JP2008055639A - Authenticity-discriminable printed matter and truth authenticity discriminating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide authenticity-discriminable printed matter and an authenticity discriminating method which enable simple, efficient and effective discrimination of authenticity. <P>SOLUTION: The authenticity-discriminable printed matter 1 is constituted by forming on a base an electromagnetic wave excited luminescence ink image 10 and a stress luminescence ink image 2 overlapping the image 10 partially at least. The printed matter 1 is irradiated with an electromagnetic wave from an electromagnetic wave irradiation part 3 and an electromagnetic wave luminescence pattern generated thereby is read by a reading part 6 and made a first luminescence image 11. Next, stress is given by a stress giving part 4 in a state wherein a luminescence material is activated by the irradiation with the electromagnetic wave, and a stress luminescence pattern generated thereby is read by the reading part 6 and made a second luminescence image 12. The first luminescence image 11 and the second luminescence image 12, or a first luminescence intensity pattern 13 and a second luminescence intensity pattern 14, are compared with each other by an authenticity-determining part 9, and in the case when a difference predetermined in conformity with the given stress is recognized, the printed matter is determined to be authentic. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a printed matter that facilitates authenticity determination against counterfeiting of valuable printed matter such as banknotes and securities, and a method for determining authenticity of the printed matter.

  With the recent development of digital devices such as scanners, printers, and color copiers, it has become possible to easily produce elaborate copies of precious printed matter. As one of countermeasures, luminescent inks such as fluorescent light and phosphorescent light are added as anti-counterfeiting and authenticity determination elements.

  As a method for determining the authenticity of a precious printed matter to which these luminescent inks are applied, a light emitting element that is applied to the printed matter by irradiation of electromagnetic waves such as light or energy containing energy that excites the luminescent material, or by applying an electric field or chemical reaction. It is a general purpose to confirm the luminescence of the eyes visually or with a sensor.

  As a material relating to such a material using an optical function, a commuter pass excellent in forgery prevention using a fluorescent ink or a transparent infrared absorbing ink has been proposed (for example, see Patent Document 1). In addition, a forgery prevention sheet having secret information such as characters formed with transparent fluorescent ink has been proposed (for example, see Patent Document 2).

  As described above, some luminescent substances have various compositions, but in recent years, materials that emit light by external mechanical energy (hereinafter referred to as “stress”) such as pressure, shear, or friction (hereinafter referred to as “stress”). Research and development of “stress luminescent materials” is underway. The results of research and development of materials that emit light by these mechanical energies are described in a series of patent documents (for example, see Patent Documents 3 to 5).

  Xu et al., Who developed stress-stimulated luminescent materials as shown in Patent Documents 3 to 5, describe sensing such as stress distribution analysis and application to various displays based on their stress responsiveness (for example, Non-Patent Document 1, 2).

  Utilizing the properties of stress-stimulated luminescent materials described in these patent documents, etc., it has been proposed to be applied to designs such as toys using composite materials that can emit light by simply touching them with your hand or fingers. (For example, see Patent Documents 6 and 7)

  An article for authenticity determination and an authenticity determination apparatus (e.g., a patent) capable of determining the authenticity of an article even in a dark field without using a special light source for the article to be authenticated by using a stress luminescent material. Reference 8) is also provided with a portion that emits light without irradiating light from the outside world for display by the user's selection and operation, so that the information attached by the provider can be displayed to the user. On the other hand, an information display sheet (for example, see Patent Document 9) that is visually displayed has been proposed.

JP-A-6-227192 JP 9-183288 A Japanese Patent No. 3136340 Japanese Patent No. 3265356 Japanese Patent No. 3273317 JP 2003-253261 A JP 2004-137351 A JP 2006-116778 A Japanese Patent Laid-Open No. 2006-116777 AIST Today (Publicity Magazine) VOL.2 No.8 Latest Trends of Phosphors by Basics and Applications, Published by Information Technology Co., Ltd .: p261-p277 (2005 edition)

  As in Patent Documents 1 and 2, the main light emitting materials conventionally used for authenticity determination of security printed materials are light emission by electromagnetic wave excitation mainly using light, and these light emitting materials are used for authenticity determination. For this reason, tools such as black light are necessary, and these tools are generally not tools that many people have, and if it is not an environment where tools can be prepared, there is a problem that true / false discrimination cannot be performed .

  In any of Patent Documents 3 to 7 and Non-Patent Documents 1 and 2, the stress luminescence is applied to stress distribution visualization technology, various displays, and artificial luminescent skin for entertainment. However, it does not describe application to printed matter, forgery prevention, and authenticity discrimination printed matter.

