JP2009086210A - Display body and article with label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attain high productivity and display as planned, even when a display area is wide. <P>SOLUTION: The display 10 is provided with: a diffraction structure layer including a plurality of unit areas arrayed regularly in one main face, provided with an irregular pattern DP constituting diffraction structure in one part of each of the plurality of unit areas, and constituted to make the structures of the irregular patterns DP equal each other in the plurality of unit areas, and a plurality of lenses 122 arrayed regularly, and the irregular patterns DP provided in the plurality of unit areas and the plurality of lenses 122 are arranged to display one ore more of magnified images of diffraction images, as a composite image provided by composing the plurality of diffraction images displayed respectively by the irregular patterns DP provided in the plurality of unit areas, by a moire effect generated by overlapping the arrays. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display technique using a diffractive structure.

  When a diffractive structure such as a diffraction grating and a hologram is configured with a concavo-convex pattern as described in Patent Document 1, it is necessary to form a pattern having a line width of the order of micrometers or nanometers. The planar shape and cross-sectional shape of the concavo-convex pattern have a great influence on the performance of the diffractive structure. Therefore, high accuracy is required to form the concavo-convex pattern.

  In the manufacture of a display body including a concavo-convex pattern as a diffractive structure, generally, a mold is manufactured and the concavo-convex pattern of the mold is transferred to a resin layer. Specifically, first, electron beam drawing is performed on the resist layer to obtain an original plate including a concavo-convex pattern made of resin. Next, a mold including an inverted pattern of the concavo-convex pattern provided on the original plate is obtained by electroforming. Thereafter, the mold pattern is transferred to a thermoplastic resin or ionizing radiation curable resin layer to produce a plurality of plates, and a plurality of dies are produced from these plates by electroforming. By transferring the concavo-convex pattern of the mold thus obtained to the resin layer, a resin layer having a concavo-convex pattern on one main surface can be obtained.

  Electron beam drawing is suitable for forming a fine pattern. However, in electron beam drawing, if the pattern area increases, more time is required for drawing. Therefore, according to electron beam drawing, it is difficult to manufacture a display body having a large display area with high productivity.

  In addition, in electron beam drawing, it is necessary to stabilize the operation of the apparatus and its surrounding environment from the start to the end of drawing. It is very difficult to stabilize the operation of the apparatus and the surrounding environment for a long time. That is, the larger the display area, the higher the possibility that the pattern shape accuracy will be insufficient.

  In addition, if the display area is large, there is a high possibility that a missing portion will occur in the pattern during pattern transfer from the original plate to the mold and pattern transfer from the mold to the resin layer, and from the mold of the resin layer. There exists a tendency for mold release property to become inadequate. This problem is particularly noticeable when forming a pattern with a line width of the order of nanometers or when forming a pattern having a cross-sectional shape with a high aspect ratio.

As described above, when the display area of the display body is enlarged, it becomes difficult to realize high productivity and to form the uneven pattern with high shape accuracy. If the shape accuracy of the concavo-convex pattern is insufficient, the designed diffraction image cannot be displayed on the display body.
JP-A-10-123919

  An object of the present invention is to make it possible to easily achieve high productivity and display as designed even when the display area is large.

  According to the first aspect of the present invention, one main surface includes a plurality of regularly arranged unit regions, and a concavo-convex pattern constituting a diffractive structure is provided in each of the plurality of unit regions. Each of the plurality of unit regions includes a diffractive structure layer having the same concave-convex pattern structure and a plurality of regularly arranged lenses, and a lens array facing the diffractive structure layer, The concavo-convex pattern provided in the unit region and the plurality of lenses have a plurality of diffracted images respectively displayed by the concavo-convex pattern provided in the plurality of unit regions due to a moire effect caused by superposition of their arrangement. There is provided a display body that is arranged so as to display one or more magnified images of the diffraction image as a composite image formed by combining.

  According to the second aspect of the present invention, one main surface includes a plurality of regularly arranged unit regions, and a concavo-convex pattern constituting a diffractive structure is provided in each of the plurality of unit regions. Each of the plurality of unit regions includes a diffractive structure layer having the same concave-convex pattern structure and a plurality of regularly arranged lenses, and a lens array facing the diffractive structure layer, The concavo-convex pattern provided in the unit area is regularly arranged and the arrangement is shifted in azimuth and / or pitch with respect to the arrangement of the plurality of lenses, or the arrangement provided in the plurality of unit areas. A display body is provided in which the concavo-convex pattern is irregularly arranged.

