JP2005038144A - Method for discriminating authenticity deciding body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for discriminating an authenticity deciding body by using geometric optical characteristics. <P>SOLUTION: In this method for discriminating an authenticity deciding body, an authenticity deciding body A1 is structured of a continuous body consisting of almost linear and uniform micro-triangle pole-like prisms 3 made of a transparent resin material, and formed in parallel on a base, and fixed to an authenticating medium formed with a pictorial pattern for authentication. In this authenticity deciding body A1, a ridge line 3R of the vertical angle part of each of the micro-triangle pole-like prisms comes close to or comes into contact with the surface of the authenticating medium, and a surface other than the ridge line forms a space with the authentication medium. A discrimination tool B1 structured of the micro-triangle pole-like prisms 3 constituted in parallel of the material whose refractive index is substantially the same as that of the authenticity deciding body A1, and of the same shapes and dimensions is overlapped on the surface of the base, and observed from the right above. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for discriminating authenticity determination objects.

  In detail, authenticity of a new structure used for securities such as securities, stock certificates, gift certificates, gift certificates, credit cards, prepaid cards, various cards such as passports, ID cards, video software, PC software, etc. The present invention relates to a method for discriminating the effect.

  Conventionally, forgery prevention / authentication judgment such as securities, stock certificates, gift certificates, gift vouchers, credit cards, prepaid cards, various cards such as passports, ID cards, etc., video software, PC software authentication stickers, etc. Holograms have been used in many fields where functional addition is required because of their excellent design and the difficulty of forgery and alteration that cannot be duplicated even on a color copying machine.

  However, in recent years, clever counterfeit products have appeared in holograms, and there are cases in which true / false determinations cannot be made at first glance, and there is a need for authenticity determination bodies that can be easily determined visually.

  Therefore, a medium having optical characteristics can be considered as an authenticity determination body that does not use a hologram. Although Patent Document 1 is an optical security article, it has a complicated structure, and a manufactured product is considered to be expensive.

  Patent Document 2 describes a technique that can be referred to the manufacture of a true / false determination object, although it is not a technique related to the authenticity determination object with respect to the light diffusion sheet manufacturing technique.

  Therefore, the applicant of the present application has studied and proposed a true / false determination object according to Patent Document 3 in order to complete a simple structure authenticity determination object having an optical function.

The true / false determining body is a true / false determining body having a uniform minute triangular prism-like prism structure on a base material, and when used as an authentication medium, total reflection is caused at the prism structure interface depending on the viewing direction. It utilizes the phenomenon that occurs and does not occur. That is, when a pattern or the like is provided on the lower surface of the authenticity judgment body, a phenomenon occurs in which the pattern is totally reflected from a certain direction and the pattern cannot be seen, but is seen from a certain direction.
Japanese National Patent Publication No. 10-508549 JP-A-5-169015 Japanese Patent Application No. 2003-010580

  However, since the authenticity determination body proposed in Patent Document 3 uses total reflection of light, it is normal that the entire authentication medium cannot be observed at the same time, but it is also necessary to observe the entire image.

  Therefore, the present inventor has studied the discrimination method for confirming whether or not such a true / false determination body exhibits a predetermined effect, and has completed the present invention.

The first of the gist of the present invention is that the authenticity determination body A1 is observed from directly above by superimposing the base material surface of the [identification jig B1] on the base material surface of the [authentication determination object A1]. It is in the determination method of a determination object.
[Authentication determination body A1] Authentication in which an authentication pattern is formed by a connecting body made of a transparent resin material and formed in parallel on a substantially linear and uniform micro triangular prism. In the authenticity determination body fixed to the medium, the ridge line of the apex portion of the small triangular prism is close to or in contact with the authentication medium surface, and a surface other than the ridge line forms a space with the authentication medium. True / false judgment body.
[Determination Jig B1] On a base material made of a transparent resin material, uniform micro triangular prisms of the same shape and size made of a material having substantially the same refractive index as the authenticity determination body A1 are connected in parallel. A discriminating jig.

The second of the gist of the present invention is the authenticity of observing the authenticity determination body A2 from directly above with the base material surface of the [identification jig B2] overlapped with the base material surface of the [authentication determination object A2]. It is in the determination method of a determination object.
[Authenticity determination body A2] Authentication in which an authentication pattern is formed by a connecting body made of a transparent resin material and formed in parallel on a substantially linear and uniform micro triangular prism. In the authenticity determination body fixed to the medium, the ridgeline of the apex portion of the minute triangular prismatic prism and the two surfaces sandwiching the ridgeline are close to the authentication medium having a cross section of substantially the same shape through a thin layer gap. True / false judgment body.
[Determination Jig B2] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and dimensions with the material having substantially the same refractive index as the authenticity determination body A2 are connected in parallel. A discriminating jig.

The third of the gist of the present invention is that the authenticity determination body A3 is observed from directly above by superimposing the base material surface of the [determination jig B3] on the base material surface of the [authentication determination object A3]. It is in the determination method of a determination object.
[Authenticity determination body A3] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed of a coating made of a high-quality material is fixed to the authentication medium on which the authentication pattern is formed, the ridge line of the apex portion of the micro triangular prism is on the authentication medium surface. A true / false determining object characterized in that a space other than the ridge line is formed in proximity to or in contact with the authentication medium.
[Determination Jig B3] On a base material made of a transparent resin material, uniform micro triangular prisms of the same shape and size made of a material having substantially the same refractive index as the authenticity determination body A3 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A3 is formed on the prism surface.

