JP2006195891A - Information detection device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information detection device which is improved in information detection accuracy by arranging an excitation coil so that the direction of magnetic flux of the excitation coil and the longitudinal direction of a magnetic material may become nearly parallel and applying the magnetic material to a substrate in detecting substrate's information corresponding to the magnetic material by detecting the change of a magnetic field by applying the magnetic material to the substrate and giving the magnetic field to the substrate from the excitation coil, and to provide a method thereof. <P>SOLUTION: In the information detection device which detects the change of the magnetic field by applying the magnetic material to the substrate and giving the magnetic field to the substrate from the excitation coil and detects the substrate's information corresponding to the magnetic material, the excitation coil is arranged so that the direction of the magnetic flux of the excitation coil and the longitudinal direction of the magnetic material may become nearly parallel and the magnetic material is applied to the substrate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In this invention, a magnetic material is applied to a base material, and a magnetic field from the exciting coil is applied to the base material to detect a magnetic field change caused by the magnetic material, thereby detecting information on the base material corresponding to the magnetic material. In particular, the information detection apparatus and method for detecting information accuracy by arranging the excitation coil so that the magnetic flux direction of the excitation coil and the longitudinal direction of the magnetic material are substantially parallel and applying the magnetic material to the base material. The present invention relates to an information detection apparatus and method with improved performance.

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

  For the purpose of preventing forgery of securities, etc., forgery of securities, etc. is prevented by creating securities, etc. using special paper with a specific pattern or special ink containing an infrared absorber. A method has been proposed.

  In this method, when securities, etc. created on special paper are copied by a scanner (image reading device) or a copying machine, a specific pattern, special ink, etc. latent on the special paper are visible. It is configured so that forgery can be prevented by being printed and identified as a copy.

  Further, for example, Patent Document 1 proposes forgery prevention paper that makes it extremely difficult to forge with a color copier or the like and forgery of securities paper itself and securities using the same, and Patent Document 2 discloses. There has been proposed an image processing apparatus and method that can always add a specific pattern even when a specific manuscript is copied.

  The proposal by the said patent document 1 is a paper base or a fiber piece by which the ink containing a metameric colorant was apply | coated to the paper base material which consists of a pulp fiber, the ink containing this metameric colorant, sunlight, etc. Two types of hues that differ in color from securities that have been color-copied by using anti-counterfeit paper in which almost the same amount of paper pieces or fiber pieces colored with normal color ink that looks the same color under light This is configured to prevent spotting and prevent counterfeiting.

In addition, the proposal by the above-mentioned patent document 2 always processes and outputs an output image of a specific original by determining the specificity of the original by combining the image from the original and the image from the transfer material, When a specific original (for example, banknote) that should not be copied is copied, it can be used as a clue to limit the location of the copied device.
JP 2001-159094 A Japanese Patent Laid-Open No. 05-219351

  However, the proposals shown in Patent Document 1 and Patent Document 2 all require an operation such as scanning image information such as a manuscript, a transfer material, and securities, and the securities and the like without performing these operations. Therefore, it is desirable to propose a method and apparatus for determining whether unauthorized copying of a document is impossible or whether the document is a specific manuscript, anti-counterfeit paper, and the like.

  Therefore, the present invention provides a base material corresponding to the magnetic material by applying a magnetic material to the base material, and detecting a magnetic field change due to the magnetic material by applying a magnetic field from the exciting coil to the base material. The detection accuracy of information has been improved by arranging the excitation coil so that the magnetic flux direction of the excitation coil and the longitudinal direction of the magnetic material are substantially parallel to each other and adding the magnetic material to the base material. An object of the present invention is to provide an information detection apparatus and method.

  In order to achieve the above object, the invention of claim 1 provides a magnetic material to a base material, detects a magnetic field change due to the magnetic material by applying a magnetic field from an exciting coil to the base material, and detects the magnetic field. In the information detection apparatus for detecting information on a base material corresponding to a magnetic material, the excitation coil is arranged so that a magnetic flux direction of the excitation coil and a longitudinal direction of the magnetic material are substantially parallel to each other, and the base material A magnetic material is added.

  According to a second aspect of the present invention, in the first aspect of the invention, the substrate is a printing paper on which a desired image is printed by a printer or a copying paper on which a desired image is copied by a copying machine. And

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the magnetic material is a magnetic material wire.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the detection coil detects a magnetic field change at the time of magnetization reversal of the magnetic material.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the detection coil detects a magnetic field change due to magnetostrictive vibration of the magnetic material.

  Further, the invention of claim 6 corresponds to the magnetic material by applying a magnetic material to the base material and detecting a magnetic field change by the magnetic material by applying a magnetic field from the exciting coil to the base material by the detection coil. In an information detection method for detecting information on a base material, the excitation coil is arranged so that a magnetic flux direction of the excitation coil and a longitudinal direction of the magnetic material are substantially parallel, and the magnetic material is applied to the base material. It is characterized by that.

  According to the information detection apparatus and method of the present invention, a magnetic material is applied to a base material, and a magnetic field from the exciting coil is applied to the base material to detect a magnetic field change caused by the magnetic material, thereby supporting the magnetic material. In the information detection device that detects the information on the base material, the magnetic coil is disposed on the base material so that the magnetic flux direction of the excitation coil and the longitudinal direction of the magnetic material are substantially parallel, and the magnetic material is applied to the base material. While the apparatus detects the magnetic material applied to the base material, false detection due to the direction of the base material is reduced, and the detection accuracy of information on the base material corresponding to the magnetic material is improved.

  In addition, even if a minimum number of magnetic materials are applied to the base material, the magnetic material applied to the base material is detected with high accuracy, so that the production cost of the base material provided with the magnetic material can be reduced, This makes it difficult to confirm the presence of the magnetic material applied to the base material, enhances the security effect, and prevents the image information printed on the base material from being deteriorated due to the presence of the magnetic material.

  Hereinafter, an example in which the information detection apparatus and method according to the present invention are applied to a copying machine will be described in detail with reference to the accompanying drawings.

  The information detection apparatus and method according to the present invention are applied to, for example, a printing apparatus, a copying machine, an antitheft apparatus, etc. for the purpose of preventing information leakage of confidential information and personal information, or document management, etc., and printing confidential information, etc. In the case of output, the document management is performed by printing out on a base material (for example, printing paper) to which a magnetic material has been applied in advance, or paper on which confidential information or the like is printed (for example, a document or printed matter to which a magnetic material has been applied) When the information is to be copied, the information detection device according to the present invention provided on the copying machine detects the magnetic material applied to the sheet, and controls the copying process of the copying machine to be prohibited or confidential. When a sheet on which information or the like is printed is illegally taken out, the information detection device according to the present invention provided in the anti-theft device detects and issues an illegal take-out prevention process. In to prevent the confidential information or the like is taken out unauthorized copy or unauthorized, and possible leakage preventing confidential information.

  FIG. 1 is a schematic view of a copying machine 10 provided with an information detection apparatus 100 according to the present invention. FIG. 1 (a) is a block diagram schematically showing the copying machine 10, and FIG. 2 is a schematic perspective view of the machine 10. FIG.

  As shown in FIGS. 1A and 1B, in the copying machine 10, a plurality of magnetic materials 111, 112, 113, and 114 are applied to the document 1 placed on the platen glass 14 of the copying machine 10. In this case, the information copying apparatus 100 that detects at least one of the plurality of magnetic materials 111, 112, 113, and 114 attached to the document 1 and outputs a detection result signal, and the copying machine 10 are collectively controlled. Then, based on the detection result of the information detection apparatus 100, the copying machine 10 is placed on the platen glass 14 with a copy operation prohibiting control for prohibiting the copying operation of copying the image information of the original 1 or the control unit 11 for controlling the copying operation. Light is projected onto the original 1 and the reflected light reflected by the original 1 is received by a photoelectric conversion element (not shown) (for example, CCD = Charge Couple Device). An image reading processing unit 12 that reads an image recorded on the original 1 based on an electric signal converted into a gas signal and converted by a photoelectric conversion element, and image information read by the image reading processing unit 12 is supplied from a paper tray 16. An image generation processing unit 13 that prints out a paper (not shown) and discharges the paper onto a paper discharge tray 17 is provided.

