JP2006257564A - Method for setting sheet body identifier, method for setting document identifier and sheet body control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately judge whether a document is an original or not even if its surface state is changed. <P>SOLUTION: Paper 16 useful for making a document is randomly mixed with a magnetic wire. A document information readout part 22 to be filled in the paper is two-dimensionally equipped with an antenna unit 32 integrated with an excitation coil 28 for generating an alternating field and a detection coil 30 for detecting a pulsed reply signal generated from the magnetic wire by application of an alternating field so as to make a detection means or a detection unit face detection positions preset on the paper. When a document ID is set, paper information by the detection positions and intensity of reply signal detected by the detection coil at each detection position is acquired and data obtained by two-dimensionally arranging the paper information on the basis of the detection positions are used. The document ID for accurately identifying a document is obtained by using the data and even if the surface of paper is printed with an image or stuck with a stain, whether the document is true or not is accurately determined. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to authentication of whether or not a document is an original, and more particularly, to a sheet identifier setting method, a document identifier setting method, and a sheet identifier management system that can specify a sheet pair.

  In recent years, with improvement in performance of copying machines and printers and improvement in processing performance of personal computers, it has become possible to copy images recorded on originals with high definition. As a result, it is possible to form a high-quality image that is indistinguishable between a manuscript and a copy.

  By the way, it becomes possible to copy images that make it difficult to discriminate between a manuscript and a copy, so that not only banknotes and securities but also various documents such as passports, various titles, and various lighting documents are copied. There is a growing possibility, and it is desired to establish a technique that can determine whether a document is an original document with high accuracy.

  From here, using the random pattern image created by the plant fiber when weaving the paper, the feature value of the original pattern image is extracted and stored, and the corresponding feature value to be compared and the stored original feature There has been proposed a paper identification method for comparing authenticity to determine whether a comparison target is an original or not (see, for example, Patent Document 1).

Also, a document confirmation method for detecting whether or not the thickness of the paper forming the original is detected and memorized, and comparing it with the surface condition of the comparison target to determine whether the comparison target is the original or not (See, for example, Patent Document 2).
JP 2004-102562 A JP 2004-148611 A

  However, the feature quantity based on the surface state or a random pattern image of plant fibers can specify the paper forming the original, but the image or If characters or the like are printed, or if dirt or the like adheres and it becomes impossible to optically read the feature quantity for specifying the original, it becomes difficult to determine authenticity. There is a problem.

  The present invention has been made in view of the above-described facts, and provides a sheet body identifier setting method, a document identifier setting method, and a sheet body capable of accurately determining whether or not a sheet body such as a recording sheet is an original. The purpose is to provide a management system.

  In order to achieve the above object, the present invention uses, as a sheet body to which an identifier is assigned, a sheet body randomly embedded with a magnetic wire that emits a pulse-like response signal when an alternating magnetic field is applied. Data obtained by detecting the intensity of the response signal at each of a plurality of preset detection positions on the surface and arranging the detection results one-dimensionally or two-dimensionally based on the detection positions. Is set to an identifier that identifies the target sheet body.

  According to the present invention, using the Barkhausen effect, the intensity of the response signal of the magnetic wire randomly embedded in the sheet body is detected at a plurality of preset positions on the sheet body.

  The intensity of the pulse-like response signal generated by the magnetic wire embedded in the sheet body changes depending on the distance between the detection position and the magnetic wire. Further, by randomly embedding the magnetic wire, if the sheet body is different, the intensity of the response signal changes even at the same position.

  Accordingly, in the present invention, an array of response signal intensities at a plurality of preset detection positions on the sheet body is set as the identifier of the sheet body. As a result, even if the surface state changes due to the surface of the sheet member becoming dirty, accurate authenticity determination can be performed.

  As such a sheet body of the present invention, a sheet formed of an arbitrary material such as a resin plate as well as a recording sheet can be applied.

