JPH09231552A - Information recording medium and its recording and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium which allows the setting of intrinsic information on information recording media so as to vary the information from each other between the respective media and has excellent characteristics, such as workability to the information recording media, degree of freedom in setting of forming points and reading and reproduction characteristics of the intrinsic information and its recording and reproducing method. SOLUTION: Magnetic information patterns 3 are formed on at least part on a base material 11 as magnetically recordable magnetic codes consisting of a magnetic recording material having high coercive force with which writing by a magnetic head at ordinary temp. is substantially impossible and having low Curie point at which writing by the magnetic head by heating is substantially possible. Magnetic bars (magnetic code) 3a are arranged at the same and equal intervals at the time of production. As a result, the cost is reduced and the production efficiency is enhanced. Reading by using magnetic developers, etc., is non-discriminatable in a magnetization direction and is difficult. The execution of ternarized information recording with one magnetic bar (magnetic code) is made possible by using the non-magnetized magnetic bars (magnetic codes). The recording density of the medium is thus increased.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a credit card, a cash card, a prepaid card, a magnetic passbook,
The present invention relates to an information recording medium provided with a magnetic information pattern composed of a magnetic code capable of preventing fraudulent acts such as forgery, falsification, and alteration used for securities such as magnetic tickets and commuter passes, and a recording / reproducing method thereof.

[0002]

2. Description of the Related Art In recent years, securities such as credit cards, cash cards, and prepaid cards have been used as a transaction means instead of money. Such securities include
An information recording medium having an information recording means capable of recording financial data such as an amount of money is used. This type of information recording medium has an information recording section including a magnetic recording layer capable of magnetically writing and reading information and an optical recording layer capable of optically writing and reading information. Depending on the application, information about the validity (credit) of the information recording medium
ID information indicating validity information, value information, etc., holder information, information regarding money, etc. are written. Further, there is also an information recording medium including a plurality of information recording units and recording the above-mentioned various information in a dispersed or redundant manner.

By the way, since this type of information recording medium has a high added value, it may be forged, tampered with, and altered, and therefore, measures against fraud such as forgery, alteration, and alteration have been taken. Here, as a measure against fraud such as forgery, falsification, and alteration, in a magnetic medium having a magnetic recording portion that is generally used, reading / writing can be performed only by a special magnetic head.
A method to prevent falsification / alteration of recorded information and forgery of recorded information by prohibiting reading / writing by a reader / writer that is easily available in the city by using a high coercive force magnetic recording layer or a magnetic shield layer that enables writing There is. Also, in order to discriminate between authenticity when manufacturing a medium, a hologram that has information such as a pattern or a bar code as fixed information on a part of the medium in advance, or a print made of a special ink such as a magnetic material, an infrared absorbing agent or fluorescent coloring There is a method of forming a pattern or the like and reading fixed information magnetically and optically at the time of issuing or trading a medium to identify the medium and confirm its validity.

Particularly, in the latter case, a magnetic code is provided on the medium as fixed information for identifying the medium and confirming its effectiveness. For example, there is a magnetic bar code, and this magnetic bar code has dirt and stains as compared with an optical bar code. It is used as one of the security functions because it has the advantage that it is resistant to rubbing and the like, it has high reliability, and the magnetic material used is special, so that it is difficult to be forged. For example, as shown in FIG. 11A and a cross-sectional view taken along line TT of FIG. 11, on the magnetic recording layer 12 provided on the base material 11 for recording normal information, or on the base material 11 on the magnetic recording layer. Magnetic bar containing a magnetic material having a coercive force lower than that of the magnetic material used 1
There is an information recording medium 10 in which 3 is formed in a rectangular shape by a known forming means such as an offset printing method and a screen printing method, and has the same shape as a measure against fraud such as forgery, falsification, alteration, and the like. The dummy bar 14 having no characteristic can also be provided by a known forming means. A hiding layer 15 and a protective layer 16 may be further provided on such a medium.

[0005]

However, although the above magnetic bar code is effective in applications such as the type of medium, it is currently less effective as a measure against fraud. The combination of the magnetic bar and the dummy bar is difficult to distinguish visually, but magnetically,
For example, the magnetic bar code information is highly likely to be decoded because it can be relatively easily identified by using a magnetic developer or the like. Furthermore, since there is only one set (one type) of fixed information for confirming the validity, which is formed by a magnetic barcode, and is used for all issued information recording media, it is possible to decode or imitate the fixed information. Therefore, it is reproduced on other media, there is a possibility of forgery and falsification, and there is a very high possibility of altering the genuine product. For such a problem, there is a demand for a method of identifying an information recording medium and confirming its effectiveness, and surely preventing fraudulent acts. Further, in the magnetic recording method, when a magnetic material having a normal coercive force is used, there is a problem of accident or misconduct because it is demagnetized under the influence of an external magnetic field and can be easily rewritten. There is.

