JP7009794B2 - Volumetric hologram laminate, manufacturing method of volume hologram laminate, and information recording medium - Google Patents

Description

The present invention relates to a volume hologram laminate having a volume hologram layer, a method for manufacturing a volume hologram laminate, and an information recording medium using the volume hologram laminate.

High counterfeiting of information recording media such as gift certificates, securities, gold tickets such as stock certificates, magnetic cards such as credit cards, prepaid cards, ID cards, IC cards, tickets, banknotes, passports, identification cards, public competition voting tickets, etc. Prevention and security functions are required.

In recent years, for example, a hologram layer in which interference fringes are recorded is provided on the surface of an information recording medium, and the reproduced image displayed by the hologram layer is used to identify authenticity, thereby preventing counterfeiting and security functions. Is improving. For example, Patent Documents 1 and 2 propose a technique relating to a hologram laminate having a base material and a hologram layer arranged on one surface of the base material, and an information recording medium using the hologram laminate.

Such a hologram layer can be roughly classified into, for example, a volume hologram layer and a relief hologram layer according to the recording form of the interference fringes. Specifically, the volume hologram layer can be obtained by interfering an object light having the same wavelength with a reference light and recording three-dimensional information about the object as interference fringes. One relief hologram layer can be obtained by forming an uneven structure on the surface and recording this as interference fringes. The volumetric hologram layer has higher diffraction efficiency than the relief hologram layer, and is used in a wide range of fields and is attracting attention from the viewpoint that advanced manufacturing technology is required. For example, Patent Documents 3 to 7 propose a technique relating to a volume hologram laminate having a volume hologram layer and an information recording medium using the volume hologram laminate.

Further, some hologram laminates having a hologram layer include a laser engraving layer that develops color by irradiation with laser light. For example, in Patent Documents 8 and 9, a hologram laminate having a base material, a hologram layer arranged on one surface of the base material, and a laser coloring layer arranged on a surface opposite to the base material of the hologram layer. We are proposing technologies related to the body and information recording media using it.

Japanese Unexamined Patent Publication No. 2014-153683 Japanese Unexamined Patent Publication No. 2014-148164 Special Table 2015-533673 Gazette Patent No. 4807504 Patent No. 4646097 Patent No. 4349613 Patent No. 4605625 Japanese Unexamined Patent Publication No. 2014-156058 International Publication No. 2012/050223

As described above, various hologram laminates have been conventionally proposed, but further improvement of anti-counterfeiting function and security function is required. An object of the present invention is to provide a volume hologram laminate having a high anti-counterfeiting function and a security function.

INDUSTRIAL APPLICABILITY The present invention is arranged on one surface of the support layer and the support layer, and is arranged on the surface of the laser engraving layer opposite to the support layer of the laser engraving layer, which develops color by irradiation with laser light, and interferes with each other. A volume hologram laminate having a volume hologram layer in which a reproduced image is recorded by stripes, the laser engraving layer has a pattern, and the pattern of the laser engraving layer is a pattern of the reproduced image of the volume hologram layer. To provide a volumetric hologram laminate characterized in that at least a part thereof has the same pattern.

According to the present invention, the pattern of the reproduced image of the volume hologram layer and the pattern of the laser engraving layer are at least partially the same, so that the volume hologram laminate having a high anti-counterfeiting function can be obtained. can. Further, by determining whether or not the pattern of the reproduced image of the volume hologram layer and the pattern of the laser engraving layer are at least partially the same pattern, a volume hologram laminate having an excellent security function is obtained. be able to.

In the present invention, it is preferable that the reproduced image of the volume hologram layer is formed within 40 mm above and below from at least one surface of the volume hologram layer with respect to the volume hologram layer. When the laser engraving layer is irradiated with laser light via the volume hologram layer, the pattern drawn by the color development of the laser engraving layer can be made clearer.

In the present invention, it is preferable to have an overcoat layer on the surface of the laser engraving layer opposite to the support layer. By protecting the laser engraving layer, it is possible to suppress color development due to the application of pressure or heat.

Further, the present invention is arranged on one surface of the support layer and the support layer, the laser engraving layer which develops color by irradiation with laser light, and the surface of the laser engraving layer opposite to the support layer. From the preparatory step of preparing a laminate having the volumetric hologram layer on which the reproduced image due to the interference fringes is recorded and the reproduction angle at which the reproduced image of the volumetric hologram layer can be reproduced, the above via the volumetric hologram layer. It has a drawing step of irradiating the laser engraving layer with a laser beam to draw a pattern, and the laser beam used in the drawing step is when the laser beam is irradiated to the laser engraving layer via the volume hologram layer. The pattern having a wavelength reflected by the reproduced image of the volume hologram layer and drawn on the laser engraving layer by the drawing step is at least a part of the same pattern as the pattern of the reproduced image of the volume hologram layer. Provided is a method for manufacturing a volumetric hologram laminate characterized by the above.

According to the present invention, by having the drawing step, the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer can be at least partially the same pattern. This makes it possible to obtain a volume hologram laminate having a high anti-counterfeiting function. Further, a volume hologram laminate having an excellent security function is determined by determining whether or not the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer are at least partially the same pattern. Can be.

In the present invention, the laser light used in the drawing step preferably has a wavelength peak within ± 10 nm of the reproduction wavelength for reproducing the reproduced image of the volume hologram layer. Since the laser light applied to the laser engraving layer has a wavelength peak in the above-mentioned range, the laser light is selectively reflected in the region where the reproduced image of the volume hologram layer is reproduced, and the laser to the laser engraving layer is emitted. The incident light can be blocked more effectively. Therefore, the same pattern as the pattern of the reproduced image of the volume hologram layer can be more effectively drawn on the laser engraving layer.

In the present invention, the reproduction angle is preferably 60 ° or less with respect to the normal of the volume hologram layer. It is possible to irradiate the surface of the laser engraving layer with laser light from a more vertical direction, and it is possible to easily draw a pattern on the laser engraving layer. Further, when the volume hologram laminate is held in the hand and visually recognized, the light from the light source at the upper part of the volume hologram laminate can be naturally diffracted in the direction of the eyes.

Further, the present invention provides an information recording medium characterized by having the above-mentioned volume hologram laminate.

According to the present invention, by having the above-mentioned predetermined volume hologram laminate, it is possible to obtain an information recording medium having a high anti-counterfeiting function and an excellent security function.

INDUSTRIAL APPLICABILITY According to the present invention, the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer can be at least partially the same pattern, and the volume hologram laminate has a high anti-counterfeiting function and a security function. Has the effect of being able to provide.

