JP2014065174A - True/false-discriminable printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, as a printed matter printed with a material endowed with a functionality of magnetic or infrared transmission/absorption, light emission, etc., a printed matter enabling the true/false discrimination thereof via drawn lines devoid of bulges.SOLUTION: The provided printed matter possesses a first print region formed on one surface of a substrate and a second print region formed on the other surface thereof; the first print region is formed by a color material endowed with a functionality; the second print region is formed by a color material endowed with a functionality identical to that of the first print region; the first print region and second print region are at least partially formed at an overlapping position of frontal and rear surfaces.

Description

  The present invention is an invention related to authenticity printed matter having machine readability by a functional image line formed on a printed material, and in a low-thickness functional image line formed only on one surface of a substrate, The present invention relates to a true / false discrimination printed matter that is machine readable by detecting the sum of the values of functional image lines formed at the same position on the front and back surfaces, but having no machine readability.

  Since banknotes, passports, stock certificates, gift certificates, revenue stamps, various tickets and other securities have a monetary value, it is required to be provided with advanced anti-counterfeiting technology and authenticity discrimination technology. Representative examples of these anti-counterfeiting techniques and authenticity determination techniques include authenticity determination methods that identify counterfeit products and authentic products by forming confidential information using color materials having functionality such as magnetic or optical properties. Is widely used.

  As a technique using a color material having functionality, as a technique using infrared transmission and absorption ink, authenticity determination printed matter using two types of inks having different infrared reflection and absorption characteristics that are difficult to distinguish with the naked eye and authenticity A discrimination method has been proposed (see, for example, Patent Document 1).

  In the true / false discrimination printed matter of Patent Document 1, in order to reliably detect the functional data with a true / false discrimination device that is processed at high speed, such as a cash processor, it is necessary to provide a certain amount or more of functional material. Therefore, increase the printed film thickness of the functional image line formed on the printed matter, that is, form the image line with a bulge or use the ink with a large amount of functional material added to the printed film with a low print film thickness. A method of forming an image line containing a functional material is used.

JP 63-144075 A

  However, in the authenticity discrimination printed matter of Patent Document 1, when a functional image line is formed by an image line having a swell, a printing method capable of forming an image line having a swell such as intaglio printing and screen printing is used. Therefore, the problem that expensive equipment is required remains.

  In addition, a method using a printing method with a low printing film thickness such as offset printing without using a special printing method with an ink containing a large amount of functional material requires an ink containing a large amount of functional material. In addition, the flow characteristics are increased and the storage stability is decreased, so that the printability is deteriorated. As a result, the ink transfer failure occurs, and an appropriate print image line cannot be formed. It was left.

  Furthermore, as a problem common to both of the two methods described above, when a large amount of carbon black, which is an infrared absorbing material, or a magnetic material of black color is added, the print density of the functional image becomes high, and the design The problem of receiving the above restrictions remained.

  The present invention aims to solve the above-mentioned problems, and uses a general printing method such as offset printing and reduces the content of the functional material with the surface of the substrate. Printing with low film thickness is achieved by forming a print line containing a functional material so that at least part of it overlaps on the back side, and detecting the total of the functional data contained in the print line formed on the front and back sides. Even if it is an image line, it is a machine-readable authenticity discrimination printed matter.

  In the authenticity determination printed matter of the present invention, the first printing region is formed by the first color material having the first functionality on at least a part of one side of the substrate, and the at least part of the other side The second printing area is formed by the second color material having the first functionality, and the first printing area and the second printing area are formed at positions where at least a part of the front and back surfaces of the base material overlap. The first print area and the second print area are formed by image lines having a predetermined film thickness or less, and the first print area and the first print area in the area where at least a part of the second print area overlaps with each other. It is a true / false discrimination printed matter characterized in that true / false discrimination is performed based on the total value of the functionality.

  In addition, the first color material and / or the second color material in the authenticity determination printed matter according to the present invention further includes a material having a second functionality.

  In addition, each of the first functionality and the second functionality in the authenticity determination printed matter of the present invention is any one selected from magnetic characteristics, infrared transmission absorption characteristics, and light emission characteristics. It is.

  In addition, the first color material and the second color material in the authenticity determination printed matter of the present invention are authenticity determination printed matter characterized in that they are the same color or different colors.

