JP2005209010A - Medium identification method using magnetic tag and magnetic tag-provided medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium identification method using a magnetic tag for identifying a magnetic tag-formed medium based on a resonance frequency evolving magnetostrictive vibration by receiving an alternating magnetic field by the magnetic tag formed on the medium by changing a bonded area between an amorphous magnetostrictive element and the medium; and to provide a magnetic tag-provided medium. <P>SOLUTION: The medium identification method using the magnetic tag provides the magnetic tag consisting of at least one magnetostrictive element on the medium and reads tag information on the magnetic tag based on the resonance vibration frequency of the magnetostrictive element in the specified alternating magnetic field. At least part of the magnetostrictive element forming the magnetic tag is anchored on the medium. Varying the area of a fixed section fixing the magnetostrictive element to the medium changes the resonance vibration frequency of the magnetostrictive element in the specified alternating magnetic field. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a medium identification method using a magnetic tag and a medium to which a magnetic tag is attached, and in particular, a magnetic tag formed on a medium by changing the area of a fixing portion for fixing an amorphous magnetostrictive element to the medium is alternating. The present invention relates to a medium identification method using a magnetic tag for identifying a medium on which a magnetic tag is formed based on a resonance vibration frequency that undergoes magnetostrictive vibration in response to a magnetic field, and a medium provided with the magnetic tag.

  2. Description of the Related Art In recent years, there have been provided devices and methods for forming tags that record information on merchandise, paper, and other media, and transferring and receiving tag information formed on these media in a contactless or remote manner.

  For example, in a store that handles merchandise such as goods, a tag is affixed to the merchandise goods in order to prevent theft of the merchandise, and the merchandise with the tag attached is installed in a gate shape near the entrance of the store There is a system to prevent shoplifting theft by detecting the status of these tags with 1-bit ON / OFF when they pass the tag detection device and judging whether they have been cleared.

  In addition, IC cards that transmit and receive RF band electromagnetic waves via an antenna connected to an IC chip are also provided so that more information can be exchanged.

  However, this IC card can handle a large amount of information, but its application is limited by the manufacturing cost, the size of the IC card, and the like.

  In view of this, a method and apparatus have been proposed that uses a magnetostrictive element as a tag that can exchange information in a non-contact manner and can express more information than 1-bit ON / OFF.

For example, as shown in Patent Literature 1, Patent Literature 2, and Patent Literature 3, an amorphous magnetostrictive ribbon that is a magnetostrictive element is used, and an information recording medium in which a large amount of information can be set by the resonance frequency of the amorphous magnetostrictive ribbon, Data tag devices have been proposed.
Japanese Patent Application Laid-Open No. 08-293010 JP 08-293012 A Japanese Patent Laid-Open No. 10-143618

  By the way, in the patent document shown above, in order to increase the amount of information obtained by the resonance frequency of the amorphous magnetostrictive ribbon, for example, in Patent Document 1, a plurality of amorphous magnetostrictive ribbons having substantially the same length and different widths are used. In Patent Document 2, the amorphous magnetostrictive ribbon is provided with a load means for controlling the magnetostrictive vibration to change the resonance frequency. In Patent Document 3, the amorphous magnetostrictive ribbon is magnetized. As a configuration in which the magnitude of the bias magnetic field according to the pattern is made different, each can express a larger amount of information.

  Both of these proposals are inventions that can express more information associated with changes in the resonance frequency when a high permeability magnetostrictive member is loaded in a support body so as to vibrate. A high-permeability magnetostrictive member is formed on such a thin medium, and a plurality of media such as paper on which the high-permeability magnetostrictive member is formed are overlapped to detect the high-permeability magnetostrictive member formed on each medium. Thus, there is no disclosure of a method for expressing information that makes it possible to specify a medium.

  Therefore, the present invention relates to a medium identification method using a magnetic tag and a medium provided with a magnetic tag, and in particular, a magnetic tag formed on a medium by changing the area of a fixing portion for fixing an amorphous magnetostrictive element to the medium. It is an object of the present invention to provide a medium identification method using a magnetic tag for identifying a medium on which a magnetic tag is formed based on a resonance vibration frequency that undergoes magnetostrictive vibration in response to an alternating magnetic field, and a medium provided with the magnetic tag.

  In order to achieve the above object, a first aspect of the present invention provides a magnetic tag comprising at least one magnetostrictive element on a medium, and the tag of the magnetic tag is based on a resonance vibration frequency of the magnetostrictive element in a predetermined alternating magnetic field. In the medium identification method using the magnetic tag for reading information, at least a part of the magnetostrictive element forming the magnetic tag is fixed on the medium, and the areas of the fixing portions for fixing the magnetostrictive element to the medium are made different. To change the resonant vibration frequency of the magnetostrictive element in the predetermined alternating magnetic field.

  According to a second aspect of the present invention, in the first aspect of the invention, the magnetostrictive element includes a plurality of magnetostrictive elements, and the tag information is read based on a frequency pattern of resonance vibration of the plurality of magnetostrictive elements. Features.

  The invention of claim 3 is characterized in that, in the invention of claim 2, the plurality of magnetostrictive elements have the same shape and different areas of fixing portions of the magnetostrictive elements.

  The invention of claim 4 is characterized in that, in the invention of claim 2, at least one of the plurality of magnetostrictive elements has a different shape.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the tag information is read based on part of a frequency pattern of resonance vibration of the plurality of magnetostrictive elements.

  According to a sixth aspect of the present invention, a magnetic tag comprising at least one magnetostrictive element is provided, and a magnetic tag identified by tag information of the magnetic tag read based on a resonance vibration frequency of the magnetostrictive element in a predetermined alternating magnetic field. In the medium to which the tag is attached, at least a part of the magnetostrictive element forming the magnetic tag is fixed on the medium, and the predetermined alternation is made by changing the area of the fixing portion for fixing the magnetostrictive element to the medium. The resonant vibration frequency of the magnetostrictive element in a magnetic field is changed.

  According to a seventh aspect of the invention, in the sixth aspect of the invention, the magnetostrictive element comprises a plurality of magnetostrictive elements, and the tag information is read based on a frequency pattern of resonance vibration of the plurality of magnetostrictive elements. Features.

  The invention of claim 8 is characterized in that, in the invention of claim 7, the plurality of magnetostrictive elements have the same shape and different areas of fixing portions of the magnetostrictive elements.

  The invention of claim 9 is characterized in that, in the invention of claim 7, at least one of the plurality of magnetostrictive elements has a different shape.

