Three-dimensional display, authentication object, and method of forming

Abstract

This invention relates to a 3D display in which first element cells in which personal identification information is recorded and second element cells containing an authenticator in which personal identification information can be visually recognized are disposed on a laminate sheet, wherein the 3D display has a first region and a second region formed by disposing the first element cells and the second element cells in which a phase shift structure is formed, a three-dimensional structure is formed by disposing the first element cells and the second element cells in a nesting arrangement at a predetermined ratio in the first region and the second region, the first region and the second region are visually recognizable from different sides of the laminate sheet, a first reproduced image is reproduced on a first surface side of the laminate sheet by the phase shift structure formed in the first element cells, and a second reproduced image is reproduced on a second surface side of the laminate sheet by the phase shift structure formed in the second element cells.

Description

Technical Field

[0001] Embodiments of the present invention relate to, for example, an authentication body attached to a card, passport, and certificate for verification, etc., and used for genuine verification, a three-dimensional display body applicable to the authentication body, and a method for forming the three-dimensional display body.

Background Art

[0002] As authentication bodies containing personal information, various ID (Identification) cards such as passports and driver's licenses are known. Many ID cards display face information and character information for visual identification of personal information. However, if personal information is simply printed on the authentication medium, it can be easily forged or counterfeited.

[0003] As a method for preventing forgery of an authentication body, Patent Document 1 describes improving the forgery prevention property of the authentication body by attaching a hologram transfer foil to the authentication body. However, in addition to being already widely known, the forgery prevention technology described in Patent Document 1 is a hologram that emits simple rainbow diffracted light and can be easily forged.

[0004] Patent Document 2 describes imparting personal information using a fluorescent material that is transparent and invisible in visible light observation but visible in ultraviolet light observation.

[0005] Patent Document 3 describes, as a further forgery prevention method, performing authenticity verification using the reproduced information displayed on a hologram by irradiating the hologram with light of a specific wavelength. However, the technology described in Patent Document 3 has the reproduced information pre-designed and invariant. Therefore, if a forger knows the reproduced information, there is a risk that a hologram imitating the reproduced information will be produced.

[0006] On the other hand, laser interferometry holograms and computer-generated holograms (CGH), which calculate laser interferometry using a computer, are characterized by their ability to be viewed in 3D using binocular parallax. By changing the observer's field of view, they have a dynamic effect and can achieve functions that cannot be achieved with ordinary printed materials, and have been used in many security labels in recent years.

[0007] Due to this dynamic effect, this type of hologram is characterized by appearing to pop out from the surface of the medium. However, this is only possible under a point light source. When illuminated by a typical long, narrow fluorescent lamp, multiple lights, or a large light source, the reproduced image becomes blurred, which is a drawback.

[0008] Furthermore, the greater the depth of the reconstructed image, the more pronounced the blurring becomes. Therefore, there is a trade-off: adding depth to create a sense of three-dimensionality makes the image even more prone to blurring.

[0009] Therefore, generally speaking, it is difficult to achieve both a deep sense of depth and a sharp, clear image.

[0010] On the other hand, in order to eliminate this blurring of the reconstructed image, blur-free CGH technologies composed of diffraction gratings have been reported, such as the crystallogram disclosed in Patent Document 4 and PhotoColor disclosed in Patent Document 5.

[0011] These technologies have the advantage of producing clear, unblurred images that are easily visible in any environment, even though the color and brightness of the image vary between the two eyes, because the basic image itself remains the same. However, they have the drawback of lacking depth perception. Furthermore, these diffraction gratings are not suitable for machine reading.

[0012] Furthermore, the technology disclosed in Patent Document 6 has the drawback that, in addition to the fact that the display direction of the pattern is limited to the surface direction in which the face image and personal identification information on the authentication body are depicted, it also has a reflective layer, and therefore cannot support visibility from the back direction or the reproduction of the image in the front direction (for example, to enhance the sense of depth). [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 6-67592 [Patent Document 2] Japanese Patent No. 3198324 [Patent Document 3] Japanese Patent No. 4677683 [Patent Document 4] Japanese Patent Application Publication No. 2011-248279 [Patent Document 5] International Publication No. 2017 / 18718A1 [Patent Document 6] International Publication No. 2020 / 004633A1 [Patent Document 7] International Publication No. 2017 / 209113A1 [Overview of the project]

[0014] The present invention has been made in view of the above circumstances, and aims to provide an authentication body that can be visually and machine-readable, has a simple structure that can deter tampering and forgery, and whose authenticity can be easily determined, a three-dimensional display body applicable to the authentication body, and a method for forming the three-dimensional display body.

[0015] To achieve the above objectives, the present invention employs the following measures.

[0016] A first aspect of the present invention is a three-dimensional display body comprising a first element cell on which personal identification information is recorded and a second element cell including an authentication element that makes the personal identification information visible, arranged on a laminate sheet, having a first region and a second region formed by the arrangement of a plurality of the first element cells and the second element cells respectively, having a phase shift structure formed in the first element cell and the second element cell respectively, and in the first region and the second region, the first element cell and the second element cell are spaced apart via spacers. This is a three-dimensional display body characterized in that a three-dimensional structure is formed by placement, and the first and second regions placed on the three-dimensional structure form a consistent, unified three-dimensional image when the regenerated point cloud from the reflected light of the phase-shift structure is formed, and the first regenerated image is reproduced on the first surface side of the laminate sheet, spaced apart from the laminate sheet, by the phase-shift structure formed in the first element cell, and the second regenerated image is reproduced on the second surface side of the laminate sheet, spaced apart from the laminate sheet, by the phase-shift structure formed in the second element cell.

[0017] A second aspect of the present invention is a three-dimensional display body comprising a first contour region surrounding a recorded first character and a second contour region surrounding a recorded second character, arranged on a laminate sheet, wherein a plurality of first element cells on which personal identification information is recorded and a second element cell including an authentication element on which the personal identification information is visible are arranged in the first and second contour regions respectively, thereby forming a phase shift structure, and in the first and second contour regions respectively, the first element cells and the second element cells are arranged in a predetermined ratio A three-dimensional display body is formed by arranging the elements in a nested manner, wherein the first contour region and the second contour region are visible from different sides of the laminate sheet, and a phase shift structure formed in the first element cell reproduces a reproduced image of the second contour region on the first side of the laminate sheet, spaced apart from the laminate sheet, and a phase shift structure formed in the second element cell reproduces a reproduced image of the first contour region on the second side of the laminate sheet, spaced apart from the laminate sheet.

[0018] A third aspect of the present invention is a three-dimensional display body characterized by being constructed by connecting a three-dimensional display body of the first aspect of the present invention and a three-dimensional display body of the second aspect of the present invention.

[0019] A fourth aspect of the present invention is a third aspect of a three-dimensional display, characterized in that a first marker is provided on a laminate sheet on which a three-dimensional display of the first aspect is arranged, a second marker is provided on a laminate sheet on which a three-dimensional display of the second aspect is arranged, and the three-dimensional display of the first aspect and the three-dimensional display of the second aspect are connected by aligning the two laminate sheets using the first marker and the second marker.

[0020] A fifth aspect of the present invention is a three-dimensional display according to the fourth aspect, characterized in that a three-dimensional display according to the first aspect and a three-dimensional display according to the second aspect are superimposed and connected.

[0021] The sixth aspect of the present invention is a three-dimensional display body according to the first aspect, characterized in that a relationship of Z1 < Z2 holds between a first distance Z1, which is the distance from the first surface to the first reproduced image, and a second distance Z2, which is the distance from the second surface to the second reproduced image.

[0022] The seventh aspect of the present invention is a three-dimensional display body according to the first or fifth aspect, characterized in that a relationship of Z1 > Z2 holds between a first distance Z1, which is the distance from the first surface to the first reproduced image, and a second distance Z2, which is the distance from the second surface to the second reproduced image.

[0023] The eighth aspect of the present invention is a three-dimensional display body according to the second aspect, characterized in that a relationship of Z4 < Z3 holds between a third distance Z3, which is the distance from the second surface to the reproduced image of the first contour region, and a fourth distance Z4, which is the distance from the first surface to the reproduced image of the second contour region.