  The document identifier setting method of the present invention is a document identifier setting method that enables specification of a document created by forming an image or a character on a recording sheet, and the recording sheet is pulsed by applying an alternating magnetic field. A magnetic wire material that randomly generates a response signal is generated, and the intensity of the response signal is detected at each of a plurality of preset detection positions on the recording paper, and the detection result is detected as the detection position. And the data obtained by the arrangement is set as the document identifier of a document created using the recording sheet.

  According to the present invention, when a paper material such as a recording paper is applied as the sheet body and the identifier is set for a document using the recording paper in which the magnetic wire material is randomly inserted, the identifier of the recording paper is used.

  As a result, even if new writing is made on the document or dirt is attached, accurate authenticity authentication can be performed.

  In the present invention as described above, the detection position of the response signal can be an intersection of virtual grids on the recording paper. In other words, detection positions are set at predetermined intervals in the vertical and horizontal directions, and identifiers are set using the strength of the response signal at each detection position. This allows for proper authentication as well as setting of identifiers. It becomes.

  Such a sheet body management system to which the present invention is applied makes it possible to identify the sheet body with respect to a sheet body in which a magnetic wire that emits a pulse-like response signal is randomly embedded when an alternating magnetic field is applied. A management system that assigns and manages an identifier, wherein the alternating magnetic field is generated by the transmitting means, and the alternating magnetic field generated by the transmitting means at a plurality of preset detection positions of the sheet-like body It only needs to include detection means for detecting the intensity of the response signal and setting means for setting the identifier of the sheet body from the data array based on the detection result of the detection means at each detection position.

  Further, the sheet body management system of the present invention can include a coil unit in which the excitation coil that constitutes the transmission means and the detection coil that constitutes the detection means are integrated, and the detection means or the detection unit is provided respectively. May be two-dimensionally arranged so as to face the detection position of the sheet member.

  Further, in the present invention, it is preferable that the setting unit sets the identifier using a discrete value of the detection intensity, and the setting unit sets the identifier using bit data based on the discrete value. It is more preferable to set.

  By performing processing on the detected data in this way, a constant data array can be obtained regardless of the measurement conditions, and thus an identifier that can be accurately authenticated is obtained.

  Further, the present invention preferably includes storage means for storing sheet body information including the identifier for each of the set sheet bodies, and further includes a detection result of the detection means for a new sheet body, and the storage What is necessary is just to include the collation means which collates the said identifier memorize | stored in the means.

  As described above, according to the present invention, the intensity of a response signal with respect to an alternating magnetic field is detected at a plurality of preset detection positions on a pair of sheets randomly embedded with magnetic wires, and the detection position and the detected response signal are detected. Since the identifier is set based on the strength of the sheet, even if the surface state of the sheet body changes, an excellent effect that an accurate authenticity determination is possible can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a document management system 10 applied to the present embodiment.

  The document management system 10 is formed by a large number of copying apparatuses 14 together with the document registration apparatus 12. In the document management system 10, the document registration apparatus 12 and the copying apparatus 14 are connected to each other via a network, etc. Data exchange is possible.

  The connection between the document registration apparatus 12 and the copying apparatus 14 is not limited to this, and it is sufficient that at least data transmission from the document registration apparatus 12 to each copying apparatus 14 is possible, and preferably data transmission between each other is possible. Any configuration that can achieve this is applicable.

  The document registration device 12 registers a document 18 formed by printing an image or text on a paper 16 of a predetermined size as an original. At this time, the document registration apparatus 12 sets a document identifier (hereinafter referred to as a document ID) for each document 18 to be registered, so that the copy restriction management by the copying apparatus 14 can be performed using this document ID. Yes.

  FIG. 2 shows a schematic configuration of a recording sheet (hereinafter, referred to as a sheet 16) applied as a sheet member to the present embodiment. In the present embodiment, recording paper is used as the sheet body. However, the present invention is not limited to this, and a member made of any material that is not magnetized, such as a resin plate, an aluminum foil, or an aluminum plate, is used. It can apply to the sheet | seat body formed in the shape.

  As the paper 16, for example, a PPC (Plain Paper Copier) paper, which is generated by being rolled at a predetermined thickness by a general method, can be applied.

