JP2018183961A - Display body and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display body which increases design and forgery difficulty and a printed matter comprising the display body.SOLUTION: There is provided a display body comprising a space part shielded from outside and a structural interface of two different types of macrostructures, in which by arranging a patterned structure with which transparency is seen in a different manner according to a difference in a degree of inclination of a structure inclination of the macrostructure with respect to observation from a specific angle, it is possible to provide the display body having a unique visual effect and a high anti-forgery property.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display body and a printed matter provided with the display body. The present invention relates to a display medium for preventing counterfeiting and copying of security media such as banknotes, cards, and gift certificates, and official documents such as passports, and a printed matter including the display body.

  A technique called a watermark is used for securities such as banknotes and gift certificates, or public documents such as passports for the purpose of preventing forgery and imitation. Watermarking has long been known as a technique that allows a pattern such as a picture to be confirmed by adding light and shade depending on a change in the intensity of transmitted light when the object is observed through light.

  As a method of changing the intensity of transmitted light, there is a method of squeezing, in which the thickness of the paper is slightly changed when the paper is manufactured. Even now, watermarking technology is widely used as a means for preventing forgery. However, there is a risk that the paper is patterned with oil and the like, and at first glance, there is a risk of imitation that is mistaken for a watermark, and its anti-counterfeiting effect is not sufficient. Under such circumstances, various anti-counterfeiting techniques have been proposed that can confirm the effect by transmitting light through an object like a watermark.

  In patent document 1, the proposal which makes a pattern using liquid substances on base materials, such as a colorless and transparent film of a mat | matte (rough surface) surface state, is made | formed. This liquid substance is a colorless and transparent acrylic lacquer that penetrates into a rough surface and is dried. By making the light transmittance of this pattern portion greater than the light transmittance of other portions, a watermark pattern is obtained.

  Furthermore, in patent document 1, the multilayer interference film is provided by laminating | stacking the transparent thin film of an inorganic compound. When the reflected light is observed from the interference film side, an interference color shining in rainbow can be confirmed. The interference color is a color that changes by changing the observation angle. Further, when the transmitted light is observed from the side opposite to the interference film, the complementary color of the regular reflection light on the interference film side can be seen. In this way, the watermark pattern and the interference color flip-flop effect coexist.

  Patent Document 2 proposes a printed matter in which a pattern is printed with a line on either one of the front and back sides of a substrate, and the other is printed with a pattern consisting of an image line with a pattern to be a latent image on the other line. Yes. By seeing this printed matter through the light, it is possible to confirm a continuous tone image that appears by combining the front and back patterns.

  Patent Document 2 shows a printed matter in which a line pattern is printed on either the front or back side of a printing medium through which light is transmitted. On the other side of the printed material, the line arrangement is synchronized with the line arrangement of the one line pattern, and the same line width is perpendicular to the line arrangement of the one line. The pattern which has it is printed. Printing is performed by changing the pitch of the front and back line patterns by screen printing and aligning the front and back positions. In this way, when viewed through light, a printed matter is obtained in which the front and back patterns are combined and the latent image appears as a continuous tone image.

  Patent Document 3 proposes a printed matter using a creped paper having an uneven shape. The concavo-convex shape is formed by embossing a line pattern representing a pattern by partially varying the angle, or a relief pattern, or an image line configuration of either pattern. This creped paper is inclined with respect to the parts constituting the parts other than the concavo-convex pattern, with various lines drawn at regular intervals, using inks of colors other than the material color and colorless and transparent. Printed.

  In the printed matter of Patent Document 3, there is a non-constant positional relationship between the concavo-convex shape and the printed image line having a certain interval, and a specific character or pattern that becomes a latent image only when viewed from a certain angle. The effect that can be recognized is described. At the same time, in the case of creased paper, the effect that the creased image can be easily recognized by transmitted light is described.

Japanese Patent No. 2840724 Japanese Patent Publication No. 8-13568 Japanese Patent No. 2615401

  As a technique for confirming the effect by transmitting light like a watermark, proposals such as Patent Documents 1 to 3 described above have been made. In Patent Document 1, a coloring effect is obtained by interference of transmitted light by simply creating a watermark pattern and adding an interference multilayer film. However, if a transparent resin is dropped on a rough surface such as a general diffusion film, it can be easily imitated. In addition, the deposition of the multilayer film is a complicated process and requires labor and time.

  Further, in Patent Document 2, by performing screen printing on the front and back surfaces of the base material while aligning the positions, a grayscale image changed by printing when observing transmitted light is observed. However, large facilities and costs are required to accurately align double-sided printing. Moreover, the observed pattern is limited to a grayscale image similar to a normal watermark.