  According to a third aspect of the present invention, there is provided a labeled article characterized by including the display according to the first or second aspect and an article supporting the display.

  According to the present invention, even when the display area is large, high productivity and display as designed can be easily achieved.

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

  FIG. 1 is a perspective view illustrating a display body according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of the display body shown in FIG. FIG. 3 is a plan view schematically showing the display shown in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of the display shown in FIG. FIG. 5 is a plan view schematically showing a diffractive structure layer of the display shown in FIG.

  In these drawings, the X direction is a direction parallel to the main surface of the display body, the Y direction is a direction parallel to the main surface of the display body and intersects the X direction, and the Z direction is the X direction and This is a direction perpendicular to the Y direction. Here, the X direction and the Y direction are substantially orthogonal to each other, but they may intersect obliquely.

  As shown in FIGS. 1, 2, and 4, the display body 10 includes a diffractive structure layer 11 and a lens layer 12. The diffractive structure layer 11 and the lens layer 12 face each other, and are bonded via an adhesive layer 13 as shown in FIGS. 1 and 4. The front side of the display body 10 is the lens layer 12 side, and the back side is the diffractive structure layer 11 side.

  As shown in FIG. 4, the diffractive structure layer 11 includes a laminate of a base material 111 and an unevenness forming layer 112. The diffractive structure layer 11 may have a single layer structure or a multilayer structure.

  The substrate 111 is, for example, a film or sheet made of a resin such as polyethylene terephthalate (PET) and polycarbonate (PC). An inorganic material such as glass may be used as the material of the substrate 111. The substrate 111 may be transparent or opaque. The substrate 111 may have a single layer structure or a multilayer structure. The base material 111 may be subjected to processing such as antireflection processing, low antireflection processing, hard coating processing, antistatic processing, and antifouling processing. The substrate 111 can be omitted.

  The unevenness forming layer 112 covers one main surface of the substrate 111. The unevenness forming layer 112 may be transparent or opaque.

  One main surface of the diffractive structure layer 11, here, the main surface on the concave-convex forming layer 112 side, includes a plurality of unit regions arranged regularly. In FIG. 2, FIG. 3 and FIG. 5, the broken line BL represents the boundary of these unit regions.

  These unit regions can be arranged in a lattice shape such as a square lattice, a rectangular lattice, or a triangular lattice. Here, as an example, the unit regions are arranged in a substantially square lattice pattern.

  An uneven pattern DP shown in FIGS. 3 to 5 is provided in a part of each unit region. Each uneven pattern DP constitutes a diffractive structure such as a diffraction grating and a hologram. These concavo-convex patterns DP have the same structure and the same orientation.

The diffractive structure displays a diffracted image that causes a color change according to the incident direction of the illumination light and the observation direction. The color of the diffracted image can be controlled by the spatial frequency of the grooves constituting the diffractive structure, and the following equation is taken into consideration when designing the color.
mλ = d (sin θ _i ± sin θ)
Here, m represents the diffraction order, λ represents the wavelength of the illumination light, θ _i represents the incident angle of the illumination light, and θ represents the exit angle or diffraction angle of the m-th order diffracted light.

  In this display body 10, since the arrangement of the diffractive structure and the lens array face each other, it is necessary to consider the change in the optical path caused by the lens 122. That is, the display 10 is designed in consideration of the change in the optical path caused by the lens 122 in addition to the above equation.

  The uneven pattern DP is regularly arranged corresponding to the unit area. Here, as an example, as shown in FIG. 5, each concavo-convex pattern DP is located substantially at the center of the unit region.

  The concavo-convex forming layer 112 can be formed, for example, by pressing a mold provided with fine linear protrusions against the resin, as is done in the manufacture of surface relief holograms. For example, the concavo-convex forming layer 112 is a method in which a mold provided with linear protrusions is pressed against a thermoplastic resin layer formed on the substrate 111 while applying heat, that is, a hot embossing method. Is obtained. Alternatively, the concavo-convex forming layer 112 is formed by applying an ultraviolet curable resin on the base material 111 and irradiating the ultraviolet light from the base material 111 side while pressing the mold to cure the ultraviolet curable resin. It can also be formed by a method of removing.

