JP2013083813A - Display body and article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display body having high designability and providing a clear visual effect, where a moire image and emission light from a relief structure like a diffraction grating are combined, and to provide an article.SOLUTION: The display body includes: a lens formation layer which is provided on one surface of a substrate and includes a lens formation region at least a part of which a plurality of lenses are arranged in to represent a pattern like a character, a symbol, or an image and a non-lens formation region without the lenses, at least a part of which a character, a symbol, an image or the like is patterned in; a display layer including a lens display region in which a plurality of display elements are provided at respective focus positions of the plurality of lenses and are arranged at intervals different from an arrangement pitch of the plurality of lenses so as to represent the same pattern like a character, a symbol, or an image, as in the lens formation region; and a non-lens display region having a light reflecting layer in at least a part of a relief structure which is provided in the display layer located under the non-lens formation region. The relief structure comprises a plurality of concave or convex portions arranged like the same pattern such as a character, a symbol or an image as in the non-lens formation region.

Description

  The present invention relates to a display body and an article provided with the display body.

  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 suppress counterfeiting.

  Under such circumstances, display bodies using the moire effect have recently been actively used for the purpose of preventing counterfeiting and falsification of banknotes. Patent Document 1 describes a valuable object constituting a moire pattern. The moire pattern and the moire analyzer are appropriately superimposed, and the observer can visualize the moire image.

  As the moiré pattern, a printed layer formed of ink or pigment or a concavo-convex structure such as a diffraction grating can be used, which enables various expressions of moiré images.

  In the case of the display body as described above, a microlens array is often used as a moire analyzer. When a microlens is used as a moire analyzer, a strict optical design is required to use an uneven shape such as a diffraction grating as a moire pattern. In addition, when the focal length of the lens is shifted at the time of production, the accuracy of the production is required, such as the observed moire image being blurred or the effect of the diffracted light emitted from the diffraction grating is lost. It is done.

Japanese Patent No. 4613178

  The problem to be solved by the present invention is to provide a display body and an article having a high design property and a clear visual effect in a display body that combines a moiré image and light emitted from an uneven structure such as a diffraction grating. is there.

  A display body according to claim 1 of the present invention is provided on one surface of a substrate, and a lens forming region in which a plurality of lenses are arranged at least in a pattern such as letters, symbols, and patterns, And a lens forming layer having a non-lens forming area in which at least a part is arranged in a pattern such as a character, a symbol, and a pattern, and the lens is not arranged, and each focal position of the plurality of lenses A display layer provided with a lens display region in which a plurality of display elements are arranged in a pattern such as the same characters, symbols, and patterns as the lens formation region at intervals different from the arrangement pitch of the plurality of lenses, Provided in the display layer located below the non-lens forming region, and having a concavo-convex structure composed of a plurality of concave or convex portions arranged in a pattern such as the same characters, symbols, and patterns as the non-lens forming region, this It is provided with a non-lens display region having a light reflecting layer on at least a part of the convex structure.

  In the display according to claim 2 of the present invention, at least a part of the concavo-convex structure is a diffraction grating structure in which a plurality of concave portions or convex portions are periodically arranged, or a plurality of linear convex portions and / or concave portions. A directional scattering structure arranged randomly, or a plurality of recesses or projections arranged two-dimensionally, the distance between the centers of the adjacent recesses or projections has a constant period, and 400 nm or less, the height of the concave portion or convex portion in the direction perpendicular to the substrate surface is 200 nm to 600 nm, and the surface area of the single concave portion or convex portion is the single concave portion or convex portion. More than 1.5 times the occupied area required to arrange on the surface of the relief structure forming layer, and displays black or dark gray when viewed from the normal direction under normal illumination conditions and under specific conditions And having a diffracted light emission function, or a plurality of convex portions whose upper surface is substantially parallel to the base material, or a plurality of concave portions whose bottom surface is substantially parallel to the base material, and substantially parallel to the base material surface. The plurality of convex portions or concave portions have a long side and a short side length of 0.3 μm or more and 10 μm or less, respectively, and the height of the convex portion or the concave portion. Is 0.1 μm or more and 0.5 μm or less, and the protrusions or recesses are arranged in an orderly or non-ordered manner in the region, and the area occupied by the protrusions or recesses in the region is 20% or more and 80% or less. It is characterized by comprising at least one of the following structures.

