JP5637371B2 - Image display body, transfer foil, and labeled article - Google Patents

Description

  The present invention relates to an image display technique that can be used for personal authentication, for example.

  Many personal authentication media such as passports and ID (identification) cards use facial images to enable visual personal authentication.

  For example, in a passport, conventionally, photographic paper on which a face image is printed is pasted on a booklet. However, such passports may be tampered with by reprinting photographic prints.

  For these reasons, in recent years, there is a tendency to digitize facial image information and reproduce it on a booklet. As this image reproduction method, for example, a thermal transfer recording method using a transfer ribbon has been studied.

  However, recently, thermal transfer recording type printers using sublimation dyes or colored thermoplastic resins are widely used. Considering this situation, it is not always difficult to remove a face image from a passport and record another face image on the face image.

  Patent Document 1 describes that a face image is recorded by the method described above, and a face image is recorded thereon using fluorescent ink. Patent Document 2 describes that a face image is recorded using an ink containing a colorless or light-colored fluorescent dye and a colored pigment. Further, Patent Document 3 describes that a normal face image and a face image formed using a pearl pigment are arranged side by side.

  When these technologies are applied to a passport, the alteration becomes more difficult. However, a face image recorded using a fluorescent material cannot be observed unless a special light source such as an ultraviolet lamp is used. In addition, although a face image formed using a pearl pigment can be visually recognized with the naked eye, it is difficult to form a high-definition image using this because the pearl pigment has a large particle size.

  Patent Document 4 describes that a multilayer film is transferred from a transfer ribbon onto a substrate. Further, Patent Document 4 describes that multilayer films having different display colors are juxtaposed in order to display a color image.

  Usually, an image displayed by a multilayer film pattern cannot be reproduced using a generally available transfer ribbon, and can be visually recognized with the naked eye. Further, according to the method of transferring a multilayer film, it is possible to achieve an excellent image quality as compared with the case of using a pearl pigment. This technique is suitable for recording images on demand, and is expected to be applied to recording personal information.

JP 2000-141863 A JP 2002-226740 A Japanese Patent Laid-Open No. 2003-170685 JP 10-49647 A

  The present inventors believe that if an image showing a more complicated visual effect can be displayed with high image quality, the effect of suppressing fraud is further improved. Therefore, the present invention is capable of displaying an image showing a complicated visual effect with high image quality.

A first aspect of the present invention is an image display body that displays an image that can be viewed with the naked eye by an observer observing the front surface when the front surface is illuminated with natural light, and includes a plurality of two-dimensionally arranged images. And a first display element having visible light transparency, wherein the first display element is provided with at least a part of the first relief structure. A first light transmission layer having a first main surface; and a first reflective layer covering the first main surface, wherein at least one of the pixels including the first display element is visible light A second display element having transparency is further provided in front of the first display element, and the second display element has a second main surface at least partially provided with a second relief structure. A second light transmission layer and a second reflective layer covering the second main surface, wherein the second main surface Regions whose serial second relief structure is provided, the area compared to the first region of the relief structure is provided in the first main surface are smaller, other one or more of the plurality of pixels is Orazu provided with the first display element, prior SL includes a second display element, the arrangement of the first relief structure, the first image when viewed from the first direction under certain lighting conditions Is displayed as a structural color image, and the first image is not displayed as a structural color image when viewed from a second direction different from the first direction under the illumination conditions, or the first image is not displayed. The image is displayed as an image having a darker structural color than that observed from the first direction, and the second relief structure is arranged as a second image when observed from the second direction under the illumination conditions. As a structural color image, and under the lighting conditions, An image display body that does not display the second image as a structural color image when viewed from one direction or displays the second image as a darker structural color image than when viewed from the second direction It is.

  According to a second aspect of the present invention, at least one of the plurality of pixels includes the first display element, does not include the second display element, includes the first display element, and Each of the pixels not provided with the second display element has a visible light transmission and a luminance adjustment element that does not display a structural color is further provided in front of the first display element. It is an image display.

  According to a third aspect of the present invention, the brightness adjusting element is a second side surface having the same structure, material, and dimensions as the second display element, except that the second relief structure is not provided on the second main surface. This is an image display body.

  A fourth aspect of the present invention is the image display body according to any one of the first to third aspects, further comprising a specular reflection layer behind the plurality of pixels.

  A fifth aspect of the present invention is the image display according to any one of the first to fourth aspects, wherein each of the first and second relief structures is a diffraction grating or a hologram.

  According to a sixth aspect of the present invention, the first and second relief structures and their arrangement are such that the observer visually recognizes one of the first and second images with the right eye and the first and second with the left eye. The image display body according to any one of the first to fifth side surfaces configured to perceive a stereoscopic image when the other of the two images is visually recognized.

  According to a seventh aspect of the present invention, the first relief structure displays a first structural color when observed from the first direction under the illumination condition, and the first relief structure is under the illumination condition. A second structural color that is different from the first structural color when viewed from one direction, and the first and second structural colors when viewed from the first direction under the illumination conditions. Including a different third structural color, and the second relief structure displays a fourth structural color when observed from the second direction under the illumination condition, and the illumination condition. Display a fifth structural color different from the fourth structural color when observed from the second direction under the illumination condition, and the fourth when viewed from the second direction under the illumination condition. And displaying a sixth structural color different from the fifth structural color, And each of the second image is an image display body according to any one of the first to sixth aspect is a multi-color image.

  An eighth aspect of the present invention is the image display body according to any one of the first to seventh aspects, wherein at least one of the first and second images includes personal information.

  According to a ninth aspect of the present invention, there is provided an image display body that displays an image that can be viewed with the naked eye by an observer observing the front surface when the front surface is illuminated with natural light. And a first display element having visible light transparency, wherein the first display element is provided with at least a part of the first relief structure. A first light-transmitting layer having a first main surface; and a first reflective layer covering the first main surface, wherein the first relief structure is a first diffraction layer under specific illumination conditions. The other one or more of the plurality of pixels are configured not to include the first display element, and include a second display element having visible light transmittance, and the first display element is configured to emit light. The second display element has a second light transmission layer having a second main surface provided with at least a part of the second relief structure. A second reflective layer covering the second main surface, wherein the second relief structure is arranged in a direction in which the first relief structure emits the first diffracted light under the illumination conditions. The second diffracted light is configured to emit second diffracted light having a wavelength different from that of the first diffracted light, and the region of the second main surface where the second relief structure is provided is the first main surface of the first diffracted light. The area of the pixel including the first display element is smaller than the area where the one relief structure is provided, and the part of the pixel including the first display element further includes the second display element in front of the first display element. The image display body, when observed from the direction under the illumination condition, the region corresponding to the pixel including only the first display element among the first and second display elements, Before having only the second display element of the first and second display elements A region corresponding to the pixel, the hue and the corresponding region in the pixel having both the first and second display element is an image display body which displays an image of the different structural color.

  A tenth aspect of the present invention is the image display body according to the ninth aspect, wherein the structural color image includes personal information.

  An eleventh aspect of the present invention is the image display according to the eighth or tenth aspect, wherein the personal information includes a face image.

  A twelfth aspect of the present invention is a transfer foil including the image display body according to any one of the first to eleventh aspects and a support body that releasably supports the image display body on the front surface side.

  A thirteenth aspect of the present invention is a labeled article comprising the image display body according to any one of the first to eleventh aspects and a base material supporting the image display body.

  The fourteenth aspect of the present invention is a labeled article according to the thirteenth aspect used for personal authentication.

  According to the present invention, an image showing a complicated visual effect can be displayed with high image quality.

  The image display body according to the first aspect of the present invention includes first and second relief structures. The arrangement of the first relief structure displays the first image as a structural color image when viewed from the first direction under a specific illumination condition, and is different from the first direction under the illumination condition. When viewed from two directions, the first image is not displayed as a structural color image, or the first image is displayed as a darker structural color image as compared with the first image viewed from the first direction. The second relief structure is arranged in such a manner that the second image is displayed as a structural color image when viewed from the second direction under the illumination condition and is observed from the first direction under the illumination condition. The second image is not displayed as a structural color image, or the second image is displayed as a darker structural color image compared to a case where the second image is observed from the second direction. Therefore, for example, a three-dimensional image can be displayed on the image display body, or different images can be displayed depending on the observation direction. That is, this image display body shows a complicated visual effect.

  In addition, when the first and second relief structures are provided on the same plane, in order to display both the first and second images in the same region, each pixel is divided into a sub-pixel for the first relief structure and a second pixel. It must be divided into sub-pixels for the relief structure. In this case, to achieve high resolution, the first and second sub-pixels must be significantly reduced. Such an image display is particularly difficult to manufacture in a process of recording an image on demand. Therefore, it is difficult to achieve high resolution.

  On the other hand, in the image display body according to the first aspect, the second display element including the second relief structure is disposed in front of the first display element including the first relief structure. When this configuration is adopted, it is not necessary to arrange the first and second sub-pixels alternately. Accordingly, the above-described problem does not occur, and high resolution can be achieved relatively easily. That is, an image can be displayed with high image quality.

