JP7518806B2 - Hologram laminate - Google Patents

Description

This disclosure relates to a hologram laminate.

A hologram is created by causing two beams of light with equal wavelengths (object beam and reference beam) to interfere with each other, and recording the wavefront of the object beam as interference fringes on a photosensitive material. When this hologram is exposed to light with the same conditions as the reference beam used to record the interference fringes, a diffraction phenomenon occurs due to the interference fringes, and a wavefront identical to the original object beam can be reproduced. Holograms have the advantages of being beautiful in appearance and relatively difficult to duplicate, and are therefore often used for security purposes, etc.

Holograms can be classified into several types depending on the recording format of the interference fringes, but the most common are relief holograms and volume holograms. A relief hologram has a fine uneven pattern imprinted on the surface of the hologram layer. On the other hand, a volume hologram has interference fringes created by the interference of light recorded three-dimensionally in the thickness direction as fringes with different refractive indexes. Volume holograms are more difficult to replicate than relief holograms, since the image is recorded due to the difference in refractive index of the material.

Volume holograms can be mass-produced industrially using a hologram master. Therefore, duplication is possible by using the volume hologram itself as the master, attaching a photosensitive material for duplication to the volume hologram, and irradiating a laser from the photosensitive material side.

Therefore, there is a demand for holograms that have excellent anti-counterfeiting properties.

For example, Patent Documents 1 and 2 disclose a hologram laminate in which a volume hologram and a relief hologram are laminated to enhance the anti-counterfeiting effect.

However, in recent years, technology for easily replicating holograms has become widespread, and it has been pointed out that simply using holograms is insufficient as a means of preventing counterfeiting.

Japanese Unexamined Patent Publication No. 6-118864 JP 2002-278434 A

This disclosure has been made in consideration of the above-mentioned circumstances, and its main objective is to provide a hologram laminate that is excellent in terms of anti-counterfeiting effect and design.

One embodiment of the present disclosure provides a hologram laminate having a volume hologram layer and a metal layer disposed on one side of the volume hologram layer and having a patterned light-transmitting portion and a light-reflecting portion.

The hologram laminate of this embodiment preferably has a relief hologram layer on the side of the metal layer opposite the volume hologram layer. In this case, the metal layer is preferably disposed on the uneven side of the relief hologram layer.

The hologram laminate of this embodiment may also have, on the surface of the volume hologram layer opposite the metal layer, an adhesive layer, a laser coloring layer having a patterned coloring portion, and a support, in that order from the volume hologram layer side.

Another embodiment of the present disclosure provides a hologram laminate having a relief hologram layer and a metal layer disposed on one side of the relief hologram layer and having dot-shaped light-transmitting and light-reflecting portions.

Another embodiment of the present disclosure provides a hologram laminate having a relief hologram layer and a metal layer disposed on one side of the relief hologram layer and having a pattern of light semi-transmitting portions and light reflective portions.

The hologram laminate of this embodiment preferably has a volume hologram layer on the side of the metal layer opposite the relief hologram layer.

Another embodiment of the present disclosure provides a card having the above-described hologram laminate.

Another embodiment of the present disclosure provides a hologram transfer foil having the above-described hologram laminate.

Another embodiment of the present disclosure provides a holographic label having the above-described holographic laminate.

Another embodiment of the present disclosure provides a data page having the above-described hologram laminate.

Another embodiment of the present disclosure provides a booklet having the above-mentioned data pages.

This disclosure provides a hologram laminate that has excellent anti-counterfeiting properties and design properties, and can also be used to add variable information.

1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a schematic cross-sectional view illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1A and 1B are schematic cross-sectional and plan views illustrating a hologram laminate according to the present disclosure. 1 is a photograph of a hologram laminate of Example 1.

Below, an embodiment of the present disclosure will be described with reference to the drawings. However, the present disclosure can be implemented in many different forms, and should not be interpreted as being limited to the description of the embodiment exemplified below. In addition, in order to make the explanation clearer, the drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual form, but these are merely examples and do not limit the interpretation of the present disclosure. In this specification and each figure, elements similar to those described above with respect to the previous figures are given the same reference numerals, and detailed explanations may be omitted as appropriate.

In this specification, when describing a mode in which another component is placed on a certain component, the term "above" or "below" is used, unless otherwise specified, to include both cases in which another component is placed directly above or below a certain component so as to be in contact with the component, and cases in which another component is placed above or below a certain component with another component in between. Also, in this specification, when describing a mode in which another component is placed on the surface of a certain component, the term "on the surface" is used, unless otherwise specified, to include both cases in which another component is placed directly above or below a certain component so as to be in contact with the component, and cases in which another component is placed above or below a certain component with another component in between.

In this specification, "sheet" also includes materials called "films." In addition, "films" also includes materials called "sheets."

The following provides a detailed explanation of the hologram laminate in this disclosure, as well as cards, hologram transfer foils, hologram labels, data pages, and booklets that use the same.

A. Hologram Laminate The hologram laminate in the present disclosure has three embodiments, which will be described below separately.

I. First Embodiment The hologram laminate of this embodiment has a volume hologram layer, and a metal layer disposed on one surface of the volume hologram layer and having patterned light-transmitting portions and light-reflecting portions.

The hologram laminate of this embodiment will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of the hologram laminate of this embodiment. As illustrated in FIG. 1, the hologram laminate 10 has a volume hologram layer 3 and a metal layer 6 arranged on one side of the volume hologram layer 3 and having a patterned light-transmitting portion 6a and a light-reflecting portion 6b. The hologram laminate 10 may further have any layer as necessary. In FIG. 1, a support 1, a first adhesive layer 2, a volume hologram layer 3, a first protective layer 4, a second adhesive layer 5, a metal layer 6, and a second substrate 7 are arranged in this order.

Here, in this specification, the "pattern" in the patterned light-transmitting portion refers to characters, figures, symbols, or combinations of these, as described below. Note that figures include, for example, simple figures such as polygons, circles, ellipses, and stars, as well as stripes, lattices, designs, bar codes, and two-dimensional codes.

2(a) and (b) are diagrams of the hologram laminate shown in FIG. 1 when observed, and FIG. 2(b) is a plan view of the hologram laminate 10 when observed from the surface of the second substrate 7 side in FIG. 2(a). As shown in FIG. 2(a) and (b), when a light source 22 is arranged on the observer 21 side and light is irradiated from the light source 22 to the hologram laminate 10 at an angle other than a predetermined angle, the metal layer 6 has a patterned light-transmitting portion 6a and a light-reflecting portion 6b, so that a predetermined pattern Ib due to the light-transmitting portion 6a can be observed due to the contrast of light brightness in the light-transmitting portion 6a and the light-reflecting portion 6b. Specifically, the metal layer 6 has a patterned light-transmitting portion 6a of the number "1", and when light is irradiated from the observer 21 side at an angle other than a predetermined angle, the pattern Ib of the number "1" due to the light-transmitting portion 6a of the metal layer 6 can be observed.

3(a) and (b) are views of the hologram laminate shown in FIG. 1, and FIG. 3(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 side in FIG. 3(a). As shown in FIG. 3(a), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with a reproduction illumination light from the light source 22 at a predetermined angle, an image is reproduced by the diffraction of light due to the interference fringes recorded in the volume hologram layer 3. At this time, the metal layer 6 has a pattern-shaped light transmitting portion 6a and a light reflecting portion 6b, and light can be transmitted through the light transmitting portion 6a. Therefore, as shown in FIG. 3(b), a predetermined pattern Ib due to the light transmitting portion 6a can be observed by the contrast of light brightness at the light transmitting portion 6a and the light reflecting portion 6b of the metal layer 6, and an image Ia reproduced in the volume hologram layer 3 can be observed in the light transmitting portion 6a of the metal layer 6. Specifically, the metal layer 6 has light-transmitting portions 6a in the pattern of the number "1." When the reconstruction illumination light is irradiated from the observer 21 at a predetermined angle, the pattern Ib of the number "1" formed by the light-transmitting portions 6a of the metal layer 6 can be observed, and the image Ia of a star reconstructed by the volume hologram layer 3 can be observed in the light-transmitting portions 6a of the metal layer 6.

In this embodiment, by disposing a metal layer having a patterned light-transmitting portion and a light-reflecting portion, a predetermined pattern due to the light-transmitting portion of the metal layer can be observed at angles other than the predetermined angle, while at the predetermined angle, a reproduced image of the volume hologram layer can be observed in the light-transmitting portion of the metal layer together with the predetermined pattern due to the light-transmitting portion of the metal layer. Therefore, the presence of the volume hologram layer can be made difficult to notice, and the anti-counterfeiting effect can be improved. In addition, the design can be improved. Furthermore, when the light-transmitting portion is formed in the metal layer by laser irradiation, for example, variable information such as a name, ID, serial number, barcode, two-dimensional code, etc. can be imparted to each hologram laminate by the patterned light-transmitting portion, and the hologram laminate can be used as a variable information recording medium.

Figure 4 is a schematic cross-sectional view showing another example of the hologram laminate of this embodiment. As illustrated in Figure 4, the hologram laminate 10 has a volume hologram layer 3 and a metal layer 6 arranged on one side of the volume hologram layer 3 and having a patterned light transmission portion 6a and a light reflection portion 6b, and a relief hologram layer 8 is arranged on the surface of the metal layer 6 opposite to the volume hologram layer 3. In addition, the hologram laminate 10 may further have any layer as necessary, and in Figure 4, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first protective layer 4, the second adhesive layer 5, the metal layer 6, the relief hologram layer 8, and the second substrate 7 are arranged in this order. In addition, the metal layer 6 is arranged on the surface of the relief hologram layer 8 on the uneven structure side, and can function as a reflective layer. In addition, in the metal layer 6, not only the light reflection portion 6b but also the light transmission portion 6a can function as a reflective layer.

