JP2009086648A - Display body and labeled article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technique for achieving a higher forgery preventing effect. <P>SOLUTION: This display body 10 includes: a rugged structure region having a plurality of recessed or projecting parts or both thereof arranged in two dimensions on one principal surface of a light transmitting layer; and a reflection layer supported on the one principal surface to cover at least part of the rugged structure region, wherein the pitch of the plurality of recessed or projecting parts or both thereof ranges from 200 nm to 500 nm. A plurality of rugged structure regions are provided, and at least one rugged structure region is different from other rugged structure regions in the shape, depth or height, pitch and arrangement pattern of the plurality of recessed or projecting parts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a forgery prevention technique.

  It is desirable that authentication items such as cash cards, credit cards and passports, and securities such as gift certificates and stock certificates are difficult to counterfeit. Therefore, conventionally, a label that is difficult to counterfeit or counterfeit and is easy to distinguish from counterfeit or counterfeit is attached to such articles in order to prevent counterfeiting.

  In recent years, the distribution of counterfeit products has been regarded as a problem for items other than certified items and securities. Therefore, the opportunity to apply the above-described anti-counterfeiting technology with respect to certified articles and securities is increasing.

  Patent Document 1 describes a display body formed by arranging a plurality of pixels. In this display body, each pixel includes a relief type diffraction grating in which a plurality of grooves are arranged.

  Since this display body displays an image using diffracted light, it cannot be counterfeited using a printing technique or an electrophotographic technique. Therefore, if this display is attached to an article as a label for authenticity determination, it is possible to confirm that the article is genuine by viewing the image displayed by this label. Therefore, an article with this label attached is less likely to be counterfeited than an article without this label attached.

However, the relief-type diffraction grating can be formed relatively easily if there is an apparatus such as a laser. The previous display body changes the display image by changing the incident angle of the illumination light, the observation angle, or the orientation of the display body, but the change is not rich in diversity. Therefore, with the development of technology, the anti-counterfeit effect of the display body is decreasing. Here, the fact that counterfeiting or counterfeiting is difficult, and the fact that it is easy to distinguish from counterfeiting or counterfeiting are called anti-counterfeiting effects.
JP-A-2-72320

  An object of the present invention is to realize a higher anti-counterfeit effect.

  According to the first aspect of the present invention, the one main surface of the light transmission layer is provided with a concavo-convex structure region including a plurality of recesses and / or projections arranged two-dimensionally, and is supported by the one main surface. A display layer comprising a reflective layer covering at least a part of the concavo-convex structure region, wherein a distance between centers of the plurality of concave portions and / or convex portions is in the range of 200 nm to 500 nm. Is provided.

  According to the second aspect of the present invention, there is provided a labeled article comprising the display according to the first aspect and an article supporting the display.

  According to the present invention, it is possible to achieve a higher anti-counterfeit effect.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same referential mark is attached | subjected to the component which exhibits the same or similar function, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a plan view schematically showing a display body according to one aspect of the present invention. 2 is a cross-sectional view taken along the line II-II of the display shown in FIG.

The display body 10 includes a light transmission layer 11 and a reflection layer 13. In the example shown in FIG. 2, one main surface of the light transmission layer 11 includes an uneven structure region 12a and a non-recessed structure region 12b. Yes. As will be described later, the concavo-convex structure region 12a is provided with a plurality of concave portions and / or convex portions.
Furthermore, the reflective layer 13 is formed on one main surface of the light transmission layer 11 including the concavo-convex structure region 12a so as to cover at least a part of the concavo-convex structure region 12a.

  As a material of the light transmission layer 11, for example, a resin having light transmittance can be used. For example, when a thermoplastic resin or a photocurable resin is used, the light transmission layer 11 in which a plurality of concave portions and / or convex portions are provided on one main surface can be easily formed by transfer using an original plate. it can.

  When the display body 10 according to the present invention includes both the light transmission layer 11 and the reflection layer 13, the surface of the concavo-convex structure region 12a is less likely to be damaged as compared with the case where only one of them is included. An image with better visibility can be displayed on the body.