  Furthermore, in the image display body according to the first aspect, both the first and second display elements are visible light transmissive. Therefore, for example, it is possible to employ the same laminated structure or use the same material for the first and second display elements. Therefore, the ratio of the brightness of the first image when observed from the first direction to the brightness of the second image when observed from the second direction is, for example, the area of the region where the first relief structure is provided. It can control based on ratio with the area of the area | region in which the 2nd relief structure is provided. That is, the image display body can easily control the brightness of the image.

  The image display body according to the second aspect of the present invention employs the following configuration in addition to the configuration described above for the image display body according to the first aspect. That is, one or more of the plurality of pixels includes the first display element and does not include the second display element. Each of the pixels including the first display element and not including the second display element has a visible light transmission property and a brightness adjustment element that does not display a structural color is further provided in front of the first display element. I have. When this configuration is adopted, for example, when observed from the first direction, a pixel that includes the first display element and does not include the second display element does not include the second display element. It is possible to prevent a color different from that of a pixel including both the first and second display elements from being seen.

  The image display body according to the third aspect of the present invention employs the configuration described above for the image display body according to the second aspect. In the image display body according to the third aspect, the brightness adjustment element has the same structure, material, and dimensions as the second display element except that the second relief structure is not provided on the second main surface. When this configuration is adopted, for example, when observed from the first direction, a pixel that includes the first display element and does not include the second display element does not include the second display element. It is possible to more reliably prevent the color from being different from that of the pixel including both the first and second display elements.

  The image display body according to the fourth aspect of the present invention employs the configuration described above for any of the first to third aspects, and further includes a specular reflection layer behind the plurality of pixels. . By adopting this configuration, it is possible to display a brighter image.

  The image display body according to the fifth aspect of the present invention employs the configuration described above for any one of the first to fourth aspects, and each of the first and second relief structures is a diffraction grating or a hologram. is there. Therefore, the first and second images can cause a color change, for example, by changing the viewing direction. That is, by adopting this configuration, a more complicated visual effect can be achieved. Further, it is difficult to counterfeit an image display body that achieves such a visual effect.

  The image display body according to the sixth aspect of the present invention employs the configuration described above for any of the first to fifth aspects. In addition, in the image display body according to the sixth aspect, the first and second relief structures and their arrangement are such that the viewer can visually recognize one of the first and second images with the right eye and the first and second with the left eye. A stereoscopic image is perceived when the other of the second images is visually recognized. An image display that achieves such a visual effect is difficult to counterfeit.

  The image display body according to the seventh aspect of the present invention employs the following configuration in addition to the configuration described above for any one of the first to sixth sides. That is, the first relief structure displays the first structural color when observed from the first direction under the illumination conditions, and the first relief structure when observed from the first direction under the illumination conditions. One that displays a second structural color different from the structural color, and one that displays a third structural color different from the first and second structural colors when observed from the first direction under the illumination conditions. Contains. The second relief structure displays the fourth structural color when observed from the second direction under the illumination conditions, and the fourth structural color when observed from the second direction under the illumination conditions. Including a display device that displays a fifth structural color different from the first structural color and a display device that displays a sixth structural color different from the fourth and fifth structural colors when viewed from the second direction under the illumination conditions. Yes. An image display body employing this configuration can display a multicolor image as each of the first and second images.

  The image display body according to the eighth aspect of the present invention employs the configuration described above for any of the first to seventh aspects, and at least one of the first and second images includes personal information. It is out. It is very difficult to falsify the personal information displayed by this image display body.

  The image display body which concerns on the 9th side surface of this invention contains the 1st and 2nd relief structure. When viewed from the first direction under a specific illumination condition, the image display body includes a region corresponding to a pixel including only the first display element among the first and second display elements, An image of a structural color having a different hue is displayed in an area corresponding to a pixel having only the second display element among the second display elements and an area corresponding to a pixel having both the first and second display elements. . This image causes a color change according to the illumination direction and the observation direction. That is, this image display body shows a complicated visual effect.

  Further, when the first and second relief structures are provided on the same plane, in order to perform multicolor display using additive color mixing, each pixel is divided into a sub-pixel for the first relief structure and a second relief structure. It must be divided into sub-pixels. In this case, to achieve high resolution, the first and second sub-pixels must be significantly reduced. Such an image display is particularly difficult to manufacture in a process of recording an image on demand. Therefore, it is difficult to achieve high resolution.

  In contrast, in the image display body according to the ninth aspect, the second display element including the second relief structure is disposed in front of the first display element including the first relief structure. When this configuration is adopted, it is not necessary to arrange the first and second sub-pixels alternately. Accordingly, the above-described problem does not occur, and high resolution can be achieved relatively easily. That is, an image can be displayed with high image quality.

  Furthermore, in the image display body according to the ninth aspect, both the first and second display elements are visible light transmissive. Therefore, for example, it is possible to employ the same laminated structure or use the same material for the first and second display elements. Accordingly, the ratio between the brightness of the structural color displayed on the first relief structure and the brightness of the structural color displayed on the second relief structure is determined by, for example, determining the area of the region where the first relief structure is provided and the second relief structure. Can be controlled on the basis of the ratio to the area of the region provided. That is, the image display body can easily control the brightness of the image.

  The image display body according to the tenth aspect of the present invention employs the configuration described above for the ninth aspect, and at least one of the images includes personal information. It is very difficult to falsify the personal information displayed by this image display body.

  The image display body according to the eleventh aspect of the present invention employs the configuration described above for the eighth or tenth aspects, and the personal information includes a face image. A face image is common as biometric information, and is suitable for visual personal authentication.

  The transfer foil according to the twelfth aspect of the present invention includes the image display body according to any one of the first to eleventh aspects, and a support that releasably supports the image display body on its front side. When the image display body of such a transfer foil is transferred from the support onto the base material, the surface of the base material is compared with the case where each of the first and second relief structures is directly formed on the base material. The effect of the unevenness on the image quality can be reduced.

  The labeled article according to the thirteenth aspect of the present invention includes the image display body according to any one of the first to eleventh aspects and a base material that supports the image display body. This labeled article is difficult to counterfeit in addition to displaying images showing complex visual effects with high image quality.

  The labeled article according to the fourteenth aspect of the present invention is the labeled article according to the thirteenth aspect used for personal authentication. This labeled article is difficult to tamper with in addition to displaying an image showing a complex visual effect with high image quality.

The top view which shows roughly the labeled article which concerns on 1 aspect of this invention. The top view which expands and shows an example of the structure employable for the labeled article shown in FIG. Sectional drawing along the III-III line of the structure shown in FIG. The top view which shows roughly the diffraction structure which the image display body of the labeled article shown in FIG.2 and FIG.3 contains. The top view which shows schematically the other diffraction structure which the image display body of the labeled article shown in FIG.2 and FIG.3 contains. Sectional drawing which shows roughly an example of the transfer foil which can be utilized for formation of a 1st display element in manufacture of the labeled article which employ | adopted the structure shown in FIG.2 and FIG.3. Sectional drawing which shows roughly an example of the transfer foil which can be utilized for formation of a 2nd display element in manufacture of the labeled article which employ | adopted the structure shown in FIG.2 and FIG.3. The top view which expands and shows the other example of the structure employable for the labeled article shown in FIG. Sectional drawing along the IX-IX line of the structure shown in FIG. Sectional drawing which shows roughly an example of the secondary transfer foil which can be utilized for manufacture of the labeled article which employ | adopted the structure shown in FIG.8 and FIG.9. The top view which expands and shows further another example of the structure employable for the labeled article shown in FIG. Sectional drawing along the XII-XII line of the structure shown in FIG.

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

FIG. 1 is a plan view schematically showing a labeled article according to an aspect of the present invention.
The labeled article 100 shown in FIG. 1 is a booklet such as a passport. FIG. 1 shows the booklet in an open state.

The labeled article 100 includes a signature 1 and a cover 2.
The signature 1 is composed of one or more pieces of paper 11. Typically, a print pattern 12 such as a character string and a background pattern is provided on the paper piece 11. The signature 1 is formed by folding one paper piece 11 or a bundle of a plurality of paper pieces 11 into two. The paper piece 11 may include an IC (integrated circuit) chip in which personal information is recorded, an antenna that enables non-contact communication with the IC chip, and the like.

  The cover 2 is folded in half. The cover 2 and the signature 1 are overlapped so that the signature 1 is sandwiched by the cover 2 with the booklet closed, and are integrated by binding or the like at the positions of the folds.

  The cover 2 displays an image including personal information. This personal information includes personal authentication information used for personal authentication. This personal information can be classified into, for example, biological information and non-biological personal information.

  The biological information is unique to the individual among the characteristics of the biological body. Typically, biometric information is a feature that can be identified by optical techniques. For example, the biometric information is at least one image or pattern of a face, fingerprint, vein, and iris.

  Non-biological personal information is personal information other than biological information. For example, the non-biological personal information is at least one of name, date of birth, age, blood type, gender, nationality, address, permanent address, telephone number, affiliation, and status. The non-biological personal information may include characters input by typing, may include characters input by machine reading a handwriting such as a signature, or may include both of them. .

