JP2023069716A - Method for manufacturing hologram laminate, hologram laminate, laminate for laser processing, and embedded body for laser processing - Google Patents

Abstract

A method of manufacturing a hologram laminated body is provided, which is capable of adding variable information and increasing the added value of anti-counterfeiting. The present disclosure provides a laser processing laminate manufacturing process for manufacturing a laser processing laminate 10 having a transparent substrate 1 and a metal thin film 2' formed on one side of the transparent substrate. Then, a part of the metal thin film is irradiated with a laser beam L to transform it into a transparent oxide thin film, thereby forming a light shielding portion 2a made of the metal thin film and a patterned light transmitting portion made of the transparent oxide thin film. and a transmission Fourier transform hologram layer forming step of forming a transmission Fourier transform hologram layer 2 having 2b, wherein the transmission Fourier transform hologram layer has the light transmission portion in which light incident from a point light source is patterned. Provided is a method for manufacturing a hologram laminate 100 having a transmission type Fourier transform hologram region that converts into an optical image by transmitting . [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present disclosure relates to a method for manufacturing a hologram laminate, a hologram laminate, a laminate for laser processing, and an embedded body for laser processing.

In recent years, hologram laminates have been widely used for anti-counterfeiting purposes because they are relatively difficult to duplicate and have a beautiful appearance. There are various types of such hologram laminates, depending on the method of recording an original image as interference fringes, the principle of displaying a light image with a hologram, and the like. For example, embossed holograms, volume holograms, electronic holograms, and Fourier transform holograms, which are computer-generated holograms, can be used.

By using such a hologram laminate, authenticity can be identified, and anti-counterfeiting and security functions can be improved. Attempts have also been made to impart designability using a light image displayed by a hologram laminate.

For example, Patent Document 1 discloses a hologram laminate having a reflective Fourier transform hologram region and a transmission Fourier transform hologram region, wherein the reflective Fourier transform hologram region has an uneven surface when light incident from a point light source is applied. It is an area that converts the reflected light reflected by the uneven surface of the first hologram layer having a surface into a first optical image, and the transmission Fourier transform hologram area is arranged in a pattern by light incident from a point light source. discloses a hologram laminate characterized by a region that converts the transmitted light transmitted through the second hologram layer into a second light image. It is described that a hologram laminate having excellent anti-counterfeiting properties and design properties can be displayed.

JP 2018-173463 A

However, in Patent Document 1, the transmission type Fourier transform hologram layer in the laminate has unevenness as a configuration for converting into an optical image, which is information for visual recognition. requires embossing. There are limited facilities equipped for embossing, and the unevenness for embossing must be applied in the process of manufacturing the laminate, so the laminate is in the final process. It becomes difficult to form unevenness for the optical image later. Therefore, in Patent Document 1, the optical image becomes predetermined fixed information.

The present disclosure has been made in view of the above problems, and the main purpose thereof is to provide a method for manufacturing a hologram laminate that can add variable information and increase the added value of anti-counterfeiting. and

One embodiment of the present disclosure includes a laser processing laminate manufacturing process for manufacturing a laser processing laminate having a transparent substrate and a metal thin film formed on one surface side of the transparent substrate; A transmission type Fourier transform hologram having a light-shielding portion made of the metal thin film and a patterned light-transmitting portion made of the transparent oxide thin film by irradiating a part of the thin film with a laser to transform it into a transparent oxide thin film. and a transmission Fourier transform hologram layer forming step of forming a layer, wherein the transmission Fourier transform hologram layer converts light incident from a point light source into a light image by passing through the patterned light transmitting portions. A method for manufacturing a hologram laminate having a transmission Fourier transform hologram area that

In the present disclosure, the laser processing laminate has an uneven structure formed on one surface of the transparent base material, and the metal thin film disposed on the surface of the uneven structure side. It is preferred to have a reflective embossed hologram region that functions as a embossed hologram.

In the present disclosure, the pattern displayed by the optical image reproduced by the transmission Fourier transform hologram area may be a pattern having relevance to the pattern displayed by the embossed hologram area.