  In Patent Document 3, offset printing is performed on the inclined surface of the concavo-convex structure. However, it is necessary to perform the printing by inclining the base material, which involves a complicated process. In addition, printing on an inclined base material makes it difficult to control the printing position and the like, and there is a problem in productivity.

  The present invention has been made in view of the above-described conventional problems, and the problem to be solved by the present invention is to provide a display body with improved designability and counterfeiting difficulty, and a printed matter provided with the display body. There is.

The present invention has been made to solve these problems.
That is, the invention according to claim 1 is a display body in which at least a first base material, a structural layer provided on the first base material, and a second base material are provided in this order. The layer has a macro structure region having at least a first macro structure portion and a second macro structure portion on a surface opposite to the first base material side, and an outer peripheral portion adjacent to the macro structure region. In the macro structure region, only the top portion of the structural layer is in close contact with the second base material via an adhesive layer, and the outer peripheral portion of the second base material is the entire surface of the structural layer via an adhesive layer. In the structural layer, the region not in close contact with the second base material forms a space portion, and the first layer side when observed from a specific angle on the first base material side. In one macro structure portion, light totally reflected at the interface between the structure layer and the space portion is observed, In 2 macrostructure unit, a display body, wherein a light transmitted at the interface between the space portion and the structure layer is observed.

  The invention according to claim 2 is the display body according to claim 1, wherein the top portion includes a plane parallel to the second base material.

The invention according to claim 3 is the display body according to claim 1, wherein the display body according to claim 1 has a concavo-convex structure on the top part in contact with the adhesive layer or the side of the outer peripheral part in contact with the adhesive layer. is there.

  The invention according to claim 4 is characterized in that the adhesive layer is provided only in a portion where the structural layer and the second base material are in close contact with each other. The display body according to any one of the above.

  The invention according to claim 5 is the display body according to claim 4, wherein the adhesive layer includes scattering particles.

  The invention according to claim 6 is the display body according to any one of claims 1 to 5, wherein the first base material and the structural layer are brittlely peeled off.

  The invention according to claim 7 is a printed matter characterized in that the display body according to any one of claims 1 to 6 is provided.

  According to the present invention, a structure having different transparency at a specific observation angle is combined, and this is provided between two substrates together with a sealed space, so that the optical effect is high and no deterioration occurs. In addition, a display body excellent in anti-counterfeiting properties can be provided.

  This is because the refractive index difference at the structural interface that produces an optical effect due to the presence of the space can be increased, and the optical effect can be prevented from being deteriorated due to contamination of the structural interface by sealing this space and blocking it from the outside. It is. Furthermore, since the structure interface can be prevented from being traced by providing the structure interface inside, it has a high anti-counterfeiting property.

  In addition, the structural layer is bonded to the second base material via the adhesive layer. If the portion in contact with the adhesive layer, that is, the top of the structural layer is a plane parallel to the second base material, the structural layer and the second base material 2 Adhesive strength with a base material improves, and durability as a display body improves.

  Furthermore, by providing a concavo-convex structure at a portion where the structural layer and the adhesive layer are in contact, an anchor effect due to the structure is generated, and the adhesion between the structural layer and the second base material can be further improved.

  The display body of the present invention performs display using structures having different transparency, and includes an effect that the transparency changes depending on observation conditions such as an observation direction and an observation angle. However, the portion where the structural layer and the adhesive layer are in close contact with each other is a highly transparent region because the difference in refractive index between the materials is small and the optical effect of the structural interface hardly occurs. Regardless of the structure, that is, when it is desired to always provide a highly transparent region regardless of the observation conditions, the adhesive layer is printed with a pattern, and the printed part should be in close contact with the adhesive layer. realizable.

  In the case of performing display centering on the effect of the transparent portion due to the structure, the high transparency of the close contact portion between the structural layer and the adhesive layer causes a decrease in contrast. On the other hand, visual effects can be improved by adding scattering particles to the adhesive layer to suppress transparency. In this case, if the adhesive layer is provided on the entire surface, the effect of scattering is also exerted on the portion where the transparency is desired to be increased. Therefore, it is necessary to perform pattern printing that is not provided on this portion.

As an improvement in the anti-counterfeiting property, it is possible to prevent the shape of the structure interface from being traced by intentionally reducing the adhesion between the first base material and the structural layer or providing a brittle layer between the two layers. This is because when both the substrates are deliberately peeled in an attempt to expose the structural interface sandwiched between the first substrate and the second substrate, the first substrate and the structural layer are not the same. This is because part or all of the peeling occurs.