In FIG. 1, the cover 2 displays images I1a, I1b, I2 and I3.
The images I1a, I2 and I3 are images displayed using light absorption. Specifically, the images I1a, I2, and I3 are images that are visible when illuminated with white light and observed with the naked eye. One or more of the images I1a, I2 and I3 may be omitted.

  The images I1a, I2 and I3 can be composed of, for example, dyes and pigments. In this case, the images I1a, I2 and I3 can be formed by a thermal transfer recording method using a thermal head, an ink jet recording method, an electrophotographic method, or a combination of two or more thereof. Alternatively, the images I1a, I2 and I3 can be formed by forming a layer containing a thermal color former and drawing on this layer with a laser beam. Alternatively, a combination of these methods can be used. At least a part of the images I2 and I3 may be formed by a thermal transfer recording method using a hot stamp, may be formed by a printing method, or may be formed using a combination thereof.

  The image I1b is an image displayed by a diffraction structure such as a diffraction grating and a hologram, for example. As will be described in detail later, the image I1b is formed, for example, by performing thermal transfer recording using a thermal head and thermal transfer recording using a hot stamp or a heat roll in this order.

  The images I1a and I1b include face images of the same person. The face image included in the image I1a and the face image included in the image I1b may be the same or different. The face image included in the image I1a and the face image included in the image I1b may have the same or different dimensions. Each of the images I1a and I1b may include other biological information instead of the face image, and may further include biological information other than the face image in addition to the face image.

  The image 11b may include non-biological personal information instead of the biological information, and may further include non-biological personal information in addition to the biological information. In addition, the image 11b may include non-personal information instead of personal information, and may further include non-personal information in addition to the personal information.

  The image I2 includes non-biological personal information and non-personal information. The image I2 forms, for example, one or more of characters, symbols, codes, and marks.

  The image I3 is a background pattern. For example, when the image I3 and at least one of the images 11a and 11b are combined, it is possible to make it more difficult to tamper with the labeled article 100.

Next, the structure of the cover 2 will be described with reference to FIGS.
FIG. 2 is an enlarged plan view showing an example of a structure that can be employed in the labeled article shown in FIG. 3 is a cross-sectional view taken along line III-III of the structure shown in FIG. FIG. 4 is a plan view schematically showing a diffractive structure included in the image display body of the labeled article shown in FIGS. 2 and 3. FIG. 5 is a plan view schematically showing another diffractive structure included in the image display body of the labeled article shown in FIGS. 2 and 3.

  The X direction is a direction parallel to the display surface of the image display body, the Y direction is a direction parallel to the display surface of the image display body and a direction perpendicular to the X direction, and the Z direction is X and X. This is a direction perpendicular to the Y direction. Also, the structure shown in FIGS. 2 and 3 is a portion of the cover 2 corresponding to the image I1b.

As shown in FIG. 3, the cover 2 includes a cover main body 21 and an image display body 22.
The cover main body 21 is a base material of the labeled article 100 and is typically a piece of paper. The cover main body 21 may have a single layer structure or a multilayer structure. The cover body 21 is folded in half so as to sandwich the signature 1 in a state where the labeled article 100 is closed.

  The image display body 22 is a layer having a multilayer structure. The image display 22 is affixed to the main surface of the cover body 21 that faces the signature 1 when the labeled article 100 is closed.

  The image display body 22 includes an image display layer (not shown) that displays at least a part of the images I1a, I2 and I3. The image displayed by the image display layer typically includes an image I1a.

  The image display layer displays at least a part of the images I1a, I2 and I3 using light absorption. The image display layer has a pattern shape corresponding to at least a part of the images I1a, I2 and I3. This image display layer can be composed of at least one of a dye and a pigment and an arbitrary resin. Such an image display layer can be obtained, for example, by using a thermal transfer recording method using a thermal head, an ink jet recording method, an electrophotographic method, or a combination of two or more thereof. Further, at least a part of the image display layer may be formed by a thermal transfer recording method using a hot stamp, may be formed by a printing method, or may be formed by using a combination thereof.

  This image display layer may not be patterned. That is, the image display layer may be a continuous film. In this case, the image display layer can be obtained, for example, by forming a layer containing a heat-sensitive color former and drawing on this layer with a laser beam.

  This image display layer can be omitted. For example, the image display layer may be provided on the cover body 21 without being a component of the image display body 22.

  As shown in FIG. 3, the image display body 22 further includes a first display element 220 a, a second display element 220 b, a resin layer 225, and a protective layer 227. In FIG. 2, a broken line represents a boundary between a plurality of pixels arranged two-dimensionally.

  The first display elements 220a are arranged corresponding to a part of the pixels. That is, at least one pixel includes the display element 220a. Here, as an example, it is assumed that a plurality of pixels include the display element 220a, that is, the arrangement of the display elements 220a forms a pattern.

  The display element 220a has visible light transparency. The arrangement of the display elements 220a displays the first image as a structural color image, here a diffraction image, when observed from the first direction under a specific illumination condition. The arrangement of the display elements 220a is such that the first image is not displayed as a diffraction image when viewed from a second direction different from the first direction under the previous illumination conditions, or the first image is not displayed as the first image. It is displayed as a darker diffraction image than when observed from one direction. Here, it is assumed that the first image displayed as the diffraction image by the arrangement of the display elements 220a is the right-eye parallax image of the image I1b.

  The display element 220a includes a first light transmission layer 223a, a first reflection layer 224a, a first resin layer 225a, and a first protective layer 227a.

  The light transmission layer 223a has a light transmission property, specifically a visible light transmission property, and is typically a transparent layer. On one main surface of the light transmission layer 223a, a diffractive structure is provided as a first relief structure. This diffractive structure is, for example, a diffraction grating and / or a hologram, and includes a plurality of grooves Ga provided on one main surface of the light transmission layer 223a as shown in FIG. The grooves Ga have the same shape and are arranged in parallel with each other at a constant pitch. The length direction of the groove Ga is inclined counterclockwise with respect to the X direction. In the example shown in FIG. 4, the groove Ga is curved in an arc shape, but the groove Ga may not be curved.

  Examples of the material of the light transmitting layer 223a include thermoplastic resins such as polyurethane resin, polycarbonate resin, polystyrene resin and polyvinyl chloride resin, unsaturated polyester resin, melamine resin, epoxy resin, urethane acrylate, urethane methacrylate, polyol acrylate, Thermosetting resins such as polyol methacrylate, melamine acrylate, melamine methacrylate, triazine acrylate and triazine methacrylate, mixtures thereof, or thermoformable materials having radically polymerizable unsaturated groups can be used. The light transmission layer 223a may be formed using a resin having photocurability. Note that the light transmission layer 223a obtained using such a transparent resin typically has a refractive index in the range of 1.3 to 1.7 with respect to light having a wavelength of 550 nm.

  The reflective layer 224a is interposed between the cover body 21 and the light transmission layer 223a. The reflection layer 224a is formed on the light transmission layer 223a. The reflection layer 224a covers at least part of the surface of the light transmission layer 223a where the relief structure is provided.

  The reflective layer 224a has visible light permeability. As the reflective layer 224a, for example, a transparent reflective layer can be used. Such a reflective layer 224a can be formed by, for example, a vacuum film forming method such as vacuum deposition or sputtering. When the reflective layer 224a contains a resin, the reflective layer 224a may be formed by applying or printing.

  When a transparent reflective layer is used as the reflective layer 224a, even if a pattern such as a pattern and characters is arranged on the back side of the reflective layer 224a, it can be visually recognized from the front side of the image display body 22.

  The transparent reflective layer may have a single layer structure or a multilayer structure. In the latter case, the transparent reflective layer may be designed so as to repeatedly cause reflection interference. As a material of the transparent reflective layer, for example, a transparent dielectric such as zinc sulfide and titanium dioxide can be used.

  The transparent reflection layer having a single layer structure made of a transparent dielectric has a refractive index different from that of the light transmission layer 223a. Typically, a transparent reflective layer having a single layer structure made of a transparent dielectric has a higher refractive index for light having a wavelength of 550 nm than that of the light transmitting layer 223a.

  The transparent reflection layer having a multilayer structure made of a transparent dielectric has a refractive index different from that of the light transmission layer 223a at a portion in contact with the light transmission layer 223a. A transparent reflective layer having a multilayer structure made of a transparent dielectric typically has a refractive index with respect to light having the above-mentioned wavelength of a layer closest to the light transmitting layer 223a, and a refractive index with respect to light having this wavelength of the light transmitting layer 223a. Bigger compared.

  A metal layer may be used as the transparent reflective layer. As a material for the metal layer, for example, a single metal such as aluminum, tin, copper, silver, gold, iron, chromium, titanium, nickel and copper, or an alloy thereof can be used. The metal layer is light-shielding when it is thick, but becomes transparent when it is thin. In general, a metal layer having a thickness of less than 20 nm is transparent. In the case of an aluminum layer having a thickness in the range of 20 to 40 nm, the metallic luster can be observed under certain observation conditions, but the background can be seen through when the observation angle is changed.

