3D display, authenticator, and formation method

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

Three-dimensional display body, authentication body, and formation method

[0001] Embodiments of the present invention relate to an authentication body that is attached to, for example, cards, passports, visas, etc. and used to verify authenticity, a three-dimensional display body applicable to the authentication body, and a method for forming the three-dimensional display body.

[0002] Various types of ID (Identification) cards, such as passports and driver's licenses, are known as authentication devices that contain personal information. Many ID cards display facial information and text information to allow for visual identification of personal information. However, if personal information is simply printed on an authentication medium, it can easily be tampered with or forged.

[0003] As a method for preventing the counterfeiting of an authentication body, Patent Document 1 describes a method for improving the tamper-proofing ability of an authentication body by applying a hologram transfer foil to the authentication body. However, the counterfeiting prevention technology described in Patent Document 1 is already widely known, and a hologram that emits simple rainbow-colored diffracted light can be easily counterfeited.

[0004] Patent Document 2 describes the use of a fluorescent material to provide personal information that is transparent and invisible when observed with visible light but visible when observed with ultraviolet light.

[0005] Patent Document 3 describes a further method for preventing counterfeiting, in which a hologram is irradiated with light of a specific wavelength, and the reproduced information displayed on the hologram is used to verify its authenticity. However, with the technology described in Patent Document 3, the reproduced information is designed in advance and remains unchanged. Therefore, if a counterfeiter learns the reproduced information, there is a risk that they could create a hologram that imitates the reproduced information.

[0006] On the other hand, laser interference holograms and computer-generated holograms (CGHs), which use a computer to calculate laser interference, are characterized by the ability to provide stereoscopic vision using binocular parallax.By changing the viewer's field of view, they can produce dynamic effects and realize functions that cannot be achieved with ordinary printed materials, and as such, they have been used in many security labels in recent years.

[0007] Due to this dynamic effect, this type of hologram has the characteristic of appearing to jump out from the surface of the medium. However, this requires that it be reproduced using a point light source. If it is illuminated using a typical elongated fluorescent lamp, multiple lights, or a light with a large light-emitting surface, the reproduced image will be blurred.

[0008] Furthermore, the greater the depth of the reproduced image, the more noticeable the blurring. Therefore, adding depth to create a three-dimensional effect means that the image becomes even more blurred, which is a trade-off.

[0009] Therefore, it is generally difficult to achieve both a deep three-dimensional effect and a clear reproduced image.

[0010] On the other hand, in order to eliminate such blurring of the reconstructed image, blur-free CGH technologies that are constructed using a diffraction grating have been reported, such as Crystalgram disclosed in Patent Document 4 and PhotoColor disclosed in Patent Document 5.

[0011] Although these technologies change the color and brightness of the image between the eyes, the basic image itself is the same for both eyes, so there is no blurring in the reconstructed image and it is easy to see in any environment. However, they have the disadvantage of lacking a sense of three-dimensionality. Furthermore, these diffraction gratings are not suitable for machine reading.

[0012] Furthermore, the technology disclosed in Patent Document 6 has the drawback that the image is displayed only in the direction of the front surface on which the facial image and personal identification information are drawn on the authentication device, and that because it has a reflective layer, it is not possible to support viewing from the back surface or to support a reproduced image in the front surface direction (for example, to enhance the three-dimensional effect).

[0013] Japanese Patent Publication No. 6-67592 Japanese Patent No. 3198324 Japanese Patent No. 4677683 Japanese Patent Publication No. 2011-248279 International Publication No. 2017 / 18718A1 International Publication No. 2020 / 004633A1 International Publication No. 2017 / 209113A1

[0014] The present invention has been made in consideration of the above circumstances, and aims to provide an authentication body that has a simple configuration that can be visually and machine-read, can prevent tampering and counterfeiting, and makes it easy to determine its authenticity, a three-dimensional display body that can be applied to the authentication body, and a method for forming the three-dimensional display body.

[0015] In order to achieve the above object, the present invention takes the following measures.

[0016] A first aspect of the present invention is a three-dimensional display body in which first element cells in which personal identification information is recorded and second element cells including an authentication body that makes the personal identification information visible are arranged on a laminate sheet, the three-dimensional display body having a first region and a second region formed by arranging a plurality of the first element cells and the second element cells, respectively, a phase shift structure is formed in each of the first element cells and the second element cells, and the first element cells and the second element cells are arranged to be spaced apart via a spacer in each of the first region and the second region. a three-dimensional structure is formed by placing the first region and the second region arranged on the three-dimensional structure, and a group of reconstructed points by reflected light of the phase shift structure forms a consistent, integrated three-dimensional image in the first region and the second region arranged on the three-dimensional structure; a first reconstructed image is reconstructed on a first surface side of the laminate sheet at a distance from the laminate sheet by the phase shift structure formed in the first element cell; and a second reconstructed image is reconstructed on a second surface side of the laminate sheet at a distance 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 in which a first outline region surrounding a recorded first character and a second outline region surrounding a recorded second character are arranged on a laminate sheet, and a plurality of first element cells in which personal identification information is recorded and a second element cell including an authentication body that makes the personal identification information visible are arranged in the first outline region and the second outline region, respectively, thereby forming a phase shift structure, and in each of the first outline region and the second outline region, the first element cells and the second element cells are arranged at a predetermined ratio. a three-dimensional structure is formed by arranging the first and second element cells in a nested manner, the first contour region and the second contour region are visible from different sides of the laminate sheet, a phase shift structure formed in the first element cell causes a reproduced image of the second contour region to be reproduced on the first side of the laminate sheet at a distance from the laminate sheet, and a phase shift structure formed in the second element cell causes a reproduced image of the first contour region to be reproduced on the second side of the laminate sheet at a distance from the laminate sheet.

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

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

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

[0021] A sixth aspect of the present invention is the three-dimensional display body of 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 reconstructed image, and a second distance Z2, which is the distance from the second surface to the second reconstructed image.

[0022] A seventh aspect of the present invention is a three-dimensional display body of 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 reconstructed image, and a second distance Z2, which is the distance from the second surface to the second reconstructed image.

[0023] An eighth aspect of the present invention is a three-dimensional display body of 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 reconstructed image of the first contour area, and a fourth distance Z4, which is the distance from the first surface to the reconstructed image of the second contour area.

[0024] A ninth aspect of the present invention is a three-dimensional display body of 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 reconstructed image of the first contour area, and a fourth distance Z4, which is the distance from the first surface to the reconstructed image of the second contour area.

