JP4296311B2 - Anti-counterfeit paper, authenticity determination method and authenticity determination device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to printing paper used for banknotes, various securities, stock certificates, pass tickets such as tickets and commuter passes, coupon tickets for toll roads, various tickets, other securities, etc. Security that allows third parties to discern that magnetism has been applied by visual inspection, and to detect the optical and magnetic characteristics of the transparent part by using an arbitrary detection device, and to determine the authenticity The present invention relates to an anti-counterfeit paper excellent in security, a security document using the anti-counterfeit paper, and an authenticity determination method and an authenticity determination device thereof.
[0002]
[Prior art]
Since banknotes, stock certificates, or other securities have a monetary value, it is necessary to prevent counterfeiting and tampering, and various means have been used for that purpose. For example, in the case of banknotes, techniques such as making printing complicated or placing a watermark on the paper itself are adopted. However, what discriminates between authenticity visually or optically has a drawback that a forger can infer the location and method of determination. Therefore, in recent years, as a means for determining authenticity, a method of mechanically determining by printing functional ink that transmits an electrical or magnetic signal, a printed material and a substrate used for the method, and the like have been proposed. ing.
[0003]
In particular, as a method using a magnetic signal, a specific magnetic pattern such as a barcode is formed with magnetic ink to improve its security. This magnetic pattern is usually applied by printing such as screen printing. Recently, in order to further improve its security, a magnetic concealment layer is formed on the magnetic pattern so that the magnetic pattern cannot be visually recognized. It has come to be done. As an example thereof, Japanese Patent Laid-Open No. 5-208576 proposes a magnetic medium comprising a magnetic pattern layer formed on a support and a colored hiding layer for hiding the magnetic pattern layer.
[0004]
Further, JP-A-1-269227, JP-A-2-98498, and JP-A-3-252901 use it for authenticity determination by forming patterns having different magnetic characteristics at predetermined positions of a magnetic pattern. Proposals are shown.
[0005]
Furthermore, JP-A-7-61179 also proposes a magnetic medium that is made invisible by combining a magnetic pattern with a difference in magnetic characteristics and reflectance in the infrared region and forming a dummy pattern of the magnetic pattern. Has been.
[0006]
[Problems to be solved by the present invention]
Thus, in the conventional security document using magnetism, since the magnetic pattern layer is easily recognized by a third party, it is necessary to provide a concealing layer in the magnetic pattern layer in order to further improve the security. There is a problem in terms of the limitation of the method of applying the magnetic pattern or the manufacturing cost.
[0007]
That is, the predetermined magnetic pattern formed on these supports such as paper has a magnetic material used of γ-Fe ₂ O ₃ , Fe ₃ O ₄ , Co-containing iron oxide, CrO ₂ Metal powder, Ba ferrite, etc. are listed as representative examples, but these have strong absorption in the visible light range, and the magnetic pattern itself is black or gray, so that a forger can easily determine the place and method There was a drawback that could be guessed. Therefore, by using a generally available magnetic material, magnetic properties similar to those of the real material can be imparted, and the effect is small as forgery prevention.
[0008]
On the other hand, even if a colored concealment layer or a dummy pattern that conceals the formed magnetic pattern is provided, the forger can roughly estimate the place where the magnetic pattern is concealed, If the means for forming the magnetic pattern on the support and the process of camouflaging the magnetic pattern are complicated and complicated, the manufacturing cost increases correspondingly, and even a high security system may not be practical. Therefore, it is important that it is simple and low cost.
[0009]
In addition, in order to perform authenticity determination by machine reading using magnetic characteristics, it is necessary to reduce the relative ratio of external noise in order to improve the S / N ratio of the signal. Therefore, in order to give sufficient magnetic strength to the magnetic pattern formed on the support, it is necessary to form a relatively thick pattern, and there are limitations on the method for applying the magnetic pattern.
[0010]
Furthermore, in the conventional security document using both the magnetic property and the watermark, in order to use the optical effect of the watermark, it is inevitably impossible to add the magnetic property to the watermark portion. In order to discriminate authenticity by mechanical processing, it is necessary to equip the discriminating device with a magnetic detecting portion and two types of detecting devices for detecting watermark optical information at different positions. Alternatively, the volume has inevitably increased depending on the distance between the watermark portion on the security document and the magnetized portion.
[0011]
The object of the present invention is to eliminate the above-mentioned conventional drawbacks. That is, the conventional magnetic pattern is a method of applying on a paper base material by printing or the like, but in the present invention, in the process of making paper, the colored magnetic powder is used as a whole pulp slurry containing pulp, color material, etc. A paper which is blended into at least a part of the paper and has a meaningful information watermark pattern applied to a portion where the colored magnetic powder is mixed at the time of the wet paper state of the paper. Correspondingly, a meaningful information magnetic pattern and unique magnetic characteristics can be imparted.