  A thicker metal layer can also be used as the transparent reflective layer. For example, a relatively thick metal layer is formed, and a large number of openings having a diameter or width that are difficult to identify with the naked eye are provided. For example, this metal layer is patterned into a halftone dot or a line. Thereby, a transparent reflective layer made of a metal material can be obtained.

  As the transparent reflection layer, a layer containing a transparent resin and particles dispersed therein may be used. As the particles, for example, particles made of a metal material such as a single metal and an alloy, or particles made of a transparent dielectric such as a transparent metal oxide and a transparent resin can be used. In the transparent resin, flakes may be dispersed instead of dispersing the particles.

  The resin layer 225a is interposed between the cover body 21 and the reflective layer 224a. The resin layer 225a plays a role of bonding the display element 220a to the cover body 21. The resin layer 225a can be omitted.

  The resin layer 225a is made of, for example, a thermoplastic resin. Examples of the material of the resin layer 225a include urethane resin, butyral resin, polyester resin, polyvinyl chloride resin such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer, polyurethane resin, epoxy resin, chlorinated polypropylene, and acrylic resin. , Polystyrene, polyvinylbenzene, styrene-butadiene copolymer resin, vinyl resins such as polyvinyl resins obtained from styrene and alkyl methacrylate (wherein the alkyl group has 2 to 6 carbon atoms), rubber-based materials, or these Mixtures containing two or more can be used.

  The resin layer 225a is made of wax, higher fatty acids such as stearic acid, metal salts and esters thereof, plasticizers, organic fillers made of organic materials such as polytetrafluoroethylene, polyethylene, silicone resins and polyacrylonitrile, and silica. One or more inorganic fillers made of an inorganic material may be added.

  The protective layer 227a covers the back surface of the surface provided with the relief structure of the light transmission layer 223a. The protective layer 227a can be omitted.

  The protective layer 227a is made of, for example, a resin such as a thermoplastic resin, a thermosetting resin, and an ultraviolet ray or an electron beam curable resin. When the pattern of the display element 220a is formed using the transfer foil, it is preferable to use a thermoplastic resin from the viewpoints of flexibility and foil breakability.

  Examples of this thermoplastic resin include polyacrylate resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, cellulose resin, chlorinated polypropylene resin, epoxy resin, polyester resin, nitrocellulose resin, A thylene acrylate resin, a polyether resin, a polycarbonate resin, or a mixture thereof can be used. In consideration of foil cutting properties and abrasion resistance, this resin includes waxes such as petroleum waxes and plant waxes, higher fatty acids such as stearic acid, metal salts thereof, esters and silicone oils and other lubricants, polytetrafluoroethylene One or more of an organic filler made of an organic material such as polyethylene, silicone resin and polyacrylonitrile, and an inorganic filler made of an inorganic material such as silica may be added.

  The diameter or the minimum center-to-center distance of the display element 220a is, for example, in the range of 0.042 to 0.508 mm (about 600 to about 50 dots per inch). When a face image is displayed on the array of the display elements 220a, the diameter or the minimum center distance of the display elements 220a is, for example, in the range of 0.042 to 0.169 mm (about 600 to about 150 dots per inch). . When this dimension is increased, it becomes difficult to display a high-definition image on the array of the display elements 220a. When this dimension is reduced, the reproducibility of the pattern shape of the display element 220a is lowered.

  The second display elements 220b are arranged corresponding to a part of the pixels. That is, at least one pixel includes the display element 220b. Here, as an example, it is assumed that a plurality of pixels include the display element 220b, that is, the arrangement of the display elements 220b forms a pattern.

  Further, the pixel including the display element 220b and the pixel including the display element 220a partially overlap. Here, as an example, some pixels include the display element 220a and do not include the display element 220b, and some other pixels include the display element 220b and do not include the display element 220a. Some pixels include display elements 220a and 220b, and the remaining pixels do not include display elements 220a and 220b.

  In the pixel including the display elements 220a and 220b, the display element 220b faces the display element 220a. In the pixel including the display elements 220a and 220b, the display element 220a is interposed between the display element 220b and the cover body 21.

  The display element 220b has visible light transparency. The arrangement of the display elements 220b displays the second image as a structural color image, here a diffraction image, when observed from the second direction under a specific illumination condition. The arrangement of the display elements 220b is such that when the second image is not displayed as a diffraction image when viewed from the first direction under the previous illumination conditions, or when the second image is observed from the second direction. And a darker diffraction image. Here, it is assumed that the second image displayed as the diffraction image by the arrangement of the display elements 220b is the left-eye parallax image of the image I1b.

  The right-eye parallax image and the left-eye parallax image are, for example, images obtained by simultaneously photographing the same subject from different positions. The observer perceives a stereoscopic image by observing the parallax image for the right eye and the parallax image for the left eye with the right eye and the left eye, respectively.

  The display element 220b includes a second light transmission layer 223b, a second reflection layer 224b, a second resin layer 225b, and a second protective layer 227b.

  The light transmission layer 223b has visible light transmission, specifically visible light transmission, and is typically a transparent layer. On one main surface of the light transmission layer 223b, a diffractive structure is provided as a second relief structure. In each pixel including the display elements 220a and 220b, the region where the second relief structure is provided on the main surface of the light transmission layer 223b is provided with the first relief structure on the main surface of the light transmission layer 223a. The area is smaller than that of the area.

  The diffractive structure provided on one main surface of the light transmission layer 223b is, for example, a diffraction grating and / or a hologram, and a plurality of diffraction structures provided on one main surface of the light transmission layer 223b as illustrated in FIG. It consists of a groove Gb. The grooves Gb have the same shape and are arranged in parallel with each other at a constant pitch. The length direction of the groove Gb is inclined clockwise with respect to the X direction. In the example shown in FIG. 5, the groove Gb is curved in an arc shape, but the groove Gb may not be curved. As a material of the light transmission layer 223a, for example, the materials described above for the light transmission layer 223a can be used.

  The reflective layer 224b is interposed between the cover body 21 and the light transmission layer 223b. The reflection layer 224b is formed on the light transmission layer 223b. The reflection layer 224b covers at least part of the surface of the light transmission layer 223b where the relief structure is provided.

  The reflective layer 224b has visible light permeability. As the reflective layer 224b, for example, the transparent reflective layer described above for the reflective layer 224a can be used.

  The resin layer 225b is interposed between the cover body 21 and the reflective layer 224b. As a material of the resin layer 225b, for example, those described above for the resin layer 225a can be used. The resin layer 225b can be omitted.

  The protective layer 227b covers the back surface of the surface provided with the relief structure of the light transmission layer 223b. As a material of the protective layer 227b, for example, those described above for the protective layer 227a can be used. The protective layer 227b can be omitted.

  The resin layer 225 covers the cover body 21 and the display elements 220a and 220b. The resin layer 225 has visible light permeability and is typically transparent. The resin layer 225 is made of, for example, a thermoplastic resin. The resin layer 225 can be omitted.

  The protective layer 227 is provided on the resin layer 225. The protective layer 227 has visible light transparency and is typically transparent. The protective layer 227 is made of a resin such as acrylic, polyethylene, or polyester. The protective layer 227 can be omitted.

  The diameter or minimum center-to-center distance of the display element 220b is, for example, in the range of 0.042 to 0.508 mm (about 600 to about 50 dots per inch). When a face image is displayed in the array of the display elements 220b, the diameter or the minimum center distance of the display elements 220b is within a range of, for example, 0.042 to 0.169 mm (about 600 to about 150 dots per inch). . When this dimension is increased, it becomes difficult to display a high-definition image on the array of the display elements 220b. When this dimension is reduced, the reproducibility of the pattern shape of the display element 220b is lowered.

  As described above, the image display body 22 displays a stereoscopic image as the image I1b using diffracted light. That is, this image display body 22 shows a complicated visual effect.

  In addition, when the first and second relief structures are provided on the same plane, in order to display both the first and second images in the same region, each pixel is divided into a sub-pixel for the first relief structure and a second pixel. It must be divided into sub-pixels for the relief structure. In this case, to achieve high resolution, the first and second sub-pixels must be significantly reduced. Such an image display is particularly difficult to manufacture in a process of recording an image on demand. Therefore, it is difficult to achieve high resolution.

  On the other hand, in the image display body 22 described above, the display elements 220a and 220b are arranged so that the first and second relief structures face each other in pixels including both the display elements 220a and 220b. When this configuration is adopted, it is not necessary to arrange the first and second sub-pixels alternately. Accordingly, the above-described problem does not occur, and high resolution can be achieved relatively easily. That is, an image can be displayed with high image quality.

  Further, in the image display body 22, in the pixel including both the display elements 220a and 220b, the display element 220b is located on the front side of the display element 220a. Therefore, in such a pixel, if the area S1 of the region provided with the first relief structure is equal to the area S2 of the region provided with the second relief structure, it is caused by light absorption or the like by the display element 220b. The first image may be displayed darker than the second image.

