JP4774767B2 - Magnetic wire - Google Patents

Description

  The present invention relates to a magnetic wire applied to a medium so that a medium such as paper can be remotely detected using the large Barkhausen effect, and in particular, a non-detection region by applying a force from the outside. The present invention relates to a magnetic wire in which different magnetic characteristics can be easily obtained by adopting a structure having a fracture region.

  In recent years, various methods and apparatuses for the purpose of strengthening security have been proposed, such as prevention of leakage of confidential information and personal information, and prevention of counterfeiting by illegal copying of securities and the like.

  As a technique for preventing forgery of securities or the like, there is a technique for creating a forgery-preventing sheet by inserting a magnetic wire into the sheet to give the sheet a characteristic that can identify the genuine article.

  For example, Patent Document 1 provides a paper in which a wire for shoplifting prevention in which a magnetic wire is wound is inserted between paper layers of a paper base material.

  In addition, with regard to magnetic wires, a large bulk generated in a magnetic wire is utilized by utilizing a phenomenon called the large Barkhausen effect, in which the direction of magnetization of the magnetic wire is reversed when the external magnetic field around the magnetic wire changes beyond a certain level. The Hausen effect is detected as a pulse output by a detection coil.

In Patent Document 2, a magnetic wire that can generate a large Barkhausen effect and a magnetic wire that does not generate a large Barkhausen effect are used, and two types of external magnetic fields for identification are applied to each magnetic wire. By using the fact that the signal generated from each magnetic wire is different due to the difference in the external magnetic field for identification, it has an identification function that can ensure a high level of security for the article to which each magnetic wire is attached. Articles and their identification methods have been proposed.
JP 2002-317398 A JP-A-11-306275

  As described above, a magnetic wire that generates a large Barkhausen effect is used in a method for enhancing security, but a magnetic wire that can easily obtain different magnetic characteristics by applying an external force has been proposed. It wasn't.

  Therefore, the present invention provides a magnetic wire that can easily obtain different magnetic characteristics by adopting a structure having a fracture region that becomes a magnetic non-detection region by applying a force from the outside. For the purpose.

In order to achieve the above object, the invention of claim 1 is a magnetic wire that is applied to a medium and is used for identification of the medium, and the density of the raw material is reduced at a desired location at an interval shorter than the magnetically detectable length. Breakage that has a structure in which different parts come into contact alternately, is cut at a part having a different density of the raw material by applying external force, and is cut shorter than a magnetically detectable length , and becomes a magnetically non-detectable area A region is provided.

The invention of claim 2 is a magnetic wire that is applied to a medium and is used for identification of the medium, wherein a desired portion includes a portion having a large diameter and a portion having a small diameter at intervals shorter than a magnetically detectable length. Has a structure that repeats alternately, and is cut at a location where the diameter is small by applying an external force, and is cut shorter than a length that can be detected magnetically, and has a fracture region that becomes a magnetic non-detection region. It is characterized by that.

The invention of claim 3 is a magnetic wire that is applied to a medium and used for identification of the medium, and has a structure in which notches are formed at desired locations at intervals shorter than the magnetically detectable length. In addition, it is characterized in that it includes a fracture region that is cut at the notch by applying an external force and shorter than a magnetically detectable length, and becomes a magnetic non-detection region .

According to a fourth aspect of the present invention, there is provided a magnetic wire that is applied to a medium and is used for identification of the medium, the first wire having magnetism at an interval shorter than a magnetically detectable length at a desired location. It has a twisted pair structure in which twists are formed with a second wire having no magnetism and higher strength than the first wire, and is cut at a position between the twists by the application of an external force. It is cut shorter than the length which can be detected magnetically, and has a fracture region which becomes a magnetic non-detection region .

Further, the invention of claim 5 is a magnetic wire which is applied to a medium and used for identification of the medium, and is provided with a porous portion at a desired position at an interval shorter than a magnetically detectable length. And having a rupture region that is cut at a porous portion by application of an external force and shorter than a magnetically detectable length, and becomes a magnetically non-detectable region. It is characterized by.

  According to the magnetic wire of the present invention, it is configured such that a desired region is provided with a fracture region that is cut shorter than a magnetically detectable length by applying an external force and becomes a magnetically non-detectable region. The magnetic wire has an effect of easily obtaining different magnetic characteristics.