The fourth of the gist of the present invention is that the authenticity determination body A4 is observed from directly above by overlapping the base material surface of the [identification jig B4] on the base material surface of the [authentication determination object A4]. It is in the determination method of a determination object.
[Authenticity determination body A4] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed of a coating made of a high-quality material is fixed to the authentication medium on which the authentication pattern is formed, the ridgeline and the ridgeline at the apex corner of the micro triangular prism are sandwiched between A true / false determination body characterized in that the surface is arranged in close proximity to an authentication medium having a cross section having substantially the same shape through a thin-layer gap.
[Determination Jig B4] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and size with a material having substantially the same refractive index as the authenticity determination body A4 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A4 is formed on the prism surface.

The fifth of the gist of the present invention is that the authenticity determination body A5 is observed from directly above by overlapping the base material surface of the [identification jig B5] on the base material surface of the [authentication determination object A5]. It is in the determination method of a determination object.
[Authenticity determination body A5] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed by forming a film made of a high-quality material is fixed to the authentication medium through a thin layer gap, the film surface made of a material having a refractive index higher than that of the prism resin material The authenticity determination body is characterized in that an authentication pattern is formed on.
[Determination Jig B5] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and dimensions with the material having substantially the same refractive index as the authenticity judgment body A5 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A5 is formed on the prism surface.

  As described above, according to the authenticity determination method of the present invention, the following effects can be obtained.

  Since the authenticity judgment object to be discriminated in the present invention utilizes the total reflection phenomenon of light, the authentication pattern can be seen or not visible depending on the viewing direction, and the correct overall state of the authentication medium can be seen at the same time. There is a difficult problem.

  However, as in the above solution, a true / false determining object is used when a triangular triangular prism connected body having the same configuration as that of a determination object is overlapped with a true / false determining object and observed from above. Alternatively, the entire authentication medium on the lower surface can be clearly observed.

  Before describing a specific embodiment of the present invention, an optical phenomenon used by a true / false determination object as a determination target of the present invention will be described with reference to FIGS. 11 and 12.

  In general, in a state where there are interfaces 3a and 3b between a certain medium 1 and another medium 2 having a higher refractive index than that of the medium 1 (see FIG. 11), the light L1 traveling from the medium 2 side to the medium 1 side with respect to the interface 3a It is known that when the incident angle θ1 is larger than a certain angle (critical angle θt), no light traveling toward the medium 1 side is generated and all is reflected.

  On the other hand, when the incident angle is θ3 smaller than the critical angle as in the case of the light L2, a part of the light proceeds to the medium 1 side and the remaining part is reflected to the medium 2 side. The ratio of the amount of light traveling to the medium 1 side and the amount of light reflected to the medium 2 side varies depending on the incident angle.

  In FIG. 12A, the incident light beam L3 is totally reflected because it is incident on the interface 3b at an angle θ4 that is equal to or larger than the critical angle θt.

  On the other hand, since the light ray L4 is incident on the interface 3a at an angle θ5 smaller than the critical angle θt, a part thereof proceeds to the medium 1 side and the remaining part is reflected to the medium 2 side.

  The light beam L5 in FIG. 12B is the same, and is incident on the interface 3 at an angle θ6 smaller than the critical angle θt, so that part of the light advances to the medium 1 side and the remaining part reflects to the medium 2 side. To do. On the other hand, the light ray L6 incident at a large angle θ7 is totally reflected.

  In FIG. 11, the critical angle θt is given by θt = arcsin (a / b). Here, a is the refractive index of the medium 1 and b is the refractive index of the medium 2.

  Accordingly, the critical angle θt decreases as the value of b increases with respect to a (the difference in refractive index increases). When b is smaller than a, total reflection does not occur.

  In one embodiment of the authenticity judgment object to be discriminated in the present invention, uniform micro triangular prisms made of a transparent material are arranged so as to be close to the authentication medium through a thin layer gap.

  When observing the first triangular prism, the result is as shown in FIG.

  FIG. 12A shows a case where the image is observed from the right direction, and FIG. 12B shows a case where the image is observed from the left direction.

  In FIG. 12A, light beams L3 and L4 are parallel light beams. Since the light ray L3 is totally reflected at the interface 3b, the pattern 8b on the authentication medium surface cannot be observed. However, since the light ray L4 is not totally reflected at the interface 3a, the pattern 8a can be observed.

  In the case of FIG. 12B as well, in the parallel rays L5 and L6, the ray L5 is not totally reflected at the interface 3b, so that the pattern 8b can be observed, but the ray L6 is totally reflected at the interface 3a. The pattern 8a cannot be observed.

  The authenticity judgment object to be discriminated in the present invention utilizes such a phenomenon, but the angle at which the total reflection of light occurs is small when the refractive index difference between the medium 1 and the medium 2 is large. Since total reflection occurs at the corners, the pattern change becomes clear.

  That is, it is possible to obtain an effect of changing the state of the pattern simply by changing the viewing angle at a small angle from the state of observing the authenticity determination body from the front. Incidentally, when the medium 1 is air (refractive index≈1) and the medium 2 is a resin material (refractive index = 1.4 to 1.6), the critical angle θt is 38.7 degrees to 45. It will be 6 degrees.

  The specific embodiments of the authenticity determination object to be discriminated in the present invention can be broadly divided into five types of embodiments, and will be sequentially described below with reference to the drawings.

