JPH02299893A - Card-shaped recording medium - Google Patents

Abstract

PURPOSE:To make alteration impossible by mounting the first recording member generating magnetic transformation from a ferromagnetic state to a non- magnetic state by the heating of a heat supply means and the second recording member generating magnetic transformation from a non-magnetic state to a ferromagnetic state by mechanical deformation. CONSTITUTION:By applying mechanical deformation to a data recording part 4 by rolling, embossing, punching or stamping due to a wire dot, the mechanical deformation applied part of the upper surface of the recording part 4 is changed to a ferromagnetic state 6 and this magnetic transformation can be magnetically read by a magnetic sensor such as a magnetic head or a reluctance element. Further, by controlling the radiation intensity of laser beam to a data recording part 2, three-value recording of a ferromagnetic part '2' not irradiated at all and generating no magnetic change, a part '1' transformed halfway and a part '0' perfectly transformed by strong energy can be performed. Timing data becoming necessary when the reading/writing of the data recording part 2 by laser beam separate from the laser beam used in the recording of the data recording part 2 is recorded on a data recording part 3 when a recording medium is published.

Description

[Detailed Description of the Invention] Purpose of the Invention; (Industrial Application Field) The present invention is applicable to prepaid cards, credit cards,
The present invention relates to a card-shaped recording medium, such as an IC card, on which necessary information is recorded or read.

(Prior Art) Conventionally, information recorded on a card-shaped recording medium, such as the remaining amount and the number of times the card has been used, has often been magnetically recorded on a magnetic stripe provided on the medium.

There was also a system in which a magnetic substance was embedded in a recording medium, the surface of which was covered with an invisible material, and the embedded magnetic substance was punched out each time the recording medium was used (for example,
6595).

(Problems to be Solved by the Invention) However, all of the information recorded on the recording medium may be easily tampered with. In other words, when recording on a magnetic stripe, the recorded information can be deciphered by collecting and analyzing the recorded information from multiple media.
Therefore, it is easy to give value to worthless media. Furthermore, in a recording medium such as that described in Japanese Patent Publication No. 48-16595, the value can be easily recovered by filling the punched hole with a magnetic material and gluing it. Furthermore, although IC cards are currently said to be highly secure, it is clear that they are not necessarily perfect.

The present invention has been made in view of the above points, and an object of the present invention is to produce a metal or alloy that undergoes a magnetic transformation from ferromagnetic to non-magnetic by heating, and a metal or alloy that undergoes magnetic transformation from non-magnetic to ferromagnetic by mechanical deformation. It is an object of the present invention to provide a card-shaped recording medium that cannot be tampered with by using metals or alloys that produce .

Structure of the Invention; (Means for Solving the Problems) The present invention relates to a card-shaped recording medium, and the above-mentioned object of the present invention is to provide a first recording medium that undergoes magnetic transformation from ferromagnetic to non-magnetic by heating with a heat supply means. This is achieved by comprising a second recording member that undergoes magnetic transformation from non-magnetic to ferromagnetic through mechanical deformation.

° (Function) When steel is quenched from the austenite region at a critical cooling rate or higher, martensite is obtained. The temperature at which martensite occurs is called 6 points, and it depends on the chemical composition of the steel. However, martensite may be induced even when unstable austenite is processed, and the temperature at which it occurs shifts to a higher temperature than the M6 point, but if it becomes much higher than the M point, martensite formation due to processing will not occur. This point is called the Md point, and the martensite formation caused by processing is called processing-induced transformation. In this case, stress is applied to process the austenite, which induces and progresses. As martensitic transformation progresses, large plasticity occurs, which is called transformation-induced plasticity (transformation-i).
ndu, ced plasticity, abbreviation TRIP
), and this transformation-induced plasticity is a type of superplasticity. That is, the austenite-martensitic transformation occurs during processing, and the stress concentration that caused the processing-induced transformation is alleviated by the occurrence of the transformation, resulting in considerably high ductility.

By the way, stainless steel is classified as shown in Table 1 below.

Also, austenitic stainless steel is 301, 304, 3
The stainless steel used in this invention is a stainless steel that has a metastable austenitic phase at room temperature, that is, the Md point is above room temperature, and the M point is below room temperature. It is. and rolled at room temperature.

