JP2007025920A - Authenticity deciding method and device for paper sheet by rigidity two-dimensional distribution thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for acquiring the rigidity (strength) detection signal of paper sheet, and for preparing rigidity two-dimensional distribution from the acquired rigidity detection signal, and for deciding authenticity from the prepared rigidity two-dimensional distribution. <P>SOLUTION: A paper sheet is wound around a flexible roller to rotate a drive roller, and a detection roller moves on the drive roller to scan the paper sheet wound around the drive roller. When the detection roller scans the paper sheet, a rigidity detection device mounted on the detection roller acquires a rigidity detection signal, and simultaneously acquires a position detection signal, and the acquired rigidity detection signal and position detection signal are fitted to each other so that the rigidity two-dimensional distribution can be prepared, and the authentication discrimination of the paper sheet is carried out from the rigidity two-dimensional distribution. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and apparatus for acquiring a stiffness (waist strength) signal of a paper sheet, creating a stiffness two-dimensional distribution from the obtained stiffness detection signal, and determining authenticity from the created stiffness two-dimensional distribution. .

  In recent years, vending machines, ATMs and banks have been automating the transaction of paper sheets such as banknotes, securities, stock certificates and stamps. Increasingly, transactions are processed frequently.

  Typical methods for automatically determining authenticity include magnetic pattern reading, shape detection, reflection and transmission detection when irradiated with visible light and infrared light, and fluorescence emission detection by ultraviolet irradiation. And the like.

  On the other hand, in a mechanical device for performing automatic transaction of paper sheets, it is preferable to pass the paper with little wear, and it is necessary to collect the worn paper sheets.

  As a typical method for evaluating the wear and tear of paper sheets, sound generated when an object such as a roller contacts a paper sheet is collected by a microphone, and the rigidity of the paper sheet is evaluated based on the sound (frequency). A method for evaluating the rigidity of a paper sheet based on the amount of deflection of the paper sheet when it is sandwiched and conveyed between two sets of rollers (consisting of a total of four) having different rotation speeds, and a paper sheet There is a method of evaluating the rigidity of the paper sheet by the reaction force acting on the roller when pressed by the rubber roller.

  As a device for evaluating the rigidity of a paper sheet based on sound, a method of determining the rigidity of a paper sheet from the sound generated by the vibration caused by periodically bringing a roll into contact with the paper sheet Has been proposed (see, for example, Patent Document 1).

  As a device that evaluates the rigidity of banknotes by the reaction force of the rollers, a sensor roller that receives a reaction force against the tension of the banknotes passing through the transport path is rotatably supported at one end of the sensor lever, and the sensor lever is strained. A device has been proposed in which a gauge is attached. This is because the sensor roller is distorted when the sensor roller receives a reaction force against the tension of the banknote passing through the holding conveyance path, and this is detected by the strain gauge, and the rigidity of the banknote is measured by detecting this strain amount. (See, for example, Patent Document 2).

  In addition, as a device for measuring the integrated stiffness of paper sheets being conveyed by the reaction force of the rollers in all directions including the direction perpendicular to the paper conveyance direction and the paper conveyance direction, etc. MD paper quality measurement sensor for measuring the rigidity in the conveying direction (MD direction) with respect to the paper sheets being used, a cylindrical guide roller and a cylindrical sub guide respectively disposed before and after the MD paper quality measurement sensor An apparatus including a roller and a CD paper quality measurement sensor that measures rigidity in a direction perpendicular to the transport direction (CD direction) with respect to a transported paper sheet has been proposed (for example, see Patent Document 3). ).

  In addition, as a device that can detect the texture of paper sheets without being affected by environmental temperature and humidity, it is transmitted from the surface of the banknotes via a drive roller and a detection roller that sandwich and convey the banknotes, and the detection roller. Piezoelectric element that detects the texture of bills by measuring force, temperature sensor and humidity sensor that measures at least one of temperature and humidity in the apparatus body, and a correction value that is measured by the temperature sensor and humidity sensor As an apparatus, a CPU that corrects a detection value by adding it to a detection value detected by a piezoelectric element has been proposed (see, for example, Patent Document 4).

Special table 2001-506740 gazette WO99 / 50797 JP 2001-349824 A JP 2002-139392 A

  However, in the case of WO99 / 50797, the entire banknote is not scanned by the sensor roller, and a portion where the roller is not scanned does not enter the detection target, so that it is not suitable for authenticating the banknote. That is, as shown in FIG. 16, when the sensor roller (23) passes through the center of the banknote (bank note), there is a problem that the rigidity value of the OVD application location cannot be measured and the presence / absence of OVD application cannot be determined.

  Also, regarding JP 2001-349824, the surface of a paper sheet is scanned by a roller longer than the width of the paper sheet, and the rigidity of the entire paper sheet is detected by a sensor. A two-dimensional distribution cannot be obtained and is not suitable for authenticity determination.

  In addition, each technique obtains a rigidity value by a reaction force acting on a rubber roller when pressed against a paper sheet (banknote, etc.) with a rubber roller, and detects aging of the banknote based on the obtained rigidity value. It is used to determine whether or not redistribution is possible, and the main purpose is quality control of the paper itself. Accordingly, it is impossible to determine whether the paper sheet is forged or not.

  The present invention aims to solve the above-described problems. Specifically, a paper sheet is wound around a flexible roller, and the detection roller is scanned on the paper sheet simultaneously with the rotation of the roller. Accordingly, it is an object of the present invention to provide a method and apparatus for acquiring a rigidity detection signal, creating a two-dimensional rigidity distribution from the acquired rigidity detection signal, and determining authenticity.

  The authenticity determination method based on the two-dimensional distribution of the paper sheet according to the present invention sets the rotation speed of the driving roller and the scanning pitch of the detection roller, which are measurement conditions for measuring the paper sheet, in advance. A sheet of paper wound around the drive roller by being wound around the drive roller, rotating the drive roller based on the set rotation speed of the drive roller, and moving on the drive roller based on the set scanning pitch of the detection roller. The paper sheet is detected from the rigidity detection device attached to the support portion of the detection roller, and the rigidity detection signal of the paper sheet and the position detection signal of the paper sheet are acquired. The two-dimensional distribution of rigidity is created by adapting and arranging the two, and the two-dimensional distribution of rigidity is compared with the two-dimensional distribution of reference rigidity prepared in advance using a preset method. And performing authenticity discrimination by.

  The authenticity determination method based on the two-dimensional distribution of the paper sheet according to the present invention sets the rotation speed of the driving roller and the scanning pitch of the detection roller, which are measurement conditions for measuring the paper sheet, in advance. Wrapping around the drive roller, rotating the drive roller based on the set rotation speed of the drive roller, and based on the set detection roller scanning pitch, the detection roller and the thickness detector linked to the detection roller move over the drive roller By scanning the paper sheet wound around the drive roller, the paper sheet rigidity detection signal and the paper sheet position detection signal are obtained from the rigidity detection device attached to the support portion of the detection roller. The thickness detection signal of the paper sheet is acquired from the thickness detection device, and the stiffness detection signal and the position detection signal are matched and arranged to create a two-dimensional stiffness distribution. The thickness detection signal and the position detection signal are matched to produce a two-dimensional thickness distribution, and a predetermined two-dimensional distribution, a pre-prepared standard stiffness two-dimensional distribution, and a two-dimensional thickness distribution are prepared in advance. The authenticity determination is performed by comparing the reference thickness two-dimensional distribution.

