JP5569234B2 - Information media - 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.

  On the other hand, a method using laser irradiation has been developed as a method for recording an image that is difficult to forge. For example, in Patent Document 4, a desired symbol can be formed by irradiating a laminated body including a partially reflective layer with a short wavelength laser to at least partially remove the partially reflective layer. (Claim 6).

  Further, Patent Document 5 discloses that “a transparent base material, a hologram forming layer having a transparent resin layer laminated on the back surface of the transparent base material and having fine hologram irregularities on the back surface, and the fine hologram forming layer” A reflective hologram composite composed of a reflective metal layer laminated along the unevenness, a color variable layer, and a colored layer, and the reflective metal layer has a pattern constituted by the presence or absence of the reflective metal layer. And the color variable layer is laminated with the reflective hologram composite to form a laminate, and the colored layer is laminated on the back of the laminate. "Body" is described (claim 1). Patent Document 5 also describes that the pattern configured with or without a reflective metal layer is formed using a laser beam or the like (paragraph 0009).

JP 2000-141863 A JP 2002-226740 A Japanese Patent Laid-Open No. 2003-170685 JP 2002-522263 A JP 2006-145688 A

  An object of the present invention is to provide a technique that makes it possible to display an image that is difficult to tamper with and has high visibility.

According to the first aspect of the present invention, a base material for displaying an image including personal information, an image display body supported by the base material, the first portion including a metal layer and exhibiting a structural color, A first layer comprising a second portion adjacent to the first portion and having a higher visible light transmittance than the first portion; and a third portion facing the first portion and including a resin; comprising said image display body and a second layer visible light absorptance and a higher fourth portion, a compared to the second portion and facing and said third portion, said image display An information medium is provided in which the image displayed includes first personal information, the image displayed by the base material includes second personal information, and the first and second personal information are information of the same person .

  According to the present invention, it is possible to display an image that is difficult to tamper with and has high visibility.

1 is a plan view schematically showing an information medium according to one embodiment of the present invention. The top view which shows roughly the image display body which concerns on 1 aspect of this invention. Sectional drawing along the III-III line of the image display body shown in FIG. Sectional drawing which shows schematically the image display body which concerns on one modification. Sectional drawing which shows schematically the image display body which concerns on another modification. Sectional drawing which shows schematically the image display body which concerns on another modification. Sectional drawing which shows schematically the image display body which concerns on another modification. Sectional drawing which shows schematically the image display body which concerns on another modification. Sectional drawing which shows roughly an example of the blank medium which can be utilized for manufacture of the image display body which concerns on 1 aspect of this invention. Sectional drawing which shows roughly an example of the manufacturing method of the image display body which concerns on 1 aspect of this invention. The top view which shows roughly the information medium which concerns on the other aspect of this invention. The perspective view which shows roughly the information medium which concerns on the other aspect of this invention.

  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 an information medium according to an aspect of the present invention.
An information medium 100 shown in FIG. 1 is a personal authentication medium, and is a booklet such as a passport. FIG. 1 shows the booklet in an open state.

The information medium 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 an information medium described later.

  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 I1b 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. The image I1b 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, the combination of the image I3 and at least one of the images I1a and I1b can make the information medium 100 more difficult to falsify.

  A portion of the information medium 100 corresponding to the image I1b includes an image display body 200 described below.

  FIG. 2 is a plan view schematically showing an image display body according to an aspect of the present invention. 3 is a cross-sectional view of the image display body shown in FIG. 2 taken along the line III-III. 2 and 3, directions parallel to the main surface of the image display body 200 and orthogonal to each other are defined as an X direction and a Y direction, and a direction perpendicular to the main surface is defined as a Z direction. 2 and 3, a portion of the image display body 200 in which a first portion P1 and a third portion P3, which will be described later, face each other is referred to as a display portion DP1, and a second portion P2 and a fourth portion P4 which will be described later. The part facing is a display part DP2.

First, the configuration of the image display body 200 shown in FIGS. 2 and 3 will be described.
The image display body 200 shown in FIGS. 2 and 3 includes a first layer 201 and a second layer 202. In FIG. 3, as an example, the case where the first layer 201 is located on the front side with respect to the second layer 202 is depicted.