  This mold is manufactured using, for example, an electron beam drawing apparatus. For example, first, electron beam drawing is performed on the resist layer to obtain an original plate including an uneven pattern made of resin. Next, a mold including an inverted pattern of the concavo-convex pattern provided on the original plate is obtained by electroforming. Thereafter, the mold pattern is transferred to a thermoplastic resin or ionizing radiation curable resin layer to produce a plurality of plates, and a plurality of dies are produced from these plates by electroforming. By transferring the concavo-convex pattern of the mold thus obtained to the resin layer, the concavo-convex formation layer 112 provided with the concavo-convex pattern DP on one main surface can be obtained.

  As a material of the unevenness forming layer 112, 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. As a material of the unevenness forming layer 112, an inorganic material containing a silicate may be used instead of using a resin.

  The surface of the diffractive structure layer 11 on which the concave / convex pattern DP is provided may be covered with a reflective layer 14 as shown in FIG. The reflective layer 14 increases the diffraction efficiency of the uneven pattern DP. The reflective layer 14 may be patterned. For example, only the uneven pattern DP may be covered. The reflective layer 14 can be omitted.

  The reflective layer 14 is a metal layer, for example. As a material for the metal layer, for example, aluminum, silver, or an alloy thereof can be used. The metal layer can be formed, for example, by a vapor deposition method such as a vacuum evaporation method or a sputtering method. When the reflective layer 14 made of metal or alloy is formed by vapor deposition, a thickness of about 30 to 100 nm is sufficient, for example.

The reflective layer 14 may be a single-layer or multilayer dielectric film. For example, when a transparent single-layer dielectric film is used as the reflective layer 14, there is a possibility that an object on the back side of the display body 10 can be visually recognized when the display body 10 is observed with the naked eye. When a multilayer dielectric film is used as the reflective layer 14, the display 10 can be given wavelength selectivity. Therefore, it is possible to obtain a visual effect different from the case where a metal deposition layer or a single-layer dielectric film is used as the reflective layer 14. The multilayer dielectric film is obtained by alternately depositing a high refractive index material such as zinc sulfide and a low refractive index material such as magnesium fluoride on the substrate 11.
As shown in FIGS. 1, 2, and 4, the lens layer 12 includes a transparent substrate 121 and a plurality of lenses 122.

  The transparent substrate 121 is, for example, a film or sheet made of a resin such as PET and PC. An inorganic material such as glass may be used as the material of the substrate 121. The transparent substrate 121 may have a single layer structure or a multilayer structure. The base material 121 may be subjected to processing such as antireflection processing, low antireflection processing, hard coat processing, antistatic processing, and antifouling processing. The substrate 121 can be omitted.

  The lenses 122 are regularly arranged on one main surface of the transparent substrate 121. For example, the lenses 122 can be arranged in a lattice shape such as a square lattice, a rectangular lattice, or a triangular lattice. Here, as an example, the lenses 122 are arranged in a substantially square lattice pattern.

  The lens 122 is a spherical lens, for example. The lens 122 may be an aspheric lens or a rectangular lens. Note that the spherical lens is a lens having a surface formed of a part of a spherical surface. An aspherical lens is a lens having a surface composed of a part of a spherical surface whose shape is slightly shifted. The rectangular lens is a lens having a rectangular or square cross section parallel to the Z direction, and forms, for example, a lattice or striped lens array when observed from a direction parallel to the Z direction.

  When the lens 122 is a convex lens such as a spherical lens or a specific spherical lens, a clearer image can be displayed on the display body 10 by shortening the distance from the focal point of the lens 122 to the concave-convex pattern DP. The distance from the focal point of the lens 122 to the concave-convex pattern DP can be controlled by, for example, the focal length of the lens 122 and / or the thickness of the substrate 121 and the like. Note that when the concave-convex pattern DP is positioned at the focal point of the lens 122 and another pattern is provided at a position deviated from the focal point, an image with a sense of depth can be displayed on the display body 10.

  When the lens 122 is a rectangular lens and these constitute a lens array having a lattice shape or a stripe shape when observed from a direction parallel to the Z direction, there is no focal point. Therefore, in this case, it is not necessary to strictly control the distance from the lens array to the concave / convex pattern DP.