[0024] The ninth aspect of the present invention is a three-dimensional display body according to the second or fifth aspect, characterized in that a relationship of Z4 > Z3 holds between a third distance Z3, which is the distance from the second surface to the reproduced image of the first contour region, and a fourth distance Z4, which is the distance from the first surface to the reproduced image of the second contour region.

[0025] The tenth aspect of the present invention is a three-dimensional display body according to the first aspect, comprising a recording surface on the laminate sheet, and provided with a calculation element section that corresponds one-to-one to each reproduction point of the first reproduced image and the second reproduced image on the recording surface, and in which a phase component of light from each reproduction point is calculated, a phase angle recording region capable of recording a phase angle calculated based on the phase component, and a phase angle non-recording region where the phase angle is not recorded, and recording the phase angle in an overlapping region where the calculation element section and the phase angle recording region overlap.

[0026] An eleventh aspect of the present invention is a three-dimensional display body of the second aspect, characterized in that the laminate sheet is provided with a recording surface, the recording surface is provided with a calculation element section which corresponds one-to-one with each reproduction point of the reproduced image of the first contour region and the reproduced image of the second contour region and the phase component of light from each reproduction point is calculated, a phase angle recording area which can record the phase angle calculated based on the phase component, and a phase angle non-recording area in which the phase angle is not recorded, and the phase angle is recorded in the overlapping area where the calculation element section and the phase angle recording area overlap.

[0027] A twelfth aspect of the present invention is a three-dimensional display according to the tenth or eleventh aspect, characterized in that there are a plurality of calculation element sections, the phase component of light from each of the multiple calculation element sections is calculated for each calculation element section, and the calculated phase angle is recorded for each calculation element section.

[0028] A thirteenth aspect of the present invention is a three-dimensional display according to any tenth to twelfth aspect, characterized in that information other than the phase angle is recorded in the phase angle non-recording area.

[0029] A fourteenth aspect of the present invention is a three-dimensional display body according to the thirteenth aspect, characterized in that the information other than the phase angle includes at least one of the scattering, reflection, and diffraction characteristics of light.

[0030] A fifteenth aspect of the present invention is a three-dimensional display body according to the tenth aspect, wherein the first region has grayscale values ​​for each color in the calculation element section as data for a color image represented by two or more colors, and the second region has binarized grayscale values ​​based on the first region in the calculation element section.

[0031] A sixteenth aspect of the present invention is a three-dimensional display body according to the eleventh aspect, wherein the first contour region has gradation values ​​for each color in the calculation element section as data of a color image represented by two or more colors, and the second contour region has binarized gradation values ​​based on the first contour region in the calculation element section.

[0032] A 17th aspect of the present invention is an authentication body comprising a laminate in which a transparent outer layer substrate, a phase-shifting substrate that is modulated by receiving illumination light, a transparent intermediate substrate that changes color when receiving laser light, and a core substrate are laminated, wherein at least a portion of the core substrate has a transparent non-printed portion, and the laminate contains a three-dimensional display body according to any one of claims 1 to 16.

[0033] An eighteenth aspect of the present invention is the authentication body according to claim 17, characterized in that the first region and the second region of the three-dimensional display body are visible from the outside of the laminate.

[0034] A 19th aspect of the present invention is a method for forming a three-dimensional structure in a three-dimensional display body according to any one of claims 1 to 16, characterized in that the three-dimensional structure is formed by processing the first element cell and the second element cell with laser light irradiated from outside the three-dimensional display body.

[0035] According to the present invention, it is possible to provide an authentication body with a simple configuration that can be visually and machine-readable, which can deter tampering and forgery, and whose authenticity can be easily determined, a three-dimensional display body applicable to the authentication body, and a method for forming the three-dimensional display body.

[0036] According to the first embodiment of the three-dimensional display body, not only can a first reproduced image be reproduced at a distance from the first surface of the laminate sheet (e.g., the front surface as seen by the observer), but a second reproduced image can also be reproduced at a distance from the second surface of the laminate sheet (e.g., the back surface as seen by the observer).

[0037] Generally, if only one image is reproduced, the sense of depth obtained is limited to the distance from the surface of the laminate sheet to the reproduced image. However, in the three-dimensional display of the first embodiment, in addition to the first image being reproduced away from the surface of the laminate sheet, a second image is also reproduced away from the back surface, resulting in the reproduction of two images. The observer perceives the distance from the reproduction surface of the second image to the reproduction surface of the first image, making it possible to obtain a sense of depth regardless of the position of the authentication object in between. Furthermore, resistance to counterfeiting and design aesthetics are also improved.

[0038] Furthermore, by simultaneously bringing the depth of the first reconstructed image and the depth of the second reconstructed image closer together, it is possible to obtain an even greater sense of three-dimensionality through depth perception.

[0039] According to the second embodiment of the three-dimensional display, similar to the first embodiment, two reproduced images are reproduced on the front and back sides of the laminate sheet, making it possible to obtain a sense of three-dimensionality regardless of the position of the authentication object between them. Furthermore, resistance to counterfeiting and design aesthetics are also improved.

[0040] According to the third embodiment of the three-dimensional display, by connecting the three-dimensional display of the first embodiment and the three-dimensional display of the second embodiment, the sense of three-dimensionality, anti-counterfeiting effect, and design quality are further improved.

[0041] According to the third embodiment of the three-dimensional display, the third embodiment of the first embodiment and the third embodiment of the second embodiment can be aligned and connected using markers provided on the laminate sheet. Here, it is preferable that the third embodiment of the first embodiment and the third embodiment of the second embodiment have the same area and the same shape. Furthermore, markers can be provided at the boundary between the first element cell and the second element cell.

[0042] According to the fifth embodiment of the three-dimensional display, the boundary between the first element cell and the second element cell can be established such that the back surface of the laminate sheet of the first embodiment and the front surface of the laminate sheet of the second embodiment are facing each other. Here again, it is preferable that the three-dimensional display of the first embodiment and the three-dimensional display of the second embodiment have the same area and the same shape.

[0043] According to the 3D display body of the sixth embodiment, the first reconstructed image is made less prone to blurring regardless of the distance, number, and size of the illumination, while the second reconstructed image can be made observable only with a point light source. Furthermore, by reconstructing the first and second reconstructed images adjacent to each other, it is possible to simultaneously reconstruct the first reconstructed image, which is visible even under ambient lighting, and the second reconstructed image, which is only reconstructed with a point light source.

[0044] According to the 3D display of the seventh embodiment, unlike the 3D display of the sixth embodiment, the second reconstructed image is made less prone to blurring regardless of the distance, number, and size of the illumination, and the first reconstructed image can be made observable only with a point light source. Furthermore, by reconstructing the second and first reconstructed images adjacent to each other, it is possible to simultaneously reconstruct the second reconstructed image, which is visible even under ambient lighting, and the first reconstructed image, which is only reconstructed with a point light source.

[0045] According to the 3D display of the eighth embodiment, the fourth reconstructed image can be made less prone to blurring regardless of the distance, number, and size of the illumination, while conversely, the third reconstructed image can only be observed with a point light source. Furthermore, by reconstructing the third and fourth reconstructed images adjacent to each other, it is possible to simultaneously reconstruct the fourth reconstructed image, which is visible even under ambient lighting, and the third reconstructed image, which is only reconstructed with a point light source.

[0046] According to the 3D display of the ninth embodiment, unlike the 3D display of the eighth embodiment, the third reconstructed image is less prone to blurring regardless of the distance, number, and size of the illumination, and the fourth reconstructed image can only be observed with a point light source. Furthermore, by reconstructing the third and fourth reconstructed images adjacent to each other, it is possible to simultaneously reconstruct the third reconstructed image, which is visible even under ambient lighting, and the fourth reconstructed image, which is only reconstructed with a point light source.

[0047] According to the 10th to 14th embodiments of the three-dimensional display body, the calculation time for the phase angle by a computer can be reduced by recording the phase angle necessary for the reproduction of the reproduced image in an overlapping region.

[0048] According to the three-dimensional display bodies of the 15th and 16th embodiments, a changing effect can be achieved by changing the visible range of the personal identification information displayed on the three-dimensional display body.