It is a schematic sectional drawing which shows an example of the volume hologram laminated body of this invention. It is a schematic process diagram which shows an example of the manufacturing method of the volume hologram laminate of this invention. It is explanatory drawing for demonstrating the volume hologram laminated body of this invention. It is explanatory drawing for demonstrating the volume hologram laminated body of this invention. It is explanatory drawing for demonstrating the volume hologram laminated body of this invention. It is explanatory drawing for demonstrating the volume hologram laminated body of this invention. It is a schematic sectional drawing which shows an example of the conventional volume hologram laminated body.

Hereinafter, the volumetric hologram laminate, the method for manufacturing the volume hologram laminate, and the information recording medium of the present invention will be described.

A. Volumetric Hologram Laminate The volume hologram laminate of the present invention is a support layer, a laser engraving layer arranged on one surface of the support layer and developing color by irradiation with a laser beam, and the support layer of the laser engraving layer. A volume hologram laminate having a volume hologram layer arranged on the opposite surface and having a reproduced image recorded by interference fringes, the laser engraving layer has a pattern, and the pattern of the laser engraving layer is It is a member characterized in that at least a part thereof is the same pattern as the pattern of the reproduced image of the volume hologram layer.

Hereinafter, the volume hologram laminate of the present invention will be described with reference to the drawings and the like. However, the present invention can be implemented in many different embodiments and is not construed as being limited to the description of the embodiments exemplified below. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

1 (a) and 1 (b) are schematic cross-sectional views showing an example of the volume hologram laminate of the present invention. As illustrated in FIGS. 1 (a) and 1 (b), the volume hologram laminate 10 of the present invention is arranged on one surface of the support layer 1 and the support layer 1, and is a laser engraving that develops color by irradiation with laser light. It has a layer 2 and a volume hologram layer 3 arranged on a surface opposite to the support layer 1 of the laser engraving layer 2 and on which a reproduced image is recorded by interference fringes.

The volume hologram laminate 10 shown in FIG. 1A is an example in which the surface of the volume hologram layer 3 opposite to the laser engraving layer 2 has an overcoat layer 4 for protecting the laser engraving layer 2. The volume hologram laminate 10 shown in FIG. 1 (b) is an example in which an overcoat layer 4 for protecting the laser engraving layer 2 is provided between the laser engraving layer 2 and the volume hologram layer 3.

Here, reference numeral 30 shown in FIGS. 1A and 1B refers to a reproduced image reproduced by the interference fringes recorded on the volume hologram layer 3, and reference numeral 20 is a pattern drawn on the laser engraving layer 2. Point to. In the present invention, the "picture 20 drawn on the laser engraving layer 2" refers to a picture defined by the color of the laser engraving layer 2 being developed by irradiation with laser light. Specifically, for example, when the laser light L is irradiated to the laser engraving layer 2 via the volume hologram layer 3, the uncolored region without being irradiated with the laser light becomes the “laser engraving layer 2”. The drawn pattern 20 ”. Since a detailed description of this point will be given with reference to FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b), the description thereof will be omitted here.

In the present invention, the pattern drawn on the laser engraving layer is characterized in that at least a part of the pattern is the same as the pattern of the reproduced image of the volume hologram layer. Here, the "same pattern" refers to a pattern that matches when viewed in a plan view, or the same pattern formed at an overlapping position when viewed in a plan view. The volumetric hologram laminate of the present invention having such characteristics can be obtained, for example, as follows. 2 (a) and 2 (b) are schematic process diagrams showing an example of the method for manufacturing the volumetric hologram laminate of the present invention. In the present invention, first, as shown in FIG. 2A, a laminated body in which the support layer 1, the laser engraving layer 2 and the volume hologram layer 3 are laminated is prepared. At this time, it is assumed that a predetermined interference fringe is recorded on the volume hologram layer 3. The interference fringes can be recorded on the volume hologram layer 3 by a general method, for example, by interfering the object light having the same wavelength with the reference light. Next, in the present invention, as shown in FIG. 2B, the laser engraving is performed via the volume hologram layer 3 from the reproduction angle at which the reproduced image 30 is reproduced by the interference fringes recorded on the volume hologram layer 3. The layer 2 is irradiated with the laser beam L. At this time, the laser light L irradiated from the reproduction angle has a wavelength peak equivalent to that of the laser light used for recording the interference fringes on the volume hologram layer. Therefore, for example, as shown in FIG. 3A, the laser light L irradiated to the laser engraving layer 2 via the volume hologram layer 3 is in the region where the reproduced image 30 is reproduced in the volume hologram layer 3. reflect. On the other hand, the laser light L irradiated to the laser engraving layer 2 via the volume hologram layer 3 is transmitted in the volume hologram layer 3 in the region where the reproduced image 30 is not reproduced, in other words, in the region where the interference fringes are not recorded. Then, it is incident on the laser engraving layer 2. Then, as shown in FIG. 3B, the laser beam L is transferred to the laser engraving layer 2 via the volume hologram layer 3 in the region where the reproduced image 30 due to the interference fringes recorded on the volume hologram layer 3 is reproduced. In the laser engraving layer 2, the region corresponding to the reproduced image 30 is an uncolored region, and this is the pattern 20 drawn on the laser engraving layer 2. The reproduced image 30 in FIGS. 3A and 3B shows a reproduced image 30 reproduced when the volume hologram layer 3 is observed from a reproduction angle.

The present invention is characterized in that "the pattern drawn on the laser engraving layer is at least partly the same as the pattern of the reproduced image of the volume hologram layer". "The pattern drawn on the laser engraving layer is at least partly the same as the pattern of the reproduced image of the volume hologram layer", for example, as shown in FIGS. 3 (a) and 3 (b), the laser engraving. The pattern 20 drawn on the layer 2 may be the same as the pattern of the reproduced image 30 of the volume hologram layer 3, or as shown in FIGS. 4A and 4B, the laser engraving layer 2 may have the same pattern 20. The drawn pattern 20 may be partially the same as the pattern of the reproduced image 30 of the volume hologram layer 3. When the pattern 20 drawn on the laser engraving layer 2 has the same pattern as the pattern of the reproduced image 30 of the volume hologram layer 3, for example, the volume hologram stacking of the present invention is performed by the following method. You can create a body. That is, as shown in FIG. 4A, by irradiating only the region having the same pattern as the pattern of the reproduced image 30 of the volume hologram layer 3 with the laser beam L through the volume hologram layer 3, FIG. 4 (a) As shown in b), it is possible to obtain a volume hologram laminate in which the pattern drawn on the laser engraving layer 2 is only partially the same as the pattern of the reproduced image 30 of the volume hologram layer 3. The reproduced image 30 in FIGS. 4A and 4B shows a reproduced image 30 reproduced when the volume hologram layer 3 is observed from a reproduction angle.