[0012]
In addition, it is possible to obtain a magnetic force comparable to a magnetic pattern applied by a conventional printing method or the like with a relatively low blending ratio of magnetic powder. Furthermore, in the present invention, since the colored magnetic powder showing colors other than black and black-gray is used, the colored magnetic powder exhibits invisibility to the paper, and a third party cannot specify the magnetized portion. The object is to provide a sheet having a high anti-counterfeit effect.
[0013]
Further, the forgery-preventing paper of the present invention can be used as a security document that can determine authenticity by visually detecting the authenticity of a watermark portion, and further by mechanically detecting optical characteristics and magnetic characteristics. That is, the anti-counterfeit paper of the present invention is a forgery-preventing and anti-counterfeit paper that has high security, has a relatively simple manufacturing process, and is difficult for a third party to decipher the structure of the anti-counterfeit magnetic pattern. In addition, another object is to provide a method for determining the authenticity.
[0014]
Further, according to the security document using the magnetic and watermark of the present invention, it is possible to provide a security element having both the optical effect and magnetic property of the watermark, which has been difficult in the past. In order to discriminate authenticity by processing, the discriminating device can be provided with a part for detecting magnetism and two kinds of detecting devices for detecting the optical information of the watermark in one place. Can be made relatively compact.
[0015]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and the colored magnetic powder is predetermined at least partially in a pulp slurry state in a manufacturing process of a printing substrate for security documents such as banknotes, that is, paper. It has a meaningful information magnetic pattern and unique magnetic properties that are made by applying a transparent pattern to the part where the colored magnetic powder is blended at the time of the wet paper state. Anti-counterfeit paper, characterized in that the anti-counterfeit paper exhibits a color other than black and black-gray, and that a third party can visually recognize that the watermark is magnetic. Making it impossible.
[0016]
Furthermore, by comparing the meaningful information magnetic pattern and the unique magnetic characteristics given to the anti-counterfeit paper with the specific light transmittance or reflectivity of the transparent part of the anti-counterfeit paper, the security can be further improved. This is an improved anti-counterfeit paper, which relates to a method of using these meaningful information magnetic patterns, unique magnetic characteristics and optical characteristics as a means for determining authenticity, and will be described in detail below.
[0017]
A colored magnetic powder exhibiting a color other than black and black gray is uniformly dispersed in a pulp slurry and mixed in a paper manufacturing process, and at the time of a wet paper state in the paper manufacturing process, a meaningful information watermark pattern The colored magnetic powder exhibits invisibility with respect to the color exhibited by the paper, and is used for authenticity determination according to the shape of the meaningful information watermark pattern applied to the paper. An anti-counterfeit paper characterized by having a unique magnetic information pattern and magnetic properties that can be used.
[0018]
In the paper manufacturing process, the colored magnetic powder exhibiting a color other than black and black gray is uniformly dispersed and mixed in at least a part of the pulp slurry, and at the time of the wet paper state in the paper manufacturing process, A paper in which a meaningful information watermark pattern is applied to a portion in which the magnetic powder is uniformly dispersed, and the colored magnetic powder exhibits invisibility to the color exhibited by the paper. The color difference between the portion where the magnetic powder is mixed and the portion where the colored magnetic powder is not mixed cannot be visually recognized, and the portion where the colored magnetic powder is mixed in at least a portion of the paper The anti-counterfeit paper is characterized by having a unique magnetic information pattern and magnetic characteristics that can be used for authenticity determination corresponding to the shape of the meaningful information watermark pattern applied to the.
[0019]
The colored magnetic powder exhibiting colors other than black and black-gray are mixed and uniformly dispersed in the paper manufacturing process with different blending concentrations of the colored magnetic powder in each part of the pulp slurry. At the time of the wet paper state during the paper manufacturing process, at least one portion among the portions having different blending concentrations of the colored magnetic powder is a paper having a meaningful information watermark pattern applied thereto. The colored magnetic powder exhibits invisibility with respect to the color of the paper, so that the color difference between the respective portions where the colored magnetic powder is mixed at different blending concentrations is visually observed. And at least one of the portions of the paper having different blending concentrations of the colored magnetic powder. Is anti-falsification paper which is characterized by having a magnetic information pattern and magnetic properties specific shapes available to authenticity discrimination corresponding information watermark pattern.