  An information detection device for detecting at least one of the magnetic materials 111, 112, 113, and 114 applied to the document 1 placed on the platen glass 14 is provided inside the platen cover 15 of the copying machine 10. 100 excitation coils 101 and detection coils 102 are arranged, a predetermined alternating magnetic field is transmitted from the excitation coil 101, and the detection coils 102 are magnetic fields generated from the alternating magnetic field and magnetic materials 111, 112, 113, 114. Receives pulses, electromagnetic waves, etc.

  The excitation coil 101 and the detection coil 102 are formed in a circular shape. When the platen cover 15 is closed, the paper surface of the document 1 placed on the platen glass 14 and the excitation coil 101 and the detection coil 102 are formed. It arrange | positions so that each surface to perform may face.

  When the image of the document 1 is copied by the copying machine 10 configured as described above, the document 1 in which the copying machine 10 is placed vertically or horizontally (paper direction) on the platen glass 14 can be copied or cannot be copied. If it is a copy-capable document, a copy operation is performed by receiving a copy instruction, and if it is a copy-disabled document, a copy-prohibit operation is performed.

  Specifically, the document 1 is placed on the platen glass 14 of the copying machine 10 in, for example, a portrait orientation (relative to the scanning direction in which the copying machine 10 scans the document 1), and the platen cover 15 is closed (in the drawing). When a copy start button (not shown) is pressed, the control unit 11 of the copying machine 10 activates and operates the information detection apparatus 100 prior to the copying operation of the document 1.

  When the information detection apparatus 100 operates, a predetermined alternating magnetic field is transmitted from the exciting coil 101, and the alternating magnetic field is received by the original 1 on the platen glass 14, whereby the magnetic materials 111, 112, 113, 114 emits an abrupt magnetic pulse or an electromagnetic wave due to magnetostriction vibration at the time of magnetization reversal.

  Magnetic pulses or electromagnetic waves emitted from the magnetic materials are received by the detection coil 102 and detected by the information detection device 100.

  The control unit 11 of the copying machine 10 cannot copy the document 1 by detecting magnetic pulses or electromagnetic waves emitted from at least one of the magnetic materials 111, 112, 113, and 114 of the document 1 by the information detection apparatus 100. And a message indicating a copy prohibition such as “This document cannot be copied” or a warning sound is output and the copy processing operation is prohibited.

  If the magnetic pulse or electromagnetic wave from the document 1 that has received an alternating magnetic field is not detected by the information detection device 100, the document 1 is identified as a copyable document, and the document 1 placed on the platen glass 14. The image reading processing unit 12 reads the read image information, prints the read image information on the paper fed from the paper tray 16, and discharges it to the paper discharge tray 17.

  As described above, the copying machine 10 identifies whether the document 1 is a copyable document or a non-copyable document before performing the copy processing operation of the document 1 placed on the platen glass 14, and displays the identification result. Accordingly, the copy operation or the copy prohibition operation is controlled accordingly, so that it is possible to prevent an inadvertent copy of a confidential document or the like that cannot be copied, and to suppress unnecessary copy processing operations and to save power in the copying machine 10. Can be achieved.

  Whether or not the information detection apparatus 100 performs the copy processing operation of the document 1 is determined after the document 1 is placed on the platen glass 14 and after the copy start instruction to the copying machine 10 or the copy start instruction. Either of the above may be used, and it is not particularly limited.

  Further, since the number and arrangement position of the magnetic material applied to the document that cannot be copied are the main part of the present invention, detailed description will be given later.

  Here, the configuration of the information detection apparatus 100 will be described with reference to FIG.

  FIG. 2 is a block diagram showing a configuration of a main part of the information detection apparatus 100 according to the present invention. The information detection apparatus 100 applies an alternating magnetic field to a magnetic material applied to a document, and the magnetic material is applied to the alternating magnetic field. By receiving the magnetic material, the magnetic material is configured to detect a magnetic pulse generated at the time of magnetization reversal.

  As shown in FIG. 2, the information detection apparatus 100 generates an AC sine wave and performs control for transmitting a predetermined alternating magnetic field via the excitation coil 101, and the AC sine generated by the excitation circuit 103. An excitation coil 101 for transmitting a predetermined alternating magnetic field based on a wave, a predetermined alternating magnetic field transmitted from the excitation coil 101, and magnetic materials 111, 112 applied to the original 1 when the original 1 receives the alternating magnetic field, 113 and 114 are respectively magnetized, and a detection circuit 104 for detecting at least one or more steep magnetic pulses generated by magnetization reversal of these magnetic materials via the detection coil 102, and detection of an alternating magnetic field detected by the detection circuit 104 A signal processing unit 106 that performs signal processing on at least one detection signal of a signal and a magnetic pulse generated by each magnetic material, and signal processing by the signal processing unit 106 Excitation information so that the detection circuit 104 can detect an alternating magnetic field and a magnetic pulse at a timing corresponding to the period of the alternating magnetic field, and a bit output unit 107 that outputs the presence / absence information of the magnetic material applied to the document 1 based on the received information. A timing control unit 105 that performs timing control between the circuit 103 and the detection circuit 104 is provided.

  In the information detection apparatus 100 configured as described above, for example, the excitation circuit 103 performs control to flow an alternating sine wave current having a frequency of 1 kHz to the excitation coil 101, so that an alternating magnetic field having a frequency of 1 kHz causes the shape of the excitation coil 101 (for example, It occurs in a predetermined space corresponding to a circular shape.

  The timing control unit 105 detects the time when the current value becomes 0 in the rising direction of the current having the frequency of 1 kHz generated by the excitation circuit 103, that is, the time when the current direction reverses from negative to positive. A reference signal is output to the detection circuit 104 at a timing once per period of the alternating magnetic field.

  The detection circuit 104 detects the detection signal received by the detection coil 102 based on the timing of the reference signal output from the timing control unit 105.

  For example, the signal processing unit 106 removes the alternating magnetic field component from the detection signal detected by the detection circuit 104, amplifies the positive signal component of the signal after the alternating magnetic field component removal, removes the noise component, and removes the magnetic material. Detects a pulse signal corresponding to a magnetic pulse generated during magnetization reversal.

  The detection pulse signal detected by the signal processing unit 106 is output to the bit output unit 107, and the bit output unit 107 converts the presence / absence information of the magnetic material expressed by the value “1” or “0” based on the detection pulse signal. The data is converted and output to the control unit 11 of the copying machine 10.

  As described above, the information detection apparatus 100 applies an alternating magnetic field to the document 1 and detects at least one or more magnetic pulses generated when a plurality of magnetic materials applied to the document 1 are reversed in magnetization. It is configured to detect that a magnetic material is applied and output a detection result.

  However, when an alternating magnetic field is applied to the document and the magnetic material applied to the document is received by the magnetic material to detect a magnetic pulse generated when the magnetic material is reversed, the magnetic flux direction of the alternating magnetic field transmitted from the excitation coil In order to further improve the detection accuracy of the magnetic material applied to the document, there is a difference in the detection output of the magnetic pulse generated when the magnetic material is reversed in magnetization depending on the direction of the magnetic material and the easy magnetization axis direction of the magnetic material. In addition, the shape of the detection coil and the positional relationship between each coil and the magnetic material are important factors.

  FIG. 3 shows the magnetic characteristics of the magnetic material according to the shapes of the excitation coil 101 and the detection coil 102 of the information detection apparatus 100 and the arrangement positions of the coils 101 and 102 and the magnetic material applied to the document.

  3, FIG. 3A shows the shapes of the exciting coil 101 and the detection coil 102, and a plurality of magnetic materials 301, 302, 303, 304, 305, 306 applied to the coils 101, 102 and the document 30. FIG. 3B is a diagram showing the magnetic characteristics of the magnetic materials 301 and 306 by receiving the magnetic field generated from the excitation coil 101, and FIG. FIG. 3D is a diagram showing the magnetic characteristics of the magnetic materials 303 and 304 by receiving the magnetic field generated from the coil 101. FIG. 3D shows the magnetic characteristics of the magnetic materials 302 and 305 by receiving the magnetic field generated from the exciting coil 101. FIG.