  The lens array can be formed, for example, by pressing a mold having a plurality of recesses against the resin. For example, the lens array is a method in which a mold provided with a concave portion corresponding to the lens 122 is pressed against a thermoplastic resin layer formed on the substrate 121 while applying heat, that is, heat embossing. Obtained by law. Alternatively, the lens array is a method in which an ultraviolet curable resin is applied onto the base material 121, the ultraviolet curable resin is irradiated from the base material 121 side while the mold is pressed against the base 121, and then the mold is removed. It is also possible to form by.

  As the material of the lens array, for example, thermoplastic resin materials such as acrylic resins, polycarbonate resins, styrene resins, and acrylic / styrene copolymer resins, or ultraviolet curable resins can be used. As a material for the lens array, an inorganic material containing a silicate may be used instead of using a resin. The material of the lens array may be higher in viscosity than the material of the unevenness forming layer 112.

  The adhesive layer 13 is transparent and bonds the diffractive structure layer 11 and the lens layer 12 together. As a material of the adhesive layer 13, for example, an ultraviolet curable resin can be used.

  The adhesive layer 13 can be omitted. In this case, the diffractive structure layer 11 and the lens layer 12 may be integrated using a fixture. When the adhesive layer 13 is omitted, an air layer is generated between the diffractive structure layer 11 and the lens layer 12. Therefore, even if the reflective layer 14 is omitted, high diffraction efficiency can be easily achieved.

  In the display body 10, as shown in FIG. 3, the concave / convex pattern DP is regularly arranged corresponding to the unit area, and the lenses 122 are regularly arranged at the same period as the arrangement of the concave / convex pattern DP. Then, the orientations of the arrangement of the concavo-convex pattern DP and the arrangement of the lenses 122 are slightly different. In this way, as a composite image formed by combining the plurality of diffraction images displayed by each of the plurality of uneven patterns DP, the moire effect is generated by shifting and overlapping the array of the uneven patterns DP and the array of the lenses 122. One or more magnified images of the diffraction image are displayed.

  FIG. 6 is a plan view schematically showing an example of an image displayed by the display shown in FIG. 1 when the lens array is omitted. FIG. 7 is a plan view schematically showing an example of an image displayed by the display body shown in FIG. FIG. 8 is a plan view schematically showing another example of an image displayed by the display shown in FIG. FIG. 6 shows only a part of the display body, and FIGS. 7 and 8 show the entire display body.

When the lens array is omitted from the display body 10, the moire effect does not occur. Therefore, the diffracted images displayed by the concavo-convex patterns DP are not synthesized, and the display body 10 displays a plurality of diffracted images _ID corresponding to the plurality of unit regions as shown in FIG.

If the arrangement of the concave / convex pattern DP and the arrangement of the lens 122 are shifted and overlapped as described with reference to FIG. 3 without omitting the lens array, a moire effect is generated, and the display 10 is shown in FIG. An enlarged image of the diffraction image I _D is displayed as a combined image formed by combining a plurality of diffraction images I _D. For example, the display body 10, one enlarged image I _D as shown in FIG. 7 to display a 'should be displayed, two enlarged images I _D 8', or a number of expansion than Display the image _ID '.

Thus, the display body 10 displays an enlarged image I _D ′ obtained by enlarging the small diffraction image I _D. Since the enlarged image I _D 'is a composite image formed by combining a plurality of diffraction image I _D, even missing portion in a part of the uneven pattern DP has occurred, the missing part is magnified image I _D There is little perceptible effect on '. In addition, the operation of the electron beam drawing apparatus and / or the surrounding environment fluctuates between the start and end of drawing, and this causes a mismatch between the pattern immediately after the start of drawing and the pattern immediately before the end of drawing. Even if it occurs, this discrepancy has little appreciable effect on the magnified image I _D '.

  In addition, in the display body 10, the uneven pattern DP is not provided over the entire unit area, but is provided only over a part of the unit area. Therefore, compared with the case where the concave / convex pattern DP is provided in the entire unit area, the time required for electron beam drawing for manufacturing the original plate can be shortened, and occurs between the pattern immediately after the start of drawing and the pattern immediately before the end of drawing. Shape mismatch can be reduced. In addition, since the drawing time can be shortened, the fluctuations in the drawing conditions are reduced, and hence the control thereof is facilitated.