[0020]
The anti-counterfeit paper is characterized in that the meaningful information watermark pattern is white-squeezed with a paper thickness thinner than the surrounding area.
[0021]
The anti-counterfeit paper is characterized in that the meaningful information watermark pattern is black-squeezed with a thick paper from the periphery.
[0022]
The anti-counterfeit paper is characterized in that, as the shape of the meaningful information watermark pattern, a white squeeze with a paper thickness thinner than the surroundings and a black squeeze with a paper thickness thicker than the surroundings are simultaneously applied. is there.
[0023]
The anti-counterfeit paper is a anti-counterfeit paper characterized by exhibiting colors other than black and black-gray.
[0024]
The anti-counterfeiting paper is characterized in that the optical characteristics of the anti-counterfeit paper are 30% or more in the visible light region in the region of 380 nm to 480 nm and 40% or more in the region of 480 nm to 780 nm. .
[0025]
A forgery-preventing paper, wherein the colored magnetic powder is obtained by coating the surface of a nuclear magnetic powder exhibiting an achromatic color, a chromatic color, or a metallic luster with an organic material or an inorganic material.
[0026]
The anti-counterfeit paper is characterized in that the colored magnetic powder is obtained by coating the surface of a nuclear magnetic powder showing black and black gray with an organic material or an inorganic material.
[0027]
The colored magnetic powder is anti-counterfeit paper characterized in that the relative spectral reflectance with respect to the nuclear magnetic powder is 1.5 times or more at 380 nm to 480 nm and 2 times or more at 480 nm to 780 nm.
[0028]
The anti-counterfeit paper is characterized in that the blending ratio of the colored magnetic powder in the pulp slurry is 0.01 to 10% by weight in absolute dry pulp ratio.
[0029]
The colored magnetic powder has a particle size of 0.1 to 10 μm and a specific gravity of 1 to 10 g / cm. ³ It is a forgery prevention paper characterized by being.
[0030]
A method for determining the authenticity of the anti-counterfeit paper, wherein a unique magnetic information pattern and magnetic characteristics derived from the non-visible colored magnetic powder and meaningful information transparent pattern blended in the paper are detected. Thus, the authenticity determination method for forgery prevention paper is characterized by determining authenticity.
[0031]
In the authenticity determination method, the unique magnetic information pattern and magnetic characteristics of the meaningful information transparent pattern applied on the anti-counterfeit paper, and the optical reflection of the unique visible light region of the anti-counterfeit paper A method for determining the authenticity of anti-counterfeit paper, wherein the authenticity is determined by combining at least one of rate, absorption, and transmittance.
[0032]
The intrinsic magnetic characteristics are coercive force, residual magnetization, magnetic permeability, maximum magnetic permeability, differential value of magnetic permeability, magnetic moment and magnetic flux change, and at least one of these intrinsic magnetic characteristics should be used. This is a feature of a forgery prevention paper authenticity discrimination method.
[0033]
A method for determining the authenticity of forgery-preventing paper, characterized in that a magnetic head using a DC bias, a magnetic head using an AC bias, or a magnetic sensor using a magnetoresistive element is used as means for detecting the inherent magnetic characteristics.
[0034]
An anti-counterfeit paper authenticity discrimination device for detecting a unique magnetic information pattern and magnetic characteristics derived from the non-visible colored magnetic powder and meaningful information transparent pattern blended in the anti-counterfeit paper In order to achieve this, the magnetic sensor is brought into contact with or close to the anti-counterfeit paper, and the unique magnetic information pattern derived from the non-visible colored magnetic powder and meaningful information transparent pattern blended in the anti-counterfeit paper And magnetic characteristics are detected, compared with the true magnetic information stored in advance, and the unique magnetic information pattern and magnetism derived from the colored magnetic powder and meaningful information transparent pattern of the anti-counterfeit paper An anti-counterfeit paper authenticity judgment device comprising a judgment circuit that judges that only when characteristics and true magnetic information stored in advance coincide with each other A.
[0035]
An anti-counterfeit paper authenticity discrimination device for detecting a unique magnetic information pattern and magnetic characteristics derived from the non-visible colored magnetic powder and meaningful information transparent pattern blended in the anti-counterfeit paper In order to achieve this, the magnetic sensor is brought into contact with or close to the anti-counterfeit paper, and the unique magnetic information pattern derived from the non-visible colored magnetic powder and meaningful information transparent pattern blended in the anti-counterfeit paper In addition, the magnetic characteristics are detected and compared with true magnetic information stored in advance, and the electrical signal obtained by using the photoelectric conversion element is amplified through an amplifier for the color exhibited by the anti-counterfeit paper. The voltage value obtained in this way is compared with the true voltage value stored in advance, and the colored magnetic powder and the meaningful information transparent pattern that the anti-counterfeit paper has The inherent magnetic information pattern and magnetic characteristics that come and the true magnetic information stored in advance match, and the voltage value obtained from the color exhibited by the anti-counterfeit paper and the true voltage value stored in advance A forgery prevention sheet authenticity determination device characterized in that a determination circuit is configured to determine authenticity only when the two match.