  Further, the authenticity determination printed matter of the present invention does not include the first functionality or the second functionality at a position adjacent to the first printing area and / or the second printing area, and A true / false discrimination printed matter in which a third printing region is formed of a color material and / or a third color material having the same color as the second color material.

  In addition, the authenticity determination printed matter of the present invention is a true / false determination printed matter in which a visible image is formed by another print region formed in a region other than the first print region and the second print region. It is.

  Furthermore, the authenticity determination printed matter in which the first printing region and the second printing region in the authenticity determination printed matter of the present invention are formed by any of offset printing, letterpress printing, flexographic printing, and inkjet printing. It is.

  The true / false discrimination printed matter of the present invention has an excitement because it is possible to perform the true / false discrimination based on the total value of the functional data detected by the image lines having functionality formed on the front and back surfaces of the base material. Since it is not necessary to form an image line, there is an effect that the printing method is not limited.

  Also, the true / false discrimination printed matter of the present invention can reliably obtain functional data necessary for true / false discrimination by printing the functional image lines on the front and back sides, and the color density due to the increase in functional materials. Since there is no restriction on the rise of the image and the shape of the image line, there is an effect that the degree of freedom in design improves.

  Furthermore, since the authenticity determination printed matter of the present invention performs the authenticity determination based on the total value of the functional data in the area where the printed image lines formed on the front and back surfaces overlap, either one of the front and back surfaces is determined. Even if it is counterfeited, the machine reading is impossible, so that it has the effect of having high anti-counterfeit resistance.

The figure which shows the printed matter 1 in 1st embodiment. The figure which shows the cross section of the printed matter 1 in 1st embodiment. The figure which shows an example of the state which measured the infrared transmitted light amount of only the 1st printing area | region 3 formed in the surface of the printed matter 1 in 1st embodiment, and the measurement result detected. The figure which shows an example of the state which measured the infrared transmitted light amount of the 1st printing area | region 3 and the 2nd printing area | region 7 which were formed in the front and back of the printed matter 1 in 1st embodiment, and the measurement result detected. The figure which shows the state which measured the infrared transmitted light amount of only the 1st printing area | region 3 formed in the surface of the printed matter 1 of a comparative example. A state in which the amount of magnetism of only the first printing area formed on the printed material 1 in the second embodiment is measured, and the first printing area 3 and the second printing area 7 formed on the front and back surfaces of the printed material 1. The figure which compared the state which measured the amount of magnetism of The figure which shows the surface of the printed matter 1 in 3rd embodiment. The figure which mirror-reflected (inverted) the back surface of the printed matter 1 in 3rd embodiment. The figure which shows the surface of the printed matter in 4th embodiment The figure which mirror-reflected (inverted) the back surface of the printed matter 1 in 4th embodiment. Infrared region in which the first print region 3 formed on the front and back surfaces of the printed matter 1 in the fourth embodiment overlaps the second print region (a) 21 and the second print region (b) 22 The figure which shows the state which measured the amount of transmitted light The figure which shows the surface of the printed matter in 5th embodiment The figure which mirror-reflected (inverted) the back surface of the printed matter in 5th embodiment. The area where the first print area 25 and the second print area 7 formed on the front and back surfaces of the printed material in the fifth embodiment overlap, and the third print area 26 and the second print area 7 overlap. The figure which shows the state which measured the infrared transmitted light quantity of the area

  Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments to be described below, and includes various other embodiments within the scope of the technical idea described in the claims.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings. FIG. 1A shows the surface of a printed material 1 on which a first printing region 3 is formed in a true / false discrimination printed material 1 (hereinafter referred to as “printed material”) of the present invention. This is a gift certificate type printed matter 1 in which another printing region 4 is formed.

  The first printing region 3 needs to be formed with an ink containing a functional material. Examples of the ink containing the functional material include a magnetic ink having a magnetic property, an ink having a metameric function such as an infrared absorption property, and the like. A luminescent ink or the like can be used. The printed matter 1 in the first embodiment will be described using an example using a material having infrared absorption characteristics. Here, the first printing region 3 is formed using a red infrared absorbing ink containing 4% by weight of carbon black as a color material having infrared absorption characteristics.

  In the first printing region 3, an octagonal pattern is formed by solid printing with a printing film thickness of about 1 μm by offset printing. The spectral reflectance around the wavelength region 900 nm in the first print region 3 is about 22%.