5(a) and (b) are views of the hologram laminate shown in FIG. 4, and FIG. 5(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 side in FIG. 5(a). As shown in FIG. 5(a), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with a reproduction illumination light from the light source 22 at an angle other than a predetermined angle, an image is reproduced by the diffraction of light due to the interference fringes recorded in the relief hologram layer 8. At this time, since the metal layer 6 has a pattern-shaped light transmitting portion 6a and a light reflecting portion 6b, as shown in FIG. 5(b), a predetermined pattern Ib due to the light transmitting portion 6a can be observed by the contrast of light brightness at the light transmitting portion 6a and the light reflecting portion 6b of the metal layer 6, and an image Ic reproduced in the relief hologram layer 8 can be observed. Specifically, the metal layer 6 has a lattice-shaped light-transmitting portion 6a, and when the reconstruction illumination light is irradiated from the observer 21 side at an angle other than a predetermined angle, the lattice pattern Ib of the light-transmitting portion 6a of the metal layer 6 can be observed, and the image Ic of the letter "A" reproduced in the relief hologram layer 8 can be observed.

6(a) and (b) are views of the hologram laminate shown in FIG. 4, and FIG. 6(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 side in FIG. 6(a). As shown in FIG. 6(a), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with a reproduction illumination light from the light source 22 at a predetermined angle, an image is reproduced by the diffraction of light due to the interference fringes recorded in the volume hologram layer 3. At this time, as described above, the metal layer 6 has a pattern-shaped light transmission portion 6a and a light reflection portion 6b, and light can be transmitted through the light transmission portion 6a. Therefore, as shown in FIG. 6(b), a predetermined pattern Ib due to the light transmission portion 6a can be observed by the contrast of light brightness at the light transmission portion 6a and the light reflection portion 6b of the metal layer 6, and an image Ia reproduced in the volume hologram layer 3 can be observed in the light transmission portion 6a of the metal layer 6. Specifically, the metal layer 6 has a lattice-shaped light-transmitting portion 6a, and when the reconstruction illumination light is irradiated at a predetermined angle from the observer 21 side, the lattice pattern Ib of the light-transmitting portion 6a of the metal layer 6 can be observed, and the star image Ia reproduced in the volume hologram layer 3 can be observed in the light-transmitting portion 6a of the metal layer 6.

In this embodiment, when a relief hologram layer is disposed on the surface of the metal layer opposite the volume hologram layer, a reconstructed image of the relief hologram layer can be observed along with a predetermined pattern due to the light-transmitting portions of the metal layer at angles other than the predetermined angle, while a reconstructed image of the volume hologram layer can be observed in the light-transmitting portions of the metal layer along with a predetermined pattern due to the light-transmitting portions of the metal layer at the predetermined angle. This makes it even more difficult to notice the presence of the volume hologram layer, improving the anti-counterfeiting effect. Furthermore, the design can also be improved.

The following describes each component of the hologram laminate of this embodiment.

1. Metal Layer The metal layer in this embodiment is disposed on one surface of the volume hologram layer, and has a pattern of light-transmitting portions and light-reflecting portions.

The light-transmitting portion of the metal layer transmits light. In the light-transmitting portion of the metal layer, the spectral transmittance of a specific wavelength is, for example, preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more. By having the spectral transmittance of a specific wavelength in the light-transmitting portion within the above range, it becomes easier to observe the reproduced image of the volume hologram layer in the light-transmitting portion of the metal layer when the hologram laminate is irradiated with reproduction illumination light at a specified angle. It also becomes easier to observe the pattern due to the light-transmitting portion of the metal layer.

Here, the specific wavelength is the reproduction wavelength of the volume hologram layer, which is a part of the visible light range.

The spectral transmittance of a specific wavelength in the light-transmitting portion of the metal layer refers to the spectral transmittance of a specific wavelength in the region where the light-transmitting portion of the metal layer is located in a configuration in which the volume hologram layer is removed from the hologram laminate. For example, it is the spectral transmittance of a specific wavelength in the region where the light-transmitting portion of the metal layer is located in a laminate having a second substrate and a metal layer, or a laminate having a second substrate, a relief hologram layer, and a metal layer in this order.

The metal layer only needs to have a patterned light-transmitting portion, and the light-transmitting portions may be arranged in a pattern on the whole of the metal layer, or may be arranged in a pattern locally. For example, Figs. 5(a) and (b) are examples in which the light-transmitting portions 6a are arranged in a pattern on the whole of the metal layer 6, and Figs. 3(a) and (b) are examples in which the light-transmitting portions 6a are arranged in a pattern locally on the metal layer 6.

In addition, the ratio of the total area of the patterned light-transmitting portions to the area of the metal layer, i.e., the area ratio of the patterned light-transmitting portions, varies depending on the pattern shape of the light-transmitting portions, but is, for example, 0.5% to 50%, or 1% to 30%, or 5% to 25%. If the area ratio of the light-transmitting portions is too low, it may be difficult to observe the reproduced image of the volume hologram layer in the light-transmitting portions. In addition, if the area ratio of the light-transmitting portions is too high, the presence of the volume hologram layer may be easily noticeable.

The pattern shape of the light-transmitting portion in a planar view is not particularly limited as long as the reproduced image of the volume hologram layer can be observed in the light-transmitting portion, and examples include letters, figures, symbols, and combinations of these. Note that figures include simple figures such as polygons, circles, ellipses, and stars, as well as stripes, lattices, patterns, bar codes, and two-dimensional codes.

For example, if the light-transmitting portions in the metal layer are generally arranged in a striped or lattice pattern, the reconstructed image of the volume hologram layer can be observed on the entire metal layer by looking through the striped or lattice patterned light-transmitting portions. Also, for example, if the light-transmitting portions in the metal layer are arranged locally in a pattern of letters, figures, symbols, etc., the reconstructed image of the volume hologram layer can be observed on a part of the metal layer by looking through the light-transmitting portions in the pattern of letters, figures, symbols, etc.

In addition, the light-transmitting portion can be used to provide variable information, such as a name, ID, serial number, barcode, or two-dimensional code, to each hologram laminate, allowing the hologram laminate to be used as a variable information recording medium.

The line width of the light-transmitting portion is not particularly limited as long as the reproduced image of the volume hologram layer can be observed in the light-transmitting portion, and is appropriately selected depending on the pattern shape of the light-transmitting portion, etc.

For example, when the light transmitting portion is striped or lattice shaped, the line width of the light transmitting portion is 5 μm or more and 300 μm or less, or may be 10 μm or more and 100 μm or less, or may be 20 μm or more and 50 μm or less. If the line width of the light transmitting portion is too small, it may be difficult to observe the reproduced image of the volume hologram layer in the light transmitting portion, or it may be difficult to observe the pattern of the light transmitting portion. Furthermore, if the line width of the light transmitting portion is too large, the presence of the volume hologram layer may be easily noticeable.

For example, when the light-transmitting portion is striped or lattice-shaped, the stripe pitch or lattice spacing is 10 μm or more and 500 μm or less, or may be 30 μm or more and 400 μm or less, or may be 100 μm or more and 250 μm or less. If the stripe pitch or lattice spacing is too small, it may be difficult to observe the pattern of the light-transmitting portion or it may be difficult to form the pattern of the light-transmitting portion. If the stripe pitch or lattice spacing is too large, it may be difficult to observe the reproduced image of the volume hologram layer in the light-transmitting portion.

The dimensions of the light-transmitting portion can be measured by observing the surface of the hologram laminate using, for example, an optical microscope or a laser microscope.

The material of the metal layer is not particularly limited as long as it is a metal material that can form a light-transmitting portion in the metal layer by oxidizing or otherwise altering the surface of the metal layer or removing the metal layer by laser irradiation. In particular, the material of the metal layer is preferably a metal material that can oxidize or otherwise alter the surface of the metal layer by laser irradiation. Examples include aluminum, zinc, indium, tin, and titanium. Of these, aluminum is preferred. As described above, the metal layer can function as a reflective layer that is placed on the surface of the relief hologram layer on the concave-convex structure side, and an aluminum film is commonly used.

When a light-transmitting portion is formed in a metal layer by oxidizing or otherwise altering the surface of the metal layer, the light-transmitting portion is a portion of the metal layer surface that has been altered by oxidizing or otherwise altering the surface. In this case, the light-transmitting portion can have reflectivity, just like the light-reflecting portion.

The thickness of the metal layer is, for example, 5 nm to 1 μm, and may be 10 nm to 100 nm. If the metal layer is too thin, depending on the material of the metal layer, the spectral transmittance of a specific wavelength in the light-reflecting portion of the metal layer may be high, making the presence of the volume hologram layer easier to see. Also, if the metal layer is too thick, it may be difficult to form the light-transmitting portion.

As a method for forming the metal layer, for example, a method of forming a metal layer on one side of the second substrate and then forming a light-transmitting portion in the metal layer by laser irradiation can be mentioned. As a method for forming a metal layer on one side of the second substrate, for example, a vacuum deposition method, a sputtering method, etc. can be mentioned. In addition, as a method for forming a light-transmitting portion in the metal layer by laser irradiation, a general metal layer laser marking method can be applied.

As described below, when a support is disposed on the surface of the volume hologram layer opposite the metal layer, the metal layer may be disposed on the entire one surface of the support, or may be disposed on only a portion of the one surface of the support.

In addition, as described below, when a relief hologram layer is disposed on the surface of the metal layer opposite the volume hologram layer, the metal layer can also serve as a reflective layer that is disposed on the surface of the relief hologram layer facing the concave-convex structure.

2. Volume Hologram Layer In this embodiment, interference fringes are recorded in the volume hologram layer, and the interference fringes diffract light to reconstruct an image.

In this embodiment, the volume hologram layer is usually a reflection type volume hologram layer, a so-called Lippmann hologram. A reflection type volume hologram layer refers to a volume hologram layer that can reconstruct an image by irradiating the observer side of the volume hologram layer with reconstruction illumination light. In this embodiment, the hologram laminate is observed from the metal layer side, and the reconstructed image can be observed by irradiating the metal layer side of the hologram laminate with reconstruction illumination light.

The image reproduced from the interference fringes recorded in the volume hologram layer is not particularly limited and can be designed as appropriate.

The volume hologram layer may be transparent, translucent or opaque.