[0036]
Forgery characterized by using at least one of coercive force, residual magnetization, magnetic permeability, maximum magnetic permeability, differential value of magnetic permeability, magnetic moment, and magnetic flux change as the inherent magnetic information pattern and magnetic characteristics to be detected. It is an authenticity discrimination device for prevention paper.
[0037]
An anti-counterfeit paper authenticity determination device using a magnetic sensor using a DC bias, a magnetic sensor using an AC bias, or a magnetic sensor using a magnetoresistive element as a method for detecting the unique magnetic information pattern and magnetic characteristics. is there.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
That is, the anti-counterfeit paper according to the present invention is obtained by mixing an arbitrary amount of colored magnetic powder with an absolute dry pulp ratio in the paper making process in order to impart invisible magnetic properties to at least a part of the final paper product. The anti-counterfeit paper having an arbitrary magnetic pattern corresponding to the paper material uneven shape of the watermark portion by applying a watermark of an arbitrary pattern to the magnetism imparted portion of the colored paper exhibiting a color tone other than black and black gray.
[0039]
That is, it is impossible to visually recognize that the watermark portion has a magnetic characteristic, and the magnetic pattern of the obtained anti-counterfeit paper is a machine such as a magnetic sensor. It is characterized in that it is used as one means of a security document authenticity determination method using the forgery prevention paper by detecting by a typical method.
[0040]
Further, the detection of the magnetic pattern of the anti-counterfeit paper and the light transmittance or reflectivity of an arbitrary portion of the anti-counterfeit paper is performed by comparing these two detection signals, thereby performing authenticity determination. It is characterized by that.
[0041]
Anti-counterfeiting paper as used in the present invention refers to banknotes, stock certificates, gift certificates, check / bills paper and other securities, important documents, prepaid cards, credit cards, boarding passes for various means of transportation, pass tickets, coupon tickets, Documents or cards that have a monetary value such as a passport or identification card, or an important purpose document or card that proves or guarantees an identity, such as paper or paper Is the main constituent.
[0042]
The pulp used for producing the anti-counterfeit paper of the present invention is not particularly limited as long as it is a pulp used for ordinary printing paper, information recording paper and the like. Chemical pulp (NBKP, LBKP, etc.), mechanical pulp (GP, CGP, RGP, TMP, etc.), deinked waste paper pulp (DIP), wood pulp, and non-wood pulp may be mixed and blended. It may be. Moreover, a synthetic fiber, an inorganic fiber, etc. may be mixed as needed.
[0043]
Furthermore, the anti-counterfeit paper of the present invention may contain various additives in addition to the various pulps, synthetic fibers, and inorganic fibers depending on the application.
[0044]
Further, the anti-counterfeit paper of the present invention is a single-layer or multiple-layer paper made of the above material, and a synthetic resin may be laminated on the surface or between the paper layers. Furthermore, printing may be performed as necessary, or one or both sides may be information recording paper such as thermal recording, thermal transfer recording, electrostatic recording, magnetic recording, or the like.
[0045]
The magnetic powder used in the present invention is γ-Fe ₂ O ₃ , Fe ₃ O ₄ , Co-containing iron oxide, CrO ₂ Coating the above magnetic material with an arbitrary material by applying surface treatment such as vapor deposition, sputtering, sol-gel method, coating method, plating method, etc., with a magnetic material such as iron, metal powder, and Ba ferrite as the core The material is not particularly limited as long as it is a material exhibiting a predetermined chromatic color or achromatic color other than black and black gray.
[0046]
Example 1
In LBKP pulp slurry, 2.5% of light brown magnetic powder is blended with 100% by weight of LBKP pulp, and any color material such as Permanent Carmine FB and Dainippon Ink Chemical Co., Ltd. A small amount of Pigment Yellow G made by hand, and with a hand-pulling method, a rice paper weight of about 85 g / m in this example of wet paper with a moisture content of about 63% ² The base paper of anti-counterfeiting paper was prepared. However, the light brown magnetic powder is a black spherical iron powder having a magnetic particle diameter of about 1 μm and SiO 2. ₂ , TiO ₂ Etc., the relative spectral reflectance for the spherical iron powder having a particle diameter of about 1 μm, which is black, is 1.5 to 2 times from 380 nm to 480 nm, and 2 to 2.5 times from 480 nm to 780 nm. The color of the base paper exhibited a color similar to the light cream colored paper used for general securities.