  As shown in FIG. 3A, magnetic materials 301, 302, 303, 304, 305, and 306 applied to the document 30 are, for example, magnetic material wires made of Fe-Co amorphous material. In a state where the paper surface of the document 30 closed and placed on the platen glass 14 faces each surface formed by the excitation coil 101 and the detection coil 102, each magnetic material is either in the short side direction or the long side direction of the document 30. It is arranged to be parallel to the heel.

  The magnetic material wire has an easy magnetization axis in the length direction of the magnetic material wire, and each magnetic material 301, 302, 303, 304, 305, 306 has the same length and the same wire diameter. It is a magnetic material wire having a coercive force H1.

  Magnetic materials 301 and 306 are formed by circles (circles 101 and 102 indicated by alternate long and short dash lines) formed by the excitation coil 101 and the detection coil 102 obtained by vertically projecting the excitation coil 101 and the detection coil 102 on the paper surface of the document 30. And is arranged parallel to the longitudinal direction at a position where the diameter direction of the coil projected circle is parallel to the longitudinal direction of the document 30.

  In the magnetic materials 301 and 306 arranged in this way, the magnetic flux direction of the alternating magnetic field emitted from the exciting coil 101 is parallel to the easy axis direction of the magnetic materials 301 and 306, and the magnetic materials 301 and 306 are Since the magnetic field strength of the alternating magnetic field generated from the exciting coil 101 at the arranged position is large, the magnetic members 301 and 306 receive the alternating magnetic field generated from the exciting coil 101 and receive the magnetic field as shown in FIG. The magnetic characteristics of the history curve 310 are shown, and the magnetic flux voltage at the coercive force H1 corresponding to the magnetic history curve 310 is measured.

  Further, the magnetic materials 303 and 304 are arranged in the vicinity of the center of the coil projection circle in parallel with the longitudinal direction or the short side direction of the document 30, and are emitted from the exciting coil 101 at the positions where the magnetic materials 303 and 304 are arranged. The magnetic field of the magnetic hysteresis curve 320 as shown in FIG. 3C corresponds to the direction of the magnetic field of the alternating magnetic field generated, the direction of the easy axis of magnetization of the magnetic members 301 and 306, and the magnetic field strength of the alternating magnetic field generated from the exciting coil 101. The magnetic flux voltage at the coercive force H1 corresponding to the magnetic history curve 320 is measured.

  The magnetic history curve 320 is measured with a smaller magnetic flux voltage at the coercive force H <b> 1 than the magnetic history curve 310.

  Further, the magnetic members 302 and 305 are arranged on the coil projection circle and parallel to the longitudinal direction at a position where the diameter direction of the coil projection circle is parallel to the short direction of the document 30.

  Although the magnetic field intensity of the alternating magnetic field emitted from the exciting coil 101 at the position where the magnetic materials 302 and 305 are arranged is large, the magnetic flux direction of the alternating magnetic field emitted from the exciting coil 101 and the easy axis of magnetization of the magnetic materials 302 and 305 Since the directions are perpendicular to each other, the magnetic materials 302 and 305 receive the alternating magnetic field generated from the exciting coil 101 and exhibit the magnetic characteristics of the magnetic history curve 330 as shown in FIG. As indicated by 330, it is difficult to measure the magnetic flux voltage with the coercive force H1.

Next, a magnetic material detection method based on a detection signal waveform detected from the document 30 to which each magnetic material 301, 302, 303, 304, 305, 306 is applied by applying an alternating magnetic field from the excitation coil 101 is shown in FIG. Details will be described with reference to FIG.
FIG. 4 is a diagram corresponding to the detection signal waveform until the magnetic pulse generated by the magnetic materials 301 and 306 receiving the alternating magnetic field is detected in the original 30 shown in FIG.

  4A is a diagram showing the arrangement positions of the magnetic materials 301 and 306, the excitation coil 101, and the detection coil 102 applied to the document 30, and FIG. 4B is an alternating magnetic field generated from the excitation coil 101. FIG. 4C is a diagram showing a detection signal waveform 400 detected by the detection circuit 104 via the detection coil 102, and FIG. FIG. 5 is a diagram illustrating a pulse signal corresponding to a magnetic pulse detected by signal processing by a signal processing unit 106 from a detection signal waveform 400 detected by a detection circuit 104.

  As shown in FIG. 3 described above, the magnetic materials 301 and 306 applied to the document 30 shown in FIG. 4A are the magnetic flux directions of the alternating magnetic field emitted from the exciting coil 101 and the magnetic materials 301 and 306. The magnetic materials 301 and 306 are arranged so that the magnetization easy axis direction is parallel to each other and the magnetic field strength of the alternating magnetic field generated from the exciting coil 101 is large. 4B, the magnetic materials 301 and 306 having the magnetic hysteresis curve 310 as shown in FIG. 4B and having a coercive force H1 are subjected to an alternating magnetic field having a magnetic field strength of approximately H1 or −H1. Magnetization is reversed, and a steep magnetic pulse is emitted at that time.

  The alternating magnetic field and the magnetic pulse generated by the magnetic materials 301 and 306 are received by the detection coil 102 and detected by the detection circuit 104 with a detection signal waveform 400 as shown in FIG.

  As shown in the detection signal waveform 400, the detection signal waveform 400 has an alternating magnetic field waveform 401 detected corresponding to the alternating magnetic field, and the magnetic materials 301 and 306 having the coercive force H1 have substantially the magnetic field strength of the alternating magnetic field. When the magnetic field is changed to H1 or -H1, the magnetization is reversed, and the steep magnetic pulse generated at that time and the detection output pulse signals A and B corresponding to the magnetic field strength are detected.

  The pulse signal A is detected at time t1 when the magnetic field strength of the alternating magnetic field of the detection signal waveform 400 is substantially H1 based on the reference signal output from the timing control unit 105, and the pulse signal B is detected by the detection signal waveform 400. Is detected at time t2 when the magnetic field strength of the alternating magnetic field becomes approximately -H1.

  The detection signal waveform 400 detected by the detection circuit 104 is output to the signal processing unit 106, the signal waveform 401 of the alternating magnetic field component of the detection signal waveform 400 is removed, and the positive signal of the pulse signals A and B is removed. A pulse signal A as a component is detected, further amplified, and after noise components are removed, a detection pulse signal A having a detection output V1 as shown in FIG. 4D is detected.

  The detection pulse signal A detected by the signal processing unit 106 is output to the bit output unit 107, and the bit output unit 107 outputs the detection information of the magnetic materials 301 and 306 in association with the bit information based on the detection pulse signal A. Is done.

  When the detection pulse signal A is detected, “1” indicating that the magnetic material is applied to the document 30. When the detection pulse signal A is not detected, the magnetic material is applied to the document 30. Bit information of “0” indicating that there is no error is output.

  FIG. 5 is a diagram showing the detection signal waveform until the magnetic pulse generated when the magnetic materials 303 and 304 applied to the document 30 receive an alternating magnetic field is detected.

  FIG. 5A is a diagram showing the arrangement positions of the magnetic materials 303 and 304 applied to the document 30 and the coils 101 and 102, and FIG. 5B receives an alternating magnetic field generated from the excitation coil 101. FIG. 5C is a diagram showing a detection signal waveform 500 detected by the detection circuit 104 via the detection coil 102, and FIG. 5D is a detection diagram. It is a figure which shows the pulse signal corresponding to the magnetic pulse detected by the signal processing by the signal processing part from the detection signal waveform 500 detected by the circuit.

  Magnetic materials 303 and 304 applied to the document 30 shown in FIG. 5A are the magnetic flux directions of the alternating magnetic field emitted from the exciting coil 101 at the positions where the magnetic materials 303 and 304 are arranged, and the magnetic materials 303. , 304 shows the magnetic characteristics of the magnetic hysteresis curve 320 as shown in FIG. 5B corresponding to the easy axis direction of magnetization 304 and the magnetic field strength of the alternating magnetic field emitted from the exciting coil 101, and has a coercive force H1. The materials 303 and 304 undergo magnetization reversal by receiving an alternating magnetic field having a magnetic field intensity of approximately H1 or -H1, and at that time, respectively generate steep magnetic pulses.

  The alternating magnetic field and the magnetic pulse generated by the magnetic materials 303 and 304 are received by the detection coil 102 and detected by the detection circuit 104 with a detection signal waveform 500 as shown in FIG.