In the present disclosure, the laser processing laminate has an uneven structure formed on one surface of the transparent base material, and the metal thin film disposed on the surface of the uneven structure side. It is preferred to have a reflective Fourier transform hologram region that functions as a Fourier transform hologram.

In the present disclosure, the laminate for laser processing preferably has a first adhesive layer disposed on the side of the metal thin film opposite to the transparent substrate side.

In this case, the laminate for laser processing may have a second adhesive layer disposed on the side of the transparent base material opposite to the metal thin film side.

In the present disclosure, after the laser processing laminate manufacturing step, the laser processing laminate is transferred to a first support via the first adhesive layer to manufacture a transfer body, and then the transmissive type The laser irradiation may be performed in the Fourier transform hologram layer forming step.

In the present disclosure, after the step of manufacturing the laminate for laser processing, a first support is arranged on the first adhesive layer side of the laminate for laser processing, and the second adhesive layer side of the laminate for laser processing is disposed. The laser processing laminate is embedded between the first support and the second support by arranging the second support and pressing the first support and the second support together. After manufacturing the embedded body, the laser irradiation in the transmission type Fourier transform hologram layer forming step may be performed.

An embodiment of the present disclosure is a transmissive type having a transparent substrate, a light shielding portion made of a metal thin film, and a patterned light transmission portion made of a transparent oxide thin film, which are arranged on one side of the transparent substrate. and a Fourier transform hologram layer, wherein the transmission Fourier transform hologram layer has a transmission Fourier transform hologram region in which light incident from a point light source is converted into an optical image by passing through the patterned light transmitting portion. A hologram laminate is provided.

The hologram laminate in the present disclosure includes an uneven structure formed on one surface of the transparent base material, the transmission Fourier transform hologram layer disposed on the surface on the uneven structure side, and the transmission Fourier transform hologram layer may have a reflection embossed hologram region in which the light shielding portion made of the metal thin film functions as a reflection embossed hologram.

Further, in the hologram laminate in the present disclosure, the pattern displayed by the optical image reproduced by the transmission Fourier transform hologram area is a pattern having relevance to the pattern displayed by the reflection embossed hologram area. is preferred.

Further, the hologram laminate in the present disclosure includes a concave-convex structure formed on one surface of the transparent substrate, and the transmission Fourier transform hologram layer disposed on the surface on the concave-convex structure side. and the transmission Fourier transform hologram layer may have a reflection Fourier transform hologram region in which the light shielding portion made of the metal thin film functions as a reflection Fourier transform hologram.

The hologram laminate in the present disclosure may have a first adhesive layer on the side of the transmission Fourier transform hologram layer opposite to the transparent substrate side.

In this case, the hologram laminate in the present disclosure may have a first support on the side opposite to the transparent substrate side of the transmission Fourier transform hologram layer.

The hologram laminate in the present disclosure may have a second adhesive layer on the side of the transparent substrate opposite to the transmission Fourier transform hologram layer side.

In this case, the hologram laminate in the present disclosure may have a second support on the side of the transparent substrate opposite to the transmission Fourier transform hologram layer side.

One embodiment of the present disclosure has a transparent substrate and a metal thin film formed on one side of the transparent substrate, and is subjected to laser processing to form a transmission Fourier transform hologram region. provides a laminate for laser processing.

In one embodiment of the present disclosure, a laminate for laser processing having a second adhesive layer, a transparent base material, a metal thin film, and a first adhesive layer in this order includes a first support and a second support. Provided is an embedding body for laser processing, which is an embedding body embedded between and subjected to laser processing to form a transmission type Fourier transform hologram region.

INDUSTRIAL APPLICABILITY In the present disclosure, it is possible to provide a method for manufacturing a hologram laminate that is excellent in anti-counterfeiting effect and design, and capable of imparting variable information.

FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; 1 is a schematic cross-sectional view and a plan view illustrating a hologram laminate in the present disclosure; FIG. FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; 1 is a schematic cross-sectional view of a laminate for laser processing in a method for manufacturing a hologram laminate according to the present disclosure; FIG. FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; FIG. 4A is a schematic cross-sectional view illustrating a method for manufacturing a hologram laminate in the present disclosure; 1 is a schematic cross-sectional view and a plan view illustrating a hologram laminate in the present disclosure; FIG. 1 is a schematic cross-sectional view and a plan view illustrating a hologram laminate in the present disclosure; FIG.

Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be embodied in many different modes and should not be construed as limited to the description of the embodiments exemplified below. In addition, in order to make the description clearer, the drawings may schematically show the width, thickness, shape, etc. of each part compared to the actual form, but this is only an example and limits the interpretation of the present disclosure. not something to do. In addition, in this specification and each figure, the same reference numerals may be given to the same elements as those described above with respect to the existing figures, and detailed description thereof may be omitted as appropriate.

In this specification, when expressing a mode of arranging another member on top of a certain member, when simply describing “above” or “below”, unless otherwise specified, 2 includes both cases in which another member is arranged directly above or directly below, and cases in which another member is arranged above or below a certain member via another member. In addition, in this specification, when expressing a mode in which another member is arranged on the surface of a certain member, unless otherwise specified, when simply described as “on the surface”, it means directly above, so as to contact the certain member, unless otherwise specified. Alternatively, it includes both the case of arranging another member directly below and the case of arranging another member above or below a certain member via another member.

In this specification, the term "sheet" also includes a member called "film". The term "film" also includes members called "sheets". Further, in this specification, the hologram layer includes a layer having a function of converting light incident from a point light source into a desired optical image, and is limited to a layer having an uneven structure on the surface in order to have the function. However, it also includes a single layer structure that does not have an uneven structure.

A method for manufacturing a hologram laminate according to the present disclosure will be described in detail below.

A. Method for Manufacturing Hologram Laminate FIG. 1 shows a schematic cross-sectional view for explaining the method for manufacturing a hologram of the present disclosure.
The method for manufacturing a hologram laminate of the present disclosure comprises a step of manufacturing a laser processing laminate 10 having at least a transparent substrate 1 and a metal thin film 2' formed on one side of the transparent substrate 1 ( As shown in FIG. 1(A), a part of the metal thin film 2' is irradiated with a laser beam L to be modified into a transparent oxide thin film, thereby forming a light shielding portion 2a made of the metal thin film and the transparent oxide thin film. and a step of forming a transmission Fourier transform hologram layer having a transmission Fourier transform hologram region having a patterned light transmission portion 2b (FIG. 1(B)), wherein the transmission Fourier transform hologram region is and a region for converting light incident from a point light source and transmitted through the patterned light transmitting portion into a first light image.

According to the method for producing a hologram laminate in the present disclosure, a laminate for laser processing is produced, and then a transmission type Fourier transform hologram region is formed by laser irradiation, so variable information can be given, and security can be achieved. It is possible to increase the added value of anti-counterfeiting. In particular, variable information can be imparted afterward by transferring or embedding the laminate for laser processing into a support, for example, as a card, and then irradiating it with a laser.

FIG. 2 is an explanatory diagram for explaining the hologram laminate in the present disclosure. As shown in FIG. 2A, the transmission Fourier transform hologram region in the hologram laminate 100 according to the present disclosure is a region in which a Fourier transform image is recorded by Fourier transforming an original image in which a predetermined pattern is drawn. is. Light incident from a point light source 22 arranged on the opposite side of the observer 21 is blocked by the light shielding portion 2a of the transmission Fourier transform hologram layer 2 to form a patterned light transmission portion 2b which is a transparent oxide film layer. can be converted into an optical image Ia as shown in FIG. 2(B).

A “transmission Fourier transform hologram layer” in the present disclosure is a layer having a transmission Fourier transform hologram region having a light shielding portion made of a metal thin film and a light transmitting portion made of a transparent oxide thin film formed by laser irradiation.
Such a transmission Fourier transform hologram layer is different from a layer (surface phase type transmission Fourier transform hologram layer) that converts a desired optical image by a surface uneven structure. It is a layer having a transmission type Fourier transform hologram region that transforms into a desired optical image.

1. Step of Manufacturing Laminate for Laser Processing This step is a step of manufacturing a laminate for laser processing having at least a transparent base material and a metal thin film formed on one side of the transparent base material. This step will be described in detail below.