Therefore, in the case of holding the unique information in the information recording medium, it is necessary to set the dissimilarity of the unique information, that is, the unique information can be set so as to be different from each other. It is an object of the present invention to provide an information recording medium and a recording / reproducing method thereof, which are more excellent in characteristics such as processability, degree of freedom in setting a forming location, and reproducibility of reading unique information.

[0007]

The present invention has been made to achieve the above object, and the invention described in claim 1 is
From a magnetic recording material that has a high coercive force at which writing with a magnetic head is substantially impossible at room temperature, and has a low Curie point at which writing with a magnetic head is substantially possible by heating The information recording medium is characterized by comprising a magnetic information pattern as a magnetic code capable of magnetic recording.

The invention described in claim 2 is the same as claim 1.
In the information recording medium described in (1), the magnetic recording material is an information recording medium having a coercive force of 10,000 [Oe] or more at room temperature.

[0009] The invention described in claim 3 is the first invention.
In the information recording medium described in (1), the magnetic recording material has an Curie point of 150 ° C. or lower.

[0010] The invention described in claim 4 is the first invention.
The information recording medium as described in 1 above, wherein a rewritable magnetic recording portion is provided on the base material.

Further, the invention according to claim 5 is the information recording medium according to any one of claims 1 to 4, wherein the magnetic information pattern is heated to a temperature at which writing by a magnetic head is possible. Binarized information or ternary information is recorded while distinguishing the magnetization direction by a clock synchronized with the period of the magnetic code of the magnetic information pattern, and the magnetic information pattern is recorded at room temperature with the magnetization direction of the magnetic code. A recording / reproducing method for an information recording medium, which is characterized in that the recorded information is read separately.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the information recording medium of the present invention, FIG. 2 is a sectional view taken along line XX of the information recording medium shown in FIG.
FIG. 4A is a plan view showing another embodiment of the information recording medium of the present invention and FIG. 4B is a sectional view taken along line YY, and FIG. 4 shows another embodiment of the information recording medium of the present invention. a) a plan view and (b) a sectional view taken along line ZZ, and FIGS. 5 and 8 are explanatory views schematically showing a method of writing information to a magnetic information pattern of an information recording medium of the present invention, 6 and 9 are explanatory views schematically showing a method of reading information of a magnetic information pattern of an information recording medium of the present invention, and FIGS. 7 and 10 are books read by the reading method of FIGS. 6 and 9. It is a read waveform diagram showing the magnetic information pattern of the information recording medium of the invention.

First, materials applied to the information recording medium according to the present invention will be described. The information recording medium of the present invention is required to be composed of a magnetic material that is hard to be tampered with such as demagnetization and rewriting of the magnetic information pattern. In the present invention, magnetic writing is possible at room temperature (0 to 40 ° C.). A magnetic material is used which is very difficult and can be magnetically written after the coercive force is lowered by heating and can be read by a reading means such as an ordinary magnetic head. Such a magnetic material needs to have a coercive force that cannot be recorded by a magnetic recording means such as a magnetic head made of sendust or an amorphous magnetic alloy generally used for magnetic recording. So with a normal magnetic head, 50 at room temperature
If it is more than 00 [Oe], saturated writing is generally impossible, but the maximum saturation magnetic flux density of the magnetic head is about 10
Since it is about 000 [Oe], the magnetic material used in the present invention is preferably 10,000 [Oe] or more. Further, a simple means such as a thermal head, a halogen lamp, and a laser beam can be used as a heating means for lowering the coercive force for performing magnetic writing, and the information recording medium is not affected by heating. To achieve this, ideally, about 150 ° C. is desirable, but it may be about 200 ° C. or lower.

As such a magnetic material, Ga, A
Ba ferrite in which a part of Fe is replaced with 1, L, Cr, etc., G
There are oxide-based materials such as Sr ferrite substituted with a, Al, and Cr, and Sm-Co-based and Nd-Fe-B-based alloy materials. For example, as magnetic materials, oxides such as Ba ferrite or Sr-based ferrite, Mn-Cu-based ferrite, Ni-Zn-based ferrite, Mn-Zn-based ferrite, Fe-Ni-based, Ni-Cu-based, Fe-Ni are used.
Demagnetizing material such as -Cr-Si system, and Sm-Co system, N
There are d-Fe-B based alloy materials and the like.