[0047]
Next, on the base paper of the anti-counterfeit paper in the present wet-paper-like embodiment, five line patterns (1 mm, line width 0.3 mm, line width 4 mm as shown in FIG. 1 (1 ).
[0048]
Further, the base paper of the anti-counterfeit paper was heat-dried and then subjected to a calendering process to produce the anti-counterfeit paper (2) in this example.
[0049]
FIG. 2 is a result of actually measuring the AA ′ cross-sectional shape (3) shown in FIG. 1 before calendering the anti-counterfeit paper (2) obtained in this example with a surface roughness tester. is there. Further, FIG. 3 shows the measured magnetic moment value (4) when the surface of the anti-counterfeit paper (2) obtained by this embodiment is swept 30 mm by a contact type magnetic detection head.
[0050]
It is confirmed that the magnetic moment measurement value changes corresponding to the uneven shape of the stock of the transparent portion of the anti-counterfeit paper (2). In this measured magnetic moment value, the shape (5) of the detection signal after conversion obtained by setting the relative value 30 or more to the electrical signal ON and setting the relative value 30 or less to the electrical signal OFF is shown in FIG.
[0051]
In other words, the security document produced using the anti-counterfeit paper (2) can be mechanically detected by a device equipped with a detection head that detects the magnetic property of the watermark. If the shape (5) of the detection signal is collated as the signal shape for authenticity determination, the authenticity determination of the security document can be performed. Further, even if the watermark portion recognizes that a watermark pattern has been given to a third party, it does not recognize that the magnetic property is imparted to this portion.
[0052]
In addition, the security document produced using the anti-counterfeit paper (2), the spectral reflectance or transmittance at a predetermined portion of the watermark portion is set in advance as the authenticity determination element, and this data and the magnetic characteristics are set. By comparing the two, the security effect is further improved.
[0053]
However, the preliminary authenticity determination elements such as the spectral reflectance and transmittance at a predetermined location of the watermark portion are not limited to the spectral reflectance and transmittance described here.
[0054]
FIG. 5 shows a schematic block diagram of a true / false discrimination apparatus having a magnetic head for detecting a magnetic moment. That is, this device has a structure in which the magnetic head (7) is in contact with the watermark portion of the anti-counterfeit paper (2) by inserting the anti-counterfeit paper (2) into the device by the paper transport motor (6). It detects the unique magnetic information pattern and magnetic properties derived from the non-visible light brown magnetic powder and meaningful information transparent pattern blended in the paper, and is blended in the paper. After converting the unique magnetic information pattern and magnetic characteristics derived from the non-visible light brown magnetic powder and meaningful information transparent pattern into an electric signal, the electric signal is amplified by an amplifier (8), Compared with the stored true magnetic information (Vrefm), and detected the color exhibited by the transparent part of the anti-counterfeit paper using the photoelectric conversion element (9), and obtained electrical signal Through the amplifier (10) The voltage value obtained in this way is compared with the true voltage value (Vrefc) stored in advance, and in the determination circuit (11), blended with the paper that the anti-counterfeit paper (2) has The unique magnetic information pattern and magnetic characteristics derived from the non-visible light brown magnetic powder and meaningful information transparent pattern match the prestored true magnetic information (Vrefm) and prevent forgery. A circuit that judges only when the voltage value obtained from the color presented by the clear section of the paper and the true voltage value (Vrefc) stored in advance match, and is judged as authentic by the CPU (12). If the judgment display unit (13) displays an OK display and if it is determined to be fake, the determination display unit (13) displays an NG display and the paper transport motor (6) It is configured to discharge to
[0055]
(Example 2)
In the LBKP pulp slurry, as shown in FIG. 6, square cylinders (15) each having a side of 40 mm in the pulp slurry (14) are spaced a few millimeters upward from the surface of the handsheet sheet machine net (16). The inside of the square tube (15) is mixed with 2.5% of the light brown magnetic powder used in Example 1 in an external ratio with respect to the absolute dry pulp amount, and an arbitrary color material, for example, In addition, a small amount of permanent carmine FB manufactured by Nippon Pigment Co., Ltd. and Pigment Yellow G manufactured by Dainippon Ink Chemical Co., Ltd. are uniformly dispersed. A small amount of Carmine FB and Pigment Yellow G manufactured by Dainippon Ink & Chemicals, Inc. are uniformly dispersed, and by hand-drawing method, a rice paper basis weight of about 85 g / m in this example of wet paper with a moisture content of about 63% ² The base paper of anti-counterfeiting paper was prepared. The color of the base paper exhibited a color similar to the light cream colored paper used for general securities.