  The authenticity determination method based on the two-dimensional distribution of the paper sheet according to the present invention sets the rotation speed of the driving roller and the scanning pitch of the detection roller, which are measurement conditions for measuring the paper sheet, in advance. Wrapping around the drive roller, rotating the drive roller based on the set rotation speed of the drive roller, and based on the set detection roller scanning pitch, the detection roller and the thickness detector linked to the detection roller move over the drive roller By scanning the paper sheet wound around the drive roller, the paper sheet rigidity detection signal and the paper sheet position detection signal are obtained from the rigidity detection device attached to the support portion of the detection roller. The thickness detection signal of the paper sheet is acquired from the thickness detection device, and the stiffness detection signal and the position detection signal are matched and arranged to create a two-dimensional stiffness distribution. The thickness detection signal and the position detection signal are matched and arranged to create a thickness two-dimensional distribution, and the composite stiffness two-dimensional distribution and thickness two-dimensional distribution are combined to create a composite two-dimensional distribution. According to the method described above, the authenticity determination is performed by comparing the composite two-dimensional distribution with the reference composite two-dimensional distribution prepared in advance.

  A paper sheet stiffness two-dimensional distribution evaluation apparatus according to the present invention includes a drive unit that rotates a paper sheet, a detection unit that detects the rigidity of the paper sheet, and an evaluation unit that evaluates the stiffness two-dimensional distribution of the paper sheet. The drive unit includes a drive roller that winds the paper sheet and a motor that controls the rotation of the drive roller, and the detection unit performs driving rotation of the drive roller via the paper sheet. In contrast, a detection roller that performs driven rotation, a rigidity detection device that detects the rigidity of the paper sheet by spirally scanning the paper sheet with the detection roller, and a rigidity detection device that scans the paper sheet It has the scanning device for doing.

  A paper sheet stiffness two-dimensional distribution evaluation apparatus according to the present invention includes a drive unit that rotates a paper sheet, a detection unit that detects the rigidity of the paper sheet, and an evaluation unit that evaluates the stiffness two-dimensional distribution of the paper sheet. The drive unit includes a drive roller that winds the paper sheet and a motor that controls the rotation of the drive roller, and the detection unit performs driving rotation of the drive roller via the paper sheet. In contrast, a detection roller that performs driven rotation, a rigidity detection device that detects the rigidity of the paper sheet by spirally scanning the paper sheet with the detection roller, and the thickness of the paper sheet in conjunction with the detection roller It has a thickness detecting device for detecting, and a scanning device for scanning the paper sheet with a rigidity detecting device and a thickness detecting device.

  The drive roller in the rigidity detection device of the present invention is characterized in that a rigid shaft is covered with a flexible material, and the detection roller is covered with a material harder than the surface material of the drive roller.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to measure and evaluate the rigid two-dimensional distribution of the flexible media of paper sheets, such as a banknote.

  Since the rigidity of each forgery prevention element such as intaglio printing, filling, OVD, etc. mounted on banknotes (banknotes) can be understood, forgery by color copy etc. by comparing with authentic data in authenticity determination processing such as appraisal Can be eliminated.

  It can also be used for quality control of rigid two-dimensional distribution at the paper sheet manufacturing site. At this time, it is possible to discriminate between correctness and loss by comparing with correct bill data.

  Since it is possible to detect the entire detection target area with a single sensor, there is no influence due to individual differences between sensors, which is a concern when a plurality of sensors are arranged to produce a rigid two-dimensional distribution.

  Since the obtained data can also be used as an index of the degree of aging of paper sheets, it can be used as a standard for paper sheet recirculation.

  In addition, by installing a sensor that can measure the height (thickness) of the medium, such as a displacement sensor, and measuring the two-dimensional thickness distribution at the same time as the rigidity value, the rigidity value relative to the thickness can be known. This makes it easy to distinguish between the two and makes it possible to perform more sophisticated authenticity determination processing.

  The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a paper sheet stiffness two-dimensional distribution evaluation apparatus according to the present invention. FIG. 2A is a diagram illustrating a positional configuration of the paper sheet and the apparatus according to the present invention, and FIG. 2B is a diagram illustrating a configuration of the positional configuration of FIG. (C) is a figure which shows sectional drawing of the dashed-dotted line part in (b). FIG. 3A is a diagram showing a configuration when a plurality of strain gauges are used in the stiffness detector in the present invention, and FIG. 3B is a diagram showing a configuration when a load sensor is used in the stiffness detector. (C) is a figure which shows the structure at the time of using a non-contact-type displacement sensor for a rigidity detection apparatus, (d) shows the structure at the time of using a contact-type displacement sensor for a rigidity detection apparatus. FIG. FIG. 4A is a diagram illustrating a positional configuration of the paper sheet and the apparatus according to the present invention, and FIG. 4B is a diagram illustrating a configuration of the positional configuration of FIG. (C) is a figure which shows sectional drawing of the dashed-dotted line part in (b). FIG. 5 is a diagram showing a stiffness two-dimensional distribution evaluation flow for authenticity determination in the present invention. FIG. 6 is a diagram showing a flow of a detection signal in the rigidity two-dimensional distribution evaluation process according to the present invention. FIG. 7 is a diagram showing a data creation process of a rigid two-dimensional distribution serving as a reference in the present invention. FIG. 8 is a diagram showing the principle of producing a rigid two-dimensional distribution in the present invention. FIG. 9 is a diagram showing an outline of a paper sheet stiffness two-dimensional distribution evaluation apparatus according to the present invention. FIG. 10A is a diagram showing the positional configuration of the paper sheet and the apparatus according to the present invention, and FIG. 10B is a diagram showing the configuration of the positional configuration of FIG. (C) is a figure which shows sectional drawing of the dashed-dotted line part in (b). FIG. 11 is a diagram showing a rigidity two-dimensional distribution evaluation flow for authenticity determination in the present invention. FIG. 12 is a diagram showing a flow of a detection signal in the stiffness two-dimensional distribution evaluation process according to the present invention. FIG. 13 is a diagram showing a principle of producing a rigid two-dimensional distribution in the present invention.

  The apparatus and method for evaluating and evaluating the two-dimensional rigidity distribution from the position detection signal and the rigidity detection signal will be described with reference to FIGS. 1 to 8, and the position detection signal, the rigidity detection signal, and the thickness will be described with reference to FIGS. An apparatus and method for evaluating a two-dimensional stiffness distribution from a detection signal will be described.

  First, an apparatus and method for evaluating by performing a two-dimensional stiffness distribution from a position detection signal and a stiffness detection signal will be described with reference to FIGS. FIG. 1 shows an outline of a paper sheet stiffness two-dimensional distribution evaluation apparatus (1). The rigidity two-dimensional distribution evaluation apparatus (1) in FIG. 1 includes a drive unit (2), a detection unit (3), and an evaluation unit (4).

  The drive unit (2) is means for rotating the paper sheet (15). The drive unit (2) has a drive motor (5) and a drive roller (6).

  The drive motor (5) is composed of a motor capable of controlling the rotation speed, such as a servo motor, and is driven to rotate at an appropriate rotation speed or torque according to input conditions.