  According to a tenth aspect of the present invention, in the invention according to any of the sixth to ninth aspects, the tag information is read based on a part of a frequency pattern of resonance vibration of the plurality of magnetostrictive elements.

  According to the medium identifying method using the magnetic tag and the medium provided with the magnetic tag according to the present invention, the magnetic tag including at least one magnetostrictive element is provided on the medium, and the resonance of the magnetostrictive element in a predetermined alternating magnetic field is provided. In a medium identification method using a magnetic tag that reads tag information of the magnetic tag based on a vibration frequency, at least a part of the magnetostrictive element forming the magnetic tag is fixed on the medium, and the magnetostrictive element is fixed to the medium. Since the resonance vibration frequency of the magnetostrictive element in the predetermined alternating magnetic field is changed by changing the area of the fixed portion to be fixed, the magnetostrictive element is fixed to the medium even if the magnetic tag has the same shape. More information can be identified corresponding to the area of the fixed part.

  In addition, even when the medium to which the magnetic tag is attached is superposed, the information of the magnetic tag attached to each medium can be read and the uniqueness of each medium can be specified.

  The medium identification method using the magnetic tag according to the present invention and the medium to which the magnetic tag is attached include, for example, an envelope, a case, etc. as a set of a plurality of types of documents having different contents, such as when direct mail is delivered. A medium identification method and a magnetic tag using a magnetic tag that can be detected in a non-contact manner without opening whether or not to forget to put a plurality of types of documents to be put in an envelope or case etc. It can be used as a given medium.

  For example, in this embodiment, a plurality of originals with a magnetic tag according to the present invention are stored as a set in an envelope, and each original stored in the envelope without contact from the outside of the envelope is a document. A medium identification method and a magnetic tag using the magnetic tag according to the present invention, which are assumed to be specified using a confirmation device to confirm whether or not all originals constituting one set are stored in an envelope. It shows about the medium to which is given.

  FIG. 1 is a diagram showing an overall configuration of an example document confirmation apparatus to which a medium identification method using a magnetic tag according to the present invention and a medium to which a magnetic tag is attached are applied.

  FIG. 1A is a schematic plan view of the document confirmation apparatus 100, and FIG. 1B is a side view corresponding to the plan view shown in FIG.

  In FIG. 1, a document checking apparatus 100 stores a plurality of types of originals having different contents created using a medium with a magnetic tag according to the present invention as a set in an envelope and seals it from the outside of the envelope. It is used as an apparatus for confirming whether or not a document to be put in an envelope without contact is forgotten by the medium identifying method using the magnetic tag according to the present invention.

  As shown in FIG. 1, a plurality of documents (not shown) stored in the envelope 4 are arranged so that the document confirmation apparatus 100 can detect the type of the document stored in the envelope 4 in a non-contact manner. A magnetic tag (not shown) that can identify the original of the original is formed, and the original on which the magnetic tag is detected is identified by detecting the magnetic tag from the outside of the envelope 4 in a non-contact manner. The type of document stored in the envelope 4 can be detected without opening.

  The configuration of the document confirmation apparatus 100 includes a detection apparatus 1 that detects a magnetic tag formed on a document existing in the envelope 4, and the envelope 4 that is detected based on the detection result detected by the detection apparatus 1. The transport mechanism device 3 (portion surrounded by a one-dot chain line) for transporting to any one of the envelope delivery boxes 33 and the computer 2 that performs overall control of the document confirmation device 100 are configured.

  The transport mechanism device 3 includes a transport belt 30, a gate 31 and a gate control device 32 that controls opening and closing of the gate 31, an envelope collection box 34, and an envelope delivery box 33.

  The conveying belt 30 is moved in a predetermined direction (see an arrow 35 in the figure) by a driving device (not shown), and the envelope 4 placed on the delivery belt 30 is allowed to pass substantially immediately below the detecting device 1. 1 is conveyed to the envelope collection box 34 or the envelope delivery box 33 based on the detection result 1.

  A plate-like gate 31 is disposed in the vicinity of the exit of the detection device 1 of the conveying belt 30, and this gate 31 opens and closes according to the detection result of the detection device 1 and a command instruction from the computer 2, and the envelope 4 is enveloped. It is guided to be transported to either the collection box 34 or the envelope delivery box 33.

  For example, the detection device 1 detects a magnetic tag formed on each document stored in the envelope 4 conveyed almost directly below the detection device 1, and the detection device 1 stores the magnetic tag in the envelope 4 based on the detected magnetic tag information. It is determined whether or not all the originals constituting one set are stored in a plurality of types of originals.

  The determination as to whether or not all types of originals constituting one set with a plurality of types of originals are stored in the envelope 4 is made for each of the plurality of types of originals constituting one set registered in advance. When the information on the magnetic tag (hereinafter referred to as “reference information”) and the information on the magnetic tag detected by the detection device 1 (hereinafter referred to as “detection information”) all match, the detected envelope 4 is detected. If all the documents constituting one set are stored in a plurality of types of documents, it is determined that there is no document forgotten to put, and if the reference information and the detection information do not all match, the detected envelope 4 If there is a forgotten manuscript, it is determined that “forgotten manuscript”.

  When the detection device 1 determines that “there is no forgotten original”, this determination signal is input to the computer 2, and the computer 2 instructs the gate control device 32 to open the gate 31, and the gate control device 32. Thus, the gate 31 is controlled to be open.

  When the detection device 1 determines that “there is a forgotten document”, this determination signal is input to the computer 2, and the computer 2 instructs the gate control device 32 to close the gate 31 for gate control. The gate 31 is controlled to be closed by the device 32.

  When the gate 31 is controlled to be closed, the plate-like gate 31 is closed by a predetermined angle δ with respect to the conveying direction of the conveying belt 30 (see the arrow 35 in the figure), so that the envelope 4 is attached to the conveying belt 30. As it moves, it is conveyed to and stored in the envelope collection box 34.

  Further, when the gate 31 is controlled to be in the open state, the plate-like gate 31 is stored in a predetermined position in a state parallel to the conveyance direction of the conveyance belt 30 (see the arrow 35 in the figure). As the belt 30 moves, the envelope 4 is conveyed to and stored in the envelope delivery box 33.

  In the envelope 4 stored in the envelope delivery box 33, all the originals constituting one set with a plurality of types of originals are properly stored, so that the delivery person collects and delivers them and stores them in the envelope recovery box 34 Since the envelope 4 is in an incomplete state in which there is a forgotten original document, after opening the envelope 4, the forgotten original document is stored in the envelope 4 and again confirmed by the document confirmation apparatus 100 and then delivered.