  FIG. 1 shows the authenticity determination object A1 to be determined in the first embodiment of the present invention, FIG. 2 shows the determination method of the authenticity determination object A1, and FIG. 3 shows the truth to be determined in the second embodiment. FIG. 4 shows the determination method of the authenticity determination object A2, FIG. 5 shows the authenticity determination object A3 to be determined in the third embodiment, and FIG. 6 shows the authenticity determination object A3. FIG. 7 is a sectional view showing the authenticity determination object A4 to be determined in the fourth embodiment, and FIG. 8 is a sectional view showing the authenticity determination object A5 to be determined in the fifth embodiment. . FIG. 9 is a diagram showing a light reflection state when a high refractive index film is provided on the surface of a small triangular prism.

  As shown in FIG. 1, the authenticity determination body A1 determined in the first embodiment of the present invention is an authentication medium in which an authentication pattern 8 is formed by connecting parallel bodies of uniform micro triangular prisms 3 in parallel. Each ridge line 3 </ b> R of the apex portion is close to or in contact with the surface of the authentication medium 4 on 4, and the other surface portion is fixed to the authentication medium 4 through the space 6.

  Here, “adjacent” means close to each other, and even when the distance is maximum except for the contact state, the range is up to the pitch P of the minute triangular prisms.

  “Fixed” means that the relative positional relationship and the space interval between the authentication pattern 8 of the authentication medium 4 and each ridgeline 3R are not changed, and only the ridgeline 3R portion is included in the authentication medium 4. In addition to bonding, only the peripheral portion of the authenticity determination body may be attached with an adhesive, and the authentication pattern 8 portion may be fixed so as not to contact.

  In many cases, the small triangular prism 3 is formed on the surface of the transparent substrate 2, and the small triangular prism 3 itself is also formed of a transparent or colored transparent resin material. Here, “transparent” means transparency that allows the authentication medium 4 surface to be clearly seen through the triangular prism 3.

  The height h of the small triangular prism 3 is preferably about 1 μm to 200 μm, more preferably about 5 μm to 100 μm. If the thickness is 1 μm or less, a diffraction phenomenon occurs, and the effect is not displayed. If the thickness is 200 μm or more, the thickness is too thick for the authenticity determination body fixed to the authentication medium.

  The feature of the authenticity determination body A1 discriminated in the first embodiment of the present invention is that the ridgeline 3R of the apex portion of the minute triangular prismatic prism 3 is in proximity to or in contact with the authentication medium 4, Portions other than the apex portion are configured to face the authentication medium 4 via the space 6. Since the space 6 is between the minute triangular prismatic prism bodies, a minute triangular prismatic space is formed.

  An authentication pattern 8 is formed on the authentication medium 4 facing the small triangular prism 3.

  This authentication medium 4 may be transparent or opaque. In the case of being opaque, the authentication pattern 8 is naturally provided on the surface of the small triangular prism 3 surface.

  When the authentication medium 4 is a thin transparent substrate, the authentication pattern 8 may be any surface, but when the substrate is thicker than the prism height h, it is preferably on the prism surface side. .

  The authentication pattern 8 may be formed by printing a uniform pattern regardless of the prism shape, but when observed from one side of the authenticity determination object A1 and when observed from the other side It is possible to change and observe different patterns.

  When discriminating the authenticity determination body A1, as shown in FIG. 2, the determination jig B1 is overlapped on the authenticity determination body A1 in parallel and observed from directly above. The authenticity determination body A1 and the determination jig B1 may be slightly separated as long as the base material is kept in parallel, but in order to maintain the parallel relationship, it is easy to closely contact or place.

  The determination jig B1 is formed by arranging, on a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and dimensions and made of a material having substantially the same refractive index as the authenticity determination body A1. Are connected.

  Here, the “material having substantially the same refractive index” is most preferably the same material, but even if it is a different material, the optical refractive index of the microtriangular prism material of the authenticity determination body A1; If it is within the range of ± 0.1, there is no problem.

  Substantially the same substrate is preferable. In other words, it may be considered that it is composed of a micro triangular prism sheet substantially the same as the authenticity determination body A1.

  In such a configuration of the authenticity determination body A1 and the determination jig B1, a symmetrical optical system is configured via the two layers of the base material 2. When the layer configuration is symmetric with respect to the center of the parallel optical system, the light is transmitted at the same exit angle β on the other surface with respect to the incident angle α on one side of the optical system.

  That is, if the light is emitted at right angles to the authentication medium 4 when observed from directly above the authentication medium 4 through the discrimination jig B1, the reflected light R can be observed.

  “Directly above” means that the viewing angle with respect to the authentication medium 4 should be almost a right angle, but the authentication medium can be sufficiently observed even if the angle is slightly deviated (about ± 15 °).

  Further, it is not necessary that the relative positions (the relative positions of the ridgeline 3R) of the determination jig B1 and the true triangular prism A1 of the authenticity determination body A1 coincide.

  The authenticity determination object A2 to be determined in the second embodiment of the present invention similarly uses a connecting body in which uniform micro triangular prisms 3 are arranged in parallel as shown in FIG. There is a feature of using a configuration having substantially the same shape and facing each other.

  For this purpose, two connecting bodies of substantially triangular prisms 3 having substantially the same shape and size are prepared, and one of them is used as an authentication medium, and the two are reversed and overlapped with each other through a thin layer gap 7. However, the shape is not limited to the exact same shape, and is expressed as substantially the same shape.

  That is, when the authentication medium 4 is a paper base material or the like, the paper base material or the like is embossed using an embossing mold having the same shape as the connection body of the micro triangular prism 3 and the connection of the micro triangular prism 3 is connected thereto. The body may be superimposed.

  The thin-layer gap 7 forms an interface for total reflection, and may be a slight space that is several μm or less and does not cause interference.