  The drive roller (6) is composed of a rigid shaft and a flexible material, and the rigid shaft is covered with a flexible material. In addition, it is a condition that the installation area of the driving roller is not less than a size that allows the detection object (paper sheet) to be installed. Regarding the outer periphery of the drive roller, if the outer periphery is too small, it becomes difficult to fix the paper sheet. Conversely, if the outer periphery is large, it is easy to fix the paper sheet. The nip amount between (7) and the driving roller (6) becomes large, which may affect the detection accuracy. Therefore, the outer peripheral diameter of the driving roller is preferably set to an outer periphery suitable for paper sheets, in which the paper sheets can be easily wound, and further, the hardness is preferably 10 Hs or less.

  The detection unit (3) is means for detecting the rigidity of the paper sheet. The detection unit (3) includes a detection roller (7), a rigidity detection device (8), and a scanning device (10), and in the axial direction of the drive unit (2) during the rotation of the drive roller (6). The paper sheet (15) is scanned while scanning at a predetermined pitch.

  The detection roller (7) is covered with a material whose hardness is higher than the surface material of the drive roller (6), and contacts the drive roller (6) via the paper sheet (15) when measuring the rigidity value. The driven rotation is performed with respect to the driving rotation of (6). The diameter and width of the detection roller are determined by the desired detection accuracy and detection time. It is desirable to reduce the diameter and width of the detection roller so as to detect with high accuracy, and to reduce the nip amount between the drive roller (6) and the detection roller (7).

  The hardness of the detection roller (7) is desirably 50Hs or more, and in order to easily reflect the rigidity of the paper sheet, the difference between the hardness of the drive roller (6) and the hardness of the detection roller (7) is larger. desirable.

  The pressing force of the detection roller (7) to the drive roller (6) depends on the detection object (paper sheet), the hardness of the drive roller (6), and the hardness (7) of the detection roller. It may be 0 N / mm (only in contact) with no paper sheets installed, but in order to increase the detection signal component for the purpose of improving the S / N, it is more than 0 N / mm. It is desirable to press a little. Conversely, if the pressing force is too strong, there is a possibility that the difference in rigidity (reaction force) of the paper sheets cannot be detected.

  The rigidity detection device (8) is attached to the support portion of the detection roller (7). As a detection method, there are a method using a strain gauge and a load cell, and a method by measuring the vertical movement amount of the roller with a displacement sensor. is there. Moreover, the form integrated in the detection roller (7) using a piezoelectric element may be sufficient.

  When detecting and evaluating the stiffness of ordinary paper sheets, the stiffness detection device (8) can simultaneously acquire the stiffness detection signal and the position detection signal, and the timing of the position detection signal matches the stiffness detection signal. To create a two-dimensional stiffness distribution. On the other hand, when the paper sheet to be detected is very thin and the reaction force is weak, there is a possibility that a position detection signal cannot be acquired from the stiffness detector (8). In such a case, it is necessary to clarify the position of the detection start position and the detection end position of the paper sheet from the difference between the color of the paper sheet and the color of the driving roller (6) and acquire the position detection signal. As a means for acquiring the position detection signal, there is a method provided to synchronize the position detection device (9) with the rigidity detection device (8).

  The position detection device (9) scans the paper sheet (15) in synchronization with the movement of the detection roller (7), and acquires a position detection signal. The position detection device (9) can accurately specify the scanning portion of the paper sheet (15). For example, there is a method using an encoder, a photoelectric sensor, or an image sensor.

  The scanning device (10) is a device that scans the detection roller (7) and the rigidity detection device (8), operates according to the input conditions, and detects the detection roller (7) and the rigidity detection device (8) at an appropriate speed. To scan. For example, there is a scanning control system using a linear servo mechanism.

  Further, the rigidity detection signal of the paper sheet (15) is detected by the detection sheet (15) of the paper sheet (15) wound around the driving roller (6) by the detection roller (7) moving spirally on the driving roller (6). Scanning is performed by the rigidity detection device (8) attached to the support portion of the detection roller (7). However, when the paper sheet (15) is wound parallel to the rotation direction of the drive roller (6), the detection roller (7) moves spirally on the drive roller (6). The detection roller (7) is scanned in a spiral manner on the class (15). Therefore, as a method of scanning the detection roller (7) in parallel with the paper sheet, the paper sheet (15) is driven to the driving roller (in accordance with the scanning pitch of the detection roller (7) and the rotation speed of the driving roller (6). 6) The method of winding the sheet diagonally, and further, the detection roller (7) scans the sheet in parallel at the position where the sheet is wound around the drive roller (6), and the sheet is wound. There is a method of repeatedly scanning the detection roller (7) obliquely while moving the detection roller (7) obliquely to a next scanning start position where the paper sheet is scanned next, and the latter method is the most desirable method.

  The evaluation unit (4) is a means for evaluating the rigid two-dimensional distribution of paper sheets, and includes a control device (11), an operation setting device (12), a storage device (13), and an output device (14). ing.

  The storage device (13) stores programs, parameters, and the like necessary for device control and an evaluation algorithm, and further includes a two-dimensional rigidity distribution and rigidity prepared from measurement conditions, authenticity determination conditions, rigidity detection signals, and rigidity detection signals. This is a part for storing the evaluation result of the two-dimensional distribution.

  The control device (11) performs a rigid two-dimensional distribution creation process and further processes the paper sheets according to a predetermined evaluation algorithm with respect to various controls in the rigid two-dimensional distribution evaluation device (1) and signals received by the detection unit (3). It is a means for performing rigidity evaluation and authenticity determination.

  The operation setting device (12) is a part for setting the operation of the entire device, and is used for setting measurement conditions such as the rotational speed of the drive roller (6) and the scanning pitch of the detection roller (7), and further performing a discrimination process. It is a means for setting a discrimination condition.

  The output device (14) is means for outputting the two-dimensional rigidity distribution of the paper sheets obtained by the control device (11), the evaluation result, and the discrimination result.

  The rigidity two-dimensional distribution evaluation device (1) and the paper sheet (15) are in a positional relationship as shown in FIG. 2, and the paper sheet (15) is installed on the drive roller (6) as shown in FIG. 2 (a). The rotation of the driving roller (6) and the scanning of the detection roller (7) are synchronized, and the detection roller (7) moves spirally on the driving roller (6), so that the paper sheets (15 ).

  FIG.2 (b) is the figure which looked at Fig.2 (a) from the axial direction. The detection roller (7) is supported by a detection roller support portion made of a material having a relatively high rigidity, and the rigidity detection device (8) is attached to the detection roller support portion. A strain gauge (16) is used as the rigidity detection device (8), and is attached to a position where tensile strain is generated by a reaction force applied to the detection roller (7) received from the paper sheet (15).

  In addition to using the strain gauge (16) as the stiffness detector (8) only in the tensile strain direction as shown in FIG. 2, the strain gauges (16) are provided above and below the detection roller support as shown in FIG. Affixing may be performed to detect both tensile strain and compressive strain to evaluate rigidity. By doing so, the output against bending strain can be doubled. In addition to a strain gauge, a load sensor (17) such as a load cell as shown in FIG. 3B may be used to measure a load acting on the detection roller (7).