[0049] According to the authentication bodies of the 17th and 18th embodiments, an authentication body that is visible on both the front and back surfaces of a laminated sheet can be provided by embedding a three-dimensional display within the laminate.

[0050] According to the method for forming a three-dimensional structure of the 19th embodiment, a first element cell and a second element cell are constructed from materials with different wavelength absorption rates, and the structure can be processed into any shape using, for example, an infrared laser with a wavelength of 1064 nm, a YVO / YAG laser, a fiber laser, or a CO2 laser (gas laser) with a wavelength of 10600 nm. Furthermore, by providing single-layer or multi-layer reflective layers such as Al, Ni, Ag, and TiO2 in the three-dimensional structure, these reflective layers can also be processed into any shape. [Brief explanation of the drawing]

[0051] [Figure 1] Figure 1 shows a cross-sectional view (b) of the three-dimensional display body according to this embodiment, a plan view (a) showing the first region and the first contour region, and a plan view (c) showing the second region and the second contour region. [Figure 1A]Figure 1A shows a cross-sectional view (a) of the three-dimensional display body shown in Figure 1(b), which is covered with a single or multi-layer reflective layer, and a cross-sectional view (b) of the three-dimensional display body in which the first and second regions are separated. [Figure 1B] Figure 1B is a cross-sectional view showing an example of the positional relationship between the laminate sheet and the adhesive area. [Figure 2] Figure 2 shows a cross-sectional view (a) illustrating a detailed configuration example of the upper side in Figure 1(b), a plan view (b) identical to that of Figure 1(a), a cross-sectional view (c) illustrating a detailed configuration example of the lower side in Figure 1(b), and a plan view (d) identical to that of Figure 1(c). [Figure 2A] Figure 2A corresponds to Figures 2(a) and 2(c), and is a cross-sectional view showing a configuration in which the first element cell and the second cell shown in Figures 2(a) and 2(c) are covered with a single or multi-layer reflective layer. [Figure 2B] Figure 2B is a cross-sectional view showing another example of the positional relationship between the laminate sheet and the adhesive area. [Figure 3] Figure 3 is a perspective view showing the state in which the reconstructed image is reproduced while isolated from both the front and back surfaces of the authentication object. [Figure 3A] Figure 3A is a perspective view showing the positional relationship of each regenerated image in Figure 3. [Figure 4] Figure 4 shows the reconstructed image when the authentication element shown in Figure 3 is reversed. [Figure 4A] Figure 4A is a perspective view showing the positional relationship of each reconstructed image in Figure 4. [Figure 5] Figure 5 is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display object. [Figure 6] Figure 6 is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display object. [Figure 7A] Figure 7A is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display object. [Figure 7B] Figure 7B is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display. [Figure 8A] Figure 8A is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display. [Figure 8B] Figure 8B is a diagram illustrating a method for forming a three-dimensional structure of a three-dimensional display. [Figure 9] Figure 9 shows an example of a passport created by transferring a three-dimensional hologram foil to both sides of the transparent window. [Figure 10] Figure 10 is a diagram illustrating the phase angle recording area for recording the phase calculated by CGH. [Figure 11] Figure 11 shows a cross-sectional view of the laminate before the 3D display is incorporated (a) and a cross-sectional view of the laminate with the 3D display incorporated (b). [Modes for carrying out the invention]

[0052] Embodiments of the present invention will be described in detail below with reference to the drawings. Components that perform similar or equivalent functions are denoted by the same reference numerals throughout the drawings, and redundant descriptions are omitted.

[0053] Figure 1 shows a cross-sectional view (b) of the three-dimensional display body according to this embodiment, a plan view (a) showing the first region and the first contour region, and a plan view (c) showing the second region and the second contour region.

[0054] Figure 2(a) is a cross-sectional view showing a detailed configuration example of the upper side in Figure 1(b), Figure 2(c) is a cross-sectional view showing a detailed configuration example of the lower side in Figure 1(b), Figure 2(b) is the same plan view as Figure 1(a), and Figure 2(d) is the same plan view as Figure 1(c).

[0055] Figure 3 is a perspective view showing the state in which the reconstructed image is reproduced while isolated from both the front and back surfaces of the authentication object.

[0056] Figure 3 shows the state in which the first reconstructed image 7a and the reconstructed image 11b of the second contour region, recorded in the first region 5 and the second contour region 10 of the three-dimensional display body 4 according to this embodiment, are reconstructed from the front side, and the second reconstructed image 7b and the reconstructed image 11a of the first contour region, recorded in the second region 6 and the first contour region 9, are reconstructed from the back side.

[0057] As illustrated in the cross-sectional view in Figure 1(b), the three-dimensional display body 4 according to this embodiment is made up of a plurality of first element cells 2 and second element cells 3 arranged on laminate sheets 1a and 1b. Laminate sheets 1a and 1b sandwich a laminate sheet 8.

[0058] The first element cell 2 records personal identification information, such as biometric information.

[0059] The second element cell 3 contains an authenticator that allows personal identification information to be viewed.

[0060] The three-dimensional display body 4 has a first region 5 (see Figure 1(a), which is a top plan view corresponding to Figure 1(b)) and a second region 6 (see Figure 1(c), which is a bottom plan view corresponding to Figure 1(b)), which are formed by the arrangement of a plurality of first element cells 2 and second element cells 3, respectively.

[0061] A phase shift structure is formed in the first element cell 2 and the second element cell 3, respectively.

[0062] Thus, as illustrated in Figure 1(b), the 3D display 4 can form a unified pattern on the border portion of a transparent substrate such as a laminate sheet 8 by precisely aligning and transferring hologram foils 21 and 22 with corresponding patterns to the front and back surfaces of the transparent substrate 8. For example, as shown in Figure 1(a), an example of the front surface, and Figure 1(c), an example of the back surface. Furthermore, an image can be formed by demetalizing a portion of the front or back surface by laser removal. This makes it possible to achieve both difficulty in counterfeiting and high discriminability, as even slight misalignments between the hologram foil 21 on the front side and the hologram foil 22 on the back side can be visually detected.

[0063] Figure 2(a) is a cross-sectional view showing a detailed configuration example of the upper side in Figure 1(b), and Figure 2(c) is a cross-sectional view showing a detailed configuration example of the lower side in Figure 1(b).

[0064] As shown in Figures 2(a) and 2(c), in the first region 5 and the second region 6, the first element cell 2 and the second element cell 3 are arranged in a nested manner in a predetermined ratio. This forms a three-dimensional structure.

[0065] As shown in Figure 1(b), the first region 5 and the second region 6 arranged in the three-dimensional structure form a consistent, unified three-dimensional image through the regenerated point cloud from the reflected light of the phase-shift structure, and are visible from different sides of the laminate sheet 8. For example, the first region 5 is visible from the upper side in Figure 1(b), and the second region 6 is visible from the lower side in Figure 1(b). Consistency means that the pattern of one side is placed in a region without a pattern on the other side. Also, consistency means that the patterns on the front and back sides form a single motif. The motif can be letters, symbols, marks, or decorations.

[0066] Due to the phase shift structure formed in the first element cell 2, as shown in Figure 3, the first reconstructed image 7a is reconstructed on the first surface side of the laminate sheet 8 (for example, the top surface in the figure) and spaced apart from the laminate sheet 1a. Also, due to the phase shift structure formed in the second element cell 3, as shown in Figure 3, the second reconstructed image 7b is reconstructed on the second surface side of the laminate sheet 8 (for example, the bottom surface in the figure) and spaced apart from the laminate sheet 1b.

[0067] As shown in Figure 2(b), the first region 5 contains a first character (e.g., a face), which is enclosed by the first contour region 9.

[0068] As shown in Figure 2(d), the second region 6 contains a second character (e.g., the sun), which is surrounded by a second contour region 10.

[0069] The first contour region 9 and the second contour region 10 also have a phase shift structure formed by the arrangement of multiple first element cells 2 and second element cells 3, respectively.

[0070] Furthermore, as shown in Figures 2(a) and 2(c), a three-dimensional structure is formed by arranging the first element cell 2 and the second element cell 3 in a nested manner in a predetermined ratio within the first contour region 9 and the second contour region 10, respectively.