  Normally, even if the same concave and convex shapes having a high degree of accuracy are overlapped, if they are not precisely polished, there are minute projections and the like, and a gap of about several μm is formed, so a thin layer of gap 7 is provided. No special ingenuity is required. However, the gap 7 may be provided by meshing with a fine granular material (a spherical spacer having a diameter of several μm or less, about 1 μm or more) used for the liquid crystal panel.

  An authentication pattern 8a is formed on one side of the ridge line 4R on the authentication medium 4 side, and an authentication pattern 8b is formed on the other side. Alternatively, different colors may be applied to one side and the other side, or a reflector may be formed.

  The different colors can be applied by using an ink jet printer so that the nozzles are directed in a direction perpendicular to the ridgeline 4R and the ink is ejected from a direction substantially parallel to the entire plane of the authentication medium 4. . On the other side, the authentication medium 4 is rotated 180 degrees to spray different colors in the same manner.

  Similarly, if the nozzle is scanned in a specific pattern shape, it can be easily understood that different patterns of the authentication pattern 8a and the authentication pattern 8b can be formed.

  As the determination jig B2, a material in which uniform microtriangular prisms having the same shape and size and made of substantially the same refractive index as the authenticity determination body A2 are connected in parallel is turned over and used.

  In such a configuration of the authenticity determination body A2 and the determination jig B2, a symmetrical optical system is configured via the two layers of the base material 2. The determination method is the same as in the first embodiment.

  As shown in FIG. 4, the authentication patterns 8a and 8b are on the slope, but unless they come close to the small triangular prism 3 and are reflected, the reflected light can be observed when viewed from directly above the authentication medium 4 through the discrimination jig B2. R can be observed.

  As shown in FIG. 5, the true / false determination object A3 to be discriminated in the third embodiment of the present invention similarly uses a connecting body in which uniform micro triangular prisms 3 are arranged in parallel. There is a feature that the film 9 made of a material having a refractive index in the range of about 1.8 to 2.6 and having a higher refractive index than that of the prism resin material is formed.

  The reason why the lower limit of the refractive index is set to 1.8 is that if the refractive index is lower than 1.8, the difference in refractive index from the small triangular prism prism that is a resin molding cannot be increased. Moreover, the reason why the upper limit is 2.6 is that a material that can be used and has high transparency is considered to be within this range.

  As such a material, a metal oxide, a metal sulfide, or the like can be used as described later. The coating can be formed by physical vapor deposition or chemical vapor deposition. The film thickness is preferably in the range of 50 nm to 1000 nm. Although the film thickness may be large, there is a problem that the manufacturing cost increases.

  Although not shown, a transparent layer made of a resin having a lower refractive index may be provided on the surface of the film 9 and adhered to the authentication medium via the transparent layer.

  The authentication medium 4 of the authenticity determination object A3 to be determined in the third embodiment of the present invention is a flat one as in the first embodiment. In this case, similarly to the first embodiment, the ridgeline 3R is fixed so as to be close to or in contact with the authentication medium 4 surface.

  The authentication pattern 8 provided on the authentication medium 4 is also formed in the same manner as in the first and second embodiments.

  As the determination jig B3, a material in which uniform micro triangular prisms having the same shape and size and made of substantially the same refractive index as the authenticity determination body A3 are connected in parallel is used. The film 9 is formed in the same manner.

  In such a configuration of the authenticity determination body A3 and the determination jig B3, a symmetrical optical system is configured via the two layers of the base material 2. The determination method is the same as in the first embodiment.

  As shown in FIG. 6, when the authentication patterns 8a and 8b are observed from directly above the authentication medium 4 through the discrimination jig B3, the reflected light R can be observed.

  The authentication medium 4 to be discriminated in the fourth embodiment of the present invention is assumed to have substantially the same shape as the micro triangular prism of the second embodiment as shown in FIG. The authentication pattern 8 provided on the authentication medium 4 is also formed in the same manner as in the first and second embodiments.

  A microtriangular prism made of only a prism and not formed of the coating 9 made of a material having a higher refractive index than that of the prism resin material may be superposed as in the second embodiment. It is necessary to provide a thin film gap between 9 and the triangular prism 3.

  The discrimination method of the fourth embodiment is the same as that of the first, second, or third embodiment, and is not shown. However, the discrimination jig is similarly composed of a triangular prism sheet having the same configuration as the authenticity determination body A4. This is determined by overlapping B4.

  As shown in FIG. 8, the true / false judgment object to be discriminated in the fifth embodiment of the present invention uses a connecting body in which micro triangular prisms 3 are arranged in parallel, and the micro triangle is the same as in the third and fourth embodiments. A film 9 made of a material having a refractive index in the range of about 1.8 to 2.6 and having a refractive index higher than that of the prism resin material is formed on the columnar prism surface. It is characterized in that it is directly formed on the surface of the film 9 made of a material having a high refractive index.

  For the formation of the authentication pattern 8 on the surface of the coating 9 of the minute triangular prism 3, the above-described forming method using an ink jet printer can be employed.

  A binder resin for an ink jet printer having a low refractive index is preferable because it is easy to totally reflect. Alternatively, a transparent layer made of a resin having a lower refractive index may be provided between the coating 9 and the authentication pattern 8.

  The discrimination method of the fifth embodiment is also the same as that of the first, second or third embodiment, and is not shown in the figure. The tool B5 is overlapped for discrimination.

  FIG. 9 shows a light reflection state when the high refractive index film 9 is provided on the surface of the minute triangular prism. This is a case where a coating 9 made of a material having a refractive index higher than that of the prism resin material having a refractive index in the range of about 1.8 to 2.6 is provided on the surface of the small triangular prism prism 3 made of plastic resin.