  In Patent Documents 8 and 9, a luminescent agent using the stress luminescent material described in the above-mentioned Patent Document of Xu et al. Is disposed on a part of a flat substrate such as an authenticity discrimination article or an information display sheet. Then, the substrate is bent, pressed, or rubbed to emit light to determine authenticity.

  Articles that require authentication are often mainly substrates on flat plates such as paper or plastic sheets, and it is efficient and often used to provide materials for authentication and the like by printing or coating. Has been. However, when applying a composite containing a stress luminescent material (hereinafter referred to as “stress luminescent ink”) used in Patent Documents 8 and 9 by printing or coating, etc., the flow characteristics suitable for the application method are adjusted. Therefore, there is a problem that a stress-stimulated luminescent material that has sufficient light emission intensity cannot be contained.

  In addition, when applying by printing, coating, etc., there may be cases where the coating amount that has sufficient light emission intensity may not be given depending on the form of the authenticity discriminating object, so that authenticity cannot be determined sufficiently depending on the environmental conditions. Alternatively, if a high stress is applied to make the determination, the applied ink film may be destroyed.

  As described above, in the authenticity discriminating product using light emission due to stress, particularly when the authenticity discriminating product is a flat substrate, the stress light emission sufficient to be easily confirmed by the stress that can be applied under general conditions is exhibited. There was a problem that the applied ink film was not or was destroyed.

  That is, the problem to be solved by the present invention is to provide a true / false discrimination printed matter and a true / false discrimination method that can be performed simply, efficiently and effectively by using stress-stimulated luminescent ink as a true / false discrimination element. The purpose is to do.

  The true / false discrimination printed matter of the present invention includes a first image area printed on at least a part of a surface of a substrate using a first ink containing a mechanoluminescent material on at least a part of the surface. And a second image area printed with a second ink containing a photoluminescent material.

  The authenticity determination printed matter of the present invention is characterized in that the first image area and the second image area are at least partially overlapped or not overlapped.

  In the authenticity determination printed matter of the present invention, at least a part of the first image area and the second image area overlaps at least a part of the second image area overlaps the first image area. The first region is covered with a second region, and the second image region has at least a region other than the first image region.

  The authenticity determination printed matter of the present invention is characterized in that the same kind or different kind of base material is laminated on the first image region and the second image region.

  The mechanoluminescence material for authenticity printed matter of the present invention is characterized by having both light emission due to stress and phosphorescence due to electromagnetic wave excitation.

  The authenticity printed matter of the present invention is characterized in that the first ink and / or the second ink contains at least one of a color pigment, a glittering material, and an adhesive.

  The first image area of the true / false discrimination printed matter of the present invention is printed by intaglio printing or screen printing, and the ink film thickness of the first ink is 20 μm or more.

  In the first image area of the authenticity determination printed matter of the present invention, the first ink is solidified or fixed on the substrate by irradiation with an electron beam having an acceleration voltage of 30 to 200 kV.

  The authenticity determination method of the authenticity determination printed matter of the present invention includes a step of reading a first light emission image generated by irradiating an electromagnetic wave to the authenticity determination printed matter with a sensor, and an authenticity in a state where the luminescent material is activated by the electromagnetic wave irradiation. The step of reading a second light-emitting image generated by applying stress to the discrimination printed matter with a sensor and comparing the first light-emitting image by irradiation with electromagnetic waves and the second light-emitting image by applying stress are characterized in that authenticity determination is performed. To do.

  The authenticity determination method for authenticity determination printed matter according to the present invention includes a step of irradiating an electromagnetic wave to the authenticity determination printed matter, and applying stress to the first and second image regions in a state where the light emitting material is activated by the electromagnetic wave. A step of reading the light emission intensity of each of the first image area and the second image area emitted by the applied stress with a sensor, and the light emission intensity of the read first image area and the second image area It is characterized in that authenticity determination is performed based on the difference.

  The true / false discrimination printed matter of the present invention includes, on at least one surface of a base material, a first image region printed using a first ink containing a mechanoluminescent material in at least a partial region on the surface; A printed matter comprising a second image region including at least a region that overlaps at least a portion of the first image region printed using the second ink containing the photoluminescent material, or a region other than the first image region, Even without using special tools such as ultraviolet lamps, authenticity can be easily determined with natural light and general lighting equipment.

  Furthermore, when other color materials are used in combination, light emission due to electromagnetic wave excitation and / or the color material image is confirmed at a glance, so the light emission due to stress is not noticed and Camouflage false discrimination elements.

  The authenticity determination printed matter and its authenticity determination method according to some embodiments of the present invention will be described below.