The first layer 201 includes a first portion P1 and a second portion P2.
The first portion P1 includes a metal layer and exhibits a structural color. The first portion P1 typically displays different colors depending on the viewing angle under specific illumination conditions.

The metal layer included in the first portion P1 includes, for example, a simple metal, an alloy, a metal oxide, or a metal sulfide. Examples of the metal or alloy contained in the metal layer include aluminum, gold, copper, silver, nickel, Inocell (registered trademark), MoS ₂ and Fe ₂ O ₃ . It is particularly preferable that the metal layer contains aluminum.

  The first portion P1 includes, for example, a pigment that includes a metal layer and exhibits a structural color. The first portion P1 is formed using, for example, an ink containing a pigment including a metal layer and exhibiting a structural color, a solvent, and a binder resin.

  The pigment including a metal layer and exhibiting a structural color is, for example, a laminate including a metal layer and a layer having a refractive index different from that of the metal layer. This laminate can be obtained, for example, by pulverizing a multilayer film including a metal layer and a layer having a refractive index different from that of the metal layer.

  As such a multilayer film, for example, a multilayer film in which a half mirror layer, a spacer layer, and a mirror layer are laminated in this order can be used. Alternatively, as such a multilayer film, a multilayer film in which a first half mirror layer, a first spacer layer, a mirror layer, a second spacer layer, and a second half mirror layer are stacked in this order may be used. These multilayer films will be described in detail later with reference to FIGS.

  The second portion P2 is adjacent to the first portion P1 in the in-plane direction. 2 and 3 illustrate, as an example, a case where the second portion P2 and the first portion P1 are adjacent to each other.

  The second portion P2 has a higher visible light transmittance than the first portion P1. Here, “visible light transmittance” means the total light transmittance for light in the visible range. The “total light transmittance” is a measured value based on Japanese Industrial Standards JIS K7361-1.

  The second portion P2 typically does not include a metal layer, or includes a metal layer having a smaller film thickness compared to the metal layer included in the first portion P1. In the latter case, the metal constituting the metal layer included in the second portion P2 is typically the same as that constituting the metal layer included in the first portion P1.

  The second portion P2 may include a particulate metal instead of or in addition to the metal layer. This metal is typically the same as that constituting the metal layer included in the first portion P1.

The second layer 202 includes a third portion P3 and a fourth portion P4.
The third portion P3 faces the first portion P1. The orthogonal projection of the third portion P3 onto the main surface of the image display body 200 typically matches the orthogonal projection of the first portion P1 onto the main surface. Here and in the following, the “match” of the orthogonal projection of each part does not mean a mathematically exact “match”, and the positional deviation of the image displayed based on each part is not visually recognized. It means possible "match" to some extent.

  The third portion P3 includes a resin. Examples of this resin include polycarbonate resin, polyamide resin, polyimide resin, polyamideimide resin, polyester resin, polyester carbonate resin, polyether resin, polyether ketone resin, polyacrylate resin, polymethacrylate resin, ABS (acrylonitrile-butadiene-). Styrene copolymer) resins, polyolefin resins such as polyethylene resins and polypropylene resins, polystyrene resins, polyvinyl chloride resins, polyoxymethylene resins, polysulfone resins, polyester sulfone resins, polyphenylene sulfide resins, silicone resins, and rubber resins.

  The resin contained in the third portion P3 may be configured such that the visible light absorption rate is increased by irradiation with an energy beam.

  For example, this resin may contain an additive. As this additive, an infrared absorber is mentioned, for example. When a resin containing such an additive is used, carbonization of the resin around the additive can be caused, for example, by irradiation with an energy beam in the infrared region. That is, when such a configuration is employed, the visible light absorption rate can be increased by irradiation with an energy beam.

  The third portion P3 is typically transparent. In this case, the third portion P3 may be colorless and transparent, or may be colored and transparent.