  By the way, a plurality of originals constituting one set stored in the envelope 4 described above are provided with magnetic tags corresponding to identification information for identifying the originals.

  The magnetic tag is formed of an amorphous magnetostrictive element and is adhered and fixed to each document.

  For example, when a predetermined magnetic field is applied to the amorphous magnetostrictive element, the amorphous magnetostrictive element is distorted. When the amorphous magnetostrictive element is placed in an alternating magnetic field having a predetermined frequency, the amorphous magnetostrictive element resonates with the frequency of the alternating magnetic field. Thus, it has a magnetostrictive characteristic that causes magnetostrictive vibration.

  Conversely, when an external force is applied to the amorphous magnetostrictive element having the magnetostrictive characteristic to change the size, the magnetization state of the amorphous magnetostrictive element changes, and the amorphous magnetostrictive element in a state of magnetostrictive vibration is changed. An electromagnetic wave corresponding to the frequency of the magnetostrictive vibration is emitted.

  As described above, the magnetic tag of the amorphous magnetostrictive element having the magnetostrictive characteristic is formed on the original stored in the envelope 4 in correspondence with the identification information unique to the original so that it can be detected without contact from the outside of the envelope. Therefore, the detection apparatus 1 of the document confirmation apparatus 100 transmits an alternating magnetic field having a predetermined frequency to the envelope 4 conveyed almost directly below the detection apparatus 1 by the conveying belt 30, and is transmitted into the envelope 4 by the transmitted alternating magnetic field. An electromagnetic wave emitted from a magnetic tag of an existing amorphous magnetostrictive element is detected.

  FIG. 2 is a block diagram schematically showing a detection device 1 for detecting a magnetic tag of an amorphous magnetostrictive element formed corresponding to document-specific identification information, and FIG. 3 is a detection device shown in FIG. 2 is a diagram illustrating an example of a detection signal obtained by detecting a magnetic tag formed of amorphous magnetostrictive elements having different lengths according to 1. FIG.

  A method for detecting the magnetic tag of the amorphous magnetostrictive element will be described with reference to FIGS.

  As illustrated in FIG. 2, the detection device 1 includes an alternating magnetic field generation unit 211 that generates an alternating magnetic field having a predetermined frequency, a transmission coil 212 that transmits the alternating magnetic field generated by the alternating magnetic field generation unit 211, and a transmission coil 212. A receiving coil 213 that receives an electromagnetic wave generated by magnetostriction vibration of an amorphous magnetostrictive element magnetic tag 201 (hereinafter referred to as “magnetic tag 201”) formed and applied on the original 200 in response to an alternating magnetic field transmitted via A timing control is performed in which an alternating magnetic field having a predetermined frequency is transmitted after being transmitted for a certain period of time via the transmission coil 212, and an electromagnetic wave generated by magnetostriction vibration of the magnetic tag is received via the reception coil 213 during the transmission stop period of the alternating magnetic field. Based on the signals received by the timing control unit 216 and the receiving coil 213, it resonates with an alternating magnetic field having a predetermined frequency and vibrates magnetostrictively. It is composed of a signal detection unit 214 and the frequency analysis unit 215 detects the resonant frequency of the magnetic tag.

  The document 200 is disposed between the transmission coil 212 and the reception coil 213 of the detection apparatus 1, and the alternating magnetic field generation unit 211 generates an alternating magnetic field in which the frequency is linearly changed from a low frequency to a high frequency to generate the transmission coil 212. To the original 200 via

  The magnetic tag 201 formed on the original 200 resonates and distorts due to an alternating magnetic field having a predetermined frequency transmitted via the transmission coil 212, and vibrates magnetostrictively.

  Note that the resonance frequency at which the amorphous magnetostrictive element receives an alternating magnetic field of a predetermined frequency and magnetostrictively vibrates is determined by the material and size of the amorphous magnetostrictive element. Therefore, the amorphous magnetostrictive element corresponds to the material and size of the amorphous magnetostrictive element. When receiving an alternating magnetic field having a specific resonance frequency, it shows a distortion having the largest amplitude, vibrates magnetostrictively, and emits an electromagnetic wave.

  The magnetostrictive vibration of the amorphous magnetostrictive element is continued while converging for a certain period of time even when transmission of the alternating magnetic field is stopped.

  The timing control unit 216 stops the alternating magnetic field having a predetermined frequency after being transmitted through the transmission coil 212 for a certain period, and stops the electromagnetic wave generated by the magnetostrictive vibration of the magnetic tag 201 through the receiving coil 213 during the transmission stop period of the alternating magnetic field. Perform timing control to receive.

  The reception signal received by the reception coil 213 is frequency-analyzed by the signal detection unit 214 and the frequency analysis unit 215, and the resonance characteristic of the magnetic tag 201 formed on the original 200 is the frequency when the current signal flowing through the reception coil is maximum. It is detected as a frequency.

  Using the detection apparatus 1 configured as described above, an alternating magnetic field having a predetermined frequency is transmitted to the original 200, and a resonance frequency due to magnetostriction vibration of the magnetic tag 201 detected from the original 200 is detected, thereby forming the original 200. It is possible to specify the magnetic tag.

  As described above, the resonance frequency due to the magnetostrictive vibration of the amorphous magnetostrictive element is determined by the material and size of the amorphous magnetostrictive element, and has the material and size corresponding to the resonance frequency from the detected resonance frequency of the amorphous magnetostrictive element. The amorphous magnetostrictive element can be specified.

  3, FIGS. 3A to 3C show amorphous magnetostrictive elements 1M311 (hereinafter referred to as “magnetostrictive element 1M311”) and 2M312 (hereinafter referred to as “magnetostrictive”) formed in the shape of thin thin foils having different lengths. 3D (hereinafter referred to as “element 2M312”) and 3M313 (hereinafter referred to as “magnetostrictive element 3M313”). FIG. 3D to FIG. It is a figure which shows the resonant frequency characteristic peculiar to each magnetostrictive element which 1M311, 2M312 and 3M313 received the alternating magnetic field of a predetermined frequency, and magnetostrictively vibrated.

  As described above, each of the magnetostrictive elements 1M311, 2M312 and 3M313 has a so-called magnetostrictive characteristic that causes a dimensional change when a magnetic field is applied from the outside.

  In FIGS. 3A to 3C, the numerical values 1, 2, and 3 of the magnetostrictive elements 1M311, 2M312 and 3M313 are attached to identify a plurality of magnetostrictive elements having different lengths. The magnetostrictive elements 1M311, 2M312, and 3M313 are all the same in composition, thickness, and width, and are long in the order of 1M <2M <3M.