  FIG. 1B shows the back surface of the printed material 1 according to the first embodiment as a mirror-reflected state. The back surface of the printed material 1 has at least the first print region 3 in FIG. The second print area 7 is formed as a part of it overlapping. In addition, the 2nd printing area | region 7 is formed using the yellow-green infrared absorption ink which mix | blended carbon black 4.5% by weight as a material which has an infrared absorption characteristic similarly to the 1st printing area | region 3. did.

  The second printing region 7 is a region in which a cross-shaped pattern is formed by solid printing with a printing film thickness of about 1 μm by offset printing. The spectral reflectance around the wavelength region 900 nm in the second print region 7 is about 17%.

  Further, when a material having infrared absorption characteristics is used, the first print region 3 formed on the front surface and the second print region 7 formed on the back surface have a spectral reflectance in the wavelength region 900 nm of 15 to 25. %, And if the total value of the infrared absorption characteristics formed in both regions is 10% or less, the machine readability can be stably obtained, so that it can be set as appropriate.

  If the spectral reflectance in the first printing region 3 is less than 15%, the brightness is remarkably lowered and the design is restricted, which is not preferable. In addition, when the spectral reflectance is higher than 25%, the infrared absorption characteristics formed on the front and back surfaces may be satisfied unless the spectral reflectance in the second printed region 7 formed on the back surface is less than 15%. Since this is not possible, the machine readability becomes unstable. As a result, the spectral reflectance of either one of the surfaces must be less than 15%, which is not preferable.

  In addition, when the difference in infrared absorption characteristics between the first printed region 3 formed on the front surface of the printed matter 1 and the second printed region 7 formed on the back surface is increased, the brightness of one surface is significantly reduced. The difference in infrared absorption characteristics between the first printing region 3 and the second printing region 7 is preferably within 5%.

  Moreover, although the 1st printing area | region 3 and the 2nd printing area | region 7 of the printed matter 1 in 1st embodiment were formed using the offset printing system, it does not specifically limit about a printing system, Offset printing, a letterpress Common printing methods such as printing, flexographic printing, and inkjet printing can be used, and are not particularly limited.

  The first print area 3 and the second print area 7 are formed with an image line having a printed film thickness of about 1 μm, but the first print area 3 and the second print area 7 in the printed matter of the present invention are formed. The film thickness may be formed with an image line of 5 μm or less, preferably 0.5 μm to 3 μm. If the printed film thickness exceeds 5 μm, the ink density increases and the brightness decreases significantly, which is not preferable because it is restricted by design. In the printed matter 1 according to the first embodiment, the print film thicknesses of the first print region 3 and the second print region 7 are both described with an image line of about 1 μm. If the total value of both functionalities satisfies the machine reading suitability, the film can be formed with different film thicknesses.

  Furthermore, in the first embodiment, the first printing area 3 and the second printing area 7 have been described with examples of different color inks. However, the same ink or the same color ink including other functionalities is used. May be used.

  FIG. 2 is a cross-sectional view showing a state in which the first printing region 3 and the second printing region 7 of the printed matter 1 in the first embodiment are formed. The first print region 3 is formed, and the second print region 7 is formed at a position at least partially overlapping with the first print region 3 formed on the other surface. In FIG. 2, the first print area 3 and the second print area 7 are illustrated as lines having a relatively high bulge from the base material. It is formed with.

  Next, the machine readability of the printed matter in the first embodiment will be described with reference to FIGS. FIG. 3A shows a state in which the first printing region 3 is formed on the surface of the substrate, that is, the cross section and the infrared transmitted light amount of the printed matter 1 before the second printing region 7 is formed. It shows the measured state, the light source 10 is provided on the front side of the printed matter 1 conveyed in the first direction, the optical sensor 11 having a peak sensitivity wavelength of 900 nm is provided on the back side, and the red color of the printed matter 1 during conveyance. The amount of external transmitted light is measured.

  FIG. 3B is a waveform 12 of the infrared transmitted light amount obtained by the measurement in FIG. 3A, and the infrared transmitted light amount is reduced on the first print region 3. In addition, the waveform 13 in the waveform 12 corresponds to the first print area 3, and it is necessary to binarize at a predetermined reference level 14 in order to detect the first print area 3 as an infrared absorption area. However, since there is little difference from the waveform of the area other than the first print area 3, when binarization is performed at a predetermined reference level 14, a waveform as shown in FIG. The other areas cannot be separated into “0” and “1”, and the first print area 3 cannot be detected. The same applies when only the second print region 7 is formed.