  Moreover, by providing the display body of the present invention on a printed material, it is possible to give the printed material a three-dimensional effect or enhance the design.

It is the top view which showed an example of the form of the display body in this invention. It is sectional drawing which showed an example of the form of the display body in this invention. It is a figure which shows an example of how the light advances in the 1st macro structure of the display body of this invention. It is a figure which shows an example of how the light advances in the 2nd macro structure of the display body of this invention. It is sectional drawing which showed the 2nd example of the form of the display body in this invention. It is sectional drawing which showed the 3rd example of the form of the display body in this invention. It is the top view which showed the 3rd example of the form of the display body in this invention. It is sectional drawing which showed the 4th example of the form of the display body in this invention. It is the conceptual diagram which showed the example of the method of providing an contact bonding layer in pattern shape. It is sectional drawing which showed the 5th example of the form of the display body in this invention. It is sectional drawing which showed the state when the display body of FIG. 10 was peeled.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings. Various forms described below are preferable specific examples of the present invention. Moreover, the same code | symbol is attached | subjected to the member which has the same or similar function, and the description is abbreviate | omitted.

  FIG. 1 is a plan view showing an example of a display body 1 according to the present invention. FIG. 2 is a diagram showing an example of a cross section taken along line XX ′ of FIG.

  In the display 1 shown in FIG. 1, a macro structure region 8 composed of a first macro structure 6 and a second macro structure 7 having different light transmission performance when observed from a specific angle is surrounded by an outer peripheral portion 9. Has been placed.

  As shown in FIG. 2, the two macro structures passing through the line XX ′ have prism shapes and have different inclination angles. The difference in the inclination angle causes a difference in the way the light travels, and the transparency changes depending on whether scattering occurs due to total reflection or transmission.

  The macro structure is formed in the structural layer 3, which is formed on the first substrate 2. The structural layer 3 can be provided directly on the first substrate 2, but an anchor layer or a brittle layer may be provided therebetween. The macro structure region 8 is formed on the surface opposite to the surface in contact with the first base material of the structure layer 3 and is surrounded by the outer peripheral portion 9 having a flat structure.

  The size of the macro structure is preferably about 1 to 20 μm in depth and about 1 to 100 μm in pitch. If the depth is smaller than this, it is difficult to produce a structure with high accuracy. If the depth is larger than this, the structural layer becomes thick, and it becomes impossible to cope with the thinness required for the display body. Also, regarding the pitch, if the pitch is smaller than this, the effect of diffraction is increased, and the expressive power of transparency, which is the original purpose of the display body, is reduced. This is because it becomes conspicuous.

As the material of the structural layer 3, a resin having a visible light wavelength transparency can be used. For example, a resin having visible light transparency such as acrylic, polycarbonate, epoxy, polyethylene, and polypropylene can be used. Among them, for example, when a thermoplastic resin or a photocurable resin is used, a structure layer having the structure can be easily produced by transfer using an original plate on which an arbitrary macro structure is formed.

  The side of the structural layer 3 on which the macro structure is formed is bonded to the second base material 5 via the adhesive layer 4. The outer peripheral portion 9 is in close contact with the adhesive layer 4 over the entire surface, and the macro structure region 8 includes a space portion 16 that is blocked from the outside. In general, the space 16 is filled with air, but in order to suppress deterioration of the internal material, it is also possible to fill with an inert gas such as nitrogen gas or argon.

  Here, the outer peripheral portion 9 only needs to block the space existing in the macro structure region 8 from the outside, and a fine structure such as a diffraction grating may be formed on the structural layer 3 of the outer peripheral portion 9. Another layer such as a metal reflective layer or a transparent reflective layer may exist between the structural layer 3 and the adhesive layer 4.

  Since the first substrate 2 needs to be light transmissive, a transparent resin is used. Examples include polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, and the like.

  On the other hand, the second substrate 5 is not limited to the above, and an opaque resin and paper are used in addition to a transparent resin. Further, a printing layer may be provided between the second base material 5 and the adhesive layer 4.

  The first base material 2 and the second base material 5 as described above may be subjected to various processes such as an easy adhesion process and a charging process as necessary.

The adhesive layer 4 can be arbitrarily selected according to the material of the structural layer 3 and the second base material 5, the final use, and the like. For example, a heat-sensitive adhesive made of a thermoplastic resin, a pressure-sensitive adhesive Conventionally known adhesives such as a thermosetting adhesive, a moisture curable adhesive, a two-component curable adhesive, an anaerobic curable adhesive, and an ultraviolet curable adhesive can be arbitrarily used.
Here, the relationship between the first macro structure 6 and the second macro structure 7 and scattering and transmission will be described. 3 and 4 illustrate how light travels when the display body is observed from the first substrate side.