  As the reflective layer 13, for example, a metal layer made of a metal material such as aluminum, silver, and alloys thereof can be used. Alternatively, as the reflective layer 13, a dielectric layer having a refractive index different from that of light transmittance may be used. Alternatively, as the reflective layer 13, a laminate of dielectric layers having different refractive indexes between adjacent ones, that is, a dielectric multilayer film may be used. However, the refractive index of the dielectric layer included in the dielectric multilayer film that is in contact with the light transmission layer needs to be different from the refractive index of the light transmission layer.

  FIG. 3 is an enlarged perspective view showing an example of a structure that can be employed in the uneven structure region 12a of the display body shown in FIGS.

A plurality of convex portions 14b are provided in the concavo-convex structure region 12a shown in FIG. Here, the concavo-convex structure region 12a is formed only by the plurality of convex portions 14b, but this is only an example, and in the present invention, the concavo-convex structure region is formed using a plurality of concave portions or a plurality of concave portions and convex portions. 12a can be formed.
Moreover, the non-relief structure region 12b shown in FIG. 2 is a flat surface.

Next, a special visual effect of the display body 10 caused by the uneven structure region 12a will be described.
FIG. 4 is a diagram schematically showing how the concavo-convex structure region 12a emits diffracted light. In FIG. 4, 31 indicates illumination light, 32 indicates regular reflection light or zero-order diffracted light, and 33 indicates first-order diffracted light.

  In the concavo-convex structure region of the present invention, when the concavo-convex structure region is illuminated when the center-to-center distance between the concave portion and / or the convex portion has a constant period, the concavo-convex structure region is caused to advance the illumination light that is incident light. Diffracted light is emitted in a specific direction with respect to the direction.

The most representative diffracted light is first-order diffracted light. The exit angle β of the first-order diffracted light can be calculated from the following equation (1).
d = λ / (sin α−sin β) (1)
In this equation (1), d represents the distance between the centers of the concave or convex portions, and λ represents the wavelengths of incident light and diffracted light. Α represents the exit angle of 0th-order diffracted light, that is, transmitted light or specularly reflected light. In other words, the absolute value of α is equal to the incident angle of the illumination light, and the incident angle is symmetrical with respect to the Z axis (in the case of a reflective diffraction grating). For α and β, the clockwise direction from the Z axis is the positive direction.

  As is apparent from equation (1), the exit angle β of the first-order diffracted light changes according to the wavelength λ. That is, the uneven structure region has a function as a spectroscope. Therefore, when the illumination light is white light, the color perceived by the observer changes when the observation angle of the concavo-convex structure region is changed.

  In addition, the color perceived by the observer under a certain observation condition changes according to the center distance d. As an example, it is assumed that the concavo-convex structure region emits first-order diffracted light in the normal direction. That is, the exit angle β of the first-order diffracted light is assumed to be 0 °. Assume that the observer perceives this first-order diffracted light. If the emission angle of the 0th-order diffracted light at this time is αN, equation (1) can be simplified to equation (2) below.

d = λ / sin αN (2)
As is clear from equation (2), in order for the observer to perceive a specific color, the wavelength λ corresponding to the color, the incident angle | αN | of the illumination light, and the center distance d are equal to each other. What is necessary is just to set so that the relationship shown to Formula (2) may be satisfied.

  As described above, the center-to-center distances of the plurality of concave portions and / or convex portions provided in the concavo-convex structure region 12a are in the range of 200 nm to 500 nm. Therefore, the reflectance of the regular reflection light 33 with respect to the illumination light 31 can be significantly reduced, and the first-order diffracted light 33 of visible light can be generated in a specific direction depending on the incident angle of the illumination light 31 due to the periodicity of the structure. Can do.

  Therefore, for example, when the display body 10 is observed from the normal direction, the concavo-convex structure region 12a looks black. Here, “black” means, for example, all light components having a wavelength in the range of 400 nm to 700 nm when the display 10 is irradiated with light from the normal direction and the intensity of specular reflection light is measured. Means that the reflectance is 10% or less. Therefore, the concavo-convex structure region 12a looks like a black print layer.

  Further, if the emission angle of the first-order diffracted light 33 from the concavo-convex structure region 12a is within a range of −90 ° to 90 °, by appropriately setting the angle formed by the normal direction of the display body 10 and the observation direction, The observer can perceive the first-order diffracted light 33 from the concavo-convex structure region 12a. Therefore, in this case, it can be visually confirmed that the uneven structure region 12a is different from the black print layer.