[0025] A tenth aspect of the present invention is the three-dimensional display body of the first aspect, characterized in that the laminate sheet is provided with a recording surface, the recording surface is provided with calculation element sections that correspond one-to-one to each reproduction point of the first reconstructed image and the second reconstructed image and in which the phase components of light from each reproduction point are calculated, a phase angle recording area in which a phase angle calculated based on the phase components can be recorded, and a phase angle non-recording area in which the phase angle is not recorded, and the phase angle is recorded in an overlapping area in which the calculation element section and the phase angle recording area 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, and the recording surface is provided with calculation element sections that correspond one-to-one to each reproduction point of the reproduction image of the first contour area and the reproduction image of the second contour area, and in which the phase components of light from each reproduction point are calculated, a phase angle recording area in which a phase angle calculated based on the phase components can be recorded, and a phase angle non-recording area in which the phase angle is not recorded, and the phase angle is recorded in an overlapping area where the calculation element section and the phase angle recording area overlap.

[0027] A twelfth aspect of the present invention is the three-dimensional display body of the tenth or eleventh aspect, characterized in that there are a plurality of the computational element partitions, the phase component of the light from each of the reproduction points is calculated for each of the plurality of computational element partitions, and the calculated phase angle is recorded for each of the computational element partitions.

[0028] A thirteenth aspect of the present invention is the three-dimensional display medium according to any one of the tenth to twelfth aspects, 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 the three-dimensional display body of the thirteenth aspect, characterized in that the information other than the phase angle is information including at least one of scattering, reflection, and diffraction characteristics of light.

[0030] A fifteenth aspect of the present invention is the three-dimensional display body of the tenth aspect, wherein the first region has gradation values ​​for each color for each of the computational element partitions as data of a color image expressed in two or more colors, and the second region has binarized gradation values ​​for each of the computational element partitions based on the first region.

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

[0032] A seventeenth aspect of the present invention is an authentication body comprising a laminated body including a transparent outer layer substrate, a phase shifting substrate that modulates upon receiving illumination light, a transparent intermediate substrate that develops color upon receiving laser light, and a core substrate, wherein at least a portion of the core substrate has a transparent non-printed portion, and the laminated body contains a three-dimensional display body described in 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 area and the second area of ​​the three-dimensional display body are visible from outside the laminate.

[0034] A nineteenth aspect of the present invention is a method for forming the three-dimensional structure in a three-dimensional display body described in 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 that has a simple configuration that can be visually and machine-read, can prevent tampering and counterfeiting, and makes it easy to determine its authenticity, a three-dimensional display body that can be applied to the authentication body, and a method for forming the three-dimensional display body.

[0036] According to the three-dimensional display device of the first aspect, not only can a first reconstructed 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 also a second reconstructed image can 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, when only one reconstructed image is reproduced, only the reconstructed distance from the surface of the laminate sheet to the one reconstructed image is obtained as a three-dimensional effect. However, in the three-dimensional display device of the first aspect, in addition to the first reconstructed image being reproduced at a distance from the surface of the laminate sheet, the second reconstructed image is also reproduced at a distance from the back surface, so that two reconstructed images are reproduced, and the viewer perceives the reconstructed distance from the reconstructed surface of the second reconstructed image to the reconstructed surface of the first reconstructed image, making it possible to obtain a three-dimensional effect regardless of the position of the authentication object between them. In addition, counterfeit resistance and design properties are also improved.

[0038] Furthermore, by simultaneously making the depth of the first reconstructed image and the depth of the second reconstructed image closer to each other, it is possible to obtain an even greater sense of three-dimensionality due to the depth.

[0039] According to the three-dimensional display of the second aspect, as with the three-dimensional display of the first aspect, two reproduced images are reproduced on the front and back sides of the laminate sheet, so that a three-dimensional effect can be obtained regardless of the position of the authentication object between them. In addition, counterfeit resistance and designability are also improved.

[0040] According to the three-dimensional display body of the third aspect, by connecting the three-dimensional display body of the first aspect with the three-dimensional display body of the second aspect, the three-dimensional effect, anti-counterfeiting effect, and design are further improved.

[0041] According to the three-dimensional display body of the fourth aspect, the three-dimensional display body of the first aspect and the three-dimensional display body of the second aspect can be aligned and connected using markers provided on the respective laminate sheets. Here, the three-dimensional display body of the first aspect and the three-dimensional display body of the second aspect preferably have the same area and shape. Furthermore, the marker can be provided at the boundary between the first element cell and the second element cell.

[0042] According to the three-dimensional display body of the fifth aspect, the back surface of the laminate sheet of the three-dimensional display body of the first aspect and the front surface of the laminate sheet of the three-dimensional display body of the second aspect can be arranged opposite to each other to form a boundary between the first element cell and the second element cell. Again, it is preferable that the three-dimensional display body of the first aspect and the three-dimensional display body of the second aspect have the same area and shape.

[0043] According to the three-dimensional display device of the sixth aspect, the first reconstructed image is less likely to blur regardless of the distance, number, or size of the illumination, and conversely, the second reconstructed image can be made observable only from a point light source. Furthermore, by reconstructing the first reconstructed image and the second reconstructed image adjacent to each other, it is possible to simultaneously reconstruct the first reconstructed image that is visible even under ambient lighting and the second reconstructed image that is reconstructed only from a point light source.

[0044] According to the three-dimensional display device of the seventh aspect, in contrast to the three-dimensional display device of the sixth aspect, the second reconstructed image is less likely to blur regardless of the distance, number, or size of the illumination, and the first reconstructed image can be made observable only from a point light source. Furthermore, by reconstructing the second reconstructed image and the first reconstructed image adjacent to each other, it is possible to simultaneously reconstruct the second reconstructed image that is visible even under ambient lighting and the first reconstructed image that is reconstructed only from a point light source.

[0045] According to the three-dimensional display device of the eighth aspect, the fourth reconstructed image is less likely to blur regardless of the distance, number, or size of the illumination, and conversely, the third reconstructed image can be made observable only with a point light source. Furthermore, by reconstructing the third reconstructed image and the fourth reconstructed image adjacent to each other, it is possible to simultaneously reconstruct the fourth reconstructed image that is visible even under ambient lighting and the third reconstructed image that is reconstructed only with a point light source.

[0046] According to the three-dimensional display device of the ninth aspect, in contrast to the three-dimensional display device of the eighth aspect, the third reconstructed image is less likely to blur regardless of the distance, number, or size of the illumination, and the fourth reconstructed image can be made observable only from a point light source. Furthermore, by reconstructing the third reconstructed image and the fourth reconstructed image adjacent to each other, it is possible to simultaneously reconstruct the third reconstructed image that is visible even under ambient lighting and the fourth reconstructed image that is reconstructed only from a point light source.