  As shown in the detection signal waveform 500, the detection signal waveform 500 has an alternating magnetic field waveform 501 detected corresponding to the alternating magnetic field, and the magnetic materials 303 and 304 having the coercive force H1 have substantially the magnetic field strength of the alternating magnetic field. When an alternating magnetic field that is H1 or -H1 is received, magnetization is reversed, and a steep magnetic pulse generated at that time and pulse signals C and D of detection outputs corresponding to the magnetic field strength are detected.

  Note that the pulse signal C has a magnetic field strength of an alternating magnetic field of the detection signal waveform 500 based on the reference signal output from the timing control unit 105 in the same manner as the pulse signal A (see FIG. 4C) described above. The pulse signal D is detected at time t2 when the magnetic field strength of the alternating magnetic field of the detection signal waveform 500 becomes approximately -H1.

  The detection signal waveform 500 detected by the detection circuit 104 is output to the signal processing unit 106, the signal waveform 501 of the alternating magnetic field component in the detection signal waveform 500 is removed, and the positive signal of the pulse signals C and D is removed. A pulse signal C as a component is detected, further amplified and noise component removed, and then a detection pulse signal C having a detection output V2 as shown in FIG. 5D is detected.

  The detection output V2 of the detection pulse signal C is detected with a smaller value than the detection output V1 of the detection pulse signal A.

  The detection pulse signal C detected by the signal processing unit 106 is output to the bit output unit 107. The bit output unit 107 is associated with the bit information based on the detection pulse signal C and indicates that the magnetic material has been detected. 1 "is output in association with the bit information.

  FIG. 6 is a diagram corresponding to detection signal waveforms until a magnetic pulse generated by the magnetic materials 302 and 305 applied to the document 30 receiving an alternating magnetic field is detected.

  FIG. 6A is a diagram showing the arrangement positions of the magnetic materials 302 and 305 applied to the document 30 and the coils 101 and 102, and FIG. 6B receives a magnetic field generated from the excitation coil 101. FIG. 6C is a diagram showing the detection signal waveform 600 detected by the detection circuit 104 via the detection coil 102, and FIG. 6D is a detection circuit. FIG. 6 is a diagram illustrating a pulse signal corresponding to a magnetic pulse detected by signal processing by a signal processing unit 106 from a detection signal waveform 600 detected at 104.

  The magnetic materials 323 and 305 applied to the document 30 shown in FIG. 6A are arranged so that the magnetic field strength of the alternating magnetic field generated from the excitation coil 101 is large, but is generated from the excitation coil 101. Since the magnetic flux direction of the alternating magnetic field and the easy magnetization axis direction of each of the magnetic materials 302 and 305 are perpendicular to each other, the magnetic materials 302 and 305 receive the alternating magnetic field generated from the exciting coil 101 and are shown in FIG. The magnetic characteristics of the magnetic history curve 330 are shown, and the magnetic materials 302 and 305 are hardly magnetized, so that almost no magnetic pulse generated at the time of magnetization reversal is detected.

  Therefore, the detection signal detected by the detection circuit 104 is detected with a detection signal waveform 600 as shown in FIG. 6C, and is almost detected with a waveform signal 601 of an alternating magnetic field.

  The detection signal waveform 600 detected by the detection circuit 104 is output to the signal processing unit 106, and the signal waveform 601 of the alternating magnetic field component in the detection signal waveform 600 is removed and further amplified to remove the noise component. The detection output as shown in FIG. 6 (d) is detected with an almost zero value.

  The detection result in the signal processing unit 106 is output to the bit output unit 107, and the bit output unit 107 is associated with bit information “0” indicating that the magnetic material is not applied to the document 30 based on the detection result. Is output.

  As described above, even when the magnetic material is applied to the document, the shapes of the excitation coil 101 and the detection coil 102 of the information detection apparatus 100 that detects the magnetic material, and the magnetic material and the excitation coil 101 applied to the document. And the detection accuracy of the magnetic material detected by the information detection apparatus 100 differs depending on the arrangement position with the detection coil 102.

  Therefore, in the base material to which the magnetic material according to the present invention is applied and the information detection apparatus 100, the original (base material) placed on the platen glass 14 of the copying machine 10 in the vertical or horizontal direction (paper direction). The shape of the excitation coil 101 and the detection coil 102 of the information detection apparatus 100, the magnetic material applied to the document, the excitation coil 101, and the detection are detected so that the presence or absence of the magnetic material applied to the document such as confidential information can be reliably detected. The configuration is such that the detection accuracy of the magnetic material applied to the document is further improved by the combination with the arrangement position with the coil 102.

  FIG. 7 shows a detection output of a magnetic pulse generated by the magnetic material applied to the document even when the document is placed on the platen glass 14 of the copying machine 10 in any of the vertical, horizontal, front and back directions. 2 is a diagram showing an example of the shape and arrangement of a document 31 provided with a plurality of magnetic materials arranged so that the maximum is detected, the excitation coil 101 and the detection coil 102 of the information detection apparatus 100. FIG.

  For convenience of explanation, the excitation coil 101 and the detection coil 102 are indicated by a single dot and dash line.

  As shown in FIG. 7, the document 31 is a sheet having a length in the short direction of the document 31 and a length in the length direction of b, and the excitation coil 101 and the detection coil 102 of the information detection apparatus 100. (A circle indicated by a one-dot chain line) is a circular coil having a diameter of D.

  The positions where the excitation coil 101 and the detection coil 102 are arranged are as follows: the original 31 is placed horizontally on the platen glass 14 of the copying machine 10 (the state shown in FIG. 7), and the platen cover 15 is closed. When the center positions of 101 and 102 are vertically projected onto the paper surface of the document 31, they are arranged so as to be the positions (a / 2, a / 2) of the document 31.

  The document 31 has magnetic materials 311, 312, 313, 314, 315, 316, 317, and 318 with coercive force Hc arranged at positions (X, Y) from the reference point (0, 0) on the document 31. The magnetic material 311 is ((a−D) / 2, a / 2), the magnetic material 312 is (a / 2, (a−D) / 2), and the magnetic material 313 is (a / 2, (a + D) / 2. ), The magnetic material 314 is ((a + D) / 2, a / 2), the magnetic material 315 is (b− (a + D) / 2, a / 2), and the magnetic material 316 is (b−a / 2, (a−). D) / 2), the magnetic material 317 is arranged at the position calculated by (b−a / 2, (a + D) / 2), and the magnetic material 318 is calculated at (b− (a−D) / 2, a / 2). Is granted.

  The arrangement positions of the magnetic materials are the magnetic materials 311, 312, 313, and 314 on a circle (coil projection circles 101 and 102 indicated by a one-dot chain line) obtained by vertically projecting the coils 101 and 102 onto the paper surface of the document 31. And a virtual projection line formed on the paper surface so as to be symmetrical by rotating the coil projection circles 101 and 102 by 180 degrees about the bisector 321 that bisects the longitudinal direction of the document 31 as an axis. At least one or more of magnetic materials 315, 316, 317, and 318 disposed on the circles 103 and 104 (circles 103 and 104 indicated by broken lines, hereinafter referred to as “virtual circles”) are provided. Therefore, even if the original 31 is placed on the platen glass 14 of the copying machine 10 in any of the vertical, horizontal, front, and back directions, any one of the magnetic materials applied to the original 31 is selected. Some magnetic material That the detection output of the magnetic pulses emitted by receiving an alternating magnetic field from the exciting coil 101 of the magnetic pulse such that maximum.

  Magnetic materials 311, 312, 313, and 314 disposed on the coil projection circles 101 and 102 (circles indicated by alternate long and short dash lines) and magnetism disposed on the virtual circles 103 and 104 (circles indicated by broken lines). The materials 315, 316, 317, and 318 are arranged such that the magnetic materials 311, 314, 315, and 318 are arranged in parallel to the longitudinal direction of the document 31 in accordance with the vertical and horizontal positions of the document 31, and the magnetic materials 312, 313, and 316 are arranged. 317 are arranged in parallel to the short direction of the document 31, and each magnetic material has the same length.

  Whether the original is placed on the platen glass 14 of the copying machine 10 in any of the vertical, horizontal, front, and back directions based on the position of each magnetic material applied to the original 31, it is applied to the original. A specific example in which the detection output of the magnetic pulse generated by any one of the plurality of magnetic materials is maximized will be described in detail with reference to FIGS.