  Since the actual coating 9 is about 600 mm, it is not as thick as shown, but it is drawn thick for easy illustration.

  In this case, since the light ray L7 is not totally reflected at the interfaces 3a and 3b, the pattern 8b can be observed. On the other hand, since the light ray L8 is totally reflected at the interface 3d, an angle range in which the pattern 8a cannot be observed is generated. The pictures 8a and 8b are made of a resin having a small refractive index.

  Note that, at the interfaces 3a and 3b between the resin layer of the small triangular prism 3 and the coating 9, light travels from the side with a small refractive index to the side with a large refractive index, and thus total reflection does not occur.

  Total reflection occurs at the interface 3c or 3d between the film 9 and the ink resin of the pattern. The same applies to the case where the authentication medium surface is viewed through the air layer without directly printing the pattern 8 on the surface of the film 9.

  Next, the manufacturing method of the authenticity judgment object used as discrimination | determination object in this invention is demonstrated. The discriminating jig used in the discriminating method of the present invention is also composed of the prism portion of the authenticity judging body and is obtained by the same manufacturing method.

  FIG. 10 is a diagram showing an apparatus for manufacturing a triangular prism. The manufacturing process of the triangular prism is performed using a roll intaglio in which a concave portion of the triangular prism is formed. The filling step for filling the concave portion with the resin, the contacting step for bringing the resin into contact with the sheet base material, and curing the resin. It consists of a curing step, an adhesion step for closely adhering the resin and the sheet base material, and a peeling step for peeling the sheet base material from the intaglio roll.

  In the manufacturing apparatus of FIG. 10, 10 is a roll intaglio in which a concave portion of a triangular prism is formed, 11 is a recess of the roll intaglio, and 12 is a coating apparatus for applying an ionizing radiation curable resin liquid to the roll intaglio 10. , 13 is an ionizing radiation curable resin liquid, 2 is a sheet substrate, 14 is a solvent drying device, 15 and 16 are curing devices, 17 is a pressing roll that contacts the roll intaglio and presses the roll intaglio 10, and 18 is a feed roll. .

  In FIG. 10, the recesses 11 for forming the triangular prisms are illustrated so as to be orthogonal to the flow direction of the sheet base material 2, but may be formed parallel to the flow direction of the sheet base material 2. Be good.

  The filling step in the triangular prism manufacturing process is a step of rotating the roll intaglio 10 on which the triangular prism prism mold is formed, and filling the ionizing radiation curable resin liquid 13 into at least the recess 11 of the roll intaglio 10.

  The contact step is a step of bringing the sheet base material 2 that travels in synchronization with the rotation direction of the roll intaglio 10 against the ionizing radiation curable resin liquid 13 filled in the filling step.

  In the curing step, the ionizing radiation from the curing device 15 is applied to the ionizing radiation curable resin liquid 13 between the roll intaglio 10 and the sheet base 2 while the sheet base 2 is in contact with the roll intaglio 10 in the contact step. Is a step of curing by irradiation.

  The adhesion process is a process in which the ionizing radiation curable resin liquid 13 cured in the curing process and the sheet substrate 2 are adhered to each other. The curing process and the adhesion process usually proceed simultaneously.

  The peeling process is a process of peeling the semi-cured product 13 a of the ionizing radiation curable resin liquid 13 and the sheet base material 2 that are adhered in the adhesion process from the roll intaglio 10.

  The roll intaglio 10 is a cylindrical plate material provided with a concave portion 11 having a predetermined shape. This roll intaglio can be produced by directly cutting the plate material with a lathe or the like, molding it by electroforming, or gravure plate making.

  The coating apparatus 12 is an apparatus for applying the ionizing radiation curable resin liquid 13 to the roll intaglio 10 and often uses a nozzle coating apparatus. In the nozzle coating apparatus, a nozzle having a predetermined size has a T-die-shaped rectangular or linear discharge port, the longitudinal direction of the discharge port is installed in a direction orthogonal to the roll intaglio rotation direction, The resin liquid is discharged only to a predetermined width portion of the entire width.

  The solvent drying device 14 is a device for volatilizing a resin solvent. As the solvent drying device 14, warm air, an infrared heater, or the like can be used. By providing this solvent drying device 14, a solvent-type resin can be used, and the range of selection of the resin to be used can be expanded. When the solventless ionizing radiation curable resin liquid 13 is used, the solvent drying device 14 is not used.

  The curing device 15 is a device that cures the ionizing radiation curable resin liquid 13 by irradiating with ionizing radiation. A curing device 16 may be provided in order to completely cure the semi-cured product 13a of the ionizing radiation curable resin liquid detached after the peeling step.

Here, the ionizing radiation means an electromagnetic wave or a charged particle beam having energy quanta capable of polymerizing and crosslinking molecules, and usually ultraviolet rays, electron beams and the like are used. In the case of ultraviolet rays as the curing devices 15 and 16, a light source of an ultrahigh pressure mercury lamp, a black light lamp, a xenon lamp, or a metal halide lamp can be used.
<Manufacture of triangular prisms>
In the manufacturing method of the prismatic prism by the above apparatus, first, the ion beam radiation curable resin liquid 13 is filled in the concave portion 11 of the roll intaglio 10 by the coating device 12, and the sheet base material 2 is filled in the concave portion 11 of the roll intaglio 10. It is made to contact so that it may adjoin to the ionizing radiation curable resin liquid 13 made.

  As a method of filling the concave portion 11 with the ionizing radiation curable resin liquid 13, a predetermined amount of the ionizing radiation curable resin liquid 13 is coated in advance on the surface of the roll intaglio 10, and the base sheet 2 is placed on the surface of the roll intaglio 10. When the pressure roller 7 is pressed, the coated ionizing radiation curable resin liquid 13 is distributed and filled in the recesses 11 through the base sheet by the pressing of the pressing roll 7.