  In addition, a small-diameter and random length wire rod (hereinafter referred to as a magnetic wire rod 20) formed of a magnetic material is randomly inserted into the paper 16. The magnetic material 20 preferably has a wire diameter of 30 μm or more (radius of 15 μm or more). For example, when the thickness of the paper 16 is about 80 μm, the magnetic wire 20 is made to be about 40 μm. It is preferable that a convex portion is not generated on the surface of 16, the magnetic wire 20 becomes inconspicuous, and it is difficult to visually determine that the magnetic wire 20 is encased in the paper 16.

  Further, the length of the magnetic wire 20 can be any length of 5 mm or more, preferably about 15 mm in order to be detectable using the Barkhausen effect. In addition, if it is 5 mm or less, it may be regarded as the magnetic wire 20.

  Furthermore, the magnetic wire 20 can be formed using any magnetic material having low coercive force, such as amorphous silicon made of Co-Fe-Ni-B-Si.

  In the paper 16, since a large number of magnetic wires 20 having an arbitrary length of a predetermined length (for example, about 15 mm) are randomly inserted, the probability that the same arrangement of the magnetic wires 20 exists is extremely low. It has become. That is, it can be considered that substantially the same length, arrangement position, and arrangement of the magnetic wires do not occur.

  As shown in FIG. 1, the document registration apparatus 12 includes a document information reading unit 22 and an information processing unit 24 that performs predetermined processing on the document information (paper information) read by the document information reading unit 22. Has been.

  As the information processing unit 24, an information processing apparatus having an arbitrary configuration can be applied as long as various processes based on a program stored in advance, such as a personal computer or a workstation, are possible.

  In addition, the document information reading unit 22 may include a scanner function for reading an image formed on the document 18, and further, a multifunction machine having a printing function for forming a predetermined image, character, or the like on the paper 16. A device to which a document information reading function is added can be applied.

  The document information reading unit 22 obtains information (hereinafter referred to as paper information) based on the arrangement of the magnetic wire rods 20 inserted into the paper 16 of the document 18 using the Barkhausen effect.

  That is, the magnetic wire 20 has a relatively small holding force, and therefore the hysteresis loop has a substantially rectangular shape (not shown), so that steep magnetization reversal occurs. In the document information reading unit 22, an alternating magnetic field as shown in FIG. 3A is applied to the paper 16 in which the magnetic wire 20 is wound. The magnetic wire 20 generates a pulse-like response signal (magnetic noise) when magnetization reversal occurs at the magnetization reversal point HP as shown in FIG.

  The document information reading unit 22 detects a response signal generated by the magnetic wire 20 at a preset two-dimensional position of the paper 16 (for example, detected as a voltage change), and outputs the intensity array as paper information.

  FIG. 4 shows a schematic configuration of such a document information reading unit 22. In the document information reading unit 22, a power source (for example, AC power source) 26 used for generating an alternating magnetic field is provided. The document information reading unit 22 includes an excitation coil 28 that serves as an antenna that generates an alternating magnetic field by power supplied from a power supply 26 and a detection coil 30 that serves as a detection antenna that detects a radiation signal generated by the magnetic wire 20. A plurality of antenna units 32 are provided.

  The document information reading unit 22 generates alternating magnetic fields in each of the excitation coils 28 by supplying AC power from the power source 26 to each excitation coil 28. In addition, a current corresponding to the alternating magnetic field generated by the corresponding exciting coil 28 is induced in the detection coil 30. At this time, the exciting coil 28 faces the magnetic wire 20 of the paper 16 and the magnetic wire 20 generates a pulse-like response signal by the alternating magnetic field, so that a current corresponding to the response signal is induced. ing.

  The document information reading unit 22 is provided with a high-pass filter (HPF) 34, an integrator 36, and an A / D converter 38 corresponding to each of the detection coils 30. Here, the HPF 34, the integrator 36, and the A / D converter 38 are not shown separately, but are shown collectively.

  The current induced in each of the detection coils 30 is input to the HPF 34, and each of the HPFs 32 removes a low frequency component from the input current. The frequency of the power source 26 is lower than the frequency of the response signal generated by the magnetic wire material 20, and the HPF 34 removes the frequency component of the power source 26 and allows only the response signal component to pass.