  FIG. 8 shows magnetic materials 311 and 312 and virtual circles 103 and 104 (circles indicated by broken lines) arranged on the coil projection circles 101 and 102 (circles indicated by alternate long and short dash lines) shown in FIG. FIG. 3 is a diagram illustrating an example of a document 32 to which magnetic materials 317 and 318 arranged on the sheet are provided.

  In FIG. 8, the document 32 is a diagram showing a reference surface and a horizontally placed state when the document 32 is horizontally placed on the platen glass 14 of the copying machine 10.

  As shown in FIG. 8, each of the magnetic materials 311, 312, 317, and 318 is composed of ((a−D) / 2, a / 2) and the magnetic material 312 as shown in FIG. Is (a / 2, (a-D) / 2), the magnetic material 317 is (ba-2, (a-D) / 2), the magnetic material 318 is (b- (a-D) / 2, a / 2) is provided at a predetermined position on the document 32, and the center position of each of the coils 101 and 102 of the information detection apparatus 100 is the position (a / 2, a / 2) of the document 32. It is arranged to be.

  For example, when the document 32 is A4 size paper and the diameter D of the excitation coil 101 and the detection coil 102 is “180” mm, the length “a” in the short direction of the document 32 is “210” mm and the length “b” in the longitudinal direction. Is “297” mm, the arrangement position (X, Y) of the magnetic material 311 on the paper surface of the document 32 is (15, 105), the magnetic material 312 is (105, 15), the magnetic material 317 is (192, 195), The magnetic material 318 is calculated by (282, 105).

  When the original 32 is placed on the platen glass 14 of the copying machine 10 in the vertical, horizontal, front, and back directions, the excitation coil 101 and the detection coil 102 as shown in FIG. 313, 317, and 318 are arranged.

  FIG. 9 shows magnetic materials and excitation coils when the original 32 to which magnetic materials 311, 312, 317, and 318 are applied is placed on the platen glass 14 of the copying machine 10 sideways and on the front and back of the paper. It is a figure which shows the arrangement position with 101 and the detection coil 102. FIG.

  FIG. 9A is a diagram showing a reference document, the horizontally placed document 32 when the document 32 shown in FIG. 8 is placed on the platen glass 14, and FIG. FIG. 9 is a view showing a surface and a horizontally placed document 32 in which the surface and the horizontally placed document 32 (reference paper surface) shown in FIG. FIG. 9C is a diagram showing the back side and the landscape-oriented document 32 obtained by rotating the surface 32 and the landscape-oriented (reference paper surface) document 32 shown in FIG. FIG. 9D is a diagram showing a reverse side of the paper, which is a reverse side of the paper surface by rotating the front side and the horizontal side document 32 (reference paper surface) shown in FIG. FIG.

  FIG. 10A is a view showing the original document 32, which is a reference surface when the document 32 is placed vertically on the platen glass 14, and FIG. 10B is a diagram showing FIG. FIG. 10C is a diagram showing the surface and the vertically placed document 32 in which the longitudinal direction and the lateral direction are each turned upside down by rotating the surface and the vertically placed document 32 (reference paper surface) shown in FIG. FIG. 10A is a diagram showing the back side of the front side and the vertical side of the original 32 shown in FIG. 10A, and the vertical side (reference paper side) of the original 32 rotated 180 degrees around the longitudinal direction, and the vertical side of the original 32. FIG. 10 (d) shows the back side and the vertically placed document 32 obtained by rotating the front side and the vertically placed original document 32 (reference paper surface) shown in FIG. FIG.

  As shown in FIGS. 9A and 9C, the front and landscape originals 32 (reference paper surface) (see FIG. 9A) and the back and landscape originals 32 (see FIG. 9C). The magnetic material 311, 312 is parallel to the magnetic flux direction of the alternating magnetic field emitted from the excitation coil 101 and the easy magnetization axis direction of the magnetic material of the magnetic material 311, 312, and the magnetic field intensity emitted from the excitation coil 101 is large. Since the magnetic material 311, 312 receives the alternating magnetic field, the magnetic material 311, 312 undergoes magnetization reversal when the magnetic field strength of the alternating magnetic field received by the magnetic material 311, 312 becomes approximately Hc or −Hc, and a steep magnetic pulse with a large detection output at that time And the information detection device 100 detects the magnetic pulse.

  Also, as shown in FIGS. 9B and 9D, the front and landscape originals 32 (see FIG. 9B) and the back and landscape originals 32 (see FIG. 9D) are the same. The magnetic material 317, 318 is an alternating magnetic field in which the magnetic flux direction of the alternating magnetic field emitted from the exciting coil 101 is parallel to the magnetization easy axis direction of the magnetic material of the magnetic material 317, 318 and the magnetic field intensity emitted from the exciting coil 101 is large. Therefore, when the magnetic field strength of the alternating magnetic field received by the magnetic materials 317 and 318 is substantially Hc or -Hc, the magnetic materials 317 and 318 are reversed in magnetization, and at this time, a steep magnetic pulse with a large detection output is emitted. The information detection device 100 detects the magnetic pulse.

  Further, as shown in FIGS. 10A and 10C, the front side and the portrait document 32 (reference paper surface) (see FIG. 10A) and the back side and the landscape document 32 (FIG. 10C). The magnetic field intensity generated by the excitation coil 101 is parallel to the magnetic flux direction of the alternating magnetic field generated by the magnetic materials 311 and 312 from the excitation coil 101 and the easy axis of magnetization of the magnetic material of the magnetic materials 311 and 312. Receives a large alternating magnetic field, the magnetic materials 311 and 312 are reversed in magnetization when the magnetic field intensity of the alternating magnetic field received by the magnetic materials 311 and 312 is substantially Hc or -Hc, and the detection output is steep and large at that time. A magnetic pulse is emitted, and the information detection device 100 detects the magnetic pulse.

  Also, as shown in FIGS. 10B and 10D, the front side and portrait document 32 (see FIG. 10B) and the back side and portrait document 32 (see FIG. 10D) are arranged. The magnetic material 317, 318 is an alternating magnetic field in which the magnetic flux direction of the alternating magnetic field emitted from the exciting coil 101 is parallel to the magnetization easy axis direction of the magnetic material of the magnetic material 317, 318 and the magnetic field intensity emitted from the exciting coil 101 is large. Therefore, when the magnetic field strength of the alternating magnetic field received by the magnetic materials 317 and 318 is substantially Hc or -Hc, the magnetic materials 317 and 318 are reversed in magnetization, and at this time, a steep magnetic pulse with a large detection output is emitted. The information detection device 100 detects the magnetic pulse.

  As described above, when the excitation coil 101 and the detection coil 102 of the information detection apparatus 100 are circular, the length of the original, the length in the short direction, the diameters of the excitation coil and the detection coil, and the coils By using a document with a plurality of magnetic materials applied to the position specified based on the center position on the document, the detection output of the magnetic material applied to the document is greatly detected, and the detection accuracy of the magnetic material is improved. More improved.

  In the document 32 shown in FIG. 8, the four magnetic members 311, 312, 317, and 318 are provided at predetermined positions on the document 32. Although the configuration example in which there are always two magnetic materials that maximize the detection output of the magnetic pulse generated by the magnetic material even when placed in the paper direction is shown, the magnetic material arranged at a predetermined position of the document 32 The magnetic material is emitted even if the original document described above is placed in any of the front, back, vertical and horizontal paper directions, even if the original is provided with any one of 311 and 312 and one of the magnetic materials 317 and 318. There is one magnetic material that maximizes the detection output of the magnetic pulse, and it is possible to reliably detect the magnetic material applied to the document.

  Further, when all of the eight magnetic materials 311, 312, 313, 314, 315, 316, 317, 318 are applied as in the original 31 shown in FIG. Since there are always four magnetic materials that maximize the detection output of the magnetic pulse generated by the magnetic material regardless of the paper direction, the detection accuracy of the magnetic material applied to the document is further improved.