  Further, when the concavo-convex pattern DP is provided only in a part of the unit region, the releasability from the mold of the concavo-convex formation layer 112 is insufficient compared to the case where the concavo-convex pattern DP is provided in the entire unit region. Can be easily prevented. In other words, it is possible to perform the peeling of the mold from the original plate and the resin layer from the mold with a small force, as well as the zipping at the time of peeling the mold from the original plate or the resin layer from the mold. It is easy to suppress the resulting peeling unevenness and pattern loss. Therefore, it is possible to form the concavo-convex pattern DP having excellent shape accuracy without requiring measures for reducing the throughput or improving the releasability. For the same reason, the same effect can be obtained in the mold manufacturing process.

  Therefore, even if this display body 10 is a case where a display area is large, it is easy to manufacture with high productivity and to display the image as designed.

The ratio of the magnified image I _D ′ to the size of the diffracted image I _D , that is, the magnification ratio changes according to the angle α shown in FIG. Note that the angle α is an angle formed by the unit region row and the lens 122 row. As the angle α is decreased, the enlargement ratio is increased. However, when the angle α is set to 0 °, the magnified image I _D ′ has an infinite size, so that the entire image cannot be observed. The angle α is, for example, several degrees, typically about 2 °.

  In the display 10, the moire effect is generated by the structure described with reference to FIG. 3, but the moire effect can also be generated when other structures are employed. For example, the orientations of the unit region array and the lens 122 array may be matched, and the pitches in the X direction and Y direction of the array may be different. Alternatively, the orientation and pitch of the unit region array and the lens 122 array may be matched, and the relative position of the concave / convex pattern DP with respect to the unit region may be different between the unit regions. For example, in the substantially central unit region, the concave / convex pattern DP may be positioned at the center of the unit region, and the position of the concave / convex pattern DP may be shifted outward from the center of the unit region in accordance with the distance from the previous unit region.

The display body 10 may further include a plurality of print patterns respectively facing the plurality of unit areas.
FIG. 9 is a plan view schematically showing a display body according to a modification. FIG. 10 is a plan view schematically showing an example of an image displayed by the display body shown in FIG. In FIG. 9, a diffracted image I _D displayed by them is drawn instead of the concavo-convex pattern DP.

The display body 10, except that each further comprises a plurality of print patterns that form the printing image I _P, have the same structure as the display body 10 described with reference to FIGS is doing. These print patterns face each of the plurality of unit areas. And the relative position of the uneven | corrugated pattern DP in a certain area | region and the printing pattern facing the unit area | region is constant throughout the display body 10. FIG.

The display body 10, when observed using a microscope, as shown in FIG. 9, displays the image combined with the print image I _P and the diffraction image I _D is arranged corresponding to the unit region. Then, when the display body 10 is observed with the naked eye, as shown in FIG. 10, in addition to the above-mentioned enlarged image I _D ′, the enlarged image I _P ′ of the printed image I _P is displayed by the moire effect. Accordingly, providing a print pattern enables more complicated display.

  For example, the print pattern is disposed between the reflective layer 14 and the adhesive layer 13. When the reflective layer 14 is light transmissive, the print pattern may be disposed between the reflective layer 14 and the unevenness forming layer 112 or between the unevenness forming layer 112 and the substrate 111. .

  The display body 10 can employ another laminated structure instead of the laminated structure shown in FIG.

  11 to 15 are cross-sectional views schematically showing a display body according to another modification.

  The display body 10 shown in FIG. 11 has the same structure as the display body 10 shown in FIG. 4 except that the diffractive structure layer 11 is bonded to the lens layer 12 so that the substrate 111 faces the lens layer 12. is doing. In this structure, since the flat surfaces are bonded to each other, bonding is easy. Further, in the structure in which the adhesive layer 13 is omitted from the display body 10, the concave / convex pattern DP or the reflective layer 14 is not damaged by friction with the lens layer 12.

  The display body 10 shown in FIG. 12 has the same structure as the display body 10 shown in FIG. 4 except that the lens layer 12 is bonded to the diffractive structure layer 11 so that the lens 122 faces the diffractive structure layer 11. is doing. In this structure, since the base materials 111 and 121 are the outermost layers, it is difficult to cause damage to members such as the lens 122 interposed therebetween.