The laser engraving layer in the present invention has a pattern drawn by irradiation with laser light, and the volume hologram layer has a reproduced image reproduced by recording interference fringes. Further, in the present invention, the pattern of the reproduced image reproduced by the volume hologram layer and the pattern drawn on the laser engraving layer are at least partially the same pattern. Such a volume hologram laminate of the present invention can be obtained by a predetermined method. That is, as shown in FIGS. 2A and 2B, the laser engraving layer 2 is subjected to volume by irradiating the laser engraving layer 2 with laser light via the volume hologram layer 3 having the reproduced image 30. A pattern 20 having at least a part of the same pattern as the pattern of the reproduced image 30 of the hologram layer 3 can be drawn. Here, the laser light used for drawing a pattern on the laser engraving layer needs to have the same wavelength as the reference light used for recording the interference fringes on the volume hologram layer 3. Further, the laser beam needs to be emitted from an angle at which the reproduced image of the volume hologram layer is reproduced. In the present invention, the laser light used for drawing a pattern on the laser engraving layer satisfies the above-mentioned conditions, and as shown in FIGS. 3A and 3B, the reproduced image of the volume hologram layer 3 is used. In the region where 30 is reproduced, the laser beam L is reflected, and in the other regions, the laser beam L is incident on the laser engraving layer 2 via the volume hologram layer 3, and as a result, is reproduced by the volume hologram layer 3. The pattern of the reproduced image 30 to be reproduced and the pattern 20 drawn by the selective color development of the laser engraving layer 2 can be at least partially the same pattern.
In the present invention, by adopting such a peculiar method, the volume of the reproduced image reproduced by the volume hologram layer and the pattern drawn on the laser engraving layer are at least a part of the same volume. It is possible to obtain a hologram laminate. Therefore, for example, when the pattern of the laser engraving layer is drawn without passing through the volume hologram layer in which the interference fringes are recorded, or when the laser engraving layer on which the predetermined pattern is drawn is peeled off, another volume hologram laminate is formed. When used in, it is difficult to obtain a volume hologram laminate as in the present invention. As described above, the volume hologram laminate of the present invention has a high anti-counterfeiting function.

By the way, the pattern of the reproduced image of the volume hologram layer is selectively reproduced at two angles, the irradiation angle of the object light irradiated when recording the interference fringes and the irradiation angle of the reference light. On the other hand, the pattern of the laser engraving layer can be confirmed from an angle other than the above-mentioned two angles. Therefore, from the two angles at which the reproduced image of the volume hologram layer is reproduced, both the pattern of the reproduced image and the pattern drawn on the laser engraving layer, which is a part of the same pattern as the pattern of the reproduced image, are displayed. It can be confirmed, and from other angles, only the pattern drawn on the laser engraving layer can be confirmed. In the present invention, the pattern itself of the reproduced image of the volume hologram layer, the pattern itself of the laser engraving layer, and the pattern of the reproduced image of the volume hologram layer and the pattern of the laser engraving layer are at least partially the same pattern. From the three points, it is possible to obtain a volume hologram laminate having an excellent security function.

For example, Patent Documents 8 and 9 disclose a hologram laminate in which a hologram layer and a laser engraving layer are laminated. However, the invention according to Patent Document 8 is an invention in which the hologram layer is destroyed when the hologram layer is to be peeled off by having a heat-adhesive layer between the hologram layer and the laser engraving layer. Further, the invention according to Patent Document 9 is an invention in which the hologram layer and the like are suppressed from being damaged by the heat generated when the laser engraving layer is irradiated with the laser beam. Therefore, although Patent Documents 8 and 9 disclose a hologram laminate having a hologram layer and a laser engraving layer, the anti-counterfeiting function and the security function are completely different from those of the present invention.

Hereinafter, each configuration and use of the volume hologram laminate of the present invention will be described.

1. 1. Structure The volume hologram laminate of the present invention is arranged on one surface of the support layer and the support layer, and is arranged on the surface opposite to the support layer of the laser engraving layer and the laser engraving layer which develops color by irradiation with laser light. It has a volume hologram layer on which a reproduced image is recorded by interference fringes. Further, the laser engraving layer in the volumetric hologram laminate of the present invention has a pattern, and the pattern of the laser engraving layer is characterized in that at least a part of the pattern is the same as the pattern of the reproduced image of the volume hologram layer. do.

Hereinafter, each configuration of the volume hologram laminate of the present invention will be described.

(1) Volume Hologram Layer The volume hologram layer in the present invention is a member arranged on a surface opposite to the support layer of the laser engraving layer described later, and a reproduced image is recorded by interference fringes.

Interference fringes are recorded in the volume hologram layer in the present invention, and the reproduced image is reproduced by the interference fringes. The volume hologram layer in the present invention is usually a reflective volume hologram layer. Here, the "reflective volume hologram layer" refers to a volume hologram layer capable of reproducing a reproduced image by irradiating the reproduced light from the surface of the volume hologram layer on the observer side.

The reproduced image reproduced by the interference fringes recorded on the volume hologram layer can be appropriately designed by adjusting the intervals and angles of the interference fringes. Examples of the reproduced image of the volume hologram layer include a pattern including characters, figures, and the like.

In the present invention, by irradiating the volume hologram layer with the reproduction light from a predetermined angle, the reproduction image is reproduced by the interference fringes recorded on the volume hologram layer. Here, the "regenerated light" refers to light having the same wavelength as the reference light used when recording the interference fringes on the volume hologram layer. Further, the "predetermined angle" corresponds to an angle irradiated with object light and reference light in order to record interference fringes on the volume hologram layer. That is, there are two angles for irradiating the reproduced light in order to reproduce the reproduced image. Hereinafter, the angle may be referred to as a reproduction angle. The reproduction angle in the present invention corresponds to the angle of the object light and the reference light irradiated to record the interference fringes. That is, the reproduction angle is ± 0 ° with respect to the irradiation angle of the object light or the irradiation angle of the reference light.
Hereinafter, the irradiation angle of the object light may be referred to as the object light angle, and the irradiation angle of the reference light may be referred to as the reference light angle.

In the present invention, it is preferable that the reproduced image recorded on the volume hologram layer is imaged at a predetermined position on the volume hologram layer by design. Hereinafter, description will be made with reference to FIGS. 6 (a) to 6 (c). 6 (a) to 6 (c) are explanatory views for explaining the volume hologram laminate of the present invention. In the present invention, for example, as shown in FIG. 6A, it is preferable that the reproduced image 30 of the volume hologram layer is imaged at a predetermined position with respect to the volume hologram layer 3. In particular, as shown in FIG. 6B, it is preferable that the reproduced image 30 of the volume hologram layer is imaged at the position of the volume hologram layer. When the laser engraving layer is irradiated with laser light via the volume hologram layer, the pattern drawn by the color development of the laser engraving layer can be made clearer. On the other hand, as shown in FIG. 6C, when the reproduced image 30 of the volume hologram layer is imaged at a position away from the volume hologram layer 3, the laser is applied to the laser engraving layer via the volume hologram layer. When irradiated with light, the pattern drawn due to the color development of the laser engraving layer may be blurred, resulting in an unclear pattern. Therefore, in the present invention, as shown in FIG. 6A, it is preferable that the reproduced image 30 of the volume hologram layer is imaged at a predetermined position from at least one surface of the volume hologram layer 3. Specifically, a reproduced image formed within 40 mm above and below from at least one surface of the volume hologram layer 3 on the laser engraving layer side or the surface of the volume hologram layer opposite to the laser engraving layer. It is preferable to have a reproduced image formed within 20 mm above and below, and particularly preferably to have a reproduced image formed within 10 mm above and below.