(1) Transparent substrate First, the transparent substrate used in this step will be described. The transparent base material in the present disclosure preferably has a visible light transmittance of 80% or more, more preferably 90% or more. Since the visible light transmittance of the transparent substrate is within the above range, when light is irradiated from the opposite side of the hologram laminate to the side where the transparent substrate is arranged, the light is converted by the transmission type Fourier transform hologram area. A light image can be displayed through a transparent substrate.
The visible light transmittance of the transparent substrate can be measured, for example, by a test method for total light transmittance of plastic-transparent substrate conforming to JIS K7361-1.

The transparent substrate in the present disclosure preferably has a relatively low haze value. As a specific haze value of the transparent substrate, for example, it is preferably in the range of 0.01% or more and 5% or less, and more preferably in the range of 0.01% or more and 3% or less. , 0.01% or more and 1.5% or less. When the haze value of the transparent substrate is within the above range, an optical image can be satisfactorily displayed through the transparent substrate.
The haze value of the transparent substrate can be measured according to JIS K 7136, for example.

As the material for the transparent substrate in the present disclosure, it is preferable to select a material having a predetermined visible light transmittance and haze value as described above. Specific examples include resin films such as polyethylene terephthalate, polycarbonate, acrylic resin, cycloolefin resin, polyester resin, polystyrene resin, and acrylic styrene resin, and glass such as quartz glass, Pyrex (registered trademark), and synthetic quartz plate. In the present disclosure, it is preferable to use a resin film from the viewpoint of light weight and low risk of breakage, etc., and it is more preferable to select polyethylene terephthalate from the viewpoint of versatility.

The transparent substrate in the present disclosure may contain ultraviolet absorbers, heat absorbers, and the like. It is possible to suppress deterioration of the hologram layer due to exposure of the hologram laminate to ultraviolet rays, heat rays, and the like.

The thickness of the transparent substrate in the present disclosure is preferably such that it has sufficient rigidity and strength to support the hologram layer. The thickness of the transparent substrate is, for example, preferably in the range of 5 μm or more and 1 mm or less, and more preferably in the range of 5 μm or more and 200 μm or less. Further, the shape of the transparent base material can be appropriately changed according to the usage pattern of the hologram laminate of the present disclosure.
Specifically, both surfaces may be flat as shown in FIG. 1 and the like, or a hologram layer having an uneven structure formed on one surface may be used.

The transparent substrate in the present disclosure may be subjected to surface treatment in order to improve adhesion with other members. Examples of the surface treatment of the transparent substrate include corona treatment.

(2) Metal thin film Next, the metal thin film formed on one side of the transparent substrate will be described. The material of the metal thin film is particularly a metal material that can block light incident from a point light source and that can be oxidized by laser irradiation and transformed into a transparent oxide layer. It is not limited. Examples include aluminum, zinc, indium, tin, and titanium. Among them, aluminum is preferable. As will be described later, the metal thin film preferably functions as a reflective layer arranged on the uneven structure side of the embossed hologram area and the reflection type Fourier transform hologram area.

The thickness of the metal thin film is, for example, preferably 10 nm or more and 2 μm or less, more preferably 20 nm or more and 100 nm or less. If the thickness of the metal thin film is too thin, depending on the material of the metal thin film, the spectral transmittance of the light shielding portion of the metal thin film may increase at a specific wavelength, and the light incident from the point light source may not be sufficiently shielded. Also, if the thickness of the metal thin film is too thick, it may become difficult to form the light transmitting portion.

Methods for forming a metal thin film on one side of the transparent substrate include, for example, a vacuum deposition method and a sputtering method. Appropriate conditions for the thin film may be set according to the color tone, design, application, and the like.

(3) Layered product for laser processing The layered product for laser processing becomes an object to be irradiated with a laser in the next step of forming a transmission Fourier transform hologram layer. The laminate for laser processing may be subjected to the next step as it is, but may be transferred to a first support to be described later as a transfer body, or may be embedded between the first support and the second support. It may be supplied to the next step as a body.