  As shown in FIGS. 3A to 3C, the originals 301, 302, and 303 on which the magnetostrictive elements 1M311, 212, and 3M313 having different lengths are formed are the transmission coils 212 of the detection apparatus 1 shown in FIG. And the receiving coil 213, respectively, while changing the frequency of the alternating magnetic field sequentially from, for example, a low frequency to a high frequency, the alternating magnetic field is stopped after transmission for a certain period, and each original 301, When the electromagnetic waves emitted from the magnetostrictive elements 1M311, 2M312 and 3M313 formed in 302 and 303 are received and subjected to frequency analysis, the magnetostrictive elements 1M301, 2M302 and 3M303 as shown in FIGS. Resonance frequencies due to magnetostrictive vibration can be detected as waveform signals D, E, and F.

  The waveform signals D, E, and F are obtained as a result of frequency analysis of each frequency when the magnetostrictive elements 1M311, 2M312 and 3M313 receive electromagnetic waves and the current flowing through the receiving coil reaches a peak. A waveform signal D in FIG. 3D indicates that the resonance frequency of the magnetostrictive element 1M311 is f4, and a waveform signal E in FIG. 3E indicates that the resonance frequency of the magnetostrictive element 2M312 is f2. The waveform signal F in FIG. 3 (f) indicates that the resonance frequency of the magnetostrictive element 3M313 is f1.

  In this way, an alternating magnetic field that sequentially changes from a low frequency to a high frequency or from a high frequency to a low frequency is applied to the magnetic tag formed by each of the magnetostrictive elements 1M311, 2M312 and 3M313 having magnetostrictive characteristics, and the magnetostrictive vibration of the magnetostrictive element. By detecting the electromagnetic wave emitted by the sensor and detecting the resonance frequency, it is possible to specify the magnetostrictive element corresponding to the detected resonance frequency.

  In the example of FIG. 3, an example of a document in which one magnetic tag is formed by one magnetostrictive element is shown, but a document in which a magnetic tag in which a plurality of magnetostrictive elements are combined may be formed.

  As described above, examples of the detection signal of the resonance frequency detected when the magnetic tag of the amorphous magnetostrictive element shown in FIG. 3 receives an alternating magnetic field of a predetermined frequency and magnetostrictively vibrates are all on the original paper. An example in which the entire surface of an amorphous magnetostrictive element is formed by bonding is shown.

  However, even if the amorphous magnetostrictive element has the same composition (for example, Fe-B-Si), thickness, width, and length, the area of the fixing portion that fixes the amorphous magnetostrictive element on the sheet (hereinafter referred to as “bonding area”). ”), The resonance frequency due to the magnetostrictive vibration of the amorphous magnetostrictive element changes corresponding to the bonding area.

  Therefore, the original of the medium to which the magnetic tag according to the present invention is attached is given by changing the adhesive area for fixing the magnetostrictive element forming the magnetic tag on the original so that each original can be identified. It is configured.

  FIG. 4 is a table showing the detection result of the resonance frequency by the magnetostrictive vibration detected corresponding to the adhesion area of the magnetostrictive element fixed on the document.

  FIG. 4A is a diagram showing the bonding state of the amorphous magnetic element bonded and fixed on the paper, and FIG. 4B is fixed by bonding on the paper as shown in FIG. 4A. It is the table | surface which showed the measurement result of the resonant frequency corresponding to the adhesion area of the made magnetostriction element.

  As shown in FIG. 4A, for example, an amorphous magnetostrictive element 401 having a thickness T, a width W, and a length L is placed on an original magnetostrictive element 401 having a magnetic tag according to the present invention. From the predetermined one end A to the other end C opposite to the predetermined one end A, a W × B area S of length B (a hatched portion, hereinafter referred to as “bonding area S”) is applied to the sheet. FIG. 4B shows the measurement result of the resonance frequency corresponding to the bonding area S of each amorphous magnetostrictive element which is configured to be bonded and fixed, and the length L of the amorphous magnetostrictive element is 30 mm, 40 mm and 50 mm, respectively. ing.

  In Table 40 shown in FIG. 4B, the amorphous magnetostrictive element 401 shown in FIG. 4A has a thickness T of 25 μm, a width W of 7 mm, and a length L of 30 mm, 40 mm, and 50 mm, respectively. The length corresponding to the bonding area S of each amorphous magnetostrictive element is changed by changing the length Bmm from the predetermined one end A of each amorphous magnetostrictive element to the other end C facing the predetermined one end A with respect to the magnetostrictive element. The results obtained by measuring the resonant frequency of the amorphous magnetic element are shown.

  For example, the table 40 includes a “NO.” Column 411, a “amorphous magnetostrictive element length L (mm) column” 412, and a “magnetic element length B (mm) bonded to paper” column 413. In the “Length B (mm) of magnetic element bonded to paper” column 413, the length B of each amorphous magnetostrictive element having an amorphous magnetostrictive element length L of 30 mm, 40 mm, 50 mm,... , Resonance frequencies corresponding to the adhesion area S of each amorphous magnetostrictive element formed by 2 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm,.

  Each of the amorphous magnetostrictive elements having a length L of 30 mm, 40 mm, 50 mm, etc. shown in Table 40 has a thickness T of 25 μm and a width W of 7 mm, and the length of the magnetic element adhered and fixed to the paper. If B is determined, the bonding area S of the amorphous magnetostrictive element corresponding to B is uniquely determined as 7 mm × Bmm.

  According to Table 40, “2” in the “NO.” Column 411 includes an amorphous magnetostrictive element having a length L of 40 mm on the original paper 400 and a length B from a predetermined one end A of “2” mm, “10”. ”Mm,“ 20 ”mm,“ 30 ”mm, and“ 40 ”mm, the resonant frequencies of the amorphous magnetostrictive elements corresponding to the bonding areas S are“ 58 ”kHz,“ 53 ”kHz, and“ 50 ”kHz, respectively. , “45” kHz, and “41” kHz.

  Note that the case where the length B is bonded by “40” mm to the amorphous magnetostrictive element having the length L of 40 mm indicates that the entire surface of the amorphous magnetic element is bonded and fixed on the document sheet 400. .