[0047] According to the three-dimensional display bodies of the tenth to fourteenth aspects, the phase angles required for reconstructing the reconstructed image are recorded in the overlapping area, thereby reducing the time required for calculating the phase angles by a computer.

[0048] According to the three-dimensional display bodies of the fifteenth and sixteenth aspects, 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 seventeenth and eighteenth aspects, by incorporating a three-dimensional display body in the laminate, it is possible to provide an authentication body that can be viewed on both the front and back surfaces of the laminate sheet.

[0050] According to the method for forming a three-dimensional structure of the nineteenth aspect, the first element cell and the second element cell are made of materials with different wavelength absorption rates, and the first element cell and the second element cell are formed by using, for example, an infrared laser with a wavelength of 1064 nm, a YVO / YAG laser, a fiber laser, or a CO ２ It can be processed into any shape using a laser (gas laser). Furthermore, Al, Ni, Ag, TiO ２ By providing such a single-layer or multi-layer reflective layer, these reflective layers can also be processed into any desired shape.

[0051] FIG. 1 is a cross-sectional view (b) of a three-dimensional display body according to this embodiment, a plan view (a) showing a first region and a first outline region, and a plan view (c) showing a second region and a second outline region. FIG. 1A is a cross-sectional view (a) of the three-dimensional display body shown in FIG. 1B covered with a single-layer or multi-layer reflective layer, and a cross-sectional view (b) of the three-dimensional display body in which the first region and the second region are separated. FIG. 1B is a cross-sectional view showing an example of the positional relationship between a laminate sheet and an adhesive region. FIG. 2 is a cross-sectional view (a) showing an example of a detailed configuration of the upper surface side in FIG. 1B, a plan view (b) identical to FIG. 1A, a cross-sectional view (c) showing an example of a detailed configuration of the lower surface side in FIG. 1B, and a plan view (d) identical to FIG. 1C. 2A corresponds to FIGS. 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 FIGS. 2(a) and 2(c) are covered with a single-layer or multi-layer reflective layer. FIG. 2B is a cross-sectional view showing another example of the positional relationship between the laminate sheet and the adhesive region. FIG. 3 is a perspective view showing a state in which a reconstructed image is reconstructed separately from each of the front and back surfaces of the authentication object. FIG. 3A is a perspective view showing the positional relationship of each reconstructed image in FIG. 3. FIG. 4 is a diagram showing a reconstructed image when the authentication object shown in FIG. 3 is inverted. FIG. 4A is a perspective view showing the positional relationship of each reconstructed image in FIG. 4. FIG. 5 is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. FIG. 6 is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. FIG. 7A is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. FIG. 7B is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. FIG. 8A is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. Fig. 8B is a diagram for explaining a method for forming a three-dimensional structure of a three-dimensional display object. Fig. 9 is a diagram showing an example of a passport created by transferring three-dimensional hologram foil to the front and back of a transparent window portion. Fig. 10 is a diagram for explaining a phase angle recording area for recording a phase calculated by a CGH. Fig. 11 is a cross-sectional view (a) of a laminate before a three-dimensional display object is embedded, and a cross-sectional view (b) of a laminate with a three-dimensional display object embedded.

[0052] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components that perform the same or similar functions are designated by the same reference numerals throughout the drawings, and redundant description will be omitted.

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

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

[0055] FIG. 3 is a perspective view showing a state in which the reproduced images are reproduced separately from 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 area, recorded in the first area 5 and the second contour area 10 of the three-dimensional display body 4 of this embodiment, are reproduced from the front side, and the second reconstructed image 7b and the reconstructed image 11a of the first contour area, recorded in the second area 6 and the first contour area 9, are reproduced from the back side.

[0057] 1(b), the three-dimensional display body 4 according to this embodiment is formed by arranging a plurality of first element cells 2 and second element cells 3 on laminate sheets 1a and 1b. A laminate sheet 8 is sandwiched between the laminate sheets 1a and 1b.

[0058] In the first element cell 2, personal identification information such as biometric information is recorded.

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

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

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

[0062] In this way, as shown in FIG. 1( b), the three-dimensional display body 4 can be formed by transferring holographic foils 21 and 22 with corresponding patterns to the front and back of a transparent substrate such as a laminate sheet 8 with high precision alignment. For example, as shown in FIG. 1( a) (an example of the front surface) and FIG. 1( c) (an example of the back surface), a pattern can be formed on both sides of the border. Furthermore, an image can be formed by demetalizing a portion of the front or back surface by laser removal. This makes it possible to visually distinguish even a slight misalignment between the holographic foil 21 on the front side and the holographic foil 22 on the back side, making it both difficult to counterfeit and easy to distinguish.

[0063] 2A is a cross-sectional view showing an example of a detailed configuration of the upper surface side in FIG. 1B, and FIG. 2C is a cross-sectional view showing an example of a detailed configuration of the lower surface side in FIG. 1B.

[0064] 2(a) and 2(c), in each of the first region 5 and the second region 6, the first element cells 2 and the second element cells 3 are nested at a predetermined ratio, thereby forming a three-dimensional structure.

[0065] Referring back to FIG. 1(b), the first region 5 and the second region 6 arranged in the three-dimensional structure form a consistent, integrated three-dimensional image by the reconstructed point group due to 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 FIG. 1(b), and the second region 6 is visible from the lower side in FIG. 1(b). "Consistent" can mean that one pattern is inserted into an area without a pattern on the other side. "Consistent" can also mean that the patterns on the front and back form a single motif. The motif can be a letter, symbol, mark, or decoration.

[0066] Due to the phase shift structure formed in the first element cell 2, a first reconstructed image 7a is reconstructed at a distance from the laminate sheet 1a on the first surface (e.g., the front surface, which is the upper surface in the figure) of the laminate sheet 8, as shown in Fig. 3. Furthermore, due to the phase shift structure formed in the second element cell 3, a second reconstructed image 7b is reconstructed at a distance from the laminate sheet 1b on the second surface (e.g., the back surface, which is the lower surface in the figure) of the laminate sheet 8, as shown in Fig. 3.

[0067] Referring back to FIG. 2( b ), a first character (for example, a face) is recorded in the first region 5 , and this character is surrounded by a first outline region 9 .

[0068] Referring back to FIG. 2( d ), a second character (for example, a sun) is recorded in the second region 6 , and this character is surrounded by a second outline region 10 .

[0069] In the first contour region 9 and the second contour region 10, a plurality of first element cells 2 and a plurality of second element cells 3 are arranged, respectively, to form phase shift structures.

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

[0071] The first outline region 9 and the second outline 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 outline region 9 is visible from the front side, which is the upper side in the figures, and as shown in Figures 1(b) and 1(c), the second outline region 10 is visible from the back side, which is the lower side in the figures.