By applying mechanical deformation such as embossing or punching holes to the austenitic stainless steel, a magnetic transformation occurs from non-magnetic austenite to ferromagnetic martensite, but this is irreversible unless heated to several hundred degrees Celsius or higher. Depending on the carbon content, it returns to non-magnetic state at about 400°C to 1000°C.

On the other hand, austenitic stainless steel undergoes magnetic transformation due to mechanical deformation below the Md point and becomes a ferromagnetic martensitic structure. When such steel is heated with a heat supply means such as a laser beam or a thermal head, it undergoes magnetic transformation and returns to a non-magnetic austenitic structure at room temperature.

FIG. 3 shows this situation. When the thermal head 11 is pressed against the surface of a card-shaped ferromagnetic martensitic austenitic stainless steel 10 and heated, the heated portion 12 becomes non-magnetic, and the non-magnetic The depth D of the curved portion depends approximately on the heating energy. Therefore, when the thermal hect 11 is moved over ferromagnetic stainless steel @10 while controlling its heating energy, information corresponding to the three-value (04°2) state is recorded, for example, as shown in Fig. 4. be able to. The same applies when a laser beam is used instead of the thermal head 11, and in the case of a laser beam, not only the energy but also the beam diameter and shape can be changed arbitrarily. In addition, Fig. 5 (A) shows the recess 21 of the austenitic stainless steel @20 by embossing.
FIG. 2B shows how the area around the punched hole 22 has become ferromagnetic. In this way, magnetic recording can be performed by forming a multivalued ring of non-magnetic portions on the ferromagnetic layer on the card or by forming ferromagnetic portions on the non-magnetic layer.

The present invention has a process-induced transformation as described above, in which a first metal or alloy undergoes a magnetic transformation from ferromagnetic to non-magnetic by heating, and a second metal or alloy undergoes a magnetic transformation from non-magnetic to ferromagnetic by mechanical deformation. A metal or an alloy is used as a card or a part of the card, and a magnetic recording layer such as a magnetic stripe is further provided as necessary.

(Example) Fig. 1 shows the appearance of a card-shaped recording medium 1 of the present invention, which has a rectangular card structure as a whole like a magnetic card etc., and is made of ferromagnetic martensitic austenitic stainless steel. Information recording sections 2 and 3 made of steel and information recording section 4 made of non-magnetic austenitic stainless steel are provided in a stripe shape. The information recording section 2 records main information such as the value 1 expiry date of the medium, and the information recording section 3 records timing information for timing detection at the time of writing/reading. The ^-A cross section is shown in Fig. 2, in which a thin plate 4 of austenitic stainless steel having a metastable austenite phase at room temperature as described above is layered on a card support 5 made of PET, paper, etc. It is set up. Therefore, by applying mechanical deformation to the information recording portion 4 such as rolling, embossing, punching holes, markings with wire dots, etc., the mechanically deformed portion of the thin plate 4 on the upper surface is shown in FIG. Since it is made into a ferromagnetic material as shown in (B), this magnetic transformation can be magnetically read by a magnetic sensor such as a magnetic head or a magnetoresistive element. FIG. 1 shows how the information recording section 4 is mechanically deformed at a plurality of locations to form a plurality of ferromagnetic sections 6. By controlling and recording the position and number of such ferromagnetic parts 6 and reading this, the remaining amount, the number of times of use, etc. can be detected. By controlling the irradiation intensity of the laser beam on the information recording section 2, for example, as shown in FIG. , it is possible to record the three-valued part "0" that has been completely transformed with strong energy. Information recording section 2
When the recording medium 1 is issued, timing information necessary for reading/writing the information recording section 2 is recorded in the information recording section 3 using a laser beam different from the laser beam recorded on the recording medium 1. Main information is simultaneously recorded in the information recording section 2 in synchronization with recording of timing information. Alternatively, only the timing information may be recorded in the information recording section 3 in advance, and the main information may be written into the information recording section 2 while detecting the timing information when the recording medium 1 is issued. Alternatively, the timing information may not be recorded on the recording medium I, but a timing signal may be obtained from a pulse motor drive pulse, a rotary encoder, etc. in synchronization with the conveyance of the recording medium 1.