  Further, “1” in the “NO.” Column 411 includes an amorphous magnetostrictive element having a length L of 30 mm on the original paper 400 and a length B from a predetermined end A of “2” mm, “10” mm, The resonance frequency of the amorphous magnetostrictive element corresponding to each bonding area S, which is bonded and fixed by “20” mm and “30” mm, is detected at “75” kHz, “65” kHz, “68” kHz, and “57” kHz, respectively. In “3” of the “NO.” Column 411, an amorphous magnetostrictive element having a length L of 50 mm on the original paper 400 is set to a length B from a predetermined end A of “2”. mm, “10” mm, “20” mm, “30” mm, “40” mm, and “50” mm, the resonance frequency of the amorphous magnetostrictive element corresponding to each adhesion area S bonded and fixed is “47” kHz, "38" kHz, "41" Hz, "42" kHz, that is detected by the "34" kHz are shown.

  As described above, the amorphous area corresponding to the adhesion area S is changed by changing the adhesion area S of the amorphous magnetostrictive element that is bonded and fixed on the paper to the amorphous magnetostrictive element having the same thickness T, width W, and length L. It becomes possible to detect the resonance frequency unique to the magnetostrictive element.

  Furthermore, by changing the bonding area S of the amorphous magnetostrictive element that is bonded and fixed on the sheet to a plurality of amorphous magnetostrictive elements having different lengths L, the unique length L corresponding to the length L and the bonding area S of the morphous magnetostrictive element is obtained. The resonance frequency can be detected.

  Therefore, a plurality of amorphous magnetostrictive elements having different lengths L are formed by changing the adhesive area S of the amorphous magnetostrictive element for adhering and fixing on the paper, and the inherent resonance corresponding to the length L and the adhesive area S of the amorphous magnetostrictive element. By measuring and storing the frequency in advance, the adhesive area S of the amorphous magnetostrictive element and the length L of the amorphous magnetostrictive element corresponding to the detected resonance frequency can be specified.

  That is, even if the amorphous magnetostrictive element has the same length, the resonance frequency varies depending on the adhesive area of the amorphous magnetostrictive element that is bonded and fixed on the paper, and the amorphous magnetostrictive element corresponds to the adhesive area to the amorphous magnetostrictive element having a different length. Therefore, it is possible to read the information of the magnetic tag added with more information expressed by creating and referring to data in which these are associated in advance.

  FIG. 5 is a view showing an example of a magnetic tag formed on each original constituting a set of a plurality of types of originals that are stored in an envelope 4 and are provided with a magnetic tag according to the present invention. FIG. 6 shows a resonance frequency pattern due to magnetostrictive vibration of each magnetic tag detected by applying an alternating magnetic field of a predetermined frequency to the original containing the original with the magnetic tag shown in FIG. FIG.

  As shown in FIG. 5, the first original 51 has a magnetic tag 1L511, the second original 52 has a magnetic tag 2L521, the third original 53 has a magnetic tag 3L531, the fourth original 54 has a magnetic tag 4L541, and a fifth original. 55, magnetic tags 5L551 are respectively formed. Each magnetic tag has a thickness T of 25 μm, a width W of 7 mm, as shown in Table 40 of FIG. 4B, “2” in the “NO.” Column 411, It is composed of an amorphous magnetostrictive element having a length L of 40 mm, and is formed so that the adhesive areas for adhering and fixing the amorphous magnetostrictive element of each magnetic tag on each original sheet are different.

  For example, the first original 51 is formed with a magnetic tag 1L511 in which an amorphous magnetostrictive element is bonded and fixed to a length B of 2 mm from a predetermined end A of the amorphous magnetostrictive element. Magnetic tags 2L521, 3L531 having a length B of 10 mm, 20 mm, 30 mm, and 40 mm (entire surface) from predetermined one end A of the amorphous magnetostrictive element formed on each of the four originals 54 and the fifth original 55, respectively. 4L541 and 5L551 are formed.

  The frequency from the outside of the envelope 4 is reduced to the envelope 4 containing the originals 51, 52, 53, 54, 55 to which the magnetic tags 1L511, 2L521, 3L531, 4L541, 5L551 are formed. When an alternating magnetic field that is linearly changed from high frequency to high frequency or from high frequency to low frequency is applied, the magnetic tag formed on each original resonates with the frequency of the alternating magnetic field and vibrates magnetostrictively.

  The magnetostrictive vibration resonating with an alternating magnetic field of a predetermined frequency of each magnetic tag causes each magnetic tag to vibrate with the largest amplitude distortion. Therefore, an electromagnetic wave having a predetermined intensity generated by the magnetostrictive vibration of each magnetic tag is detected. Then, a resonance frequency pattern 601 as shown in FIG. 6 is detected.

  In the resonance frequency pattern 601, the waveform signals G, H, I, J, and K indicating the respective resonance frequencies of the magnetic tags 1L511, 2L521, 3L531, 4L541, and 5L551 are detected. Indicates the resonance frequency of the element 1L511, the waveform signal H is the resonance frequency of the magnetostrictive element 2L521, the waveform signal I is the resonance frequency of the magnetostrictive element 3L531, the waveform signal J is the resonance frequency of the magnetostrictive element 4L541, and the waveform signal K is the magnetostriction. The resonance frequency of the element 5L551 is shown.

  Therefore, the first document 51, the second document 52, the third document 53, the fourth document 54, and the fifth document 55 on which the magnetic tags 1L511, 2L521, 3L531, 4L541, and 5L551 are respectively formed are overlapped in the envelope 4. A method of detecting and confirming a document stored in the envelope 4 from the outside of the envelope 4 in a non-contact manner without opening each document in the envelope 4 after being sealed in the container will be described.

  FIG. 7 shows a set of the first document 51, the second document 52, the third document 53, the fourth document 54, and the fifth document 55 shown in FIG. 6 is a diagram showing a resonance frequency pattern detected from the envelope 4 when some documents are forgotten to be put in the envelope 4 in the case of storing and shipping the envelope in the envelope 4.

  FIG. 7A is a diagram showing a resonance frequency pattern in a state where the third document 53 is forgotten to be put in the envelope 4, and FIG. 7B is a diagram showing the second document 52 and the fourth document 54 in the envelope 4. FIG. 7C is a diagram showing a resonance frequency pattern in a state in which the third document 53, the fourth document 54, and the fifth document 55 are forgotten to be put in the envelope 4. FIG.

  Based on these resonance frequency patterns, the type of the document stored in the envelope 4 can be confirmed, and it can be determined whether or not there is a document forgotten.