[0072] 3, the phase shift structure formed in the first element cell 2 reproduces a reproduced image 11b of the second outline region at a distance from the laminate sheet 1a on the first surface (e.g., the front surface, which is the upper side in the figure) of the laminate sheet 8. Also, the phase shift structure formed in the second element cell 3 reproduces a reproduced image 11a of the first outline region at a distance from the laminate sheet 1b on the second surface (e.g., the back surface, which is the lower side in the figure) of the laminate sheet 8.

[0073] In this way, the first reconstructed image 7a and the reconstructed image 11b of the second contour region can be reconstructed so as to overlap at the top in FIG. 3 . A sense of three-dimensionality is poor when only one of the first reconstructed image 7a and the reconstructed image 11b of the second contour region is displayed. However, the three-dimensional display device 4 can reconstruct the first reconstructed image 7a and the reconstructed image 11b of the second contour region so as to overlap, allowing the viewer to perceive a doubled sense of depth. It is also possible to make a portion of the surface formed by the point cloud in the first region 5 parallel to a portion of the surface formed by the point cloud in the second region 6. This makes it possible to display a multilayered composite image.

[0074] Similarly, the second reconstructed image 7b and the reconstructed image 11a of the first contour region can be reconstructed so as to overlap at the bottom in FIG. 3 . The sense of three-dimensionality is poor when only one of the second reconstructed image 7b and the reconstructed image 11a of the first contour region is displayed. However, the three-dimensional display device 4 can reconstruct the second reconstructed image 7b and the reconstructed image 11a of the first contour region so as to overlap, allowing the viewer to perceive a doubled sense of depth. It is also possible to make a portion of the surface formed by the point cloud of the first contour region 9 parallel to a portion of the surface formed by the point cloud of the second contour region 10. This makes it possible to display a composite reconstructed image in a layered manner.

[0075] Furthermore, in the three-dimensional display medium 4, a first region 5 for reproducing the first reconstructed image 7a and a second region 6 formed of a diffraction grating that diffracts light with a different pitch and azimuth angle in a specific direction can be arranged adjacent to each other within the three-dimensional display medium 4. Each of the first regions 5 may have a plurality of phase angle recording regions. Furthermore, the second region 6 may have a plurality of phase angle recording regions in which the recorded diffraction gratings have different pitches, azimuth angles, or both. The phase angle recording regions will be described later with reference to FIG. 10 .

[0076] In addition, 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 specific directions are arranged adjacent to each other by aligning the markers 19.

[0077] The first contour area 9 may also have a phase angle recording area (described later), and the second contour area 10 may also have a phase angle recording area (described later) in which the recorded diffraction grating has a different pitch, azimuth angle, or both.

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

[0079] The first region 5 and the first outline region 9, and the second region 6 and the second outline region 10 can be arranged adjacent to each other with a predetermined gap between them. In this case, however, the brightness of the reconstructed images 7a, 7b, 11a, and 11b becomes darker depending on 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 outline region 9, the second region 6, and the second outline region 10.

[0080] With an appropriate space between the first element cell 2 and the second element cell 3, the first element cell 2 and the second element cell 3 can be spaced apart via a spacer at a distance that allows the observer to view them simultaneously, and can be arranged nested at a certain ratio, for example. The certain ratio can be the ratio between the number of first element cells 2 and the number of second element cells 3 within a unit area of ​​a computational element partition, which will be described later. The first element cell 2 and the second element cell 3 can also be made the same size. Furthermore, the first element cell 2 and the second element cell 3 can be made the same shape.

[0081] The size of the first element cell 2 and the second element cell 3 can be 5 μm or more and 150 μm or less. This size can be the length of the short side of the first element cell 2 and the second element cell 3. It can also be the length of the short side of a rectangle circumscribing the first element cell 2 and the second element cell 3.

[0082] FIG. 1A(a) is a cross-sectional view of the three-dimensional display 4 shown in FIG. 1(b) covered with a single or multiple reflective layers 14. FIG.

[0083] FIG. 2A(a) corresponds to FIGS. 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 FIGS. 2(a) and 2(c) are covered with a single-layer or multi-layer reflective layer 14.

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

[0085] In FIG. 3A, the first distance Z1 indicates the distance from the first surface (e.g., the upper surface in the figure) of the laminate sheet 1a to the first reconstructed image 7a. The second distance Z2 indicates the distance from the second surface (e.g., the lower surface in the figure) of the laminate sheet 1b to the second reconstructed image 7b. The third distance Z3 indicates the distance from the second surface (e.g., the lower surface in the figure) of the laminate sheet 1b to the reconstructed image 11a of the first outline region. The fourth distance Z4 indicates the distance from the first surface (e.g., the upper surface in the figure) of the laminate sheet 1a to the reconstructed image 11b of the second outline region. In FIG. 3A, the relationships Z1<Z2 and Z4<Z3 are satisfied.

[0086] FIG. 4 is a diagram showing a reconstructed image that is reconstructed when the authenticator 100 shown in FIG. 3 is turned over.

[0087] In a case like Figure 4, opposite to Figure 3, the first reconstructed image 7a and the reconstructed image 11b of the second contour area are reconstructed at the bottom of the figure, spaced apart from the laminate sheet 1a, and the second reconstructed image 7b and the reconstructed image 11a of the first contour area are reconstructed at the top of the figure, spaced apart from the laminate sheet 1b.

[0088] FIG. 4A is a perspective view showing the positional relationship between the reconstructed images 7a, 7b, 11a, and 11b in FIG.

[0089] In FIG. 4A, the relationships Z1>Z2 and Z4>Z3 are the opposite of those in FIG. 3A.

[0090] 3 and 4 show that the first reconstructed image 7a and the second reconstructed 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 reconstructed image 7a and the second reconstructed image 7b recorded as a structure having a phase shift function in a phase angle recording region described later are reconstructed by illumination.

[0091] The first reconstructed image 7a, the second reconstructed image 7b, the first contour region reconstructed image 11a, and the second contour region reconstructed image 11b are each composed of a plurality of reconstructed points, i.e., are displayed as a group of reconstructed points.

[0092] Referring back to FIG. 3 , the first reconstructed image 7a represents a face, and the second reconstructed image 7b represents the sun. That is, the first reconstructed image 7a and the second reconstructed image 7b may be different. Furthermore, 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 may be 1:2 or more and 2:1 or less.

[0093] The size of the first reconstructed image 7 a can also be made smaller than the size of the second reconstructed image 7 b. In this case, for example, the ratio of the areas of the convex hulls of the first reconstructed image 7 a and the second reconstructed image 7 b can be set to 1:10 or more and less than 1:2.