  Further, the detection roller (7) may be evaluated by measuring the position fluctuation amount of the detection roller support portion generated by the reaction force received from the paper sheet (15), as shown in FIG. 3 (c). A type displacement sensor (18) or a contact type displacement sensor (19) as shown in FIG. Further, the other methods are not limited to the methods described here as long as there is a method capable of detecting a signal reflecting the rigidity of the paper sheet.

  FIG.2 (c) is sectional drawing of the dashed-dotted part in FIG.2 (b), and is an enlarged view of the contact part of a detection roller (7) and paper sheets (15). In this manner, the amount of pressing of the detection roller (7) into the paper sheet (15) changes according to the rigidity of the paper sheet (15), and as a result, the amount of strain generated in the detection roller support portion is detected. . It is preferable that the surface of the drive roller (6) has a sufficiently small hardness and is more flexible than the detection roller (7) and the paper sheet (15).

  As the configuration of the driving roller (6), an extremely flexible material uniformly coated may be used. However, if the reaction force can be detected according to the rigidity of the object by contact with the detection roller (7), the driving roller (6) may be used. It does not matter even if it is a configuration. For example, a roller that forms a spiral groove along the traveling direction of the detection roller (7) on the surface of the drive roller (6) as shown in FIG. 4 and detects the reaction force at that location. FIG. 4A is an external view in this case, FIG. 4B is a view of the detection unit viewed from the axial direction, and FIG. 4C is a cross-sectional view of the part of the broken line in FIG. It is. In this case, during the detection area measurement, the detection roller (7) and the drive roller (6) are basically not in contact with each other, and thus are less affected by the surface material of the drive roller (6) than in the case of FIG. There is.

  Next, FIG. 5 shows the stiffness two-dimensional distribution evaluation processing flow, and FIG. 6 shows the flow of the detection signal at that time. It demonstrates according to these.

  FIG. 5 is an example of an evaluation method using the apparatus of FIG. First, measurement conditions are set before performing authenticity determination as to whether the paper sheet to be detected is a genuine ticket or a forged ticket (STEP 01). The setting items are the rotational speed of the driving roller and the scanning pitch of the detection roller (scanning speed: scanning pitch amount per one rotation of the driving roller). Since it is desirable to perform the setting determined at the start of authenticity determination, basically the parameters set at first need not be changed as long as the types of paper sheets are the same.

  Thereafter, the authenticity determination condition is set from the data based on the genuine ticket (STEP 02). This is to set a method for determining authenticity, to set authentic two-dimensional distribution of authentic standard stiffness, and to set a threshold value and an allowable value for authenticity determination.

  In addition, about the setting of a genuine bill reference | standard rigidity two-dimensional distribution, it carries out using one or more genuine bills. At this time, in order to improve the reliability and effectiveness of the genuine bill standard stiffness two-dimensional distribution, it is desirable to create the true bill standard stiffness two-dimensional distribution using a plurality of (multiple) data. There is a method as shown in FIG. Note that the order of setting the measurement conditions and setting the authenticity determination conditions may be reversed.

  After the measurement conditions and the authenticity determination conditions are set and input, the drive unit (2) and the detection unit (3) are in the rigidity value detection standby state according to the measurement conditions, and the drive roller (6) and the scanning device (10) are operated. (STEP03). At this time, the drive roller (6) and the scanning device (10) operate according to the parameters set in the measurement conditions.

  The rotation of the drive roller (6) and the scanning of the detection roller (7) are performed in synchronization, and the rigidity detection of the paper sheet is started by the strain gauge (16) attached to the support portion of the detection roller (7). (STEP04).

  This rigidity detection is repeated until the entire area of the paper sheet is scanned (STEP 05). As for the detection end timing, a threshold value is provided for the rigidity detection signal, and when the detection end timing is equal to or lower than a predetermined threshold value, it is determined that the scanning of the object is ended.

  After determining that the entire area has been detected, the drive motor (5) is stopped and scanning by the detection unit is terminated (STEP06).

  Thereafter, a rigid two-dimensional distribution of the paper sheet is produced by the production method of FIG. 8 (STEP07). Here, an explanation will be given by taking as an example a paper sheet to which a watermark (21) and a stripe type OVD (22) are applied as shown in FIG. FIG. 8B shows a portion through which the detection roller passes during each scanning. In this figure, a region surrounded by a dotted line is a position through which each scanning passes. The rigidity detection signal in each scanning line is shown in FIG. 8C, and the signal capture timing is determined by the paper sheet position detection signal obtained by position detection, and the positions of the rigidity detection signal and the paper sheet are matched. By arranging the plurality of reaction force detection data obtained in this way as shown in FIG. 8D, a rigid two-dimensional distribution of paper sheets is produced.

  Next, the stiffness two-dimensional distribution of the paper sheet is evaluated by a preset method (evaluation algorithm) based on the prepared stiffness two-dimensional distribution and a preset genuine note standard stiffness two-dimensional distribution (STEP08). This evaluation algorithm includes absolute evaluation of the two-dimensional rigidity distribution of paper sheets, relative evaluation with respect to the two-dimensional distribution of reference rigidity, and the like. There are a method using pattern matching and a correlation function, a method of calculating the similarity, and the like, but a method of weighting and evaluating a specific portion may also be used.

  Based on the evaluation result of the rigid two-dimensional distribution, authenticity determination as to whether it is a genuine ticket or a forged ticket is performed according to the authenticity determination condition set above (STEP 09). It is also possible to compare two or more detected mediums to be measured and to determine similarity.

  These results are stored (STEP 10), and output by displaying on a monitor, printing by a printer, or the like (STEP 11), thereby informing the measurer of the results.

  Next, an apparatus and method for evaluating by performing a two-dimensional rigidity distribution from a position detection signal, a rigidity detection signal, and a thickness detection signal will be described with reference to FIGS. FIG. 9 shows the production of a paper sheet stiffness two-dimensional distribution evaluation apparatus (1). The rigidity two-dimensional distribution evaluation apparatus (1) in FIG. 9 includes a drive unit (2), a detection unit (3), and an evaluation unit (4).

  The drive unit (2) is means for rotating the paper sheet (15). The drive unit (2) has a drive motor (5) and a drive roller (6).

  The drive motor (5) is composed of a motor capable of controlling the rotation speed, such as a servo motor, and is driven to rotate at an appropriate rotation speed or torque according to input conditions.

  The drive roller (6) is composed of a rigid shaft and a flexible material, and the rigid shaft is covered with a flexible material. In addition, it is a condition that the installation area of the driving roller is not less than a size that allows the detection object (paper sheet) to be installed. If the outer circumference of the drive roller is too small, it will be difficult to fix the paper sheets. Conversely, if the outer circumference is large, it will be easier to fix the paper sheets. 7) and the driving roller (6) have a large nip amount, which may affect the detection accuracy. Therefore, the outer peripheral diameter of the drive roller is preferably an outer periphery suitable for paper sheets, in which the paper sheets can be easily wound in consideration of these matters, and the hardness is preferably 10 Hs or less.

  A detection part (3) is a means to detect the rigidity and thickness of paper sheets. The detection unit (3) includes a detection roller (7), a rigidity detection device (8), a position detection device (9), a thickness detection device (20), and a scanning device (10), and a drive roller (6). During the rotation, the sheet (15) is scanned while scanning at a predetermined pitch in the axial direction of the drive unit (2).