[0071] The first contour region 9 and the second contour region 10 are visible from different sides of the laminate sheet 8. For example, as shown in Figures 1(b) and 1(a), the first contour region 9 is visible from the front side, which is the upper side in the figure, and as shown in Figures 1(b) and 1(c), the second contour region 10 is visible from the back side, which is the lower side in the figure.

[0072] Due to the phase shift structure formed in the first element cell 2, as shown in Figure 3, the reconstructed image 11b of the second contour region is reconstructed on the first surface of the laminate sheet 8 (for example, the upper surface in the figure) and spaced apart from the laminate sheet 1a. Furthermore, due to the phase shift structure formed in the second element cell 3, the reconstructed image 11a of the first contour region is reconstructed on the second surface of the laminate sheet 8 (for example, the lower back surface in the figure) and spaced apart from the laminate sheet 1b.

[0073] Thus, the first reconstructed image 7a and the second contour region reconstructed image 11b can be reconstructed so that they overlap in the upper part of Figure 3. If only one of the first reconstructed image 7a or the second contour region reconstructed image 11b is displayed, the sense of depth is poor. However, since the 3D display unit 4 can reconstruct the first reconstructed image 7a and the second contour region reconstructed image 11b so that they overlap, the observer can perceive a doubled sense of depth. In addition, a part of the surface composed of the point cloud of the first region 5 and a part of the surface composed of the point cloud of the second region 6 may be made parallel. This makes it possible to display a multi-layered composite image.

[0074] Similarly, the second reconstructed image 7b and the first contour region reconstructed image 11a can be reconstructed so that they overlap in the lower part of Figure 3. If only one of the second reconstructed image 7b or the first contour region reconstructed image 11a is displayed, the sense of depth is poor. However, since the 3D display unit 4 can reconstruct the second reconstructed image 7b and the first contour region reconstructed image 11a so that they overlap, the observer can perceive a doubled sense of depth. Furthermore, a portion of the surface formed by the point cloud of the first contour region 9 and a portion of the surface formed by the point cloud of the second contour region 10 may be made parallel. This makes it possible to display a multi-layered composite reconstructed image.

[0075] Furthermore, the 3D display body 4 can have a first region 5 for reproducing the first reconstructed image 7a and a second region 6 composed of a diffraction grating that diffracts light with different pitches and azimuth angles in a specific direction, arranged adjacent to each other within the 3D display body 4. The first region 5 may each have multiple phase angle recording regions. The second region 6 may also have multiple phase angle recording regions with different pitches, azimuth angles, or both of the recorded diffraction gratings. The phase angle recording regions will be described later with reference to Figure 10.

[0076] Furthermore, the three-dimensional display body 4 forms a contour portion 20 in which a first contour region 9 and a second contour region 10 composed of a diffraction grating that diffracts light with different pitches and azimuth angles in a specific direction are arranged adjacent to each other by the alignment of the marker 19.

[0077] The first contour region 9 may also have a phase angle recording region, as described later. Similarly, the second contour region 10 may also have a phase angle recording region, as described later, with different pitches, azimuthal angles, or both of the recorded diffraction gratings.

[0078] The area of ​​the first region 5 and the first contour region 9 can be the same as or larger than the area of ​​the second region 6 and the second contour region 10.

[0079] The first region 5 and the first contour region 9, and the second region 6 and the second contour region 10 can be arranged adjacent to each other with a predetermined gap between them. However, in this case, the brightness of the reproduced images 7a, 7b, 11a, and 11b will be darkened by the area of ​​the phase angle recording region, which will be described later. Therefore, the brightness can be adjusted by changing the area of ​​the first element cell 2 and the second element cell 3 in the first region 5, the first contour region 9, the second region 6, and the second contour region 10.

[0080] By placing an appropriate space between the first element cell 2 and the second element cell 3, and at a distance that can be simultaneously viewed by an observer, the first element cell 2 and the second element cell 3 can be spaced apart via a spacer and arranged in a nested manner, for example, at a certain ratio. The certain ratio can be the ratio of the number of first element cells 2 to the number of second element cells 3 within the unit area of ​​the computation element section described later. Furthermore, the first element cell 2 and the second element cell 3 can be the same size. In addition, the first element cell 2 and the second element cell 3 can be the same shape.

[0081] The sizes of the first element cell 2 and the second element cell 3 can be between 5 μm and 150 μm. This size can be the length of the shorter side of the first element cell 2 and the second element cell 3. It can also be the length of the shorter side of the rectangle that circumscribes the first element cell 2 and the second element cell 3.

[0082] Figure 1A(a) is a cross-sectional view of the three-dimensional display body 4 shown in Figure 1(b), which is covered with a single or multilayer reflective layer 14.

[0083] Figure 2A(a) corresponds to Figures 2(a) and 2(c), and is a cross-sectional view showing a configuration in which the first element cell 2 and the second element cell 3 shown in Figures 2(a) and 2(c) are covered with a single-layer or multi-layer reflective layer 14.

[0084] Figure 3A is a perspective view showing the positional relationship between the reconstructed images 7a, 7b, 11a, and 11b in Figure 3.

[0085] In FIG. 3A, the first distance Z1 indicates the distance from the first surface of the laminate sheet 1a (for example, the upper surface in the figure) to the first reproduced image 7a. Also, the second distance Z2 indicates the distance from the second surface of the laminate sheet 1b (for example, the lower surface in the figure) to the second reproduced image 7b. Further, the third distance Z3 indicates the distance from the second surface of the laminate sheet 1b (for example, the lower surface in the figure) to the reproduced image 11a of the first contour region. Furthermore, the fourth distance Z4 indicates the distance from the first surface of the laminate sheet 1a (for example, the upper surface in the figure) to the reproduced image 11b of the second contour region. In FIG. 3A, the relationship is Z1 < Z2 and Z4 < Z3.

[0086] FIG. 4 is a view showing the reproduced images that are reproduced when the authentication body 100 shown in FIG. 3 is inverted.

[0087] In the case of FIG. 4, contrary to FIG. 3, the first reproduced image 7a and the reproduced image 11b of the second contour region are reproduced separated from the laminate sheet 1a on the lower side in the figure, and the second reproduced image 7b and the reproduced image 11a of the first contour region are reproduced separated from the laminate sheet 1b on the upper side in the figure.

[0088] FIG. 4A is a perspective view showing the positional relationship of the respective reproduced images 7a, 7b, 11a, 11b in FIG. 4.

[0089] In FIG. 4A, contrary to FIG. 3A, the relationship is Z1 > Z2 and Z4 > Z3.

[0090] FIGS. 3 and 4 show that the first reproduced image 7a and the second reproduced image 7b recorded as a structure having a phase shift function between the first region 5 and the second region 6 can be observed under illumination light. In other words, the first reproduced image 7a and the second reproduced image 7b recorded as a structure having a phase shift function in the phase angle recording region described later are reproduced by illumination.

[0091] The first reconstructed image 7a, the second reconstructed image 7b, the reconstructed image 11a of the first contour region, and the reconstructed image 11b of the second contour region are composed of multiple reconstruction points. In other words, the first reconstructed image 7a, the second reconstructed image 7b, the reconstructed image 11a of the first contour region, and the reconstructed image 11b of the second contour region are displayed as a group of reconstruction points.

[0092] As shown in Figure 3, the first reconstructed image 7a represents a face, and the second reconstructed image 7b represents the sun. In other words, the first reconstructed image 7a and the second reconstructed image 7b may be different. Also, the sizes of the first reconstructed image 7a and the second reconstructed image 7b may be the same or different. For example, the ratio of the areas of the convex hulls of the first reconstructed image 7a and the second reconstructed image 7b can be between 1:2 and 2:1.

[0093] Furthermore, the size of the first reconstructed image 7a can be made smaller than the size of the second reconstructed image 7b. In this case, for example, the ratio of the convex hull areas of the first reconstructed image 7a and the second reconstructed image 7b can be 1:10 or greater and less than 1:2.

[0094] For the three-dimensional display 4, the first reconstructed image 7a is reconstructed on the front side, i.e., the side facing the observer, and the second reconstructed image 7b is reconstructed on the back side, i.e., the side facing the observer. Figure 4 shows the situation on the back side, and the expression is the opposite of the expression shown in Figure 3 above.