  In the display according to claim 3 of the present invention, the display element includes a plurality of concave portions or convex portions, the distance between the centers of the adjacent concave portions or convex portions has a constant period, and is 400 nm or less. The height of the concave portion or convex portion in the direction perpendicular to the substrate surface is 200 nm to 600 nm, and the surface area of the single concave portion or convex portion is the relief structure of the single concave portion or convex portion. More than 1.5 times the occupied area required for arrangement on the surface of the formation layer, and displays black or dark gray when viewed from the normal direction under normal illumination conditions and diffracted light emission function under specific conditions And a plurality of recesses or projections as light scattering elements, and a light scattering structure that causes light scattering with respect to incident light is alternately repeated. At least a portion of the is characterized in that by arranging a light-reflecting layer.

  The display body according to claim 4 of the present invention is characterized in that the display element comprises a print pattern exhibiting at least one color.

  The display body according to claim 5 of the present invention is characterized in that the plurality of display elements are composed of a plurality of cells, and the length of one side of the cell is 145 μm or less.

  The display body according to claim 6 of the present invention is characterized in that an adhesive layer is provided between the display layer and the lens forming layer.

  An article according to claim 7 of the present invention includes the display body according to any one of claims 1 to 6.

  According to the present invention, a lens forming layer including a lens forming region in which a plurality of lenses are disposed and a non-lens forming region in which no lens is disposed, and a lower portion of the lens forming region, the focal length of the lens It is possible to provide a display body including a lens display region disposed at a position and a non-lens display region disposed at a lower portion of the non-lens formation region and partially or entirely provided with a light reflection layer.

  Furthermore, in the display body of the present invention, a plurality of lenses are regularly arranged so as to express patterns such as characters, symbols, and patterns, and various patterns are expressed in the lens formation region, so that the design of the display body Has improved. In addition, the non-lens forming area can be arranged to express patterns such as characters, symbols, and patterns, and an arbitrary pattern can be expressed as a display body by combining the lens forming area and the non-lens forming area. It becomes possible.

  As a feature of the present invention, a lens display area is disposed at the focal length of the lens in the same pattern as the lens formation area, and is non-lens formed below the non-lens formation area in the same pattern as the non-lens formation area. The lens display area is arranged. The lens display area is arranged by arranging a plurality of display elements at a pitch different from the arrangement pitch of the lenses, so that an observer who observes the display body can arrange the arrangement pitch of the lenses and the arrangement of the plurality of display elements. It is possible to observe a moire image resulting from a pitch shift.

  Further, the non-lens display area disposed below the non-lens formation area has a concavo-convex structure, and the concavo-convex structure forms a diffraction grating or a light scattering structure, so that the light emitted from the concavo-convex structure is Observe the iridescent diffracted light emitted from the diffraction grating and the white scattered light emitted from the light scattering structure by passing through the non-lens formation region and reaching the eyes of the observer of the display body. Is possible.

  The uneven structure in the non-lens display area is called a so-called structural color, which selectively emits light of a specific wavelength, or displays black or dark gray when observed from the normal direction. It is also possible to use a structure having a diffracted light emission function under a specific condition or a structure that emits scattered light having directivity. For this reason, the non-lens display area expresses various colors and has an effect of improving the design of the display body.

  In the lens formation region of the present invention, it occurs due to a shift between the arrangement pitch of the plurality of display elements forming the lens display region at the position of the focal length of the lens and the arrangement pitch of the plurality of lenses arranged in the lens formation region. Moire images can be observed, and in the non-lens formation area, it is possible to observe the light emitted from the concavo-convex structure that forms the non-lens display area at the bottom of the non-lens formation area. The observer who observes the body can observe both the moire image in the lens formation area and the image in the non-lens formation area in one display body, and realizes a display body with excellent expression and design. doing.

The top view which shows typically the structure of the display body which concerns on embodiment of this invention. The schematic diagram which shows the vertical side surface along the XX 'line | wire in FIG. The figure which showed the relationship between the focal distance of a convex lens, and a curvature radius. The figure which showed the image at the time of observing the lens formation area of a display body. The schematic diagram which shows the vertical side surface of an uneven structure. The schematic diagram which shows roughly the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as an uneven structure. The longitudinal side view which shows typically the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted for an uneven structure. The top view which shows typically the structure of the display body in the Example of this invention. The schematic diagram which shows the vertical side surface along the XX 'line | wire in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise described, the present invention is not limited to these forms.