  Each of the integrators 36 integrates the current that has passed through the HPF 34, and the A / D converter 38 A / D converts the integrated electric signal. Thereby, since the response signal generated from the magnetic wire 20 is included in the current detected by the detection coil 30, a voltage corresponding to the intensity of the response signal is output as digital data.

  On the other hand, the document information reading unit 22 includes a platen glass 40 and a document cover 42 that covers the upper surface side of the platen glass 40 as shown in FIG. 5, for example. The paper 16 or the document 18 using the paper 16 (hereinafter collectively referred to as the paper 16) is arranged at a predetermined position, and is covered with a document cover 42.

  As shown in FIG. 6, the document cover 42 is provided with an antenna unit 32 on the surface on the platen glass 40 side.

  The antenna units 32 are arranged at predetermined intervals in a region facing the paper 16. Thereby, when the paper 16 is arranged in the document information reading unit 22, the antenna unit 32 faces the surface of the paper 16 at a constant interval. Such an antenna unit 32 can be formed with a size of about 20 mm, for example, and from here, the antenna units 32 can be arranged with an interval of about 30 mm, for example.

  The paper 16 is arranged on the platen glass 40 in accordance with a preset reference position, so that the fixed position faces the antenna unit 32.

Accordingly, for example, if the upper right side of FIG. 6 is the origin O (0, 0), the coordinates of the central point Pxy of each antenna unit 32 are P ₁₁ (x ₁ , y ₁ ) to P _1m (x ₁ ). , Y _m ),..., P _n1 (x _n , y ₁ ) to P _nm (x _n , y _m ), and these points P _{11 to} P _nm are the coordinate positions on the paper 16. .

On the other hand, in each antenna unit 32, the number of magnetic wires 20 facing or close to each other (not shown in FIG. 6, see FIG. 2), the position, inclination, and magnetic wire 20 with respect to the point P _xy for each magnetic wire 20. The level (intensity) of the response signal to be detected differs depending on the length of.

  Further, the level of the response signal detected by each antenna unit 32 is different for each sheet 16, and if the same sheet 16, the level of the response signal detected by each antenna unit 32 is the same.

The document information reading unit 22 outputs a voltage corresponding to the intensity of the response signal detected by the detection coil 30 of each antenna unit 32. That is, paper information based on the magnetic wire 20 on the paper 16 at a position corresponding to the point P _nm is obtained.

  Here, in the information processing unit 24, when all the data obtained from the output (paper information) from the document information reading unit 22 is “0”, the corresponding paper 16 or document 18 is the paper 16 or document 18 to be registered. Judge that it is not.

On the other hand, when any voltage V _{xy at} the point P _xy is at a large level by the magnetic wire 20 (for example, a value set in advance so that it can be determined that the magnetic wire 20 exists) In the above, the corresponding paper 16 or document 18 is registered.

The information processing unit 24 uses the voltage V _xy for each point P _xy (where x is 1 to n and y is 1 to m) input from the document information reading unit 22 as two-dimensional array data for each sheet 16 ( A document ID for specifying the document 18 (paper 16 forming the document 18) is generated.

The array of data obtained for each point P _xy is
V ₁₁ , V ₁₂ , _... , V _1m
V ₂₁ , V ₂₂ , _... , V _2m
・ ・ ・ ・ ・ ・ ・ ・
V _n1 , V _n2 , _... , V _nm
It becomes. The document management system 10 sets this data array as the document ID.

Note that data obtained by setting the maximum value of the voltage V _xy to 1 may be normalized and held as a real value from 0 to 1. Thereby, for example, the data shown in FIG. 7A can be used as the document ID.

  In addition, a threshold value may be set, so that a discrete value may be set to “1” when the threshold value is exceeded, and “0” when the threshold value is not reached. Is 0.8, the document ID shown in FIG. 7A can be used to form the bit data shown in FIG. 7B.