More specifically, Japanese Unexamined Patent Publication No. 5-17436
No. 0, as disclosed in MeO.n [Fe_2-xyz
Ga_xCr_yAl_zO_Three] (In the formula, Me is Ba, St,
One or more of Pb and Ca, and 4.5 ≦
n ≦ 6, x ≧ 0, y ≧ 0, z ≧ 0, x / 3 + y / 4 + z
/ 6 ≧ 1/6, x / 6 + y / 10 + z / 11 ≦ 1 /
6), RxFe_100-xyzB_yM_z(In the formula, R includes Y
More than one kind of rare earth element, M is Ti, V,
Zr, Cr, Mn, Nb, Ta, Hf, W, Mo, N
at least one of i, Cu and Zn, and x, y
And z represent atomic percentages, 5 ≦ x ≦ 30, 2 ≦ y ≦ 3
0 and 3 ≦ z ≦ 35. ), S_mxNi_yCo _100-Xy
(In the formula, x and y represent percentages, and 8 ≦ x ≦ 25, 3
0 ≦ y ≦ 70. ), R [Co_1-xNi_x]_yB_z
(In the formula, R is one or more kinds of rare earth elements including Y,
Further, 0.05 ≦ x ≦ 0.5, 1.8 ≦ y ≦ 5.5, 0.
18 ≦ z ≦ 2.4. ) Magnetic materials such as
Materials with a Curie temperature of 200 ° C or less at 5000 [Oe] or more
Used as a fee.

The average particle size of the magnetic particles used in the magnetic information pattern is preferably in the range of 0.5 to 40 μm. Further, as a magnetic information pattern, when a plurality of types of magnetic particles having different coercive forces are mixed,
It has a merit that it becomes a special material system and can have extremely high security.

As a binder for dispersing magnetic particles,
Epoxy, polyester, acrylic, vinyl chloride-vinyl acetate copolymer, nitrocellulose, polyurethane, etc. can be used, but since the heating is performed when information is recorded in the information information pattern, the information information pattern itself remains thermoplastic. Is deformed, it is necessary to crosslink the binder by using a curing agent such as isocyanate or melamine to form a thermosetting film.

Next, as a method of forming a magnetic information pattern, a magnetic ink containing at least magnetic particles or a combination thereof with non-magnetic particles and the above-mentioned binder is used to obtain a magnetic code as shown in FIG. A method of directly printing a magnetic information pattern in which a plurality of magnetic bars are arranged in a bar code shape on a base material, or the information recording medium of the present invention may have magnetic patterns at the same intervals at the time of manufacture, and therefore the magnetic pattern is transferred. Printing as functional media such as stickers and stickers
After formation, there is a method of adhering this functional medium to a base material to form an information recording medium. According to these methods,
It is relatively inexpensive and excellent in workability. Especially, the latter has a high degree of freedom in setting the formation location and can reduce the cost of the information recording medium.

FIG. 1 is a plan view schematically showing the structure of the information recording medium of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. In this information recording medium 1, as a rewritable information recording section 2 on a support 11, a magnetic recording section is formed on the entire surface of the support 11 by a gravure coating method, and the above-mentioned magnetic recording section 2 is formed. A magnetic information pattern 3 composed of a magnetic bar (magnetic code) having a predetermined reading width, which is made of magnetic ink satisfying the material conditions, is selectively formed along the longitudinal direction of the support 11 by a screen printing method. Further, a concealing layer 4 and a protective layer 5 are formed on the entire surface of the support 11 on the magnetic information pattern 3 and the information recording portion 2 by a gravure coating method.

Here, as the base material 11, since reading or writing by an issuing machine of an information recording medium and reading by a reader are executed, mechanical strength, flexibility and flexibility, for example, paper, or Polymeric resins such as vinyl chloride resin, vinyl acetate resin, polyethylene terephthalate resin, polyetherimide resin, polyester resin, polycarbonate resin, acrylic resin, and cellulose resin can be used alone or in combination, and the present invention is particularly preferable. Since the information recording medium (1) is a heat recording type, a base material having high heat resistance is preferable.