  For example, as shown in FIG. 7A, an alternating magnetic field in which the frequency is linearly changed from a low frequency to a high frequency or from a high frequency to a low frequency is applied to the envelope 4 in a state where the third original 53 is forgotten. The magnetic tags 1L511, 2L521, 4L541, and 5L551 formed on the first document 51, the second document 52, the fourth document 54, and the fifth document 55 stored in the envelope 4 have their own resonance frequencies. In response to the alternating magnetic field, magnetostrictive vibration is generated to generate an electromagnetic wave, and the detection device 1 detects the resonance frequency of the magnetostriction vibration unique to each magnetic tag and detects a resonance frequency pattern 701 as shown in FIG.

  Waveform signals G, H, J, and K are detected in the resonance frequency pattern 701, and compared with the resonance frequency pattern 601 shown in FIG. 6, the resonance frequency pattern 701 is formed on the third original 53. It can be seen that the waveform signal I which is the resonance frequency of the magnetic tag 3L531 is not detected.

  Further, as shown in FIG. 7B, the frequency is linearly changed from a low frequency to a high frequency or from a high frequency to a low frequency with respect to the envelope 4 in a state where the second original 52 and the fourth original 54 are forgotten to be inserted. When the alternating magnetic field is applied, the magnetic tags 1L511, 3L531, and 5L551 formed on the first document 51, the third document 53, and the fifth document 55 accommodated in the envelope 4 are switched with their respective resonance frequencies. In response to the magnetic field, the magnetostrictive vibration is generated to generate an electromagnetic wave, and the detection device 1 detects the resonant frequency of the magnetostrictive vibration unique to each magnetic tag to detect a resonant frequency pattern 702 as shown in FIG.

  Waveform signals G, I, and J are detected in the resonance frequency pattern 703. Compared with the resonance frequency pattern 601 shown in FIG. 6, the resonance frequency pattern 702 includes the second original 52 and the fourth original. It can be seen that the waveform signals H and K indicating the resonance frequencies of the magnetic tags 2L521 and 3L531 respectively formed on 54 are not detected.

  Further, as shown in FIG. 7C, the frequency is changed from a low frequency to a high frequency or from a high frequency to a low frequency with respect to the envelope 4 in which the third original 53, the fourth original 54, and the fifth original 55 are forgotten. When an alternating magnetic field that is linearly changed is applied, the magnetic tags 1L511, 2L521 formed on the first original 51 and the second original 52 stored in the envelope 4 generate alternating magnetic fields of their own resonance frequencies. In response, the magnetostrictive vibration is generated to generate an electromagnetic wave, and the detection device 1 detects the resonance frequency of the magnetostriction vibration unique to each magnetic tag to detect a resonance frequency pattern 703 as shown in FIG.

  Waveform signals G and H are detected in the resonance frequency pattern 703. Compared with the resonance frequency pattern 601 shown in FIG. 6, the resonance frequency pattern 703 includes the second original 52, the third original 53, It can be seen that the waveform signals I, J, and K indicating the resonance frequencies of the magnetic tags 2L521, 3L531, 4L541, and 5L551 formed on the fourth original 54 and the fifth original 55 are not detected.

  In this way, the detection device 1 transmits an alternating magnetic field in which the frequency is changed linearly from a low frequency to a high frequency or from a high frequency to a low frequency to the envelope 4, and the envelope 4 is transmitted by the transmitted alternating magnetic field of each frequency. By detecting the electromagnetic wave due to magnetostrictive vibration of the magnetic tag of each original stored in the document, and detecting the resonance frequency due to magnetostrictive vibration corresponding to the adhesive area where the amorphous magnetostrictive element of each magnetic tag is adhered and fixed on the original, the envelope The type of document stored in the document 4 can be detected and confirmed from the outside of the envelope 4 without opening the document 4 without contact.

  Note that the magnetic tags 1L511, 2L521, 3L531, 4L541, 5L551 formed on the originals of the first original 51, the second original 52, the third original 53, the fourth original 54, and the fifth original 55 constituting one set. It is assumed that the resonance frequency of each inherent magnetostrictive vibration is detected and stored and managed by the detection device 1 in advance.

  In the above description, the identification information enabling identification of each document is the W × B adhesive length B from the predetermined one end A of the amorphous magnetostrictive element to the other one end C facing the predetermined one end A. Although an example of a configuration in which the area S is adhesively fixed to the paper has been shown, an amorphous magnetostrictive element as shown in FIG. 8 has a predetermined length B (1), B (2) from both ends A and C of the amorphous magnetostrictive element, respectively. May be formed by bonding and fixing only the portions of the bonding areas S (1) and S (2) (see the hatched portion in FIG. 8A) formed on the document. Only the portion of the adhesive area S (3) formed by a predetermined length B (3) from any position other than one end A and C of the magnetostrictive element (see the hatched portion in FIG. 8B) is placed on the document. It may be configured to be bonded and fixed.

  Also, a plurality of amorphous magnetostrictive elements having different thicknesses, widths, and lengths of the amorphous magnetostrictive elements, and adhesive areas S (4) and S (5) for adhering the amorphous magnetostrictive elements to the original (shaded lines in FIG. 8C) (Refer to the portion) may be combined and fixed on the original.

  Now, a method for producing a medium with a magnetic tag according to the present invention will be briefly described.

  FIG. 9 is a block diagram showing a configuration of an example of an additional information adding device for creating a medium according to the present invention to which additional information is added, and FIG. 10 is a transport mechanism section of the additional information adding device 900. It is the figure which showed the structure of the part of 80 roughly.

9 and 10, the transport mechanism 80 shown in FIG. 9 is a plan view, and the view shown in FIG. 10 is a side view.
9 and 10, an additional information adding device 900 (a portion surrounded by a one-dot chain line) is attached to the paper carry-out side of the printer 2 as an image forming device, and image information is printed by the printer 2 and discharged. The document 12 is taken in, and identification information for identifying the document 12 is formed and attached to the document 12 by the magnetic tag 830 of the amorphous magnetostrictive element.

  The magnetic tag 830 of the amorphous magnetostrictive element formed and applied on the document 12 is an amorphous that is bonded and fixed on the document 12 when the amorphous magnetostrictive element is formed and applied on the document 12 corresponding to the identification information unique to the document 12. It is formed by changing the adhesion area of the magnetostrictive element.

  The additional information adding device 900 includes a transport mechanism 80 that transports the document 12 discharged from the printer 2, and a magnetic control corresponding to drive control of the transport mechanism 80 and identification information unique to the document 12 formed on the document 12. The control circuit unit 70 is configured to perform control and the like for forming the tag 11.

  The pair of paper feed rollers 85 of the transport mechanism unit 80 is provided at a position opposite to the paper carry-out port of the printer 2, takes the document 12 discharged from the printer 2 into the transport mechanism unit 80, and loads the captured document 12. A pair of paper carry-out rollers 86 carry out to the outside of the additional information adding device 900.