  The magnetic wire according to the present invention is provided with the magnetic wire according to the present invention when confidential information is output by printing, copying, etc. for the purpose of preventing leakage of confidential information or personal information, or document management. When a force such as bending is applied to the paper on which the confidential information is printed, the specific area of the magnetic wire is destroyed and a magnetic wire having a preset length is formed. The information regarding the magnetic wire having a preset length is formed, and it is possible to prevent illegal copying and illegal taking-out and to prevent leakage of confidential information which is the content of the confidential document.

  Moreover, the magnetic wire according to the present invention is easily cut at the position of the breakage region of the magnetic wire when a force is applied to the magnetic wire by providing a breakage region at a desired position, and the magnetic wire is cut, Information corresponding to the length of the magnetic wire is formed.

When the magnetic wire is cut, the magnetic wire is cut to form a desired length of the magnetic wire so that desired magnetic characteristics can be obtained and desired information can be formed on the magnetic wire. .

  By forming desired information on the magnetic wire, confidential information can be managed more strictly.

  First, an image forming apparatus provided with a magnetic wire applying device for applying a magnetic wire according to the present invention will be described with reference to FIG.

  FIG. 1 is a configuration diagram showing a main part of an image forming apparatus 100 that creates a security document for the purpose of preventing leakage of confidential information by applying a magnetic wire according to the present invention to a sheet.

  The image forming apparatus 100 includes a paper feed tray 101, a transfer drum 102, an exposure device 103, a developing device 104, a photosensitive drum 105, a fixing device 106, a paper discharge tray 109, a cutting device 110, an operation panel 111, and a document reading device 112. ing.

  The paper feed tray 101 stores paper to which a magnetic wire according to the present invention is provided, and the paper to which the magnetic wire is provided is conveyed from the paper feed tray 101 to the cutting device 110 based on an instruction from the user through the operation panel 111. .

  The document reading device 112 reads a document to be copied to form image data, the exposure device 103 forms image data to be copied as an electrostatic latent image on the photosensitive drum 105, and the developing unit 104 forms on the photosensitive drum 105. The electrostatic latent image is developed to form a toner image, the transfer drum 102 transfers the toner image formed on the photosensitive drum 105 to a sheet, the fixing device 106 fixes the toner image transferred to the sheet, A paper discharge tray 109 discharges the paper to which the cut magnetic wire is attached.

  The image forming apparatus 100 is controlled in operation by a CPU (Central Processing Unit) (not shown), and the sheet to which the magnetic wire according to the present invention is applied is applied to the sheet by bending and pressing the sheet by the cutting apparatus 110. When a force is applied to the magnetic wire thus formed, the magnetic wire is cut by a broken region that is easily broken.

  The cutting device 110 will be described in detail later.

  In the magnetic wire according to the present invention, when a force is applied from the outside, the magnetic wire is cut at a break region disposed in the magnetic wire, whereby one magnetic wire is divided into a plurality of magnetic wires.

  And the sheet | seat with which the some magnetic wire divided | segmented was provided will be in the state to which the magnetic wire in which length differs from the magnetic wire before division | segmentation was provided.

  The coercive force of the magnetic wire differs according to the wire diameter and length of the magnetic wire, and is divided into a plurality of magnetic wires by cutting one magnetic wire applied to the paper at the break region. The magnetic wire has a coercive force corresponding to the length of the divided magnetic wire.

  The magnetic wire applied to the paper can be detected and detected by applying a predetermined alternating magnetic field to the magnetic wire with a detection device (not shown) to detect a steep magnetic pulse generated when the magnetic wire is reversed in magnetization. The detection time and detection output of the magnetic pulse are detected differently according to the magnetic force.

  From this, the detection signal of the magnetic pulse detected according to the coercive force of the magnetic wire cut and divided in the breaking region by adjusting the arrangement of the breaking region of one magnetic wire applied to the paper It is possible to provide information corresponding to.

  Next, a magnetic wire having information by being cut according to the present invention will be described with reference to FIG.

  FIG. 2 is a schematic view showing the magnetic wire 10 having information by being cut according to the present invention.

  The magnetic wire 10 is made of an Fe—Co-based amorphous material having characteristics of so-called large Barkhausen effect that is magnetized by receiving a magnetic field and emits a steep magnetic pulse at the time of magnetization reversal.