The information recording section 2 records, for example, ordinary transaction information as digital information in a readable / writable manner according to the type of the information recording medium. Ordinary transaction information has, for example, transaction date, credit balance, deposit balance, prepaid balance, expiration date, etc. depending on the type of information recording medium, and the identification and validity of the information recording medium by the recording / reproducing method of the present invention are confirmed. After that, predetermined processing is executed. As the information recording format, in addition to the above magnetic recording layer, a magnetic recording method such as a magnetic tape, an IC
Although an electric recording method such as a memory and an optical recording method such as an optical memory can be used, a magnetic recording method is used in this embodiment.

The magnetic information pattern 3 indicates the unique information of the information recording medium 1. Specifically, the magnetic information pattern 3 has a linear shape or a bar shape in which the width and the spacing are arranged according to an arbitrary rule. It is possible to use a code represented by any one of a mark that becomes a part of a shape, a curved shape, a character or a symbol, or a combination thereof, and this code indicates unique information. Here, a bar-shaped bar code is applied to the magnetic information pattern, and the magnetic information pattern is formed by applying a magnetic ink in which magnetic particles are dispersed in a polymer material.

The hiding layer 4 is composed of the above magnetic information pattern 3,
A non-magnetic material that conceals the information recording layer 2 and does not affect the concealing property that makes them invisible and the magnetic information pattern 3 and the reading / writing of the information recording layer 2. Known aluminium, tin,
Non-magnetic metals such as copper and gold are deposited by vacuum vapor deposition, physical vapor deposition such as sputtering, or chemical vapor deposition (CVD).
It is possible to form it by a known forming method such as a method, and also known is a paint in which a scale-like metal or non-metal powder such as aluminum, brass, mica is dispersed in a polymer material (binder) such as a synthetic resin. It can be formed by printing / application means. Further, a hiding pigment having a high degree of whiteness such as zinc sulfide, titanium oxide or barium sulfate, or a hiding pigment having a dark black or brownish dark hue such as carbon black or non-magnetic α-iron oxide is used as a polymer such as a synthetic resin. The coating material dispersed in the material (binder) can be formed by known printing / coating means. These various concealing materials are also non-magnetic materials that do not affect the reading / writing of the magnetic information pattern 3 and the information recording layer 2. The maximum layer thickness of the hiding layer 4 is preferably 5 μm or less.

Further, the protective layer 5 is provided in the outermost layer for the purpose of protecting the surface of the information recording medium and improving durability, and is made of, for example, polyester resin, acrylic resin, polyurethane resin, epoxy resin, vinyl chloride resin, acetic acid. A polymer resin such as a vinyl resin can be used alone or as a mixture of two or more kinds, or a copolymer thereof can be used, and these can be formed by a known printing / coating means by dissolving or dispersing a solution in a solvent. it can. In addition, a curable resin such as a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin can be used. The resin can be appropriately selected from these resins in consideration of the usage form, application, etc. of the information recording medium.
If necessary, additives such as a matting agent and a slip agent can be added to these resins. The layer thickness of the protective layer 5 is appropriately about 1 to 5 μm, but similarly, it can be arbitrarily set within a range that does not affect the reading / writing of the magnetic information pattern 3 and the information recording layer 2. .

Although not shown, a pattern printing layer may be provided on the information recording layer 2 and the magnetic information pattern 3 instead of the concealing layer 4, and then a protective layer 5 may be provided. The pattern printing layer also functions as a concealing layer, and a pattern of any design can be formed on the information recording layer 2 and the magnetic information pattern 3 by a known printing means, and the protective layer 5 protects the surface of the information recording medium. However, it is provided in the outermost layer for the purpose of improving durability, and is the same as that described above.

Here, as the first recording / reproducing system, FIG.
In the method of writing information to the magnetic information pattern of the information recording medium of the present invention shown in FIG. 2, when the information recording medium 1 is taken in, the magnetic information pattern 3 of the information recording medium is heated to about 120 to 150 ° C. by the heater 22 for heating. Heating, magnetic head 2
Each magnetic bar 3a constituting the magnetic information pattern 3 by 1
On the other hand, based on the write waveform 23, the direction of N → S is set to 0, the direction of S → N is set to 1, or vice versa.
The binarized data, where the direction of is 1 and the direction of S → N is 0,
That is, digital information can be recorded. In addition,
The magnetic information pattern 3 depends on the number of magnetic bars 3a formed.
Information amount is determined. In particular, in the case of an information recording medium such as a card, gift certificate, stock certificate, etc., where the formation portion is limited, the magnetic bar 3a
Magnetic bar 3a that can be formed by reducing the line width of
The amount of information can be increased to increase the amount of information.