[0056]
Next, a portion (17) in which the light brown magnetic powder is mixed with the base paper of the anti-counterfeit paper in the present embodiment in the form of the wet paper as shown in FIG. A five-line pattern (18) with a width of 0.3 mm and a line pitch of 4 mm was provided.
[0057]
Further, the base paper of the anti-counterfeit paper according to the present invention was heat-dried and then calendered to produce the anti-counterfeit paper (19) according to the present invention.
[0058]
FIG. 8 shows the spectral reflectance curves (21) and (22) in the visible light region of the light brown magnetic powder application portion (17) and the non-application portion (20) of the anti-counterfeit paper (19). showed that. The spectral reflectance in the visible light region of the light brown magnetic powder-applied part (17) and the unapplied part (20) shows the same level, and the color difference ΔE is 0.5 or less. It is impossible to distinguish between the brown magnetic powder application part (17) and the non-application part (20).
[0059]
FIG. 9 is a result of actually measuring the cross-sectional shape (23) of BB ′ shown in FIG. 7 before calendering the anti-counterfeit paper (19) obtained in this example with a surface roughness tester. It is. Further, FIG. 10 shows a measured magnetic moment value (24) when the surface of the anti-counterfeit paper (19) obtained in this example is swept 30 mm by a contact type magnetic detection head.
[0060]
It is confirmed that the magnetic moment measurement value changes corresponding to the material uneven shape of the transparent portion of the forgery prevention paper (19). In this measured magnetic moment value, the shape (25) of the detection signal after conversion obtained by setting the relative value 30 or more to the electrical signal ON and the relative value 30 or less to the electrical signal OFF is shown in FIG.
[0061]
In other words, the security document produced using the anti-counterfeit paper (19) can be mechanically detected by a device equipped with a detection head that detects the magnetic property of the watermark. If the shape (25) of the detection signal is used as a signal shape for authenticity determination and collated, the authenticity determination of the security document can be performed. Further, even if the watermark portion recognizes that a watermark pattern has been given to a third party, it does not recognize that the magnetic property is imparted to this portion.
[0062]
In addition, the security document produced using the anti-counterfeit paper (19), the spectral reflectance or transmittance at a predetermined portion of the watermark portion is set in advance as the authenticity determination element, and this data and the magnetic characteristics are set. By verifying, the further security effect is improved.
[0063]
However, the preliminary authenticity determination elements such as the spectral reflectance and transmittance at a predetermined location of the watermark portion are not limited to the spectral reflectance and transmittance described here.
[0064]
That is, by applying the authenticity determination device in the first embodiment shown in FIG. 5, the magnetic and optical characteristics of the anti-counterfeit paper (19) are detected and collated as in the first embodiment. Finally, authenticity determination can be performed.
[0065]
【The invention's effect】
In the past, in order to magnetically determine the authenticity of a security document, it was necessary to form a thick arbitrary pattern on the paper base material with dark dark magnetic ink. However, during the paper making process, the white or light brown magnetic material obtained by coating the surface of the magnetic powder exhibiting black and black gray with inherent magnetic properties according to the present invention with an arbitrary material is used. By distributing and mixing the paper, and applying a transparent pattern to the paper part having this magnetic property, the anti-counterfeit paper can be subjected to any true / false discrimination according to the thickness of the paper of the transparent part. A signal can be applied.
[0066]
That is, it is impossible for a third party to recognize the presence of the magnetic pattern at a glance without providing another concealing layer on the magnetic pattern or adding a dummy pattern. In addition, since the colored magnetic powder is uniformly dispersed and mixed during the paper making process of the base paper, it is sufficient for machine reading even in a small amount depending on the uneven shape of the material in the transparent part. Therefore, it is not necessary to form a thick magnetic pattern with black or dark magnetic ink.
[0067]
Furthermore, in the anti-counterfeit paper obtained by dispersing and mixing during the paper base paper making process, the amount of the colored magnetic powder in the paper is small, so the influence on the physical strength of the paper base material is small. There is little need to add a paper strength enhancer or the like, and there is no need to worry about the strength of the security document when it is distributed.
[0068]
In addition, for a security document created using the forgery prevention paper, the spectral reflectance or transmittance at a predetermined portion of the watermark portion is set in advance as an authenticity determination element, and this data is compared with the magnetic characteristics. This further improves the security effect.