  The authenticity printed matter in the present invention is a mechanoluminescence material and a photoluminescent material, in which a light emitting material having different properties is provided on at least one surface of the authenticity distinguishing printed matter, and these light emitting materials are At least one authenticity determination element is formed.

  Luminescence is a light-emitting phenomenon in which a substance receives energy by electromagnetic waves, heat, friction, etc. and is excited, and emits the received energy as light of a specific wavelength, and has different characteristics used in this embodiment. One of the light emission phenomena is photoluminescence excited by light, and one is mechanoluminescence by physical force.

The mechanoluminescence (hereinafter referred to as “stress light emission”) material is described in Japanese Patent No. 2999631, Japanese Patent No. 3421736, Japanese Patent No. 3511083, Japanese Patent Laid-Open No. 2003-253261, or Japanese Patent Laid-Open No. 2005-75838. What is done is desirable.
As the photoluminescence (hereinafter referred to as “electromagnetic wave emission”) material, generally known light emitting materials can be used.

  As the stress-stimulated luminescent material, a stress-stimulated luminescent material formed by doping an inorganic base material with a luminescent center composed of one or more of rare earth elements or transition metals that emit light when electrons excited by stress return to the ground state, or non-chemically. Some include a stress-stimulated luminescent material that includes at least one kind of aluminate having a stoichiometric composition and has lattice defects that emit light when electrons excited by stress return to the ground state.

Stress-stimulated luminescent materials can be divided into stress-stimulated fluorescent materials and stress-stimulated phosphorescent materials according to the decay time of light emission by given energy, and CaMgSiO ₇ : Ce as a material having fluorescent properties due to excitation of energy including electromagnetic waves. , SrNb ₂ O ₆ : Eu, and the like.

As a more desirable material, the stress-stimulated luminescent material used in the embodiment of the present invention is such that the electrons excited by the energy of electromagnetic wave irradiation in the inorganic base material are once trapped in the metastable excited state or trap of the emission center. Among phosphorescent material phosphors that emit light by the tunnel effect or the thermal activation process, the afterglow emitted when the electrons further excited by the stress return to the ground state from the metastable excited state or the trap. It contains a material that also has a stress luminescence mechanism. Examples of materials having such properties include CaAl ₂ O ₄ : Eu, Nd, Sr _0.9 Al ₂ O _3.90 : Eu _0.01 . Because phosphorescence is emitted by excitation of electromagnetic waves with relatively low energy in the visible range, materials can be excited without the need for special tools, making use of both the properties of electromagnetic emission and stress emission. By doing so, there is an advantage that more efficient discrimination is possible.

The stress-stimulated ink, which is the first ink containing the stress-stimulated luminescent material, which is one of the inks for obtaining the true / false discrimination printed matter of the embodiment of the present invention, will be described.
Stress luminescent inks are inks or pastes of stress luminescent materials so that they have properties suitable for printing to obtain authenticity printed matter, but the stress luminescent materials and other color materials or functional materials May be mixed into an ink or a paste.

  Stress luminescent ink consists of a stress luminescent material, a vehicle component, an auxiliary agent, etc., and as a method to be applied to the substrate, there are printing by letterpress, offset, flexo, gravure, screen or intaglio, ink jet printing or coating, etc. The blending ratio is adjusted so that the ink form suitable for the method is taken.

  Stress light-emitting ink has a stress light-emitting ink characteristic suitable for the printing method applied to the base material, and the blending ratio of the stress light-emitting material is determined based on a balance between the two so that the light emission intensity necessary for detection can be obtained. . The mixing ratio of the stress-stimulated luminescent material in the stress-stimulated ink varies depending on the application method, but may be about 1 to 60% by weight. From the viewpoint of light emission intensity and economy, it is more desirable that the content be 10 to 40% by weight.

  Further, when authenticity determination is performed, stress such as pressurization, shearing, and friction is directly applied to the applied stress-stimulated luminescent ink film, so that it is necessary to have a vehicle blend sufficiently containing a low elastic component. In addition, it is necessary to select a solidification or fixing condition that forms a film having physical properties that can cope with the application of stress such as continuous pressurization, shearing, and friction when determining authenticity.

  In the present embodiment, since stress is applied to the printed material, it is necessary to provide sufficient resistance to the stress-stimulated luminescent ink applied to the printed material. Therefore, a radiation irradiation method is effective as one of the means for solidifying or fixing the stress-luminescent ink. Examples of radiation include microwaves, infrared rays, visible rays, laser beams, ultraviolet rays, X-rays, electron beams, neutron rays, proton rays, and the like, and the electron beam is most desirable for the stress-stimulated ink of the present embodiment. What is necessary is just to select the energy of the electron beam to irradiate with the film thickness of stress luminescent ink. In particular, irradiation with an electron beam having an acceleration voltage of 30 to 200 kV from an ultra-low energy to a low energy region is suitable for solidifying or fixing a stress-stimulated ink for authenticity printed matter.