Further, in the reproduced image of the volume hologram layer in the present invention, it is preferable that all the reproduced images are reproduced from at least one surface of the volume hologram layer within the above-mentioned range. In the present invention, when the reproduced image is observed from the direction opposite to the laser engraving layer of the volume hologram layer, the reproduced image is reproduced at a position within a predetermined range from at least one surface of the volume hologram layer. Therefore, the pattern of the reproduced image can be observed as a clear pattern. Therefore, for example, in the reproduced image of the volume hologram layer, when the pattern portion to be drawn on the laser engraving layer is reproduced at a predetermined position from at least one surface of the volume hologram layer by design, the volume hologram layer is reproduced. The pattern portion of the image can be a clear pattern, and the pattern drawn on the laser engraving layer can also be a pattern with clear coloring. As described above, the "at least one surface of the volume hologram layer" here means the surface of the volume hologram layer on the laser engraving layer side or the surface of the volume hologram layer on the opposite side of the laser engraving layer. Refers to at least one side of.

The volumetric hologram layer in the present invention usually has transparency. The transparency of the volume hologram layer can be the same as that of a general volume hologram layer, and can be appropriately adjusted according to the use of the volume hologram laminate of the present invention.

The material used for the volume hologram layer in the present invention can be the same as the material used for a general volume hologram layer, and can be, for example, a cured resin layer, a thermoplastic resin layer, a photosensitive layer, or the like. Specific materials used for the volumetric hologram layer include, for example, thermosetting resin, ionizing radiation curable resin, thermoplastic resin layer, silver salt material, gelatin dichromate emulsion, photopolymerizable resin, and photocrosslinkable resin. , Photoreactive materials such as photoresists, photorefractive materials made of inorganic materials, photosensitive materials such as photochromic materials, and the like. Among them, it contains a binder resin, a photopolymerizable compound, a photosensitive material containing a photopolymerization initiator and a sensitizing dye, a cationically polymerizable compound, a radically polymerizable compound, a photoradical polymerization initiator and a photocationic polymerization initiator. A photosensitive material can be preferably used. Since the composition and the like of the above-mentioned photosensitive material can be the same as those described in, for example, Japanese Patent Application Laid-Open No. 2013-066960, the description thereof is omitted here.

The volume hologram layer in the present invention may contain other additives, if necessary, in addition to the above-mentioned materials. Since the additives that can be used for the volume hologram layer can be the same as the additives used for a general volume hologram layer, the description here is omitted.

The volume hologram layer in the present invention may be formed over the entire surface of one surface of the support layer described later, or may be formed in a part thereof. Further, the volume hologram layer in the present invention may be arranged so as to overlap with the laser engraving layer described later in a plan view. Specifically, the reproduced image reproduced by the interference fringes recorded on the volume hologram layer is produced. , It suffices if it is arranged so as to overlap with the laser engraving layer described later in a holographic view. Here, "the volume hologram layer is arranged so as to overlap the laser engraving layer described later in a plan view" means that it is sufficient that at least a part of the volume hologram layer overlaps the laser engraving layer described later in a plan view. Further, "arranged so that the reproduced image overlaps the laser engraving layer described later in a plan view" means that it is sufficient that at least a part of the reproduced image of the volume hologram layer overlaps the laser engraving layer described later in a plan view. ..

The thickness of the volume hologram layer in the present invention can be appropriately adjusted according to the use of the volume hologram laminate of the present invention, the material of the volume hologram layer, and the like, and is not particularly limited. Since the specific thickness of the volume hologram layer can be the same as the thickness of a general volume hologram layer, the description here is omitted.

Examples of the method for forming the volume hologram layer in the present invention include a method in which an object light having the same wavelength and a reference light are made to interfere with each other in a volume hologram layer made of a predetermined material to record interference fringes. Specifically, as a method for forming the reflective volume hologram layer, a method of incident object light from one surface of the volume hologram layer and incident reference light from the other surface to record interference fringes can be mentioned.

(2) Laser Engraving Layer The laser engraving layer in the present invention is a member that is arranged on one surface of a support layer and develops color by irradiation with laser light. Further, the laser engraving layer has a pattern drawn by irradiation with laser light, and the pattern drawn on the laser engraving layer is characterized in that at least a part of the pattern is the same as the pattern of the reproduced image of the volume hologram layer. And.

The laser engraving layer in the present invention is a member on which a predetermined pattern is drawn. Examples of the pattern drawn on the laser engraving layer include a pattern including characters, figures, and the like.

The pattern drawn on the laser engraving layer is represented in two dimensions. Further, the pattern drawn on the laser engraving layer can be observed from any angle, unlike the reproduced image of the volume hologram layer observed only from a predetermined angle, that is, a so-called reproduction angle. Therefore, in the present invention, both the pattern of the laser engraving layer and the pattern of the reproduced image of the volume hologram layer are observed from the reproduction angle, and only the image of the laser engraving layer is observed from an angle other than the reproduction angle.

The pattern drawn on the laser engraving layer is at least partly the same as the pattern of the reproduced image of the volume hologram layer. Regarding "the pattern drawn on the laser engraving layer is at least partly the same as the pattern of the reproduced image of the volume hologram layer", FIGS. 3 (a), 3 (b) and 4 (a). , (B) can be the same as the description thereof, and thus the description thereof is omitted here.

In the present invention, it can be confirmed by, for example, the following method whether or not the pattern drawn on the laser engraving layer is at least partially the same as the pattern of the reproduced image of the volume hologram layer. That is, using a camera or the like with a fixed position, first, the reproduced light is incident from the reproduction angle, and the reproduced image of the obtained volume hologram layer is photographed. Next, it can be confirmed by turning off the reproduced light, photographing the pattern drawn on the laser engraving layer obtained when the reproduced image of the volume hologram layer becomes invisible, and determining whether the relative positions of the two images are misaligned. ..