Further, the unique information of the information recording medium 1 can be arbitrarily given to the magnetic information pattern 3 when the information recording medium is issued, and different unique information can be given to each information recording medium. it can. In addition to the unique information, various kinds of information can be digitally recorded.

Next, in the method of reading the information of the magnetic information pattern of the information recording medium of the present invention shown in FIG. 6, the magnetic head 21 corresponds to the magnetic information pattern 3 when the information recording medium 1 is loaded. An analog voltage signal 2 that generates a voltage and reads the magnetic information shown in FIG. 7 and is represented by a waveform
4 is obtained. In addition, this analog voltage signal 24 is
It is also possible to perform A / D conversion into a pulse read signal by a D converter and to apply this pulse read signal (not shown) to a display device (not shown) or a collating device (not shown).

As an application example of the information recording medium of the present invention,
For example, in a prepaid card in which a predetermined amount of money is recorded, as shown in FIG.
An information recording section 2 composed of a rewritable magnetic recording means is formed on a base material 11, and information unique to the information information medium, for example, an issue code number, is written in at least one column of the magnetic information pattern 3 when the medium is issued. Write by method,
Various information such as ticket type information and initial price information can be written in the magnetic information pattern 3 in the other columns by the same writing method. In this way, these various information recorded at the time of issuance are reproduced by the above-mentioned reading method,
After confirming that it is the same as the written information, the scrambled or encrypted information is written directly or scrambled or encrypted in the information recording unit 2 provided in the information information medium and is issued as a prepaid card.

In this prepaid card, the fixed information peculiar to the medium of the magnetic information pattern 3 and the fixed information peculiar to the medium recorded in the information recording section 2 are compared and collated at the time of transaction, and it is confirmed whether or not the bill is genuine. Later, we will move on to trading work.

As an example of using the code, the magnetic head 2
An analog voltage signal 24 read from the magnetic information pattern 3 by 0 is A / D converted into a pulse read signal by an A / D converter, and a pulse read signal obtained by the A / D converter is supplied to an encryption code creating device (not shown) to perform encryption. The code creation device encrypts this pulse read signal according to a specific rule to generate an encryption code, and digitally records this encryption code in a predetermined area of the information recording unit 2 of the information recording medium by a digital information recording device (not shown). Here, a magnetic recording means is used in the information recording section 2, and a magnetic head is used as the writing / reading means.
It should be noted that the digital information recording apparatus may use other optical bar code or OCR (optical charac- ter) depending on the use of the information recording medium.
ter reader) code, MICR (magnetic ink charact)
er reader) code, IC memory, optical memory, or the like.

On the other hand, the digital information reader (not shown) reads the cryptographic code and normal transaction information from the information recording section 2 of the information recording medium, and gives the cryptographic code to the cryptographic code reader (not shown). Therefore, a magnetic head or the like is used here.

Incidentally, the digital information reading device is based on the digital information recording method of the information recording section 2 of the information recording medium, and is based on the optical bar code and OCR (optical character read).
er) code, MICR (magnetic ink character reade)
r) The code may be read from a code, an IC memory, an optical memory or the like.

The cipher code reader interprets the cipher code received from the digital information reader to create a collation code and gives it to the collation device. The collation code and the magnetic head 21 read the magnetic information pattern 3. By comparing the analog voltage signal 24 with a pulse read signal obtained by A / D conversion, it is determined whether the two match or mismatch. When both match, it is determined that the information recording medium is genuine, and when both do not match. The information recording medium is determined to be fake. The determination result may be displayed on a display device (not shown).

As a second recording / reproducing system, the method of writing information to the magnetic information pattern 3 shown in FIG. 8 is for heating the magnetic information pattern 3 of the information recording medium when the information recording medium 1 is taken in. About 120 to 1 depending on the heater 22
For each magnetic bar 3a that forms the magnetic information pattern 3 by heating the magnetic head 21 at 80 ° C., for example, non-magnetization is 0, N → S direction is 1, S → N based on the write waveform 25. The magnetic bar 3a is set so as not to be magnetized, the direction of N → S, and the direction of S → N so that either of 0, 1, or 2 is selected so that the direction of 2 is set to 2. Thus, ternary digital information can be recorded, and the amount of recorded information can be further increased. Similarly, the amount of information is determined by the number of magnetic bars 3a forming the magnetic information pattern 3, and particularly in the case of an information recording medium having a limited formation part such as a card, a gift certificate, or a stock certificate, the line width of the magnetic bar 3a is reduced. By doing so, the number of magnetic bars 3a that can be formed can be increased and the amount of information can be increased.