[0095] In the example shown in Figure 3, the reconstructed image 11a of the first contour region is shown in white text on a black background, and the reconstructed image 11b of the second contour region is shown in black text on a white background. In other words, the reconstructed image 11a of the first contour region and the reconstructed image 11b of the second contour region may be different. Also, the reconstructed image 11a of the first contour region and the reconstructed image 11b of the second contour region may be the same size. For example, relating to the first reconstructed image 7a and the second reconstructed image 7b, the ratio of the areas of the convex hulls of the reconstructed image 11a of the first contour region and the reconstructed image 11b of the second contour region can be between 1:2 and 2:1.

[0096] Furthermore, the size of the reconstructed image 11a of the first contour region can be made smaller than the size of the reconstructed image 11b of the second contour region. For example, the ratio of the convex hull areas of the reconstructed image 11a of the first contour region and the reconstructed image 11b of the second contour region can be 1:10 or greater and less than 1:2.

[0097] For the 3D display 4, the reconstructed image 11b of the second contour region is reconstructed on the front side, i.e., the side facing the observer, while the reconstructed image 11a of the first contour region is reconstructed on the back side, i.e., the side facing the observer. Figure 4 shows the situation on the back side, and the expression is the opposite of the expression shown in Figure 3 above.

[0098] As shown in Figure 3, the structure of the authentication body 100, which has a phase-shift function, causes the first reconstructed image 7a, the second reconstructed image 7b, the reconstructed image of the first contour region 11a, and the reconstructed image of the second contour region 11b, which are planar reconstructed images, to be reconstructed in space spaced apart from the three-dimensional display body 4. In other words, the structure with a phase-shift function reconstructs the planar reconstructed images 7a, 7b, 11a, and 11b in space. The shapes of the reconstructed images 7a, 7b, 11a, and 11b can also be curved surfaces. In this case, the sense of three-dimensionality obtained when the observer observes increases in proportion to the reconstructed distance of the reconstructed image, that is, the distance between the center of the reconstructed images 7a, 7b, 11a, and 11b and the surface of the three-dimensional display body 4 (Z1, Z2, Z3, and Z4 mentioned above).

[0099] However, if the playback distance is made too large, image blurring occurs under point light sources. Therefore, the playback distance should be set to a range that does not cause blurring. As shown in Figure 3, the 3D display unit 4 reproduces the images 7a, 7b, 11a, and 11b in the space on the front side of the 3D display unit 4 and in the space on the back side, respectively. This makes it possible to increase the sense of depth while suppressing blurring of the reproduced images 7a, 7b, 11a, and 11b.

[0100] Both Figure 3A and Figure 4A show the case where the reproduction distance Z1 from the 3D display 4 to the first reproduced image 7a and the reproduction distance Z2 from the 3D display 4 to the reproduced image 7b are different. However, Figure 4A shows an example where the front and back surfaces of the 3D display 4 are reversed, and the two reproduced images 7a, 7a are reproduced in the opposite direction to that in Figure 3A.

[0101] In both FIGS. 3A and 4A, the reproduction distance Z3 from the three-dimensional display body 4 to the reproduced image 11a of the first contour region and the reproduction distance Z4 from the three-dimensional display body 4 to the reproduced image 11b of the second contour region are different. FIG. 3A shows an example in which the reproduced images 11b, 11b of the first and second contour regions are reproduced on different sides with the three-dimensional display body 4 interposed therebetween, and FIG. 4A shows an example in which the front and back surfaces of the three-dimensional display body 4 shown in FIG. 3A are reversed, and the reproduced images 11a, 11b of the first and second contour regions are reproduced on the side opposite to that in FIG. 3A.

[0102] The security effect realized by the three-dimensional display body 4 will be described using FIGS. 3A and 4A.

[0103] In the example shown in FIG. 3A, the reproduction distance Z1 from the three-dimensional display body 4 to the first reproduced image 7a and the reproduction distance Z2 from the three-dimensional display body 4 to the second reproduced image 7b are different, and they have the relationship Z2 < Z1. Also, the reproduction distance Z3 from the three-dimensional display body 4 to the reproduced image 11a of the first contour region and the reproduction distance Z4 from the three-dimensional display body 4 to the reproduced image 11b of the second contour region are different, and they have the relationship Z4 < Z3.

[0104] On the other hand, the example shown in FIG. 4A shows the state of the three-dimensional display body 4 shown in FIG. 3A as seen from the back side, and as an expression state, an effect opposite to that in FIG. 3A is obtained, and the relationships Z1 < Z2 and Z3 < Z4 are established.

[0105] Although not shown, the three-dimensional display body 4 can also be configured such that the first reproduced image 7a and the second reproduced image 7b are both reproduced on the front side or, conversely, both on the back side.

[0106] Similarly, the three-dimensional display body 4 can also be configured such that the reproduced image 11a of the first contour region and the reproduced image 11b of the second contour region are both reproduced on the front side or, conversely, both on the back side.

[0107] According to the authentication body 100 shown in Figure 3, under ambient lighting, when observed from the front direction, that is, from the direction normal to the surface of the laminate sheet 1a, the first reconstructed image 7a and the reconstructed image 11b of the second contour region can be seen. However, as the observation direction deviates from the front direction and the field of view angle increases, the reconstructed images 7a and 11b become blurred and indistinguishable, while only the second reconstructed image 7b and the reconstructed image 11a of the first contour region become visible.

[0108] However, under illumination by a point light source instead of ambient lighting, the first reconstructed image 7a and the reconstructed image 11a of the first contour region can be clearly seen even when the values ​​of the reconstruction distance Z2, Z3 and the field of view angle are large. Furthermore, the second reconstructed image 7b and the reconstructed image 11b of the second contour region can be clearly seen. Therefore, a sense of depth can be perceived by comparing the first reconstructed image 7a and the second reconstructed image 7b.

[0109] A structure having a phase shift function for reproducing the reproduction point is realized by calculating the phase in the structure having a phase shift function from the optical distance and wavelength of the reproduction point using CGH, and recording a structure having a phase shift function that shifts the phase of incident light corresponding to that phase in the phase angle recording areas (described later) of the first region 5, the first contour region 9, the second region 6, and the second contour region 10.

[0110] Structures with a phase shift function can be recorded in the phase angle recording area described later either as a relief structure or as a modulation of the refractive index.

[0111] When recording a phase difference as a relief structure, the following procedure is followed. First, an electron beam is exposed to a resist plate coated with electron beam resist on a glass plate, with a dose of electron beam corresponding to the phase shift amount. The resist plate is then developed to form a surface with irregularities corresponding to the phase shift amount. Next, a metal layer is deposited on the surface with irregularities formed on the resist plate to create a master plate. Then, nickel shims are replicated from the master plate by electroforming. The replicated shims are embossed onto a film coated with resin on a carrier, thereby recording the relief structure in the resin. Structures with phase shift functionality recorded as relief structures in this way offer excellent mass-producibility. The resin used to emboss the relief structure can be a thermoplastic resin, a curable resin, or a composite of both. In particular, a composite of a thermoplastic resin and a curable resin can record the phase as a relief structure with high precision, allowing for high-density recording of reproduction points. Furthermore, the 3D display 4 on which the relief structure is recorded can be destroyed if it is heated and peeled off from the substrate for tampering, thus providing high resistance to tampering.

[0112] When creating a single-sided relief structure, a relief structure consisting of one face is created, including a first region 5, a first contour region 9, a second region 6, and a second contour region 10.

[0113] To create a double-sided relief structure, alignment markers 19 are placed in the margins of the laminate sheet. Two relief structures are then created, each consisting of a first region 5, a first contour region 9, a second region 6, and a second contour region 10. These two relief structures are then aligned using their respective markers 19 and glued together. The margins containing the markers are then trimmed or demetalized to remove them, leaving the structure as a pattern.

[0114] Next, a method for forming the three-dimensional structure of the 3D display body 4 will be described using Figures 5 and 6, Figures 7A and 7B, and Figures 8A and 8B.

[0115] Figures 5 and 6, 7A and 7B, and 8A and 8B are diagrams illustrating a method for forming a three-dimensional structure of a three-dimensional display.