  As described above, at least one of the magnetic materials 311, 312, 313, and 314 arranged on the coil projection circles (circles indicated by alternate long and short dash lines) 101 and 102 obtained by vertically projecting the coils 101 and 102 onto the paper surface of the document 31. Arranged on virtual circles (circles indicated by broken lines) 103 and 104 obtained by rotating the coil projection circles 101 and 102 180 degrees around one or more and a bisector 321 that bisects the longitudinal direction of the document 31 Since at least one of the magnetic materials 315, 316, 317, and 318 is disposed and applied, the original 31 is placed on the platen glass 14 of the copying machine 10 in any of vertical, horizontal, front, and back sides. Even when the magnetic material is placed in the direction, the magnetic pulse from the exciting coil 101 is applied to the magnetic pulse that maximizes the detection output of the magnetic pulse of any magnetic material applied to the document 31. Since emits by receiving it is possible to detect the magnetic material applied to the original document reliably.

  In addition, when the excitation coil 101 and the detection coil 102 of the information detection apparatus 100 are circular, at least a magnetic material is provided on the coil projection circles (circles indicated by alternate long and short dash lines) 101 and 102 in parallel with the diameter direction of the circle. One or more and virtual circles (circles indicated by broken lines) 103 and 104 on the document are arranged and provided on at least one or more magnetic materials in parallel with the diameter direction of the circle, so that the document can be copied from the copying machine 10. Even when placed on the platen glass 14 in any of the vertical, horizontal, front, and back directions, the detection output of the magnetic pulse generated by any one of the magnetic materials applied to the document is generated. Since the maximum magnetic pulse is generated by receiving an alternating magnetic field from the exciting coil 101, the magnetic material applied to the document can be reliably detected.

  So far, the description has been made assuming that the excitation coil and the detection coil of the information detection apparatus according to the present invention have a circular shape.

  Next, a description will be given assuming an information detection device in which two sets of rectangular excitation coils and detection coils are arranged.

  FIG. 11 shows the detection output of the magnetic pulse generated by the magnetic material applied to the document even when the document is placed on the platen glass 14 of the copying machine 10 in any of the vertical, horizontal, front and back directions. An example of each shape of the original 33 provided with a plurality of magnetic materials arranged so that the detection is detected at maximum, the excitation coil 121 and the detection coil 122 of the information detection apparatus 200, and the excitation coil 123 and the detection coil 124 FIG.

In FIG. 11, the information detection device 200 and its configuration are not shown, but the information detection device 200 includes the excitation coil 101 and the detection coil 102 of the information detection device 100 shown in FIG. It replaces with the detection coil 122, the excitation coil 123, and the detection coil 124, and it is comprised so that the magnetic field of the same direction may be formed in each coil side where the excitation coil 121 and the excitation coil 123 adjoin. Since the other configuration and operation are the same as the operation of the magnetic material detection 100, details of the configuration and operation of the information detection device 200 are omitted.
As shown in FIG. 11, the excitation coils 121 and 123 and the detection coils 122 and 124 (rectangles indicated by alternate long and short dash lines) of the information detection apparatus 200 have a rectangular shape, and the excitation coil 121, the detection coil 122, and the excitation The coil 123 and the detection coil 124 form a set, and two sets of excitation coils and detection coils are arranged inside the platen cover 15 of the copying machine 10.

  In addition, the exciting coils 121 and 123 and the detection coils 122 and 124 formed in a rectangular shape include a sheet surface of the document 33 placed on the platen glass 14 by closing the platen cover 15 and each surface formed by each coil. Are arranged so as to face each other.

  In the document 33, the magnetic material 332 is placed at the position of an intersection C between a bisector 341 that bisects the longitudinal direction of the document 33 and a bisector 342 that bisects the short direction of the document 33. The bisector 341 is arranged so as to bisect the magnetic material 332, and the magnetic materials 331 and 333 are parallel to the lateral direction of the document 33 and 2 respectively. The magnetic material 332 is arranged and provided in the vicinity of the equipartition line 341 so as to face each other with the magnetic material 332 interposed therebetween.

  In addition, the length of each magnetic material is the same, and the length is larger than the separation distance of the exciting coil 121 and the exciting coil 123 by the side of each coil in which the exciting coil 121 and the exciting coil 123 adjoin.

  In addition, the exciting coil 121 and the exciting coil 123, and the detecting coil 122 and the detecting coil 124 are formed by vertically projecting each coil onto the paper surface of the document 33 (a rectangle indicated by a one-dot chain line) about the bisector 341. Are arranged so as to be symmetrical.

  FIG. 12 shows each of the cases where the original 33 provided with the magnetic materials 331, 332, and 333 shown in FIG. 11 is placed on the platen glass 14 of the copying machine 10 in the horizontal direction and on the front and back sides of the paper. It is a figure which shows the arrangement | positioning position of a magnetic material, the excitation coil 121, the detection coil 122, the excitation coil 123, and the detection coil 124. FIG.

  FIG. 12A is a diagram showing a reference document when the document 33 is placed horizontally on the platen glass 14 and the horizontally placed document 33. FIG. 12B is a diagram showing FIG. FIG. 12 (c) is a diagram showing the front side, the horizontal document 33 (reference paper surface) rotated 180 degrees and the surface and the horizontal document 33 in which the longitudinal direction and the short side direction are overturned. FIG. 12D is a diagram showing the back side of the original document 33 placed on the front side and the landscape (reference paper) shown in FIG. ) Is a diagram showing the back side and the horizontally placed document 33 obtained by rotating the front side and the horizontally placed document 33 (reference sheet surface) shown in FIG. is there.

  FIG. 13A is a diagram showing the reference document 33, which is a reference surface when the document 33 is placed vertically on the platen glass 14, and FIG. 13B is a diagram showing FIG. FIG. 13C is a view showing the surface 33 and the vertically placed document 33 in which the longitudinal direction and the short side direction are turned upside down by rotating the surface and the vertically placed document 33 (reference paper surface) shown in FIG. FIG. 13A is a diagram showing the back side of the original document 33 placed in the vertical direction (reference paper surface) shown in FIG. FIG. 13D shows the back side and the vertical document 33 in which the front side and the vertical document 33 (reference paper surface) shown in FIG. 13A are rotated 180 degrees around the short side direction and the paper surface is reversed. FIG.

  As shown in FIGS. 12A to 12D, when the document 33 is placed sideways, the document 33 is rotated 180 degrees on the same sheet of the document 33 so that the longitudinal direction and the short direction of the document 33 are upside down. Regardless of whether the paper 33 is placed upside down or the paper surface of the original 33 is front or back, the magnetic material 332 has a magnetic flux direction of an alternating magnetic field emitted from the excitation coils 121 and 123 and an easy magnetization axis of the magnetic material of the magnetic material 332. The magnetic material 332 is parallel to the direction and receives the alternating magnetic field generated by the exciting coils 121 and 123 and has a large magnetic field strength. Therefore, when the magnetic field strength of the alternating magnetic field received by the magnetic material 332 becomes approximately Hc or -Hc, The magnetization is reversed, and a steep magnetic pulse having a large detection output is emitted at that time, and the magnetic pulse is detected by the information detection device 200.

  Further, as shown in FIGS. 13 (a) and 13 (d), the front side, portrait document 33 (reference paper surface) (see FIG. 13 (a)) and the back side, portrait document 33 (FIG. 13 (d)). The magnetic material 331 is arranged in the same manner with respect to each coil, the magnetic material 331 is parallel to the magnetic flux direction of the alternating magnetic field emitted from the excitation coils 121 and 123, and the magnetization easy axis direction of the magnetic material 331 is excited. Since the magnetic field intensity generated from the coils 121 and 123 receives an alternating magnetic field, when the magnetic field intensity of the alternating magnetic field received by the magnetic material 331 becomes approximately Hc or -Hc, the magnetic material 331 reverses magnetization and is detected at that time. A steep magnetic pulse having a large output is emitted, and the magnetic pulse is detected by the information detection device 200.

  Further, as shown in FIGS. 13B and 13C, the front side and the vertical document 33 (see FIG. 13B) and the back side and the vertical document 33 (see FIG. 13C). The magnetic material 333 is arranged in the same manner with respect to each coil, the magnetic material 333 is parallel to the magnetic flux direction of the alternating magnetic field emitted from the excitation coils 121 and 123, and the magnetization easy axis direction of the magnetic material 333, and the excitation coil 121. , 123 receives an alternating magnetic field having a large magnetic field strength, so that the magnetic material 333 undergoes magnetization reversal when the magnetic field strength of the alternating magnetic field received by the magnetic material 333 becomes approximately Hc or -Hc, and the detection output is generated at that time. A large and steep magnetic pulse is emitted, and the magnetic pulse is detected by the information detection apparatus 200.