  The fourth portion P4 is adjacent to the third portion P3 in the in-plane direction. 2 and 3 illustrate a case where the fourth portion P4 and the third portion P3 are adjacent to each other as an example.

  The fourth part P4 faces the second part P2. The orthogonal projection of the fourth portion P4 onto the main surface of the image display body 200 typically matches the orthogonal projection of the second portion P2 onto the main surface. Further, when the first part P1 and the second part P2 are adjacent to each other and the third part P3 and the fourth part are adjacent to each other, the main surface at the boundary between the first part P1 and the second part P2 Typically, the orthogonal projection onto the boundary coincides with the orthogonal projection onto the main surface at the boundary between the third portion P3 and the fourth portion.

  The fourth portion P4 has a higher visible light absorption rate than the third portion P3. There is no restriction | limiting in particular in the structure of the 4th part P4. For example, when the resin contained in the third portion P3 is configured such that the visible light absorption rate is increased by irradiation of the energy beam, the fourth portion P4 is obtained by irradiating the resin with the energy beam. It may contain a substance.

  Next, the optical effect shown by the image display body 200 shown in FIGS. 2 and 3 will be described.

  In the image display body 200, the display portion DP1 has a laminated structure including a first portion P1 and a third portion P3. On the other hand, the display portion DP2 has a laminated structure including the second portion P2 and the fourth portion P4.

  As described above, the first portion P1 exhibits a structural color. In addition, the third portion P3 has a lower visible light absorptance than the fourth portion P4. Therefore, when the image display body 200 shown in FIGS. 2 and 3 is observed from the front side, the display unit DP1 displays a relatively bright image while exhibiting a structural color.

The second portion P2 has a higher visible light transmittance than the first portion P1. In addition, the fourth portion P4 has a higher visible light absorption rate than the third portion P3. Therefore, when the image display body 200 shown in FIGS. 2 and 3 is observed from the front side, the display unit DP2 displays a darker image compared to the display unit DP1.

  Thus, the display part DP1 displays a bright image due to the combination of the first part P1 and the third part P3, and the display part DP2 is due to the combination of the second part P2 and the fourth part P4. Display a dark image.

  Accordingly, the image displayed by the comparison between the display part DP1 and the display part DP2 is, for example, an image displayed based only on the comparison between the first part P1 and the second part P2, or the third part P3 and the second part P2. Compared with the image displayed based only on the comparison with the four portions P4, it has a remarkably high contrast. That is, the image displayed by contrast between the display part DP1 and the display part DP2 has extremely high visibility.

  Further, the display unit DP1 and the display unit DP2 exhibit different optical effects when the image display body 200 shown in FIGS. 2 and 3 is observed from the back side. Therefore, the image display body 200 shown in FIGS. 2 and 3 displays an image based on the comparison between the display part DP1 and the display part DP2 even when observed from the back side. Therefore, it is relatively difficult to tamper with the image displayed by the image display 200.

  As described above, the second portion P2 may include a particulate metal instead of or in addition to the metal layer. In this case, examples of the material of the second portion P2 include aluminum paste, carbonyl iron powder, and OVI (optical variable ink).

  The third portion P3 is typically transparent. In this case, when the image display body 200 shown in FIGS. 2 and 3 is observed from the back side, the optical effect caused by the first portion P1 can be visually recognized on the display unit DP1. Therefore, in this case, even when observed from the back side, the structural color resulting from the first portion P1 can be visually recognized by the observer. Therefore, in this case, it is more difficult to tamper with the image displayed by the image display body 200.

  Then, the orthogonal projection of the fourth portion P4 onto the main surface of the image display body 200 is typically matched with the orthogonal projection of the second portion P2 onto the main surface. In this way, the positional deviation between the image displayed based on the second portion P2 and the image displayed based on the fourth portion P4 is reduced, and the image quality of the image displayed by the image display body 200 can be further improved. it can.

The image display body described above can be variously modified.
FIG. 4 is a cross-sectional view schematically showing an image display body according to a modification. The image display body 200 shown in FIG. 4 has the same configuration as the image display body shown in FIGS. 2 and 3 except that the configuration of the first portion P1 is different.