The material used for the volume hologram layer can be the same as the material used for a general volume hologram layer. Examples include curable resins such as thermosetting resins and ionizing radiation curable resins; thermoplastic resins; photosensitive materials such as silver salt materials, dichromated gelatin emulsions, photopolymerizable resins, photocrosslinkable resins, photoresists, photorefractive materials, and photochromic materials; etc.

The volume hologram layer may contain additives as necessary. The additives may be the same as those used in general volume hologram layers. Examples include sensitizing dyes, fine particles, thermal polymerization inhibitors, silane coupling agents, plasticizers, colorants, and binder resins.

The material preferably used for the volume hologram layer is a photosensitive material containing a binder resin, a photopolymerizable compound, a photopolymerization initiator, and a sensitizing dye, or a photosensitive material containing a cationic polymerizable compound, a radical polymerizable compound, a photoradical polymerization initiator, and a photocationic polymerization initiator.

As described below, when a support is disposed on the surface of the volume hologram layer opposite the metal layer, the volume hologram layer may be disposed on the entire one surface of the support, or may be disposed on a portion of the one surface of the support.

The volume hologram layer is arranged so as to overlap the metal layer in a planar view. Specifically, the image reproduced by the interference fringes recorded in the volume hologram layer is arranged so as to overlap the light-transmitting portion of the metal layer in a planar view. This makes it possible to make the presence of the volume hologram layer less noticeable when observing from the metal layer side of the hologram laminate, and also allows the reproduced image of the volume hologram layer to be observed in the light-transmitting portion of the metal layer, improving the anti-counterfeiting effect.

The volume hologram layer being arranged so as to overlap with the metal layer in a planar view means that at least a portion of the volume hologram layer overlaps with the metal layer in a planar view. Additionally, the volume hologram layer being arranged so that an image reproduced by interference fringes recorded in the volume hologram layer overlaps with the light transmitting portion of the metal layer in a planar view means that at least a portion of the image reproduced by interference fringes recorded in the volume hologram layer overlaps with the light transmitting portion of the metal layer in a planar view.

Furthermore, as described below, when a relief hologram layer is disposed on the surface of the metal layer opposite the volume hologram layer, the volume hologram layer may be disposed so as to overlap the relief hologram layer in a planar view, or may be disposed so as not to overlap the relief hologram layer in a planar view.

When the volume hologram layer is arranged so as to overlap the relief hologram layer in a planar view, specifically, the image reproduced from the interference fringes recorded in the volume hologram layer is arranged so as to overlap in a planar view with the image reproduced from the interference fringes recorded in the relief hologram layer. This makes it difficult to notice the presence of the volume hologram layer when observed from the relief hologram layer side of the hologram laminate, thereby improving the anti-counterfeiting effect.

In addition, when the volume hologram layer is arranged so as not to overlap with the relief hologram layer in a planar view, specifically, the image reconstructed from the interference fringes recorded in the volume hologram layer is arranged so as not to overlap with the image reconstructed from the interference fringes recorded in the relief hologram layer in a planar view. In this case, the reconstructed image of the volume hologram layer and the reconstructed image of the relief hologram layer may be designed to be combined to form a single image. The reconstructed image of the volume hologram layer and the reconstructed image of the relief hologram layer can form an integrated design.

Note that, "the volume hologram layer is arranged so as to overlap with the relief hologram layer in a planar view" means that at least a portion of the volume hologram layer overlaps with the relief hologram layer in a planar view. Furthermore, "the image reproduced by the interference fringes recorded in the volume hologram layer is arranged so as to overlap with the image reproduced by the interference fringes recorded in the relief hologram layer in a planar view" means that at least a portion of the image reproduced by the interference fringes recorded in the volume hologram layer overlaps with the image reproduced by the interference fringes recorded in the relief hologram layer in a planar view.

The thickness of the volume hologram layer is not particularly limited as long as it is thick enough to record the desired interference fringes, and is set appropriately depending on the application of the hologram laminate, the material of the volume hologram layer, etc. The specific thickness of the volume hologram layer can be the same as the thickness of a general volume hologram layer.

A method for forming a volume hologram layer includes, for example, a method in which object light and reference light having equal wavelengths interfere with each other on a volume hologram formation layer containing the above-mentioned material, thereby recording interference fringes. Specifically, a method for forming a reflective volume hologram layer includes a method in which object light is incident on one side of the volume hologram formation layer, and reference light is incident on the other side, thereby recording interference fringes.

3. Relief Hologram Layer In this embodiment, the relief hologram layer has a relief structure corresponding to interference fringes on its surface.

In this embodiment, when observing the pattern of the light-transmitting portion of the metal layer or the reproduced image of the volume hologram layer, a light source is placed on the surface of the hologram laminate facing the relief hologram layer, and observation is made from the surface facing the relief hologram layer, so the relief hologram layer is usually transparent. The transparency of the relief hologram layer can be the same as that of a general relief hologram layer, and can be adjusted as appropriate depending on the application of the hologram laminate.

The image reproduced from the interference fringes recorded in the relief hologram layer is not particularly limited and can be designed as appropriate.

The material used for the relief hologram layer can be the same as the material used for a general relief hologram layer. Examples include curable resins such as thermosetting resins and ionizing radiation curable resins; thermoplastic resins; photosensitive materials such as silver salt materials, dichromated gelatin emulsions, diazo-based photosensitive materials, photoresists, ferroelectrics, photochromic materials, thermochromic materials, and chalcogenide glass; etc.

The relief hologram layer may contain additives as necessary. The additives may be the same as those used in general relief hologram layers.

The shape of the relief hologram layer's relief structure may be any shape that allows the desired reproduced image to be produced, and can be determined appropriately in the same manner as the relief structure of a typical relief hologram layer.

In a relief hologram layer, a reflective layer is usually disposed on the surface of the relief hologram layer that faces the relief structure. By disposing a reflective layer on the surface of the relief hologram layer that faces the relief structure, the reflection and diffraction efficiency of the relief structure can be increased, and a reproduced image of the relief hologram layer with high brightness can be produced. Regarding the reflective layer, the above-mentioned metal layer may also serve as the reflective layer, or a transparent reflective layer may be disposed on the surface of the relief hologram layer that faces the relief structure in addition to the metal layer. The transparent reflective layer will be described later.

In addition, in this embodiment, since the hologram laminate is observed from the metal layer side, i.e., the relief hologram layer side, the relief hologram layer is positioned so that the surface with the concave-convex structure faces the metal layer and the surface opposite the concave-convex structure faces the observer and light source.

The thickness of the relief hologram layer is not particularly limited as long as it is thick enough to form a relief structure corresponding to the desired interference fringes, and is set appropriately depending on the application of the hologram laminate, the material of the relief hologram layer, etc. The specific thickness of the relief hologram layer can be the same as that of a general relief hologram layer.

Methods for forming a relief hologram layer include, for example, the embossing method and the 2P method.

4. Optional Configuration The hologram laminate of this embodiment may have an optional configuration as necessary, in addition to the volume hologram layer, metal layer, and relief hologram layer. The optional configuration is not particularly limited, and a configuration having a desired function can be used depending on the application and manufacturing method of the hologram laminate of this embodiment. Examples of the optional configuration include a support, a base material, a protective layer, an adhesive layer, a primer layer, a laser coloring layer, a transparent reflective layer, a hard coat layer, an antistatic layer, a printing layer, an ink receiving layer, a release layer, a colored layer, and a separator.

For example, as shown in FIG. 1, when a volume hologram transfer foil having a first adhesive layer 2, a volume hologram layer 3, and a first protective layer 4 in this order, and a metal label having a second adhesive layer 5, a metal layer 6, and a second substrate 7 in this order are used and the volume hologram transfer foil and the metal label are arranged on one side of a support 1 in this order, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first protective layer 4, the second adhesive layer 5, the metal layer 6, and the second substrate 7 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 7(a), when a volume hologram transfer foil having a first adhesive layer 2, a volume hologram layer 3, and a first protective layer 4 in this order, and a metal transfer foil having a second adhesive layer 5, a metal layer 6, and a second protective layer 9 in this order are used and the volume hologram transfer foil and the metal transfer foil are arranged on one side of the support 1 in this order, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first protective layer 4, the second adhesive layer 5, the metal layer 6, and the second protective layer 9 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 7(b), when a volume hologram label having a first adhesive layer 2, a volume hologram layer 3, and a first substrate 11 in this order, and a metal label having a second adhesive layer 5, a metal layer 6, and a second substrate 7 in this order are used and the volume hologram label and the metal label are arranged in this order on one side of the support 1, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first substrate 11, the second adhesive layer 5, the metal layer 6, and the second substrate 7 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 7(c), when a volume hologram sheet having a first adhesive layer 2, a volume hologram layer 3, and a first substrate 11 in this order, and a metal label having a second adhesive layer 5, a metal layer 6, and a second substrate 7 in this order, or a metal transfer foil having a second adhesive layer 5, a metal layer 6, and a second protective layer 9 in this order, is used to place the volume hologram sheet on one side of the support 1, and a metal label or metal transfer foil is placed on the side of the volume hologram sheet opposite the support 1 via a transparent sheet 14, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first substrate 11, the third adhesive layer 15, the transparent sheet 14, the second adhesive layer 5, the metal layer 6, and the second substrate 7 or the second protective layer 9 may be placed in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet and the transparent sheet 14 as an oversheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 4, when a volume hologram transfer foil having a first adhesive layer 2, a volume hologram layer 3, and a first protective layer 4 in this order, and a relief hologram label having a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 in this order are used, and the volume hologram transfer foil and the relief hologram label are arranged in this order on one side of the support 1, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first protective layer 4, the second adhesive layer 5, the metal layer 6, the relief hologram layer 8, and the second substrate 7 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 8(a), when a volume hologram transfer foil having a first adhesive layer 2, a volume hologram layer 3, and a first protective layer 4 in this order, and a relief hologram transfer foil having a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second protective layer 9 in this order are used and the volume hologram transfer foil and the relief hologram transfer foil are arranged in this order on one side of the support 1, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first protective layer 4, the second adhesive layer 5, the metal layer 6, the relief hologram layer 8, and the second protective layer 9 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

For example, as shown in FIG. 8(b), when a volume hologram label having a first adhesive layer 2, a volume hologram layer 3, and a first substrate 11 in this order, and a relief hologram label having a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 in this order are used, and the volume hologram label and the relief hologram label are arranged in this order on one side of the support 1, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first substrate 11, the second adhesive layer 5, the metal layer 6, the relief hologram layer 8, and the second substrate 7 may be arranged in this order in the hologram laminate 10. In this case, for example, by using the support 1 as a core sheet, the hologram laminate 10 can be used as an information recording medium such as a card.