  The detection roller (7) is covered with a material whose hardness is higher than the surface material of the drive roller (6), and contacts the drive roller (6) via the paper sheet (15) when measuring the rigidity value. The driven rotation is performed with respect to the driving rotation of (6). The diameter and width of the detection roller are determined by the desired detection accuracy and detection time. It is desirable to reduce the diameter and width of the detection roller as the need for accurate detection, and to reduce the nip amount between the drive roller (6) and the detection roller (7).

  The hardness of the detection roller (7) is desirably 50Hs or more, and in order to easily reflect the rigidity of the paper sheet, the difference between the hardness of the drive roller (6) and the hardness of the detection roller (7) is larger. desirable.

  The pressing force of the detection roller (7) to the drive roller (6) depends on the detection object (paper sheet), the hardness of the drive roller (6), and the hardness (7) of the detection roller. It may be 0 N / mm (only in contact) with no paper sheets installed, but in order to increase the detection signal component for the purpose of improving the S / N, it is more than 0 N / mm. It is desirable to press a little. Conversely, if the pressing force is too strong, there is a possibility that the difference in rigidity (reaction force) of the paper sheets cannot be detected.

  The rigidity detection device (8) is attached to the support portion of the detection roller (7). As a detection method, there are a method using a strain gauge and a load cell, and a method by measuring the vertical scanning amount of the roller with a displacement sensor. is there. Moreover, the form integrated in the detection roller (7) using a piezoelectric element may be sufficient.

  The thickness detection device (20) is a device that detects the thickness of a paper sheet. As a detection method, when the degree of contact between the driving roller and the paper sheet is high, a non-contact displacement sensor can be used to avoid deformation of the paper sheet at the time of thickness detection. However, even if the paper sheet is not completely in close contact with the driving roller, the contact pressure of the sensor contact portion to the paper sheet is sufficiently small so that the deformation of the paper sheet at the time of detection does not occur. Sensors can be used.

  When detecting and evaluating the stiffness of ordinary paper sheets, the stiffness detection device (8) can simultaneously acquire the stiffness detection signal and the position detection signal, and the timing of the position detection signal matches the stiffness detection signal. To create a two-dimensional stiffness distribution. On the other hand, when the paper sheet to be detected is very thin and the reaction force is weak, there is a possibility that a position detection signal cannot be acquired from the stiffness detector (8). In such a case, it is necessary to clarify the position of the detection start position and the detection end position of the paper sheet from the difference between the color of the paper sheet and the color of the driving roller (6) and acquire the position detection signal. As a means for acquiring the position detection signal, there is a method provided to synchronize the position detection device (9) with the rigidity detection device (8).

  The position detection device (9) scans the paper sheet (15) in synchronization with the movement of the detection roller (7), and acquires a position detection signal. The position detection device (9) can accurately specify the scanning portion of the paper sheet (15). For example, there is a method using an encoder, a photoelectric sensor, or an image sensor.

  The scanning device (10) is a device that scans the detection roller (7), the rigidity detection device (8), and the thickness detection device (20). The scanning device (10) operates according to the input conditions and is rigid with the detection roller (7) at an appropriate speed. The detection device (8) and the thickness detection device (20) are scanned. For example, there is a scanning control system using a linear servo mechanism.

  Further, the rigidity detection signal of the paper sheet (15) is detected by the detection sheet (15) of the paper sheet (15) wound around the driving roller (6) by the detection roller (7) moving spirally on the driving roller (6). Scanning is performed by the rigidity detection device (8) attached to the support portion of the detection roller (7). However, when the paper sheet (15) is wound parallel to the rotation direction of the drive roller (6), the detection roller (7) moves spirally on the drive roller (6). The detection roller (7) is scanned in a spiral manner on the class (15). Therefore, as a method of scanning the detection roller (7) in parallel with the paper sheet, the paper sheet (15) is driven to the driving roller (in accordance with the scanning pitch of the detection roller (7) and the rotation speed of the driving roller (6). 6) The method of winding the sheet diagonally, and further, the detection roller (7) scans the sheet in parallel at the position where the sheet is wound around the drive roller (6), and the sheet is wound. There is a method of repeatedly scanning the detection roller (7) obliquely while moving the detection roller (7) obliquely to a next scanning start position where the paper sheet is scanned next, and the latter method is the most desirable method.

  The evaluation unit (4) is a means for evaluating the two-dimensional distribution of rigidity and two-dimensional distribution of paper sheets, and includes a control device (11), an operation setting device (12), a storage device (13), and an output device (14). ).

  The storage device (13) stores programs, parameters, and the like necessary for device control, and evaluation algorithms, and further includes a stiffness two-dimensional distribution and thickness created from measurement conditions, authenticity determination conditions, stiffness detection signals, and stiffness detection signals. This is a part for storing the evaluation results of the detection signal, the thickness two-dimensional distribution, the rigidity two-dimensional distribution, and the thickness two-dimensional distribution produced from the thickness detection signal.

  The control device (11) performs a rigid two-dimensional distribution creation process and a two-dimensional thickness distribution according to a predetermined evaluation algorithm for various controls in the rigid two-dimensional distribution evaluation device (1) and signals taken in by the detection unit (3). It is a means for performing the manufacturing process, and further evaluating the rigidity and thickness of the paper sheet.

  The operation setting device (12) is a part for setting the operation of the entire device, and measuring conditions such as the rotational speed of the drive roller (6), the scanning pitch of the detection roller (7), the scanning pitch of the thickness detection device (20), etc. , And further, a determination condition for determining processing is set.

  The output device (14) is means for outputting the two-dimensional rigidity distribution of the paper sheets obtained by the control device (11), the evaluation result, and the discrimination result.

  The rigidity two-dimensional distribution evaluation device (1) and the paper sheet (15) have the positional relationship shown in FIG. 10, and the paper sheet (15) is connected to the drive roller (6) as shown in FIG. 10 (a). The rotation of the driving roller (6) and the scanning of the detection roller (7) and the thickness detection device (20) are synchronized, and the detection roller (7) moves spirally on the driving roller (6). This scans the paper sheet (15).

  FIG.10 (b) is the figure seen from the axial direction. The detection roller (7) is supported by a detection roller support portion made of a material having a relatively high rigidity, and the rigidity detection device (8) is attached to the detection roller support portion. A strain gauge (16) is used as the rigidity detection device (8), and is attached to a position where tensile strain is generated by a reaction force applied to the detection roller (7) received from the paper sheet (15).

  Next, FIG. 11 shows the rigidity two-dimensional distribution evaluation processing flow, and FIG. 12 shows the flow of the detection signal at that time. It demonstrates according to these.

  FIG. 11 is an example of an evaluation method using the apparatus of FIG. First, measurement conditions are set before performing authenticity determination as to whether the paper sheet to be detected is a genuine ticket or a forged ticket (STEP 12). The setting items are the rotation speed of the driving roller, the scanning pitch of the detection roller (scanning speed: the amount of scanning pitch per rotation of the driving roller), and the scanning pitch of the thickness detection device (20). Since it is desirable to perform the setting determined at the start of authenticity determination, basically the first set parameters need not be changed as long as the types of paper sheets are the same.

  Thereafter, the authenticity determination condition is set from the data based on the genuine ticket (STEP 13). The authenticity determination conditions are: setting of a method for determining authenticity, setting of a genuine ticket reference stiffness two-dimensional distribution, setting of a genuine note reference thickness two-dimensional distribution, authentic certificate reference stiffness two-dimensional distribution for authenticity determination, and authenticity The threshold value and allowable value of the ticket reference thickness two-dimensional distribution are set.