  1 and 2 schematically show the configuration of the display body 1 according to the present embodiment. The display body 1 is configured such that a lens formation region 2 in which a plurality of lenses 4 are regularly arranged and a non-lens formation region 3 in which the lenses 4 are not arranged express a flower pattern, These are provided on the lens forming layer 7. The lens forming layer 7 is provided on the base material 5.

  As the base material 5, a material having high light transmittance is desirable. For example, a film or sheet made of a resin having high light transmittance such as polyethylene terephthalate (PET), polycarbonate (PC), triacetyl cellulose (TAC), and the like are suitable.

  Furthermore, the base material 5 may have a single layer structure or a multilayer structure. Furthermore, treatments such as antireflection treatment, low antireflection treatment, hard coat treatment, antistatic treatment, and antifouling treatment may be performed.

  The lens 4 preferably has a lens shape such as a microlens or a prism. In particular, by using a microlens, it is possible to speak the effect that an observable moire image moves in the vertical and horizontal directions, and the design of the display body 1 can be improved. This effect will be described later.

  As a material for forming the lens 4, for example, a thermoplastic resin material such as an acrylic resin, a polycarbonate resin, a styrene resin, and an acrylic / styrene copolymer resin or an ultraviolet curable resin can be used. Further, as a material of the lens forming layer 7, an inorganic material containing a silicate may be used instead of using a resin.

  A plurality of lenses 4 are regularly arranged, and are regularly arranged on one main surface of the lens forming layer 7. The plurality of lenses 4 can be arranged in a lattice shape such as a square lattice, a rectangular lattice, or a triangular lattice, for example. Here, as an example, the plurality of lenses 4 are arranged in a substantially square lattice shape.

  As a manufacturing method of these lens arrays, it can be formed by pressing a mold provided with a plurality of recesses against a resin. For example, the lens 4 is a method in which a lens having a concave portion having a shape corresponding to a lens array in which a plurality of lenses 4 are arranged on the lens forming layer 7 is pressed while applying heat, that is, heat embossing. Obtained by processing method.

  A display element 6 is disposed below the lens formation region 2 and at the position of the focal length F of the lens 4. When the plurality of lenses 4 are convex lenses such as a spherical lens and an aspherical lens, the focal length F of the lens 4 can be obtained from the radius of curvature R of the lens 4 and the refractive index n ′.

FIG. 3 is a schematic diagram illustrating paraxial imaging with a convex lens (refractive sphere). The focal length F of the convex lens when the refractive index on the observer side is n, the refractive index of the convex lens is n ', the vertex of the convex lens is A, and the distance (curvature radius) from the vertex A to the center of curvature of the lens is R. The distance F from the vertex A to the display element 6 can be obtained by the following formula 1.

  Usually, since the observer is in the air layer of n = 1.0, if the refractive index n ′ and the curvature radius R of the convex lens are determined, the distance F from the vertex A of the convex lens to the display element 6 is naturally determined. It becomes.

  The display element 6 is provided on the display layer 8. That is, in the display layer 8, the lens display area 10 only needs to express characters, symbols, designs, and the like by a plurality of display elements 6 using a print pattern or the like. At that time, the imaging position of the moire reproduction image 30 (see FIG. 4) that can be displayed is determined by the difference between the arrangement pitch of the plurality of lenses 4 and the arrangement pitch of the display elements 6.

  FIG. 4 is a diagram showing an image when the lens forming region 10 of the display body 1 is observed. When the observer 31 observes the display body 1 illuminated by the illumination light source 12, a real image that is emitted from the plurality of display elements 6 arranged in the display layer 8 and light is formed through the plurality of lenses 4 in a hollow shape. Can be observed.

  This is because light emitted from one point on the focal plane (point light source) of the lens travels as parallel light with the size of the lens in a direction connecting the position of the point light source and the center of the lens with a straight line. Based on this principle, if light is collected from several parallel light beams at one point in the three-dimensional space and the light beam is observed from the traveling direction after the light beams are collected at one point, the light beam group is collected for the observer 31. It seems that light is emitted from one point.

  If the points are connected on the surface using the above principle, a three-dimensional image can be projected in a three-dimensional space. The resolution (pixels) at that time is the size of the lens diameter.

As shown in FIG. 4, the arrangement pitch of the lenses is ΔX, the arrangement pitch of the display elements 6 is ΔP, the distance from the vertex A of the lens to the display elements 6, that is, the focal length is F, and the moiré reproduced image 30 from the display elements 6. When the distance up to S is S, there is a relationship as shown in Equation 2 below.