  In the image display body 22, in a pixel including both the display elements 220a and 220b, the area S2 of the region provided with the second relief structure is compared with the area S1 of the region provided with the first relief structure. Smaller than. The ratio S2 / S1 between the area S2 and the area S1 is, for example, in the range of 0.5 to 0.9, and typically in the range of 0.7 to 0.8. By appropriately setting the ratio S2 / S1, it is possible to control the brightness of the first and second images, for example, to display parallax images having substantially the same brightness on the display elements 220a and 220b.

  That is, the image display body 22 can display an image showing a complicated visual effect with high image quality.

  The image display 22 displays a structural color image I1b. Such an image display 22 is difficult to counterfeit, and it is also difficult to falsify recorded information.

  Therefore, the labeled article 100 including the image display body 22 is difficult to display counterfeits and falsification of information in addition to displaying an image showing a complicated visual effect with high image quality.

Next, a manufacturing method of the labeled article 100 will be described with reference to FIGS.
FIG. 6 is a cross-sectional view schematically showing an example of a transfer foil that can be used for forming the first display element in the manufacture of a labeled article employing the structure shown in FIGS. 2 and 3.

  A transfer foil 201a shown in FIG. 6 is, for example, a transfer ribbon. The transfer foil 201a includes a support 226a and a transfer material layer 220a 'that is detachably supported by the support 226a.

  The support body 226a is, for example, a resin film or a sheet. The support 226a is made of a material having excellent heat resistance such as polyethylene terephthalate. On the main surface supporting the transfer material layer 220a 'of the support 226a, a release layer containing, for example, a fluororesin or a silicone resin may be provided.

  The transfer material layer 220a 'includes a peeling protection layer 227a', a light transmission layer 223a ', a reflection layer 224a', and a resin layer 225a '.

  The peeling protection layer 227a 'serves to stabilize peeling of the transfer material layer 220a' from the support 226a and to protect the light transmission layer 223a and the reflection layer 224a of the display element 220a from damage. Part or all of the peeling protective layer 227a 'is used as the protective layer 227a shown in FIG. In the case where the resin layer 225a 'has a function of a peeling layer, the peeling protective layer 227a' can be omitted.

  The light transmission layer 223a 'is formed on the peeling protection layer 227a'. A relief structure used as the first relief structure is provided on the surface of the light transmission layer 223a '. A part or all of the light transmission layer 223a 'is used as the light transmission layer 223a shown in FIG.

  The reflection layer 224a 'is formed on the light transmission layer 223a'. The light transmission layer 223a 'forms a relief structure on the main surface of the reflection layer 224a' on the light transmission layer 223a 'side. Part or all of the reflective layer 224a 'is used as the reflective layer 224a shown in FIG.

  The resin layer 225a 'is provided on the reflective layer 224a'. The resin layer 225a 'plays a role as an adhesive. Part or all of the resin layer 225a 'is used as the resin layer 225a shown in FIG. The resin layer 225a 'can be omitted.

  FIG. 7 is a cross-sectional view schematically showing an example of a transfer foil that can be used to form a second display element in the manufacture of a labeled article that employs the structure shown in FIGS. 2 and 3.

  A transfer foil 201b shown in FIG. 7 is, for example, a transfer ribbon. The transfer foil 201b includes a support 226b and a transfer material layer 220b 'that is detachably supported by the support 226b.

  The support body 226b is, for example, a resin film or a sheet. The support 226b is made of a material having excellent heat resistance such as polyethylene terephthalate. A release layer containing, for example, a fluororesin or a silicone resin may be provided on the main surface of the support 226b that supports the transfer material layer 220b '.

  The transfer material layer 220b 'includes a peeling protection layer 227b', a light transmission layer 223b ', a reflection layer 224b', and a resin layer 225b '.

  The peeling protective layer 227b 'serves to stabilize peeling of the transfer material layer 220b' from the support 226b and to protect the light transmission layer 223b and the reflective layer 224b of the display element 220b from damage. Typically, a part of the peeling protective layer 227b 'is used as the protective layer 227b shown in FIG. In the case where the resin layer 225b 'has a function of a release layer, the release protective layer 227b' can be omitted.

  The light transmission layer 223b 'is formed on the peeling protection layer 227b'. A relief structure used as a first relief structure is provided on the surface of the light transmission layer 223b '. Typically, a part of the light transmission layer 223b 'is used as the light transmission layer 223b shown in FIG.

  The reflection layer 224b 'is formed on the light transmission layer 223b'. The light transmission layer 223b 'forms a relief structure on the main surface of the reflection layer 224b' on the light transmission layer 223b 'side. Typically, a part of the reflective layer 224b 'is used as the reflective layer 224b shown in FIG.

  The resin layer 225b 'is provided on the reflective layer 224b'. The resin layer 225b 'plays a role as an adhesive. Typically, a part of the resin layer 225b 'is used as the resin layer 225b shown in FIG. The resin layer 225b 'can be omitted.

  The manufacture of the labeled article 100 using the transfer foils 201a and 201b is performed by the following method, for example.

  First, a booklet similar to the labeled article 100 described with reference to FIGS. 1 to 3 is prepared except that the image display body 22 is omitted.

  Next, an image display layer for displaying the images I1a, I2 and I3 is formed on the cover body 21 of the booklet.

  Next, a part of the transfer material layer 220a ′ is transferred from the support 226a of the transfer foil 201a onto the cover body 21 of the booklet by thermal transfer using a thermal head, and an array of display elements 220a is formed. Form. Subsequently, a part of the transfer material layer 220b ′ is transferred from the support 226b of the transfer foil 201b onto the cover body 21 of the booklet by thermal transfer using a thermal head, and the array of display elements 220b is formed. Form.

  Thereafter, the cover body 21 and the protective layer 227 are bonded with the light transmission layer 225 interposed therebetween so that the light transmission layer 22 covers the display elements 220a and 220b.

  As described above, the labeled article 100 described with reference to FIGS. 1 to 5 is completed.

  Here, after the image display layer for displaying the images I1a, I2 and I3 is formed, the transfer using the transfer foils 201a and 201b is performed. However, these transfers display the images I1a, I2 and I3. You may carry out before forming an image display layer. Here, the image display layer for displaying the images I1a, I2 and I3 is formed on the cover body 21 of the booklet, but this image display layer is formed on the surface of the protective layer 227 on the light transmission layer 225 side. It may be formed.

Various modifications can be made to the image display body 22 and the labeled article 100 described above.
FIG. 8 is an enlarged plan view showing another example of a structure that can be employed in the labeled article shown in FIG. FIG. 9 is a cross-sectional view taken along line IX-IX of the structure shown in FIG.

  The structure shown in FIGS. 8 and 9 is the same as the structure described with reference to FIGS. 2 and 3 except for the following points.

  That is, in the structure shown in FIGS. 8 and 9, each of the display elements 220a and 220b is upside down from the structure shown in FIGS. In the structure shown in FIGS. 8 and 9, the display elements 220a and 220b have the same dimensions. The first relief structure extends over the entire display element 220a when viewed from the Z direction in any of the structures shown in FIGS. 8 and 9 and the structures shown in FIGS. On the other hand, in the structure shown in FIGS. 2 and 3, the second relief structure extends over the entire display element 220b when viewed from the Z direction, whereas in the structure shown in FIGS. When viewed from the Z direction, it extends only to a part of the display element 220b.

  8 and 9 includes resin layers 2251 and 2252 instead of the resin layer 225. The structure shown in FIG. As a material of the resin layers 2251 and 2252, for example, those described above for the resin layer 225 can be used. The material of the resin layer 2251 and the material of the resin layer 2252 may be the same or different.

  The structure shown in FIGS. 8 and 9 further includes a specular reflection layer 224 between the resin layers 2251 and 2252. The specular reflection layer 224 is made of, for example, a single metal or an alloy. The specular reflection layer 224 has a higher visible light reflectance than the reflection layers 224a and 224b. Typically, the specular reflection layer 224 is light-shielding. As a material of the specular reflection layer 224, for example, a single metal such as aluminum, tin, copper, silver, gold, iron, chromium, titanium, nickel and copper, or an alloy thereof can be used.

  8 and 9 further includes a brightness adjustment element 220c. In each pixel including the display element 220a and not including the display element 220b, the luminance adjustment element 220c is disposed so as to face the specular reflection layer 224 with the display element 220a interposed therebetween.

  The brightness adjustment element 220c has visible light transparency and does not display a structural color. Typically, the brightness adjustment element 220c has substantially the same visible light transmittance as the display element 220b. For example, the luminance adjustment element 220c looks almost the same color as the display element 220b under the condition that the structural color of the display element 220b cannot be observed.

  The brightness adjustment element 220c can have various structures. In the example shown in FIGS. 8 and 9, the brightness adjustment element 220c has the same structure as the display element 220b except that the relief structure is not provided.

  That is, the brightness adjustment layer 220c includes a light transmission layer 223c, a reflection layer 224c, a resin layer 225c, and a protective layer 227c.