  By performing data processing in this way, data having a constant value can be obtained regardless of detection conditions. That is, the values obtained by the measurement conditions such as the voltage of the power supply 26 and the period of the alternating magnetic field (power supply frequency) when reading by the document information reading unit 22 are different, but by using discrete values, regardless of the measurement conditions. A substantially constant value can be obtained, and by using bit data, the amount of data can be reduced, and collation processing using a set document ID can be facilitated.

  Here, the two-dimensional array of response signals is used as the document ID, but it may be converted into one dimension and the one-dimensional data may be used as the document ID.

  On the other hand, as shown in FIG. 1, the information processing unit 24 is provided with a management data storage unit 46. When the information processing unit 24 determines that the paper 16 or the document 18 should be registered, The set document ID is stored in the management data storage unit 46 together with the information on the document 18, and the document 18 is registered.

  On the other hand, the copying apparatus 14 provided in the document management system 10 includes a scanner unit 48 and a print unit 50. The scanner unit 48 reads an image recorded on a document to generate image data. By outputting the image data to the printing unit 50, an image corresponding to the image data can be formed on the paper 16 and output.

  Such a copying apparatus 14 may have a printer function. In this case, the copying apparatus 14 prints out an image corresponding to image data input from an image processing apparatus such as a personal computer. Also good.

  The scanner unit 48 of the copying apparatus 14 is provided with a document information reading unit 52 and a copy control unit 54.

  The document reading unit 52 can apply the same configuration as the document information reading unit 22 described above (see FIGS. 4 and 5). That is, the antenna unit 32 is arranged at a predetermined interval on the document cover 42 provided in the scanner unit 48, and the paper 16 is loaded in accordance with the reference position, whereby the Barkhausen effect at the point Pxy on the paper 16 is obtained. It is possible to detect a response signal using and to output paper information based on the detected response signal.

  The document information reading unit 52 outputs the read paper information to the copy control unit 54. In the copy control unit 54, when the paper information input from the document information reading unit 52 includes a voltage higher than a preset level, the paper 16 or the document 18 is registered in the document management system 10. It is determined that there is a possibility, and the document ID is collated.

  The copy control unit 54 is connected to the management data storage unit 46 of the information processing unit 24. When collating the document ID, the copy control unit 54 reads the document ID of the document 18 stored in the management data storage unit 46, The documents read by the document information reading unit 52 are compared. At this time, when the document ID is bit data, the paper information input from the document information reading unit 52 is converted into bit data based on a predetermined threshold, and the paper information is converted into data corresponding to the document ID. Anything to do.

  Here, in the document control unit 54, if the registered document ID matches the document ID input from the document information reading unit 52, the paper 16 loaded in the document information reading unit 52 is registered as the registered paper. 16 (document 18), and copying of images formed on the paper 16 is restricted.

  In the document management system 10 configured as described above, for example, when creating a document 18 that restricts or prohibits copying of various types of certificates, the paper 16 in which the magnetic wire 20 is randomly placed is used. 16 forms a predetermined image. Also, the document 18 created using the paper 16 is registered as a copy restriction target.

  At this time, the document 18 to be registered or the paper 16 used to create the document 18 (hereinafter referred to as paper 16) is loaded into the document information reading unit 22 and the paper information is read from the paper 16.

  Thereafter, it is confirmed whether or not the sheet can be registered from the read sheet information, that is, whether or not the magnetic wire 20 is embedded in the loaded paper 16, and the magnetic wire 20 embedded in the paper 16 is checked. Can be detected and the document 18 using the paper 16 is registered.

  The registration of the document 18 using the paper 16 is based on the read paper information, that is, the paper information based on the magnetic wire 20 randomly drawn in the paper 16 and the document 18 created using the paper 16. Set the ID.

  Thereafter, the document registration is performed by storing the information related to the document 18 together with the set document ID in the management data storage unit 46.

  Such document registration may be performed before the image is formed on the paper 16, or may be performed after the image is formed on the paper 16. That is, since the document management system 10 sets the document ID based on the arrangement of the magnetic material 20 embedded in the paper 16, even if an image or a character is recorded on the paper 16, the paper information is accurately obtained. It can be read.