[Brief description of the drawings]
FIG. 1 shows a forgery prevention sheet according to a first embodiment.
FIG. 2 shows a surface shape of a watermark portion AA ′ of the forgery prevention paper according to the first embodiment.
FIG. 3 shows magnetic moment measurement values of the watermark portion of the forgery-preventing paper according to Example 1;
FIG. 4 shows a detection signal after conversion of the watermark portion of the anti-counterfeit paper according to the first embodiment.
FIG. 5 is a schematic block diagram of an authenticity determination device for anti-counterfeit paper according to an embodiment of the present invention.
6 shows a manufacturing process diagram of a forgery-preventing paper of Example 2. FIG.
7 shows a forgery prevention sheet according to Embodiment 2. FIG.
8 shows respective spectral reflectance curves in a visible light region of a magnetic powder application portion and a non-application portion of an anti-counterfeit paper according to Example 2. FIG.
FIG. 9 shows a surface shape of a watermark portion BB ′ of the forgery prevention paper according to the second embodiment.
FIG. 10 shows measured values of the magnetic moment of the watermark portion of the anti-counterfeit paper according to the second embodiment.
FIG. 11 shows a detection signal after conversion of the watermark portion of the anti-counterfeit paper according to the second embodiment.
[Explanation of symbols]
1 Watermark pattern in Example 1
2 Anti-counterfeit paper in Example 1
3 Surface shape of watermark part AA 'of anti-counterfeit paper according to Example 1
4 Magnetic moment measurement value of watermark part of anti-counterfeit paper according to Example 1
5 Detection signal after conversion of watermark portion of anti-counterfeit paper according to embodiment 1
6. Motor for conveyance of authenticity discrimination device
7 Magnetic head of authenticity discrimination device
8 Authenticity amplifier
9 Photoelectric conversion element of authenticity discrimination device
10 Authenticity amplifier
11. Judgment circuit of authenticity discrimination device
12 CPU of authenticity discrimination device
13 Judgment display section of authenticity discrimination device
14 Pulp slurry in Example 2
15 A square tube with a side of 40mm
16 Mesh for hand sheeting machine
17 Portion where light brown magnetic powder is mixed on anti-counterfeit paper according to Example 2
18 Watermark pattern in Example 2
19 Anti-counterfeit paper according to Example 2
20 Portion where the light brown magnetic powder on the anti-counterfeit paper in Example 2 is not mixed
21 Spectral reflectance curve in the visible light region of the portion where the light brown magnetic powder on the anti-counterfeit paper in Example 2 is mixed
22 Spectral reflectance curve in the visible light region of the portion where the light brown magnetic powder on the anti-counterfeit paper in Example 2 is not mixed
23 Surface shape of watermark part BB 'of forgery-preventing paper according to Example 2
24 Magnetic moment measurement value of watermark portion of anti-counterfeit paper according to Example 2
25 Detection signal after conversion of watermark portion of anti-counterfeit paper according to embodiment 2
A Surface shape measurement start point of watermark portion of anti-counterfeit paper according to Example 1
A 'Surface shape measurement end point of watermark part of anti-counterfeit paper according to Example 1
B Surface shape measurement start point of watermark part of anti-counterfeit paper according to Example 2
B 'Surface shape measurement end point of watermark portion of anti-counterfeit paper according to Example 2
Vrefm True magnetic information stored in advance
Vrefc True voltage value stored in advance

Claims (14)

Coating the surface of nuclear magnetic powder showing achromatic, chromatic or metallic luster with organic or inorganic materials, or coating the surface of nuclear magnetic powder showing black and black gray with organic or inorganic materials in a particle size of at 0.1 to 10 [mu] m, and a specific gravity of 1 to 10 g / cm ^3, the colored magnetic powder exhibiting a color other than black and black gray, in the paper production process, uniformly to the pulp slurry In a wet paper state during the paper manufacturing process, the paper is provided with a meaningful information watermark pattern, and the colored magnetic powder is invisible to the color exhibited by the paper. Forgery prevention characterized by having a unique magnetic information pattern and magnetic characteristics that can be used for authenticity determination corresponding to the shape of a meaningful information watermark pattern applied to the paper Paper. Coating the surface of nuclear magnetic powder showing achromatic, chromatic or metallic luster with organic or inorganic materials, or coating the surface of nuclear magnetic powder showing black and black gray with organic or inorganic materials in a particle size of at 0.1 to 10 [mu] m, and a specific gravity of 1 to 10 g / cm ^3, the colored magnetic powder exhibiting a color other than black and black gray, in the paper manufacturing process, at least a portion of the pulp slurry And a paper with a meaningful information watermark pattern applied to the portion where the colored magnetic powder is uniformly dispersed at the