FIG. 6 shows an example of a magnetic head 30 in which a primary coil 32 and a secondary coil 33 are wound around a magnetic core 31. The output V of the secondary coil 33 depends on whether it is in the magnetized part or the non-magnetized part. Since L12 is different, the information in the information recording section 2 can be read by this. Further, FIG. 7 shows an example of a magnetic head 40 for detecting ferromagnetism near the punch hole 4A when the information recording section 4 is conveyed in a direction perpendicular to the plane of the paper, and a magnetoresistive (MR) element 42 and 43 are connected in series, a DC bias DB is applied therebetween, and the magnets are magnetized by a permanent magnet 41. In this case, the MR element 42
acts as a canceller, and the output vo of the MR element 43
Since uT changes depending on the ferromagnetic portion near the punch hole 4^, the recorded information in the information recording section 4 can be read by this.

FIG. 8 shows an example of reading information from the information recording section 4 using the magnetic head 30, and FIG.
An example is shown in which the recording medium 1 is conveyed after being magnetized and read by a magnetic head 30A around which an output coil 33 is wound.

In this case, since the ferromagnetic part 4B is magnetized by the magnet 34, the ferromagnetic part 4B is magnetized by the magnetic head 34.
When the output coil 33 reaches the A position, the output voltage shear of the output coil 33 changes, and thereby the ferromagnetic portion 4B can be detected. Figures 1O to 12 show magnetoresistive elements (MR).
Fig. 10 shows an example of a detection device using a detection H element 70 and a cancellation MR element using an electromagnet 72.
In FIG. 11, one MR element 73 is placed in the magnetic field of an electromagnet 74 and is driven through a resistor 75. Also, the example in Figure 12 is 2
This is an example in which two MR elements 76 and 77 are separated via an electromagnet 78.

Next, information is written on the card-like recording medium 1,
An example of an information reading/writing device that reads information will be described.

Figure 13 (^) shows the side structure of the reading/writing section.
) shows its planar structure. The recording medium 1 is inserted from the insertion port 101 of the device, and the insertion is detected by the optical sensor PH1.
, and then taken into the interior by conveyance rollers 102 and 103 and the like. The recording medium 1 taken into the interior is further detected by an optical sensor PH2, and a punching means 104 for punching a hole in the information recording section 4 between the roller 102 and the optical sensor PH2; Light emitting means 10 for partially heating the information recording section 2 with a laser beam
5, and a magnetic sensor MR as shown in FIG. 7 for reading the recorded information of the information recording section 4;
Magnetic sensors MDI and Mn2 as shown in FIG. 6 are provided for reading the recorded information in the information recording sections 2 and 3. Note that recording of information in the information recording units 2 and 4 is as follows:
This is performed sequentially from the right side of the medium 1 to the left side in the figure, and the recording medium 1. The position of optical sensor PH1, PH
2 and a timing signal from the magnetic sensor MD2.

FIG. 14 is a block diagram showing the control system of the information reading/writing device, and the read signal from the magnetic sensor MDI is sent to the amplifier 1.
The signals 51 and S2, which are amplified in step 11 and input to the reading circuit 112 and binarized based on the thresholds T)II and TH2, are manually input to the first information storage means 110 and stored. The read signal from the magnetic sensor MD2 is sent to amplifier 1.
13 to the reading circuit 114, and the timing signal TS that has been shaped is sent to the first information storage means 110 and the second information storage means 110.
The information is input to the information storage means 120 and also to the control means 131 consisting of a CP port, etc.). Also, the read signal from the magnetic sensor MR is an amplifier! The signal S3 is amplified at 21, inputted to the reading circuit 122, and binarized based on the threshold T)13. The signal S3 is inputted to the second information storage means 12G and stored. Each information stored in the first information storage means 110 and the second information storage means 120 is stored in the determination means 1
3θ, the determination result DS is input to the control means 131, and the detection signals DTI and tlT2 of the optical sensors PH1 and PH2 are also input to the control means 131. The control means 131 controls the conveyance means 133 such as rollers 102 and 103, the perforation means 104, and also controls the light emitting means 1.05 via the beam control means 132. Further, if the recording medium 1 is genuine and can be used, the control means 131 outputs a completion signal 0 after the necessary information processing, performs the necessary processing, and then outputs a signal indicating the end of the operation. The FIN must be entered from another device.

In such a configuration, its operation is shown in FIGS. 15 to 17.
This will be explained with reference to each timing chart in the figure.