[0094] The first reconstructed image 7a is reconstructed on the front side of the three-dimensional display body 4, that is, on the front side relative to the observer, and the second reconstructed image 7b is reconstructed on the back side relative to the observer. Figure 4 shows the situation on the back side, and the appearance situation is the opposite of the appearance situation 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 letters on a black background, and the reconstructed image 11b of the second contour region is shown in black letters 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. Furthermore, 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, in relation 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 1:2 or more and 2:1 or less.

[0096] The size of the reconstructed image 11 a of the first contour region can also be made smaller than the size of the reconstructed image 11 b of the second contour region. For example, the ratio of the areas of the convex hulls of the reconstructed image 11 a of the first contour region and the reconstructed image 11 b of the second contour region can be set to 1:10 or more and less than 1:2.

[0097] The reconstructed image 11b of the second contour area is reconstructed on the front side of the three-dimensional display 4, that is, on the front side relative to the observer, and the reconstructed image 11a of the first contour area is reconstructed on the back side relative to the observer. Figure 4 shows the situation on the back side, and the appearance situation is the opposite of the appearance situation shown in Figure 3 above.

[0098] As shown in Figure 3, the structure of the authentication device 100 with a phase shift function reproduces the first reproduced image 7a, the second reproduced image 7b, the reproduced image 11a of the first contour region, and the reproduced image 11b of the second contour region, which are planar reproduced images, in space at a distance from the three-dimensional display body 4. In other words, the structure with a phase shift function reproduces the planar reproduced images 7a, 7b, 11a, and 11b in space. The shapes of the reproduced images 7a, 7b, 11a, and 11b can also be curved. In this case, the three-dimensional effect obtained by the observer when observing increases in proportion to the reproduction distance of the reproduced images, i.e., the distance between the center of the reproduced images 7a, 7b, 11a, and 11b and the surface of the three-dimensional display body 4 (the aforementioned Z1, Z2, Z3, and Z4).

[0099] However, if the reproduction distance is too large, blurring of the image occurs under a point light source. Therefore, a range of reproduction distance is set so that blurring does not occur. As shown in Figure 3, the three-dimensional display body 4 reproduces the reproduced images 7a, 7b, 11a, and 11b in the space on the front side and the space on the back side of the three-dimensional display body 4, respectively. This makes it possible to increase the three-dimensional effect while suppressing blurring of the reproduced images 7a, 7b, 11a, and 11b.

[0100] In both Figures 3A and 4A, the reproduction distance Z1 from the three-dimensional display body 4 to the first reproduced image 7a is different from the reproduction distance Z2 from the three-dimensional display body 4 to the reproduced image 7b. However, Figure 4A shows an example in which the front and back surfaces of the three-dimensional display body 4 are reversed, and the two reproduced images 7a, 7a are reproduced in the opposite direction to Figure 3A.

[0101] 3A and 4A show cases where the reconstruction distance Z3 from the three-dimensional display medium 4 to the reconstructed image 11a of the first contour region is different from the reconstruction distance Z4 from the three-dimensional display medium 4 to the reconstructed image 11b of the second contour region. Fig. 3A shows an example in which the reconstructed images 11b, 11b of the first and second contour regions are reconstructed on different sides of the three-dimensional display medium 4, and Fig. 4A shows an example in which the front and back surfaces of the three-dimensional display medium 4 shown in Fig. 3A are reversed and the reconstructed images 11a, 11b of the first and second contour regions are reconstructed on the opposite side to Fig. 3A.

[0102] The security effect achieved by the three-dimensional display body 4 will be described with reference to FIGS. 3A and 4A.

[0103] 3A, the reconstruction distance Z1 from the three-dimensional display body 4 to the first reconstructed image 7a is different from the reconstruction distance Z2 from the three-dimensional display body 4 to the second reconstructed image 7b, and they have the relationship Z2<Z1. Also, the reconstruction distance Z3 from the three-dimensional display body 4 to the reconstructed image 11a of the first outline region is different from the reconstruction distance Z4 from the three-dimensional display body 4 to the reconstructed image 11b of the second outline region, and they have the relationship Z4<Z3.

[0104] On the other hand, the example shown in Figure 4A shows the state when the three-dimensional display body 4 shown in Figure 3A is viewed from the back side, and the opposite effect to that shown in Figure 3A is obtained, with the relationships Z1 < Z2 and Z3 < Z4.

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

[0106] Similarly, the three-dimensional display body 4 can be configured so that the reconstructed image 11a of the first contour area and the reconstructed image 11b of the second contour area are all reconstructed on the front side, or conversely, all reconstructed on the back side.

[0107] 3, under ambient lighting, when observed from the front, i.e., from the normal direction to the surface of the laminate sheet 1a, the first reconstructed image 7a and the reconstructed image 11b of the second outline region can be seen. However, as the observation direction deviates from the front direction and the value of the field of view increases, the reconstructed images 7a and 11b become blurred and cannot be seen, while only the second reconstructed image 7b and the reconstructed image 11a of the first outline region can be seen.

[0108] However, under illumination by a point light source instead of ambient lighting, even if the values ​​of the reconstruction distances Z2 and Z3 and the field of view angle are increased, the first reconstructed image 7a and the reconstructed image 11a of the first contour region can be clearly seen. Also, 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 seen by comparing the first reconstructed image 7a and the second reconstructed image 7b.

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

[0110] The structure having a phase shift function can be recorded as a relief structure or as a modulation of the refractive index in a phase angle recording region, which will be described later.

[0111] The phase difference is recorded as a relief structure as follows. First, a resist plate, in which an electron beam resist is coated on a glass plate, is exposed to an electron beam at a dose corresponding to the amount of phase shift, and the resist plate is developed to form a textured surface corresponding to the amount of phase shift. Next, a metal layer is deposited on the textured surface formed on the resist plate to create a master plate. Next, a nickel shim is replicated from the master plate by electroforming. The replicated shim is embossed onto a film in which a resin is coated on a carrier, thereby recording a relief structure in the resin. This structure having a phase shift function recorded as a relief structure is highly suitable for mass production. 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 three-dimensional display body 4 on which the relief structure is recorded can be destroyed if it is heated and peeled off from the adherend for tampering, thereby providing high tamper resistance.

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

[0113] When creating a double-sided relief structure, alignment markers 19 are placed in the margins of the laminate sheet, and two relief structures consisting of one surface including the first region 5, the first contour region 9, the second region 6, and the second contour region 10 are created.The two relief structures are then aligned using the respective markers 19, and the two relief structures are then laminated together.The margins including the markers are then removed by cutting or demetallizing, leaving them as a pattern.