The laser engraving layer in the present invention develops a color by irradiation with a laser beam and a pattern is drawn. At this time, the color-developed or discolored laser engraving layer shows not only the presence or absence of color development or discoloration but also the shade of color. The shade can be adjusted by, for example, the amount of laser light incident on the laser engraving layer. The amount of laser light incident on the laser engraving layer is adjusted by adjusting the brightness of the diffracted light in the reproduced image as described in the section "B. Manufacturing method of volumetric hologram laminate 1. Preparation step" described later. Can be done by.

The laser engraving layer in the present invention may be any member as long as it is a member that develops color by irradiation with laser light, and for example, it is preferable to have a material that develops color or changes color by energy of laser light. The material used for the laser engraving layer can be the same as the material used for a general laser engraving layer, and is not particularly limited. For example, a color-developing material such as a polycarbonate alone, a polycarbonate-based material, a vinyl chloride-based material, a polyester-based material, a mixed material thereof, or a laminated material in which layers composed of these materials are laminated can be mentioned. In the present invention, the laser engraving layer may contain a plurality of types of coloring materials, but when the laser engraving layer is irradiated with laser light to draw a pattern, a single coloring material develops color. , It is preferable that the pattern is a single color. For example, by irradiating with laser light, the laser engraving layer can be colored from white to black.

The thickness of the laser engraving layer in the present invention can be appropriately adjusted according to the material constituting the laser engraving layer, the application of the volume hologram laminate of the present invention, and the like, and the thickness of the general laser engraving layer. The same can be said. Therefore, the specific description here is omitted.

(3) Support layer The support layer in the present invention is a member that supports the above-mentioned volume hologram layer and laser engraving layer.

The support layer in the present invention may or may not have transparency. It can be appropriately selected depending on the intended use of the volume hologram laminate of the present invention. Examples of the material used for the support layer include a polycarbonate film, a polyethylene film, a polypropylene film, a polyfluoroethylene film, a polyvinylidene fluoride film, a polyvinyl chloride film, a vinylidene chloride film, and an ethylene-vinyl alcohol copolymer film. Polyvinyl alcohol film, polymethyl methacrylate film, polyether sulfone film, polyether ether ketone film, polyamide film, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer film, polyester film such as polyethylene terephthalate film, resin film such as polyimide film , Resin sheet, glassin paper, synthetic paper (polyolefin-based, polystyrene-based, etc.), high-quality paper, medium-quality paper, art paper, coated paper, cast-coated paper.

The thickness of the support layer in the present invention can be appropriately selected depending on the intended use of the volume hologram laminate of the present invention, and is not particularly limited. For example, it can be in the range of 2 μm or more and 2000 μm or less, and preferably in the range of 10 μm or more and 1000 μm or less.

(4) Overcoat Layer In the present invention, it is preferable to have an overcoat layer on the surface opposite to the support layer of the laser engraving layer. The laser engraving layer may develop color due to pressure or heat applied in addition to the irradiation of laser light. Therefore, by protecting the laser engraving layer with the overcoat layer, it is possible to suppress color development due to the application of pressure or heat.

The overcoat layer in the present invention may be arranged so as to protect the laser engraving layer. For example, as shown in FIG. 1 (a), the overcoat layer 4 may be arranged on the surface of the volume hologram layer 3 opposite to the laser engraving layer 2, and as shown in FIG. 1 (b). The overcoat layer 4 may be arranged between the laser engraving layer 2 and the volume hologram layer 3.

The overcoat layer in the present invention preferably has transparency to such an extent that the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer can be visually recognized. The specific transparency of the overcoat layer is not specified by a strict numerical value, and can be appropriately determined depending on the use of the volume hologram laminate of the present invention and the like. In addition, transparency includes colorless transparency and colored transparency.

The overcoat layer in the present invention preferably has a low haze value. This is because the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer can be visually recognized well. The haze value of the overcoat layer can be, for example, in the range of 0.5 or more and 1.5 or less.

The overcoat layer in the present invention may be, for example, a film base material or a resin base material. Examples of the film substrate include polycarbonate film, polyethylene film, polypropylene film, polyvinylethylene-based film, polyvinylidene fluoride film, vinyl chloride film, vinylidene chloride film, ethylene-vinyl alcohol film, polyvinyl alcohol film, and polymethyl. Examples thereof include methacrylate films, polyether sulfone films, polyether ether ketone films, polyamide films, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer films, polyester films such as polyethylene terephthalate films, and polyimide films. Examples of the resin base material include acrylic and methacrylic resins such as polymethyl acrylate and polymethyl methacrylate, polyvinyl chloride resin, cellulose resin, silicone resin, rubber chloride, casein, various surfactants, and metal oxidation. Examples thereof include one or a mixture of two or more of the substances, epoxy-modified acrylate resin, urethane-modified acrylate resin, acrylic-modified polyester and the like.

The thickness of the overcoat layer in the present invention is preferably such that it can exhibit predetermined transparency and sufficiently protect the laser engraving layer. For example, it is preferably in the range of 0.1 μm or more and 500 μm or less, and more preferably in the range of 0.5 μm or more and 200 μm or less.

(5) Other Members The volume hologram laminate of the present invention may have other members, if necessary, in addition to the above-mentioned members.

Examples of other members in the present invention include an antistatic layer, an adhesive layer or an adhesive layer, a mold release layer, a magnetic recording layer, an IC chip, an optical recording layer, and the like, and each layer is timely laminated according to the application. be able to.

2. 2. Applications The volume hologram laminate of the present invention can be used for members that require high security such as anti-counterfeiting. Above all, it is suitably used for a member for which it is desired to give different information (variable information) to each volume hologram laminate, for example, an information recording medium. Examples of the information recording medium include gold tickets such as gift certificates, securities and stock certificates, various cards such as magnetic cards and IC cards, tickets, banknotes, passports, identification cards, public competition voting tickets and the like.

B. Method for manufacturing a volumetric hologram laminate The method for manufacturing a volumetric hologram laminate according to the present invention is a laser engraving layer which is arranged on one surface of a support layer and the support layer and develops color by irradiation with a laser beam, and the laser engraving layer. A preparatory step of preparing a laminate having a volume hologram layer arranged on a surface opposite to the support layer of the above and recording a reproduced image due to interference fringes, and reproducing the reproduced image of the volume hologram layer can be performed. It has a drawing step of irradiating the laser engraving layer with laser light through the volume hologram layer to draw a pattern from a possible reproduction angle, and the laser light used in the drawing step passes through the volume hologram layer. When the laser light is irradiated to the laser engraving layer, the pattern is reflected by the reproduced image of the volume hologram layer, and the pattern drawn on the laser engraving layer by the drawing step is the pattern of the reproduced image of the volume hologram layer. This method is characterized in that at least a part of them have the same pattern.