The unique information of the information recording medium 1 can be arbitrarily added to the magnetic information pattern 3 when the information recording medium is issued, and different unique information can be given to each information recording medium. it can. In addition to the unique information, various kinds of information can be digitally recorded.

Next, in the method of reading the information of the magnetic information pattern of the information recording medium of the present invention shown in FIG. 9, the magnetic head 21 corresponds to the magnetic information pattern 3 when the information recording medium 1 is loaded. A voltage is generated to read the magnetic information shown in FIG. 10 to obtain an analog voltage signal 26 represented by a waveform. In addition, this analog voltage signal 26 is
It is also possible to perform A / D conversion into a pulse read signal by a / D converter and provide this pulse read signal (not shown) to a display device (not shown) or a collating device (not shown). The processing method according to the subsequent application examples can be performed in the same manner as above, and will be omitted.

As described above, according to the information recording medium of the present invention and the recording / reproducing method thereof, the information recording medium of the present invention is very magnetically writable at room temperature (0 to 40 ° C.) for forming the magnetic information pattern. Since a magnetic material is used that is difficult and can be magnetically written after the coercive force is lowered by heating and can be read by a reading means such as an ordinary magnetic head, it is formed on the medium at the time of manufacturing the medium. The magnetic information patterns to be formed are the same, and it is only necessary to arrange the magnetic bars at equal intervals, and at the time of manufacturing, there is no need to change the record information so that the magnetic patterns are different for each medium.
Highly effective in reducing the manufacturing cost, and because the magnetic material having the above characteristics is used, rewriting cannot be performed with an ordinary magnetic reader / writer, and the manufacturing of the medium and the issuing of the medium are separated, which is extremely high. A security environment can be provided.

Further, even if an attempt is made to confirm the bar pattern by using a magnetic developer or the like in the magnetizing direction (N → S direction, S → N direction), the directionality of the N pole and the S pole cannot be discriminated. Reading the data is consequently impossible.
Further, by using a magnetic bar (magnetic code) that is not magnetized, it is possible to perform ternary information recording with one magnetic bar (magnetic code), and it is possible to further improve the recording density of the medium. .

[0040]

The present invention will be described in detail below with reference to specific examples of the present invention.

<Example 1> The substrate 11 has a thickness of 188 μm.
An information recording layer 2 made of Ba ferrite having a coercive force of 1750 [Oe] and a residual magnetic flux density of about 1400 gauss is formed on the entire surface of a polyethylene terephthalate (PET) resin sheet of m.
As a magnetic recording layer 2 ′ having a thickness of about 10 μm.
A magnetic bar (magnetic code) 3 was obtained by using a magnetic screen ink in which Nd-Fe-B alloy magnetic powder at 0 ° C was dispersed in vinyl chloride acetate resin at a weight ratio of magnetic powder / resin = 5/1.
a is a film thickness of about 5 μm, a bar width of 0.5 mm, and an interval of 0.5 mm
The magnetic information patterns 3 were formed at a regular interval of 48 by one line 48 screens in total, so that a total of 96 magnetic information patterns 3 were formed in two lines. Further, in order to conceal the magnetic information pattern 3 and the magnetic recording layer 2 ′, a concealing silver ink is used to print on the entire surface of the base material 11 by a screen printing method, and the magnetic bar (magnetic code) 3a of the magnetic information pattern 3a is formed. 54m to hide the hue of
Stamped into a card shape measuring mx 86 mm, and
The information recording medium 6 shown in (a) and (b) was produced.

Next, an example of issuing a ticket as a prepaid card using the information recording medium 6 will be described. As shown in FIG. 5, the magnetic information pattern 3 is set by using the heater 22 for heating.
The first track 3 is heated by the magnetic head 21 after being heated to 60 ° C.
6b information as the issue code information (issue code No.) in b, ticket type information in the second track 3c, and 6 byte information as the initial amount information in the direction N → S 0, S
→ Digitally recorded with the direction of N as 1. As shown in FIG. 6, after confirming that the analog voltage signal 26 read from the digitally recorded magnetic information pattern 3 is a pulse read signal obtained by A / D conversion and that it matches the recorded information, if necessary, Then, each of the above information and various transaction information is encrypted and magnetically recorded on the magnetic recording layer 2 ', and issued as a prepaid card.