  In the image display body 200 shown in FIG. 4, the first portion P1 includes a multilayer film in which a half mirror layer 201A, a spacer layer 201B, and a mirror layer 201C are stacked in this order. FIG. 4 illustrates a case where the half mirror layer 201 </ b> A is located on the front side of the image display body 200 and the mirror layer 201 </ b> C is located on the back side of the image display body 200 as an example.

The half mirror layer 201A is a metal layer, and typically includes a simple metal, an alloy, a metal oxide, or a metal sulfide. Examples of the metal or alloy contained in the half mirror layer 201A include aluminum, nickel, Inocell (registered trademark), MoS ₂ and Fe ₂ O ₃ . The thickness of the half mirror layer 201A is, for example, in the range of 5 to 20 nm.

The spacer layer 201B typically includes a dielectric material. The refractive index of this dielectric material is preferably 1.65 or less. The dielectric material is preferably transparent. Examples of such a dielectric material include SiO ₂ and MgF ₂ . The thickness of the spacer layer 201B is, for example, in the range of 300 to 500 nm.

  The mirror layer 201C is a metal layer, and typically includes a single metal or an alloy. Examples of the metal contained in the mirror layer 201C include aluminum, gold, copper, and silver. As this metal, aluminum is particularly preferable. The thickness of the mirror layer 201C is, for example, 300 nm or less, and is typically in the range of 50 to 150 nm. The mirror layer 201C may be provided with a diffractive structure.

  FIG. 5 is a cross-sectional view schematically showing an image display body according to another modification. The image display body 200 shown in FIG. 5 has the same configuration as the image display body shown in FIG. 4 except that the configuration of the first portion P1 is different.

  In the image display body 200 shown in FIG. 5, the first portion P1 includes a first half mirror layer 201A, a first spacer layer 201B, a mirror layer 201C, a second spacer layer 201D, and a second half mirror layer 201E stacked in this order. Multi-layered film. As the half mirror layers 201A and 201E and the spacer layers 201B and 201D, for example, the same configuration as described above with reference to FIG. 4 can be adopted.

  In the image display body 200 shown in FIG. 5, it is particularly preferable to employ a configuration in which the third portion P3 is transparent. Thus, even when the image display body 200 is observed from the back side, the structural color caused by the first portion P1 can be visually recognized by the observer.

FIG. 6 is a cross-sectional view schematically showing an image display body according to another modification.
In the image display body 200 shown in FIG. 6, a concavo-convex structure capable of emitting diffracted light by irradiation with white light is provided at the interface between the first portion P1 and the third portion P3. That is, the first portion P1 exhibits a structural color due to this uneven structure.

  The first portion P1 includes a resin layer 201a and a metal layer 201b. The concave / convex structure described above is provided on one main surface of the resin layer 201a. The metal layer 201b covers the main surface of the resin layer 201a provided with the uneven structure. As the metal layer 201b, for example, the configuration described above with reference to FIGS. 2 and 3 can be employed.

  FIG. 6 illustrates a case where a concavo-convex structure is also provided at the interface between the second portion P2 and the fourth portion P4. However, this concavo-convex structure may be omitted.

  FIG. 7 is a cross-sectional view schematically showing an image display body according to another modification. The image display body 200 shown in FIG. 7 has the same configuration as the image display body shown in FIGS. 2 and 3 except that the third portion P3 and the fourth portion P4 have a multilayer structure. ing.

  The third portion P3 includes a stacked structure in which the first resin layer 202A and the second resin layer 202B are stacked in this order.

  The first resin layer 202A typically includes a resin configured to increase the visible light absorption rate upon irradiation with an energy beam. Examples of such a resin include those described above with reference to FIGS. 2 and 3.

  The second resin layer 202B faces the first portion P1 with the first resin layer 202A interposed therebetween. The resin contained in the second resin layer 202B is typically transparent with respect to the wavelength of the energy beam. That is, this resin is typically a resin that does not substantially increase the visible light absorption even when irradiated with the energy beam.