  In this case, a solvent-type curable resin can also be used, and the ionizing radiation curable resin liquid 13 applied to the sheet substrate 2 is used to dilute the solvent of the resin liquid in order to control the fluidity to some extent. The solvent and the like used in the above are dried and removed by the solvent drying device 14, and the resin liquid obtained by drying the solvent by the curing device 15 is semi-cured.

  While the sheet substrate 2 is in contact with the roll intaglio 10, the ionizing radiation curable resin liquid 13 is cured by the curing device 15. If necessary, a plurality of curing devices can be provided along the rotation direction of the roll intaglio. Curing of the cured product, curling of the sheet substrate 2 and the like can be reduced by multi-stage curing.

  Alternatively, the roll intaglio 10 may be formed of a material having good ionizing radiation permeability, such as quartz or glass, and irradiated from the inside of the roll intaglio 10.

The ionizing radiation curable resin liquid 13 in the recess 11 of the roll intaglio 10 is brought into close contact with the sheet substrate 2 by the curing device 15. At this time, the degree of curing may be such that at least the fluidity of the resin is lost and the adhesiveness with the sheet substrate 2 is caused. After passing through the curing device 15, the sheet substrate 2 is peeled from the roll intaglio 10. Thereby, the authenticity determination body sheet | seat which has the surface by which the semicured ionizing-radiation-curable resin liquid 13a was united with the sheet | seat base material 2, and was detach | desorbed from the recessed part 11, and was made into the prism is obtained.
<Embodiment related to material>
(1) Sheet base material As the base material, a highly transparent polymer film is preferable from the viewpoint of processability.

  The plastics for the polymer film are polyethylene resin, polypropylene resin, polymethylpentene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, vinyl chloride-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin. , Ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, polymethyl methacrylate resin, polycarbonate resin, polyarylate resin, polyimide resin, polysulfone resin, acrylic resin, etc. Can be used. A liquid crystal material can also be used.

The thickness of the substrate is preferably in the range of about 12 to 150 μm from the viewpoint of ease of processing.
(2) Triangular prismatic prism body The material of the prism body is not particularly limited, but a resin material is preferable from the viewpoint of processability. Moreover, it is calculated | required that it is transparent or colored transparent from a prism characteristic.

  In the above-described manufacturing method of forming a prism shape with an ultraviolet curable resin, an ultraviolet curable ionizing radiation curable resin liquid is preferably used.

  As a specific example of such a resin liquid, a composition in which prepolymers, oligomers and / or monomers having a polymerizable unsaturated bond or an epoxy group in the molecule are appropriately mixed can be used.

  Examples of the prepolymer and oligomer include unsaturated polyesters such as a condensate of unsaturated dicarboxylic acid and multi-valued alcohol, epoxy resins, polyester methacrylate, polyether methacrylate, polyol methacrylate, methacrylates such as melamine methacrylate, polyester acrylate, epoxy Examples include acrylates such as acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate.

  Examples of the monomer include styrene monomers such as styrene and α-methylstyrene, acrylic acid esters such as methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, and butyl acrylate, and methacrylic acid. Methacrylates such as methyl acetate, ethyl methacrylate, methoxyethyl methacrylate, methoxymethyl methacrylate, unsaturated substituted amino alcohol esters such as acrylic acid-2- (N, N-diethylamino) ethyl, acrylamide, methacryl Unsaturated carboxylic acid amides such as amides, polyfunctional compounds such as dipropylene glycol diacrylate, ethylene glycol acrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate, vinyl pyrrolidone, and / or molecules Polythiol compounds having two or more thiol groups, such as trimethylolpropane trithioglycolate, trimethylolpropane tri thio propylate, pentaerythritol thioglycolate and the like.

  In particular, in the case of curing by ultraviolet rays, as a photopolymerization initiator in the composition of the ionizing radiation curable resin, acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylmeurum monosulfide, As a thioxanthone and / or a photosensitizer, n-butylamine, triethylamine, tri-n-butylphosphine, or the like can be mixed and used. Further, in order to faithfully reproduce the shape of the roll intaglio 10 having the fine concave portion 11 of the prism, the viscosity is preferably 5000 cps or less, particularly 1000 cps or less. When the prism is colored and transparent, a dye that does not inhibit curing may be added.

  For reference, the refractive indexes of various polymer resins are exemplified below.

  Various polymer resins have a refractive index of 1.4 to 1.6.

Polybutyl acrylate (1.44), polyethyl acrylate (1.47), polymethyl acrylate (1.47), poly n-butyl methacrylate (1.48), polymethyl methacrylate (1.49), polyvinyl acetate (1.47), polypropylene (1.49 to 1.50), polyethylene (1.5 to 1.55), polycarbonate (1.58), polystyrene (1.59 to 1.60), polyethylene terephthalate (1 .64), polyvinyl chloride (1.54), polyvinylidene chloride (1.60 to 1.63), and the like.
(3) Material having a higher refractive index than the prism resin material There are various materials, but transparent materials include metal oxides, sulfides, fluorides, etc., and these refractive indexes are 1.5. It will be about 2.7.