  The light transmission layer 223c is the same as the light transmission layer 223b except that a relief structure exhibiting a structural color is not provided. Typically, both main surfaces of the light transmission layer 223c are flat.

  The reflection layer 224c is formed on one main surface of the light transmission layer 223c. Here, the reflective layer 224c faces the display element 220a with the light transmission layer 223c interposed therebetween. The reflective layer 224c is substantially the same as the reflective layer 224b except that the relief structure derived from the light transmission layer 223c is not provided. Typically, the thickness of the reflective layer 224c is set so that the transmittance thereof is substantially equal to the transmittance of the reflective layer 224b.

  The resin layer 225c is provided on the reflective layer 224c. The resin layer 225c is interposed between the reflective layer 224c and the protective layer 227. The resin layer 225c is substantially the same as the resin layer 225b.

  The protective layer 227c faces the reflective layer 224c with the light transmission layer 223c interposed therebetween. The protective layer 227c is substantially the same as the protective layer 227b.

  When the luminance adjustment layer 220c is omitted, the structural color image displayed by the arrangement of the display elements 220a has a luminance variation corresponding to the arrangement of the display elements 220b due to light reflection and absorption by the display elements 220b. Can occur. On the other hand, when the structure shown in FIGS. 8 and 9 is adopted, such variation in luminance can be suppressed.

  Further, the structure shown in FIGS. 8 and 9 includes a specular reflection layer 224. Therefore, the reflected light from the specular reflection layer 224 can also be used for display. That is, the structural color can be displayed brighter.

Next, a manufacturing method of the labeled article 100 employing the structure shown in FIGS. 8 and 9 will be described with reference to FIG.
FIG. 10 is a cross-sectional view schematically showing an example of a secondary transfer foil that can be used for manufacturing a labeled article employing the structure shown in FIGS. 8 and 9.

  The secondary transfer foil 202 is, for example, a transfer ribbon. The secondary transfer foil 202 includes a support 226 and a transfer material layer 22 ′ that is releasably supported by the support 226.

  The support body 226 is a resin film or a sheet, for example. The support 226 is made of a material having excellent heat resistance such as polyethylene terephthalate. On the main surface supporting the transfer material layer 22 ′ of the support 226, a release layer containing, for example, a fluororesin or a silicone resin may be provided.

  The transfer material layer 22 ′ includes a peeling protection layer 227 ′, display elements 220 a and 220 b, a luminance adjustment element 220 c, resin layers 2251 ′ and 2251 ′, and a specular reflection layer 224 ′.

  The release protective layer 227 ′ is formed on the support 226. The peeling protection layer 227 'serves to stabilize peeling of the transfer material layer 22' from the support 226 and to protect the display elements 220a and 220b from damage. A part or all of the peeling protective layer 227 'is used as the protective layer 227 shown in FIG.

  The display elements 220a and 220b and the brightness adjusting element 220c are formed on the peeling protective layer 227 '. The display elements 220a and 220b and the brightness adjusting element 220c can be formed by thermal transfer using a thermal head. Specifically, the display element 220a can be formed using, for example, the transfer foil 201a described with reference to FIG. Further, the display element 220b is described with reference to FIG. 6 except that, for example, the relief structure is provided in an island shape corresponding to the pixel instead of being provided on the entire main surface of the light transmission layer 223b ′. The transfer foil 201b can be formed using the same transfer foil. The brightness adjusting element 220c can be formed using, for example, a transfer foil similar to the transfer foil 201b described with reference to FIG. 6 except that the relief structure is omitted.

  The resin layer 2251 ′ is provided on the release protective layer 227 ′. The resin layer 2251 'covers the display elements 220a and 220b and the luminance adjustment element 220c. The resin layer 2251 ′ provides sufficient strength to the transfer material layer 22 ′ and provides a substantially flat base for the specular reflection layer 224 ′. Part or all of the resin layer 2251 'is used as the resin layer 2251 shown in FIG. The resin layer 2251 ′ is formed, for example, by applying a resin on the peeling protection layer 227 ′. Alternatively, the resin layer 2251 ′ can be obtained by extruding a molten resin into a film shape on the peeling protection layer 227 ′. Alternatively, the resin layer 2251 ′ can be obtained by pressure-bonding the thermoplastic resin layer on the release protective layer 227 ′ while heating.

  The specular reflection layer 224 'is provided on the resin layer 2251'. A part or all of the specular reflection layer 224 'is used as the reflection layer 224 shown in FIG. The specular reflection layer 224 'is obtained, for example, by bonding a metal foil to the resin layer 2251'. Alternatively, the laminate of the thermoplastic resin layer and the metal foil is bonded by heating while pressing the resin layer 2251 so that the metal foil faces the release protective layer 227 ′ with the thermoplastic resin layer interposed therebetween. 'And the specular reflection layer 224' are obtained at the same time.

  The resin layer 2251 ′ is provided on the specular reflection layer 224 ′. Part or all of the resin layer 2251 'is used as the resin layer 2251 shown in FIG. The resin layer 2251 ′ is formed, for example, by applying a resin on the specular reflection layer 224 ′. Alternatively, the resin layer 2251 ′ is obtained by extruding a molten resin into a film shape on the specular reflection layer 224 ′. Alternatively, the resin layer 2251 ′ is obtained by pressing a thermoplastic resin layer on the specular reflection layer 224 ′ while heating.

  At least one of the images I1a, I2 and I3 shown in FIG. 1 is displayed between or on the resin layer 2251 ′ and the specular reflection layer 224 ′ or between the peeling protection layer 227 ′ and the resin layer 2251 ′. An image display layer (not shown) can be further formed. When such an image display layer is formed by a thermal transfer method, a sublimation transfer method may be employed, a melt transfer method may be employed, or both of them may be employed. The images I1a and I2 may be monochrome images or color images. In the latter case, the image display layer that displays the images I1a and I2 is formed, for example, by using one or more ink ribbons to form, for example, four colored layers of yellow, magenta, cyan, and black, or It is obtained by forming colored layers of three colors of red, green and blue.

  When manufacturing the labeled article 100 adopting the structure shown in FIGS. 8 and 9, first, the secondary transfer foil 202 and the image display body 22 described above are omitted with reference to FIGS. A booklet similar to the labeled article 100 described is prepared.

  Next, a portion of the transfer material layer 22 ′ formed on the support 226 to be used as the image display body 22 is thermally transferred from the support 226 onto the cover body 21 shown in FIG. 9. For this thermal transfer, for example, a hot stamp is used. Instead of thermal transfer using a hot stamp, thermal transfer using a thermal roll or a thermal head may be performed. The image display body 22 is pasted on the cover body 21 as described above.

  As described above, the labeled article 100 employing the structure shown in FIGS. 8 and 9 is completed.

  In this method, the display elements 220a and 220b are formed by thermal transfer using a thermal head. The fineness that can be achieved when using a thermal head is higher than the fineness that can be achieved when printing pearl pigments.

  In addition, when the display elements 220a and 220b are directly formed on the cover body 21 by thermal transfer using a thermal head, it may be difficult to achieve high image quality due to the surface roughness of the cover body 21 and the like. On the other hand, in the method described above, the display elements 220a and 220b are not formed directly on the cover body 21. That is, in this method, first, it is formed on the peeling protection layer 227 ′, and then transferred onto the cover body 21 together with the peeling protection layer 227 ′. Therefore, the surface roughness of the cover body 21 does not have a great influence on the image quality.

  Therefore, according to this method, it is possible to display images with excellent image quality on the display elements 220a and 220b.

  The image display 22 displays a part of personal information using a hologram and / or a diffraction grating. It is extremely difficult to tamper with personal information displayed by the hologram and / or diffraction grating, particularly biological information.

In this method, the image display body 22 is supported on the cover body 21 by thermal transfer. Such an image display body 22 is easily destroyed when it is peeled off from the cover body 21.
Therefore, the labeled article 100 is difficult to tamper with.

  Here, a configuration is employed in which a parallax image for the right eye is displayed in the array of display elements 220a and a parallax image for the left eye is displayed in the array of display elements 220b. However, the arrangement for the left eye is displayed in the array of display elements 220a. A configuration may be employed in which a parallax image is displayed and a parallax image for the right eye is displayed in the array of the display elements 220b. In addition, here, the arrangement in which the arrangement of the display elements 220a and the arrangement of the display elements 220b is provided to display two parallax images is adopted, but another arrangement of other display elements is provided to provide three or more different ones. A parallax image may be displayed. That is, a configuration may be adopted in which the appearance of the stereoscopic image changes as if the subject is actually observed by changing the observation angle.

  Instead of displaying monochrome images on the array of display elements 220a and the array of display elements 220b, color images may be displayed on them. For example, each of the array of display elements 220a and the array of display elements 220b may be composed of three display elements whose display colors are red, green, and blue.

  As described above, the labeled article 100 as a passport is exemplified, but the technique described above for the labeled article 100 can also be applied to other personal authentication media. For example, this technology can be applied to various cards such as a visa and an ID card. The technique described above for the labeled article 100 may be applied to an article other than the personal authentication medium. For example, the above-described technique may be applied to articles such as arts and crafts.