  The resin included in the first resin layer 202A and the resin included in the second resin layer 202B are preferably the same type of resin except for the presence or absence of an additive. As such a configuration, for example, a mode in which the second resin layer 202B contains a polycarbonate resin and the first resin layer 202A contains a polycarbonate resin containing an additive can be cited. When such a configuration is employed, peeling between the first resin layer 202A and the second resin layer 202B is less likely to occur, and the durability of the image display body 200 is further improved.

The fourth portion P4 includes a stacked structure in which the third resin layer 202A ′ and the fourth resin layer 202B ′ are stacked in this order.
The third resin layer 202A ′ is adjacent to the first resin layer 202A. The third resin layer 202A ′ typically includes a substance obtained by irradiating the resin included in the first resin layer 202A with an energy beam. That is, the third resin layer 202A ′ typically has a higher visible light absorption rate than the first resin layer 202A.

  The fourth resin layer 202B 'is adjacent to the second resin layer 202B. The fourth resin layer 202B 'faces the second portion P2 with the third resin layer 202A' interposed therebetween. The third resin layer 202A 'typically has the same configuration as the first resin layer 202A. That is, the fourth resin layer 202B 'typically has the same visible light absorptance as the second resin layer 202B.

  When such a configuration is adopted, for example, it is more difficult to falsify the information recorded in the fourth portion P4 than in the case where the fourth portion P4 is composed only of the third resin layer 202A '. That is, when such a configuration is adopted, it is possible to further make it difficult to tamper with the image displayed based on the fourth portion P4.

In FIGS. 2 to 7, the image display 200 has been described a case consisting of only the first layer 201 and the second layer 20 2, the image display body 200, also include additional layers other than those Good.

  FIG. 8 is a cross-sectional view schematically showing an image display body according to another modification. The image display body 200 shown in FIG. 8 has the same configuration as the image display body shown in FIG. 7 except that it further includes a protective layer 203.

  The protective layer 203 faces the second layer 202 with the first layer 201 interposed therebetween. The protective layer 203 has, for example, the same configuration as the second resin layer 202B described above with reference to FIG.

  When such a configuration is adopted, it is more difficult to falsify information recorded in the second portion P2 than when the protective layer 203 is omitted. That is, when such a configuration is adopted, it is possible to make it more difficult to tamper with the image displayed based on the second portion P2.

  In addition, you may employ | adopt for the various modification demonstrated above in combination with two or more.

Then, an example of the manufacturing method of the image display body 200 is demonstrated. The image display body 200 can be manufactured using, for example, a blank medium described below.
FIG. 9 is a cross-sectional view schematically illustrating an example of a blank medium that can be used for manufacturing an image display body according to an aspect of the present invention.

The blank medium shown in FIG. 9 includes a first recording layer 301 and a second recording layer 302.
The first recording layer 301 includes a metal layer and exhibits a structural color. As the first recording layer 301, for example, the same configuration as described for the first portion P1 can be employed.

  The second recording layer 302 is at least partially facing the first recording layer 301. The second recording layer 302 is configured such that the visible light absorption rate is increased by irradiation with an energy beam. As the second recording layer 302, for example, the same configuration as described above for the third portion P3 can be adopted.

As described above, the blank medium 300 is used for manufacturing the image display body 200.
FIG. 10 is a cross-sectional view schematically illustrating an example of a method for manufacturing an image display body according to an aspect of the present invention.

  FIG. 10 shows a state in which the energy beam EB is irradiated to a part of the laminated portion where the first recording layer 301 and the second recording layer 302 face each other in the blank medium 300 shown in FIG. When this laminated portion is irradiated with the energy beam EB, the following changes occur.

  First, the metal layer included in the first recording layer 301 is destroyed at the position where the energy beam EB is irradiated in the first recording layer 301. Thereby, the visible light transmittance increases at the position of the first recording layer 301. That is, this makes it possible to form the second portion P2 described above. A portion of the first recording layer 301 that is not irradiated with the energy beam EB corresponds to the first portion P1 described above.

  The second portion P2 formed in this way does not include a metal layer, or includes a metal layer having a smaller film thickness than the metal layer included in the first portion P1.