  In addition, about the setting of a genuine bill reference | standard rigidity two-dimensional distribution and a genuine bill reference thickness two-dimensional distribution, it carries out using one or more genuine bills. At this time, in order to improve the reliability and effectiveness of the genuine sheet reference stiffness two-dimensional distribution and the genuine sheet reference thickness two-dimensional distribution, the authentic sheet reference rigidity two-dimensional distribution and the authenticity are obtained using a plurality of (multiple) data. It is desirable to produce a ticket reference thickness two-dimensional distribution, for example, a method as shown in FIG. Note that the order of setting the measurement conditions and setting the authenticity determination conditions may be reversed.

  After the measurement conditions and the authenticity determination conditions are set and input, the drive unit (2) and the detection unit (3) are in the rigidity value detection standby state according to the measurement conditions, and the drive roller (6) and the scanning device unit (10). Starts to operate (STEP 14). At this time, the drive roller (6) and the scanning device (10) operate according to the parameters set in the measurement conditions.

  The rotation of the driving roller (6), the scanning of the detection roller (7), and the scanning of the thickness detection device (20) are performed in synchronization, and the paper sheet is fed by the strain gauge (16) attached to the detection roller (7) support. The rigidity detection of the sheet is started (STEP 15), and at the same time, the thickness detection of the paper sheet is started by the thickness detection device (20) provided in the vicinity of the detection roller (7) (STEP 16). The thickness detection device (20) is usually provided in the vicinity of the detection roller (7), but may be separated as long as the rigidity detection signal and the thickness detection signal can be matched in position.

  This rigidity detection and thickness detection are repeated until the entire area of the paper sheet is scanned (STEP 17). As for the detection end timing, a threshold value is provided for the rigidity detection signal or the thickness detection signal, and when the detection end timing falls below a predetermined threshold value, it is determined that the scanning of the object is ended. When the position detection sensor (9) is used as a photoelectric sensor, the end of scanning may be determined when no banknote is detected.

  After determining that the entire area has been detected, the drive motor (5) is stopped and scanning by the detection unit is terminated (STEP 18).

  Thereafter, a two-dimensional rigidity distribution of the paper sheet is produced by the production method of FIG. 13 (STEP 19). Here, an explanation will be given by taking as an example a paper sheet to which a watermark (21) and a stripe type OVD (22) are applied as shown in FIG. FIG. 13B shows a portion through which the detection roller passes during each scanning. In this figure, a region surrounded by a dotted line is a position through which each scanning passes. FIG. 13C shows the rigidity detection signal in each scanning line. Signal capture timing is determined by the paper sheet detection signal obtained by the position detection, and the positions of the rigidity detection signal and the paper sheet are matched. The plurality of reaction force detection data obtained in this way is arranged as shown in FIG. 13D to create a two-dimensional rigidity distribution of the paper sheet.

  Similarly, a two-dimensional thickness distribution of paper sheets is produced (STEP 20). FIG. 13B shows a portion through which the thickness detection sensor passes during each scanning. In this figure, a region surrounded by a dotted line is a position through which each scanning passes. FIG. 13E shows a thickness detection signal in each scanning line. A signal capture timing is determined by the paper sheet detection signal obtained by the position detection device, and the positions of the thickness detection signal and the paper sheet are matched. A plurality of thickness detection data obtained in this way is arranged as shown in FIG. 13F, thereby creating a two-dimensional thickness distribution of the paper sheet.

  Next, paper sheets are evaluated by a preset method (evaluation algorithm) using the prepared two-dimensional distribution of rigidity and two-dimensional thickness distribution (STEP 21). This evaluation algorithm includes absolute evaluation of the two-dimensional distribution of stiffness and the two-dimensional thickness distribution of paper sheets, and relative evaluation with respect to the two-dimensional distribution of reference rigidity. This includes a method using pattern matching and a correlation function, a method of calculating similarity, and the like. Alternatively, only a specific part of the paper sheet may be extracted, and the extracted part may be weighted and evaluated.

  Furthermore, as another method, a composite two-dimensional distribution is created by computing the rigid two-dimensional distribution and the thickness two-dimensional distribution of the paper sheet to be measured, and pattern matching or the like is evaluated using the prepared composite two-dimensional distribution. It is a method to do. First, a reference composite two-dimensional distribution is prepared in advance by computing and combining a reference stiffness two-dimensional distribution and a reference thickness two-dimensional distribution prepared from a genuine note. Paper sheets are evaluated by using a predetermined evaluation algorithm for the prepared reference composite two-dimensional distribution and the composite two-dimensional distribution prepared from the measurement target. This evaluation method includes absolute evaluation of the composite two-dimensional distribution of paper sheets, relative evaluation with respect to the reference composite two-dimensional distribution, and the like. This includes a method using pattern matching and a correlation function, a method of calculating similarity, and the like.

  For the evaluation result of the rigid two-dimensional distribution or the composite two-dimensional distribution, authenticity determination as to whether it is a genuine ticket or a forged ticket is performed in accordance with the authenticity determination condition set above (STEP 22). It is also possible to compare two detected media to be measured or to determine similarity. Furthermore, it is possible to comprehensively evaluate the results of the rigid two-dimensional distribution, the thickness two-dimensional distribution, and the composite two-dimensional distribution.

  These results are stored (STEP 23), and output by displaying on a monitor, printing by a printer, or the like (STEP 24), thereby informing the measurer of the results.

  First, an embodiment of the present invention will be described. This embodiment shows an example in which a bill is evaluated for authenticity by performing a two-dimensional distribution of rigidity from a position detection signal and a rigidity detection signal.

  The driving roller is made of black urethane having an outer circumference of 60 cm, a width of 20 cm, and a surface material of 5 Hs. The detection roller is made of urethane having a diameter of 8 mm, a width of 2 mm, and a hardness of 70 Hs, and is in contact with the driving roller at a pressing force of 0.1 N / mm. The measurement condition is that the rotational speed of the driving roller is 120 revolutions / minute, and the scanning speed of the detection unit by the scanning device is 4 mm / second.

  Here, as a rigidity detection sensor, the two strain gauges shown in FIG. 3 (a) are used for reasons of detection accuracy, simplicity, etc., and these two strain gauges are made of a detection roller support portion made of stainless steel. Affix on both sides. Here, a photoelectric sensor is used as the position detection sensor, and the rigidity detection timing and the detection target region are detected by detecting the bill edge using the difference in the amount of reflected light between the driving roller as a background color and the bill. Recognize

  Before authenticity determination processing, authentic reference stiffness two-dimensional distribution data is prepared using an authentic bill. A manufacturing method will be described with reference to FIGS. FIG. 14A shows a portion through which the detection roller passes during each scanning. In this figure, a region surrounded by a dotted line is a position through which each scanning passes. The rigidity detection signal in each scanning line is shown in FIG. 14B, and the signal capture timing is set by the banknote detection signal obtained by the position detection device, and the positions of the rigidity detection signal and the banknote are adapted. By arranging the plurality of reaction force detection data obtained in this way as shown in FIG. 14C, a rigid two-dimensional distribution of banknotes is produced.