8(c), for example, when a volume hologram sheet having a first adhesive layer 2, a volume hologram layer 3, and a first substrate 11 in this order, and a relief hologram label having a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 in this order, or a relief hologram transfer foil having a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second protective layer 9 in this order, is used to place the volume hologram sheet on one side of the support 1, and place the relief hologram label or the relief hologram transfer foil on the side of the volume hologram sheet opposite the support 1 via a transparent sheet 14, in the hologram laminate 10, the support 1, the first adhesive layer 2, the volume hologram layer 3, the first substrate 11, the third adhesive layer 15, the transparent sheet 14, the second adhesive layer 5, the metal layer 6, the relief hologram layer 8, and the second substrate 7 or the second protective layer 9 may be arranged in this order. In this case, for example, by using the support 1 as a core sheet and the transparent sheet 14 as an oversheet, the hologram laminate 10 can be used as an information recording medium such as a card.

Also, for example, as shown in FIG. 9(a), when the metal layer 6 and the volume hologram layer 3 are arranged in this order on one surface of the second substrate 7, the hologram laminate 10 may have the second substrate 7, the metal layer 6, the primer layer 12, the volume hologram layer 3, and the first adhesive layer 2 arranged in this order. In this case, the hologram laminate 10 can be used as, for example, a hologram transfer foil, a hologram label, or an embedded hologram sheet.

Also, for example, as shown in FIG. 9(b), when the relief hologram layer 8, the metal layer 6, and the volume hologram layer 3 are arranged in this order on one surface of the second substrate 7, the hologram laminate 10 may have the second substrate 7, the relief hologram layer 8, the metal layer 6, the primer layer 12, the volume hologram layer 3, and the first adhesive layer 2 arranged in this order. In this case, the hologram laminate 10 can be used, for example, as a hologram transfer foil, a hologram label, or an embedded hologram sheet.

The optional configurations are described below.

(1) Support The support in this embodiment is, for example, an adherend to which a volume hologram transfer foil or volume hologram label and a metal transfer foil or metal label are affixed, or an adherend to which a volume hologram transfer foil or volume hologram label and a relief hologram transfer foil or relief hologram label are affixed.

When the hologram laminate of this embodiment is used as a card, the support is the base member of the card, and is the core sheet. Examples of the core sheet include resin sheets such as polyethylene terephthalate (PET), amorphous polyethylene terephthalate (PET-G), polyvinyl chloride (PVC), and polycarbonate (PC). The core sheet may be made of, for example, a resin sheet, or may have a colored layer disposed on one side of the resin sheet. The outer shape of the core sheet is the same as the outer shape of the card.

The support may be transparent or opaque. The color of the support is not particularly limited and can be any color.

(2) First Substrate and Second Substrate In this embodiment, the first substrate is a member that supports a volume hologram layer in a volume hologram label when a hologram laminate is manufactured using the volume hologram label. The second substrate is a member that supports a metal layer or a relief hologram layer in a metal label or a relief hologram label when a hologram laminate is manufactured using a metal label or a relief hologram label. The second substrate may be a member that supports each layer when layers such as a relief hologram layer, a metal layer, and a volume hologram layer are formed in order on one side of the second substrate.

The first and second substrates are not particularly limited as long as they can support the volume hologram layer, metal layer, and relief hologram layer, and can be appropriately selected and used depending on the application of the hologram laminate.

A resin film can be used as the first substrate and the second substrate. Examples of resins that can be used to form the resin film include polyester resins such as polyethylene terephthalate, polycarbonate, acrylic resins, cycloolefin resins, polystyrene resins, and acrylic styrene resins.

The thickness of the first substrate and the second substrate is appropriately selected depending on the application and type of the hologram laminate, and is, for example, 2 μm or more and 200 μm or less, and preferably 10 μm or more and 50 μm or less.

The first and second substrates may be surface-treated to improve adhesion with the volume hologram layer, metal layer, and relief hologram layer. Examples of surface treatments include corona treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromate treatment, anchor or primer treatment, and the like. Examples of primers include various types of primers such as urethane-based, acrylic-based, ethylene-vinyl acetate copolymer-based, and vinyl chloride-vinyl acetate copolymer-based primers.

(3) First Protective Layer and Second Protective Layer In this embodiment, the first protective layer is a member that protects the volume hologram layer, and when a hologram laminate is manufactured using a volume hologram transfer foil, it maintains the physical strength, etc., of the transferred volume hologram layer. The second protective layer is a member that protects the metal layer and the relief hologram layer, and when a hologram laminate is manufactured using a metal transfer foil or a relief hologram transfer foil, it maintains the physical strength, etc., of the transferred metal layer and the relief hologram layer.

Materials used for the first and second protective layers include, for example, a mixture of one or more materials selected from the group consisting of acrylic resins, vinyl chloride-vinyl acetate copolymers, polyester resins, polymethacrylate resins, polyvinyl chloride resins, cellulose resins, silicone resins, chlorinated rubbers, casein, various surfactants, metal oxides, etc., as well as ionizing radiation curable resins, thermosetting resins, thermoplastic resins, etc. that react with ultraviolet rays, electron beams, etc.

The thickness of the first protective layer and the second protective layer can be, for example, about 0.5 μm or more and 5 μm or less.

(4) First adhesive layer and second adhesive layer In this embodiment, the first adhesive layer is a member for adhering the volume hologram layer to the support when a hologram laminate is manufactured using a volume hologram transfer foil or a volume hologram label. The first adhesive layer may also be a member for adhering a laminate composed of layers such as a relief hologram layer, a metal layer, and a volume hologram layer to the support when these layers are formed in order on one side of the second substrate. The second adhesive layer is a member for adhering the metal layer or the relief hologram layer to the volume hologram layer when a hologram laminate is manufactured using a metal transfer foil or a metal label, or a relief hologram transfer foil or a relief hologram label.

When manufacturing a hologram laminate using a volume hologram transfer foil, a metal transfer foil, or a relief hologram transfer foil, a heat sealant is used as the adhesive that constitutes the first adhesive layer and the second adhesive layer.

The heat sealing agent contains a thermoplastic resin. There are no particular limitations on the thermoplastic resin, and it is selected appropriately depending on the type of material to be bonded. Examples of thermoplastic resins include maleic acid modified vinyl chloride-vinyl acetate copolymers, ethylene-vinyl acetate copolymers, vinyl chloride-vinyl acetate copolymers, polyamide resins, polyester resins, polyethylene resins, ethylene-isobutyl acrylate copolymers, butyral resins, polyvinyl acetate and copolymers thereof, ionomer resins, acid modified polyolefin resins, (meth)acrylic resins such as acrylic and methacrylic resins, acrylic acid ester resins, ethylene-(meth)acrylic acid copolymers, ethylene-(meth)acrylic acid ester copolymers, polymethyl methacrylate resins, cellulose resins, polyvinyl ether resins, polyurethane resins, polycarbonate resins, polypropylene resins, epoxy resins, phenolic resins, vinyl resins, maleic acid resins, alkyd resins, polyethylene oxide resins, urea resins, melamine resins, melamine-alkyd resins, silicone resins, rubber resins, styrene butadiene styrene block copolymers (SBS), styrene isoprene styrene block copolymers (SIS), styrene ethylene butylene styrene block copolymers (SEBS), styrene ethylene propylene styrene block copolymers (SEPS), and the like. The thermoplastic resin may be used alone or in combination of two or more types.

The heat sealant may contain additives. Examples of additives include dispersants, fillers, plasticizers, and antistatic agents.

When a hologram laminate is manufactured using a volume hologram transfer foil, a metal transfer foil, or a relief hologram transfer foil, the thickness of the first adhesive layer and the second adhesive layer is not particularly limited and is appropriately selected depending on the type of members to be bonded, and is preferably 0.3 μm or more and 50 μm or less, and more preferably 0.5 μm or more and 25 μm or less. If the thickness of the first adhesive layer and the second adhesive layer is too thin, the adhesion may be insufficient. Furthermore, if the thickness of the first adhesive layer and the second adhesive layer is too thick, the heating temperature during transfer may become too high, causing damage to other members.

When a heat sealing agent is used for the first adhesive layer and the second adhesive layer, the first adhesive layer and the second adhesive layer may be a single layer or may be a multilayer. In the case of a multilayer, layers of the same composition may be laminated, or layers of different compositions may be laminated.

When manufacturing a hologram laminate using a volume hologram label, a metal label, or a relief hologram label, examples of adhesives that make up the first adhesive layer and the second adhesive layer include heat sealants and pressure-sensitive adhesives.

Heat sealants have been described above, so we will not explain them here.

Examples of pressure-sensitive adhesives include acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, and polyester adhesives. Of these, it is preferable to use acrylic adhesives, which have excellent durability and adhesion and are low cost. The pressure-sensitive adhesive may be a solvent-based adhesive or a solventless adhesive. As the solventless adhesive, a photosensitive adhesive may be used.

Acrylic adhesives are based on acrylic resins, with crosslinkers, tackifiers, etc. added as needed.

Various additives such as antioxidants and ultraviolet absorbers may be added to the pressure-sensitive adhesive as long as they do not impair its performance. In addition, when using a photosensitive adhesive that cures when exposed to ultraviolet or visible light, a polymerization initiator is added. In addition, when using a photosensitive adhesive that cures when exposed to electron beams, no polymerization initiator is added.

When manufacturing a hologram laminate using a volume hologram label, a metal label, or a relief hologram label, the thickness of the first adhesive layer and the second adhesive layer is, for example, 4 μm or more and 200 μm or less, and preferably 5 μm or more and 100 μm or less.