  In addition, the present inventors have found that the second portion P2 formed in this manner typically contains a particulate metal. The present inventors speculate that these particulate metals are formed by agglomeration of the metals constituting the metal layer due to the destruction of the metal layer by irradiation of the energy beam EB. doing.

  Next, the visible light absorptance increases at the position of the second recording layer 302 irradiated with the energy beam EB. Thereby, the 4th part P4 demonstrated previously can be formed. A portion of the second recording layer 302 that is not irradiated with the energy beam EB corresponds to the third portion P3 described above.

  Thus, the image display body 200 can be manufactured by irradiating the blank medium 300 with the energy beam EB.

  According to this method, a desired image can be recorded on demand. Therefore, this method is particularly useful when recording individual information such as personal information.

  Further, according to this method, it is relatively easy to align the image recorded on the first recording layer 301 and the image recorded on the second recording layer 302. That is, according to this method, it is relatively easy to match the orthogonal projection of the fourth portion P4 onto the main surface of the image display body 200 and the orthogonal projection of the second portion P2 onto the main surface. Therefore, according to this method, the image quality of the image displayed by the image display body 200 can be further improved.

  The irradiation of the energy beam EB to the first recording layer 301 and the irradiation of the energy beam EB to the second recording layer 302 may be performed simultaneously or in stages. However, in the former case, as compared with the latter case, it is possible to further reduce the positional deviation between the image recorded on the first recording layer 301 and the image recorded on the second recording layer 302. That is, in the former case, the image quality of the image displayed by the image display body 200 can be further improved compared to the latter case.

A laser beam is usually used as the energy beam EB. Typically, an Nd: YAG laser is used as the laser beam irradiation source. Alternatively, an Nd: YVO ₄ laser, a carbon dioxide laser, or a laser diode may be used as a laser beam irradiation source.

  The energy beam EB may be other than the laser beam. For example, a charged particle beam such as an electron beam may be employed. According to the electron beam drawing apparatus, a smaller beam diameter can be achieved as compared with the laser. Therefore, in this case, a higher definition image can be recorded.

  The blank medium 300 may further include one or more additional layers in addition to the first recording layer 301 and the second recording layer 302. However, these additional layers are preferably transparent to the wavelength of the energy beam EB. This makes it possible to more efficiently record images on the first recording layer 301 and the second recording layer 302.

  The image display body 200 described above is typically used as a part of the information medium 100. In this case, the second layer 202 of the image display body 200 may be common with the base material constituting the information medium 100. Or the image display body 200 may be affixed on the base material which comprises the information medium 100 via the contact bonding layer.

  In the above, the information medium 100 as a passport has been illustrated, but the technique described above for the information medium 100 can also be applied to other information media. For example, this technique can also be applied to various cards such as a visa card, an ID card, and a game card. Alternatively, this technique may be applied to other personal authentication media such as a basic resident register.

  FIG. 11 is a plan view schematically showing an information medium according to another aspect of the present invention. An information medium 400 shown in FIG. 11 is an ID card, and includes an image I1b based on the image display body 200 described above. Therefore, this information medium 400 is difficult to tamper with.

  In the above, personal authentication media such as a passport and an ID card are exemplified as the information media. However, the technology described above for the information media 100 and 400 can also be applied to information media other than the personal authentication media. That is, the above-described technique may be used for purposes other than personal authentication.

  FIG. 12 is a perspective view schematically showing an information medium according to another aspect of the present invention. An information medium 500 shown in FIG. 12 is an article such as a printer part or an automobile part, and includes an image I1b based on the image display body 200 described above. For example, the image I1b individually displays information on a country and a region where the article should be distributed. Thereby, for example, it becomes possible to track illegal distribution of the article.

The image display body 200 described with reference to FIG. 8 was manufactured as follows.
First, an ink containing a pigment containing a metal layer and displaying a structural color was applied to one main surface of the protective layer 203 made of polycarbonate by screen printing. Thereby, the first recording layer 301 was formed on one main surface of the protective layer 203. As the ink, OVI manufactured by Shikupa was used. Further, the thickness of the protective layer 203 was 100 μm, and the thickness of the first recording layer 301 was 10 μm.