  That is, the concavo-convex structure region 12a can remarkably reduce the reflectivity of the regular reflection light with respect to the incident light, and generates visible reflected diffracted light in a specific direction depending on the incident angle of the incident light due to the periodicity of the structure. Can be made. Therefore, under many observation conditions, the uneven structure region 12a looks black, and the non-recessed structure region 12b is observed with normal reflected light, so that an image with a large contrast can be displayed.

  On the other hand, since the diffracted light can be observed under the condition in which the first-order diffracted light 33 is observed, the image displayed normally in black appears to shine suddenly by changing the observation angle. Visual effects can be imparted.

  Therefore, when this display body 10 is used as a label for preventing forgery, a high forgery preventing effect can be realized.

  Further, it is possible to form an original plate by using a method such as recording interference fringes in a photoresist with laser light or fine processing at a constant pitch. Furthermore, the same display body can be accurately mass-produced by embossing a thermoplastic resin or a photocurable resin using the original plate. On the other hand, it is very difficult to analyze the fine structure and arrangement pattern from the appearance of the display body of the present invention to produce the same display body, and the effect of preventing forgery is high.

  5 and 6 are plan views schematically showing an example of a display body in which a display surface is configured by a plurality of uneven structure regions.

  In the display body 10 shown in FIG. 5, the display surface is configured by two uneven structure regions PX1 and PX2 and two non-recessed structure regions PX3 and PX4. The uneven structure area PX1 and the uneven structure area PX2 have different uneven shapes. Here, the concavo-convex shape means the shape, depth or height, distance between centers, and arrangement pattern of the concave or convex portions.

  In the display body shown in FIG. 5, by arranging two uneven structure regions (PX1 and PX2) having different uneven shapes in the plane, an optical difference between two uneven structure regions having different uneven shapes (that is, Depending on the reflectivity, diffraction efficiency, difference of the diffracted light emission direction and wavelength (color), etc., the shade and color of the image, the viewing direction, etc. can be set, and a display with a high visual effect can be performed.

  Next, in the display body 10 shown in FIG. 6, the display surface is constituted by two uneven structure regions PX5 and PX6 and one non-recessed structure region PX7. The uneven structure region PX5 and the uneven structure region PX6 have different uneven shapes.

  In the display body 10 shown in FIG. 6, a plurality of concavo-convex structure regions (PX5 and PX6) having different concavo-convex shapes are arranged adjacent to each other, so that diffracted light generated by one concavo-convex structure region (for example, PX5) is adjacent. Further diffracted by the other concavo-convex structure region (for example, PX6), and diffracted light is emitted in a direction that cannot be generated only by the one concavo-convex structure region (PX5 or PX6) only at the adjacent boundary portion. The border can be shined like a border. In particular, in only one uneven structure region (PX5 or PX6), it is possible to easily observe diffracted light even in an illumination state where the diffraction angle is too large and diffracted light is not observed near the front. Since this visual effect does not contradict the above-described visual effect, in addition to the two types of black and diffracted light, each uneven structure region (PX5 and PX6) appears black, and adjacent uneven structure regions (PX5 And PX6), a total of three types of visual effects can be obtained in a state where diffracted light is generated at the border.

FIG. 7 is an enlarged perspective view showing an example of a structure that can be employed in the uneven structure region.
In the concavo-convex structure region 12a shown in FIG. 7, a plurality of concave portions 14a, convex portions 14b, and intermediate portions 14c are provided, and a concave row 16a formed by the plurality of concave portions 14a and a convex formed by the plurality of convex portions 14b. The extending direction (the Y direction in FIG. 7) of the recessed portion row 16a and the protruding portion row 16b is substantially the same, and the recessed portion row 16a and the protruding portion row 16b intersect with the extending direction Y ( They are arranged alternately in the X direction in FIG. Here, the direction X that intersects the extension direction Y is orthogonal, but is not limited thereto.
Further, the intermediate portion 14c can be omitted.
In the case of mass production by embossing, it is preferable from the viewpoint of ease of molding that the entire concavo-convex structure region 12a including the concave portions 14a and the convex portions 14b is lower than the main surface.