In both figures , the interface between the first substrate and the structural layer is omitted. 3 and 4 are different in the angle of the structure slope 13 of the prism structure 12, and the difference in angle causes a difference in scattering and transmission. In this display, the material of the structure layer is assumed to be a resin having a refractive index of 1.5, and the structure surface is in contact with air.

  In FIG. 3, since the angle of the structural slope 13 is steep, the light incident from the air layer side of the space 16 is refracted greatly at the structural slope 13 and does not reach the observer. As shown in the figure, the observer can observe only the scattered light 14 that has been repeatedly refracted and reflected in the structure.

  On the other hand, in FIG. 4, since the angle of the structural slope 13 is gentle, the light incident from the air layer side of the space 16 reaches the observer as transmitted light 15 although the traveling direction slightly changes due to refraction. In addition, since the angle of the structural slope 13 is gentle, the probability that the traveling direction of the light changes so that the internal disturbance light in the structural layer 3 reaches the eyes of the observer becomes low.

  The difference between scattering and transmission that occurs when the display 1 is viewed from the front is generated according to the above principle, but scattering and transmission may change even in the same structure by changing the observation angle. This change in scattering and transmission due to a change in viewpoint enables a moving expression or a three-dimensional expression, which is a complicated expression as a display body.

  FIG. 5 is an example of a structure including a plane parallel to the second base material 5 at the top of the macro structure region 8. In the macro structure region 8, it is in close contact with the second base material through the adhesive layer only at the top. As shown in FIG. 2, when the macro structure is a prism structure, the apex is the tip of a sharp prism, and the contact area with the adhesive layer is extremely small. When the contact area with the adhesive layer is small, the adhesive strength between the structural layer and the second substrate is lowered, leading to insufficient strength as a display body.

  On the other hand, as shown in FIG. 5, the strength of the display body can be increased by providing a flat portion at the top and increasing the contact area with the adhesive layer.

  However, the contact portion does not have a function of changing the visual effect depending on the observation condition, and behaves as a transparent layer. Therefore, when the contact area is increased, the function as the display body is deteriorated.

  The contact area between the top part of the macro structure region 8 and the adhesive layer is preferably such that the ratio of the projected area onto the second substrate of the closely adhered portion in the macro structure region 8 is 5 to 25%, and is 10 to 20%. A range is more preferred. This is because, if it is less than 5%, the adhesive strength between the structural layer and the second substrate is insufficient, and if it exceeds 25%, the expressive power as a display body is reduced.

  As a macro structure having a top part, a cylindrical lens, a hemisphere, a Fresnel lens, a linear Fresnel lens, etc. can be used in addition to a prism. Especially when it is desired to increase the adhesive strength, a columnar structure or a trapezoidal structure with a flat upper part. Can be used.

  6 is a cross-sectional view of a structure having a concavo-convex structure 10 at the top of the macro structure region 8 and an outer peripheral portion 9 adjacent to the macro structure region 8, and FIG. This is an example when viewed from the normal direction. The concavo-convex structure portion 10 is in close contact with the second base material via the adhesive layer. By having the concavo-convex structure 10, the adhesion between the structural layer 3 and the second substrate 5 is improved, and the strength of the display body 1 can be increased.

  As the size of the concavo-convex structure 10, a corrugated plate shape, a lattice shape, a honeycomb shape, a pillar shape, a hole shape or the like having a pitch and a depth of about 100 nm to 1 μm are preferable. If the structure size is less than this, it is difficult to create a desired shape, and therefore the effect of improving the adhesion is reduced. If the structure size is more than this, the effect of improving the adhesion is reduced because the number of concavo-convex structures that can be arranged is reduced. In addition, the concavo-convex structure 10 has a higher adhesion improvement effect as the aspect ratio of the structure is higher. However, since the shape is more difficult to create as the structure has a higher aspect ratio, the practical aspect ratio range is about 1-2. .

  FIG. 8 shows an example in which the adhesive layer 4 is provided only on the outer peripheral portion 9 and the top of the macro structure region 8. As described above, the portion where the structural layer 3 and the adhesive layer 4 are in close contact with each other has a small effect of reflection and refraction at the interface and behaves as a transparent layer, but by patterning the adhesive layer containing scattering particles, The scattering property of the close contact portion can be increased. Thereby, the effect of the transparency expression by the structure interface which touches space improves.

  As the scattering fine particles to be added to the adhesive layer 4, any particles that can scatter light can be used, and examples thereof include inorganic particles such as titanium oxide, silica, and hollow silica, and hollow organic fine particles. However, it is not necessarily limited to these.