  In general, since the acting force of the electron beam varies depending on the Z-axis direction of the active substance, in the stress-luminescent ink according to the present embodiment applied to the printed matter, the physical properties of the coating in the thickness direction of the stress-luminescent ink coating film are Because it differs, by selecting the appropriate acceleration voltage and irradiation current value according to the coating thickness, the surface portion of the stress-stimulated luminescent ink film has a high bridging density and high hardness, but the depth increases from the surface. As the crosslinking density decreases, flexibility can be maintained. This suggests that both resistance to application of stress such as friction to the surface for discrimination and propagation of applied stress necessary for light emission can be achieved. That is, the ink surface is resistant to stresses such as friction, and the stress imparted by the flexibility inside the ink can be efficiently converted to light emission. Therefore, it can be said that the electron beam irradiation is a fixing method suitable for authenticity determination using the stress-stimulated luminescent ink applied to the substrate surface.

The electromagnetic wave luminescent ink, which is the second ink containing the electromagnetic wave luminescent material, which is another ink for obtaining the authenticity printed matter of the embodiment of the present invention will be described.
The electromagnetic light emitting ink is generally formed into an ink or paste by a known method using a known light emitting material, but may be produced in the same manner as the stress light emitting ink. Moreover, you may mix with another color material or a functional material. The light emitting material to be used is selected according to the characteristics of the stress light emitting material and the authenticity printed matter to be produced.

An authenticity printed matter according to an embodiment of the present invention will be described.
The authenticity printed matter is produced by printing or coating an arbitrary portion on the surface of the base material by the generally known printing method using the stress-stimulated luminescent ink and electromagnetic luminescent ink described above.

  As a method of applying to a base material by printing or coating using a stress luminescent ink, generally known methods such as intaglio, letterpress, offset, screen, gravure, flexographic printing, ink jet printing or coating can be used. Moreover, you may provide by the combination of these printing systems.

  For more effective authenticity determination, the stress-luminescent ink is suitable for application by intaglio printing or screen printing.

  Moreover, since the thick film is obtained by intaglio printing or screen printing, discrimination by tactile sensation can be performed simultaneously.

  The true / false discrimination printed matter of the first embodiment was printed on at least one surface of the substrate using a stress-stimulated luminescent ink containing a stress-stimulated luminescent material having both stress luminescence and electromagnetic wave luminescence properties as the first ink. The authenticity determination unit is formed by the first image region and the second image region printed using the electromagnetic wave light-emitting ink containing the electromagnetic wave light-emitting material having no stress light emission characteristic, which is the second ink. The first image region and the second image region may be formed so as to overlap at least partially, or may be formed without overlapping. Further, the second image area may be formed so as to cover the entire first image area. When the entire first image area is formed so as to be covered by the second image area, the second image area must always have a size having an area other than the first image area. . In other words, it must have an area of only the second image area.

  The stress-luminescent ink that is the first ink and the electromagnetic light-emitting ink that is the second ink may have the same spectral distribution or different colors. These can be appropriately selected depending on the discrimination method to be used.

  Further, the stress light emitting ink as the first ink and the electromagnetic light emitting ink as the second ink may contain a bright pigment or a color pigment having a color flip-flop property in addition to the light emitting material. By using these pigments, when observed under normal observation conditions, a luminescent image can be camouflaged by the coloring effect of the pigment.

  The authenticity determination printed material as the second embodiment is a printed material including the authenticity determination unit or the authenticity determination unit formed in the first image region and the second image region of the authenticity determination printed material of the first embodiment. The printed material is a true / false discrimination printed matter produced by further laminating the same kind or different kind of base material as the base material.

Examples of the same type of substrate include papers, and examples of different types of substrates include a paper substrate and a transparent substrate such as a laminate film.
As lamination of the same kind of base material, when observed with transmitted light, the first image region and the second image region are given to the base material having a grayscale image due to the difference in density or thickness of the base material composition, The same kind of base material is laminated so as to include the first image region and the second image region, and bonded and bonded together to produce an authenticity printed matter.

  In order to laminate and bond substrates together, an adhesive is applied to the stress-stimulated luminescent ink that is the first ink that forms the first image region and the electromagnetic luminescent ink that is the second ink that forms the second image region. May be used in combination. Moreover, you may apply | coat an adhesive agent to the whole base material including 1st image area | region and 2nd image area | region, and base material parts other than those image areas.