  The recess row 16a in the present invention has a plurality of recess portions 14a formed in a row, and as shown in FIG. 7, the recess row 16a may be straight, curved, or meandering. Good. The same applies to the convex row 16b in the present invention.

  Furthermore, the extension direction of the recessed part row | line | column 16a and the convex part row | line | column 16b should just be substantially the same, This means that the adjacent recessed part row | line | column 16a and the convex part row | line | column 16b do not cross | intersect.

Since the concavo-convex structure region 12a shown in FIG. 7 includes a plurality of concave portions 14a and convex portions 14b, the concave-convex structure region includes only the concave portions 14a or only the convex portions 14b. Even if the depth is shallow and the height of the convex portion 14b is lowered, the reflectance can be lowered. That is, a deeper black color can be displayed without increasing the depth of the concave portion 14a and increasing the height of the convex portion 14b.
In addition, since the concavo-convex shape is more complex than the concavo-convex structure region having only the concave portion 14a or only the convex portion 14b, analysis of the concavo-convex shape becomes more difficult, and the forgery prevention effect can be enhanced.

  FIG. 8 is a plan view schematically showing a method for manufacturing the concavo-convex structure region 12a including the concave portions 14a and the convex portions 14b.

  In FIG. 8, the first linear recess is formed in the Y direction as indicated by the broken line regions L1 to L5. Next, as shown in broken line regions L6 to L10, a second linear recess is formed in the X direction. Since the recessed portions are formed twice at the locations where the broken line regions L1 to L5 and the broken line regions L6 to L10 intersect, the deepest recessed portion 14a (indicated by a black circle in FIG. 8) is formed. In the broken line areas L1 to L10, where the broken line areas do not intersect, the concave part is formed only once, so that an intermediate part 14c having a depth approximately half that of the concave part 14a is formed. A portion outside the broken line regions L1 to L10 and surrounded by the broken line regions L1 to L10 has not been formed with a recess, and thus has a convex portion 14b having no depth (indicated by white circles in FIG. 8). ) Is formed. Specific examples of the method for forming the recess include a method of recording a laser interference pattern on the resist material and performing electron beam drawing.

In the original plate of the concavo-convex structure region 12a formed using the manufacturing method shown in FIG. 8, the resist material surface and the tip of the convex portion 14b are located at the same height. That is, when the height of the intermediate portion 14c is regarded as a plane and used as a reference plane, the reference plane is located below the resist material surface.
However, the concavo-convex structure region 12a of the present invention is not limited to this, and in the concavo-convex structure region 12a having the concave portions 14a and the convex portions 14b, the reference plane is located on the same plane as the resist material surface. May be located at the top. Furthermore, as described above, the intermediate portion 14c can be omitted.
Further, in the concavo-convex structure region 12a including the concave portion 14a and the convex portion 14b, the depth of the concave portion 14a and the height of the convex portion 14b mean the depth and height from the reference plane.

  FIG. 9 to FIG. 12 are plan views schematically showing an example of the arrangement pattern of the concave portion and / or the convex portion that can be employed in the concavo-convex structure region 12a.

  In FIG. 9, the array of recesses or protrusions or both forms a square lattice. This structure is relatively easy to manufacture using a microfabrication apparatus such as an electron beam drawing apparatus or a stepper, and is also relatively easy to control with high accuracy such as the distance between the centers of the recesses and / or protrusions.

  Moreover, in the structure of FIG. 9, the recessed part or the convex part or both are regularly arranged. Therefore, when the distance between the centers of the concave portion and / or the convex portion is set to be relatively long, the diffracted light can be emitted from the concave-convex structure region 12a. In this case, it can be visually confirmed that the uneven structure region 12a is different from the black printed layer. In addition, when the distance between the centers of the concave part and / or the convex part is set relatively short, for example, when it is set to 200 nm or less, the emission of the diffracted light from the concavo-convex structure region 12a can be prevented. In this case, regarding the observed color, it becomes difficult to understand that the uneven structure region 12a is different from the black print layer.

  In FIG. 9, the distance between the centers of the recesses and / or protrusions is the same in the X direction and the Y direction, but the distance between the centers of the recesses and / or protrusions is different between the X and Y directions. Also good. That is, the arrangement of the concave portions or the convex portions or both may form a rectangular lattice.