  The display body 10 shown in FIG. 13 has the same structure as the display body 10 shown in FIG. 11 except that the lens layer 12 is bonded to the diffractive structure layer 11 so that the lens 122 faces the diffractive structure layer 11. is doing. With this structure, the lens 122 is hardly damaged. Further, in the structure in which the adhesive layer 13 is omitted from the display body 10, the concave / convex pattern DP or the reflective layer 14 is not damaged by friction with the lens layer 12.

  The display body 10 shown in FIG. 14 has the same structure as the display body 10 shown in FIG. 4 except that the base material 121 and the adhesive layer 13 are omitted. That is, in the display body 10, a lens 122 is formed on the reflective layer 14. Since this display body 10 has a smaller number of parts than the display body 10 shown in FIG. 4, it can be manufactured with fewer steps. Further, the display body 10 can be formed thinner than the display body 10 shown in FIG. 4, and the distance between the focal point of the lens 122 and the concave / convex pattern DP can be easily controlled.

  The display body 10 shown in FIG. 15 has the same structure as the display body 10 shown in FIG. 11 except that the base material 121 and the adhesive layer 13 are omitted. That is, in the display body 10, a lens 122 is formed on the base material 111. Since this display body 10 has a smaller number of parts than the display body 10 shown in FIG. 11, it can be manufactured with fewer steps. Further, the display body 10 can be formed thinner than the display body 10 shown in FIG. 11, and the distance between the focal point of the lens 122 and the concave / convex pattern DP can be easily controlled.

  The display body 10 described above can display a three-dimensional image by devising the shape of the lens 122 and the arrangement of the concavo-convex pattern DP. Moreover, if this is modulated instead of making the pitch of the lens 122 constant, the visual effect can be changed.

  For example, the display body 10 is supported by an article whose forgery or unauthorized use is to be suppressed. For example, when a labeled article including the display body 10 and an article that supports the display body 10 is a genuine article, if an article whose identity is unknown does not show one or more of the above-described features, It can be determined that the article is non-genuine. That is, it is possible to discriminate between an authentic product and a non-authentic product for an article whose authenticity is unknown. Therefore, forgery of, for example, certificates such as securities, banknotes, identification cards, and printed materials such as credit cards, and luxury items such as arts and crafts can be prevented or suppressed.

  When the display body is used as a label, the display body 10 can be supported on the article by various methods. For example, a pressure-sensitive adhesive layer may be provided on the display body 10 and the display body 10 may be attached to an article via the pressure-sensitive adhesive layer. Alternatively, a transfer foil including the display body 10 and an adhesive layer made of a thermoplastic resin may be manufactured, and the display body 10 may be attached to the article by transfer using heat and pressure. Alternatively, a tag including the display body 10 may be manufactured, and this may be supported on an article via an attachment such as a string and a chain. Or the packaging material containing the display body 10 may be manufactured, and an article may be packaged with this packaging material.

  This display body 10 can also be used for purposes other than forgery prevention. For example, an optical kit including the display 10 and a verification tool such as a magnifying glass can be used as a toy, a learning material, or an ornament in addition to being usable for the above-described authenticity determination. That is, the display body 10 provides an anti-counterfeit effect, a decorative effect, and / or an aesthetic effect.

(Example 1)
In this example, a display body 10 having a structure substantially similar to that described with reference to FIGS. 1 to 5 except that the adhesive layer 13 was omitted was manufactured.

  Specifically, the diffractive structure layer 11 was produced by the following method. First, an original plate made of a resin was manufactured using an electronic drawing apparatus, and a mold was manufactured from this original plate by electroforming. Next, an acrylic resin was injected into the mold as an ultraviolet curable resin, and this resin layer and a PET film 111 having a thickness of 50 μm were laminated. The resin was cured by irradiating ultraviolet rays from the PET film 111 side, and then peeled from the mold together with the resin layer on which the PET film 111 was cured. Thereby, the diffractive structure sheet 11 including the PET film 111 and the unevenness forming layer 112 was obtained.