  Here, authentic reference stiffness two-dimensional distribution data is set according to FIG. 7 using data obtained by the above processing for 100 genuine banknotes. After that, the authenticity determination threshold for the authenticity ticket signal, the allowable value, and the like are set as the authenticity determination reference based on the prepared true stiffness two-dimensional distribution data.

  The measurement condition and the authenticity determination condition are set and input, and the drive unit (2) and the detection unit (3) are in the rigidity value detection standby state. After the preparation is completed, the drive roller (6) and the scanning device (10) are operated according to the parameters set in the measurement conditions, and the rigidity of the paper sheet is detected by the strain gauge (16) attached to the support portion of the detection roller (7). Be started.

  This rigidity detection is repeated until the entire area of the paper sheet is scanned. The detection end timing is when the photoelectric sensor, which is a position detection sensor, stops detecting paper sheets.

  After the detection is completed, the drive motor and the detection unit stop operating. As a result, the rigidity detection signal acquisition ends. Thereafter, a rigid two-dimensional distribution of the paper sheet to be detected is produced by the production method described with reference to FIG.

  Next, rigidity evaluation is performed using the obtained two-dimensional distribution of rigidity. The stiffness evaluation method is a method using a pattern matching method, and pattern matching is performed between a genuine bill reference stiffness two-dimensional distribution and a stiffness two-dimensional distribution obtained by measurement. The result of pattern matching is subjected to authenticity determination based on similarity based on an allowable value that is one of the predetermined authenticity determination conditions.

  These comparison evaluation results and authenticity determination results are displayed on the operation monitor and stored in a storage device such as a hard disk. Also, if necessary, the output is printed by a printer, a buzzer, a patrol light, etc., and the result is notified to the operator.

  In this embodiment, an example has been shown for banknotes, but discrimination can be performed by the same processing even if the base material is a flexible medium printed material other than paper.

  Next, an embodiment of the present invention will be described. This embodiment shows an example in which the authenticity determination of the banknote to be evaluated is performed by evaluating the two-dimensional rigidity distribution from the position detection signal, the rigidity detection signal, and the thickness detection signal.

  The driving roller is made of black urethane having an outer circumference of 60 cm, a width of 20 cm, and a surface material of 5 Hs. The detection roller is made of urethane having a diameter of 8 mm, a width of 2 mm, and a hardness of 70 Hs, and is in contact with the driving roller at a pressing force of 0.1 N / mm. The measurement condition is that the rotational speed of the driving roller is 120 revolutions / minute, and the scanning speed of the detection unit by the scanning device is 4 mm / second.

  Here, as a rigidity detection sensor, a method using two strain gauges shown in FIG. 3A is used for reasons of detection accuracy, simplicity, etc., and the two strain gauges are made of stainless steel. Affix to both sides. Here, a photoelectric sensor is used as the position detection sensor, and the rigidity detection timing and the detection target region are detected by detecting the bill edge using the difference in the amount of reflected light between the driving roller as a background color and the bill. Recognize

  As a thickness detection sensor, in order to avoid the influence due to the banknote not being completely in close contact with the drive roller, here a contact type displacement sensor capable of measuring the thickness with a pressing force that does not deform the banknote The method using

  Prior to performing the authenticity determination process, the authentic reference stiffness two-dimensional distribution data and the thickness two-dimensional distribution data are prepared using the genuine banknote. A manufacturing method will be described with reference to FIGS. FIG. 15A shows a portion through which the detection roller and the thickness detection sensor pass during each scanning. In this drawing, a region surrounded by a dotted line is a position through which each scanning passes. The rigidity detection signal in each scanning line is shown in FIG. 15B, and the signal capture timing is set by the banknote detection signal obtained by the position detection device, and the positions of the rigidity detection signal and the banknote are adapted. A plurality of reaction force detection data obtained in this way is arranged as shown in FIG.

  Similarly, the thickness detection signal in each scanning line is shown in FIG. 15D, and the signal capture timing is set by the banknote detection signal obtained by the position detection device, and the positions of the thickness detection signal and the banknote are adapted. By arranging the plurality of reaction force detection data thus obtained as shown in FIG. 15E, a two-dimensional distribution of banknote thickness is produced.

  Here, the authentic reference stiffness two-dimensional distribution data and the thickness two-dimensional distribution data are set according to FIG. 7 using the data obtained by the above processing for 100 genuine banknotes. Thereafter, the authenticity determination threshold for the authenticity ticket signal, the allowable value, and the like are set as the authenticity determination reference on the basis of the produced true rigidity two-dimensional distribution data and thickness two-dimensional distribution data.

  The measurement condition and the authenticity determination condition are set and input, and the drive unit (2) and the detection unit (3) are in the rigidity value detection standby state. After the preparation is completed, the drive roller (6) and the scanning device (10) are operated according to the parameters set in the measurement conditions, and the paper is detected by the strain gauge (16) and the displacement sensor (20) attached to the support portion of the detection roller (7). Leaf rigidity detection and thickness detection are started.

  This rigidity detection and thickness detection are repeated until the entire area of the paper sheet is scanned. The detection end timing is when the photoelectric sensor, which is a position detection sensor, stops detecting paper sheets.

  After the detection is completed, the drive motor and the detection unit stop operating. Thereby, the acquisition of the rigidity detection signal and the thickness detection signal ends. Thereafter, the two-dimensional rigidity distribution and the two-dimensional thickness distribution of the paper sheets to be detected are prepared by the manufacturing method described with reference to FIG.

  Next, rigidity evaluation is performed using the obtained two-dimensional distribution of rigidity. The stiffness evaluation method is a method using a pattern matching method, and pattern matching is performed between a genuine bill reference stiffness two-dimensional distribution and a stiffness two-dimensional distribution obtained by measurement. Similarly, pattern matching is performed on the obtained two-dimensional thickness distribution. The result of pattern matching is subjected to authenticity determination based on similarity based on an allowable value that is one of the predetermined authenticity determination conditions.

  With this implementation method, it is possible to determine authenticity in consideration of the thickness component, so it is possible to grasp the difference in the material constituting the paper sheet and to easily check the presence or absence of a metal element such as OVD.

  These results are displayed on the operation monitor and stored in a storage device such as a hard disk. Also, if necessary, the output is printed by a printer, a buzzer, a patrol light, etc., and the result is notified to the operator.

  In this embodiment, an example has been shown for banknotes, but discrimination can be performed by the same processing even if the base material is a flexible medium printed material other than paper.

  In addition, when the detection target is a flexible medium that is easily changed with respect to environmental changes such as paper, a temperature / humidity correction function may be possessed in order to perform a strict evaluation. In this case, the influence of temperature and humidity can be removed by performing the stiffness correction process on the temperature and humidity measured by the temperature sensor and the humidity sensor installed inside the apparatus using a correction coefficient prepared in advance.