  When the distance between the centers of the concave portion and / or the convex portion is set to be relatively long in both the X direction and the Y direction, the display body 10 is illuminated from the direction perpendicular to the Y direction and the display body from the direction perpendicular to the X direction. The diffracted light can be emitted from the concavo-convex structure region 12a both in the case of illuminating 10 and the wavelength of the diffracted light can be made different between the former and the latter. If the distance between the centers of the concave portion and / or the convex portion is set to be relatively short in both the X direction and the Y direction, it is possible to prevent the diffracted light from being emitted from the concavo-convex structure region 12a regardless of the illumination direction. When the distance between the centers of the concave portion and / or the convex portion is set to be relatively long in one of the X direction and the Y direction, and set to be relatively short on the other side, the display body 10 is viewed from a direction perpendicular to one of the Y direction and the X direction. Diffracted light is emitted from the concavo-convex structure region 12a, and when the display body 10 is illuminated from a direction perpendicular to the other of the Y direction and the X direction, the diffracted light is prevented from being emitted from the concavo-convex structure region 12a. it can.

  In FIG. 10, the array of recesses or protrusions or both forms a triangular lattice. When this structure is adopted, diffracted light can be emitted from the concavo-convex structure region 12a if the distance between the centers of the recesses and / or protrusions is set to be relatively long, as in the case of adopting the structure of FIG. If the distance between the centers of the concave portion and / or the convex portion is set to be relatively short, the emission of diffracted light from the concave-convex structure region 12a can be prevented.

  Further, when the structure of FIG. 10 is adopted, if the distance between the centers of the concave portion and / or the convex portion is appropriately set, for example, when the display body 10 is illuminated from the A direction, the diffracted light is emitted from the concave and convex structure region 12a. When the display body 10 is illuminated from the B direction and the C direction, diffracted light can be emitted from the concavo-convex structure region 12a. That is, a more complicated visual effect can be obtained.

  In FIG. 11, the concave portions and / or convex portions are irregularly arranged. When the concave portion or the convex portion or both are irregularly arranged, the emission of the diffracted light from the concave-convex structure region 12a is more difficult to occur. This structure can be formed, for example, by recording the speckle intensity distribution using light interference.

  In FIG. 12, the concave portions and / or convex portions are irregularly arranged, and the sizes thereof are not uniform. When this structure is employed, the diffracted light is more unlikely to be emitted from the concavo-convex structure region 12a than when the structure of FIG. 11 is employed.

  As illustrated in FIGS. 9 to 12, various modifications can be made to the arrangement pattern of the concave portions and / or the convex portions. Each arrangement pattern has a visual effect unique to the arrangement pattern. Therefore, if the concavo-convex structure region 12a is composed of a plurality of pixels having different arrangement patterns of the concave portion or the convex portion or both, a more complicated visual effect can be obtained.

  FIG. 13 to FIG. 15 are perspective views showing enlarged concavo-convex structure regions that can be employed in the present invention. Here, the concavo-convex structure region 12a is formed only by the plurality of convex portions 14b, but this is only an example, and in the present invention, the concavo-convex structure region is formed using a plurality of concave portions or a plurality of concave portions and convex portions. 12a can be formed.

  The structure shown in FIGS. 13 to 15 is a modification of the structure shown in FIG. Each of the convex portions shown in FIGS. 13 to 15 has a forward tapered shape. Therefore, the reflectance of the regular reflection light 33 in the concavo-convex structure region 12a is small no matter what angle is observed.

  In the structure shown in FIG. 3, the convex part 14b has a conical shape. When the concave portion and / or the convex portion have a conical shape, the concave portion and / or the convex portion may have a sharp tip or a truncated conical shape. However, when the concave portion and / or convex portion has a conical shape with a sharp tip, the concave portion and / or convex portion does not have a surface parallel to the concavo-convex structure region. Thus, the reflectance of the regular reflection light in the concavo-convex structure region can be further reduced.