  Further, although the image display body 22 and the intermediate transfer medium 202 for security use such as forgery prevention are illustrated, the techniques described above for the image display body 22 and the intermediate transfer medium 202 may be applied to uses other than forgery prevention. For example, the technology described above may be applied to uses such as learning materials and toys.

  The material of the base material to which the image display body 22 is attached may be other than paper. For example, the base material to which the image display body 22 is attached may be a plastic substrate, a metal substrate, a ceramic substrate, or a glass substrate.

  The images to be displayed on the display elements 220a and 220b may include other biological information in addition to the face image, or may include other biological information instead of the face image. The images displayed on the display elements 220a and 220b may include at least one of non-biological personal information and non-personal information in addition to biometric information. At least one of them may be included.

  Instead of displaying stereoscopic images on the display elements 220a and 220b, different planar images may be displayed on them. In other words, the previous image display 22 may employ a configuration in which the display image is switched according to the observation angle.

  The display elements 220a and 220b may be provided with a relief structure other than the diffraction grating and the hologram. For example, the display elements 220a and 220b may be provided with a light scattering structure having light scattering anisotropy as a relief structure for displaying a structural color.

  The light scattering structure having light scattering anisotropy includes a plurality of concave portions and / or convex portions provided on the surface of the light transmission layer 225a or 225b. These concave portions and / or convex portions have a shape extending substantially in one direction when viewed from the Z direction. And these recessed parts and / or convex parts are irregular in at least one of length and width. Or these recessed parts and / or convex parts are arrange | positioned irregularly. For example, at least one of the pitch in the width direction and the position in the length direction of these recesses and / or projections is irregular. Alternatively, these concave portions and / or convex portions are irregularly arranged with at least one of length and width irregular.

  Such a light scattering structure has a low light scattering ability in a plane parallel to the length direction of the concave and / or convex portions, but is in a plane perpendicular to the length direction of the concave and / or convex portions. The light scattering ability is high. Therefore, if the length direction of the concave portion and / or the convex portion is different between the display element 220a and the display element 220b, for example, the scattered light emitted from the display element 220a and the scattered light emitted from the display element 220b are given to the observer. , And can be perceived by the right eye and the left eye, respectively.

The image display 22 and the labeled article 100 can be further modified.
FIG. 11 is an enlarged plan view showing still another example of a structure that can be employed in the labeled article shown in FIG. 12 is a cross-sectional view taken along line XII-XII of the structure shown in FIG.

  The structure shown in FIGS. 11 and 12 is the same as the structure described with reference to FIGS. 8 and 9 except for the following points.

  That is, the structure shown in FIGS. 11 and 12 does not include the luminance adjustment element 220c. The structures shown in FIGS. 11 and 12 include display elements 220A to 220C instead of the display elements 220a and 220b. Each of the display elements 220A to 220C is the same as the display element 220a or 220b except for the following points.

  The first display elements 220A are arranged corresponding to at least a part of the pixels. That is, at least one pixel includes the display element 220A.

  The display element 220A has visible light transparency. The display element 220A emits diffracted light having a first wavelength in the visible range in the second direction, for example, when illuminated with white light from the first direction under a specific illumination condition. It is configured as follows. Here, as an example, it is assumed that the diffracted light of the first wavelength is blue light.

  The display element 220A includes a first light transmission layer 223A, a first reflection layer 224A, a first resin layer 225A, and a first protective layer 227A.

  The light transmission layer 223A has light transmission properties, specifically visible light transmission properties, and is typically a transparent layer. As the material of the light transmission layer 223A, for example, the materials described above for the light transmission layer 223a or 223b can be used.

  A first relief structure is provided on one main surface of the light transmission layer 223A. Here, the first relief structure is provided on the entire one main surface of the light transmission layer 223A. The first relief structure may be provided only on a part of one main surface of the light transmission layer 223A.

  The first relief structure is a diffractive structure, ie a diffraction grating and / or a hologram. The first relief structure emits diffracted light having a first wavelength in the visible range in a second direction when illuminated with white light from a specific illumination condition, for example, the first direction.

  The reflection layer 224A covers at least a part of the surface of the light transmission layer 223A where the relief structure is provided. The reflective layer 224A has visible light permeability. As the reflective layer 224A, for example, the above-described transparent reflective layer can be used.

  The resin layer 225A covers the reflective layer 224A. As the material of the resin layer 224A, for example, the materials described above for the resin layer 225a or 225b can be used.

  The protective layer 227A covers the back surface of the surface provided with the relief structure of the light transmission layer 223A. As the material of the protective layer 227A, for example, those described above for the protective layer 227a or 227b can be used. The protective layer 227A can be omitted.

  The second display elements 220B are arranged corresponding to a part of the pixels. That is, at least one pixel includes the display element 220B.

  Further, the pixel including the display element 220B and the pixel including the display element 220A partially overlap. Here, as an example, some pixels include the display element 220A and do not include the display element 220B, and some other pixels include the display element 220B and do not include the display element 220A. It is assumed that some of the pixels include display elements 220A and 220B, and the remaining pixels do not include display elements 220A and 220B.

  In the pixel including the display elements 220A and 220B, the display element 220B faces the display element 220A. In the pixel including the display elements 220A and 220B, the display element 220A is interposed between the display element 220B and the cover body 21.

  The display element 220B has visible light transparency. The display element 220B emits diffracted light having the second wavelength in the visible range in the second direction when illuminated with white light from the first direction under the above illumination conditions, for example. It is configured as follows. The second wavelength is different from the first wavelength. Here, as an example, it is assumed that the diffracted light of the second wavelength is red light.

  The display element 220B includes a second light transmission layer 223B, a second reflection layer 224B, a second resin layer 225B, and a second protective layer 227B.

  The light transmission layer 223B has a light transmission property, specifically a visible light transmission property, and is typically a transparent layer. As the material of the light transmission layer 223B, for example, the materials described above for the light transmission layer 223a or 223b can be used.

  A second relief structure is provided on one main surface of the light transmission layer 223B. Here, the second relief structure is provided only on a part of one main surface of the light transmission layer 223B. The area of the main surface where the second relief structure is provided has a smaller area than the area of the main surface of the light transmitting layer 223A where the first relief structure is provided.

  The second relief structure is a diffractive structure, ie a diffraction grating and / or a hologram. The second relief structure emits diffracted light having a second wavelength in the visible range in the second direction when illuminated with white light from the above illumination condition, for example, the first direction.

  The reflection layer 224B covers at least part of the surface of the light transmission layer 223B where the relief structure is provided. The reflective layer 224B has visible light permeability. As the reflective layer 224B, for example, the above-described transparent reflective layer can be used.

  The resin layer 225B covers the reflective layer 224B. As the material of the resin layer 224B, for example, the materials described above for the resin layer 225a or 225b can be used.

  The protective layer 227B covers the back surface of the surface provided with the relief structure of the light transmission layer 223B. As the material of the protective layer 227B, for example, the materials described above for the protective layer 227a or 227b can be used. The protective layer 227B can be omitted.

  The third display element 220C is arranged corresponding to a part of the pixels. That is, at least one pixel includes the display element 220C.

  In addition, the pixel including the display element 220C and the pixel including at least one of the display elements 220A and 220B partially overlap. Here, as an example, some pixels include the display element 220A and do not include the display elements 220B and 220C, and some other pixels include the display elements 220A and 220B and include the display element 220C. Further, some other pixels include display elements 220A to 220C, some other pixels include 220B and do not include display elements 220A and 220C, and some other pixels display. Includes elements 220B and 220C and does not include display element 220A, and some other pixels include 220C and does not include display elements 220A and 220B, and the remaining pixels include display elements 220A to 220C. Not to be.

  In the pixel including the display elements 220A and 220C, the display element 220C faces the display element 220A. In the pixel including the display elements 220A and 220C, the display element 220A is interposed between the display element 220C and the cover body 21.

  In the pixel including the display elements 220B and 220C, the display element 220C faces the display element 220B. In the pixel including the display elements 220B and 220C, the display element 220B is interposed between the display element 220C and the cover body 21.

  The display element 220C has visible light transparency. The display element 220C emits diffracted light having a third wavelength in the visible range in the second direction when illuminated with white light from the first direction, for example, under the above illumination conditions. It is configured as follows. The third wavelength is different from the first and second wavelengths. Here, as an example, it is assumed that the diffracted light of the third wavelength is green light.

  The display element 220C includes a third light transmission layer 223C, a third reflection layer 224C, a third resin layer 225C, and a third protective layer 227C.

  The light transmission layer 223C has a light transmission property, specifically a visible light transmission property, and is typically a transparent layer. As the material of the light transmission layer 223C, for example, the materials described above for the light transmission layer 223a or 223b can be used.

  A third relief structure is provided on one main surface of the light transmission layer 223C. Here, the third relief structure is provided only on a part of one main surface of the light transmission layer 223C. The area of the main surface in which the third relief structure is provided has a smaller area than the area of the light transmission layer 223B in which the second relief structure is provided in the main surface.