  As the lamination of the different kinds of base materials, the first image region and the second image region are provided on the surface of the paper base material, and the first image region and the second image region are attached to the transparent base material such as a laminate film. It is laminated so as to include it, and it is bonded to produce an authenticity printed matter.

When laminating and adhering the whole base materials, an adhesive is applied to the entire surface of either the base material or the base materials to be laminated, and then the first image region is formed on the other base material. An adhesive having different adhesive characteristics from the adhesive used for one of the substrates described above is applied to the stress-luminescent ink that is the first ink and / or the electromagnetic light-emitting ink that is the second ink that forms the second image region. A true / false discrimination part is formed by mixing. By adopting such a configuration, the first image area and / or the second image area is laminated on the surface of the base material, and when the adhesive base material is peeled off and modified, By providing the image region and / or the second image region part with special peeling characteristics different from those of the other parts, it is possible to prevent alteration.
As another aspect, the first image area and the second image with the first ink in the present invention are added to the nonwoven fabric which is the intermediate layer of the multilayer laminated paper according to Japanese Patent Application Laid-Open No. 2001-199072 filed by the present applicant. It is also possible to print the second image area with the ink.

An authenticity determination method for authenticity determination printed matter according to an embodiment of the present invention will be described.
(Description of principle)
The principle that stress-stimulated ink applied to a substrate by printing or coating emits light is that the whole shape is distorted when externally applied force (energy) such as pressure, shear, friction, etc. is applied to ordered molecules. When it is released from the state and returned to its original state, the extra energy given is released at once and emits light.

  In this embodiment, since the stress luminescent ink is printed or coated with a stress luminescent ink containing a stress luminescent material that emits light when stress is applied, the stress luminescent ink application portion emits light according to this stress. Even if stress is applied to other portions, no change occurs. This is a true / false discrimination method by discriminating the stress emission. For example, the emission can be confirmed by visual observation, a sensor or the like (hereinafter referred to as “sensor” including all visual and mechanical sensors).

The authenticity determination method according to the third embodiment will be described.
The authenticity determination method according to Embodiment 3 irradiates the authenticity printed matter with electromagnetic waves and emits electromagnetic waves as the first image area and the second ink printed using the stress-luminescent ink as the first ink. The light emission from the image area formed from the second image area printed with ink is read. This is the first emission image. Thereafter, in a state where the luminescent material is activated by electromagnetic wave irradiation, stress is applied to the authenticity determination printed matter in the dark field to confirm the luminescent image. This is the second light emission image. The first light emission image and the second light emission image are compared, and authenticity is determined based on the difference.

Next, the authenticity determination method according to the fourth embodiment will be described.
In the authenticity determination method of the fourth embodiment, the authenticity determination printed matter is irradiated with electromagnetic waves, and stress is applied to the authenticity determination printed matter in a state in which the luminescent material is activated by the electromagnetic wave irradiation. The light emission of the second image area is read by a sensor, and authenticity determination is performed based on the light emission intensity difference between the read first image area and the second image area. When reading the image area, the entire image may be read, or an arbitrary part may be read.

  The stress applying means may be a finger, but a simple tool such as a pen nearby may be used. It is possible to emit light with low stress by exposing it to electromagnetic waves before the step of applying stress.

  In the case of the stress-luminescent ink produced using the first ink, the stress-luminescent material having both the properties of stress luminescence and phosphorescence, the phosphorescence intensity attenuates with time change after excitation. However, the light emission intensity of the stressed pattern portion is temporarily increased, and the second ink is differentiated from the case of only the phosphorescent ink having no stress light emission.

  If the stress-stimulated luminescent material has strong phosphorescence, the stress-stimulated ink application part in the dark field after exposing the printed surface of the authenticity discrimination printed matter to a general light source such as natural light, indoor lighting or white LED as electromagnetic wave irradiation In addition, by confirming the change in the light emission intensity by applying a stress, it is possible to determine the authenticity of the printed material with a low stress.

  When the first image area is formed using a stress-stimulated luminescent ink produced using a stress-stimulated luminescent material that is extremely weak in fluorescence emission due to irradiation of electromagnetic waves, etc., the first image area is displayed during irradiation of electromagnetic waves. It is difficult to recognize, and mainly recognizes the second image area by the electromagnetic fluorescent ink. Therefore, it can be camouflaged that the stress-luminescent ink is applied as an anti-counterfeiting element. Thereafter, the image is read without irradiating the electromagnetic wave, and the stress is further applied to increase the light emission intensity of the stress light emission image, and the authenticity determination can be performed.