  As shown in FIG. 2A, the magnetic wire 10 is formed with a fracture region 11 configured to be easily broken by applying an external force to cut the magnetic wire.

  The rupture region 11 is a region that becomes a non-detection region magnetically when the rupture region 11 itself is cut shorter than a magnetically detectable length by applying a force such as bending or compression from the outside.

  There are various types of formation methods for the fracture region 11 and will be described in detail later.

  The magnetic wire 10 is cut in the fracture region 11 by applying a force from the outside by bending or compression, and one magnetic wire 10 is cut to a desired length.

  By cutting the magnetic wire to a desired length, information corresponding to the length of the magnetic wire after cutting is formed.

  FIG. 2B is a schematic diagram showing a plurality of magnetic wires 12, 13, 14 formed by being cut in the fracture region 11 by applying a force to the magnetic wire 10.

  As shown in FIG. 2 (b), when a force is applied to the magnetic wire 10 and it is cut at the fracture region 11, the magnetic wire 10 is divided to form a plurality of magnetic wires 12, 13, and 14.

  When a magnetic wire is detected magnetically, the magnetic coercive force of the wire differs depending on the length of the magnetic wire, so that the magnetic pulse generated when the large Barkhausen effect occurs is detected. Since the signals are different and the detection signal corresponding to the length of the magnetic wire is detected by the detection device, information corresponding to the length of the magnetic wire can be formed.

  Therefore, desired information can be formed by disposing the fracture region at a desired portion of the magnetic wire.

  Next, the paper 20 provided with the magnetic wire 10 according to the present invention will be described with reference to FIG.

  FIG. 3 is a schematic diagram showing the paper 20 provided with the magnetic wire 10.

  As shown in FIG. 3A, the magnetic wire 10 is applied to the paper 20 by an adhesive tape 21.

  Thus, since the magnetic wire 10 is applied to a medium such as a sheet to be detected by the adhesive tape 21, even if the magnetic wire 10 is cut in the fracture region 11, the magnetic wires 12, 13, 14 will not scatter.

  The sheet 20 shown in FIG. 3A is arranged on the sheet feeding tray 101 in the image forming apparatus 100, and the sheet 20 is conveyed to the cutting apparatus 110 based on an instruction from the user of the operation panel 111. When a force is applied to the magnetic wire at, the applied magnetic wire 10 is cut at the fracture region 11.

  FIG. 3B is a schematic diagram showing a state where the magnetic wire 10 applied to the paper 20 is divided into magnetic wires 12, 13, and 14.

  As shown in FIG. 3 (b), the sheet 20 is subjected to a force applied by the cutting device 110, whereby the magnetic wire 10 is cut at the breaking region 11 to form the magnetic wires 12, 13, and 14.

  By forming the magnetic wires 12, 13, and 14 in this way, the magnetic wires 12, 13, and 14 having different lengths are formed on the paper 20, and the magnetic wires have different lengths, thereby causing a large Barkhausen effect. Since the detection signals for detecting the magnetic pulses generated when the magnetic wire 12 is generated are different, the magnetic wires 12, 13, 14 having different lengths are arranged on the paper 20, so that Length specific information is recorded.

  Next, the cutting device 110 of the image forming apparatus 100 will be described with reference to FIG.

  FIG. 4 is a configuration diagram illustrating a main part of the cutting device 110 of the image forming apparatus 100.

  The cutting device 110 includes a roller 41, a roller 42, bending rollers 43 and 44, a paper insertion port 45, a paper discharge port 46, and a guide 47.

  The roller 41 is rotated by a motor (not shown), and the surface of the roller 41 is coated with rubber or the like so that the paper does not slip.

  The surface of the roller 42 is coated with rubber or the like so that the paper does not slip. The roller 41 and the roller 42 press the transported paper to apply force to the paper. The fracture area 11 is destroyed.

  The bending roller 43 applies a force to the paper 20 by bending the paper 20 inserted from the paper insertion opening 45, breaks the fracture region 11 of the magnetic wire 10, and conveys it to the roller 41.

  The bending roller 44 receives the conveyance of the sheet pressed by the roller 41 and bends the conveyed sheet, thereby applying a force to the sheet 20 to break the fracture region 11 of the magnetic wire 10 and the sheet discharge port 46. Eject paper.

  In addition, the guide 47 is bent by the bending roller 43, pressed by the roller 41 and the roller 42, bent by the bending roller 44, and discharged from the paper discharge port 46. Assist the transport of the paper.