  If the above formula 2 is used, the distance at which the image jumps out, that is, the imaging distance S is determined, and if the lens arrangement pitch ΔX and the focal length F are set, the arrangement pitch ΔP of the display elements 6 is naturally obtained.

  When the above formula 2 is actually calculated, it can be seen that the longer the imaging distance S, the smaller the difference between ΔP and ΔX must be.

  As described above, since the display body 1 of the present invention has a lens diameter of one pixel, it is possible to obtain a finer moire reproduction image 30 when the lens arrangement pitch ΔX is smaller. Become.

  In addition, a non-lens display area 20 having a concavo-convex structure 9 is disposed on the display layer 8 located below the non-lens formation area 3. The concavo-convex structure 9 may be a diffraction grating in which a plurality of concave portions or convex portions are periodically arranged. By varying the spatial frequency of the diffraction grating and the like, various wavelengths can be emitted as diffracted light, and an expression of rainbow colors in the non-lens formation region 3 can be realized.

  Further, the concavo-convex structure 9 disposed in the display layer 8 located below the non-lens forming region 3 is a directional scattering structure in which convex portions and / or concave portions are randomly arranged as shown in FIG. Also good. In this case, the directional scattering structure can emit scattered light exhibiting white as diffracted light. Therefore, white expression in the non-lens formation region 3 is possible.

  Furthermore, the concavo-convex structure 9 disposed in the display layer 8 located below the non-lens forming region 3 is composed of a plurality of concave or convex portions arranged two-dimensionally, and between the centers of the adjacent concave or convex portions. The distance has a constant period and is 400 nm or less, and the height of the concave portion or convex portion in the direction perpendicular to the surface of the substrate 5 is 200 nm to 600 nm. When the surface area of the portion is 1.5 times or more of the occupied area required to arrange the single concave portion or convex portion on the surface of the relief structure forming layer, and observed from the normal direction under normal illumination conditions Further, it may be a structure that displays black or dark gray and has a diffracted light emission function under specific conditions. In FIG. 6, the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as the uneven structure 9 is shown roughly.

  Here, the normal illumination condition means that the light from the illumination light source 12 is incident on the surface of the concavo-convex structure 9 substantially vertically on the display body 1 under illumination light such as a fluorescent lamp in a general room, and observed. The person 31 visually observes the display body 1 and the light from the illumination light source 12 is incident on the surface of the concavo-convex structure 9 substantially perpendicularly to the display body 1 under illumination light such as sunlight. The conditions for the person 31 to observe the display body are shown. Here, normal illumination light refers to illumination light under such normal illumination conditions.

  The specific condition means a condition in which light from the illumination light source 12 is incident on the surface of the display body 1 substantially horizontally, that is, at a steep angle, and the observer 31 observes the display body 1 by visual observation. To do.

  Therefore, when the display body 1 is observed from the normal direction, the non-lens formation region 3 looks black. In addition, here, for black, for example, when the display body 1 is irradiated with light from the normal direction and the intensity of specular reflection light is measured, all the light components having a wavelength in the range of 400 nm to 700 nm are measured. It means that the reflectance is 25% or less. Therefore, the non-lens forming region 3 looks as if it is a black printed layer. The reflectivity varies depending on the observation environment and individual differences, but if it is approximately 25% or less, dark gray lightness and low color are perceived, and if it is 10% or less, a sufficient antireflection effect is obtained. Is obtained and black color is perceived.

  In the concavo-convex structure 9 shown in FIG. 6, a plurality of concave portions or convex portions are arranged in a honeycomb shape at a predetermined center distance. This structure can reduce the area occupied by the plurality of concave portions or convex portions as compared with the case where they are arranged in a matrix, and can more efficiently prevent light reflection.

Further, in the display layer 8 including the concavo-convex structure 9, by setting the distance between the centers of adjacent concave portions or convex portions to 400 nm or less, the illumination light can be transmitted for all wavelengths within the range of 400 nm to 700 nm which is the visible light wavelength. Regardless of the incident angle, it is possible to prevent the diffracted light from being emitted in the normal direction. Even if the illumination light is 89 ° from the normal direction, the light of 400 nm finally travels in the front direction, so that the diffracted light with sufficient intensity under all illumination conditions for all visible wavelengths is recessed or There is no longer any emission in the front direction from the projection. That is, since the diffracted light is emitted at an angle greatly different from the normal direction, the diffracted light can be observed only when observed with a large inclination from the normal direction.
Here, the center-to-center distance means a distance P between the central axes of adjacent concave or convex portions as shown in FIG.