  In the above description, the information detection apparatus 100 or the information for detecting the magnetic material applied to the document based on the detection result of the magnetic pulse generated when the magnetic material is reversed when the magnetic material is applied with the alternating magnetic field applied to the magnetic material. The example of the copying machine 10 provided with the detection device 200 has been described.

  Here, an information detecting device 300 that applies an alternating magnetic field to a magnetic material applied to a document and detects the magnetic material applied to the document based on a detection result of an electromagnetic wave generated by the magnetostrictive vibration of the magnetic material is a copying machine. 10 will be described.

  Note that the information detection device 100 or 200 of the copying machine 10 is replaced with the information detection device 300, and a magnetic material having a magnetic property such that the magnetic material detectable by the information detection device 300 receives a magnetic field and vibrates magnetostrictively is applied to the document. Other than the above, since the configuration and operation of the copy 10 described above are the same, the configuration of the information detection device 300 and the operation in which the information detection device 300 detects the magnetic material applied to the document are described here. Will be described in detail.

  FIG. 14 is a block diagram illustrating a configuration of a main part of the information detection apparatus 300.

  As shown in FIG. 14, the information detection device 300 applies a predetermined alternating magnetic field to the magnetic materials 411, 412, 413, and 414 applied to the document 34, and detects electromagnetic waves generated by the magnetostrictive vibration of each magnetic material. The presence / absence of the magnetic material applied to the document 34 is detected.

  The alternating magnetic field transmitted from the exciting coil 125 sequentially changes from a predetermined low frequency to a predetermined high frequency, and when the predetermined high frequency is reached, the alternating magnetic field is repeatedly changed from the predetermined low frequency to the predetermined high frequency again. It is configured as follows.

  Specifically, the configuration of the information detection device 300 is transmitted from the excitation coil 125 and an excitation circuit 203 that performs control for transmitting a predetermined alternating magnetic field that sequentially changes from a low frequency to a high frequency via the excitation coil 125. By receiving a predetermined alternating magnetic field, the magnetic material applied to the document 34 undergoes magnetostrictive vibration, and a detection circuit 204 that detects an electromagnetic wave generated at that time through a detection coil 126 by a voltage signal, and a detection circuit 204 A bit output unit 207 that outputs a bit of the presence / absence information of the magnetic material applied to the document 34 based on the detected signal, and a frequency control circuit 205 that controls the frequency of the excitation circuit 203 and the detection circuit 204 are provided.

  The frequency control circuit 205 performs a control operation such as band limitation of a set frequency of a detection circuit 205 such as a band-pass filter circuit (not shown) corresponding to the frequency of the alternating magnetic field generated by the excitation circuit 203.

  The information detection apparatus 300 configured as described above supplies a voltage to a voltage control oscillation circuit (not shown) (for example, VCO = Voltage Controlled Oscillator) in the excitation circuit 203, for example, and the voltage controlled by the voltage control oscillation circuit Is generated, and the generated waveform signal is amplified to transmit an alternating magnetic field that changes linearly from a low frequency to a high frequency or from a high frequency to a low frequency via the exciting coil 125. Perform such control.

  Here, an alternating magnetic field that changes linearly continuously from a predetermined low frequency to a predetermined high frequency is intermittently transmitted.

  Specifically, after transmitting a predetermined low-frequency alternating magnetic field for a certain period of time, stop transmitting for a certain period of time, then transmit an alternating magnetic field of the next highest predetermined frequency for a certain period of time, then stop transmitting for a certain period of time, and then sequentially transmit the same The transmission stop is repeated until a predetermined high frequency is reached.

  Then, when the frequency of the alternating magnetic field reaches a predetermined high frequency, the operation of transmitting and stopping the alternating magnetic field that changes linearly continuously from the predetermined low frequency to the predetermined high frequency is repeated.

  As described above, the exciting coil 125 intermittently emits an alternating magnetic field that continuously and linearly changes from a predetermined low frequency to a predetermined high frequency from the exciting coil 125, and the detection circuit 204 is configured so that each magnetic material generates an alternating magnetic field. The electromagnetic wave generated by the magnetic material applied to the document 34 is detected through the detection coil 126 by receiving the magnetostrictive vibration, and the presence / absence information of the magnetic material of the document 34 is set to “1” or “0” based on the detection signal. Bit output by value.

  Specifically, an electromagnetic wave generated by magnetostrictive vibration of at least one of the magnetic materials detected through the detection coil 126 is detected as a voltage signal reception signal, and is detected in the detection circuit 204. The presence of the magnetic material that has been filtered by a bandpass filter circuit (not shown), amplified by an amplifier circuit (not shown), and applied to the document 34 is output to the bit output unit 207 as a detection signal.

  Based on the input detection signal, the bit output unit 207 converts it into bit information expressed by a value of “1” or “0”, and outputs it to the control unit 11 of the copier 10.

  The bit output unit 207 represents, for example, a value of “1” when an electromagnetic wave emitted from the magnetic material applied to the document 34 is detected, and represents a value of “0”, for example, when it is not detected. Is output.

  An operation in which the information detection apparatus 300 configured as described above detects at least one magnetic material among the magnetic materials applied to the document 34 will be described in detail with reference to FIG.

In FIG. 15, FIG. 15A is a diagram showing the document 34 provided with magnetic materials 411, 412, 413, and 414, and FIG. 15B is detected by the detection circuit 204 of the information detection apparatus 300. 6 is a diagram illustrating an example of a detection signal of an electromagnetic wave emitted from at least one of the magnetic materials applied to the original document 34. FIG.
As shown in FIG. 15A, the original 34 has magnetic members 411, 412, 413, 414 at positions corresponding to the arrangement of the magnetic members 311, 312, 313, 314 of the original 32 shown in FIG. Is granted.

  Each of the magnetic materials 411, 412, 413, and 414 is a thin thin foil magnetic material such as ferrite or amorphous, and has a so-called magnetostriction characteristic that causes a dimensional change by receiving a magnetic field from the outside.

  Each magnetic material is equal in length and has the same resonance frequency (for example, f1, details will be described later).

  When each magnetic material is given a predetermined alternating magnetic field that changes sequentially from low frequency to high frequency, or from high frequency to low frequency, each magnetic material has the largest magnetostriction when it receives an alternating magnetic field of a specific frequency. Vibrate.

  In addition, the frequency of the alternating magnetic field at which each magnetic material has the largest magnetostrictive vibration varies depending on the coercive force corresponding to the size, shape, etc. of each magnetic material. And “resonance frequency”).

  Conversely, each magnetic material undergoes magnetostrictive vibration, causing each magnetic material to undergo a dimensional change, and electromagnetic waves are emitted from each magnetic material.

  For this reason, when an alternating magnetic field corresponding to the resonance frequency unique to the magnetic material is applied to the document 34 to which each magnetic material is applied, the direction of the magnetic flux of the alternating magnetic field and the easy axis of magnetization of the magnetic material are determined. It is possible to detect the presence of any one of the magnetic materials applied to the document 34 by detecting the electromagnetic waves emitted by the magnetic materials arranged in parallel with the greatest magnetostriction vibration. it can.

  Specifically, when the magnetic material having the resonance frequency f1 that undergoes the largest magnetostrictive vibration in response to the alternating magnetic field receives an alternating magnetic field that sequentially changes from a predetermined low frequency to a predetermined high frequency that is emitted via the exciting coil 125, the alternating material When the frequency of the magnetic field is near f1, the magnetic material vibrates magnetostrictively and emits electromagnetic waves.

  The electromagnetic wave emitted from the magnetic material is received through the detection coil 126 and detected by the detection circuit 204 with a detection signal L as shown in FIG.

  Based on the detection signal L detected by the detection circuit 204, the bit output unit 207 associates, for example, information on the presence / absence of the detection signal when the frequency of the alternating magnetic field is near f1 with the bit information, as shown in FIG. When the detection signal L as shown is detected from the manuscript 34, the bit output unit 207 associates the detection signal in the vicinity of the frequency f1 of the alternating magnetic field with the information “1” and “1” based on the detection signal. The detection result of the presence / absence of the magnetic material applied to the document 34 is output as bit information “1”.