When the recording medium 1 is inserted into the insertion slot 10, it is detected by the optical sensor PH1, and the detection signal onj<is input to the control means 131, which causes the control means 131 to drive the conveyance means 133 and move the rollers 102 and 103. The recording medium 1 is taken into the apparatus by being rotated in the m direction. Note that when the detection signal DTI is input from the optical sensor P)+1, the control means 131 outputs a clear signal CL to clear the first information storage means 110 and the second information storage means 120.
Clear the previous information. When the leading edge of the recording medium 1 is detected by the optical sensor P) 12 and its detection signal DT2 is input to the control means 131, the information recording section 3 is provided with the relationship shown in FIG. 15(^). The read signal from the magnetic sensor MD2 is amplified by the amplifier 113 as shown in FIG. 2(B), and this read signal R5T is full-wave rectified by the reading circuit 114 as shown in FIG. 2(C). This full-wave rectified signal is compared with the threshold T)10 and is shown in Figure 15 (1).
) is converted into the timing signal TS, and the timing signal T
S is the first information storage means 110 and the second information storage means 12
It is input to 0. In addition, the magnetic sensor MDI is shown in Figure 16 (
For the ternary information in the information storage unit 2 as shown in A), the amplifier tti outputs a read signal R5F as shown in FIG. The read signal R5F is input to the read circuit 112 and integrated as shown in FIG. 16(C), and the threshold T
Signals Sl and S binarized by HI 'HL and 7112
2 is input to the first information storage means 110 and stored in accordance with the timing signal TS. Furthermore, the magnetic sensor MR as shown in FIG. 7 provided on the information recording section 4 is
For recorded information as shown in FIG. 17(A),
) and outputs the read signal R5R as shown in the read circuit 12.
2 is compared with the threshold TH3, a binarized signal S3 is obtained as shown in FIG.
The information is manually stored in the information storage means 120 according to the timing signal TS.

The recording medium 1 is conveyed while reading the information as described above, and when the rear end of the recording medium 1 is detected by the optical sensor P) 12 and the detection signal DT2 is inputted to the control means 131, the control means 131 stops the conveying means 133 and activates the determining means 130. The determining means 130 reads the information stored in the first information storage means 110 and determines whether the amount, expiration date, etc. are correct, and also reads the information stored in the second information storage means 120. , determines whether the frequency information exceeds the maximum number of uses and whether there is any remaining amount by subtracting it from the issued amount, and if it can be used, outputs the OH determination result DS to the control means 131. . If it cannot be used, the judgment result is NG.
S is inputted to the control means 131, and the rollers 102 and 103 are rotated in the n direction via the conveyance means 133, and the recording medium 1 is
return it and mark it as such, or use the perforation means 104 when returning it.
1 Record the invalidity with the light emitting means 105 and then return it in the same way. In addition, when the password is manually input, the determining means 130 compares it with the manual data and outputs 0 or NG.

When the control means 131 inputs a completion signal of 0 as the determination result DS, it performs a predetermined operation of the separately connected equipment,
To sell goods or provide services.

In the case of dispensing a single product, the return signal RN is input to the control means 131 at the time of dispensing the product, or when the payment button is pressed in the case of making it possible to purchase multiple products in various ways. The means 131 gives a return command to the conveying means 133 and retreats the recording medium 1. In this case, the recording medium 1 is returned to a predetermined position based on the timing signal TS obtained from the magnetic sensor MD2. Perforation means 10
4 to punch a hole in the information recording section 4. In addition, when recording the remaining amount etc. in the information recording section 2, the light emitting means 105 is controlled via the beam control means H2 based on the timing signal TS, and the irradiation intensity of the laser beam is controlled and laser heating is performed to perform necessary heating. Recording is performed, and then the recording medium 1 is returned. Here, recording is performed in the return direction of medium 1 (recording starts from the end of the information to be recorded this time, and control is performed so that the beginning of the information to be recorded this time is adjacent to the previous data) However, if it has a recording means, it will be installed inside, and the information will be recorded when the recording medium 1 is returned once (at this time, the leading edge of the medium has not come out from the insertion slot 101) and moved in the loading direction again, and then returned. It's okay.