  The third relief structure is a diffractive structure, ie a diffraction grating and / or a hologram. The third relief structure emits diffracted light having a third wavelength in the visible range in the second direction when illuminated with white light from the above illumination condition, for example, the first direction.

  The reflection layer 224C covers at least part of the surface of the light transmission layer 223C where the relief structure is provided. The reflective layer 224C has visible light permeability. As the reflective layer 224C, for example, the above-described transparent reflective layer can be used.

  The resin layer 225C covers the reflective layer 224C. As the material of the resin layer 224C, for example, the materials described above for the resin layer 225a or 225b can be used.

  The protective layer 227C covers the back surface of the surface provided with the relief structure of the light transmission layer 223C. As the material of the protective layer 227C, for example, the materials described above for the protective layer 227a or 227b can be used. The protective layer 227C can be omitted.

  When this configuration is adopted, each pixel can be displayed with blue by the diffracted light of the first wavelength, red by the diffracted light of the second wavelength, or green by the diffracted light of the third wavelength. It is also possible to display a color generated by additive color mixing. That is, a multicolor image can be displayed without dividing each pixel into sub-pixels having different display colors.

  Further, in this structure, the area of the region where the first relief structure is provided, the area of the region where the second relief structure is provided, and the area of the region where the third relief structure is provided are In order to make it smaller. In this case, by appropriately setting the area ratio, for example, a pixel including only one of the display elements 220A to 220C, a pixel including any two of the display elements 220A to 220C, and a display The target hue can be easily reproduced in each of the pixels including the elements 220A to 220C.

  In this structure, any one of the display elements 220A to 220C may be omitted. Alternatively, this structure may further include another display element having a wavelength of diffracted light different from that of the display elements 220A to 220C. When a diffraction grating is provided as the diffraction structure, the wavelength of the diffracted light can be controlled by the grating constant and / or the length direction of the groove.

  The structure may further include the brightness adjustment element 220c described with reference to FIGS.

  It is also possible to display a multicolor stereoscopic image using the structure described with reference to FIGS. 11 and 12. For example, each pixel is composed of a right-eye subpixel and a left-eye subpixel, and the structure employed in each pixel in the image display body 22 in FIGS. 11 and 12 is employed in each subpixel. May be. Alternatively, in each pixel, a plurality of right-eye display elements having different display colors and a plurality of left-eye display elements having different display colors may be stacked. That is, the structure described with reference to FIGS. 11 and 12 may be combined with the structure described with reference to FIGS. 2 and 3 or the structure described with reference to FIGS. Of course, instead of employing a configuration for displaying a multicolor stereoscopic image, a configuration in which the display image is switched according to the observation angle may be employed.

  DESCRIPTION OF SYMBOLS 1 ... Signature, 2 ... Cover, 11 ... Paper piece, 12 ... Print pattern, 21 ... Cover body, 22 ... Image display body, 22 '... Transfer material layer, 100 ... Article with label, 201a ... Transfer foil, 201b ... Transfer Foil, 220a ... first display element, 220A ... first display element, 220a '... transfer material layer, 220b ... second display element, 220B ... second display element, 220b' ... transfer material layer, 220c ... luminance adjustment element, 220C ... third display element, 223a ... first light transmission layer, 223A ... first light transmission layer, 223a '... light transmission layer, 223b ... second light transmission layer, 223B ... second light transmission layer, 223b' ... light Transmission layer, 223c ... light transmission layer, 223C ... third light transmission layer, 224 ... specular reflection layer, 224 '... specular reflection layer, 224a ... first reflection layer, 224A ... first reflection layer, 224a' ... reflection layer, 224b ... second reflective layer, 24B ... second reflective layer, 224b '... reflective layer, 224c ... reflective layer, 224C ... third reflective layer, 225 ... resin layer, 225a ... first resin layer, 225A ... first resin layer, 225a' ... resin layer, 225b ... second resin layer, 225B ... second resin layer, 225b '... resin layer, 225c ... resin layer, 225C ... third resin layer, 226 ... support, 226a ... support, 226b ... support, 227 ... protection Layer, 227 '... peel protective layer, 227a ... first protective layer, 227A ... first protective layer, 227a' ... peel protective layer, 227b ... second protective layer, 227B ... second protective layer, 227b '... peel protective layer 227c ... protective layer, 227C ... third protective layer, 2251 ... resin layer, 2251 '... resin layer, 2252 ... resin layer, 2252' ... resin layer, Ga ... groove, Gb ... groove, I1a ... image, I1b ... image , I2 ... Image I3 ... image.

Claims (14)

An image display body that displays an image that is visible to the naked eye by an observer observing the front surface when the front surface is illuminated with natural light,
A plurality of pixels arranged two-dimensionally,
One or more of the plurality of pixels includes a first display element having visible light transmission, and the first display element has a first main surface provided with at least a part of a first relief structure. A first light transmission layer having a first reflective layer covering the first main surface,
At least one of the pixels including the first display element further includes a second display element having visible light transparency in front of the first display element, and the second display element includes A second light transmission layer having a second main surface provided with at least a part of a two-relief structure; and a second reflective layer covering the second main surface, The area where the second relief structure is provided has a smaller area than the area where the first relief structure is provided in the first main surface,
Another one or more of said plurality of pixels, Orazu provided with the first display element includes a front Stories second display element,
The arrangement of the first relief structure displays a first image as a structural color image when viewed from a first direction under a specific illumination condition, and the first direction is different from the first direction under the illumination condition. The first image is not displayed as a structural color image when viewed from a different second direction, or the first image is displayed as a darker structural color image as compared to the first direction viewed from the first direction;
The arrangement of the second relief structure displays a second image as a structural color image when viewed from the second direction under the illumination condition, and observes from the first direction under the illumination condition. In such a case, the image display body does not display the second image as a structural color image or displays the second image as a darker structural color image than when the second image is observed from the second direction.   One or more of the plurality of pixels includes the first display element, does not include the second display element, includes the first display element, and does not include the second display element. The image display body according to claim 1, wherein each of the pixels further includes a luminance adjustment element that has visible light transparency and does not display a structural color, in front of the first display element.   3. The image display body according to claim 2, wherein the brightness adjusting element has the same structure, material, and dimensions as the second display element except that the second relief structure is not provided on the second main surface.   The image display body according to claim 1, further comprising a specular reflection layer behind the plurality of pixels.   The image display body according to claim 1, wherein each of the first and second relief structures is a diffraction grating or a hologram.   The first and second relief structures and their arrangement are when the observer views one of the first and second images with the right eye and the other of the first and second images with the left eye The image display body according to claim 1, wherein the image display body is configured to perceive a stereoscopic image.   The first relief structure displays the first structural color when observed from the first direction under the illumination condition, and the first relief structure when observed from the first direction under the illumination condition. A second structural color that is different from the first structural color and a third structural color that is different from the first and second structural colors when viewed from the first direction under the illumination conditions. The second relief structure displays a fourth structural color when viewed from the second direction under the illumination condition and the second direction under the illumination condition. A fifth structural color that is different from the fourth structural color when viewed from above and a fourth structural color different from the fourth and fifth structural colors when viewed from the second direction under the illumination conditions Displaying each of the sixth structural colors, each of the first and second images The image display body according to any one of claims 1 to 6, which is a multi-color image.   The image display body according to any one of claims 1 to 7, wherein at least one of the first and second images includes personal information. An image display body that displays an image that is visible to the naked eye by an observer observing the front surface when the front surface is illuminated with natural light,
A plurality of pixels arranged two-dimensionally,
One or more of the plurality of pixels includes a first display element having visible light transmission, and the first display element has a first main surface provided with at least a part of a first relief structure. A first reflective layer that covers the first main surface, and the first relief structure emits the first diffracted light under a specific illumination condition. Composed of
Another one or more of the plurality of pixels does not include the first display element, but includes a second display element having visible light transmission, and the second display element has a second relief structure. Includes a second light transmission layer having a second main surface provided at least in part, and a second reflection layer covering the second main surface, wherein the second relief structure has the illumination condition The first relief structure is configured to emit second diffracted light having a wavelength different from that of the first diffracted light in a direction in which the first diffracted light is emitted. Of these, the area where the second relief structure is provided has a smaller area than the area where the first relief structure is provided on the first main surface,
The part of the pixel including the first display element further includes the second display element in front of the first display element,
When the image display body is observed from the direction under the illumination condition, an area corresponding to the pixel including only the first display element among the first and second display elements; A structure in which hue is different between an area corresponding to the pixel including only the second display element and an area corresponding to the pixel including both the first and second display elements among the first and second display elements An image display that displays color images.   The image display body according to claim 9, wherein the structural color image includes personal information.   The image display body according to claim 8 or 10, wherein the personal information includes a face image. The image display body according to any one of claims 1 to 11,
A transfer foil comprising a support that releasably supports the image display on the front side.   A labeled article comprising the image display body according to any one of claims 1 to 11 and a base material supporting the image display body.   The labeled article according to claim 13, which is used for personal authentication.

Images