It is a figure which shows the outline | summary of the rigid two-dimensional distribution evaluation apparatus of paper sheets in this invention. (A) is a figure which shows the position structure of the paper sheet and apparatus in this invention, (b) is a figure which shows the structure which looked at the position structure of (a) from the axial direction of the roller, (c) is a figure which shows sectional drawing of the dashed-dotted line part in (b). (A) is a figure which shows the structure at the time of using a some strain gauge for the rigidity detection apparatus in this invention, (b) is a figure which shows the structure at the time of using a load sensor for a rigidity detection apparatus. (C) is a figure which shows the structure at the time of using a non-contact-type displacement sensor for a rigidity detection apparatus, (d) is a figure which shows the structure at the time of using a contact-type displacement sensor for a rigidity detection apparatus. is there. (A) is a figure which shows the position structure of the paper sheet and apparatus in this invention, (b) is a figure which shows the structure which looked at the position structure of (a) from the axial direction of the roller, (c) is a figure which shows sectional drawing of the dashed-dotted line part in (b). It is a figure which shows the rigidity two-dimensional distribution evaluation flow of authenticity determination in this invention. It is a figure which shows the flow of the detection signal in the case of the rigid two-dimensional distribution evaluation process in this invention. It is a figure which shows the data preparation process of the rigidity two-dimensional distribution used as the reference | standard in this invention. It is a figure which shows the preparation principle of the rigid two-dimensional distribution in this invention. It is a figure which shows the outline | summary of the rigid two-dimensional distribution evaluation apparatus of paper sheets in this invention. (A) is a figure which shows the position structure of the paper sheet and apparatus in this invention, (b) is a figure which shows the structure which looked at the position structure of (a) from the axial direction of the roller. It is a figure which shows the rigidity two-dimensional distribution evaluation flow of authenticity determination in this invention. It is a figure which shows the flow of the detection signal in the case of the rigid two-dimensional distribution evaluation process in this invention. It is a figure which shows the preparation principle of the rigid two-dimensional distribution in this invention. It is a figure which shows the preparation principle of rigid two-dimensional distribution in one Example of this invention. It is a figure which shows the preparation principle of rigid two-dimensional distribution in one Example of this invention. It is a figure which shows the scanning method in the conventional paper sheets.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stiffness two-dimensional distribution evaluation apparatus 2 Drive part 3 Detection part 4 Evaluation part 5 Drive motor 6 Drive roller 7 Detection roller 8 Rigidity detection apparatus 9 Position detection apparatus 10 Scanning apparatus 11 Control apparatus 12 Operation setting apparatus 13 Storage apparatus 14 Output apparatus 15 Paper 16 Strain gauge 17 Load sensor 18 Non-contact displacement sensor 19 Contact displacement sensor 20 Thickness displacement sensor 21 Watermark 22 Stripe type OVD
23 Sensor roller

Claims (6)

Preset the rotation speed of the drive roller and the scanning pitch of the detection roller, which are measurement conditions for measuring paper sheets,
The paper sheet is wound around the drive roller, the drive roller is rotated based on the set rotation speed of the drive roller, and the detection roller moves on the drive roller based on the set scanning pitch of the detection roller. By scanning the paper sheet wound around the drive roller, the rigidity detection signal of the paper sheet and the position of the paper sheet are detected from the rigidity detection device attached to the support portion of the detection roller. Get the detection signal,
A stiffness two-dimensional distribution is created by matching and arranging the acquired stiffness detection signal and the position detection signal, and the stiffness two-dimensional distribution and the reference stiffness two-dimensional distribution created in advance are collated by a preset method. A true / false discrimination method based on a two-dimensional stiffness distribution of a paper sheet, wherein the true / false discrimination is performed. Preset the rotation speed of the drive roller and the scanning pitch of the detection roller, which are measurement conditions for measuring paper sheets,
The paper sheet is wound around the drive roller, the drive roller is rotated based on the set rotation speed of the drive roller, and the detection roller and the detection roller are interlocked based on the set scanning pitch of the detection roller. A thickness detection device moves on the drive roller to scan the paper sheet wound around the drive roller, and from the rigidity detection device attached to the support portion of the detection roller, the paper sheet A rigidity detection signal of the paper and a position detection signal of the paper sheet, a thickness detection signal of the paper sheet is acquired from the thickness detection device,
A stiffness two-dimensional distribution is created by adapting and arranging the acquired rigidity detection signal and the position detection signal, and a thickness two-dimensional distribution is obtained by adapting the acquired thickness detection signal and the position detection signal. The authenticity determination is performed by collating the two-dimensional distribution of rigidity and the two-dimensional distribution of reference rigidity prepared in advance and the two-dimensional distribution of thickness and the two-dimensional distribution of reference thickness prepared in advance by a method prepared and set in advance. The authenticity discrimination method by the two-dimensional rigidity distribution of the paper sheet characterized by this. Preset the rotation speed of the drive roller and the scanning pitch of the detection roller, which are measurement conditions for measuring paper sheets,
The paper sheet is wound around the drive roller, the drive roller is rotated based on the set rotation speed of the drive roller, and the detection roller and the detection roller are interlocked based on the set scanning pitch of the detection roller. A thickness detection device moves on the drive roller to scan the paper sheet wound around the drive roller, and from the rigidity detection device attached to the support portion of the detection roller, the paper sheet A rigidity detection signal of the paper and a position detection signal of the paper sheet, a thickness detection signal of the paper sheet is acquired from the thickness detection device,
A two-dimensional stiffness distribution is created by adapting and arranging the acquired rigidity detection signal and the position detection signal, and two-dimensional thickness by matching and arranging the acquired thickness detection signal and the position detection signal. A composite two-dimensional distribution is prepared by combining the prepared two-dimensional distribution of rigidity and the prepared two-dimensional distribution of thickness, and the composite two-dimensional distribution and the reference composite prepared in advance by a preset method. A true / false discrimination method based on a two-dimensional stiffness distribution of paper sheets, wherein true / false discrimination is performed by comparing two-dimensional distributions. A paper sheet stiffness two-dimensional distribution evaluation apparatus includes a drive unit that rotates the paper sheet, a detection unit that detects the stiffness of the paper sheet, and an evaluation unit that evaluates the stiffness two-dimensional distribution of the paper sheet. And consists of
The drive unit includes a drive roller that winds the paper sheet, and a motor that controls the rotation of the drive roller.
The detection unit is attached to a detection roller that rotates following the driving rotation of the drive roller via the paper sheet, and a support unit of the detection roller, and the detection roller moves over the paper sheet. A paper sheet having a rigidity detecting device for detecting the rigidity of the paper sheet by scanning, and a scanning device for scanning the paper sheet with the rigidity detecting device. Stiffness two-dimensional distribution evaluation device. A paper sheet stiffness two-dimensional distribution evaluation apparatus includes a drive unit that rotates the paper sheet, a detection unit that detects the stiffness of the paper sheet, and an evaluation unit that evaluates the stiffness two-dimensional distribution of the paper sheet. And consists of
The drive unit includes a drive roller that winds the paper sheet, and a motor that controls the rotation of the drive roller.
The detection unit is attached to a detection roller that rotates following the driving rotation of the drive roller via the paper sheet, and a support unit of the detection roller, and the detection roller moves over the paper sheet. A stiffness detector that detects the stiffness of the paper sheet by scanning; a thickness detector that detects the thickness of the paper sheet in conjunction with the detection roller; and the stiffness detector on the paper sheet; A paper sheet stiffness two-dimensional distribution evaluation apparatus comprising a scanning device for scanning by the thickness detection device. 5. The two-dimensional rigidity according to claim 4, wherein the driving roller has a rigid shaft covered with a flexible material, and the detection roller is covered with a material having a hardness higher than a surface material of the driving roller. Distribution evaluation device.

Images