  On the other hand, Fig.4 (a) showed the state which measured the infrared transmitted light amount of the 1st printing area | region 3 and the 2nd printing area | region 7 which were formed in the front and back of the printed matter 1 in 1st embodiment. FIG. 4B is a waveform 12 of the amount of transmitted infrared light obtained by the measurement of FIG.

  As apparent from FIG. 4B, when the first print area 3 and the second print area 7 are measured with the transmission optical sensor 11, the first print area formed on the front and back surfaces. Since the total value of the infrared absorption characteristics of each of the third and second print regions 7 is detected, the infrared absorption characteristics 15 exceeding the reference value 14 can be detected.

  As shown in FIG. 4C, the infrared absorption region, which is the region where the first printing region 3 and the second printing region 7 overlap, and other regions are clearly separated into “0” and “1”. Therefore, authenticity determination can be performed.

  As described above, in the case where only one of the first print area 3 and the second print area 7 formed on the surface of the printed material 1 has an infrared absorption characteristic, it is included in the first print area 3. Infrared absorption characteristics to be detected cannot be detected at a level different from other regions, but as shown in FIG. 4A, the first printing region 3 and the second printing region 7 are formed on the front and back surfaces of the substrate. Can be detected by the total value of the infrared absorption characteristics formed on the front and back surfaces, so that the printed film thickness formed by a general printing method such as offset printing is about 1 μm. Even if the reflectance of the wavelength region 900 nm in each region is about 20%, the infrared absorption region can be reliably detected.

  In addition, as in the ink used in the first embodiment, as described in the example of the red infrared absorbing ink and the yellow-green infrared absorbing ink using carbon black as a material having infrared absorption characteristics, Since it can be detected by the total value of the infrared absorption characteristics formed on the front and back surfaces, the amount of carbon black added can be reduced to 4%, so inks with relatively high brightness such as red and yellow-green are used. Since the first printing area 3 and the second printing area 7 can be formed, there is no restriction on the design surface, and the pigment content does not increase remarkably. Absent.

  In the first embodiment, the first printing area 3 and the second printing area 7 are solid printing, and the area where the two image lines overlap is provided in a wide area. The area where the third print area 7 and the second print area 7 overlap may be appropriately set depending on the resolution of the optical sensor 11. For example, as described in Japanese Patent No. 5005760, one wavelength is about 16 dpi (about 1.5 mm per pixel). In order to obtain a state in which stable identification is possible when scanning with, the vertical and horizontal widths of the portions where the front and back symbols overlap must be 4.5 mm or more. When the area of the area where the first print area 3 and the second print area 7 overlap only has a size that does not match the resolution of the optical sensor 11, it is detected as noise, and thus formed on both surfaces. This is because the functional data cannot be detected accurately.

  Furthermore, as described above, the printed matter 1 according to the first embodiment has an infrared absorption region and another region only in the first print region 3 or the second print region 7 formed on any one surface. Infrared absorption of only the first printing region 3 or the second printing region 7 containing the infrared absorbing material formed when any one side of the printed material 1 is counterfeited. Therefore, it is impossible to detect the infrared absorption characteristic equivalent to the genuine product. Therefore, it can be easily determined that the product is a counterfeit product.

(Comparative example)
Here, as a comparative example, the printed matter 1 in the first embodiment shown in FIG. 4A is formed by a printed image line having infrared absorption characteristics formed on one surface of the printed matter as in the conventional printed matter. A comparative example in which an image line having a high printing film thickness is formed by intaglio printing in order to obtain an infrared absorption characteristic equivalent to the above will be described with reference to FIG. The ink used in the comparative example formed a printed image line having a film thickness of about 10 μm with a brown infrared absorbing ink containing 4% by weight of carbon black as a material having infrared absorbing characteristics. The spectral reflectance in the wavelength region 900 nm is about 10%.