[0116] As shown in Figures 5(a), 7A(a), and 7B(a), a strong laser beam 13a is irradiated onto one or both sides of the three-dimensional display body 4 from the laser irradiation device 12a. This causes the first element cell 2 and / or the second element cell 3, which are three-dimensional structures molded from resin, to melt, and the single or multilayer reflective layer 14 on the laminate sheet 1 to evaporate. As a result, the hologram foil on the surface side can be partially demetalized by the laser, as shown in Figures 5(b), 7A(b), and 7B(b).

[0117] The laser irradiation device 12 can be an infrared laser with a wavelength of 1064 nm, a YVO / YAG laser, a fiber laser, or a CO2 laser (gas laser) with a wavelength of 10600 nm.

[0118] The material for the reflective layer 14 can be a metal or a metal compound, or silicon oxide. The metal compound can be a metal oxide, a metal sulfide, or a metal fluoride. These metal compounds are resistant to chemical changes and can retain the recorded image in the recording area for a long period of time.

[0119] Metal sulfides can be zinc sulfide. Metal oxides can be titanium oxide. Metal fluorides can be magnesium fluoride. Metals can be elemental or alloys of aluminum, silver, tin, nickel, chromium, and gold. Aluminum, in particular, forms a passivation layer, resulting in high durability and the ability to retain the recorded image for a long period of time.

[0120] On the other hand, as shown in Figures 6(a), 8A(a), and 8B(a), by irradiating one or both sides with a weak laser beam 13b from the laser irradiation device 12b, as shown in Figures 6(b), 8A(b), and 7B(b), it is possible to remove only the single-layer or multi-layer reflective layer 14 while leaving the first element cell 2 and / or the second element cell 3, or to remove only a portion of the reflective layer 14, by using materials with different wavelength absorption rates.

[0121] Materials with different wavelength absorption rates include metal compounds. Examples of metal compounds include zinc sulfide, alumina, and titanium oxide. These metal compounds are resistant to chemical changes and can retain reconstructed images stored in memory for extended periods.

[0122] This makes it possible to halve the effect of the reflective layer 14. Furthermore, by forming the first element cell 2 and the second element cell 3 that form the three-dimensional structure with a resin that can be deformed by a laser, it becomes possible to arbitrarily change the shape of the reconstructed image or to halve or amplify the effect of the reconstructed image.

[0123] By transferring a three-dimensional holographic foil to both sides of the transparent window portion 23 formed by laser demetallation, it becomes possible to create a card that is difficult to counterfeit. An example of its application to a passport will be explained.

[0124] Figure 9 shows an example of a passport created by transferring a three-dimensional hologram foil to both sides of the transparent window.

[0125] In this passport 40, a first facial image 41 and a second facial image 42 are formed by transferring a three-dimensional holographic foil to the front and back of the transparent window portion corresponding to the transparent window portion 23 in Figure 7A(b).

[0126] In this passport 40, even if the first facial image 41 is tampered with, the tampering can be detected by the discrepancy with the second facial image 42 formed in the transparent window. Furthermore, counterfeit items can be visually detected by the misalignment of the three-dimensional patterns on the front and back.

[0127] Next, we will describe how to record the phase calculated by CGH in the phase angle recording areas of the first region 5, the first contour region 9, the second region 6, and the second contour region 10.

[0128] Figure 10 is a diagram illustrating the phase angle recording area for recording the phase calculated by CGH.

[0129] The 3D display unit 4 has a recording surface on a laminate sheet 8. Pixels are provided on the recording surface, and these pixels are classified into a calculation element area 15, a phase angle recording area 16, and a phase angle non-recording area 17, as described in Patent Document 7.

[0130] The positional relationship between these calculation element sections 15, the phase angle recording area 16, and the phase angle non-recording area 17 will be explained using the XYZ Cartesian coordinate system.

[0131] When light is incident on a pixel plane from a direction intersecting it, the incident light is modulated by the pixel plane, thereby obtaining a reconstructed image. The reconstructed image is an image of multiple reconstruction points. The reconstruction points are preferably located at a distance of 5 mm to 25 mm from the pixel plane in the Z direction.

[0132] The field of view θ is defined as the range in the field of view direction over which the reconstructed image is reproduced when the pixel plane is viewed from the reconstruction point of interest. In the following explanation, the field of view direction is either the X direction or the Y direction. The field of view θ from the reconstruction point is defined by equation (1) below.

[0133] θ < (A / m) ... (1) Here, if (λ / 2d) ≤ 1, then equation (2) below is obtained.

[0134] A = asin(λ / 2d) ... (2) However, λ is the wavelength of light, d is the spacing between units in the field of view direction, and m is a real number greater than or equal to 3.

[0135] The wavelength λ of light can be specifically set to 555 nm, which is the maximum relative luminous efficiency for humans within the visible light spectrum. The array spacing d can be the distance between the centers of the unit blocks. The array spacing d of the unit blocks can be between 10 nm and 200 nm.

[0136] The field of view angle θ is determined by the range in the X direction when viewing the pixel plane from the playback point of interest, and is half of the angle 2θ formed by the minimum value Xmin in the X direction and the maximum value Xmax between the playback point of interest and the X direction. Note that the X and Y directions correspond to the X and Y coordinate axes of Euclidean coordinates, where the direction in which the pixel plane extends is the X direction and the direction perpendicular to the X direction is the Y direction.

[0137] The field of view angle θ is similarly defined when the field of view direction is the Y direction. That is, the field of view angle θ is determined by the range in the Y direction when viewing the relief surface from the point of interest, and is half of the angle 2θ formed by the minimum value Ymin in the Y direction, the point of interest, and the maximum value Ymax in the Y direction. Therefore, the array spacing d of the unit block corresponds to the array spacing dx in the X direction of the unit block when the field of view direction is the X direction, and corresponds to the array spacing dy in the Y direction of the first element cell 2 and the second element cell 3 when the field of view direction is the Y direction.

[0138] Therefore, the calculation element section 15 is generally a square or a rectangle. However, the calculation element section 15 may be a polygon other than a quadrilateral, or a circle or an ellipse. Among polygons, hexagons are particularly suitable in addition to squares and rectangles. If the calculation element section 15 is not a square or a rectangle, the minimum value (lower limit) in the X direction of the calculation element section 15 is set to Xmin, and the maximum value (upper limit) in the X direction of the calculation element section 15 is set to Xmax. Similarly, the minimum value in the Y direction of the calculation element section 15 is set to Ymin, and the maximum value in the Y direction of the calculation element section 15 is set to Ymax.

[0139] When the shape of a unit block is a square or rectangle, it actually becomes a rounded rectangle with rounded corners. Unit blocks may also be merged with adjacent unit blocks. In this case, even if the shape of each unit block is a rounded rectangle, the shape of the merged unit blocks will not be a rounded rectangle but will be deformed, but the optical effect will not change even if it is deformed by merging. It is preferable that the unit blocks are arranged in an orderly manner. An orderly arrangement can be an arrangement with a certain range of intervals or an arrangement with equal intervals. Typical orderly arrangements are a square arrangement or a hexagonal arrangement.

[0140] As is clear from equation (1) above, the field of view angle θ is less than A. When light passes through this phase component and is diffracted, theoretically, diffraction beyond A does not occur. Therefore, when performing hologram calculations using a computer, the calculation range should be limited to the field of view angle θ. By limiting the calculation range in this way, the calculation time can be shortened. Furthermore, even if calculations are performed in the range beyond the field of view angle θ, it is only calculating diffraction that does not theoretically exist, and the result contributes only as noise. However, in the above calculation, calculations are not performed in the range beyond the field of view angle θ, so no noise is superimposed when the reconstructed image is reconstructed at the reconstruction point.

[0141] Both the phase angle recording area 16 and the phase angle non-recording area 17 contain multiple unit blocks. Within the phase angle recording area 16, the computer calculates the phase angle based on the phase component for the unit blocks included in the overlapping area, which is the area that overlaps with the calculation element section 15. The calculated phase angle is then recorded in the unit blocks included in the overlapping area.

[0142] On the pixel plane, calculation element sections 15 are defined according to the viewing angle θ. In this way, the calculation element sections 15 are defined independently of the phase angle recording area 16 and the phase angle non-recording area 17, and therefore normally overlap with the phase angle recording area 16 and the phase angle non-recording area 17 individually.