  The information detection device 300 intermittently transmits an alternating magnetic field that continuously and linearly changes from a predetermined low frequency to a predetermined high frequency via the exciting coil 125, and transmission of the alternating magnetic field is temporarily stopped. Since electromagnetic waves generated by magnetostrictive vibrations of the magnetic materials 411, 412, 413, and 414 are received through the detection coil 126 within the time, the excitation coil 125 may also serve as the detection coil 126.

  Until now, the excitation coils 101, 121, 123, and 125 and the detection coils 102, 122, 124, and 126 of the information detection devices 100, 200, and 300 are arranged inside the platen cover 15 of the copying machine 10, and the copying machine 10 Although the description has been made on the assumption that the detection output of the magnetic material applied to the document placed on the platen glass 14 can be detected at the maximum, the arrangement positions of the excitation coil and the detection coil are the information detection apparatuses 100 and 200. , 300 can be detected at the maximum by detecting the magnetic material applied to the document by arranging the exciting coil and the detecting coil at the optimum positions according to the application and the application.

  Specifically, the case of the multifunction machine 20 of FIG. 16 will be described as an example. As shown in FIG. 16, FIG. 16A is a diagram showing a schematic perspective view of the multifunction machine 20, FIG. FIG. 16C is an enlarged view of the arrangement position where the exciting coil 127 and the detection coil 128 are arranged in the multifunction machine 20 shown in FIG. 16A. It has the function of the machine.

  When reading an image of a document, the multifunction device 20 places a document on the platen glass 204 (see FIG. 16B) of the multifunction device 20 for copying, and a document insertion port 202 (FIG. 16). It is configured to be able to read and copy an image of a document while moving the document inserted from (a) along the document movement path, and detect information in the platen cover of the multifunction device 20. The excitation coil 127 and the detection coil 128 of the apparatuses 100, 200, and 300 are disposed, and the detection output of the magnetic material applied to the original placed on the platen glass 204 or the original inserted from the original insertion port 202 is maximized. It is good also as a structure which can detect by.

  The magnetic material applied to the document receives an alternating magnetic field from the excitation coil 127, and a magnetic pulse or an electromagnetic wave generated by magnetostriction vibration generated at the time of magnetization reversal is received by the detection coil 128, and the information detection devices 100, 200, Detection is performed in the same manner as the detection operation 300.

  Further, an excitation coil 127 and a detection coil 128 are disposed on the lower surface of the paper discharge tray 204 of the multifunction device 20 (see FIG. 16C), and confidential information is printed on a sheet provided with a magnetic material. A configuration may be adopted in which the printed output printed by 20 is discharged to the discharge tray 204 so that the detection output of the magnetic material applied to the printed matter can be detected at the maximum.

  In this case, the printed material from which the magnetic material has been detected out of the printed material stored on the paper discharge tray 204 is removed from the paper discharge tray 204, so that the magnetic material is not detected, and a notification sound is generated at that time. By notifying that a printed matter on which confidential information or the like has been printed has been taken out from the paper discharge tray 204, it is possible to prevent a confidential matter from being taken out by an unauthorized person. .

Schematic diagram of a copying machine 10 provided with an information detection apparatus 100 according to the present invention. The block diagram which shows the structure of the principal part of the information detection apparatus 100 The figure which shows the magnetic characteristic of the magnetic material by the arrangement | positioning position of the magnetic material provided to the original, the exciting coil 101, and the detection coil 102 The figure which shows the detection signal waveform of the magnetic pulse which the magnetic materials 301 and 306 generate | occur | produce. The figure which shows the detection signal waveform of the magnetic pulse which the magnetic materials 303 and 304 emit. The figure which shows the detection signal waveform of the magnetic pulse which the magnetic materials 302 and 305 generate | occur | produce. The figure which shows the arrangement | positioning position of the magnetic material provided to an original, and the shape and arrangement position of each coil so that the detection output of the magnetic pulse which the magnetic material provided to the original may emit may be detected at the maximum. FIG. 4 is a diagram showing a document 32 provided with four magnetic materials so that the detection output of a magnetic pulse emitted from the magnetic material applied to the document is detected at the maximum. The figure which shows the positional relationship of each coil and four magnetic materials corresponding to the paper surface (front and back) at the time of placing the original document 32 horizontally. The figure which shows the positional relationship of each coil and four magnetic materials corresponding to the paper surface (front and back) at the time of placing the original document 32 vertically. The figure which shows the arrangement | positioning position of the magnetic material provided to the original document 33 from which the detection output of the magnetic pulse which a magnetic material emits in the case where each coil shape is rectangular and 2 sets are arrange | positioned. The figure which shows the positional relationship of each coil and three magnetic materials corresponding to the paper surface (front and back) at the time of placing the original 33 horizontally. The figure which shows the positional relationship of each coil corresponding to the paper surface (front and back) at the time of placing the original document 33 vertically and three magnetic materials The information detection apparatus 100 is a block diagram showing the configuration of the main part of the information detection apparatus 200 that detects a magnetic material having a magnetic property that vibrates magnetostrictively. The figure which shows the detection signal waveform of the electromagnetic waves which the magnetic materials 411, 412, 413, 414 which generate | occur | produces a magnetostriction vibration The figure which shows an example of the arrangement position of each coil of the information detection apparatuses 100 and 200 applied to the multifunctional machine 20

Explanation of symbols

1, 30, 31, 32, 33, 34 Document 10 Copying machine 11 Control unit 12 Image reading processing unit 13 Image generation processing unit 14 Platen glass 15, 201 Platen cover 16 Paper tray 17, 204 Paper discharge tray 20 Multifunction device 100, 200, 300 Information detection device 202 Document insertion slot 203 Document discharge tray 101, 121, 123, 125, 127 Excitation coil 102, 122, 124, 126, 128 Detection coil 111, 112, 113, 114, 301, 302, 303 304, 305, 306, 311, 312, 313, 314, 315, 316, 317, 318, 331, 332, 333 Magnetic material (having magnetic properties of the large Barghausen effect)
103, 203 Excitation circuit 104, 204 Detection circuit 105 Timing control unit 106 Signal processing unit 310 Magnetic history curve (magnetic material 301, 306)
320 Magnetic history curve (magnetic material 303, 304)
330 Magnetic history curve (magnetic material 302, 305)
341 Vertical bisector in the longitudinal direction of the document 33 342 Vertical bisector in the short direction of the document 33 401, 501, 601 Alternating magnetic field signal waveform 400 Detection signal waveform (magnetic materials 301, 306)
500 Detection signal waveform (magnetic material 303, 304)
600 Detection signal waveform (magnetic material 302, 305)
411, 412, 413, 414 Magnetic material (having magnetostrictive magnetic properties)

Claims (6)

Information detection for detecting information on a base material corresponding to the magnetic material by applying a magnetic material to the base material and detecting a magnetic field change by the magnetic material by a detection coil by applying a magnetic field to the base material from an excitation coil In the device
The information detection apparatus, wherein the excitation coil is arranged so that a magnetic flux direction of the excitation coil and a longitudinal direction of the magnetic material are substantially parallel, and the magnetic material is applied to the base material. The substrate is
The information detection apparatus according to claim 1, wherein the information detection apparatus is a printing sheet on which a desired image is printed by a printer or a copying sheet on which a desired image is copied by a copying machine. The magnetic material is
The information detection device according to claim 1, wherein the information detection device is a magnetic material wire. The detection coil is
The information detection device according to any one of claims 1 to 3, wherein a magnetic field change at the time of magnetization reversal of the magnetic material is detected. The detection coil is
The information detection device according to any one of claims 1 to 3, wherein a magnetic field change due to magnetostrictive vibration of the magnetic material is detected. Information detection for detecting information on a base material corresponding to the magnetic material by applying a magnetic material to the base material and detecting a magnetic field change by the magnetic material by a detection coil by applying a magnetic field to the base material from an excitation coil In the method
The information detecting method, wherein the exciting coil is arranged so that a magnetic flux direction of the exciting coil and a longitudinal direction of the magnetic material are substantially parallel, and the magnetic material is applied to the base material.

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