  Further, when the distance between the centers of adjacent concave portions or convex portions is 250 nm or more and 300 nm or less, at least the diffracted light of the red component is not observed in the relief in the visible wavelength range of 400 to 700 nm. That is, as in the case where the center-to-center distance is 400 nm or less, the diffracted light from the relief structure forming layer is not emitted in the normal direction of the display body 1, but the diffracted light is emitted at an angle significantly different from the normal direction. The visible wavelength of red light is not diffracted, but only the visible light wavelengths of blue and green are diffracted, so it does not change to iridescent as in the conventional diffraction grating, but only the colors similar to blue and green. It becomes possible to display.

  Moreover, it is preferable that the height of the concave portion or the convex portion in the direction perpendicular to the surface of the substrate 5 is 200 nm to 600 nm. When the height is smaller than 200 nm, the reflectance is increased as in the case of the flat surface, so that sufficient low reflectivity and low scattering cannot be imparted, and when the height is larger than 600 nm, It becomes difficult to replicate the uneven structure 9. Here, the height in the direction perpendicular to the surface of the base 5 of the concave portion or convex portion means the height H of the concave portion or convex portion as shown in FIG.

  By using the concavo-convex structure 9 as described above, the non-lens formation region 3 expresses black on the front surface, and can be observed with diffracted light by being largely inclined.

  Further, the concavo-convex structure 9 disposed in the display layer 8 positioned below the non-lens formation region 3 has a plurality of convex portions whose upper surface is substantially parallel to the base material 5 or a bottom surface substantially parallel to the base material 5. It consists of a region in which a plurality of concave portions and a flat portion substantially parallel to the surface of the substrate 5 are arranged, and the plurality of convex portions or concave portions have a long side and a short side length of 0.3 μm or more, respectively. And the height of the convex part or the concave part is 0.1 μm or more and 0.5 μm or less, and the convex part or the concave part is arranged orderly or non-ordered in the region, The area occupied by the portion or the recess may be 20% or more and 80% or less. In FIG. 7, the example of the arrangement pattern of the recessed part or convex part which can be employ | adopted as the uneven structure 9 is shown roughly.

  Since the concavo-convex structure 9 has substantially the same height (or depth of the concave portion) and is substantially parallel to the surface of the base material 5, it prevents the diffraction efficiency of light having a specific wavelength from being lowered. Therefore, it is possible to display a highly saturated color.

  Moreover, since the concavo-convex structure 9 emits diffracted light with respect to many azimuth angles, a color composed of a plurality of wavelengths can be observed even if the position of the light source and the observation direction are slightly changed. For this reason, it is possible to avoid or reduce the phenomenon that the display color changes to iridescent as in the conventional diffraction grating.

  The lengths of the long side and the short side of the convex portion or the concave portion that can be adopted for the concavo-convex structure 9 are 0.3 μm or more and 10 μm or less, respectively. If the structure has a size in this range, visible light can be sufficiently diffracted. When it is smaller than 0.3 μm, processing becomes difficult and it becomes difficult to emit visible light, and it becomes easy to function as an antireflection structure. On the other hand, if it is larger than 10 μm, it becomes difficult to diffract, and at the same time, diffracted light is emitted near the direction in which the illumination light is incident.

  Moreover, it is preferable that the occupation area of a convex part or a recessed part is 20% or more and 80% or less. When the width D of the convex portion or the concave portion is half of the pitch P, the diffraction efficiency becomes the highest. Therefore, the brightest display image can be obtained when the area occupied by the protrusions or recesses is about 50%, and most desirably, the diffraction efficiency decreases with increasing distance from 50% if it is about 20% or more and 80% or less. Although the emitted light becomes dark, it is possible to visually recognize a display image composed of light having a plurality of wavelengths. The diffraction efficiency when the occupied area is 20% and 80% is about 30% of the brightness of 50%.

  When the area occupied by the convex portion or the concave portion is smaller than 20% or larger than 80%, sufficient brightness cannot be obtained, and it becomes difficult to obtain a sufficient eye-catching effect.