Fe ₂ O ₃ (2.7), PbO (2.6), CdS (2.6), Cr ₂ O ₃ (2.3), TiO ₂ (2.3), ZnS (2.1), ZnO (2.1), SiO (2.0), Sb ₂ O ₃ (2.0), WO ₃ (2.0), ZrO ₂ (2.0), In ₂ O ₃ (2.0), TiO (1.9), Si ₂ O ₃ (1.9), PbF ₂ (1.8), Cd ₂ O ₃ (1.8), MgO (1.7), Al ₂ O ₃ (1.6) , SiO ₂ (1.5), etc.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  By a method of curing a urethane acrylate-based ultraviolet curable resin liquid on a polyethylene terephthalate film (PET) substrate 2 having a thickness of 100 μm, a height of 80 μm and a base length (pitch P) of 160 μm as shown in FIG. A connecting body of minute right-angled isosceles triangular prisms 3 was formed in a size of 2 cm × 2 cm.

  On the other hand, on the surface of the authentication medium 4 made of a hard vinyl chloride substrate, a different authentication pattern 8a and authentication pattern 8b were printed with a width of 70 μm and a size of 2 cm × 2 cm with a pitch of 160 μm. For printing, an ink jet printer using a microcapillary array and a precision printing method in which a voltage was applied using conductive ink were used.

  The authentication medium 4 and the minute isosceles triangular prism 3 are aligned, and the ridgeline 3R of the prism is aligned and closely contacted so that the authentication pattern 8a and the authentication pattern 8b on the authentication medium 4 surface are correctly in the middle. An adhesive was applied to the peripheral portion of the connecting body of the triangular prism 3 and a width of 0.4 mm, and the adhesive was adhered and fixed. Thus, the authenticity determination body A1 as shown in FIG. 1 was completed.

  The connecting body of the micro right-angled isosceles triangular prism 3 formed on the PET substrate 2 having a thickness of 100 μm and having a height of 80 μm and a base length (pitch P) of 160 μm is determined by measuring 2 cm × 2 cm. A jig B1 was obtained.

  The discrimination jig B1 is superimposed on the authenticity determination body A1 as shown in FIG. 2 so that the base materials 2 are in contact with each other, and when viewed from directly above, the entire pattern of the authenticity determination body A1 is clearly shown. I was able to observe.

  By a method of curing a urethane acrylate-based UV curable resin liquid on a PET substrate 2 having a thickness of 100 μm, as shown in FIG. 3, a fine right isosceles with a height of 100 μm and a base length (pitch P) of 200 μm. Two connecting bodies of triangular prisms 3 were formed in a size of 2 cm × 2 cm.

  The inclined surface of one prism of the connecting body of the micro right angled isosceles triangular prism 3 is printed with jet print ink containing a red sublimation dye, and the other inclined surface is printed with jet print ink containing a blue sublimation dye. Printed.

  An authentication medium 4 composed of the printed micro right-angle isosceles triangular prism prism and a non-printed micro right-angle isosceles triangular prism prism 3 connected to each other, and the ridge line 3R of the triangular prism prism is located at the valley on the authentication medium 4 side. , The authenticity determination body A2 as shown in FIG. 3 was obtained by superimposing them.

  The connecting body of the micro right-angled isosceles triangular prism 3 formed on the PET substrate 2 having a thickness of 100 μm and having a height of 100 μm and a base length (pitch P) of 200 μm is determined to have a size of 2 cm × 2 cm. A jig B2 was obtained.

  When this discrimination jig B2 is overlaid on the authenticity determination body A2 so that the base materials 2 are in contact with each other as shown in FIG. 4, the whole picture of the authenticity determination body A2 can be clearly seen when observed from directly above. I was able to observe.

  By connecting a urethane acrylate UV curable resin liquid onto a PET substrate 2 having a thickness of 100 μm, a continuous isosceles triangular prism 3 having a height of 60 μm and a base length of 120 μm as shown in FIG. One body was formed in a size of 2 cm × 2 cm.

Then, after depositing a film 9 to a thickness of 60 nm on a prism surface using titanium oxide (TiO ₂ ) having a refractive index of 2.6 as a deposition source, 1 of the connecting body of the minute isosceles triangular prism 3 as in the second embodiment. Printing was performed with jet print ink containing a red sublimation dye on the inclined surface of each prism on one side, and jet print ink containing a blue sublimation dye was printed on the other inclined surface.

  Thereby, the authenticity determination body A3 as shown in FIG. 5 was obtained.

The connecting body of the micro right-angled isosceles triangular prism 3 having a height of 60 μm and a base length (pitch P) of 120 μm formed on the PET substrate 2 having a thickness of 100 μm (having a refractive index of 2.6 on the surface of the prism 3). Titanium oxide (TiO ₂ ) as a deposition source and a film 9 deposited to a thickness of 60 nm) was made 2 cm × 2 cm in size and used as a discrimination jig B3.

  This discrimination jig B3 is superimposed on the authenticity determination body A3 so that the base materials 2 are in contact with each other as shown in FIG. 6, and when viewed from directly above, the whole picture of the authenticity determination body A3 is clearly shown. I was able to observe.

It is sectional drawing which shows the authenticity determination body A1 used as discrimination | determination object in 1st Embodiment of this invention. It is sectional drawing which shows the discrimination method of the same authenticity determination body A1. It is sectional drawing which shows the authenticity determination body A2 used as discrimination | determination object in the 2nd Embodiment. It is sectional drawing which shows the discriminating method of the same authenticity determination object A2. It is sectional drawing which shows the authenticity determination body used as discrimination | determination object A3 in the 3rd embodiment. It is sectional drawing which shows the discrimination method of the same authenticity determination object A3. It is sectional drawing which shows the authenticity determination body A4 used as discrimination | determination object in the 4th Embodiment. It is sectional drawing which shows the authenticity determination body A5 used as discrimination | determination object in the said 5th Embodiment. It is a figure which shows the reflective state of the light at the time of providing a high refractive index film | membrane on the surface of a micro triangular prism. It is a figure which shows the manufacturing apparatus of a triangular prism prism. It is a figure explaining the optical phenomenon which this invention utilizes. It is a figure explaining the optical phenomenon which this invention utilizes.