  In the image forming apparatus 100, the sheet 20 conveyed from the sheet feeding tray 101 is inserted into the sheet insertion opening 45 of the cutting apparatus 110, bent by the bending roller 43, the broken area 11 is broken, and supported by the guide 47. After being transported to the contact point between the roller 41 and the roller 42 and being pressed by the roller 41 and the roller 42 at the contact point between the roller 41 and the roller 42, the fracture region 11 that was not destroyed by the bending roller 43 is destroyed. The paper 20 is conveyed to the bending roller 44 with the assistance of the guide 47 and bent by the bending roller 44, and the broken region 11 that was not broken by the bending roller 43, the roller 41, and the roller 42 is broken, and then the sheet 20 is The paper is discharged from the paper discharge port 46 and conveyed to the transfer drum 102 along the conveyance path.

  As described above, the cutting device 110 applies a force to the paper 20 by bending and pressing, thereby breaking the fracture region 11 of the magnetic wire 10 and cutting the magnetic wire 10 into the magnetic wires 12, 13, and 14.

  Next, in the image forming apparatus 100, a process for copying on a sheet provided with magnetic wires on which information is formed will be described with reference to FIG.

  FIG. 5 is a flowchart illustrating a process in which copying is performed on a sheet provided with magnetic wires on which information is formed in the image forming apparatus 100.

  In the image forming apparatus 100, when a user's copy instruction is received from the operation panel 111 (step 501), the sheet 20 to which the magnetic wire 10 before cutting is applied is conveyed from the paper feed tray 101 to the cutting apparatus 110 (step 501). 502).

  The paper 20 conveyed to the cutting device 110 is subjected to a force by bending, pressing, or the like inside the cutting device 110, and the breaking region 11 of the magnetic wire 10 applied to the paper 20 is broken, so that the magnetic wire 10 is magnetic. The wire 12, 13, 14 is cut (step 503).

  The sheet 20 on which the magnetic wire 10 is cut and the magnetic wires 12, 13, 14 are arranged inside the cutting device 110 has information unique to the length of the magnetic wires 12, 13, 14, and the transfer drum 102. It is conveyed to.

  On the other hand, the image forming apparatus 100 that has received a user's copy instruction forms image data to be copied in the document reading device 112, the exposure device 103 forms an electrostatic latent image on the photosensitive drum 105, and the developing device 104 is the photosensitive drum. The electrostatic latent image formed in 105 is developed to form a toner image.

  The paper 20 conveyed to the transfer drum 102 is transferred to the paper 20 by the transfer drum 102 and the toner image formed on the photosensitive drum 105 is transferred to the paper 20. Is formed (step 504).

  The sheet 20 on which the image is formed is discharged from the discharge tray 109 (step 505).

  Next, the fracture | rupture area | region 11 of the magnetic wire 10 which concerns on this invention is demonstrated with reference to an accompanying drawing.

  First, the fracture | rupture area | region 11 of the magnetic wire 10 has a structure cut | disconnected when force is applied to the magnetic wire 10 from the outside, As a kind of the structure, a twisted pair structure is demonstrated with reference to FIG. .

  FIG. 6 is a schematic diagram showing a fracture region 11 having a twisted pair structure.

  FIG. 6A shows a schematic diagram of the fracture region 11 of the twisted pair structure.

  The fracture region 11 is constituted by a twisted pair structure of a magnetic wire 60 and a wire 61.

  The magnetic wire 60 can generate a large Barkhausen effect with a certain magnetic field strength and forms a magnetic wire portion of the magnetic wire 10.

  That is, the broken region 11 is formed by the wire 61 entangled with a part of the magnetic wire 60 in a twisted pair structure.

  The wire 61 is a wire having a higher tensile strength than the magnetic wire 60.

  Due to the difference in tensile strength between the magnetic wire 60 and the wire 61 due to the force applied by bending or the like, the magnetic wire 60 is positioned between the twisted pairs of the twisted pair structure as shown in FIG. When the wire 60 is cut, the magnetic wire 10 is cut by the fracture region 11.

  Moreover, you may make it fix each twist to which the magnetic wire 60 of the twisted pair structure and the wire 61 cross | intersect with an epoxy resin etc. so that the magnetic wire 61 may be cut | disconnected easily.