By issuing the ticket, the prepaid card is verified at the time of transaction after the magnetic code data of the magnetic information pattern 3 and the magnetic recording data recorded on the magnetic recording layer 2'are collated as fixed information and confirmed to be genuine. It has high security because it enters into the transaction operation. The issued prepaid card has a magnetic bar (magnetic code) 3
Even if a is confirmed with a magnetic developer, all recording pits are N pole, S
Although it is magnetized at any of the poles, it is difficult to determine the fixed information because it is not possible to determine which is the magnetic information pattern 3 even if a permanent magnet having a residual magnetic flux density of 3000 gauss is brought into contact with the prepaid card. It was not demagnetized or demagnetized, the magnetic reproduction output was not attenuated, and the magnetic code data could be read as fixed information.

<Example 2> The substrate 11 which is a core sheet is a white vinyl chloride resin sheet having a thickness of 560 μm, and designs such as patterns and characters are formed on the front surface and the back surface by the offset printing method and / or the screen printing method. After printing on one part, a 110 μm thick transparent vinyl chloride resin sheet is laminated on the front and back as the oversheet 31,
On one surface, coercive force of 650 [Oe], residual magnetic flux density of about 1600 gauss, and 9 μm thick Co-deposited γ-Fe ₂
A transfer type magnetic tape having a magnetic recording layer made of O ₃ was adhered, and the magnetic recording layer 2 ″ was transferred and formed as the information recording layer 2. Further, the room temperature coercive force was 10000 [Oe] and the Curie point was 180 ° C. Sm-Co. Magnetic bar (magnetic code) using a magnetic screen ink in which a magnetic alloy magnetic powder is dispersed in vinyl chloride acetate resin at a magnetic powder / resin = 6/1 weight ratio
3a film thickness of about 7 μm, bar width 0.7 mm, spacing 0.7 m
40 magnetic information patterns 3 were formed in a line by screen printing at equal intervals of m. Further, in order to conceal the magnetic information pattern 3 and the magnetic recording layer 2 ″, the concealing layer 4 is transferred and formed on the entire surface of the base material 11 by using a concealing silver transfer thin film, and the magnetic bar (magnetic code of the magnetic information pattern 3 ) Concealing the hue of 3a, and further flushing with a hot press at 130 ° C. and punching into a card shape with dimensions of 54 mm × 86 mm to produce an information recording medium 7 shown in FIGS. .

Next, an example of issuing a ticket as a credit card using this information recording medium 7 will be described. As shown in FIG. 8, the magnetic information pattern 3 is formed by using the heater 22 for heating.
After heating to 60 ° C., 10-byte information as issue code information (issue code No.) is recorded on the track 3d by the magnetic head 21, 0 for no magnetization, 1 for N → S direction, 2 for S → N direction. As a result, three-value digital recording was performed. As shown in FIG. 9, after confirming that the analog voltage signal 26 read from the magnetically recorded magnetic information pattern 3 is a pulse read signal obtained by A / D conversion, it is confirmed that it matches the recorded information, and then if necessary, The above information, ID information, ticket type information, and various transaction information are encrypted and magnetically recorded on the magnetic recording layer 2 ″, and issued as a credit card.

By issuing the ticket, the credit card is verified as a genuine note at the time of transaction by comparing the magnetic code data of the magnetic information pattern 3 as the fixed information with the magnetic record data recorded on the magnetic recording layer 2 ". It has a high security because it enters into a transaction operation, and this issued credit card has a magnetic bar (magnetic code) 3.
Even if a is confirmed with a magnetic developer, it is possible to distinguish between a magnetized pit and a non-magnetized pit, but it is impossible to determine whether the magnetized pit is magnetized to the N pole or the S pole. As a result, fixed information is difficult to decipher. Further, even if a permanent magnet having a residual magnetic flux density of 3000 gauss is brought into contact with a credit card, the magnetic information pattern 3 is not demagnetized or demagnetized, the magnetic reproduction output is not attenuated, and magnetic code data is read as fixed information. I was able to.

[0047]

As described above, according to the information recording medium of the present invention, it is very difficult to magnetically write the information recording medium of the present invention at room temperature (0 to 40 ° C.) for forming a magnetic information pattern. Since a magnetic material that can be magnetically written after the coercive force is lowered by heating and can be read by a reading means such as a normal magnetic head is used, rewriting cannot be performed with a normal magnetic reader / writer. Further, since the production of the medium and the issuance of the medium are separated, it is possible to provide an extremely high security environment. Further, at the time of manufacturing, the information recording medium of the present invention can form a magnetic information pattern only by arranging magnetic bars (magnetic codes) that are the same and are arranged at equal intervals, so that it is not necessary to form different unique information at the time of manufacturing. Therefore, since the plurality of plates are not used for forming the magnetic information pattern, the information storage medium can be manufactured at low cost and high production efficiency. That is, the manufacturing side does not need to prepare a card for each bill type, the medium sheet can be put into one type, and the issuing side is free from the problem that the particular card is out of stock and cannot be issued.