[0143] Each calculation element section 15 corresponds one-to-one with each regeneration point in the reconstructed image, and the phase component of the light from each regeneration point is calculated. Since there are multiple regeneration points, there are also multiple calculation element sections 15, which are equal in number to the number of regeneration points, and the phase component of the light from each regeneration point is calculated for each of these multiple calculation element sections 15.

[0144] The phase angle recording area 16 is an area in which the phase angle calculated based on the phase component can be recorded.

[0145] The phase angle non-recording region 17 is a region where the phase angle is not recorded, and in one example, it is a mirror surface.

[0146] The phase angle is recorded for each calculation element section 15 in the overlapping area where the calculation element section 15 and the phase angle recording area 16 overlap.

[0147] The phase angle non-recording region 17 can record information other than the phase angle, such as light scattering, reflection, and diffraction characteristics.

[0148] Figure 11 shows a cross-sectional view of the laminate 30 before the 3D display 4 is enclosed (a) and a cross-sectional view of the laminate 30 with the 3D display 4 enclosed (b). The overall thickness can be in the range of 0.18 mm or more and 0.84 mm or less, for example, according to JIS X 6311 and JIS X 6301 (ISO / IEC 7810).

[0149] The laminate 30 is constructed by stacking, from top to bottom in the figure, a transparent protective layer 31 which is a transparent outer substrate, a phase modulation layer 32 which is modulated by receiving illumination light, a printing layer 33 which is a transparent intermediate substrate that changes color when receiving laser light, a core layer 34 which is a core substrate, the printing layer 33, the phase modulation layer 32, and the transparent protective layer 31 in that order. The first region 5 and the second region 6 of the 3D display body 4 are visible from the outside of the laminate 30.

[0150] By encapsulating the 3D display body 4 within the enclosed portion 25, which is a transparent, non-printed portion that is part of the core layer 34, a laminated body 30 containing the 3D display body 4 can be formed, as shown in Figure 11(b).

[0151] The three-dimensional display 4 can also be formed on a carrier (not shown). In this case, the three-dimensional display 4 on the carrier (not shown) can be attached to an encapsulation (not shown) by hot stamping it through an adhesive region 18 as shown in Figures 1B and 2B.

[0152] Figures 1B and 2B are cross-sectional views showing an example of the positional relationship between the laminate sheet and the adhesive area.

[0153] The laminate sheet 1 on which the 3D display 4 is placed can be attached to a substrate, such as a printed notebook, printed page, or printed card, via an adhesive area 18 as shown in Figures 1B and 2B. The adhesive area 18 can also be attached to the substrate by hot stamping. In this way, an authentication body 100 equipped with the 3D display 4 can be obtained by attaching the 3D display 4 to the substrate.

[0154] Examples of authentication entities 100 include cards. These cards can be ID cards, license cards, or game cards. ID cards can include national ID cards, foreign resident cards, or tax payment cards. Booklets can also be passports.

[0155] Carriers not shown in the diagram may be plastic films. The material of the plastic film may be PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PP (polypropylene). The plastic film may also have a coating layer formed by applying a resin.

[0156] As shown in Figure 11, the phase modulation layer 32 can be multilayer. The phase modulation layer 32 can be constructed by sequentially laminating an embossed layer, a reflective layer, and a mask layer. Note that the reflective layer and mask layer can be omitted. The material of the transparent protective layer 31 can be a thermoplastic polymer. The material of the embossed layer can be a cured polymer. The material of the reflective layer can be inorganic. The transparent protective layer 31 and the embossed layer can be formed by coating. The reflective layer can be formed as a single layer or multilayer by deposition. Deposition can be physical deposition or chemical deposition. Physical deposition can be vacuum deposition or sputtering. The mask layer can be formed by printing ink. Printing can be offset printing, gravure printing, or screen printing. The ink can be oil-based ink or water-based ink. The ink may also be UV ink.

[0157] The embossed layer can be a single layer or a composite layer. The composite layer can consist of a relief layer, an intermediate layer, and an anchor layer. The relief layer can be a cured polymer. The anchor layer can be a thermosetting polymer. The intermediate layer can be a mixture.

[0158] The material of the transparent protective layer 31 can be a mixture of resin and lubricant. The resin can be a thermoplastic resin. Examples of resins include acrylic resin, polyester resin, polyamide resin, and cellulose resin. As a lubricant, waxes such as polyethylene powder, paraffin wax, silicone, and carnauba wax can be used. These can be formed as a release layer on the substrate layer by known coating methods such as gravure printing or microgravure printing. The thickness of the release layer can be in the range of 0.5 μm or more and 5 μm or less.

[0159] The material of the single-layer embossed layer can be polyacrylate, polyurethane acrylate, or polyacrylic acrylate. The material of the relief layer can be polyacrylate, polyurethane acrylate, or polyacrylic acrylate. The material of the intermediate layer can be a mixture of polyacrylate and polyurethane acrylate. The material of the anchor layer can be polyurethane acrylate.

[0160] Furthermore, by heat and pressure, the transparent protective layer 31, the phase modulation layer 32, the printing layer 33, and the core layer 34 containing the three-dimensional display body 4 in the internal part 35 are laminated in this order and integrated by thermal compression, forming a laminated body 30 as shown in Figure 11(b). The laminated body 30 can be a card, a tag, or a booklet page. This allows for the formation of an authentication object with a security label.

[0161] Furthermore, an additive element, a reflection-scattering layer (not shown), can also be provided. A functional ink whose color changes depending on the illumination angle or observation angle can be used for the reflection-scattering layer. Examples of such functional inks include optical variable inks, color-shifting inks, and pearl inks.

[0162] Next, we will describe the recording method using the arrangement of the first region 5, the first contour region 9, the second region 6, and the second contour region 10.

[0163] The first area 5 can record data of personal identification information, including biometric information. For example, the face of an ID card holder can be reproduced as a first reconstructed image 7a by representing it as a color image using two or more colors, with a gradation value for each color in each calculation element section 15.

[0164] The second region 6 can record additional data of personal identification information, including biometric information, from the first region 5. For example, by having a binarized grayscale value for each computation element section 15 based on the first region 5, hash information and the like related to the ID card owner stored in the first region 5 can be reconstructed as the second reconstructed image 7b.

[0165] The first contour region 9 has grayscale values ​​for each color in each calculation element section 15, representing data of a color image expressed in two or more colors. The second contour region 10 also has binarized grayscale values ​​based on the first contour region 9, in each calculation element section 15.

[0166] As a result, the first contour region 9 and the second contour region 10 can record characters of personal identification information, including biometric information related to the first region 5 and the second region 6. For example, hash information related to the ID card owner recorded in the first region 5 and the second region 6 can be reproduced as the reproduced image 11a of the first contour region and the reproduced image 11b of the second contour region, thereby enhancing the design aesthetics.

[0167] Furthermore, the first contour region 9 and the second contour region 10 can be used for anti-counterfeiting purposes of the first region 5 and the second region 6. For example, the first region 5 and the first contour region 9 can be combined, and the element cells on the region can be arranged so that they overlap the two regions, allowing a counterfeit product made by peeling off the original product to reproduce an image that is clearly identifiable as a counterfeit.

[0168] Next, the specific manufacturing of a card according to an embodiment of the present invention will be described in the following examples, again with reference to Figure 11. [Examples]

[0169] A transparent polycarbonate resin sheet (100 μm thick) was used as the material for the transparent protective layer 31, a transparent polycarbonate resin sheet (100 μm thick) containing a phase shift structure was used as the material for the phase modulation layer 32, a laser-colorable polycarbonate resin sheet (100 μm thick) was used as the material for the printing layer 33, and a white polycarbonate resin sheet (200 μm thick) was used as the material for the core layer 34.

[0170] Next, the three-dimensional display 4 formed on the laminate sheet was partially hot-stamped onto the printing layer 33. Then, the transparent protective layer 31, the phase modulation layer 32, the printing layer 33, and the core layer 34 in which the three-dimensional display 4 is placed in the enclosed portion 25 were laminated in this order, heated and pressed with a 180-degree plate, and then cooled. After that, it was die-cut to a shape of 85 x 54 mm to obtain a card.