  Next, as a type of the fracture region 11, the fracture region 11 configured by forming notches will be described with reference to FIG.

  FIG. 7 is a schematic view showing a fracture region 11 formed by forming notches in the magnetic wire.

  FIG. 7A shows a schematic diagram of the fracture region 11 formed by forming the notches.

  As shown in FIG. 7A, the break region 11 of the magnetic wire is formed by forming a notch in the magnetic wire, and when a force is applied to the magnetic wire from the outside by bending or the like, FIG. As shown in (b), the fracture region 11 in which the score 50 is formed is in a state of being broken, and the fracture region 11 serves to cut the magnetic wire into a desired length.

  The notch formed on the magnetic wire is formed on the magnetic wire by, for example, fine laser processing.

  Next, as a type of the fracture region 11, the fracture region 11 constituted by the size of the wire diameter will be described with reference to FIG.

  FIG. 8 is a schematic view showing a fracture region 11 constituted by the size of the wire diameter of the magnetic wire.

  FIG. 8A shows a schematic diagram of the fracture region 11 configured by the size of the wire diameter of the magnetic wire.

  As shown in FIG. 8 (a), this magnetic wire is configured so that a portion having a large wire diameter and a portion having a small wire diameter are alternately changed, and when a force is applied from the outside by bending or the like, As shown in FIG. 8 (b), the magnetic wire is cut from the portion where the wire diameter is small, and the magnetic wire is cut by the fracture region 11.

  As described above, when the portion of the magnetic wire having a small wire diameter is cut, the fracture region 11 constituted by the large or small wire diameter serves to cut the magnetic wire to a desired length.

  In addition, in order to form the fracture | rupture area | region 11 comprised by the magnitude of such a wire diameter, when processing a Fe-Co-type material by wire drawing by a drawing process, for example, the strength is given to tensile strength. This is done by pulling the wire.

  Moreover, when processing by an extrusion process, the fracture | rupture area | region 11 in which the part with a large wire diameter and a small part is repeated alternately is formed by repeating the strength to a pressing pressure.

  Next, as a type of the fracture region 11, the fracture region 11 in which a portion that is likely to be cut due to a difference in concentration of Fe—Co-based material is formed will be described with reference to FIG. 9.

  FIG. 9 is a schematic diagram showing a fracture region 11 in which a portion that is easily cut due to a difference in concentration of Fe—Co that is a material of the magnetic wire is formed.

  FIG. 9A shows a method of manufacturing a fracture region 11 in which a portion that is easily cut by a difference in the concentration of the magnetic wire material is formed, and a fracture region 11 in which a portion that is easily cut by the magnetic wire concentration difference is formed. The schematic diagram with a part of example is shown.

  As shown in FIG. 9A, in the fracture region 11, the portions having a difference in the Fe—Co concentration of the material are alternately arranged, and the portions having the difference in concentration have a difference in density as a material coefficient. When a force is applied from the outside due to bending, compression or the like, as shown in FIG. 9 (b), the portions where materials having different concentrations are in contact with each other are cut.

  For example, the difference in concentration may be such that the Fe—Co content is 80% and 20%.

  FIG. 9C is a schematic diagram of a part of an example of a method for manufacturing the fracture region 11 in which a portion that is easily cut due to a difference in the concentration of the magnetic wire material is formed.

  As shown in FIG. 9 (c), two types of metal pastes having different concentrations are formed from Fe—Co, which is a raw material of the magnetic wire, and the respective metal pastes are packed in different containers 93, 94, and the paste switching valve 95 is formed. , 96 are switched, and a columnar metal paste having a density difference is alternately ejected from the ejection port 97.

  The fracture region 11 is formed by the metal paste injected from the injection port 97.

  Next, as the type of the fracture region 11, the fracture region 11 formed by a porous material in which a gas is mixed in a magnetic wire will be described with reference to FIG.

  FIG. 10 is a schematic view showing a fracture region 11 formed of a porous material in which a gas is mixed in a magnetic wire.

  FIG. 10A shows a schematic diagram of a fracture region 11 formed by a porous material in which a gas is mixed in a magnetic wire.

  As shown in FIG. 10 (a), the fracture region 11 of the magnetic wire has a porous portion mixed with gas, and a force is applied to the magnetic wire from the outside by bending, pressing, or the like. When added, as shown in FIG. 10 (b), the fractured region 11 is cut by breaking the porous portion.