  In the structure shown in FIG. 13, the convex part 14b has a quadrangular pyramid shape. The concave portion and / or the convex portion may have a pyramid shape other than a quadrangular pyramid shape such as a triangular pyramid shape. In this case, the intensity of the diffracted light generated under specific conditions can be increased, and observation is easier. Moreover, when making a recessed part and / or a convex part into a pyramid shape, the recessed part and / or a convex part may have a pointed tip, and may have a truncated pyramid shape. However, when the concave portion and / or convex portion has a pyramid shape with a sharp tip, the concave portion and / or convex portion does not have a surface parallel to the concavo-convex structure region. Thus, the reflectance of the regular reflection light in the concavo-convex structure region can be further reduced.

In the structure shown in FIG. 14, the convex portion 14b has a spindle shape. When the structure shown in FIG. 14 is adopted, the reflectance of the concavo-convex structure region cannot be reduced as much as when the structure shown in FIG. 3 or FIG. 13 is adopted. However, when the structure shown in FIG. 14 is adopted, compared to the case where the structure shown in FIG. 3 or FIG. 13 is adopted, the formation of concave portions and / or convex portions on the original plate and the concave portions from the original plate to the light transmission layer 11 are achieved. And / or the transfer of the convex portion is easier.
Moreover, in the structure shown in FIG. 7, the recessed part 14a and the convex part 14b which have a spindle shape are used.

  In the structure shown in FIG. 15, the convex portion 14b has a structure in which a plurality of square pillars having different bottom areas are stacked in order from the largest bottom area. Instead of the quadrangular columns, columnar bodies other than the quadrangular columns such as cylinders and triangular columns may be stacked.

  When the structure shown in FIG. 15 is adopted, the reflectance of regular reflection light in the concavo-convex structure region cannot be reduced as much as the structure shown in FIG. 3, FIG. 13 or FIG. 14 is adopted. However, when the structure shown in FIG. 15 is adopted, as in the case where the structure shown in FIG. 14 is adopted, compared with the case where the structure shown in FIG. 3 or FIG. It is easier to form and transfer the concave and / or convex portions from the original to the light transmission layer 11.

  As described above, the shape of the concave and / or convex portions affects the reflectance of the concavo-convex structure region. Therefore, when a concavo-convex structure region is configured by a plurality of pixels having different concave and / or convex shapes, gradation display can be performed in the concavo-convex structure region.

  In the present invention, when the center-to-center distance of the concave portion or the convex portion or both is 400 nm or less, the diffracted light component from the concave portion or the convex portion or both is generated in the front direction in the visible wavelength range of 400 to 700 nm. Can be avoided. In the formula (2), even if the illumination light is 89 °, the light of 400 nm finally goes in the front direction, so that the diffracted light with sufficient intensity is substantially depressed under all illumination conditions for all visible wavelengths. Or it does not generate | occur | produce in a front direction from a convex part or both. Therefore, when observed from the front direction, the concavo-convex structure region can be made to appear black more reliably, authenticity determination is facilitated, and the forgery prevention effect is enhanced.

  When the center-to-center distance between the recesses and / or the protrusions is 200 nm or more and 350 nm or less, at least the diffracted light of the red component is not observed in the uneven structure region in the visible wavelength range of 400 to 700 nm. In the formula (1), at a center distance of 350 nm, in the case of 89 ° illumination light, 700 nm light is diffracted in the 89 ° direction, so that substantially red light has sufficient intensity under all illumination conditions. Diffracted light is not generated in the front direction from the concave portion or the convex portion or both. On the other hand, when the distance between centers is 200 nm, in the case of 89 ° illumination light, 400 nm light is diffracted in the 89 ° direction. Therefore, when the arrangement interval between the concave portions and / or the convex portions is 200 nm or more and 350 nm or less, diffracted light other than red can be similarly observed from deep angles with respect to illumination light having deep angles. In addition, diffracted light is not generated under other conditions, and diffracted light is not recognized under general observation conditions. Therefore, when observed from the front direction, the uneven structure region can appear more reliably black, and blue or green diffracted light can be observed under certain conditions, making authenticity determination easy and reliable. , Enhance anti-counterfeit effect.

  The concavo-convex structure region appears darker when the depth or height of the concave portion or convex portion is increased. For example, if the depth or height of the concave portion or the convex portion is set to ½ or more of the center-to-center distance, the concavo-convex structure region looks extremely dark. Therefore, when a concavo-convex structure region is constituted by a plurality of pixels having different depths or heights of the concave portions or the convex portions, gradation display can be performed in the concavo-convex structure region.