  In the mold, a circular concavo-convex pattern DP each having a diameter of 20 μm in a square area of 100 mm on one side of the surface of the concavo-convex forming layer 112 is formed in a square lattice pattern at a pitch of 100 μm. Designed to be arranged. The spatial frequency of the grooves of the concavo-convex pattern DP was changed within a range of about 1500 to about 2400 lines / mm.

  Here, the mold was not subjected to mold release treatment. The laminating pressure was set light so that the thickness of the unevenness forming layer 112 was about 15 μm. When this mold and the unevenness forming layer 112 were examined, it was confirmed that there was no peeling unevenness at the time of molding and that the resin layer could be peeled cleanly from the mold.

  On the unevenness forming layer 112, the reflective layer 14 made of aluminum was formed by vapor deposition. The thickness of the reflective layer 14 was about 40 to about 60 nm.

  The lens layer 12 was produced by the following method. First, an acrylic / styrene copolymer resin was injected into the mold as an ultraviolet curable resin, and this resin layer and a PET film 121 having a thickness of 75 μm were laminated. The resin was cured by irradiating ultraviolet rays from the PET film 121 side, and then peeled from the mold together with the cured resin layer of the PET film 121. As a result, a microlens sheet 12 in which lenses 122 having a pitch of 100 μm, a height of about 26 μm, and a focal length of about 90 μm were arranged in a square lattice pattern on the PET film 121 was obtained.

  The diffractive structure sheet 11 and the microlens sheet 12 thus obtained were superposed so that the reflective layer 14 was interposed therebetween. The display body 10 was completed as described above.

When the magnified image I _D ′ displayed by the display 10 was observed, no display unevenness due to unevenness in electron beam drawing or uneven deposition was observed, and diffracted light could be clearly perceived. Further, when the diffractive structure sheet 11 was fixed and the microlens sheet 12 was rotated around the normal line, the size of the magnified image I _D ′ displayed on the display body 10 was changed. The maximum size of the magnified image I _D ′ was 100 mm square.

(Example 2)
In this example, the display body 10 having the substantially same structure as described with reference to FIG. 15 was manufactured.

  Specifically, the diffractive structure sheet 11 was produced by the same method as described in Example 1 except that the PET film 111 having a thickness of 90 μm was used and the pitch of the uneven pattern DP was 85 μm. Also in this example, as in Example 1, there was no peeling unevenness at the time of molding, and the resin layer could be peeled cleanly from the mold.

  Next, the lens 122 was formed by the following method on the back surface of the surface on which the unevenness forming layer 112 of the base material 111 was formed. First, an acrylic / styrene copolymer resin was injected into the mold as an ultraviolet curable resin, and this resin layer and the diffractive structure sheet 11 were laminated so that the ultraviolet curable resin layer faced the substrate 111.

The resin was cured by irradiating ultraviolet rays from the concave / convex forming layer 112 side, and then peeled from the mold together with the cured resin layer of the diffraction structure sheet 11. As a result, the microlens sheet 12 in which the lenses 122 were arranged in a square lattice pattern on the PET film 111 was obtained.

  The pitch, height, and focal length of the lenses 122 were the same as in Example 1. Further, the arrangement direction of the lenses 122, that is, the orientation of the lens array was made to coincide with the arrangement direction of the concavo-convex pattern DP.

  Thereafter, the same reflective layer 14 as described in Example 1 was formed on the unevenness forming layer 112. The display body 10 was completed as described above.

When the magnified image I _D ′ displayed by the display 10 was observed, no display unevenness due to unevenness in electron beam drawing or uneven deposition was observed, and diffracted light could be clearly perceived.

(Example 3)
In this example, the influence of the size of the uneven pattern on the production of the display body 10 was examined.
Specifically, first, using an electron beam drawing apparatus, an original plate was manufactured in which grooves arranged at a spatial frequency of 2000 lines / mm were formed in a square region having a side of 100 mm. And the metal mold | die was manufactured from this original plate by electroforming. When this mold was visually inspected, it was confirmed that the uneven pattern had a portion with insufficient uniformity.

  Next, an acrylic resin was injected into the mold as an ultraviolet curable resin, and this resin layer and a PET film having a thickness of 50 μm were laminated. The resin was cured by irradiating ultraviolet rays from the PET film side, and then peeled from the mold together with the resin layer on which the PET film was cured.