  When the breaking region 11 is cut, the breaking region 11 serves to cut the magnetic wire into a desired length.

  The method of applying the magnetic wire according to the present invention to a medium such as paper is not limited to the method of applying with an adhesive tape, but other methods such as the method of papering the magnetic wire according to the present invention at the time of paper making. Of course, the method is fine.

  The present invention can be used in a magnetic wire applied to a medium so that a medium such as a sheet can be remotely detected using the large Barkhausen effect.

  The magnetic wire of the present invention can easily obtain different magnetic characteristics by applying a force from the outside by adopting a structure having a fracture region that becomes a non-detection region by applying a force from the outside.

1 is a configuration diagram showing a main part of an image forming apparatus 100 that creates a security document capable of preventing leakage of confidential information by providing a magnetic wire according to the present invention to a sheet. The schematic diagram which showed the magnetic wire 10 which has information by being cut | disconnected based on this invention. The schematic diagram which shows the paper 20 to which the magnetic wire 10 was provided. FIG. 3 is a configuration diagram illustrating a main part of a cutting device 110 of the image forming apparatus 100. 6 is a flowchart illustrating processing in which copying is performed on a sheet provided with a magnetic wire on which information is formed in the image forming apparatus 100. The schematic diagram which shows the fracture | rupture area | region 11 which has a twisted pair structure. The schematic diagram which showed the fracture | rupture area | region 11 comprised by a notch being formed in a magnetic wire. The schematic diagram which showed the fracture | rupture area | region 11 comprised by the magnitude of the wire diameter of a magnetic wire. The schematic diagram which shows the fracture | rupture area | region 11 in which the location which becomes easy to cut | disconnect by the density | concentration difference of Fe-Co which is a material of a magnetic wire was formed. The schematic diagram which shows the fracture | rupture area | region 11 formed with the porous in which gas is mixed in a magnetic wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic wire 11 Breaking area 12 Magnetic wire 13 Magnetic wire 14 Magnetic wire 20 Paper 21 Adhesive tape 41 Roller 42 Roller 43 Bending roller 44 Bending roller 45 Paper insertion port 46 Paper discharge port 47 Guide 60 Magnetic wire 61 Wire 50 Notch 93 Container 94 Container 95 Paste switching valve 96 Paste switching valve 97 Injection port 100 Image forming apparatus 101 Paper feed tray 102 Transfer drum 103 Exposure device 104 Developer 105 Photosensitive drum 106 Fixing device 109 Paper discharge tray 110 Cutting device 112 Document reading device 111 Operation panel

Claims (5)

A magnetic wire attached to a medium and used to identify the medium,
It has a structure in which parts with different raw material densities are alternately contacted at desired locations at intervals shorter than the magnetically detectable length, and is cut at the different parts of the raw material density by applying external force. A magnetic wire comprising a fracture region that is cut shorter than a detectable length and becomes a magnetically non-detectable region. A magnetic wire attached to a medium and used to identify the medium,
A desired location has a structure in which a location having a large diameter and a location having a small diameter are alternately repeated at an interval shorter than the magnetically detectable length, and is cut at the location having the small diameter by applying an external force. Fractured area that is cut shorter than the length that can be detected and is magnetically non-detectable
A magnetic wire comprising: A magnetic wire attached to a medium and used to identify the medium,
It has a structure in which notches are formed at desired locations at intervals shorter than the length that can be detected magnetically, and is cut at the notches by the application of external force to be shorter than the length that can be detected magnetically. , Fracture area that becomes magnetic non-detection area
A magnetic wire comprising: A magnetic wire attached to a medium and used to identify the medium,
Twists were formed at a desired location between the first wire having magnetism and the second wire having no magnetism and having a strength higher than that of the first wire at an interval shorter than the magnetically detectable length. A rupture region that has a twisted pair structure, is cut at a position between the twists by application of an external force, and is cut shorter than a magnetically detectable length, and becomes a magnetic non-detection region
A magnetic wire comprising: A magnetic wire attached to a medium and used to identify the medium,
It has a structure with porous portions at a desired location at intervals shorter than the magnetically detectable length, and is cut at the porous locations by applying an external force to magnetically Fracture area that is cut shorter than detectable length and becomes magnetic non-detection area
A magnetic wire comprising:

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