  On the other hand, when the adhesive layer is provided on the entire surface without patterning, it is desirable that the adhesive layer has high transparency in order not to disturb the transparency expression by the structural interface in contact with the space portion 16.

  The method of providing the adhesive layer 4 only on the outer peripheral portion 9 and the top of the macro structure region 8 as shown in FIG. 8 is not particularly limited. For example, adhesive transfer as shown in FIG. A method using the sheet 17 can be exemplified.

  As the adhesive transfer sheet 17, a support 19 provided with a transferable adhesive layer 18 made of a thermoplastic resin can be used. Specific examples of the material of the transferable adhesive layer 18 include, for example, (Meth) acrylic resin, polyester resin, urethane resin, polyamide resin, vinyl chloride-vinyl acetate copolymer, chlorinated olefin resin, ethylene- (meth) acrylic copolymer, epoxy resin, etc. It is not limited to these, and various resins can be used alone or as a composite.

  By using such an adhesive transfer sheet 17, the transferable adhesive layer 18 is thermally transferred only to the top of the macro structure region 8, whereby the patterned adhesive layer 4 can be obtained.

  However, as shown in FIG. 9, it is desirable to have an uneven structure 10 at the top of the macro structure region 8. This is because, by providing the concavo-convex structure 10 at the top, an anchoring effect on the transferable adhesive layer 18 and an effect of improving the adhesion by increasing the contact area, etc., can be expected, and an improvement in transferability of the transferable adhesive layer 18 can be expected. Because.

  FIG. 10 is a cross-sectional view when the brittle layer 11 is provided between the first base material 2 and the structural layer 3, and FIG. 11 shows the display body of FIG. 10 between the first base material 2 and the second base material 5. It is sectional drawing when it peels between. The adhesion between the first substrate 2 and the brittle layer 11 is lower than the adhesion between the structural layer 3 and the second substrate 5 and greater than the force required for the structural layer 3 to break in the direction perpendicular to the layer. Designed as Thus, even if the first base material 2 and the second base material 5 are intentionally separated for the purpose of tracing the shape of the structure interface, a part of the structural layer is on the first base material 2 side and the rest is the first base material 2 side. Since it is destroyed to the 2 base material 5 side, it becomes possible to prevent imitation and forgery copying the shape of the structure interface.

  The second base material 5 is applied to various security items such as banknotes, passports, cards, anti-counterfeit labels, stamps, etc. made of a plastic base material or a paper base material. It is possible to provide an anti-counterfeit printed matter having an excellent visual effect and high security by a method of pasting a configuration including the above or a method of providing a base substrate of an article as the second substrate 5.

DESCRIPTION OF SYMBOLS 1 ... Display body 2 ... 1st base material 3 ... Structure layer 4 ... Adhesion layer 5 ... 2nd base material 6 ... 1st macro structure 7 ... 2nd macro structure 8 ... Macro structure area | region 9 ... Outer peripheral part 10 ... Uneven structure 11 ... Brittle layer 12 ... Prism structure 13 ... Structural slope 14 ... Scattered light 15 ... Transmitted light 16 ... Space 17 ... Adhesive transfer sheet 18 ... Transferable adhesive layer 19 ... Support

Claims (7)

A display body provided with at least a first base material, a structural layer provided on the first base material, and a second base material in this order,
The structural layer includes a macrostructure region having at least a first macrostructure portion and a second macrostructure portion on a surface opposite to the first base material side, and an outer peripheral portion adjacent to the macrostructure region. Have
In the macro structure region, only the top portion of the structural layer is in close contact with the second base material via an adhesive layer, and the outer peripheral portion is formed on the entire surface of the structural layer via the adhesive layer. Close contact,
In the structural layer, the area not in close contact with the second base material forms a space part,
When observed from a specific angle on the first substrate side,
In the first macro structure part, light totally reflected at the interface between the structure layer and the space part is observed,
In the second macro structure portion, light transmitted through an interface between the structure layer and the space portion is observed.   The display body according to claim 1, wherein the top portion includes a plane parallel to the second base material.   The display body according to claim 1, wherein the display portion has a concavo-convex structure on the top portion in contact with the adhesive layer or the side of the outer peripheral portion in contact with the adhesive layer.   The display body according to claim 1, wherein the adhesive layer is provided only in a portion where the structural layer and the second base material are in close contact with each other.   The display body according to claim 4, wherein the adhesive layer includes scattering particles.   The display body according to any one of claims 1 to 5, wherein the first base material and the structural layer are brittlely peeled off.   A printed matter comprising the display body according to any one of claims 1 to 6.