Further, even if an attempt is made to confirm the bar pattern by using a magnetic developer or the like in the magnetization direction (N → S direction, S → N direction), the directionality of the N pole and the S pole cannot be discriminated. Information security is high so that it is impossible to read the data as a result. Also, by using a magnetic bar (magnetic code) that is not magnetized, it is possible to perform ternary information recording with one magnetic bar (magnetic code),
It is possible to further improve the recording density of the medium.

According to the recording / reproducing method of the information recording medium of the present invention, the magnetic information pattern and the information recording layer are formed,
The unique information of the magnetic information pattern and the information recording section each have digital information showing the same content as the unique information, and at the time of authenticity determination, the unique information shown by the magnetic information pattern and the information recording section. When the unique information of the magnetic information pattern or the digital information of the information recording portion is forged, falsified, or altered, for example, the unique information and the digital information do not match. When the information recording medium is authentic, the predetermined process is permitted to be executed and the process is executed.
The fraud prevention effect can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an information recording medium of the present invention.

2 is a cross-sectional view taken along line XX of the information recording medium shown in FIG.

3A is a plan view showing another embodiment of the information recording medium of the present invention and FIG. 3B is a sectional view taken along line YY.

FIG. 4 is a plan view (a) and a cross-sectional view (b) taken along line ZZ showing another embodiment of the information recording medium of the present invention.

FIG. 5 is an explanatory view schematically showing a method of writing information on a magnetic information pattern of the information recording medium of the present invention.

FIG. 6 is an explanatory view schematically showing a method of reading information of a magnetic information pattern of the information recording medium of the present invention.

7 is a read waveform diagram showing a magnetic information pattern of the information recording medium of the present invention read by the reading method of FIG.

FIG. 8 is an explanatory view schematically showing a method of writing information in a magnetic information pattern of the information recording medium of the present invention.

FIG. 9 is an explanatory view schematically showing a method of reading information of a magnetic information pattern of the information recording medium of the present invention.

10 is a reading waveform diagram showing a magnetic information pattern of the information recording medium of the present invention read by the reading method of FIG.

FIG. 11 is a plan view (a) showing a conventional information recording medium having magnetic unique information and a sectional view (b) taken along the line TT.

[Explanation of symbols]

 1, 6, 7 ... Information recording medium 2 ... Information recording section 2 ', 2 "... Magnetic recording section 3 ... Magnetic information pattern 3a ... Magnetic bar (magnetic code) 3b ... First track 3c ... Second track 3d ... Track 4 , 15 ... Concealment layer 5, 16 ... Protective layer 10 ... Information recording medium 11 ... Base material 12 ... Magnetic recording layer 13 ... Magnetic bar 14 ... Dummy bar 21 ... Magnetic head 22 ... Heating heater 23, 24 ... Writing waveform 25, 26 … Read waveform 31, 32… Oversheet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 5/02 G06K 19/00 R (72) Inventor Mie Arai 1-5 Taito, Taito-ku, Tokyo No. 1 Toppan Printing Co., Ltd.

Claims (5)

[Claims] 1. A low Curie point, which has a high coercive force at which writing with a magnetic head is substantially impossible at room temperature, and which can be written with a magnetic head by heating. An information recording medium comprising a magnetic information pattern as a magnetic code capable of magnetic recording, which comprises the magnetic recording material. 2. The magnetic recording material has a coercive force of 1 at room temperature.
The information recording medium according to claim 1, wherein the information recording medium is 0000 [Oe] or more. 3. The Curie point of the magnetic recording material is 15
The information recording medium according to claim 1, which has a temperature of 0 ° C. or lower. 4. The information recording medium according to claim 1, wherein a rewritable magnetic recording portion is provided on the base material. 5. The information recording medium according to any one of claims 1 to 4, wherein the magnetic information pattern is heated to a temperature at which writing by a magnetic head is possible, and the magnetic code of the magnetic information pattern is changed. Binarized information or ternary information is recorded while distinguishing the magnetization direction by a clock tuned to the cycle, and the recorded information is read by distinguishing the magnetization direction of the magnetic code from the magnetic information pattern at room temperature. And a method for recording and reproducing information on and from an information recording medium.