The method for producing the volume hologram laminate of the present invention can be shown by FIGS. 2 (a) and 2 (b). Since FIGS. 2 (a) and 2 (b) can be the same as those described in the above section “A. Volume hologram laminate”, the description thereof is omitted here.

According to the present invention, by having the drawing step, the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer can be at least partially the same pattern. This makes it possible to obtain a volume hologram laminate having a high anti-counterfeiting function. Further, a volume hologram laminate having an excellent security function is determined by determining whether or not the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer are at least partially the same pattern. Can be. Since the description of the specific effect can be the same as the content described in the above section "A. Volume hologram laminate", the description here is omitted.
Hereinafter, the method for manufacturing the volumetric hologram laminate of the present invention will be described separately for each step.

1. 1. Preparation Step In the preparation step in the present invention, the laser engraving layer arranged on one surface of the support layer and the support layer and developing color by irradiation with laser light, and the surface of the laser engraving layer opposite to the support layer. This is a step of preparing a laminated body having a volume hologram layer arranged in the above and on which a reproduced image due to interference fringes is recorded.

In the present invention, the method for forming the support layer, the laser engraving layer, and the volume hologram layer constituting the laminated body can be the same as a generally known method, and thus the description thereof is omitted here.

The volume hologram layer in the laminated body prepared in the preparation step is a member on which a reproduced image is recorded by interference fringes. The recording of the interference fringes on the volume hologram layer includes, for example, a method of irradiating the volume hologram layer with object light and reference light. Here, the object light angle for irradiating the object light and the reference light angle for irradiating the reference light correspond to the reproduction angles at which the reproduced image of the volume hologram layer can be reproduced. In the present invention, the reproduction angle is preferably within a predetermined range. Specifically, when the normal of the surface of the volume hologram layer opposite to the laser engraving layer is 0 °, the reproduction angle is preferably closer to 0 °. For example, as shown in FIG. 5, the reproduction angle is preferably such that the angle θ formed by the normal of the volume hologram layer 3 is 60 ° or less, and more preferably 50 ° or less. In the present invention, when the reproduction angle is within the above range, the following effects are obtained. That is, in the present invention, in order to make at least a part of the pattern of the reproduced image of the volume hologram layer the same, in the drawing step described later, from the reproduction angle of the reproduced image of the volume hologram layer, through the volume hologram layer, A laser beam is applied to the laser engraving layer. At this time, when the reproduction angle is within the above range, it becomes possible to irradiate the surface of the laser engraving layer on the volume hologram layer side with the laser light from a more vertical direction in the drawing step described later, and the laser engraving can be performed. It has the effect that the pattern can be easily drawn on the layer.

In the reproduced image of the volume hologram layer, the brightness of the diffracted light is usually determined according to the interval and angle of the interference fringes. In the present invention, when the laser engraving layer is colored by irradiating the laser beam from the reproduction angle through the volume hologram layer, the region where the brightness of the diffracted light is higher in the reproduced image reproduced by the volume hologram layer is the laser. Light is reflected, while the lower the brightness of the diffracted light, the more the laser light tends to be transmitted. Therefore, in the reproduced image of the volume hologram layer, the region where the brightness of the diffracted light is higher can suppress the incident of the laser light on the laser engraving layer and suppress the color development of the laser engraving layer. On the other hand, in the reproduced image of the volume hologram layer, the lower the brightness of the diffracted light, the more the laser light is incident on the laser engraving layer, and the laser engraving layer can be colored. Therefore, it is possible to adjust the amount of laser light incident on the laser engraving layer by adjusting the brightness of the diffracted light in the reproduced image of the volume hologram layer, and it is possible to add light and shade to the color development of the laser engraving layer by the laser light. Become. Therefore, it is possible to obtain a volume hologram laminate having a higher anti-counterfeiting function and a security function. The "high and low brightness of the diffracted light" indicates the degree of reflection of the laser light when a predetermined laser light is irradiated from the reproduction angle of the reproduced image of the volume hologram layer. For example, the reflection of the laser light is large. The brighter the diffracted light, the higher the brightness.

Since the laminate prepared by the preparation step can be the same as the content described in the above-mentioned "A. Volume hologram laminate", the description here is omitted.

2. 2. Drawing step The drawing step in the present invention is a step of irradiating the laser engraving layer with a laser beam through the volume hologram layer from a reproduction angle at which the reproduced image of the volume hologram layer can be reproduced to draw a pattern. Further, the laser light used in the drawing step has a wavelength reflected by the reproduced image of the volume hologram layer when the laser beam is irradiated to the laser engraving layer through the volume hologram layer, and the laser engraving layer is reflected by the drawing step. The pattern drawn in is at least partly the same as the pattern of the reproduced image of the volume hologram layer.

In the present invention, it is preferable that the laser light is irradiated to the laser engraving layer from the reproduction angle at which the reproduced image of the volume hologram layer is reproduced. Since the angle of the laser light applied to the laser engraving layer is the same as the reproduction angle, the laser light is selectively reflected in the region where the reproduced image of the volume hologram layer is reproduced, and the laser light is incident on the laser engraving layer. Can be blocked. Therefore, the same pattern as the pattern of the reproduced image of the volume hologram layer can be drawn on the laser engraving layer. Here, "the angle of the laser light irradiating the laser engraving layer is the same as the reproduction angle" means that the angle of the laser light irradiating the laser engraving layer is, for example, ± 5 ° with respect to the reproduction angle. It means that it is within the range of ± 2 °, and it is preferable that it is within the range of ± 2 °.

Here, the reproduction angle at which the reproduced image of the volume hologram layer is reproduced corresponds to the object light angle of the object light irradiated when recording the interference fringes on the volume hologram layer and the reference light angle of the reference light. Therefore, there are two reproduction angles at which the reproduced image of the volume hologram layer is reproduced. In the drawing process of the present invention, the laser engraving layer is irradiated with laser light from the same angle as the reproduction angle, but of the two reproduction angles, the one closer to the surface of the volume hologram layer is closer to perpendicular. It is preferable to irradiate the laser engraving layer with laser light from the same angle as the reproduction angle. The "reproduction angle of the two reproduction angles that is closer to perpendicular to the surface of the volume hologram layer" is closer to 0 ° when the normal of the volume hologram layer is 0 °. Since it corresponds to the object light angle or the reference light angle and is the same as the content described in the above "1. Preparation step", the description here is omitted.