Examples of the above embodiment will be described below in detail with reference to the drawings. However, the present invention is not limited only to this embodiment.
FIG. 1 shows an example of a schematic configuration diagram of a machine discrimination device used for true / false discrimination of a true / false discrimination printed matter in the embodiment. The electromagnetic wave irradiation unit 3, the stress applying unit 4 for applying stress, and the stress applying surface applied by the stress applying unit 4 to the printed matter for authenticity determination are configured as the reading unit 6 for observing or reading the stress emission. The stress applying unit 4 may be controlled by the stress control unit 5, and the reading unit 6 may include a signal amplification unit 7 that amplifies light emission due to stress, a calculation unit 8, and a true / false determination unit 9. The signal amplification unit 7 may not be provided depending on the sensitivity, and the calculation unit 8 may not be provided depending on the sensor.

The stress-stimulated luminescent material used in the present example has both the properties of electromagnetic emission and stress luminescence that emit phosphorescence by excitation of electromagnetic waves with relatively low energy in the visible range used in the embodiment. A material having a composition of SrAl ₂ O ₄ : Eu _, Dy was used.

(Example 1)
FIG. 2 shows an example of the authenticity determination printed matter and the authenticity determination method of the first embodiment. An electromagnetic wave excitation light-emitting ink image 10 is formed by intaglio printing using phosphorescent intaglio ink as a second ink on a substrate, and then the first ink is at least partially overlapped with the electromagnetic wave excitation light emission ink image 10. The stress luminescent ink image 2 was formed by intaglio printing using the stress luminescent intaglio ink, and the other print areas were printed by a normal printing method to produce a true / false discrimination printed matter 1.

The first ink, the stress light-emitting intaglio ink, was blended as follows.
Stress light emitting material 10-50% by weight
Extender 10 to 40% by weight
Varnish 50-60% by weight
Auxiliary agent 1-5% by weight

A phosphorescent intaglio ink using a phosphorescent material having no stress luminescence as the second ink was blended as follows.
Phosphorescent material 10-50% by weight
Extender 10 to 40% by weight
Varnish 50-60% by weight
Auxiliary agent 1-5% by weight

  Since the authenticity printed matter 1 is produced by intaglio printing, the shape of the stress light-emitting intaglio ink image portion and the phosphorescent intaglio printing ink image portion can be sensed by tactile sensation when touched by hand, so it is easy It is possible to discriminate true / false discrimination printed matter.

Next, authenticity determination is performed on the produced authenticity determination printed matter 1 using the authenticity determination device of FIG. FIG. 2 (a) shows the state before applying stress, and FIG. 2 (b) shows the state after applying stress. The authenticity discrimination printed matter 1 is irradiated with an electromagnetic wave by the electromagnetic wave irradiation unit 3, and the generated electromagnetic wave emission pattern is read by the reading unit 6 to be a first emission image 11 (FIG. 2 (a)). Next, a stress light emission pattern generated by applying stress to the authenticity determination printed matter 1 from the stress applying unit 4 in a state where the light emitting material is activated by electromagnetic wave irradiation is observed on the reading unit 6 using a CCD camera. It reads as the 2nd light emission image 12 (FIG.2 (b)). At this time, if the reading unit 6 is a photosensor, the electromagnetic emission pattern can be read as the first emission intensity pattern 13 and the stress emission pattern can be read as the second emission intensity pattern 14.
As a method of applying stress by the stress applying unit 4, for example, an object having a shape as shown in the figure is brought into close contact with a printed matter and moved so as to rub in a certain direction to emit light.

  The authenticity determination unit 9 compares the first light emission image 11 by electromagnetic wave irradiation and the second light emission image 12 by stress application, or compares the first light emission intensity pattern 13 and the second light emission intensity pattern 14, and according to the applied stress. Thus, when a predetermined difference is recognized, it is determined to be genuine. At this time, a threshold for the amount of change may be provided by the calculation unit 8. Moreover, you may observe stress light emission visually visually.

  When discriminating the authenticity printed matter in a dark place, irradiate the authenticity printed matter with a room light or a general white LED, confirm the phosphorescence emission of the stress emission image and the electromagnetic emission image, and then apply the stress. Then, since it can confirm that only the application | coating part of stress luminescent ink emits light, a forgery can be distinguished easily.

(Example 2)
FIG. 3 shows an example of the authenticity determination printed matter and the authenticity determination method of the second embodiment. On the base material, a stress luminescence ink image 2 is printed by intaglio printing using a stress luminescence intaglio ink as a first ink, and an electromagnetic wave excitation luminescence ink image 10 is printed by screen printing using a phosphorescent screen ink as a second ink. Then, the other printed area was printed by a normal printing method to produce a true / false discrimination printed matter 1.