time of the wet paper state during the paper manufacturing process. A portion where the colored magnetic powder is mixed and a portion where the colored magnetic powder is not mixed because the colored magnetic powder exhibits invisibility to the color of the paper. The difference in color of the paper cannot be recognized visually, and is used for authenticity determination corresponding to the shape of the meaningful information watermark pattern applied to the portion where the colored magnetic powder is mixed in at least a part of the paper. Anti-counterfeit paper characterized by having a unique magnetic information pattern and magnetic properties. Coating the surface of nuclear magnetic powder showing achromatic, chromatic or metallic luster with organic or inorganic materials, or coating the surface of nuclear magnetic powder showing black and black gray with organic or inorganic materials in a particle size of at 0.1 to 10 [mu] m, and a specific gravity of 1 to 10 g / cm ^3, the colored magnetic powder exhibiting a color other than black and black gray, in the paper manufacturing process, the pulp slurry in each The blending concentration of the colored magnetic powder is different in each part, and is uniformly dispersed and mixed, and at the time of the wet paper state during the paper manufacturing process, the blending concentration of the colored magnetic powder is varied. A paper having a meaningful information watermark pattern applied to at least one of the parts, wherein the colored magnetic powder corresponds to the color exhibited by the paper. By showing the visibility, the color difference between the respective portions where the colored magnetic powder is mixed at different mixing concentrations cannot be visually recognized, and the colored magnetic powder is mixed in the paper. It has a unique magnetic information pattern and magnetic characteristics that can be used for authenticity determination corresponding to the shape of the meaningful information watermark pattern applied to at least one of the portions having different densities. Anti-counterfeit paper characterized by.   4. The anti-counterfeit paper according to claim 1, 2 or 3, wherein the meaningful information watermark pattern is white-squeezed with a paper thickness thinner than that of the surrounding area.   4. The anti-counterfeit paper according to claim 1, 2, or 3, wherein the meaningful information watermark pattern is black-squeezed with a thicker paper than the surrounding area.   The shape of the meaningful information watermark pattern is characterized by simultaneously applying a white squeezing with a paper thickness thinner than the surroundings and a black squeezing with a paper thickness thicker than the surroundings. Anti-counterfeit paper according to 2 or 3.   The anti-counterfeit paper according to claim 1, wherein the anti-counterfeit paper exhibits a color other than black and black-gray.   The optical characteristics of the anti-counterfeit paper exhibit 30% or more in the region where the spectral reflectance is 380 nm to 480 nm in the visible light region, and 40% or more in the region of 480 nm to 780 nm. The anti-counterfeit paper according to 3, 4, 5, 6 or 7. The colored magnetic powder has a relative spectral reflectance to the nuclear magnetic powder of 1.5 times or more at 380 nm to 480 nm, and 2 times or more at 480 nm to 780 nm. The forgery prevention paper according to 4, 5, 6, 7 or 8. The blending ratio of the blended portion of the colored magnetic powder in the pulp slurry is 0.01 to 10% by weight in terms of absolute dry pulp ratio. Anti-counterfeit paper according to 8 or 9. 11. The authenticity determination method for anti-counterfeit paper according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the non-visible colored magnetic powder blended in the paper. A method for determining the authenticity of forgery-preventing paper, wherein the authenticity is determined by detecting a unique magnetic information pattern and magnetic characteristics derived from a body and a meaningful information transparent pattern. 12. The authenticity determination method according to claim 11, wherein a unique magnetic information pattern and magnetic characteristics of a meaningful information transparent pattern applied on the anti-counterfeit paper, and a unique visible light region of the anti-counterfeit paper A method for determining the authenticity of anti-counterfeit paper, wherein the authenticity is determined by combining at least one of optical reflectance, absorption, and transmittance. The intrinsic magnetic characteristics are coercive force, residual magnetization, magnetic permeability, maximum magnetic permeability, differential value of magnetic permeability, magnetic moment and magnetic flux change, and at least one of these intrinsic magnetic characteristics should be used. 13. The method of determining authenticity of forgery prevention paper according to claim 11 or 12. 14. The forgery-preventing paper according to claim 11, wherein a magnetic sensor using a direct current bias, a magnetic sensor using an alternating current bias, or a magnetic sensor using a magnetoresistive element is used as the method for detecting the inherent magnetic characteristics. Authenticity discrimination method.

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