(5) Laser coloring layer In this embodiment, as shown in FIG. 10(a) and (b), for example, a laser coloring layer 13 having a patterned coloring portion 12a may be disposed between the support 1 and the volume hologram layer 3. The laser coloring layer is a member that develops color by laser irradiation and has a patterned coloring portion. When forming a light transmitting portion in the metal layer by laser irradiation, a coloring portion can be formed in the laser coloring layer at the same time. In this case, the pattern of the light transmitting portion of the metal layer and the pattern of the coloring portion of the laser coloring layer become the same, and the visibility of the reproduced image of the volume hologram layer in the light transmitting portion of the metal layer and the visibility of the pattern of the light transmitting portion of the metal layer can be improved. In addition, since the metal layer tends to become brittle due to heat caused by laser irradiation, when the volume hologram layer is peeled off from the support, the metal layer is easily cohesively broken, or is easily peeled off between the metal layer and the primer layer, and the volume hologram layer and the laser coloring layer remain on the support side. Therefore, the counterfeit prevention effect can be improved.

The laser coloring layer may contain a binder resin and a laser coloring agent.

Examples of binder resins include polyolefin resins, vinyl resins, polyester resins, polyamide resins, acrylic resins, and phenolic resins.

Examples of laser coloring agents include colorants such as dyes and pigments, and clays.

The laser coloring layer may also contain additives as necessary.

The thickness of the laser coloring layer is, for example, 0.2 μm or more and 200 μm or less, or may be 1 μm or more and 150 μm or less, or 20 μm or more and 100 μm or less.

As a method for forming the laser coloring layer, for example, a method of applying a resin composition containing a binder resin and a laser coloring agent to one side of the support can be mentioned. In addition, as a method for forming a coloring portion in the laser coloring layer, laser irradiation can be mentioned. In this embodiment, by laser irradiation, a light transmitting portion can be formed in the metal layer and at the same time a coloring portion can be formed in the laser coloring layer.

(6) Transparent Reflective Layer In this embodiment, a transparent reflective layer may be disposed between the metal layer and the relief hologram layer on the surface of the relief hologram layer facing the concave-convex structure.

As the transparent reflective layer, for example, a transparent metal reflective layer or a transparent resin reflective layer described in JP-A-2013-014081 and JP-A-2014-02646 can be used.

5. Use of the hologram laminate The hologram laminate of this embodiment may be used as an information recording medium such as a card, or may be used as a hologram transfer foil, a hologram label, or an embedded hologram sheet. The hologram laminate may also be used as a data page. The cards, hologram transfer foil, hologram label, and data page will be described later.

6. Manufacturing Method of Hologram Laminate The manufacturing method of the hologram laminate of this embodiment is not particularly limited as long as it is a method capable of manufacturing the above-mentioned hologram laminate, and may be the same as a manufacturing method of a general hologram laminate.

For example, a volume hologram transfer foil or volume hologram label and a metal transfer foil or metal label may be used, the volume hologram transfer foil or volume hologram label may be affixed to a support, and then the metal transfer foil or metal label may be affixed to the volume hologram transfer foil or volume hologram label. Also, for example, a volume hologram transfer foil or volume hologram label and a relief hologram transfer foil or relief hologram label may be used, the volume hologram transfer foil or volume hologram label may be affixed to a support, and then the relief hologram transfer foil or relief hologram label may be affixed to the volume hologram transfer foil or volume hologram label.

In addition, layers such as a relief hologram layer, a metal layer, and a volume hologram layer may be formed in sequence on the second substrate.

For example, a volume hologram layer, a metal layer, and a relief hologram layer can be arranged on a support to obtain a laminate, and then a laser can be irradiated onto the laminate to form a light-transmitting portion in the metal layer. Alternatively, a metal transfer foil, a metal label, a relief hologram transfer foil, or a relief hologram label can be prepared in advance, irradiated with a laser to form a light-transmitting portion in the metal layer, and then attached onto the support.

II. Second Embodiment The hologram laminate of this embodiment has a relief hologram layer and a metal layer disposed on one surface of the relief hologram layer and having dot-shaped light-transmitting portions and light-reflecting portions.

The hologram laminate of this embodiment will be described with reference to the drawings. FIG. 11 is a schematic cross-sectional view showing an example of the hologram laminate of this embodiment. As illustrated in FIG. 11, the hologram laminate 10 has a relief hologram layer 8 and a metal layer 6 arranged on one side of the relief hologram layer 8 and having dot-shaped light-transmitting portions 6a and light-reflecting portions 6b. The hologram laminate 10 may further have any layer as necessary, and in FIG. 11, a support 1, a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 are arranged in this order. The metal layer 6 is arranged on the surface of the relief hologram layer 8 on the uneven structure side, and can function as a reflective layer. In the metal layer 6, not only the light-reflecting portions 6b but also the light-transmitting portions 6a can function as a reflective layer.

12(a) and (b) are views of the hologram laminate shown in FIG. 11, and FIG. 12(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 in FIG. 12(a). As shown in FIGS. 12(a) and (b), when a light source 22 is disposed on the observer 21 side and the hologram laminate 10 is irradiated with a reproduction illumination light from the light source 22, an image Ic is reproduced by the diffraction of light due to the interference fringes recorded in the relief hologram layer 8. Specifically, when the reproduction illumination light is irradiated from the observer 21 side, the image Ic of the letter "A" reproduced in the relief hologram layer 8 can be observed. At this time, as shown in FIG. 13(c) described later, since the metal layer 6 has fine dot-shaped light transmitting portions 6a, the pattern due to the fine dot-shaped light transmitting portions 6a cannot be visually observed even when light is irradiated from the observer 21 side.

13(a)-(c) are views of the hologram laminate shown in FIG. 11, FIG. 13(b) is a plan view of the hologram laminate 10 in FIG. 13(a) when observed from the surface of the second substrate 7 side, and FIG. 13(c) is an enlarged view of part A in FIG. 13(b). As shown in FIG. 13(a)-(c), when a light source 22 is disposed on the side opposite the observer 21 and light is irradiated from the light source 22 to the hologram laminate 10, a predetermined pattern Ib of fine dot-shaped light-transmitting portions 6a can be observed by the light transmitted through the light-transmitting portions 6a of the metal layer 6. Specifically, when light is irradiated from the side opposite the observer 21, a pattern Ib of the number "1" can be observed by the fine dot-shaped light-transmitting portions 6a of the metal layer 6.

In this embodiment, since the metal layer having the fine dot-shaped light transmitting portions and light reflecting portions is arranged, the pattern of the fine dot-shaped light transmitting portions of the metal layer can be observed by looking through the hologram laminate. Therefore, when light is irradiated from the observer side, the reproduced image of the relief hologram layer can be observed, while when light is irradiated from the opposite side to the observer, the pattern of the fine dot-shaped light transmitting portions of the metal layer can be observed. Therefore, the relief hologram layer can make the presence of the dot-shaped light transmitting portions of the metal layer difficult to notice, and the counterfeit prevention effect can be improved. In addition, the design can be improved. Furthermore, when the light transmitting portions are formed in the metal layer by, for example, laser irradiation, the fine dot-shaped light transmitting portions can impart variable information such as, for example, a name, an ID, a serial number, a bar code, a two-dimensional code, etc. to each hologram laminate, and the hologram laminate can be used as a variable information recording medium.

Figure 14 is a schematic cross-sectional view showing another example of the hologram laminate of this embodiment. As illustrated in Figure 14, the hologram laminate 10 has a volume hologram layer 3 and a metal layer 6 arranged on one surface of the volume hologram layer 3 and having a patterned light-transmitting portion 6a and a light-reflecting portion 6b. The hologram laminate 10 may further have any layer as necessary, and in Figure 14, a support 1, a first adhesive layer 2, a volume hologram layer 3, a first protective layer 4, a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 are arranged in this order. The metal layer 6 is arranged on the surface of the relief hologram layer 8 on the uneven structure side, and can function as a reflective layer.

15(a) and (b) are views of the hologram laminate shown in FIG. 14, and FIG. 15(b) is a plan view of the hologram laminate 10 in FIG. 15(a) when observed from the surface of the second substrate 7 side. As shown in FIG. 15(a) and (b), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with reconstruction illumination light from the light source 22, an image Ic is reproduced by diffraction of light due to interference fringes recorded in the relief hologram layer 8. Specifically, when the reconstruction illumination light is irradiated from the observer 21 side, the image Ic of the letter "A" reproduced in the relief hologram layer 8 can be observed. At this time, as shown in FIG. 16(c) described later, since the metal layer 6 has fine dot-shaped light transmitting portions 6a, even if light is irradiated from the observer 21 side, the pattern due to the fine dot-shaped light transmitting portions 6a cannot be visually observed.

16(a)-(c) are views of the hologram laminate shown in FIG. 14, FIG. 16(b) is a plan view of the hologram laminate 10 in FIG. 16(a) when observed from the surface of the second substrate 7 side, and FIG. 16(c) is an enlarged view of part A in FIG. 16(b). As shown in FIG. 16(a)-(c), when a light source 22 is disposed on the side opposite the observer 21 and light is irradiated from the light source 22 to the hologram laminate 10, a predetermined pattern Ib of fine dot-shaped light transmission parts 6a can be observed by the light transmitted through the light transmission parts 6a of the metal layer 6. Specifically, when light is irradiated from the side opposite the observer 21, a pattern Ib of the number "1" can be observed by the fine dot-shaped light transmission parts 6a of the metal layer 6.

17(a) and (b) are views of the hologram laminate shown in FIG. 14, and FIG. 17(b) is a plan view of the hologram laminate 10 in FIG. 17(a) when observed from the surface of the support 1 side. As shown in FIG. 17(a) and (b), when a light source 22 is arranged on the observer 21 side and a reproduction illumination light is irradiated from the light source 22 to the hologram laminate 10 at a predetermined angle, an image Ia is reproduced by the diffraction of light due to the interference fringes recorded in the volume hologram layer 3. Specifically, when the reproduction illumination light is irradiated from the observer 21 side, the star image Ia reproduced in the volume hologram layer 3 can be observed. At this time, as shown in FIG. 16(c) above, since the metal layer 6 has fine dot-shaped light transmitting parts 6a, even if light is irradiated from the observer 21 side, the pattern due to the fine dot-shaped light transmitting parts 6a cannot be visually observed.