In the present invention, it is preferable that the laser light applied to the laser engraving layer has the same wavelength as the reproduction wavelength for reproducing the reproduced image of the volume hologram layer. As a result, in the region where the reproduced image of the volume hologram layer is reproduced, the laser light is reflected on the volume hologram layer, and the same pattern as the pattern of the reproduced image of the volume hologram layer can be drawn on the laser engraving layer. Here, the "reproduction wavelength for reproducing the reproduced image of the volume hologram layer" refers to the same wavelength as the reference light used when recording the interference fringes on the volume hologram layer. Specifically, it means that the wavelength peak at the reproduction wavelength is within ± 10 nm of the wavelength peak of the reference light. Further, "having the same wavelength as the reproduction wavelength" means that the laser light applied to the laser engraving layer has the same wavelength as the reproduction light for reproducing the reproduction image of the volume hologram layer. Specifically, the laser light irradiating the laser engraving layer preferably has a wavelength peak within the reproduction wavelength range of, for example, ± 10 nm for reproducing the reproduced image of the volume hologram layer, and more preferably within the range of ± 5 nm. It is preferable to have a wavelength peak at. Since the laser light emitted to the laser engraving layer has a wavelength peak in the above-mentioned range, the laser light is selectively reflected in the region where the reproduced image of the volume hologram layer is reproduced, and the laser light is incident on the laser engraving layer. Can be blocked. In other words, the laser light applied to the laser engraving layer preferably has a wavelength reflected by the reproduced image of the volume hologram layer. Therefore, the same pattern as the pattern of the reproduced image of the volume hologram layer can be drawn on the laser engraving layer.

In the drawing process of the present invention, a pattern is drawn by developing a color by irradiation with a laser beam. At this time, the laser beam is emitted through the volume hologram layer from the reproduction angle of the reproduced image of the volume hologram layer. Further, in the region where the reproduced image of the volume hologram layer is reproduced, the laser light is reflected by the volume hologram layer, and in the region where the reproduced image of the volume hologram layer is not reproduced, the laser light is transmitted through the volume hologram layer. Therefore, in the laser engraving layer, the region corresponding to the region where the reproduced image of the volume hologram layer is reproduced is not irradiated with the laser light, and the region corresponding to the region where the reproduced image of the volume hologram layer is not reproduced is the region. , Laser light is irradiated. In the region irradiated with the laser beam in the laser engraving layer, the material contained in the laser engraving layer develops or discolors. At this time, the color-developed or discolored laser engraving layer shows not only the presence or absence of color development or discoloration but also the shade of color. The shade can be adjusted by, for example, the amount of laser light incident on the laser engraving layer. The amount of laser light incident on the laser engraving layer can be adjusted by adjusting the brightness of the diffracted light in the reproduced image as described in the above section "1. Preparation step".

The drawing process is a process of irradiating the laser engraving layer with laser light to draw a pattern. The detailed description of this step is the same as that described in the sections of "A. Volume hologram laminate (1) Volume hologram layer" and "A. Volume hologram laminate (2) Laser engraving layer". Therefore, the description here is omitted.

3. 3. Other Steps The method for producing a volumetric hologram laminate of the present invention may have the above-mentioned preparation step and drawing step, and may have other steps as necessary. Other steps include, for example, a step of forming an overcoat layer on the surface of the laser engraving layer opposite to the support layer.

The overcoat layer forming step in the present invention may be performed before the drawing step or after the drawing step. For example, as shown in FIG. 1A, in the case of manufacturing the volume hologram laminate 10 in which the support layer 1, the laser engraving layer 2, the volume hologram layer 3 and the overcoat layer 4 are laminated in this order, first, the support is supported. The laser engraving layer 2 is arranged on one surface of the layer 1, and then the volume hologram layer 3 on which the interference fringes are recorded by the first step is arranged on the surface of the laser engraving layer 2 opposite to the support layer 1. After that, the laser engraving layer 2 is irradiated with laser light via the volume hologram layer 3 by the drawing step, and then the surface of the volume hologram layer 3 opposite to the laser engraving layer 2 is overcoated by the overcoat layer forming step. The layer can be formed to manufacture the volumetric hologram laminate 10. On the other hand, for example, in the case of manufacturing the volume hologram laminate 10 in which the support layer 1, the laser engraving layer 2, the overcoat layer 4 and the volume hologram layer 3 are laminated in this order, for example, as shown in FIG. 1 (b), first. , The laser engraving layer 2 is arranged on one surface of the support layer 1, and then the overcoat layer is formed on the surface of the laser engraving layer 2 opposite to the support layer 1 by the overcoat layer forming step, and then the overcoat layer is formed. In the first step, the volume hologram layer 3 on which the interference fringes are recorded is arranged on the surface of the laser engraving layer 2 opposite to the support layer 1, and then in the drawing step, the laser engraving layer 2 is formed via the volume hologram layer 3. The volume hologram laminate 10 can be manufactured by irradiating with a laser beam.

In the method for manufacturing the volume hologram laminate 10 shown in FIG. 1A described above, the support layer 1, the laser engraving layer 2, the volume hologram layer 3 and the overcoat layer 4 are laminated in this order after the overcoat layer forming step. It may have a step of pressing and compressing the laminated body. On the other hand, in the method for manufacturing the volume hologram laminate 10 shown in FIG. 1B described above, a laminate in which the support layer 1, the laser engraving layer 2 and the overcoat layer 4 are laminated in this order is obtained after the overcoat layer forming step. It may have a step of pressing and compressing. As described above, by having the step of pressing and compressing the laminated body in which the predetermined members are laminated, each member constituting the compressed laminated body is integrated. Therefore, it becomes difficult to take out each member, and it becomes possible to improve security.

C. Information Recording Medium The information recording medium of the present invention is a product characterized by having the above-mentioned volume hologram laminate.

FIG. 7A is a schematic plan view showing an example of the information recording medium of the present invention. Further, FIG. 7 (b) is a cross-sectional view taken along the line AA of FIG. 7 (a). As shown in FIGS. 7A and 7B, the information recording medium 100 of the present invention has a volume hologram laminate 10. Since the volume hologram laminate 10 shown in FIGS. 7 (a) and 7 (b) is the same as the volume hologram laminate 10 described in FIG. 1 (a), the description thereof is omitted here. Further, the information recording medium 100 of the present invention may have the base material 5, for example, in the information recording medium 100 shown in FIGS. 7A and 7B, the base material 5 and the volume hologram laminate are used. The support layer 1 in 10 is used as a single member. Further, as shown in FIGS. 7 (a) and 7 (b), in the present invention, the print layer 6 may be arranged on the same surface as the surface on which the volume hologram laminate 10 of the base material 5 is arranged. ..

According to the present invention, the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer are at least partially the same, so that the information recording medium has a high anti-counterfeiting function. Can be done. Further, by determining whether or not the pattern of the reproduced image of the volume hologram layer and the pattern drawn on the laser engraving layer are at least a part of the same pattern, it is an information recording medium having an excellent security function. can do. The description of the specific effect can be the same as that described in the above section "A. Volume hologram laminate", and thus the description thereof is omitted here.

Hereinafter, the configuration and use of the information recording medium of the present invention will be described.

