3". The counterfeiter erases the information recorded on his or her own card and attempts to newly record the information on another person's card. Here, as described above, since the magnetic recording device which can be normally used has a magnetic field of about 2000 Oe, the user information b recorded on the magnetic layer 2 can be erased, but the card-specific information "" recorded on the magnetic layer 3 is stored. 3 "remains without being erased (FIG. 4B). It is assumed that card unique information a and user information b of another person's card obtained by some means are recorded on this card. Here, it is assumed that the other person's card unique information a is “2” as described above. For the same reason as described above, the information a and b are recorded only in the magnetic layer 2, and the card-specific information "2" and "3" are overlapped vertically and recorded (FIG. 4C). Even if this card is used, a crime can be prevented because the automatic teller machine cannot read it for the same reason as described above.

The magnetic card having the magnetic recording layer 4 in which the low coercive force magnetic layer 2 and the high coercive force magnetic layer 3 are laminated can be manufactured as follows.

FIG. 5 shows a manufacturing method by a transfer method.
According to this method, a peeling layer 10, a low coercive force magnetic layer 2, a high coercive force magnetic layer 3, and an adhesive layer (heat seal type) 11 are sequentially laminated on a support 9 to form an adhesive layer 11 of a magnetic transfer tape. After the side is brought into close contact with the card base material 5 and transferred by heating and pressurizing, the support 9 is peeled off (FIG. 5A), and the layer transferred to the card base material 5 by further heating and pressing is embedded so as to be flush with each other. As a result, a magnetic card can be obtained (FIG. 5 (B)).

A 25 μ thick polyester film or the like can be used as the support 9, a 1-3 μ thick polyester resin or a butyral resin or the like can be used as the release layer 10, and a vinyl chloride resin or the like can be used as the card base 5. . The thickness of the adhesive layer 11 is usually 10 to 15 μm, and a magnetic layer having a residual magnetic flux of 1.4 maxwell / cm is usually used.

To prevent the interaction between the magnetic layers 2 and 3 (for example, when laminating the magnetic layers 2 and 3, the surface of the lower layer is dissolved by a solvent to form surface irregularities). As shown, a barrier layer 12 having a thickness of 10 μm or less is preferably interposed between the magnetic layers 2 and 3. The barrier layer 12
For example, a synthetic resin film, an aluminum foil, or the like can be used.

FIG. 7 shows a magnetic card manufactured by a coating method. In this method, a magnetic layer 3, a magnetic layer 2, and a protective layer 13 made of, for example, a synthetic resin film are sequentially coated on a card base 5 and then heated. The coating is buried in the card substrate 5 by applying pressure to obtain a magnetic card flush with each other.

FIG. 8 shows a magnetic card manufactured by a laminating method. In this method, a base film 14 is obtained by sequentially laminating a magnetic layer 3, a magnetic layer 2 and a protective layer 13 on a base film 14. The adhesive 15 is released so as to be on the side of the card base 5, and the adhesive is adhered to the card base. Then, the adhesive part is embedded in the card base 5 by heating and pressurizing to obtain a magnetic card which is flush with each other. Is.

In the case of the magnetic card shown in FIGS. 7 and 8, a barrier layer 12 can be provided between the magnetic layers 2 and 3. FIGS. 5B to 8 are sectional views taken along line YY of FIG.

Next, the present invention will be described in more detail with reference to specific examples. Example 1 After magnetically recording predetermined card-specific information in a card-specific information recording area of a high coercive force magnetic layer of a multilayer recording layer of a magnetic card with a magnetic field of 10,000 Oe using a magnetic recording device,
The card specific information in the low coercive force magnetic layer was erased by the magnetic field of 2000 Oe. Next, predetermined user information was recorded in the user information recording area of the low coercive force magnetic layer by a magnetic field of 2000 Oe. After that, the user information was erased by a magnetic field of 2000 Oe, and another user information and card unique information different from the user information and the card unique information were recorded by the magnetic field of 2000 Oe. When the magnetic card was set on a magnetic reader, noise was generated and reading was impossible.