In this embodiment, when a volume hologram layer is disposed on the surface of the metal layer opposite the relief hologram layer, a reconstructed image of the volume hologram layer can be observed in the light-transmitting portion of the reflective layer at a predetermined angle, and when observed from the relief hologram layer side, the reconstructed image of the relief hologram layer can be observed, while when observed from the volume hologram layer side, the reconstructed image of the volume hologram layer can be observed, and when observed through the hologram laminate, a pattern of fine dot-shaped light-transmitting portions of the metal layer can be observed. This improves the anti-counterfeiting effect. Furthermore, the design can also be improved.

In this embodiment, the configuration other than the metal layer and the support can be the same as in the first embodiment described above.

The metal layer and support in the hologram laminate of this embodiment are described below.

1. Metal Layer The metal layer in this embodiment is disposed on one surface of the volume hologram layer, and has dot-shaped light-transmitting portions and light-reflecting portions.

The metal layer only needs to have dot-shaped light-transmitting portions, and the dots may be dots generated by halftone processing, for example, or may be dots generated by an error diffusion method. In the case of halftone processing, the gradation can be expressed by the size of the dots, and the density of the dots is constant. On the other hand, in the case of error diffusion, the gradation can be expressed by the density of the dots, and the size of the dots is constant.

The size of the dots is, for example, 5 μm or more and 400 μm or less, or may be 10 μm or more and 200 μm or less, or 20 μm or more and 150 μm or less. If the dot size is too small, it may be difficult to observe the pattern due to the dot-shaped light-transmitting portions. Also, if the dot size is too large, the presence of the light-transmitting portions may be easily noticeable.

In addition, the ratio of the total area of the dot-shaped light-transmitting portions to the area of the metal layer, i.e., the area ratio of the dot-shaped light-transmitting portions, is, for example, 0.5% to 50%, and may be 1% to 30%, or 5% to 25%. If the area ratio of the light-transmitting portions is too small, it may be difficult to observe the pattern formed by the dot-shaped light-transmitting portions. In addition, if the area ratio of the light-transmitting portions is too large, the presence of the light-transmitting portions may be easily noticeable.

Examples of patterns that can be expressed by the dot-shaped light-transmitting portions include patterns of letters, figures, symbols, or combinations of these, as well as photographic patterns such as portraits and landscape photographs.

In addition, the pattern expressed by the dot-shaped light-transmitting portions can be used to impart variable information, such as a name, ID, facial photograph, serial number, barcode, two-dimensional code, etc., to each hologram laminate, allowing the hologram laminate to be used as a variable information recording medium.

The material, thickness, formation method, arrangement, etc. of the metal layer can be the same as in the first embodiment above.

2. Support In this embodiment, the support is transparent because the pattern of the dot-like light-transmitting portions of the metal layer can be observed by looking through the hologram laminate.

Other aspects of the support can be the same as in the first embodiment above.

III. Third Embodiment The hologram laminate of this embodiment has a relief hologram layer and a metal layer disposed on one surface of the relief hologram layer and having a pattern of semi-light-transmitting portions and light-reflecting portions.

The hologram laminate of this embodiment will be described with reference to the drawings. FIG. 18 is a schematic cross-sectional view showing an example of the hologram laminate of this embodiment. As illustrated in FIG. 18, the hologram laminate 10 has a relief hologram layer 8 and a metal layer 6 arranged on one side of the relief hologram layer 8 and having a patterned light semi-transmitting portion 6c and a light reflecting portion 6b. The hologram laminate 10 may further have any layer as necessary, and in FIG. 18, a support 1, a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 are arranged in this order. The metal layer 6 is arranged on the surface of the relief hologram layer 8 on the uneven structure side, and can function as a reflective layer. In the metal layer 6, not only the light reflecting portion 6b but also the light semi-transmitting portion 6c can function as a reflective layer.

19(a) and (b) are diagrams of the hologram laminate shown in FIG. 18 when observed, and FIG. 19(b) is a plan view of the hologram laminate 10 when observed from the surface of the second substrate 7 side in FIG. 19(a). As shown in FIG. 19(a) and (b), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with a reproduction illumination light from the light source 22, an image Ic is reproduced by the diffraction of light due to the interference fringes recorded in the relief hologram layer 8. Specifically, when the reproduction illumination light is irradiated from the observer 21 side, the image Ic of the letter "A" reproduced in the relief hologram layer 8 can be observed. At this time, the metal layer 6 has a pattern-shaped light semi-transmitting portion 6c and a light reflecting portion 6b, and since the difference in optical properties between the light semi-transmitting portion 6c and the light reflecting portion 6b is small, the pattern by the pattern-shaped light semi-transmitting portion 6c cannot be visually observed even when light is irradiated from the observer 21 side.

20(a) and (b) are views of the hologram laminate shown in FIG. 18, and FIG. 20(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 side in FIG. 20(a). As shown in FIG. 20(a) and (b), when a light source 22 is disposed on the side opposite the observer 21 and light is irradiated from the light source 22 to the hologram laminate 10, a predetermined pattern Id due to the patterned light semi-transmitting portions 6b can be observed by the light that has passed through the light semi-transmitting portions 6c of the metal layer 6. Specifically, when light is irradiated from the side opposite the observer 21, a pattern Id of the number "1" due to the patterned light semi-transmitting portions 6c of the metal layer 6 can be observed.

In this embodiment, since the metal layer having the patterned light semi-transmitting portions and the light reflecting portions is arranged, the pattern due to the patterned light semi-transmitting portions of the metal layer can be observed by looking through the hologram laminate. Therefore, when light is irradiated from the observer side, the reproduced image of the relief hologram layer can be observed, while when light is irradiated from the opposite side to the observer, the pattern due to the patterned light semi-transmitting portions of the metal layer can be observed. Therefore, the relief hologram layer can make the presence of the patterned light semi-transmitting portions of the metal layer difficult to notice, and the counterfeit prevention effect can be improved. In addition, the design can be improved. Furthermore, when the light semi-transmitting portions are formed in the metal layer by, for example, laser irradiation, the patterned light transmitting portions can impart variable information such as, for example, a name, an ID, a serial number, a barcode, a two-dimensional code, etc., to each hologram laminate, and the hologram laminate can be used as a variable information recording medium.

Figure 21 is a schematic cross-sectional view showing another example of the hologram laminate of this embodiment. As illustrated in Figure 14, the hologram laminate 10 has a volume hologram layer 3 and a metal layer 6 arranged on one surface of the volume hologram layer 3 and having a patterned light semi-transmitting portion 6c and a light reflecting portion 6b. The hologram laminate 10 may further have any layer as necessary, and in Figure 21, a support 1, a first adhesive layer 2, a volume hologram layer 3, a first protective layer 4, a second adhesive layer 5, a metal layer 6, a relief hologram layer 8, and a second substrate 7 are arranged in this order. The metal layer 6 is arranged on the surface of the relief hologram layer 8 on the uneven structure side, and can function as a reflective layer.

22(a) and (b) are diagrams of the hologram laminate shown in FIG. 21 when observed, and FIG. 22(b) is a plan view of the hologram laminate 10 when observed from the surface of the second substrate 7 side in FIG. 22(a). As shown in FIG. 22(a) and (b), when a light source 22 is arranged on the observer 21 side and the hologram laminate 10 is irradiated with reproduction illumination light from the light source 22, an image Ic is reproduced by diffraction of light due to interference fringes recorded in the relief hologram layer 8. Specifically, when the reproduction illumination light is irradiated from the observer 21 side, the image Ic of the letter "A" reproduced in the relief hologram layer 8 can be observed. At this time, the metal layer 6 has a pattern-shaped light semi-transmitting portion 6c and a light reflecting portion 6b, and since the difference in optical properties between the light semi-transmitting portion 6c and the light reflecting portion 6b is small, the pattern by the pattern-shaped light semi-transmitting portion 6c cannot be visually observed even when light is irradiated from the observer 21 side.

23(a) and (b) are views of the hologram laminate shown in FIG. 21, and FIG. 23(b) is a plan view of the hologram laminate 10 as viewed from the surface of the second substrate 7 side in FIG. 23(a). As shown in FIG. 23(a) and (b), when a light source 22 is disposed on the side opposite the observer 21 and light is irradiated from the light source 22 to the hologram laminate 10, a predetermined pattern Id due to the patterned light semi-transmitting portions 6c of the metal layer 6 can be observed by the light that has passed through the light semi-transmitting portions 6c of the metal layer 6. Specifically, when light is irradiated from the side opposite the observer 21, a pattern Id of the number "1" due to the patterned light semi-transmitting portions 6c of the metal layer 6 can be observed.

24(a) and (b) are diagrams of the hologram laminate shown in FIG. 21 when observed, and FIG. 24(b) is a plan view of the hologram laminate 10 when observed from the surface of the support 1 side in FIG. 24(a). As shown in FIG. 24(a) and (b), when a light source 22 is arranged on the observer 21 side and a reproduction illumination light is irradiated from the light source 22 to the hologram laminate 10 at a predetermined angle, an image Ia is reproduced by the diffraction of light due to the interference fringes recorded in the volume hologram layer 3. Specifically, when the reproduction illumination light is irradiated from the observer 21 side, the image Ia of a star reproduced in the volume hologram layer 3 can be observed. At this time, the metal layer 6 has a pattern-shaped light semi-transmitting portion 6c and a light reflecting portion 6b, and since the difference in optical properties between the light semi-transmitting portion 6c and the light reflecting portion 6b is small, even if light is irradiated from the observer 21 side, the pattern by the pattern-shaped light semi-transmitting portion 6c cannot be visually observed.

In this embodiment, when a volume hologram layer is disposed on the surface of the metal layer opposite the relief hologram layer, a reconstructed image of the relief hologram layer can be observed when light is irradiated from the relief hologram layer side and observed, while a reconstructed image of the volume hologram layer can be observed when light is irradiated from the volume hologram layer side and observed, and a pattern due to the patterned light semi-transmitting parts of the metal layer can be observed when observed through the hologram laminate. This improves the anti-counterfeiting effect. Furthermore, the design can also be improved.