  Moreover, it is preferable that the height of a convex part or the depth of a recessed part is the range of 0.1 micrometer or more and 0.5 micrometer or less. In Formula 2, assuming that the pitch P and the grating line width D are constant, when light having a wavelength in the visible light range is incident at an incident angle θ (a range greater than 0 ° and less than 90 °), the diffraction efficiency is increased. The highest height of the convex portion or the depth of the concave portion is in the range of 0.1 μm to 0.5 μm. The conditions for the highest diffraction efficiency are repeated even when the value is larger than that, but for manufacturing, the height of the convex portion or the depth of the concave portion is easier to manufacture because the one that is as shallow as possible is easier. The conditions of 0.1 μm or more and 0.5 μm or less that can obtain high diffraction efficiency at a shallow value are desirable.

  In addition, when the height of the convex portion or the depth of the concave portion is shallower than 0.1 μm, it becomes difficult to stably produce the same quality at the time of production, and when deeper than 0.5 μm, it is fine and deep. It becomes difficult to precisely transfer and mold the structure.

  By using the concavo-convex structure 9 as shown in FIG. 7, it is possible to emit a so-called structural color that exhibits a color in which specific wavelengths are mixed regardless of the angle of observation. Therefore, the non-lens formation region 3 can widely observe a display color having a specific color.

  The concavo-convex structure 9 described so far can be easily formed with high accuracy by using a fine processing apparatus such as an electron beam (EB) drawing apparatus or a stepper. In particular, when fabricated by EB drawing, a concavo-convex structure can be fabricated using minute cells as pixels.

  Then, it becomes possible to arrange various uneven structures 9 arranged on the display layer 8 with very high accuracy.

  Thereby, the color that can be observed from the non-lens forming region 3 is composed of a rainbow color by a diffraction grating, white by a scattering structure, and a plurality of concave or convex portions arranged two-dimensionally, and the center of the adjacent concave or convex portions. The distance between them has a constant period and is 400 nm or less, the height of the concave portion or convex portion in the direction perpendicular to the surface of the substrate 5 is 200 nm to 600 nm, and the single concave portion or convex portion When the surface area of the portion is 1.5 times or more of the occupied area required to arrange the single concave portion or convex portion on the surface of the relief structure forming layer, and observed from the normal direction under normal illumination conditions Black and diffracted light with a structure that displays black or dark gray and has a diffracted light emission function under specific conditions, or a plurality of convex portions or bottom surfaces whose top surface is substantially parallel to the base material 5 A plurality of concave portions that are substantially parallel to each other and a region that is configured by arranging a flat portion that is substantially parallel to the surface of the base material 5, and the lengths of the long sides and the short sides of the plurality of convex portions or concave portions are 0 respectively. 3 μm or more and 10 μm or less, and the height of the convex portion or the concave portion is 0.1 μm or more and 0.5 μm or less, and the convex portion or the concave portion is arranged orderly or non-ordered in the region, Various expressions such as a structural color exhibiting a characteristic color due to a structure in which the area occupied by the convex portion or the concave portion in the inside is 20% or more and 80% or less are possible, and the design of the display body 1 can be improved.

  In addition, when EB drawing is used, the size of one cell can be set to about 145 μm, and when an observer with a visual acuity of 1.0 observes the display body 1 from a distance of 50 cm, the size is distinguished. It is not possible, that is, the image can be displayed with fineness below the resolution of the human eye. Thereby, a sufficiently high-definition image can be displayed.

  The uneven structure 9 may be formed on some base material. For example, a film or sheet made of a resin having optical transparency such as polyethylene terephthalate (PET), polycarbonate (PC), or triacetyl cellulose (TAC) is preferable. As a material of the substrate 5, an inorganic material such as glass may be used.

  As a material for forming the concavo-convex structure 9, for example, a light transmissive resin 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, the display layer 8 having the concavo-convex structure 9 on one surface can be easily produced by transfer using an original plate on which the concavo-convex structure 9 is formed. Can do.

  The display layer 8 only needs to have a sufficient transmittance for at least some wavelengths of visible light, and a dye or the like that absorbs a specific wavelength band may be added. In that case, the portion visible through the display layer 8 appears colored.

  At least a part or all of the concavo-convex structure 9 is provided with a light reflecting layer 11. The light reflecting layer 11 plays a role of increasing the reflectance of the interface of the display layer 8 provided with the uneven structure 9. As a material of the light reflecting layer 11, for example, a metal material having a high reflectance such as aluminum, silver, and an alloy thereof can be used. In the display body 1 of the present invention, the light reflecting layer 11 is provided so as to cover at least a part of the uneven structure 9, but the uneven structure 9 not covered with the light reflecting layer 11 is made of a resin having a refractive index close to that. As a result of being coated, the optical function is not exerted on the assumption that there is no uneven structure.