Explanation of symbols

A1, A2, A3, A4, A5 Authenticity judgment body B1, B2, B3, B4, B5 Discriminating tool 2 Base material, sheet base material 3 Triangular prism 3a, 3b, 3c, 3d Interface 3R Ridge line 4 Authentication medium 4R Ridge line 6 space 7 thin layer gap 8 authentication pattern 8a, 8b authentication pattern 9 coating 10 roll intaglio 11 recess 12 coating device 13 ionizing radiation curable resin liquid 14 solvent drying device 15, 16 curing device 17 pressure roll 18 feed roll

Claims (9)

A method for discriminating a true / false determination body, in which the base material surface of [discriminating jig B1] is overlapped on the base material surface of [authentication determination body A1] and the authenticity determination body A1 is observed from directly above.
[Authentication determination body A1] Authentication in which an authentication pattern is formed by a connecting body made of a transparent resin material and formed in parallel on a substantially linear and uniform micro triangular prism. In the authenticity determination body fixed to the medium, the ridge line of the apex portion of the small triangular prism is close to or in contact with the authentication medium surface, and a surface other than the ridge line forms a space with the authentication medium. True / false judgment body.
[Determination Jig B1] On a base material made of a transparent resin material, uniform micro triangular prisms of the same shape and size made of a material having substantially the same refractive index as the authenticity determination body A1 are connected in parallel. A discriminating jig. A method for discriminating a true / false determination body, in which the base material surface of [discriminating jig B2] is overlapped on the base material surface of [authentication determination body A2] and the authenticity determination body A2 is observed from directly above.
[Authenticity determination body A2] Authentication in which an authentication pattern is formed by a connecting body made of a transparent resin material and formed in parallel on a substantially linear and uniform micro triangular prism. In the authenticity determination body fixed to the medium, the ridgeline of the apex portion of the minute triangular prismatic prism and the two surfaces sandwiching the ridgeline are close to the authentication medium having a cross section of substantially the same shape through a thin layer gap. True / false judgment body.
[Determination Jig B2] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and dimensions with the material having substantially the same refractive index as the authenticity determination body A2 are connected in parallel. A discriminating jig. A method for discriminating a true / false determination object, in which the authenticity determination object A3 is observed from directly above with the base material surface of the [discrimination jig B3] overlapped with the base material surface of the [authentication determination object A3].
[Authenticity determination body A3] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed of a coating made of a high-quality material is fixed to the authentication medium on which the authentication pattern is formed, the ridge line of the apex portion of the micro triangular prism is on the authentication medium surface. A true / false determining object characterized in that a space other than the ridge line is formed in proximity to or in contact with the authentication medium.
[Determination Jig B3] On a base material made of a transparent resin material, uniform micro triangular prisms of the same shape and size made of a material having substantially the same refractive index as the authenticity determination body A3 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A3 is formed on the prism surface. A method for discriminating a true / false determination body, in which the base material surface of [Determination Jig B4] is overlapped on the base material surface of [Authenticity determination body A4] and the authenticity determination body A4 is observed from directly above.
[Authenticity determination body A4] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed of a coating made of a high-quality material is fixed to the authentication medium on which the authentication pattern is formed, the ridgeline and the ridgeline at the apex corner of the micro triangular prism are sandwiched between A true / false determination body characterized in that the surface is arranged in close proximity to an authentication medium having a cross section having substantially the same shape through a thin-layer gap.
[Determination Jig B4] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and size with a material having substantially the same refractive index as the authenticity determination body A4 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A4 is formed on the prism surface. A method for discriminating a true / false determination object, in which the authenticity determination object A5 is observed from directly above with the base material surface of the [discriminating jig B5] overlapped with the base material surface of the [authentication determination object A5].
[Authenticity determination body A5] A substantially straight and uniform micro triangular prism formed of a transparent resin material on a base material is arranged in parallel, and the refractive index of the prism surface is higher than that of the prism resin material. In the authenticity determination body in which the connecting body formed by forming a film made of a high-quality material is fixed to the authentication medium through a thin layer gap, the film surface made of a material having a refractive index higher than that of the prism resin material The authenticity determination body is characterized in that an authentication pattern is formed on.
[Determination Jig B5] On a base material made of a transparent resin material, uniform micro triangular prisms having the same shape and dimensions with the material having substantially the same refractive index as the authenticity judgment body A5 are connected in parallel. A discriminating jig in which a film made of a material having a refractive index higher than that of the prism resin material and substantially the same refractive index as the authenticity determination body A5 is formed on the prism surface. The micro triangular prism and the authentication medium are made of the same resin material, and the cross-section is substantially the same shape and size of the triangle, and the ridge line portion of the micro triangular prism is fitted in the recess of the authentication medium. 5. The authenticity determination method according to claim 2 or 4, wherein the determination method is fixed. 4. The authenticity determination method according to claim 1, wherein the authentication medium is made of a transparent base material, and an authentication pattern is formed on a side surface opposite to the surface of the small triangular prism. . 6. The authenticity judgment object discriminating method according to claim 1, wherein a cross section perpendicular to the length direction of the minute triangular prismatic prism is an isosceles triangle. 6. The authenticity determination method according to claim 1, wherein the height of the small triangular prisms is in the range of 1 [mu] m to 200 [mu] m.

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