In this embodiment, the configuration other than the metal layer and the support can be the same as in the first embodiment described above.

The metal layer and support in the hologram laminate of this embodiment are described below.

1. Metal Layer The metal layer in this embodiment is disposed on one surface of the volume hologram layer, and has a pattern of light semi-transmitting portions and light reflective portions.

The light semi-transmitting portion of the metal layer transmits light. In the light semi-transmitting portion of the metal layer, the spectral transmittance of a specific wavelength is, for example, preferably 10% to 75%, more preferably 20% to 60%, and even more preferably 30% to 50%. By having the spectral transmittance of a specific wavelength in the light semi-transmitting portion within the above range, it is possible to make it difficult to observe the pattern due to the light semi-transmitting portion when light is irradiated from the observer side, while making it easy to observe the pattern due to the light semi-transmitting portion when light is irradiated from the opposite side to the observer.

The spectral transmittance of a specific wavelength in the semi-transparent portion of the metal layer refers to the spectral transmittance of a specific wavelength in the region where the semi-transparent portion of the metal layer is located in a configuration in which the volume hologram layer is removed from the hologram laminate. For example, in a laminate having a second substrate, a relief hologram layer, and a metal layer in this order, it is the spectral transmittance of a specific wavelength in the region where the semi-transparent portion of the metal layer is located.

In the metal layer, the arrangement of the semi-transmitting portions, the area ratio of the semi-transmitting portions, the pattern shape of the semi-transmitting portions in a planar view, etc. can be the same as the light-transmitting portions of the metal layer in the first embodiment described above.

The line width of the semi-transmitting portion is not particularly limited as long as the pattern formed by the semi-transmitting portion is difficult to observe when light is irradiated from the observer side, but the pattern formed by the semi-transmitting portion can be observed when light is irradiated from the opposite side to the observer, and is appropriately selected according to the pattern shape of the semi-transmitting portion, etc.

For example, when the semi-transmitting portion has a stripe or lattice pattern, the line width of the semi-transmitting portion is 5 μm or more and 300 μm or less, or may be 10 μm or more and 100 μm or less, or may be 20 μm or more and 50 μm or less. If the line width of the semi-transmitting portion is too small, it may be difficult to observe the pattern of the semi-transmitting portion when light is irradiated from the side opposite the observer. Also, if the line width of the semi-transmitting portion is too large, the presence of the semi-transmitting portion may be easily noticeable when light is irradiated from the observer side.

The dimensions of the light-semitransmitting portion can be measured by observing the surface of the hologram laminate using, for example, an optical microscope or a laser microscope.

The material, thickness, arrangement, etc. of the metal layer can be the same as in the first embodiment above.

When a semi-light-transmitting portion is formed in a metal layer by oxidizing or otherwise altering the surface of the metal layer, the semi-light-transmitting portion is a portion of the metal layer surface that has been altered by oxidation or otherwise alteration. In this case, the semi-light-transmitting portion can have reflectivity, similar to the light-reflecting portion.

For example, a method for forming the metal layer includes forming a metal layer on one side of the second substrate, and then forming a light semi-transmitting portion in the metal layer by laser irradiation. The method for forming the metal layer on one side of the second substrate can be the same as that of the first embodiment. In addition, a general method for laser marking of metal layers can be applied as a method for forming a light semi-transmitting portion in the metal layer by laser irradiation. In this case, the optical properties of the light semi-transmitting portion can be controlled by adjusting the output of the laser. Specifically, when the output of the laser is low, the spectral transmittance of a specific wavelength in the light semi-transmitting portion tends to be low.

2. Support In this embodiment, the support is transparent because the pattern due to the patterned light semi-transmitting portions of the metal layer can be observed by looking through the hologram laminate.

Other aspects of the support can be the same as in the first embodiment above.

B. Cards The cards in this disclosure have the holographic laminate described above.

In the present disclosure, the hologram laminate may be used as a card. In addition, when the hologram laminate is a hologram transfer foil, a hologram label, or an embedding hologram sheet, the hologram laminate can be disposed on one side of a core sheet.

When the hologram laminate is used as a card, it can be configured as shown in, for example, the above-mentioned Figures 7(a)-(c) and Figures 8(a)-(c). In Figures 7(a), (b) and Figures 8(a), (b), the support 1 can be a core sheet, and although not shown, a transparent sheet (over sheet) can be placed on one side of the support so as to cover the metal layer 6, the relief hologram layer 8, etc. Also, in Figures 7(c) and 8(c), the support 1 can be a core sheet and the transparent sheet 14 can be an over sheet.

When the hologram laminate is a hologram transfer foil, a hologram label, or an embedded hologram sheet, it can be configured as shown in Figs. 9(a) and (b) above. In a card, the hologram laminate can be disposed on one side of a core sheet.

The transparent sheet is a member that protects the volume hologram layer, the metal layer, and the relief hologram layer. In addition, when the transparent sheet is placed on the outermost surface of the information recording medium, it can function as an oversheet that protects the surface of the information recording medium.

The transparent sheet may be any sheet having transparency, such as a resin sheet made of polyethylene terephthalate (PET), amorphous polyethylene terephthalate (PET-G), polyvinyl chloride (PVC), polycarbonate (PC), etc. The surface of the transparent sheet may be, for example, mirror-like or matte. The outer shape of the transparent sheet is the same as the outer shape of the card.

When the hologram laminate is used as a card, the hologram laminate may have any configuration as necessary. The optional configuration may be selected from a configuration having the desired function depending on the application of the card. Examples of the optional configuration include a third adhesive layer, a printing layer, an intermediate sheet, an oversheet, an interlayer adhesive layer, an IC module including an IC chip, an inlet including an IC chip and an antenna, a magnetic stripe, etc.

For example, although not shown in Figures 7(a)-(b) and 8(a)-(b), when a transparent sheet is disposed on one side of the support 1 so as to cover the second protective layer 9 or the second substrate 7, a third adhesive layer may be disposed between the transparent sheet and the second protective layer 9 or the second substrate 7. An example of an adhesive constituting the third adhesive layer is a heat sealant. The heat sealant is as described above.

Examples of cards include various IC cards, driver's licenses, insurance cards, employee ID cards, membership cards, student ID cards and other ID cards, credit cards, debit cards, cash cards, card keys, point cards, prepaid cards, etc.

C. Hologram Transfer Foil The hologram transfer foil in the present disclosure has the above-mentioned hologram laminate. In the present disclosure, the hologram laminate can be used as the hologram transfer foil.

When the hologram laminate is used as a hologram transfer foil, it can be configured as shown in Figs. 9(a) and (b) above. In this case, although not shown, a separator may be disposed on the surface of the first adhesive layer opposite the volume hologram layer.

D. Hologram Label The hologram label in the present disclosure has the above-mentioned hologram laminate. In the present disclosure, the hologram laminate can be used as the hologram label.

When the hologram laminate is used as a hologram label, it can be configured as shown in Figs. 9(a) and (b) above. In this case, although not shown, a separator may be disposed on the surface of the first adhesive layer opposite the volume hologram layer.

E. Data Page A data page in this disclosure comprises the hologram stack described above.

The hologram laminate constituting the data page can be, for example, a hologram laminate as shown in Figures 9(a) and (b) above. In this case, the hologram laminate is a hologram transfer foil, a hologram label, or an embedding hologram sheet. In the data page, the hologram laminate can be disposed on one side of the core sheet. Also, an IC chip holding sheet containing an IC chip therein and a first transparent sheet may be disposed in that order on the side of the core sheet opposite the hologram laminate, and a second transparent sheet may be disposed on one side of the support so as to cover the metal layer, the relief hologram layer, etc.

The core sheet is a member that has a connection part for incorporating the data page into the booklet. The data page can be attached to the cover and other pages of the booklet by sewing, etc., via the connection part of the core sheet.

Examples of core sheets include fiber sheets and sheets in which resin sheets are placed on both sides of a fiber sheet.

The core sheet may also have an opening that overlaps, for example, the volume hologram layer or the relief hologram layer in a planar view. In the opening, the volume hologram layer or the relief hologram layer can be seen from one or both sides of the data page.

The IC chip holding sheet is a member that contains an IC chip inside. The IC chip holding sheet can contain an antenna and the like in addition to the IC chip inside. The IC chip holding sheet may also serve as the core sheet.

The IC chip holding sheet may have any structure that can include an IC chip, an antenna, etc., inside, and may have, for example, a multi-layer structure. Examples of resin sheets that can be used as the IC chip holding sheet include polyethylene terephthalate (PET), amorphous polyethylene terephthalate (PET-G), polyvinyl chloride (PVC), polycarbonate (PC), etc.

The IC chip holding sheet may also have an opening that overlaps, for example, the volume hologram layer or the relief hologram layer in a planar view. In the opening, the volume hologram layer or the relief hologram layer can be seen from one or both sides of the data page.

The first transparent sheet and the second transparent sheet are members that protect the surface of the data page. The first transparent sheet and the second transparent sheet may be any sheet that has transparency, and may be, for example, a resin sheet such as polyethylene terephthalate (PET), amorphous polyethylene terephthalate (PET-G), polyvinyl chloride (PVC), polycarbonate (PC), etc.

When the hologram laminate is used as a data page, the hologram laminate may have any configuration as necessary. As the optional configuration, a configuration having the desired function can be appropriately selected and used depending on the application of the data page. Examples of the optional configuration include a laser printable layer, a white layer, a printing layer, an intermediate layer, etc.

F. Booklets Booklets in the present disclosure include the above-mentioned data pages. Examples of booklets include passports.

This disclosure is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and anything that has substantially the same configuration as the technical ideas described in the claims of this disclosure and provides similar effects is included within the technical scope of this disclosure.

The following provides a more detailed explanation of this disclosure with examples.

[Example 1]
(1) Preparation of Film A and Film B First, Film A and Film B were prepared separately by independent processes.

(Preparation of Film B)
A polyethylene terephthalate (PET) film (Lumirror T60; manufactured by Toray Industries, Inc.) having a thickness of 50 μm was used as the substrate B. A resin composition in which polymethyl methacrylate was dissolved in a solvent was applied to the substrate B with a bar coater to a thickness of 1 μm, and dried to form a protective layer, thereby obtaining a film B.