  As shown in FIG. 5, in order to obtain an infrared absorption characteristic equivalent to that of the printed matter 1 in the first embodiment by an image line printed on one surface of the substrate, a print image line containing carbon black is increased. Equivalent infrared absorption characteristics can be obtained by using a printed image line with a film thickness. In this case, the printing method for forming an image line having a bulge is limited to a special printing method such as intaglio printing and screen printing, and also increases the amount of ink used, the curability of the ink film, and the storage stability of the ink. Various problems occur, such as degradation.

  As another method, as in the first embodiment, a method using a printing method having a relatively thin film printing film thickness such as offset printing will be described. In order to obtain an infrared absorption characteristic equivalent to that of the first embodiment from a printing region having a relatively small printing film thickness, a large amount of carbon black contained in the ink forming the first printing region 3 is used. It is necessary to use an increased amount of ink, and an ink with an increased amount of carbon black increases the pigment content, so the flow characteristics such as tack value, viscosity, and yield value increase, and the printability is satisfied. Therefore, it is difficult to form a functional image line that satisfies the functional data with a low-thickness print image line.

  In addition, as in the case of printing with a large film thickness using intaglio ink, a large amount of carbon black needs to be added, so that the brightness of the ink is remarkably lowered and the design is restricted.

(Second embodiment)
The printed matter in the second embodiment will be described. In addition, about 2nd embodiment, it is set as the same image line structure as the printed matter 1 of 1st embodiment, and the functionality contained in the ink which forms the 1st printing area | region 3 and the 2nd printing area | region 7 is used. Since the material is formed of ink having magnetic properties, description of the image line configuration is omitted.

  FIG. 6 is a cross-sectional view of the printed matter 1 and a machine reading appropriateness in the second embodiment. FIG. 6A shows a state in which the magnetic properties are measured in a state where only the first printing region 3 is formed on one side of the printed matter 1 in the second embodiment, and in the first direction. The magnetic sensor 16 which reads the magnetic quantity on the 1st printing area | region 3 in the printed matter 1 conveyed is provided, and the magnetic quantity at the time of conveyance is measured.

  FIG. 6B shows the measurement of the magnetic quantity in the first print area 3 and the second print area 7 formed on the front and back surfaces of the printed matter 1 by the magnetic sensor 16. The total value of the magnetic quantity in the 2nd printing area | region 7 is shown.

  As is clear from a comparison between FIGS. 6A and 6B, in the state where the first printing region 3 is formed only on one surface of the printed matter 1 shown in FIG. The detection level is small, and the region imparted with the magnetic characteristics and the other region cannot be separated by the predetermined reference level 19. On the other hand, as shown in FIG. 6B, when the total value of the amount of magnetism of the first print area 3 and the second print area 7 formed on the front and back surfaces of the printed matter 1 is detected, the magnetic force is substantially doubled. Since the amount is detected, the region imparted with the magnetic characteristics and the other region can be clearly separated by the predetermined reference level 19, so that the authenticity determination can be performed.

  As described in the first embodiment and the comparative example, in order to obtain the detection voltage shown in FIG. 6B by the image line including the magnetic material formed on one side of the printed matter, intaglio printing, etc. It is conceivable to form a print line with a high film thickness using a special printing method, or to form a line with a relatively low film thickness such as offset printing with a magnetic ink containing a large amount of magnetic material. When a special printing machine is used, cost performance is low due to the above-described problems. In addition, an ink containing a large amount of magnetic material has a remarkably deteriorated flow characteristic, so that an appropriate printed film thickness cannot be obtained.

(Third embodiment)
FIG. 7 shows the printed matter 1 in the third embodiment, and as a point different from the first embodiment, the first printing region 3 and the second printing formed on the front and back surfaces of the printed matter 1. The region 7 is formed by a collection of a plurality of diamond-shaped image lines formed regularly across a non-image area having a predetermined pitch and width.

  FIG. 7A shows the surface of the printed material 1 according to the third embodiment, and, similarly to the printed material according to the first embodiment, another printed region 4 such as a face value is formed on the base material 2. This is a gift certificate type printed matter 1 in which a first printing region 3 is formed.

  FIG. 7B is an enlarged view of the first printing region 3 shown in FIG. 7A. By offset printing, the rhombus 5 having a printed film thickness of about 1 μm and a side length of about 0.9 mm is shown. An octagonal pattern is formed by a set of rhombuses 5 formed in a lattice shape by regularly forming a plurality of image lines with a predetermined pitch and sandwiching a non-image part 6 having a width of 0.1 mm. It is. The image area ratio per unit area in the first printing region 3 is 80%, and the spectral reflectance around the wavelength region 900 nm is about 19%.