  Next, authenticity determination is performed on the produced authenticity determination printed matter 1 using the authenticity determination device of FIG. FIG. 3 (a) shows the state before applying stress, and FIG. 3 (b) shows the state after applying stress. An electromagnetic wave irradiation unit 3 irradiates the authenticity determination printed matter 1 with the electromagnetic wave irradiation unit 3 (FIG. 3A), and then a stress emission pattern generated by applying stress to the authenticity determination printed matter 1 from the stress applying unit 4 is read by the reading unit. 6 (FIG. 3B), the stress-stimulated luminescent ink image 2 can be read as the second luminescent intensity pattern 14, and the electromagnetic wave-excited luminescent ink image 10 can be read as the third luminescent intensity pattern 14 ′.

  The authenticity determination unit 9 compares the read third light emission intensity pattern 14 ′ with the second light emission intensity pattern 14, and determines that a genuine difference is recognized when a predetermined difference is recognized in the light emission intensity difference. At this time, it is possible to directly compare the luminescence intensity after the stress application of the stress luminescent ink image 2 and the electromagnetic wave excitation luminescent ink image 10, or before and after the stress application of the stress luminescent ink image 2 and the electromagnetic wave excitation luminescent ink image 10. The difference in emission intensity may be compared.

  It can also be discriminated by the limited emission intensity by controlling the mechanically applied stress. That is, it is possible to make a determination by providing a threshold value with respect to the emission intensity itself or the amount of change in the emission intensity.

(Example 3)
FIG. 4 shows an example of the authenticity determination printed matter and the authenticity determination method of the third embodiment. A stress-luminescent ink used for screen printing was prepared and printed. In particular, it is an example in the case of using a stress-stimulated luminescent ink having a very weak fluorescent property due to irradiation of electromagnetic waves or the like, and the second ink is a screen ink of a fluorescent material having a weak phosphorescence property that emits ultraviolet light and visible light. did.

A stress-luminescent screen ink was formulated as follows.
Stress light emitting material 20-30% by weight
Varnish 70-80% by weight
Auxiliary agent 0.01 to 1% by weight

Next, a screen ink of a fluorescent material having a weak phosphorescence property that is UV-excited visible light emission was blended as follows.
Fluorescent material 20-30% by weight
Varnish 70-80% by weight
Auxiliary agent 0.01 to 1% by weight

  The stress luminescence ink image 2 is applied on the base material using the stress luminescence screen ink which is the first ink, and the stress luminescence ink image 2 is formed so as to cover the stress luminescence ink image 2 region. The second ink, UV-excited visible light-emitting fluorescent ink, was overcoated to form UV-excited visible light-emitting fluorescent ink image 10 ′, which was designated as authenticity printed matter 1. In addition, the luminescent colors of the two types of inks were different.

  Next, authenticity determination is performed on the produced authenticity determination printed matter 1 using the authenticity determination device of FIG. FIG. 4A shows a state before stress is applied, and FIG. 4B shows a state after stress is applied. An ultraviolet-excited visible-light-emitting fluorescent ink image 10 'overcoated with a UV lamp of the electromagnetic wave irradiation unit 3 is excited on the authenticity discrimination printed matter, and the first light-emitting image 11' is confirmed by causing visible light emission (FIG. 4 (a)). . The luminescent image portion emitted red light, which is the luminescent color of the fluorescent ink. At this time, the fluorescence emission of the stress luminescence ink image 2 cannot be confirmed, but after the electromagnetic wave irradiation is stopped, the phosphorescence emission of the stress luminescence ink image 2 portion can be confirmed. The stress was applied by the stress applying unit 4, and the light emission of the second light emitting image 12, which is the stress light emitting ink image 2, could be read by the reading unit 6 from the generated stress light emitting pattern (FIG. 4B).

Example 4
FIG. 5 shows an example of the authenticity determination printed matter and the authenticity determination method of the fourth embodiment. On the base material, the stress luminescence ink image 2 and the electromagnetic wave excitation luminescence ink image 10 which is the second ink are formed by intaglio printing using the stress luminescence intaglio ink as the first ink, and at least usually at any place. A functional ink image 15 printed using a functional material capable of providing an image that can be visually recognized in an observation environment was applied to produce a true / false discrimination printed matter 1. The functional ink image 15 is printed partially overlapping the stress-stimulated luminescent ink image 2.

  Next, authenticity determination is performed on the produced authenticity determination printed matter 1 using the authenticity determination device of FIG. FIG. 5A shows a state visually recognized in a normal observation environment, FIG. 5B shows a state before applying stress, and FIG. 5C shows a state after applying stress.