  The concavo-convex structure region appears darker when the dimension in one direction parallel to the concavo-convex structure region of the concave portion or convex portion and the distance between the centers of the concave portion or convex portion in this direction are close to 1: 1. And when the dimension about one direction parallel to the uneven | corrugated structure area | region of a recessed part or a convex part and the center distance about this direction are made equal, an uneven | corrugated structure area | region looks the darkest. Therefore, when the concavo-convex structure region is configured by a plurality of pixels having different ratios, gradation display can be performed in the concavo-convex structure region.

  Further, in the display body according to the present invention, a reflective layer is formed on one main surface of the light transmission layer having the uneven structure region so as to cover at least a part of the uneven structure region, and further, at least the uneven structure region is covered. A resin layer may be formed as described above.

  As the resin layer, for example, a resin such as acrylic, urethane, or epoxy can be used. However, if a part of the concavo-convex structure region is not covered by the reflective layer, the concavo-convex structure is invalidated if the refractive index is the same as the refractive index of the light transmission layer, and the presence or absence of the reflective layer is conspicuous. is there.

  By doing so, foreign matter does not enter the surface of the concavo-convex structure region and the function of the present invention is not greatly impaired, and a reliable and stable authenticity determination can be performed using the display body of the present invention. In particular, when the reflectance of the reflective layer is less than 100%, by coating the reflective layer side of the light transmitting layer with a resin layer, the refractive index can be changed from the refractive index of air (1.0) to that of the resin compared to before coating The refractive index (around 1.4 to 1.6) increases, the reflectance at the interface between the reflective layer and the resin layer can be reduced, and the visual effect can be clarified.

  FIG. 16 is a plan view schematically showing an example of a labeled article in which an anti-counterfeiting or identification label is supported on the article. FIG. 16 shows a printed matter 100 as an example of an article with a label. At this time, if the above-mentioned resin layer is an adhesive or a pressure-sensitive adhesive, it may be easily realized.

  The printed material 100 is a magnetic card and includes a base material 51. The base material 51 is made of plastic, for example. A printed layer 52 and a strip-shaped magnetic recording layer 53 are formed on the substrate 51. Further, the display body 10 is attached to the base material 51 as a forgery prevention or identification label. The display 10 has the same structure as that described with reference to FIGS. 1 and 2 except that the displayed image is different.

  The printed material 100 includes a display body 10. Therefore, as described above, it is difficult to forge or imitate the printed material 100. In addition, since the printed matter 100 includes the display body 10, it is easy to discriminate between a genuine product and a non-authentic product for an article whose authenticity is unknown. Moreover, since the printed matter 100 further includes the printed layer 52 in addition to the display body 10, it is easy to compare the appearance of the printed layer 52 with the appearance of the display body. Therefore, compared with the case where the printed matter 100 does not include the printed layer 52, it is easier to determine an article whose authenticity is unknown from a genuine product to a non-authentic product.

  In FIG. 16, a magnetic card is illustrated as a printed material including the display body 10, but the printed material including the display body 10 is not limited thereto. For example, the printed matter including the display body 10 may be another card such as a wireless card, an IC (integrated circuit) card, or an ID (identification) card. Alternatively, the printed matter including the display body 10 may be securities such as gift certificates and stock certificates. Alternatively, the printed matter including the display body 10 may be a tag to be attached to an article to be confirmed as a genuine product. Alternatively, the printed matter including the display body 10 may be a package body that contains an article to be confirmed to be genuine or a part thereof.

  In the printed matter 100 shown in FIG. 16, the display body 10 is attached to the base material 51, but the display body 10 can be supported on the base material by other methods. For example, when paper is used as the base material, the display body 10 may be rolled into the paper and the paper may be opened at a position corresponding to the display body 10.

  Moreover, the labeled article may not be a printed material. That is, the display body 10 may be supported on an article that does not include a printed layer.