  On the other hand, the copying apparatus 14 provided in the document management system 10 can check whether or not the document 18 is registered for an arbitrary document. To check whether the document is a registered document, the target document is loaded into the document information reading unit 52, and the paper information of the paper on which the document is formed is read.

  Here, when the paper of the target document is a sheet in which the magnetic wire 20 is not inserted, any of the antenna units 32 does not detect a response signal to the alternating magnetic field.

  On the other hand, when the magnetic wire 20 is the paper 16 in which the magnetic wire 20 is inserted, the paper information corresponding to the arrangement of the magnetic wire 20 is output from the document information reading unit 52, so that the document information reading unit 52 outputs it. Based on the paper information, it is possible to determine whether or not the magnetic wire 20 is inserted into the paper.

  In the copying apparatus 14, when the magnetic wire 20 is the paper 16 in which the magnetic wire 20 is inserted, the paper information read from the target document is compared with the document ID stored in the management data storage unit 46 of the document registration apparatus 12. To do. This comparison may be performed by transmitting the paper information from the copying apparatus 14 by the document registration apparatus 12 and by the information processing unit 24 of the document registration apparatus 12, and the copying apparatus 14 manages the document registration apparatus 12. The document ID may be read out from the data storage unit 46.

  For example, if the document ID is bit data, the paper information and the document ID can be compared and confirmed by converting the paper information of the target document into bit data.

  Here, the magnetic wire 20 is randomly encased in the paper 16, and for this reason, the paper information is substantially different for each paper 16.

  From this, when the paper information matches the document ID, it can be determined that the handling document is the document 18 registered.

  When such a determination is made, for example, the copying process for the document 18 in the copying apparatus 14 is prohibited, or the user who performs the copying operation is authenticated, and the copying process is executed based on the result. Can be performed.

  As a result, it is possible to reliably prevent copying using the registered document 18 as an original.

  In addition, since it is possible to accurately identify whether or not the document 18 is registered, it is possible to accurately determine the origin of the document, and a confidential document or the like leaks outside without intention. Can be suppressed.

  If no document registration is performed, a document ID that matches the sheet information does not exist even though the magnetic wire 20 is encased in the sheet 16. In such a case, the document registration apparatus 12 acquires the paper information of the corresponding document, and creates a document ID from the output paper information, whereby the copy history of the corresponding document as a document can be grasped.

  Further, the document management system 10 uses the paper 16 in which the magnetic wire 20 is inserted, and confirms whether or not the document 18 is registered based on the arrangement of the magnetic wire 20 in the paper 16. Therefore, for example, even if dirt is attached or writing is performed after the document 18 is registered, it is possible to accurately determine whether or not the document 18 is registered.

  In addition, this Embodiment demonstrated above does not limit the structure of this invention. For example, in this embodiment, the paper information is read using the antenna unit 32 arranged two-dimensionally at a predetermined interval. However, the present invention is not limited to this, and the paper 16 is two-dimensionally read. Any configuration can be applied as long as the response signal emitted from the magnetic wire 20 can be detected at each of the set positions.

  For example, in the present embodiment, the antenna unit 32 in which the excitation coil 28 and the detection coil 30 are integrated is used. However, the present invention is not limited to this, and only a large number of the detection units 30 are two-dimensionally arranged. One or a plurality of exciting coils may be provided on the lower surface side. At this time, an alternating magnetic field may be applied to the entire area of the paper 16 without moving the excitation coil, and the excitation coil can be scanned and moved so as to correspond to each of the plurality of detection coils. Anyway.

  In addition, the antenna unit 32 is arranged one-dimensionally at predetermined intervals along the vertical or horizontal direction of the paper 16, and a response signal generated by the magnetic wire 20 is detected while scanning and moving in a direction orthogonal to the arrangement direction. It may be.

  Further, various configurations such as using one antenna unit 32 and detecting the response signal emitted from the magnetic wire 20 while scanning and moving the antenna unit 32 in the longitudinal direction and the lateral direction of the paper 16, respectively. Can be applied.