  Next, an A layer made of polycarbonate, and a B layer made of polycarbonate (made by Bayer; Makrofol ID 6-2 750061; thickness 100 μm) configured to increase the visible light absorption rate upon irradiation with an energy beam. A second recording layer 302 made of a laminate was prepared. Each of these layers had a thickness of 100 μm. That is, the thickness of the second recording layer 302 was 200 μm.

  Subsequently, the first recording layer 301 provided on one main surface of the protective layer 203 and the B layer constituting the second recording layer 302 are fixed so as to face each other, and in this state, heat fusion is performed. I wore it. Thus, the blank medium 300 used for manufacture of the image display body 200 was prepared.

  Next, a part of the blank medium 300 was irradiated with an Nd: YAG laser (wavelength = 1064 nm) at an intensity of 1600 mW to draw a face image. That is, by this laser irradiation, the second part P2 and the fourth part P4 were formed at the same time, and a face image was recorded as an image by comparison between the display part DP1 and the display part DP2.

  In this way, the image display body 200 described with reference to FIG. 8 was manufactured.

  When the image display body 200 was observed from the front side, the face image was clearly visible. That is, this face image has high visibility and excellent image quality. In addition, a portion of the image display body 200 corresponding to the display unit DP1 displayed images of different colors according to changes in the observation angle.

  Further, when the image display body 200 was observed from the back side, the face image was clearly visible. Moreover, even when the part corresponding to the display unit DP1 in the image display body 200 was observed from the back side, images of different colors were displayed according to the change in the observation angle.

  DESCRIPTION OF SYMBOLS 1 ... Signature, 2 ... Cover, 11 ... Paper piece, 12 ... Print pattern, 100 ... Information medium, 200 ... Image display body, 201 ... 1st layer, 201A ... Half mirror layer, 201B ... Spacer layer, 201C ... Mirror layer , 201D ... spacer layer, 201E ... half mirror layer, 201a ... resin layer, 201b ... metal layer, 202 ... second layer, 202A ... first resin layer, 202B ... second resin layer, 202A '... third resin layer, 202B '... fourth resin layer, 203 ... protective layer, 300 ... blank medium, 301 ... first recording layer, 302 ... second recording layer, 400 ... information medium, 500 ... information medium, DP1 ... display unit, DP2 ... display Part, EB ... energy beam, I1a ... image, I1b ... image, I2 ... image, I3 ... image, P1 ... first part, P2 ... second part, P3 ... third part, P4 ... fourth part.

Claims (7)

A base material for displaying an image including personal information;
An image display supported by the substrate,
A first layer comprising a metal layer and having a structural color; and a second portion adjacent to the first portion and having a higher visible light transmittance than the first portion;
A second layer comprising a third part facing the first part and containing a resin; and a fourth part facing the second part and having a higher visible light absorption rate compared to the third part ; said image display provided with the,
With
The image displayed by the image display body includes first personal information, the image displayed by the base material includes second personal information, and the first and second personal information are information on the same person.
Information medium. Wherein in the image display body, wherein the orthogonal projection of the main surface of the image display of the second portion, the fourth portion of the information medium of claim 1 match the orthogonal projection to the main surface . 2. The image display body, wherein the second portion does not include a metal layer, or includes a metal layer having a smaller film thickness than a metal layer included in the first portion. The information medium according to 1 or 2 . 4. The information medium according to claim 1 , wherein the second portion includes particulate metal in the image display body . 5. In the image display body, the first layer is obtained by irradiating only a part of a layer including a metal layer and exhibiting a structural color with an energy beam, and destroying the metal layer in the irradiated part. The information medium according to any one of claims 1 to 4 . The information medium according to claim 1 , wherein the third portion is transparent in the image display body . In the image display body, the resin is configured such that the visible light absorption rate is increased by irradiation of an energy beam, and the fourth portion is made of a substance obtained by irradiating the resin with the energy beam. The information medium according to any one of claims 1 to 6, further comprising:

Images