  As shown in FIG. 10, a magnetostrictive element transfer device 81 (a portion surrounded by an alternate long and short dash line in FIG. 9) is disposed between the rollers 85 and 86, and the heating resistor of the magnetostrictive element transfer device 81. A guide roller 871 is installed at a position facing 812.

  The original 12 discharged from the printer 2 passes through the pair of paper feed rollers 85, between the magnetostrictive element transfer device 81 and the guide roller 871, and the pair of paper carry-out rollers 86, and is carried out from the transport mechanism unit 80. Is done.

  The magnetostrictive element transfer device 81 of the transport mechanism 80 is sufficiently wound with a thermal transfer sheet 811 configured so that a desired area of the amorphous magnetostrictive element can be adhered when the amorphous magnetostrictive element is bonded and fixed onto the document 12. A sheet feed roller 813 and a sheet take-up roller 814 attached to the end of the thermal transfer sheet 811.

  The magnetostrictive element transfer device 81 is changed to a magnetostrictive element transfer device in which a thermal transfer sheet of a type corresponding to the thickness, width, and length of the amorphous magnetostrictive element and the bonding area for bonding the amorphous magnetostrictive element on the original 12 is accommodated. Thus, it is possible to bond and fix an amorphous magnetostrictive element of a desired size on a document with a desired bonding area.

  For example, when the magnetic tag 3L531 formed and added to the third original 53 as shown in FIG. 5 is formed on the original 12, the amorphous magnetostriction having a thickness T of 25 μm, a width W of 7 mm, and a length L of 40 mm. The same magnetic tag as the magnetic tag 3L531 is provided by disposing a magnetostrictive element transfer device containing a thermal transfer sheet in which the element is bonded to the original 12 by 20 mm in length B from one end A of the amorphous magnetostrictive element. Can be formed on the document 12.

  The original 12 discharged from the printer 2 passes through the pair of paper feed rollers 85, between the magnetostrictive element transfer device 81 and the guide roller 871, and the pair of paper carry-out rollers 86, and is carried out from the transport mechanism unit 80. Is done.

  The thermal transfer sheet 811 is sent out from the sheet feed roller 813 by the drive control of the magnetostrictive element transfer device 81 by the control circuit unit 70 and is taken up by the sheet take-up roller 814. The thermal transfer sheet 811 is configured to pass between the heating resistor 812 and the guide roller 871 together with the document 12 based on control by the control circuit unit 70.

  The magnetostrictive element transfer device 81 is slidably mounted inside the transport mechanism 80 in the axial direction of the guide roller 871, and the amorphous magnetostrictive element included in the thermal transfer sheet 811 is placed at a desired position on the document 12. It is configured to be capable of thermal transfer.

  The control circuit unit 70 of the additional information providing device 900 includes an information input unit 71, a transport control unit 72, and a magnetic tag forming unit 73.

  The information input unit 71 acquires image information printed by the printer 2 from the printer 2.

  The conveyance control unit 72 controls the driving of the conveyance mechanism unit 80 to convey the document 12 discharged from the printer 2.

  The magnetic tag forming unit 73 controls the operations of the sheet feeding roller 813 and the sheet winding roller 814 of the magnetostrictive element transfer device 81 in which the thermal transfer sheet 811 is accommodated in cooperation with the conveyance control unit 12.

  Then, while controlling the conveyance of the thermal transfer sheet 811, the heating resistor 812 of the magnetostrictive element transfer device 81 generates heat to melt a part of the thermal transfer sheet 811, and the thermal transfer is performed on the original 12 by a predetermined adhesive area of the amorphous magnetostrictive element. To fix.

  In this way, the bonding area of the amorphous magnetostrictive element corresponding to the identification information of the document 12 is thermally transferred onto the document 12 and bonded and fixed.

  FIG. 11 is a diagram showing a configuration of the thermal transfer sheet 811 accommodated in the magnetostrictive element transfer device 81.

  FIG. 11A is a perspective view showing the basic configuration of the thermal transfer sheet 811 accommodated in the magnetostrictive element transfer device 81, and FIGS. 11B and 11C are shown in FIG. FIG. 5 is an enlarged view showing a characteristic configuration of the thermal transfer sheet 811 when a perspective view of the thermal transfer sheet 811 is viewed from a predetermined direction.

  In FIG. 11, for convenience of explanation, the magnetic tag 3L531 formed and added to the third document 53 shown in FIG. 5 is shown as an example.

  As shown in FIG. 11, a thermal transfer sheet 811 includes a sheet substrate 8110, a heat melting layer 8111 made of a heat melting material, an amorphous magnetostrictive element having a thickness T of 25 μm, a width W of 7 mm, and a length L of 40 mm. 8113 and an adhesive layer 8112 made of an adhesive material.

  An adhesive is added to the adhesive layer 811 so that the length B from one end A of the amorphous magnetostrictive element 8113 can be adhered by 20 mm when the amorphous magnetostrictive element 8113 is bonded and fixed to the document 12 (FIG. 11 ( c)).

  The heat-melting layer 8111 and the adhesive layer 8112 are divided at predetermined intervals in a direction orthogonal to the feeding direction of the thermal transfer sheet 811 (arrow 820 in FIG. 11A).

  When the thermal transfer sheet 811 is thermally transferred to the document 12, it is performed by the heating resistor 812. Therefore, it is desirable to divide the thermal transfer sheet 811 in advance according to the width of the heating resistor 812.

  Each region of the divided thermal transfer sheet 811, for example, 811 a and 811 b includes an amorphous magnetostrictive element 8113.

  Further, an acetoate film can be used as the sheet substrate 8110, and an acrylic resin adhesive can be used as the adhesive.

  FIG. 12 is an explanatory diagram for explaining a basic process for thermally transferring the thermal transfer sheet 811 shown in FIG. 11 onto a document.

  12A is a perspective view showing a state in which the heating resistor 812 generates heat and thermally transfers the thermal transfer sheet 811 onto the document 12. FIGS. 12B and 12C are FIGS. FIG. 12D shows a state of the thermal transfer sheet 811 when the perspective view of the thermal transfer sheet 811 shown in a) is viewed from a predetermined direction, and FIG. 12D is a magnetic tag of the amorphous magnetostrictive element 8113 formed on the document 12. FIG.

  A basic process for thermally transferring the amorphous magnetic element of the thermal transfer sheet onto the document 12 will be briefly described with reference to FIG.