1. 1. Configuration The information recording medium of the present invention has a volume hologram laminate. Further, the information recording medium of the present invention includes a base material arranged on the surface of the volume hologram layer on the support layer side and a printing layer arranged on the same surface as the surface on which the volume hologram laminate of the base material is arranged. You may have it.

Hereinafter, each configuration in the information recording medium of the present invention will be described.

(1) Volume hologram laminate The volume hologram laminate in the present invention is arranged on one surface of the support layer and the support layer, and is opposite to the laser engraving layer and the support layer of the laser engraving layer that develop color by irradiation with laser light. The volume hologram layer is arranged on the side surface and has a volume hologram layer on which interference fringes are recorded, the laser engraving layer has a pattern drawn by irradiation with laser light, and the volume hologram layer has a reproduced image reproduced by the interference fringes. The pattern drawn on the laser engraving layer is characterized in that at least a part of the pattern is the same as the pattern of the reproduced image of the volume hologram layer.

Since the volume hologram laminate used for the information recording medium of the present invention can be the same as the content described in the above-mentioned "A. Volume hologram laminate", the description here is omitted.

(2) Print layer In the present invention, the print layer may be arranged on the same surface as the surface on which the volume hologram laminate of the base material is arranged.

The printed layer in the present invention can have information different from that of the volume hologram laminate. Examples of the information possessed by the print layer include characters, symbols, marks, illustrations, patterns such as characters, company names, product names, selling points, character information such as catch phrases, and the like.

Examples of the material constituting the print layer include general printing inks. Examples of the printing ink include materials containing colorants such as pigments and dyes and binder resins.

The printed layer in the present invention is usually arranged on the same surface as the surface on which the volume hologram laminate of the base material is arranged. Here, the "same surface as the surface on which the volume hologram laminate of the base material is arranged" may be any position as long as it is the surface of the base material on which the volume hologram layer is arranged. That is, the printed layer may be arranged at a position that does not overlap with the volume hologram laminate on the surface of the substrate, or may be arranged at a position that overlaps with the volume hologram laminate on the surface of the substrate. When the print layer is arranged at a position overlapping with the volume hologram laminate on the surface of the substrate, the print layer is, for example, on the surface of the volume hologram laminate opposite to the substrate, with the volume hologram laminate. It may overlap, or it may overlap with the volume hologram laminate between the volume hologram laminate and the base material. When the print layer and the volume hologram layer overlap, the entire area of the print layer may overlap with the volume hologram laminate, or a part of the print layer may overlap with the volume hologram laminate.

The thickness of the print layer in the present invention can be appropriately adjusted according to the use of the information recording medium of the present invention, and is not particularly limited. Therefore, the description of the thickness of the print layer is omitted.

Examples of the printing layer forming method in the present invention include general printing methods such as offset printing, gravure printing, flexo printing, typographic printing, screen printing, inkjet printing, sublimation transfer printing, and melt transfer printing. Further, the print layer may be formed by a transfer method.

(3) Base material The base material in the present invention is a member that supports the above-mentioned volume hologram laminate and the printed layer.

As shown in FIG. 7B, the base material in the present invention may be used as the same member as the support layer 1 in the volume hologram laminate, and although not shown, it is different from the support layer in the volume hologram laminate. It may be a body.

Since the base material in the present invention can be the same as the content described in the above section "A. Volume hologram laminate 1. Configuration (3) Support layer", the description here is omitted.

(4) Other Members The information recording medium of the present invention may have other members, if necessary, in addition to the above-mentioned members.

Examples of other members in the present invention include an antistatic layer, an adhesive layer or an adhesive layer, a mold release layer, a magnetic recording layer, an IC chip, an optical recording layer, and the like, and each layer is timely laminated according to the application. be able to.

2. 2. Uses The information recording medium of the present invention may be used, for example, as gift certificates, securities, stock certificates and other gold tickets, magnetic cards, IC cards and other various cards, tickets, banknotes, passports, identification cards, public competition voting tickets, etc. Can be mentioned.

The present invention is not limited to the above embodiment. The above-described embodiment is an example, and any of the above-described embodiments having substantially the same configuration as the technical idea described in the claims of the present invention and having the same effect and effect is the present invention. Is included in the technical scope of.

1 ... Support layer 2 ... Laser engraving layer 3 ... Volumetric hologram layer 4 ... Overcoat layer 10 ... Volumetric hologram laminate 100 ... Information recording medium

Claims (9)

A support layer, a laser engraving layer arranged on one surface of the support layer and developing a color by irradiation with a laser beam, and an image reproduced by interference fringes arranged on a surface of the laser engraving layer opposite to the support layer. Is a volumetric hologram laminate having a reflective volumetric hologram layer in which is recorded.
The laser engraving layer has a pattern and has a pattern.
The pattern of the laser engraving layer is at least partly the same as the pattern of the reproduced image of the reflective volume hologram layer.
The laser engraving layer is a volume hologram laminate characterized in that a region corresponding to a reproduced image of the reflection type volume hologram layer has an uncolored region. The reproduced image of the reflective volume hologram layer is characterized in that a reproduced image is formed within 40 mm above and below from at least one surface of the volume hologram layer with respect to the reflective volume hologram layer. The described volume hologram laminate. The volume hologram laminate according to claim 1 or 2, wherein the surface of the laser engraving layer opposite to the support layer has an overcoat layer. A reproduction image formed by interference fringes, which is arranged on one surface of the support layer, the laser engraving layer which is arranged on one surface of the support layer and develops color by irradiation with laser light, and the surface of the laser engraving layer on the opposite side of the support layer. A preparatory step for preparing a laminate having a reflective volumetric hologram layer on which
It has a drawing step of irradiating the laser engraving layer with a laser beam through the volume hologram layer to draw a pattern from a reproduction angle at which the reproduced image of the reflection type volume hologram layer can be reproduced.
The laser light used in the drawing step has a wavelength reflected by the reproduced image of the reflective volume hologram layer when the laser light is applied to the laser engraving layer via the reflective volume hologram layer.
A method for manufacturing a volumetric hologram laminate, wherein the pattern drawn on the laser engraving layer by the drawing step is at least partly the same as the pattern of the reproduced image of the reflective volume hologram layer. The volume hologram stacking according to claim 4, wherein the laser light used in the drawing step has a wavelength peak within ± 10 nm of the reproduction wavelength for reproducing the reproduced image of the reflection type volume hologram layer. How to make a body. The method for manufacturing a volume hologram laminate according to claim 4 or 5, wherein the reproduction angle is 60 ° or less with respect to the normal of the reflective volume hologram layer. An information recording medium comprising the volume hologram laminate according to any one of claims 1 to 3. A card comprising the volume hologram laminate according to any one of claims 1 to 3. A passport comprising the volume hologram laminate according to any one of claims 1 to 3.

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