[0025]

As described above, according to the present information recording method, the low coercive force magnetic layer and the high coercive force differ in coercive force of three times or more.
A magnetic layer is laminated, and each magnetic layer serves as a unique information recording area.
The user information recording area is divided into
The recording area and the unique information recording area are arranged linearly,
Information in both areas can be read with a single operation of the magnetic reader.
It is possible to remove only a high coercive force in a low magnetic field magnetic recording device.
Although the unique information of the magnetic layer cannot be rewritten,
User information is information that uses rewritable magnetic recording media
A recording method, in which a high
High magnetic field magnetic recording device capable of magnetic recording on the coercive force magnetic layer
The process of recording unique information that is different for each medium using
Low coercive force of medium in which specific information is recorded in coercive force magnetic layer
Magnetic field recording device in the user information recording area of the magnetic layer
And the process of recording user information using
By adopting, compared with the conventional information recording method,
The recording method becomes complicated and it is difficult for others to know the system
Become. Therefore, it is possible to prevent the information recording medium from being forged.
It is useful as a matching means in various applications. Furthermore, the book
The invention information recording method is different in that the respective information does not overlap.
The unique information and user information are recorded once
Since it can be played back by reading the
It is extremely easy to pick up and requires special playback equipment.
No need to do special processing after scanning
Quickly read the information on the information recording medium and
The combination can be performed easily and quickly. Further information of the present invention
The recording method is such that unique information is recorded in the high coercive force magnetic layer and
Since it cannot be rewritten in the field magnetic recording device, it is illegal.
Forgery of the information recording medium no matter where the unique information is known
Since it can be prevented, the information recording medium is highly safe. Only
Also, the user information has a low coercive force due to the low magnetic field magnetic recording device.
Recording on the magnetic layer facilitates magnetic recording.
Wear. As described above, the information recording method of the present invention can be performed by the recording medium user.
When using the user, the operations such as reproduction and verification are extremely easy.
It also has the effect of being highly safe.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a recording medium used in the method of the present invention.

FIG. 2 is an explanatory diagram showing a process of recording information.

FIG. 3 is an explanatory view showing the principle of forgery prevention.

FIG. 4 is an explanatory diagram showing another example of the forgery prevention principle.

FIG. 5 is a vertical cross-sectional view showing a method of manufacturing a magnetic card as an example of a recording medium.

FIG. 6 is a vertical cross-sectional view showing another example of a magnetic card as an example of a recording medium.

FIG. 7 is a vertical cross-sectional view showing another example of a magnetic card as an example of a recording medium.

FIG. 8 is a vertical sectional view showing still another example of a magnetic card as an example of a recording medium.

[Explanation of symbols]

 1 magnetic card 2 low coercive force magnetic layer 3 high coercive force magnetic layer 4 magnetic recording layer 5 card base material 6 card unique information recording area 8 user information recording area a card unique information b user information

Claims (1)

(57) [Claims] 1. A low coercive force magnetic layer having a coercive force different by three times or more.
High coercive force magnetic layer is laminated, and each magnetic layer records unique information
Area and user information recording area
-The information recording area and the unique information recording area are arranged in a straight line.
The information of both areas is stored in the magnetic reader once.
It is readable by operation and high in a low magnetic field magnetic recording device.
Coercive force Unique information of the magnetic layer cannot be rewritten, but low coercive force
Rewritable magnetic recording media is used for the user information of the magnetic layer.
The method for recording information on a medium , the method comprising:
Use a high-field magnetic recording device that can perform recording, and
And the low coercive force of the medium in which the specific information is recorded in the high coercive force magnetic layer.
In the user information recording area of the magnetic layer, a low magnetic field magnetic recording device
Recording user information using a storage device
Information recording method characterized by.