  When the authenticity determination printed matter 1 is read in a normal observation environment, only the functional ink image 15 is visually recognized and becomes a visual recognition pattern 16 (FIG. 5A). Next, when an electromagnetic wave is irradiated from the electromagnetic wave irradiation unit 3 and observed by the reading unit 6, the stress light emission ink image 2 and the electromagnetic wave emission pattern 11 of the electromagnetic wave excitation light emission ink image 10 can be confirmed (FIG. 5B). Furthermore, when stress is applied to the authenticity discrimination printed matter 1 at the stress portion 4, the stress luminescence pattern 12 of the stress luminescence ink image 2 can be confirmed by a sensor (FIG. 5 (c)).

  The functional ink may be mixed with stress luminescent ink or may be overprinted. The functional ink image 15 that can be visually recognized in a normal observation environment not only exhibits its own functionality but also serves as a camouflage for the stress-stimulated ink image 2. Further, by providing the functional ink image 15, the stress-stimulated luminescent ink image 2, and the electromagnetic wave-excited luminescent image 10 as in this embodiment, it is possible to determine the authenticity in three stages.

It is a figure which shows an example of the machine discrimination device of an Example. FIG. 6 is a diagram illustrating an example of a genuineness determination printed matter and a determination method according to the first exemplary embodiment. FIG. 10 is a diagram illustrating an example of a method of determining authenticity determination printed matter of Example 2. FIG. 9 is a diagram illustrating an example of a method for determining authenticity determination printed matter according to a third embodiment. FIG. 11 is a diagram illustrating an example of a method for determining authenticity determination printed matter of Example 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Authenticity discrimination | determination printed matter 2 Stress light emission ink image 3 Electromagnetic wave irradiation part 4 Stress provision part 5 Stress control part 6 Reading part 7 Signal amplification part 8 Calculation part 9 Authenticity determination part 10 Electromagnetic wave excitation light emission ink image 10 'Ultraviolet excitation visible light emission fluorescence Ink image 11 First emission image (electromagnetic wave emission pattern)
11 '1st light emission image (visible light emission pattern)
12 Second emission image (stress emission pattern)
13 First emission intensity pattern (electromagnetic wave emission pattern)
14 Second emission intensity pattern (stress emission ink image stress emission pattern)
14 '3rd light emission intensity pattern (electromagnetic wave excitation light emission ink image stress light emission pattern)
15 Functional ink image 16 Visual pattern

Claims (10)

On at least one surface of the substrate, on at least a portion of the surface, a first image region printed using a first ink containing a mechanoluminescent material, and a second containing a photoluminescent material A printed matter for authenticity determination, which has a second image area printed using the ink. The authenticity determination printed matter according to claim 1, wherein at least a part of the first image region and the second image region overlap or do not overlap. That at least a part of the first image area and the second image area overlaps is that at least a part of the second image area overlaps the first image area or the first area 3. The authenticity determination printed matter according to claim 2, wherein the second area covers the second image area, and the second image area includes at least an area other than the first image area. The authenticity printed matter according to claim 1, 2, or 3, wherein a base material of the same kind or different kind from the base material is laminated on the first image region and the second image region. 5. The authenticity discrimination printed material according to claim 1, wherein the mechanoluminescence material has both light emission due to stress and phosphorescence due to electromagnetic wave excitation. 6. The authenticity according to claim 1, 2, 3, 4 or 5, wherein the first ink and / or the second ink contains at least one of a color pigment, a glittering material, and an adhesive. Discrimination printed matter. The authenticity printed matter according to claim 1, 2, 3, 4, 5 or 6, wherein the first image region has a film thickness of the first ink of 20 µm or more. The first image area is characterized in that the first ink is solidified or fixed on a substrate by irradiation with an electron beam having an acceleration voltage of 30 to 200 kV. , 6 or 7 authenticity discrimination printed matter. 9. The method of determining authenticity determination printed matter according to claim 1, wherein a sensor reads a first light emission image generated by irradiating the authenticity determination printed matter with electromagnetic waves, and emits light by the electromagnetic wave irradiation. A step of reading a second light-emitting image generated by applying a stress to the authenticity printed matter with the material activated, and a first light-emitting image by the electromagnetic wave irradiation and a second light-emitting image by the stress application. An authenticity determination method for authenticity determination printed matter, wherein authenticity determination is performed by comparison. 9. The method of determining authenticity printed matter according to claim 1, wherein the authenticating printed matter is irradiated with an electromagnetic wave, and the light emitting material is activated by the electromagnetic wave. And applying a stress to the second image region, reading a light emission intensity of each of the first image region and the second image region that emit light by the applied stress with a sensor, and reading the first image region An authenticity determination method for authenticity determination printed matter, wherein authenticity determination is performed based on a difference in light emission intensity between the image area and the second image area.

Images