(Preparation of Film A)
A volume hologram layer composition having the following composition was applied to the substrate A using a 50 μm-thick polyethylene terephthalate (PET) film (Lumirror T60; manufactured by Toray Industries, Inc.) at a speed of 30 m/min by gravure coating, and the solvent was evaporated at 100° C. to form a volume hologram formation layer having a thickness of about 10 μm. Furthermore, a 38 μm-thick polyethylene terephthalate (PET) film (SP-PET; manufactured by Mitsui Chemicals Tocello, Inc.) with a release-treated surface was laminated onto the volume hologram formation layer to obtain film A.

<Composition of Volume Hologram Layer Composition>
Polymethyl methacrylate 100 parts by weight 9,9-bis(4-acryloxydiethoxyphenyl)fluorene 5 parts by weight 1,6-hexanediol diglycidyl ether 70 parts by weight Diphenyliodonium hexafluoroantimonate 5 parts by weight 3,9-diethyl-3'-carboxymethyl-2,2'-thiocarbocyanine iodonium salt 1 part by weight Methyl ethyl ketone 30 parts by weight Methanol 30 parts by weight

(2) Preparation of volume hologram transfer foil Next, a hologram was recorded on the volume hologram forming layer, and a resin layer was laminated. Specifically, first, the release PET film was peeled off from film A, and the exposed volume hologram forming layer was laminated on a hologram master plate, and a Lippmann hologram was photographed and recorded using a laser beam with a wavelength of 532 nm at an incident angle of 45° and an exit angle of 0°. Next, film A was peeled off from the hologram master plate, and a polypropylene film (Alphan E-201F; manufactured by Oji F-Tex Co., Ltd.) was laminated on the exposed surface of the volume hologram layer to obtain a laminate 1 having a polypropylene film, a volume hologram layer, and a substrate A in this order.

Next, the polypropylene film was peeled off from the laminate 1, and the film B was laminated while being heated to 80° C. to obtain a laminate 2 having the substrate B, the protective layer, the volume hologram layer, and the substrate A in this order. The laminate 2 was then heated and fixed. Specifically, the laminate 2 was maintained in an atmosphere of 90° C. for 3 minutes, and then irradiated with ultraviolet light of 2500 mJ/cm ² from a high-pressure mercury lamp to fix it.

Next, the substrate A was peeled off from the laminate 2, and a heat sealant composition in which an ethylene-vinyl acetate copolymer was dissolved in a solvent was applied to the exposed volume hologram layer with a bar coater to a thickness of 5 μm, and then dried to form a heat seal layer. This resulted in a volume hologram transfer foil.

(3) Preparation of relief hologram label A polyethylene terephthalate (PET) film (Lumirror T60; manufactured by Toray Industries, Inc.) having a thickness of 50 μm was used as the substrate C. An ultraviolet-curable resin composition was applied to one side of the substrate C, and cured by irradiating ultraviolet light while a mold for replicating a relief hologram was attached under pressure, to form a hologram-forming layer having fine irregularities of a hologram. Aluminum was vapor-deposited to a thickness of 400 Å on the fine irregularities of the obtained hologram-forming layer to form a metal layer. A pressure-sensitive adhesive composition in which an acrylic resin (PE-118; manufactured by Nissetsu Co., Ltd.) was dissolved in a solvent was applied to the exposed surface of the metal layer by a bar coater to a thickness of 20 μm, and the applied mixture was dried to form a pressure-sensitive adhesive layer. This resulted in a relief hologram label.

(4) Preparation of Hologram Laminate The volume hologram transfer foil was transferred to the support by heating to 120° C. and pressing, and the base material B was peeled off to expose the protective layer. Thereafter, a relief hologram label was attached to the protective layer surface, and a pressure-sensitive adhesive layer was attached to laminate the volume hologram. At this time, the volume hologram was laminated by rotating the incident direction of the reproduction light 90° counterclockwise with respect to the relief hologram reproduction image.

(5) Laser drawing on metal layer A lattice pattern was drawn on the above hologram laminate with a laser beam diameter of 40 μm and a scanning interval during drawing of 220 μm, forming a pattern having a lattice-like light-transmitting portion and a light-reflecting portion with a lattice line width of 40 μm and a lattice interval of 220 μm.

[Evaluation 1]
First, the prepared hologram laminate was irradiated with a reproduction illumination light at an incidence angle of about 45°, and the hologram laminate was observed from the same side as the reproduction illumination light at an observation angle of about 0°. As shown in FIG. 25(a), only the reproduction image of the relief hologram (English alphabet letters, hemp leaf pattern, and micro-characters of "GENUINE") could be confirmed as the reproduction image at this time. Next, the reproduction illumination light was irradiated at an incidence angle of about 45° from a position where the incidence direction of the reproduction illumination light was rotated 90° counterclockwise, and the hologram laminate was observed from the same side as the reproduction illumination light at an observation angle of about 0°. As shown in FIG. 25(b), the reproduction image at this time was a volume hologram reproduction image (such as a wavy line pattern) that could be confirmed through the lattice-shaped light transmitting part. In addition, in FIG. 25(b), the reproduction image of the volume hologram could be visually observed in green. In the present disclosure, the color of the reproduction image of the volume hologram is not particularly limited.

[Example 2]
(1) Preparation of relief hologram film A 16 μm thick polyethylene terephthalate (PET) film (Lumirror; manufactured by Toray Industries, Inc.) was used as the substrate D. An ultraviolet-curable resin composition was applied to one side of the substrate D, and cured by irradiating ultraviolet light while a relief hologram duplication mold was attached under pressure to form a hologram-forming layer having fine irregularities of a hologram. Aluminum was vapor-deposited to a thickness of 400 Å on the fine irregularities of the obtained hologram-forming layer to form a metal layer. A primer resin was applied to the exposed surface of the metal layer to form a primer layer.

(2) Preparation of Hologram Laminate Next, a hologram was recorded in the volume hologram forming layer, and a resin layer was laminated. Specifically, first, the release PET film was peeled off from the film A used in Example 1, and the exposed volume hologram forming layer was laminated on the hologram master plate, and a Lippmann hologram was photographed and recorded using a laser beam with a wavelength of 532 nm at an incident angle of 45° and an exit angle of 0°. At this time, the substrate A side was set as the front side for the reproduced image of the volume hologram. Next, the film A was peeled off from the hologram master plate, and a polypropylene film (Alphan E-201F; manufactured by Oji F-Tex Co., Ltd.) was laminated on the exposed surface of the volume hologram layer to obtain a laminate 1 having a polypropylene film, a volume hologram layer, and a substrate A in this order.

Next, the polypropylene film was peeled off from the laminate 1, and the relief hologram film was laminated while being heated to 80° C. to obtain a laminate 2 having a substrate D, a relief hologram layer, a metal layer, a primer layer, a volume hologram layer, and a substrate A in this order. The laminate 2 was then heated and fixed. Specifically, the laminate 2 was maintained in an atmosphere of 90° C. for 3 minutes, and then irradiated with ultraviolet light of 2500 mJ/cm ² from a high-pressure mercury lamp to fix the laminate.

(3) Laser drawing on metal layer Drawing was performed on the above hologram laminate with a laser beam diameter of 80 μm to form an image of a human face having dot-like light-transmitting portions and light-reflecting portions each having a diameter of 80 μm.

[Evaluation 2]
First, the prepared hologram laminate was irradiated with a reconstruction illumination light from the substrate D side at an angle of about 45°, and the hologram laminate was observed from the same side as the reconstruction illumination light at an observation angle of about 0°. At this time, only the reconstruction image of the relief hologram could be observed. Next, the hologram laminate was irradiated with a reconstruction illumination light from the substrate A side at an incident angle of about 45°, and the hologram laminate was observed from the same side as the reconstruction illumination light at an observation angle of about 0°. At this time, in addition to the reconstruction image of the relief hologram, the reconstruction image of the volume hologram could also be observed. The hologram laminate was also held up to indoor lighting for observation. At this time, a human face drawn with a laser could be observed.

[Example 3]
On the hologram laminate produced in Example 2, drawing was performed with a laser beam diameter of 80 μm to form an image of a human face having a light semi-transmitting portion and a light reflective portion.

[Evaluation 3]
When the hologram laminate was observed in the same manner as in Evaluation 2, the same results as in Example 2 were obtained.

REFERENCE SIGNS LIST 1 ... Support 2 ... First adhesive layer 3 ... Volume hologram layer 4 ... First protective layer 5 ... Second adhesive layer 6 ... Metal layer 6a ... Light-transmitting portion 6b ... Light-reflecting portion 6c ... Light-semi-transmitting portion 7 ... Second substrate 8 ... Relief hologram layer 9 ... Second protective layer 10 ... Hologram laminate 11 ... First substrate 12 ... Primer layer 13 ... Laser coloring layer 14 ... Transparent sheet 15 ... Third adhesive layer 21 ... Observer 22 ... Light source

Claims (9)

A volume hologram layer;
a metal layer disposed on one surface of the volume hologram layer and having a pattern of light transmitting portions and light reflecting portions;
A hologram laminate having
the area ratio of the patterned light transmitting portion is 0.5% or more and 50% or less,
The hologram laminate is used so that an observer observes the hologram laminate from the metal layer side. The hologram laminate of claim 1, which has a relief hologram layer on the side of the metal layer opposite the volume hologram layer. The hologram laminate of claim 2, wherein the metal layer is disposed on the uneven surface of the relief hologram layer. The hologram laminate according to claim 1, which has, on the surface of the volume hologram layer opposite the metal layer, an adhesive layer, a laser coloring layer having a patterned coloring portion, and a support, in that order from the volume hologram layer side. A card comprising the hologram laminate according to any one of claims 1 to 4 . A hologram transfer foil comprising the hologram laminate according to any one of claims 1 to 4 . A hologram label comprising the hologram laminate according to any one of claims 1 to 4 . A data page comprising a hologram laminate according to any one of claims 1 to 4 . A booklet comprising the data page according to claim 8 .

Images