  This peeling required a large force. Further, during this peeling, zipping occurred, and when the molding was repeated three times, a peeling failure occurred, and the resin layer could not be peeled from the mold.

  From the above, it was confirmed that when the size of the uneven pattern is increased, the productivity of the display body 10 is lowered and it is difficult to manufacture the high-quality display body 10.

FIG. 6 is a perspective view illustrating a display body according to one embodiment of the present invention. The disassembled perspective view of the display body shown in FIG. The top view which shows schematically the display body shown in FIG. Sectional drawing along the IV-IV line of the display body shown in FIG. The top view which shows roughly the diffraction structure layer of the display body shown in FIG. The top view which shows roughly an example of the image which the display body shown in FIG. 1 displays when a lens array is abbreviate | omitted. The top view which shows roughly an example of the image which the display body shown in FIG. 1 displays. The top view which shows roughly the other example of the image which the display body shown in FIG. 1 displays. The top view which shows roughly the display body which concerns on one modification. The top view which shows roughly an example of the image which the display body shown in FIG. 9 displays. Sectional drawing which shows schematically the display body which concerns on another modification. Sectional drawing which shows schematically the display body which concerns on another modification. Sectional drawing which shows schematically the display body which concerns on another modification. Sectional drawing which shows schematically the display body which concerns on another modification. Sectional drawing which shows schematically the display body which concerns on another modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Display body, 11 ... Diffraction structure layer, 12 ... Lens layer, 13 ... Adhesive layer, 14 ... Reflective layer, 111 ... Base material, 112 ... Substrate formation layer, 121 ... Base material, 122 ... Lens, BL ... Unit Region boundary, DP ... concave-convex pattern, I _D ... diffraction image, I _D '... enlarged image, I _P ... printed image, I _P ' ... enlarged image.

Claims (10)

  One main surface includes a plurality of unit regions regularly arranged, and a concavo-convex pattern constituting a diffractive structure is provided in a part of each of the plurality of unit regions, and the plurality of unit regions are The concavo-convex pattern provided in the plurality of unit regions, comprising a diffractive structure layer having the same concavo-convex pattern structure and a lens array including a plurality of regularly arranged lenses and facing the diffractive structure layer And the plurality of lenses, as a composite image formed by combining a plurality of diffraction images respectively displayed by the concave and convex patterns provided in the plurality of unit regions, due to a moire effect caused by superposition of their arrangement. A display body arranged to display one or more magnified images of diffraction images.   One main surface includes a plurality of unit regions regularly arranged, and a concavo-convex pattern constituting a diffractive structure is provided in a part of each of the plurality of unit regions, and the plurality of unit regions are The concavo-convex pattern provided in the plurality of unit regions, comprising a diffractive structure layer having the same concavo-convex pattern structure and a lens array including a plurality of regularly arranged lenses and facing the diffractive structure layer Are regularly arranged and the arrangement is shifted in azimuth and / or pitch with respect to the arrangement of the plurality of lenses, or the concavo-convex pattern provided in the plurality of unit regions is irregularly arranged. A display body characterized by being.   The display body according to claim 1, further comprising a plurality of print patterns respectively facing the plurality of unit regions.   The display body according to any one of claims 1 to 3, further comprising a reflective layer covering the concavo-convex pattern.   5. The display body according to claim 1, wherein the lens array is formed on the one main surface or the other main surface of the diffractive structure layer. 6.   5. The transparent substrate according to claim 1, further comprising: a transparent substrate having one main surface supporting the lens array and the other main surface facing the other main surface of the diffractive structure layer. The display body described in the item.   5. The transparent substrate according to claim 1, further comprising: a transparent base material, wherein one main surface supports the lens array and faces the other main surface of the diffractive structure layer with the lens array interposed therebetween. The display body according to any one of the above.   5. The transparent substrate according to claim 1, further comprising: a transparent substrate having one main surface supporting the lens array and the other main surface facing the one main surface of the diffractive structure layer. The display body according to item 1.   5. The apparatus according to claim 1, further comprising: a transparent base material, wherein one main surface supports the lens array, and faces the one main surface of the diffractive structure layer with the lens array interposed therebetween. The display body according to any one of the above.   A labeled article comprising the display body according to any one of claims 1 to 9 and an article that supports the display body.

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