  FIG. 8A shows the back surface of the printed matter 1 in the third embodiment as a mirror-reflected state. The back surface of the printed matter 1 has at least the first print region 3 in FIG. The second print area 7 is formed as a part of it overlapping. The second printing region 7 is a non-image line having a regular thickness of 0.1 mm and a rhombus 8 image line having a printed film thickness of about 1 μm and a side length of 1.2 mm by offset printing. By forming a plurality of portions 9 across the portion 9, a cross-shaped pattern is formed by a set of rhombuses 8 formed in a lattice shape. The image area ratio per unit area in the second print region 7 is 85%, and the spectral reflectance around the wavelength region 900 nm is about 17%.

  Regarding the machine reading appropriateness of the printed material 1 in the third embodiment, the infrared absorption characteristics of the first printed region 3 formed on the front surface of the printed material 1 and the second printed region 7 formed on the back surface of the printed material 1. Thus, it can be clearly separated from the infrared absorption characteristics of other regions.

  Further, as a modification of the printed matter 1 in the third embodiment, an intaglio ink having infrared transmission characteristics is formed on the first printing region 3 having infrared absorption characteristics formed on the surface of the substrate 2. It is also possible to do this (not shown), in which case the lattice pattern formed in the first print area 3 can be camouflaged.

  In addition, as in the printed matter 1 of the first embodiment, it is possible to print intaglio ink having infrared transmission characteristics on the first printing region 3 formed with a solid image line. When the intaglio printing is performed on the area where the ink is applied, there is a concern that a trapping defect of the intaglio ink occurs. However, like the printed matter 1 in the third embodiment, it has a regular non-image portion formed in the first printing area 3 and the second printing area 7, so that the intaglio ink trapping failure is prevented. Since generation | occurrence | production can be suppressed, printed matter can be produced, without impairing printability.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to the drawings. The printed matter 1 in the fourth embodiment is configured differently from the first to third embodiments, and arbitrarily sets the position and area where the first print region 3 and the second print region 7 overlap. Thus, predetermined information can be given.

  FIG. 9 shows the surface of the printed matter 1 in the fourth embodiment, and the first printing region 3 has the same configuration as that in the first embodiment. The ink used in the fourth embodiment is a non-image that is regularly arranged at a predetermined pitch and a predetermined width by flexographic printing using a blue infrared absorbing ink containing 3% by weight of carbon black. An image including a line portion is formed.

  In the first printing region 3 in the fourth embodiment, an image line having a printed film thickness of about 3 μm was formed by flexographic printing. The spectral reflectance in the wavelength region 900 nm in the first printed region 3 was about 22%.

  FIG. 10 shows the back surface of the printed matter 1 in the fourth embodiment mirror-reflected. Similar to the first embodiment, another print area 4 such as a face and the second print area ( a) 21 and the second printing region (b) 22 are formed.

  Similar to the first printing region 3, the second printing region (a) 21 and the second printing region (b) 22 are purple reds containing 4.5% by weight of carbon black as an infrared absorbing material. Formed with a direct image line having a printed film thickness of about 1 μm and an image line width of 4.5 mm by offset printing using an external absorption ink, and completely passes through the back surface of the area where the first print area 3 is formed. It is formed as follows. The spectral reflectance in the wavelength region 900 nm in the second print region (a) 21 and the second print region (b) 22 was about 17%.

  FIG. 11A shows a measurement of the amount of infrared transmitted light of the printed matter 1 in the fourth embodiment. The light source 10 is provided on the front side of the printed matter 1 conveyed in the first direction, and the rear side is provided. An optical sensor 11 having a peak sensitivity wavelength of 900 nm is provided, and the amount of infrared transmitted light during conveyance is measured.

  FIG. 11B is a waveform 12 showing the amount of transmitted infrared light obtained by the measurement of FIG. 11A, and is a region formed by the first print region 3 and the second print region (a) 21. Corresponds to the waveform 23, and the region formed by the first print region 3 and the second print region (b) 22 corresponds to the waveform 24.