[0114] Next, a method for forming the three-dimensional structure of the three-dimensional display body 4 will be described with reference to FIGS. 5 and 6, FIGS. 7A and 7B, and FIGS. 8A and 8B.

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

[0116] As shown in Figures 5(a), 7A(a), and 7B(a), a laser irradiation device 12a irradiates one or both surfaces of the three-dimensional display body 4 with a strong laser beam 13a. As a result, the first element cells 2 and / or the second element cells 3, which are three-dimensional structures formed from resin, melt, and the single-layer or multi-layer reflective layer 14 on the laminate sheet 1 evaporates, whereby 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 may be an infrared laser with a wavelength of 1064 nm, a YVO / YAG laser, a fiber laser, or a CO laser with a wavelength of 10600 nm. ２ A laser (gas laser) can be used.

[0118] The reflective layer 14 can be made of a metal, 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 reproduced image recorded in the recording area for a long period of time.

[0119] The metal sulfide can be zinc sulfide. The metal oxide can be titanium oxide. The metal fluoride can be magnesium fluoride. The metal can be aluminum, silver, tin, nickel, chromium, or gold, either alone or as an alloy. Aluminum, in particular, forms a passive layer, making it highly durable and allowing the reproduced image recorded in the recording area to be retained 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 surfaces with weak laser light 13b from a laser irradiation device 12b, it is possible to remove only the single-layer or multi-layer reflective layer 14 while leaving the first element cells 2 and / or the second element cells 3, or to remove only a part of the reflective layer 14, by using materials with different wavelength absorptances, as shown in Figures 6(b), 8A(b) and 7B(b).

[0121] Materials with different wavelength absorption rates can be metal compounds, such as zinc sulfide, alumina, and titanium oxide. These metal compounds are resistant to chemical changes and can retain the reproduced image stored in the memory area for a long period of time.

[0122] This can halve the effect of the reflective layer 14. Furthermore, by molding the first element cells 2 and the second element cells 3 that form the three-dimensional structure from 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] In this way, it is possible to create a card that is difficult to counterfeit by transferring a three-dimensional hologram foil to the front and back of the transparent window portion 23 formed by demetallizing with a laser. An example of applying this to a passport will be described below.

[0124] FIG. 9 shows an example of a passport in which a three-dimensional hologram foil is transferred onto the front and back of the transparent window portion.

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

[0126] With this passport 40, even if the first facial image 41 is tampered with, it is possible to detect the tampering by detecting the discrepancy with the second facial image 42 formed in the transparent window. Also, it is possible to visually detect a counterfeit product by detecting the misalignment of the three-dimensional patterns on the front and back.

[0127] Next, a method for recording the phase calculated by the CGH in the phase angle recording areas of the first area 5, the first contour area 9, the second area 6, and the second contour area 10 will be described.

[0128] FIG. 10 is a diagram for explaining a phase angle recording area for recording a phase calculated by a CGH.

[0129] The three-dimensional display body 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 section 15, a phase angle recording region 16, and a phase angle non-recording region 17, as described in Patent Document 7.

[0130] The positional relationship between the computational element section 15, the phase angle recording area 16, and the phase angle non-recording area 17 will be explained using an XYZ orthogonal coordinate system.

[0131] When light is incident from a direction intersecting the pixel surface, the incident light is modulated by the pixel surface, resulting in a reconstructed image. The reconstructed image is an image of multiple reconstruction points. The reconstruction points are preferably located at positions spaced apart from the pixel surface in the Z direction by at least 5 mm and at most 25 mm.

[0132] When the pixel plane is viewed from a reconstruction point of interest, the range in which a reconstruction image is reproduced in the viewing angle direction is called the viewing angle θ. In the following description, the viewing angle direction is the X direction or the Y direction. The viewing angle θ from the reconstruction point is defined by the following equation (1).

[0133] θ<(A / m) (1) Here, if (λ / 2d)≦1, the following equation (2) is obtained.

[0134] A=asin(λ / 2d) (2) where λ is the wavelength of light, d is the arrangement interval of the unit blocks in the viewing angle direction, and m is a real number of 3 or more.

[0135] Specifically, the wavelength λ of the light can be 555 nm, which is the maximum relative luminosity of humans among visible light. The arrangement interval d can be the distance between the centers of the unit blocks. The arrangement interval d of the unit blocks can be 10 nm or more and 200 nm or less.

[0136] The viewing angle θ is determined by the range in the X direction when the pixel surface is viewed from a reproduction point of interest, and is ½ of the angle 2θ formed by the minimum value Xmin in the X direction, the maximum value Xmax in the X direction, and the reproduction point of interest. Note that the X and Y directions correspond to the X and Y coordinate axes of a Euclidean coordinate system, where the X direction is the direction in which the pixel surface extends, and the Y direction is the direction perpendicular to the X direction.

[0137] The viewing angle θ when the viewing angle direction is the Y direction is also defined in a similar manner. That is, the viewing angle θ is determined by the range in the Y direction when the relief surface is viewed from a reproduction point of interest, and is ½ of the angle 2θ formed by the minimum value Ymin in the Y direction, the maximum value Ymax in the Y direction, and the reproduction point of interest. Therefore, the arrangement interval d of the unit blocks corresponds to the arrangement interval dx of the unit blocks in the X direction when the viewing angle direction is the X direction, and corresponds to the arrangement interval dy of the first element cell 2 and the second element cell 3 in the Y direction when the viewing angle direction is the Y direction.

[0138] For this reason, the computational element partition 15 is generally a square or a rectangle. However, the computational element partition 15 may be a polygon other than a rectangle, or a circle or an ellipse. As for polygons, in addition to squares and rectangles, hexagons are also suitable. When the computational element partition 15 is a shape other than a square or a rectangle, the minimum value (lower limit) of the X direction of the computational element partition 15 is defined as Xmin, and the maximum value (upper limit) of the X direction of the computational element partition 15 is defined as Xmax. Similarly, the minimum value of the Y direction of the computational element partition 15 is defined as Ymin, and the maximum value of the Y direction of the computational element partition 15 is defined as Ymax.

[0139] When the shape of a unit block is square or rectangular, the corners of the square or rectangle are actually rounded to form a rounded rectangle. Furthermore, a unit block may be fused with an adjacent unit block. In this case, even if the shape of each unit block is a rounded rectangle, the shape of the fused unit blocks will not be a rounded rectangle but will be deformed, but the optical effect will not change even if the shape is deformed by fusion. It is preferable that the unit blocks are arranged in an orderly fashion. The orderly array can be an array at intervals within a certain range or an array at equal intervals. Typical orderly arrays include a square array and a hexagonal array.