[0171] A three-dimensional display body 4 having a phase structure is formed by nesting multiple first element cells 2 on the front side of the three-dimensional display body 4, which reproduce a reproduced image 7a showing a face motif as a group of multiple reproduction points at a reproduction distance of Z1 = 2 mm from the front surface of the three-dimensional display body 4, and multiple second element cells 3 on the back side of the three-dimensional display body 4, which reproduce a reproduced image 7b showing a sun motif as a group of multiple reproduction points at a reproduction distance of Z2 = 2 mm from the back surface of the three-dimensional display body 4, within the first region 5 and the second region 6.

[0172] By observing a card with the 3D display 4 attached under a point light source, the observer can perceive a sense of depth by observing the reconstructed image of the face motif and the reconstructed image of the sun motif from a distance of 4 mm. Furthermore, under ambient lighting from a surface light source or indirect lighting, only the reconstructed image of the face 7a, which is reconstructed 2 mm from the front side of the 3D display 4, was visible on the front side of the 3D display 4. However, with illumination from a point light source, the reconstructed image of the sun 7b, which is reconstructed 2 mm from the back side of the 3D display 4, became visible on the front side of the 3D display 4. Electroformed plate fabrication

[0173] A master was formed on a resist plate using electron beam lithography to create a relief structure with uneven surfaces. After depositing a conductive film on the surface of the master, shims were replicated by electroforming. Transfer foil fabrication.

[0174] The 3D display body 4 was formed by first applying a peelable transparent protective layer 31 onto a PET film carrier, then applying a precursor onto the transparent protective layer 31 to form an embossed layer with a drying thickness of 3 μm, and finally applying pressure with heat and UV irradiation to a shim having an uneven surface formed by electroforming to the surface of the embossed layer. The resulting uneven surface formed on the embossed layer created a relief structure. Subsequently, an aluminum reflective layer was formed on the surface of the embossed layer with the relief structure by vacuum deposition. Furthermore, an adhesive layer was formed on the reflective layer by applying an adhesive material. These coating materials may be diluted with a solvent.

[0175] As shown in the above examples, it has been confirmed that a laminate 30 containing a three-dimensional display body 4 according to an embodiment of the present invention can be manufactured successfully.

[0176] The best mode for carrying out the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to this configuration. Within the scope of the invented technical idea of ​​the claims, a person skilled in the art can conceive of various modifications and alterations, and it is understood that such modifications and alterations also fall within the technical scope of the present invention. [Explanation of symbols]

[0177] 1. Laminate sheet, 2. First element cell, 3. Second element cell, 4. Three-dimensional display, 5. First region, 6. Second region, 7a. First reconstructed image, 7b. Second reconstructed image, 8. Laminate sheet, 9. First contour region, 10. Second contour region, 11a. Reconstructed image of the first contour region, 11b. Reconstructed image of the second contour region, 12. Laser irradiation device, 13a. Strong laser light, 13b. Weak laser light, 14. Reflective layer, 1 5...Calculation element section, 16...Phase angle recording area, 17...Phase angle non-recording area, 18...Adhesion area, 19...Marker, 20...Contour section, 21...Front hologram foil, 22...Back hologram foil, 23...Transparent window section, 25...Inner section, 30...Laminate, 31...Transparent protective layer, 32...Phase modulation layer, 33...Printing layer, 34...Core layer, 35...Inner section, 40...Passport, 41...First face image, 42...Second face image, 100...Authentication element

Claims

1. A three-dimensional display comprising a first element cell on which personal identification information is recorded, and a second element cell including an authentication element that makes the personal identification information visible, arranged on a laminate sheet, Having a first region and a second region formed by the arrangement of a plurality of the first element cells and the second element cells, A phase shift structure is formed in the first element cell and the second element cell, respectively. In the first region and the second region, the first element cell and the second element cell are arranged spaced apart with spacers in between to form a three-dimensional structure. The first and second regions arranged in the three-dimensional structure form a consistent, unified three-dimensional image when the regenerated point cloud from the reflected light of the phase-shift structure is generated. Due to the phase shift structure formed in the first element cell, a first reconstructed image is reconstructed on the first surface side of the laminate sheet, spaced apart from the laminate sheet. A three-dimensional display body characterized in that, due to the phase shift structure formed in the second element cell, a second reproduced image is reproduced on the second surface side of the laminate sheet, spaced apart from the laminate sheet.

2. A three-dimensional display characterized by being constructed by connecting a first three-dimensional display, which is a three-dimensional display described in claim 1, and a second three-dimensional display, The second three-dimensional display body is A first contour region surrounding a recorded first character and a second contour region surrounding a recorded second character are arranged on a laminate sheet. In the first contour region and the second contour region, a plurality of first element cells on which personal identification information is recorded and a second element cell containing an authentication body on which the personal identification information is visible are respectively arranged, thereby forming a phase shift structure. In the first contour region and the second contour region, the first element cell and the second element cell are arranged in a nested manner in a predetermined ratio to form a three-dimensional structure. The first contour region and the second contour region are visible from different sides of the laminate sheet, Due to the phase shift structure formed in the first element cell, the reconstructed image of the second contour region is reproduced on the first surface side of the laminate sheet, spaced apart from the laminate sheet. A three-dimensional display body in which, due to the phase shift structure formed in the second element cell, a reproduced image of the first contour region is reproduced on the second surface side of the laminate sheet, spaced apart from the laminate sheet.

3. A first marker is provided on the laminate sheet on which the first three-dimensional display body is placed. A second marker is provided on the laminate sheet on which the second three-dimensional display body is placed. The three-dimensional display according to claim 2, characterized in that the first three-dimensional display and the second three-dimensional display are connected by aligning the two laminate sheets using the first marker and the second marker.

4. The three-dimensional display according to claim 3, characterized in that the first three-dimensional display and the second three-dimensional display are superimposed and connected.

5. The three-dimensional display body according to claim 1, characterized in that the relationship Z1 < Z2 holds between a first distance Z1, which is the distance from the first surface to the first reconstructed image, and a second distance Z2, which is the distance from the second surface to the second reconstructed image.

6. The three-dimensional display body according to claim 1, characterized in that the relationship Z1 > Z2 holds between a first distance Z1, which is the distance from the first surface to the first reconstructed image, and a second distance Z2, which is the distance from the second surface to the second reconstructed image.

7. The laminate sheet is provided with a recording surface, and on the recording surface, A calculation element section is provided, which corresponds one-to-one with each reproduction point of the first and second reproduction images, and calculates the phase component of light from each reproduction point. A phase angle recording area capable of recording the phase angle calculated based on the aforementioned phase component, A phase angle non-recording region is provided in which the aforementioned phase angle is not recorded. The three-dimensional display according to claim 1, characterized in that the phase angle is recorded in the overlapping region where the calculation element section and the phase angle recording area overlap.

8. Multiple calculation element sections exist, The phase component of the light from each of the aforementioned regeneration points is calculated for each of the plurality of calculation element sections. The three-dimensional display according to claim 7, characterized in that the calculated phase angle is recorded for each of the calculation element sections.

9. The three-dimensional display according to claim 7, characterized in that information other than the phase angle is recorded in the phase angle non-recording area.

10. The three-dimensional display according to claim 9, characterized in that the information other than the phase angle includes at least one of the scattering, reflection, and diffraction characteristics of light.

11. The first region has, as data for a color image represented by two or more colors, a gradation value for each color, for each calculation element section. The three-dimensional display body according to claim 7, wherein the second region has a binarized grayscale value based on the first region for each of the calculation element sections.

12. An authentication body comprising a laminate in which a transparent outer layer substrate, a phase-shifting substrate that is modulated by receiving illumination light, a transparent intermediate substrate that changes color when receiving laser light, and a core substrate are laminated, The core substrate has at least a portion of a transparent, non-printed area, An authentication body characterized in that the three-dimensional display body described in claim 1 is contained within the laminate.

13. The authentication body according to claim 12, characterized in that the first region and the second region of the three-dimensional display body are visible from the outside of the laminate.

14. A method for forming the three-dimensional structure in the three-dimensional display body according to claim 1, A forming method characterized by forming the three-dimensional structure by processing the first element cell and the second element cell with laser light irradiated from outside the three-dimensional display body.

Images