  Further, in the present embodiment, the response signal emitted from the magnetic wire 20 is detected for each position at a predetermined interval along the vertical and horizontal directions of the paper 16, but the position where the response signal is detected is Any position and number can be applied as long as the positions are set in advance.

  That is, by increasing the number of points at which the response signal generated by the magnetic wire 20 is detected, the paper 16 can be accurately discriminated. As long as the position is set, the document ID may be created using the detection result of the response signal at an arbitrary position.

  In the present embodiment, the document management system 10 has been described as an example. However, the present invention is not limited to this. The response signal generated by the magnetic wire 20 from the paper 16 is read, and the document ID is based on the read response signal. Any configuration can be applied as long as it is possible to authenticate and authenticate the paper 16 using the registered document ID and registration.

It is a schematic proofreading chart of the document management system applied to this embodiment. It is the schematic which shows an example of arrangement | positioning of the magnetic wire to a paper. (A) is a diagram which shows the outline of an alternating magnetic field, (B) is a diagram which shows the outline of the response signal corresponding to the alternating magnetic field of (A). It is a schematic block diagram which shows an example of a document information reading part. It is a schematic block diagram which shows an example of the principal part of a document information reading part. It is the schematic of the document cover which provided the antenna unit. (A) and (B) are character strings showing examples of document IDs.

Explanation of symbols

10 Document management system (sheet body management system)
12 Document registration device 14 Copying device 16 Paper (recording paper, sheet)
18 Document 20 Magnetic wire 22 Document information reading unit (transmitting means, detecting means)
24 Information processing section (setting means, verification means)
26 Power supply (transmission means)
28 Excitation coil (transmitting means)
30 detection coil (detection means)
32 Antenna unit (detection unit)
46 Management data storage (recording means)
52 Document information reader (sending means, detecting means)
54 Copy control unit (verification means)

Claims (10)

As a sheet body to which an identifier is assigned,
Using a sheet body randomly embedded with a magnetic wire that emits a pulse-like response signal when an alternating magnetic field is applied,
At each of a plurality of preset detection positions on the surface of the sheet body, the intensity of the response signal is detected,
The detection result is arranged one-dimensionally or two-dimensionally based on the detection position, and data obtained by the arrangement is set as an identifier for specifying the target sheet body. Setting method. A document identifier setting method that enables identification of a document created by forming an image or text on a recording sheet,
The recording paper is generated by randomly inserting a magnetic wire that generates a pulse-like response signal when an alternating magnetic field is applied,
Detecting the strength of the response signal at each of a plurality of preset detection positions on the recording paper;
The detection results are arranged one-dimensionally or two-dimensionally based on the detection positions, and data obtained by the arrangement is set as a document identifier of a document created using the recording paper. How to set the document identifier.   The document identifier setting method according to claim 2, wherein the detection position of the response signal is an intersection of virtual grids on the recording paper. A management system that assigns and manages an identifier that can specify the sheet body, with respect to the sheet body randomly embedded with a magnetic wire that emits a pulse-like response signal by being given an alternating magnetic field,
Transmitting means for generating the alternating magnetic field; and
Detecting means for detecting the strength of the response signal to the alternating magnetic field emitted by the transmitting means at a plurality of preset detection positions of the sheet body;
Setting means for setting the identifier of the sheet body from the data array based on the detection result of the detection means at each detection position;
A sheet body management system comprising:   5. The sheet body management system according to claim 4, further comprising a detection unit in which an excitation coil forming the transmission unit and a detection coil forming the detection unit are integrated.   6. The sheet body management system according to claim 4, wherein the detection means or the detection units are two-dimensionally arranged so as to be opposed to the detection positions of the sheet body.   The sheet body management system according to any one of claims 4 to 6, wherein the setting means sets the identifier using a discrete value of the detection intensity.   The sheet body management system according to claim 7, wherein the setting unit sets the identifier using bit data based on the discrete value.   The sheet body management system according to any one of claims 4 to 8, further comprising storage means for storing sheet body information including the identifier for each of the set sheet bodies.   The sheet body management system according to claim 9, further comprising: a collating unit that collates a detection result of the detecting unit with respect to a new sheet body and the identifier stored in the storage unit.

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