[0140] As is clear from the above equation (1), the field of view angle θ is less than A. When light passes through this phase component and is diffracted, theoretically, diffraction exceeding A does not occur. Therefore, when performing hologram calculations using a computer, the field of view angle θ can be set as the upper limit of the calculation range. By limiting the calculation range in this way, calculation time can be shortened. Furthermore, even if calculations are performed for a range exceeding the field of view angle θ, the calculations are simply for diffraction that does not theoretically exist, and the results only contribute as noise. However, in the above calculations, since calculations for a range exceeding the field of view angle θ are not performed, noise is not superimposed when the reconstructed image is reconstructed at the reconstruction point.

[0141] Each of the phase angle recording area 16 and the phase angle non-recording area 17 includes a plurality of unit blocks. For unit blocks included in an overlapping area of ​​the phase angle recording area 16 that overlaps with the computational element partition 15, a phase angle is calculated by a computer based on the phase component, and the calculated phase angle is recorded in the unit block included in the overlapping area.

[0142] In this way, the computational element sections 15 are defined on the pixel surface in accordance with the viewing angle θ. In this way, the computational element sections 15 are defined independently of the phase angle recording areas 16 and the phase angle non-recording areas 17, and therefore usually overlap with the phase angle recording areas 16 and the phase angle non-recording areas 17, respectively.

[0143] The computational element blocks 15 correspond one-to-one to each reconstruction point of the reconstructed image, and the phase component of light from each reconstruction point is calculated. Since there are multiple reconstruction points, there are also multiple computational element blocks 15, the same number as the reconstruction points, and the phase component of light from each reconstruction point is calculated for each of these multiple computational element blocks 15.

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

[0145] The phase angle non-recorded area 17 is an area where the phase angle is not recorded, and is, for example, a mirror surface.

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

[0147] In the phase angle non-recorded area 17, information other than the phase angle, such as the scattering, reflection, and diffraction characteristics of light, can be recorded.

[0148] 11A is a cross-sectional view of the laminate 30 before the three-dimensional display device 4 is enclosed, and FIG. 11B is a cross-sectional view of the laminate 30 after the three-dimensional display device 4 is enclosed. The overall thickness can be set within a range of 0.18 mm or more and 0.84 mm or less, for example, according to JIS X6311 and JIS X6301 (ISO / IEC7810).

[0149] The laminate 30 is formed by laminating, from the top in the figure, a transparent protective layer 31 which is a transparent outer layer substrate, a phase modulation layer 32 which receives and modulates illumination light, a print layer 33 which is a transparent intermediate substrate which develops color in response to laser light, a core layer 34 which is a core substrate, the print 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 three-dimensional display body 4 are visible from the outside of the laminate 30.

[0150] By encapsulating the three-dimensional display body 4 in the inner encapsulation portion 25, which is a transparent, non-printed portion that is part of the core layer 34, a laminate 30 containing the three-dimensional display body 4 can be created, as shown in Figure 11 (b).

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

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

[0153] The laminate sheet 1 on which the three-dimensional display body 4 is arranged can be attached to an adherend, such as a printed notebook, a printed page, or a printed card, via the adhesive region 18 as shown in Figures 1B and 2B. The adhesive region 18 can also be attached to the adherend by hot stamping. By attaching the three-dimensional display body 4 to the adherend in this manner, an authentication body 100 including the three-dimensional display body 4 can be obtained.

[0154] An example of the authenticator 100 is a card. The card can be an ID card, a license card, or a game card. The ID card can be a national ID card, a foreign resident card, or a tax card. The booklet can be a passport.

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

[0156] Referring back to Figure 11, the phase modulation layer 32 can be multi-layered. The phase modulation layer 32 can be configured by laminating an embossed layer, a reflective layer, and a mask layer in this order. The reflective layer and mask layer can be omitted. The transparent protective layer 31 can be made of a thermoplastic polymer. The embossed layer can be made of a hardened polymer. The reflective layer can be made of an inorganic material. 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 multi-layer by deposition. The deposition can be physical deposition or chemical deposition. The physical deposition can be vacuum deposition or sputtering. The mask layer can be formed by printing ink. The 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 embossing layer can be a single layer or a composite layer. The composite layer can be composed of a relief layer, an intermediate portion, and an anchor layer. The relief layer can be a hardened polymer. The anchor layer can be a thermoset polymer. The intermediate layer can be a blend.

[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 the resin include acrylic resin, polyester resin, polyamide resin, and cellulose resin. Waxes such as polyethylene powder, paraffin wax, silicone, and carnauba wax can also be used as lubricants. These can be formed as a release layer on the base layer by known coating methods such as gravure printing and 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 embossing 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 middle part can be a mixture of polyacrylate and polyurethane acrylate. The material of the anchor layer can be polyurethane acrylate.

[0160] Furthermore, a transparent protective layer 31, a phase modulation layer 32, a printing layer 33, and a core layer 34 containing a three-dimensional display body 4 in an inner container portion 35 can be laminated in this order by heat and pressure, and then integrated by heat and pressure bonding to form a laminate 30 as shown in Figure 11(b). The laminate 30 can be made into a card, tag, or booklet page. This allows the formation of an authentication body with a security label.

[0161] A reflective / scattering layer (not shown) may also be provided as an additional element. The reflective / scattering layer may be made of a functional ink whose color changes depending on the illumination angle or observation angle. Examples of such functional inks include optically variable ink, color-shifting ink, and pearl ink.

[0162] Next, printing using the arrangement of the first area 5, the first contour area 9, the second area 6, and the second contour area 10 will be described.

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

[0164] The second area 6 can record data other than the personal identification information including the biometric information of the first area 5. For example, by having binarized gradation values ​​for each calculation element section 15 based on the first area 5, hash information related to the ID card owner stored in the first area 5 can be reproduced as the second reproduced image 7b.

[0165] The first contour region 9 has gradation values ​​for each color as data of a color image expressed in two or more colors for each computational element partition 15. The second contour region 10 also has binarized gradation values ​​for each computational element partition 15 based on the first contour region 9.

[0166] This allows the first outline area 9 and the second outline area 10 to record characters of personal identification information including biometric information related to the first area 5 and the second area 6. For example, hash information related to the ID card owner recorded in the first area 5 and the second area 6 can be reproduced as the reproduced image 11a of the first outline area and the reproduced image 11b of the second outline area, thereby improving the design.

[0167] Furthermore, the first outline region 9 and the second outline region 10 can be used to prevent counterfeiting of the first region 5 and the second region 6. For example, the first region 5 and the first outline region 9 can be combined, and the element cells on the region can be arranged so that they overlap the two regions, so that a counterfeit made by peeling off the original product or the like can reproduce a reproduced image that is clearly a counterfeit.