  As a method for producing the light reflecting layer 11 using a metal material, for example, it can be formed by a vapor deposition method such as a vacuum evaporation method or a sputtering method. The light reflecting layer 11 partially covering the display layer 8 is formed, for example, by forming a thin film by vapor deposition and dissolving a part thereof in a chemical or the like, or adhesion between the thin film and the display layer 8. It can be obtained by peeling off a part of the thin film with an adhesive material exhibiting stronger adhesive strength to the previous thin film. The light reflecting layer 11 partially covering one main surface of the display layer 8 can also be formed by a vapor deposition method using a mask. If the vapor deposition method is used, it is possible to easily control the thickness in the present invention and form a region where the light reflecting layer 11 is not provided.

  In the display body 1, the adhesive layer 13 may be disposed between the lens forming layer 7 and the display layer 8 so as not to be separated. At this time, the distance (focal length F) from the lens 4 to the display element 6 can be adjusted by the thickness of the adhesive layer 13. If the focal length F is deviated, there are problems that the observed moire reproduction image 30 is blurred or the contrast is lowered. In this sense, it is important to provide the adhesive layer 13 and set the focal length F appropriately.

  As described above, it has been described that the display element 6 constituting the lens display region 10 may be produced by a printing pattern using ink or the like, but the uneven structure 9 can also be used for the display element 6.

  In that case, it is preferable to arrange the concavo-convex structure as shown in FIG. 5 and the concavo-convex structure as shown in FIG. 6 at the position of the focal length F of the lens 4. At this time, the structure as shown in FIG. 5 and the structure as shown in FIG. 6 are alternately arranged. The repetition pitch may be a pitch slightly different from the lens arrangement pitch ΔX.

  As described above, the repetition pitch can be determined by setting the lens arrangement pitch ΔX, the focal length F of the lens 4, and the imaging distance S of the moire reproduction image 30 using Equation 2.

  As described above, the effect of using the uneven structure 9 for the display element 6 can be expressed in white in the uneven structure as shown in FIG. 5, and expressed in black in the uneven structure as in FIG. Is possible. A moire reproduction image can be observed in the lens formation region 2 due to a moire enlargement phenomenon in which the uneven structure is combined with a plurality of lenses 4.

  The concavo-convex structure 9 as described above can be produced by electron beam drawing or the like, and a highly accurate arrangement according to the arrangement pitch of the lenses 4 can be realized.

  In addition, the display body 1 of the present invention may be bonded and pressure-bonded in the form of a transfer foil or a sticker through an adhesive layer or the like.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, these are illustrations and do not limit this invention at all.

  8 and 9 show the display 1 according to the first embodiment of the present invention. The base material 5 was a polyethylene terephthalate (PET) film, and the lens 4 was molded from an ultraviolet curable resin. The display layer 8 is made of an ultraviolet curable resin coated on the substrate 5. A PET film was used as the substrate 5.

  In the display layer 8, a concavo-convex structure 9 and a display element 6 (a portion written by a square in the drawing) are formed at a position of the focal length F of the lens 4 below the lens formation region 2. As the uneven structure 9, a directional scattering structure and a diffraction grating were used.

  Even if the concavo-convex structure 9 and the printing pattern formed on the display layer 8 disposed below the lens formation region 2 are arranged so as to form a parallax image corresponding to each lens 4, The arrangement pitch ΔX of 4 and the arrangement pitch ΔP of the display elements 6 are slightly shifted. As a method of forming the concavo-convex structure 9, a laser exposure interference system or the like may be used, or may be formed by electron beam drawing or the like.

  As the concavo-convex structure 9 of the display layer 8 disposed below the non-lens formation region 3, a structure as shown in FIG. 7 was used. At this time, the pitch P of the concavo-convex structure 9 was about several tens of μm, and the depth H was about 300 nm.

  Further, the display layer 8 and the base material 5 are bonded together by the adhesive layer 13. The focal length F of the lens 4 was set to about 40 μm by adjusting the thickness of the adhesive layer 13.

  As the light reflection layer 11, an aluminum vapor deposition layer was formed by a vacuum vapor deposition method. The thickness of the light reflecting layer 11 is about 50 nm.