  When the document 12 on which the image information is printed is discharged from the printer 2 and is carried into the transport mechanism 80 of the additional information adding device 900, the document 12 is transferred to the heating resistor 812 of the magnetostrictive element transfer device 81 by the paper feed roller 85. It is conveyed directly below.

  The magnetic tag forming unit 73 corresponds to the image information printed on the document 12 so that the magnetic tag can be formed at a predetermined position on the document 12, for example, a position where no image information is printed. The element transfer device 81 is moved to cause the heating resistor 812 of the magnetostrictive element transfer device 81 to generate heat as necessary.

  Due to the heat generated by the heating resistor 812, the heat-melting layer 8111 located at the position of the heat-generating resistor 812 as shown in FIGS. 12A to 12C at the time of heat generation is melted, and corresponds to the melted heat-melting layer 8111. As shown in FIG. 12D, the adhesive layer 8112 at the position to be peeled off adheres onto the document 12 being conveyed in parallel.

  Note that when the heating resistor 812 generates heat, the conveyance speeds of the thermal transfer sheet 811 and the document 12 are controlled to the same speed.

  In this way, the amorphous magnetic element 813 included in the thermal transfer sheet 811 is thermally transferred onto the document 12 and the magnetic tag 3L531 is formed and applied on the document 12.

The whole block diagram of the document confirmation apparatus which detects the document using the medium to which the magnetic tag concerning this invention was given The block diagram of the detection apparatus 1 which detects the magnetic tag formed in the medium to which the magnetic tag concerning this invention was provided. The figure which shows an example of the detection signal of the magnetic tag detected by the detection apparatus 1 The figure which shows an example of the detection result of the resonance frequency of the magnetostriction vibration corresponding to the adhesion area of the magnetic tag adhere | attached and fixed on the original document The figure which shows an example of the magnetic tag formed in each of multiple types of originals accommodated in the envelope 4 The figure which shows an example of the resonant frequency pattern by the magnetostriction vibration detected from the envelope in which each document shown in FIG. 5 was accommodated The figure which shows an example of the resonant frequency pattern by the magnetostriction vibration detected from the envelope which combined and accommodated each document shown in FIG. The figure which shows an example of another magnetic tag with the magnetic tag shown in FIG. Block diagram of an example of an additional information adding device for creating a medium with a magnetic tag according to the present invention to which additional information is added Schematic showing the structure of the transport mechanism in the additional information adding device shown in FIG. The figure which shows the structure of the thermal transfer sheet accommodated in the magnetostrictive element transfer apparatus 81 of the conveyance mechanism part shown in FIG. Explanatory drawing of the processing operation in which the thermal transfer sheet is thermally transferred onto the document

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Detection apparatus 2 Computer 3 Conveyance mechanism apparatus 4 Envelope 12, 200, 301, 302, 303, 400 Document 30 Conveyance belt 31 Gate 32 Gate control apparatus 33 Envelope delivery box 34 Envelope collection box 35 Delivery direction of delivery belt 51 First One original 52 Second original 53 Third original 54 Fourth original 55 Fifth original 70 Control circuit section 71 Information input section 72 Conveyance control section 73 Magnetic tag forming section 80 Conveyance mechanism section 81 Magnetic element transfer device 85 Paper feed roller 86 Paper carry-out Roller 90 Printer 201, 401 Amorphous magnetic tag 211 Alternating magnetic field generation unit 212 Transmission coil 213 Reception coil 214 Signal detection unit 215 Frequency analysis unit 216 Timing control unit 311 Amorphous magnetic tag (1M)
312 Amorphous magnetic tag (2M)
313 Amorphous magnetic tag (3M)
511 Amorphous magnetic tag (1L)
521 Amorphous magnetic tag (2L)
531 Amorphous Magnetic Tag (3L)
541 Amorphous Magnetic Tag (4L)
551 Amorphous magnetic tag (5L)
811 Thermal transfer sheet 812 Heating resistor 813 Sheet feed roller 814 Sheet take-up roller 871 Guide roller 8110 Sheet substrate 8111 Thermal melt layer 8112 Adhesive layer and amorphous magnetic element 8113 Amorphous magnetic element

Claims (10)

In a medium identification method using a magnetic tag, wherein a magnetic tag comprising at least one magnetostrictive element is provided on a medium and tag information of the magnetic tag is read based on a resonance vibration frequency of the magnetostrictive element in a predetermined alternating magnetic field.
The magnetostrictive element forming the magnetic tag is at least partially fixed on the medium,
A medium identification method, comprising: changing a resonance vibration frequency of the magnetostrictive element in the predetermined alternating magnetic field by changing an area of a fixing portion for fixing the magnetostrictive element to the medium. The magnetostrictive element is
Consisting of multiple magnetostrictive elements,
The tag information is
The medium identification method according to claim 1, wherein reading is performed based on a frequency pattern of resonance vibration of the plurality of magnetostrictive elements. The plurality of magnetostrictive elements are:
The medium identification method according to claim 2, wherein the shape is the same and the area of the fixed portion of the magnetostrictive element is different. The plurality of magnetostrictive elements are:
The medium identification method according to claim 2, wherein at least one has a different shape. The tag information is
The medium identification method according to claim 1, wherein the medium identification method is read based on a part of a frequency pattern of resonance vibration of the plurality of magnetostrictive elements. In a medium provided with a magnetic tag comprising at least one magnetostrictive element, and provided with a magnetic tag identified by tag information of the magnetic tag read based on a resonance vibration frequency of the magnetostrictive element in a predetermined alternating magnetic field,
The magnetostrictive element forming the magnetic tag is at least partially fixed on the medium,
A medium provided with a magnetic tag, wherein a resonance vibration frequency of the magnetostrictive element in the predetermined alternating magnetic field is changed by changing an area of a fixing portion for fixing the magnetostrictive element to the medium. The magnetostrictive element is
Consisting of multiple magnetostrictive elements,
The tag information is
The medium provided with the magnetic tag according to claim 6, wherein the medium is read based on a frequency pattern of resonance vibration of the plurality of magnetostrictive elements. The plurality of magnetostrictive elements are:
The medium provided with the magnetic tag according to claim 7, wherein the medium has the same shape and the areas of the fixed portions of the magnetostrictive element are different from each other. The plurality of magnetostrictive elements are:
The medium provided with the magnetic tag according to claim 7, wherein at least one has a different shape. The tag information is
The medium provided with the magnetic tag according to claim 6, wherein the medium is read based on a part of a frequency pattern of resonance vibration of the plurality of magnetostrictive elements.

Images