[0168] Next, specific manufacturing of cards according to embodiments of the present invention will be described in the following examples, again with reference to FIG.

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

[0170] Next, the three-dimensional display body 4 formed on a laminate sheet was partially hot stamped onto the print layer 33, and then the transparent protective layer 31, the phase modulation layer 32, the print layer 33, and the core layer 34 with the three-dimensional display body 4 arranged in the inner container part 25 were laminated in this order, and the resultant was heated and pressed with a plate at 180 degrees, and then cooled. The resultant was then punched into 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 arranging a plurality of first element cells 2 on the front side of the three-dimensional display body 4, which reproduce a reproduced image 7a showing a facial motif as a group of a plurality of reproduced points at a reproduction distance Z1 = 2 mm from the front side of the three-dimensional display body 4, and a plurality of 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 a plurality of reproduced points at a reproduction distance Z2 = 2 mm from the back side of the three-dimensional display body 4, in a nested manner in a first region 5 and a second region 6.

[0172] By observing the card with the three-dimensional display body 4 attached under a point light source, the observer can feel 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 such as a surface light source or indirect lighting, only the reconstructed image of the face 7a, which was reconstructed 2 mm from the front side of the three-dimensional display body 4, was visible on the front side of the three-dimensional display body 4, but by illuminating it with a point light source, the reconstructed image of the sun 7b, which was reconstructed 2 mm from the back side of the three-dimensional display body 4, was visible on the front side of the three-dimensional display body 4. Electroformed plate production

[0173] A master with a relief structure formed as an uneven surface on a resist plate was formed by electron beam lithography, and a conductive film was formed on the surface of the master by deposition, after which a shim was replicated by electroforming. Preparation of transfer foil

[0174] The three-dimensional display element 4 was fabricated by coating a peelable transparent protective layer 31 on a PET film carrier, then coating a precursor on the transparent protective layer 31 to a dry thickness of 3 μm to form an embossed layer. A shim having an uneven surface formed by electroforming on the surface of the embossed layer was then pressed with heat and UV irradiation to form an uneven surface, forming a relief structure on the embossed layer. An aluminum reflective layer was then formed on the surface of the embossed layer with the relief structure by vacuum deposition. An adhesive was then applied to the reflective layer to form an adhesive layer. These coating materials may be diluted with a solvent.

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

[0176] Although the best mode for carrying out the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such a configuration. Those skilled in the art may conceive of various modifications and alterations within the scope of the technical ideas of the invention as defined in the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention.

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

Claims

1. A three-dimensional display body in which a first element cell in which personal identification information is recorded and a second element cell including an authentication body capable of visually recognizing the personal identification information are arranged on a laminate sheet, having a first region and a second region formed by arranging a plurality of the first element cells and the second element cells respectively, a phase shift structure is formed in each of the first element cell and the second element cell, in each of the first region and the second region, the first element cell and the second element cell are arranged to be separated from each other via a spacer, thereby forming a three-dimensional structure, the first region and the second region arranged in the three-dimensional structure form an integral three-dimensional image in which the reproduction point groups by the reflected light of the phase shift structure are coherent, due to the phase shift structure formed in the first element cell, a first reproduction image is reproduced on the first surface side of the laminate sheet, separated from the laminate sheet, A three-dimensional display body, characterized in that a second reproduction image is reproduced on the second surface side of the laminate sheet, separated from the laminate sheet, due to the phase shift structure formed in the second element cell.

2. A three-dimensional display body in which 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 in which personal identification information is recorded and a second element cell including an authentication body capable of visually recognizing the personal identification information are arranged respectively, thereby forming a phase shift structure respectively, in each of the first contour region and the second contour region, the first element cell and the second element cell are arranged in a nested manner at a predetermined ratio, thereby forming a three-dimensional structure, the first contour region and the second contour region are visible from different surface sides of the laminate sheet respectively, due to the phase shift structure formed in the first element cell, a reproduction image of the second contour region is reproduced on the first surface side of the laminate sheet, separated from the laminate sheet, A three-dimensional display body, characterized in that 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, by a phase shift structure formed in the second element cell.

3. A three-dimensional display body, characterized in that it is configured by connecting a first three-dimensional display body which is the three-dimensional display body according to claim 1 and a second three-dimensional display body which is the three-dimensional display body according to claim 2.

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

5. The three-dimensional display body according to claim 4, characterized in that the first three-dimensional display body and the second three-dimensional display body are connected by overlapping them.

6. A three-dimensional display body according to claim 1, 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.

7. A three-dimensional display body according to claim 1, 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.

8. A three-dimensional display body according to claim 2, 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.

9. A three-dimensional display body according to claim 2, 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.

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

11. The laminate sheet has a recording surface, and on the recording surface, A calculation element section that corresponds one-to-one to each reproduction point of the reproduction image of the first contour area and the reproduction image of the second contour area, and in which the phase component of light from each reproduction point is calculated; A phase angle recording area capable of recording a phase angle calculated based on the phase component; A phase angle non-recording area where the phase angle is not recorded is provided; The three-dimensional display according to claim 2, wherein the phase angle is recorded in an overlapping area where the calculation element section and the phase angle recording area overlap.

12. There are a plurality of the calculation element sections, The phase component of light from each reproduction point is calculated for each calculation element section of the plurality of calculation element sections, The three-dimensional display according to claim 10 or 11, wherein the calculated phase angle is recorded for each calculation element section.

13. The three-dimensional display according to claim 10 or 11, wherein information other than the phase angle is recorded in the phase angle non-recording area.

14. The three-dimensional display according to claim 13, wherein the information other than the phase angle is information including at least any one of light scattering, reflection, and diffraction characteristics.

15. The first area has gradation values for each color for each calculation element section as data of a color image represented by two or more colors, The three-dimensional display according to claim 10, wherein the second area has binarized gradation values for each calculation element section based on the first area.

16. The first contour area has gradation values for each color for each calculation element section as data of a color image represented by two or more colors, The three-dimensional display according to claim 11, wherein the second contour area has binarized gradation values for each calculation element section based on the first contour area.

17. An authentication body comprising a laminate in which a transparent outer layer base material, a phase shift base material that modulates upon receiving illumination light, a transparent intermediate base material that develops color upon receiving laser light, and a core base material are laminated, having a transparent non-printing portion in at least a part of the core base material, An authentication body, characterized in that the three-dimensional display body according to claim 1 is included in the laminate.

18. 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.

19. A method for forming the three-dimensional structure in the three-dimensional display body according to claim 1, A forming method, 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 the outside of the three-dimensional display body.