(Modified example) In the above embodiment, the information recording parts 2 and 3 and the information recording part 4 are made of metal 1 alloy of different materials, but the amount of M (the amount of martensite) is adjusted in advance as shown in FIG. By adjusting, a recording medium with the functions of the above two metals and one alloy can be obtained with one metal or alloy. For example, if the M amount is adjusted, the M amount can be increased by punching. Let (
Reduce the amount of M in the LL force direction or by laser heating (
L2 direction). Ml is not limited to the position shown in FIG. 18, but may be set as appropriate. In addition to being attached to a card base material such as PET, this metal or alloy can also be formed on PET by vapor deposition or powder application, and furthermore, this metal or alloy itself can be formed into a card shape. It is possible. Furthermore, although the above embodiment has two information recording sections made of ferromagnetic martensitic austenitic stainless steel and non-magnetic austenitic stainless steel, as shown in FIG. magnetic stripe 5
1, an information recording section 52 made of ferromagnetic martensitic austenitic stainless steel, and an information recording section 53 made of non-magnetic austenitic stainless steel.
The card-shaped recording medium 50 may have the following.

Furthermore, in the above description, three-value recording is performed on the recording section made of ferromagnetic martensitic austenitic stainless steel, but it is also possible to record multi-value information of two values or four or more values. . It is also possible to provide a protective layer or an aesthetic layer on each recording member to make each recording layer invisible from the outside.

Note that the recording density can be much higher in ferromagnetic martensitic austenitic stainless steel than in non-magnetic austenitic stainless steel. Further, the carbon content of the information recording sections 2 and 3 is made non-magnetic at least at a relatively low temperature (for example, about 400 degrees Celsius), while the carbon content of the information recording section 4 is increased. It is also possible to make it non-magnetic unless the temperature is high (for example, around 1000° C.).

Effects of the invention: As described above, according to the card-shaped recording medium of the present invention, a non-magnetic portion can be formed by applying heat to ferromagnetic martensitic austenitic stainless steel, and the transformed non-magnetic portion has a strong Unless processed, it will not become ferromagnetic, and conversely, stainless steel that has been transformed into ferromagnetic through mechanical deformation of austenitic stainless steel will not return to its original non-magnetic state unless it is heated to over several hundred degrees Celsius. It is extremely difficult to return each recording member to its original state by subjecting it to severe processing or heating in the opposite manner to that used during recording, and tampering is virtually impossible. Each of the magnetic transformations described above cannot be seen from the outside and cannot be copied, so it is possible to obtain a card-shaped recording medium with extremely high safety.

[Brief explanation of the drawing]

Fig. 1 is an external view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-^, Fig. 3 is a drawing showing how ferromagnetic martensitic austenitic stainless steel is heated, and Fig. 4 The figure shows how magnetic transformation occurs due to heating, Figures 5 (^) and (B) respectively show how magnetic transformation occurs in non-magnetic material due to mechanical deformation, and Figure 6.
8 and 9 are structural diagrams showing an example of the magnetic head of the present invention, FIGS. 7 and 1G to 12 are diagrams showing an example of a detection device using a magnetoresistive element, respectively, and FIG.
Figure (^) is a side structural diagram of the reading/writing unit of the recording medium, Figure (B) is a planar structural diagram thereof, Figure 14 is a block configuration diagram showing the control system of the information reading/writing device, and Figure 15 is a block diagram showing the control system of the information reading/writing device. 17 are timing charts showing examples of the operation, FIG. 18 is a diagram for explaining still another embodiment of the present invention, and FIG. 19 is an external view showing an embodiment of the present invention. ! ... Card-shaped recording medium, 2,3.4 ... Information recording section, 30.40 ... Magnetic head, 31 ... Magnetic core, 34.41 ... Permanent magnet, 42.43 ... - MR element, 104... perforation means, 105... light emitting means, 1
10.120... Information storage means, 112°114.1
22... Reading circuit, 130... Judgment means, 131.
...control means. Applicant's agent Yasugata Yu Sanhaku /I2 Rei 2 Zujin 3 Figure (, 4) (B) Juku Q Zurei 6 Zuhi 7 Figure ototototototot (Δ) Mouth] 1 mouth CC) 33 Jin 16 Figure 2 Na 19 times

Claims (4)

[Claims] 1. It is characterized by comprising a first recording member that undergoes magnetic transformation from ferromagnetic to non-magnetic by heating by the heat supply means, and a second recording member that undergoes magnetic transformation from non-magnetic to ferromagnetic by mechanical deformation. A card-shaped recording medium. 2. 2. The card-shaped recording medium according to claim 1, wherein the first recording member and the second recording member are each layered in the form of a thin plate over a portion or the entire surface of a card substrate. 3. The card-shaped recording medium according to claim 2, wherein part or all of the surfaces of the first recording member and the second recording member are not visible from the outside. 4. The card-shaped recording medium according to claim 1, further comprising a magnetic recording layer.