  The radius of curvature of the lens 4 is about 20 μm, and the focal length F is about 40 μm. The total thickness of the display body 1 is also about 50 μm. Of course, in addition to this dimension, the radius of curvature can be changed.

  When the display body 1 as shown in FIG. 8 is observed, a moire reproduction image can be observed in the lens forming region 2 portion. In the non-lens formation region 3, the display image by the diffracted light can be observed by the concavo-convex structure 9 disposed in the lower part, so that the moiré reproduction image and the color development by the diffracted light can be observed simultaneously.

  DESCRIPTION OF SYMBOLS 1 ... Display body, 2 ... Lens formation area, 3 ... Non-lens formation area, 4 ... Lens, 5 ... Base material, 6 ... Display element, 7 ... Lens formation layer, 8 ... Display layer, 9 ... Uneven structure Lens display area, 11 ... light reflection layer, 12 ... illumination light source, 13 ... adhesive layer, 20 ... non-lens display area, 30 ... moire reproduction image, 31 ... observer, F ... focal length, R ... curvature radius.

Claims (7)

A lens forming region provided on one surface of the base material, in which a plurality of lenses are arranged at least in a pattern such as letters, symbols, and patterns, and at least partially letters, symbols, patterns, etc. A lens-forming layer provided with a non-lens-forming region in which the lens is not provided,
A lens display in which a plurality of display elements are arranged in a pattern such as the same characters, symbols, and patterns as those in the lens formation region at intervals different from the arrangement pitch of the plurality of lenses. A display layer with a region;
Provided in the display layer located below the non-lens forming region, and having a concavo-convex structure composed of a plurality of concave or convex portions arranged in a pattern such as the same characters, symbols, and patterns as the non-lens forming region, A non-lens display area having a light reflecting layer in at least a part of the uneven structure;
The display body characterized by comprising. At least a part of the uneven structure is
A diffraction grating structure in which a plurality of concave portions or convex portions are periodically arranged;
Alternatively, a directional scattering structure in which a plurality of linear convex portions and / or concave portions are randomly arranged,
Alternatively, it is composed of a plurality of recesses or projections arranged two-dimensionally, the distance between the centers of the adjacent recesses or projections having a constant period is 400 nm or less, and the recesses or projections The height in the direction perpendicular to the substrate surface is 200 nm to 600 nm, and the surface area of the single concave portion or convex portion is arranged to arrange the single concave portion or convex portion on the surface of the relief structure forming layer. 1.5 times or more of the required area, a structure that displays black or dark gray when viewed from the normal direction under normal illumination conditions and has a diffracted light emission function under specific conditions,
Or the area | region which the several convex part whose upper surface is substantially parallel to the said base material, or the several recessed part whose bottom face is substantially parallel to the said base material, and the flat part substantially parallel to the said base material surface are arrange | positioned, and was comprised. The plurality of convex portions or concave portions have a long side and a short side length of 0.3 μm or more and 10 μm or less, respectively, and the height of the convex portion or the concave portion is 0.1 μm or more and 0.5 μm. The convex portions or the concave portions are arranged in an orderly or non-ordered manner in the region, and the occupation area of the convex portions or the concave portions in the region is 20% or more and 80% or less,
The display body according to claim 1, comprising at least one of the following. The display element is:
It is composed of a plurality of concave portions or convex portions, and the distance between the centers of the adjacent concave portions or convex portions has a constant period and is 400 nm or less, and the direction perpendicular to the substrate surface of the concave portion or convex portion The surface area of a single recess or projection is 1.5 times or more the occupation area required for arranging the single recess or projection on the surface of the relief structure forming layer. When viewed from the normal direction under normal illumination conditions, black or dark gray is displayed and a structure having a diffracted light emission function under specific conditions, and a plurality of concave or convex portions as light scattering elements, The light scattering structure that causes light scattering with respect to incident light has a shape that is alternately repeated, and at least a part of the plurality of concave portions or convex portions is provided with a light reflecting layer. Display of claim 1 wherein.   The display body according to claim 1, wherein the display element includes a print pattern exhibiting at least one color.   The display body according to claim 1, wherein the plurality of display elements include a plurality of cells, and a length of one side of the cells is 145 μm or less.   The display body according to claim 1, wherein an adhesive layer is provided between the display layer and the lens forming layer.   An article comprising the display body according to any one of claims 1 to 6.

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