  When the waveform 12 is binarized at a predetermined reference level 14, a waveform as shown in FIG. 11C is obtained, and the second print area (a) 21 formed at a position overlapping the first print area 3 and By dividing the area where the second print area (b) 22 is formed and the other area into “0” and “1”, it is possible to detect a pattern of infrared absorption characteristics having two peaks. It was.

  As in the fourth embodiment, arbitrary information is given by arbitrarily setting the shape, area, pitch, and the like of the region where the first print region 3 and the second print regions 21, 22 overlap. It is possible to perform more sophisticated authenticity determination by machine reading these patterns.

(Fifth embodiment)
A fifth embodiment will be described with reference to the drawings. The printed matter 1 in the fifth embodiment has a configuration different from that of the first to fourth embodiments described above, at a position adjacent to the first printing region 25 formed on the surface of the substrate 2. By forming the third print region 26 with an ink that is the same color as the ink that forms the print region 25 and does not include the functional material that forms the first print region 25, the first print region This is an example of camouflaging that 25 is formed.

  As in the first embodiment, the first printing region 25 is made of a red infrared absorbing ink containing 4% by weight of carbon black as a material having infrared absorption characteristics, and has a printed film thickness of about 1 μm. A print line was formed.

  On the other hand, the third printing region 26 is a printed image line having a printing film thickness of about 1 μm with a red infrared transmission ink that is the same color as the ink forming the first printing region 25 and does not have infrared absorption characteristics. Formed. In addition, about the ink which forms the 3rd printing area | region 26, what is necessary is just the ink which does not contain the infrared absorption characteristic which formed the 1st printing area | region 25. It is also possible to include a magnetic material or a light emitting material.

  In addition, the first print area 25 and the third print area 26 are octagonal patterns formed by a set of a plurality of rhombuses that are regularly formed with a non-image portion having a predetermined pitch and a predetermined width interposed therebetween. Is formed. Each of the rhombuses formed in the first print area 25 and the third print area 26 are arranged adjacent to each other with a boundary in the center of the octagonal pattern, that is, a symmetrical boundary line. Therefore, the boundary between the first print area 25 and the third print area 26 cannot be distinguished with the naked eye.

  The first print region 25 and the third print region 26 are observed as the same color with the naked eye, but the spectral reflectance in the wavelength region 900 nm is about 20% in the first print region 25, and The third print area 26 is about 95%.

  FIG. 12 (a) shows the surface of the printed matter 1 according to the fifth embodiment. Using a red infrared absorbing ink containing 4% by weight of carbon black as an infrared absorbing material, One print area 25 is formed. Further, the third printing is performed by using an ink having an infrared transmission characteristic at a position adjacent to the first printing region 25 and having the same color as the infrared absorbing ink in which the first printing region 25 is formed. Region 26 is formed. The first print area 25 and the third print area 26 are observed as a uniform color octagonal pattern by arranging both areas adjacent to each other.

  FIG. 12B shows an octagonal pattern in which the first print area 25 and the third print area 26 shown in FIG. 12A are enlarged, and the first print area 25 is offset printing. Thus, by forming a plurality of rhombus 5 image lines having a printed film thickness of about 1 μm and a side length of about 0.9 mm with a non-image portion 6 having a width of 0.1 mm sandwiched at a predetermined pitch, A half of the octagonal pattern is formed by a set of rhombuses 5 formed in a lattice shape.

  Similarly to the first printing area 25, the third printing area 26 regularly prints an image line of the rhombus 5 having a printing film thickness of about 1 μm and a side length of about 0.9 mm by offset printing. By forming a plurality of non-image portions 6 having a width of 0.1 mm at a pitch, half of the octagonal pattern is formed by a set of rhombuses 5 formed in a lattice shape. The image area ratio per unit area in the first printing region 25 and the third printing region 26 is 80%, and the spectral reflectance near the wavelength region 900 nm is about 20% in the first printing region 25. Yes, the third print area 26 is about 95%.

  In FIGS. 12A and 12B, the first print area 25 and the third print area 26 are shown in different colors in order to explain them separately. As observed.

  FIG. 13A shows the back surface of the printed matter 1 in the fifth embodiment as a mirror-reflected state, as in the first embodiment, and other print areas 4 such as the face value, A second print area 7 is formed.