The top view which shows schematically the display body which concerns on 1 aspect of this invention. Sectional drawing along the II-II line of the display body shown in FIG. The perspective view which expands and shows an example of the structure employable for the uneven | corrugated structure area | region of the display body shown in FIG.1 and FIG.2. The figure which shows a mode that an uneven | corrugated structure area | region emits diffracted light roughly. The top view which shows roughly an example of the display body which comprised the display surface by the some uneven | corrugated structure area | region. The top view which shows roughly an example of the display body which comprised the display surface by the some uneven | corrugated structure area | region. The perspective view which expands and shows an example of the uneven | corrugated structure area | region employable in this invention. The top view which shows roughly the manufacturing method of an uneven | corrugated structure area | region provided with a recessed part and a convex part. The top view which shows roughly the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as an uneven | corrugated structure area | region, or both. The top view which shows roughly the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as an uneven | corrugated structure area | region, or both. The top view which shows roughly the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as an uneven | corrugated structure area | region, or both. The top view which shows roughly the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as an uneven | corrugated structure area | region, or both. The perspective view which expands and shows an example of the uneven | corrugated structure area | region employable in this invention. The perspective view which expands and shows an example of the uneven | corrugated structure area | region employable in this invention. The perspective view which expands and shows an example of the uneven | corrugated structure area | region employable in this invention. The top view which shows roughly an example of the labeled article formed by making an anti-counterfeiting or identification label supported by the article.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Display body, 11 ... Light-transmitting layer, 12a ... Uneven structure area, 12b ... Non-uneven structure area, 13 ... Reflective layer, 14a ... Recessed part, 14b ... Convex part, 14c ... Middle part, 16a ... Recessed row, 16b ... Convex part row, 31 ... illumination light, 32 ... regular reflection light or 0th order diffracted light, 33 ... first order diffracted light, 51 ... base material, 52 ... printing layer, 53 ... magnetic recording layer, 100 ... printed matter.

Claims (12)

Provided on one main surface of the light transmission layer is a concavo-convex structure region including a plurality of recesses and / or projections arranged two-dimensionally, and is supported by the one main surface, and at least a part of the concavo-convex structure region A reflective layer covering
A display body, wherein a distance between centers of the plurality of concave portions and / or convex portions is in a range of 200 nm to 500 nm. A plurality of the uneven structure regions,
The shape, depth or height, center-to-center distance, and arrangement pattern of the plurality of recesses or protrusions in at least one of the uneven structure regions are different from those in other uneven structure regions. The display body. A plurality of the uneven structure regions,
In at least one concavo-convex structure region, the shape, depth or height, center-to-center distance, and arrangement pattern of the plurality of concave or convex portions are different from other concavo-convex structure regions
The display body according to claim 1, wherein different concavo-convex structure regions are arranged adjacent to each other. The concavo-convex structure region comprises a plurality of concave portions and convex portions,
A recess array formed by the plurality of recesses;
A convex row formed by the plurality of convex portions, and
The extension direction of the concave portion row and the convex portion row is substantially the same,
4. The display body according to claim 1, wherein the concave portion rows and the convex portion rows are alternately arranged in a direction intersecting the extension direction. 5. The concavo-convex structure region comprises a plurality of concave portions or convex portions or both,
A center-to-center distance in a specific direction of the plurality of recesses or protrusions or both is constant, and a center-to-center distance in a direction intersecting the specific direction of the plurality of recesses or protrusions or both is also constant. The display body according to claim 1, wherein the display body is provided. The concavo-convex structure region comprises a plurality of concave portions or convex portions or both,
The center-to-center distances in a specific direction of the plurality of recesses and / or protrusions are constant, and the center-to-center distances in the direction intersecting the specific direction of the plurality of recesses and / or protrusions are different from each other. The display body according to claim 1, wherein the display body is a display body.   The display body according to claim 1, wherein the plurality of concave portions and / or convex portions are irregularly arranged.   The display body according to claim 1, wherein the center-to-center distance is 400 nm or less.   The display body according to claim 1, wherein the center-to-center distance is in a range of 200 nm to 350 nm.   The display body according to any one of claims 1 to 9, wherein a depth or a height of the plurality of concave portions or convex portions is ½ or more of the center-to-center distance. Provided with the concavo-convex structure region on one main surface of the light transmission layer,
A reflective layer supported on the one main surface and covering at least a part of the concavo-convex structure region;
A resin layer supported on the one main surface and covering at least the uneven structure region;
The display body according to claim 1, wherein the display body is sequentially provided.   A labeled article comprising the display body according to any one of claims 1 to 11 and an article supporting the display article.

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