  FIG. 13B is an enlarged view of the second printing area 7 shown in FIG. 13A, and a yellow-green infrared absorbing ink containing 4% by weight of carbon black is used as an infrared absorbing material. By offset printing, a plurality of rhombus 8 image lines having a printed film thickness of about 1 μm and a side length of 1.2 mm are regularly formed at a predetermined pitch with a non-image portion 9 having a width of 0.1 mm interposed therebetween. Thus, a cross-shaped pattern is formed by a set of rhombuses 8 formed in a lattice shape. The image area ratio per unit area in the second printing region 7 is 85%, and the spectral reflectance around the wavelength region 900 nm is about 20%.

  FIG. 14A shows a measurement of the amount of infrared transmitted light of the printed matter 1 in the fifth embodiment. The light source 10 is provided on the front side of the printed matter 1 conveyed in the first direction, and the rear side is provided. An optical sensor 11 having a peak sensitivity wavelength of 900 nm is provided, and the amount of infrared transmitted light during conveyance is measured.

  FIG. 14B is a waveform 12 of the amount of infrared transmitted light obtained by the measurement of FIG. 14A, and a region where the first print region 25 and the second print region 7 overlap on the front and back surfaces of the printed matter 1. Corresponds to the waveform 15.

  When the waveform 12 is binarized to a predetermined reference level 14, a waveform as shown in FIG. 14C is obtained, and an area formed by overlapping the first print area 25 and the second print area 7, and the third By separating the area formed by overlapping the print area 26 and the second print area 7 into “0” and “1”, the first printing equivalent to the printed matter 1 in the first embodiment is made to the naked eye. A pattern having infrared absorption characteristics that cannot be observed with the naked eye can be detected from the printed material 1 on which a visible image equivalent to the printed material on which the region 3 and the second printed region 7 are formed is observed.

  As described above, the first print area 25 and the third print area 26 are formed on the front surface of the printed matter 1, and the first print area 25 and the third print area 26 are formed on the back surface so as to overlap. Since the second print region 7 can be classified by a predetermined infrared transmission / absorption pattern that is not observed with the naked eye, it is possible to perform more advanced authenticity determination.

DESCRIPTION OF SYMBOLS 1 Printed material 2 Base material 3 1st printing area 4 Other printing areas 5 Diamond which forms 1st printing area 6 Non-image part which forms 1st printing area 7 2nd printing area 8 2nd printing Diamond forming area 9 Non-image portion forming second print area 10 Light source section 11 Optical sensor 12 Waveform of infrared transmitted light 13 Waveform corresponding to first print area 14 Reference level 15 First print area And a waveform corresponding to the second print area 16 Magnetic sensor 17 Waveform of the amount of magnetism 18 Waveform corresponding to the first print area 19 Reference level 20 Waveform corresponding to the first print area and the second print area 21 First Second printing area (a)
22 Second printing area (b)
23 Waveform corresponding to the second print area (a) 24 Waveform corresponding to the second print area (b) 25 First print area 26 Third print area

Claims (7)

The first printing region is formed by the first color material having the first functionality on at least a part of one surface of the substrate,
A second printing region is formed by the second color material having the first functionality on at least a part of the other surface,
The first print area and the second print area are formed at positions where at least part of the front and back surfaces of the base material overlap,
The first print area and the second print area are formed by an image line having a predetermined film thickness or less,
An authenticity determination printed matter, wherein authenticity determination is performed based on a total value of the first functionality in an area where at least a part of the first printing area and the second printing area are arranged to overlap.   The authenticity printed matter according to claim 1, wherein the first color material and / or the second color material further includes a material having a second functionality.   The said 1st functionality and said 2nd functionality each are any one selected from a magnetic characteristic, an infrared transmission absorption characteristic, and a light emission characteristic, The Claim 1 or 2 characterized by the above-mentioned. True / false discrimination printed matter.   The authenticity printed matter according to any one of claims 1 to 3, wherein the first color material and the second color material are the same color or different colors.   The position adjacent to the first print area and / or the second print area does not include the first functionality or the second functionality, and the first color material and / or the The authenticity discrimination printed matter according to any one of claims 1 to 4, wherein a third printing region is formed by a third color material having the same color as the second color material.   The visible image is formed by another print region formed in a region other than the first print region and the second print region. True / false discrimination printed matter.   The first printing area and the second printing area are formed by any one of offset printing, letterpress printing, flexographic printing, and inkjet printing. Authenticity printed matter.

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