In this step, a laminate having at least the transparent substrate and a metal thin film disposed on one side of the transparent substrate is produced as a laminate for laser processing. You may manufacture as what contains the layer which has the function of.

(a) Reflective embossed hologram region The laminate for laser processing manufactured in this step includes the uneven structure for the reflective embossed hologram formed on one surface of the transparent substrate and the uneven structure for the reflective embossed hologram formed on one surface of the transparent substrate. and a metal thin film disposed on the surface of the reflective embossed hologram region that functions as a reflective embossed hologram.

As a specific method of this step in this case, as shown in FIG. (FIG. 3(A)), and a reflective embossed hologram area is formed by forming a metal thin film 2' on the surface of the uneven structure 3 (FIG. 3(B)). The reflective embossed hologram area will be described later in "B. Hologram laminate 2. Other hologram areas (1) Reflective embossed hologram area".
In the present disclosure, the concave-convex structure for a reflective embossed hologram and the transparent substrate may be integrally formed.

(b) Reflective Fourier transform hologram region The laminate for laser processing manufactured in this step includes a concave-convex structure for a reflective Fourier transform hologram formed on one surface of the transparent base material, and the uneven structure for a reflective Fourier transform hologram. and a metal thin film arranged on the surface on the side of the uneven structure to have a reflective Fourier transform hologram region that functions as a reflective Fourier transform hologram.

As a specific method of this step in this case, as shown in FIG. (FIG. 4(A)), and by forming a metal thin film 2' on the concave-convex structure 4, a reflection type Fourier transform hologram can be obtained (FIG. 4(B)). The reflective Fourier transform hologram area will be described later in "B. Hologram laminate 2. Other hologram layers (2) Reflective Fourier transform hologram area".

(c) First Adhesive Layer and Second Adhesive Layer As shown in FIG. The laminated body 10A having the first adhesive layer 5a may be used. That is, the laminate 10A has the transparent substrate 1, the metal thin film 2', and the first adhesive layer 5a in this order. Such a layered product 10A can be used as a transfer layered product for transferring to a first support which will be described later. In addition, in FIG. 5A, a primer layer 6 is formed between the metal thin film 2' and the first adhesive layer 5a.

Further, as shown in FIG. 3C1, the laminate for laser processing is a laminate 10A having a transparent substrate 1, a reflective embossed hologram concavo-convex structure 3, a metal thin film 2', and a first adhesive layer 5a in this order. may be

Further, as shown in FIG. 4C1, the laminate for laser processing is a laminate having a transparent base material 1, a concave-convex structure 4 for a reflective Fourier transform hologram, a metal thin film 2', and a first adhesive layer 5a in this order. It may be the body 10A.

As shown in FIG. 5(B), in addition to the first adhesive layer 5a, the laser processing laminate 10 has a second adhesive layer 5b on the opposite side of the transparent substrate 1 to the metal thin film 2' side. The laminated body 10B may have. That is, the laminate 10B has the second adhesive layer 5b, the transparent substrate 1, the metal thin film 2', and the first adhesive layer 5a in this order. Such a laminate 10B can be used as an embedding laminate to be embedded between a first supporter described later and a second supporter described later. Depending on the type of the second support, the second adhesive layer need not be provided when the laminate for laser processing has excellent adhesion to the transparent substrate.

Further, as shown in FIG. 3C2, the laminate for laser processing includes a second adhesive layer 5b, a transparent substrate 1, a reflective embossed hologram concavo-convex structure 3, a metal thin film 2', and a first adhesive layer 5a. The laminated body 10B may be arranged in this order.

Further, as shown in FIG. 4C2, the laminate for laser processing includes a second adhesive layer 5b, a transparent substrate 1, a concave-convex structure 4 for a reflective Fourier transform hologram, a metal thin film 2', and a first adhesive layer. A laminate 10B having 5a in this order may be used.

(d) Other layers The other layers of the laminate for laser processing in this step are not particularly limited, and are configured to have desired functions according to the application and manufacturing method of the hologram laminate of this embodiment. can be used. Optional structures include, for example, 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, a separator, and the like are included.

(e) Laminate for Transfer and Laminate for Embedding As described above, the laminate 10A having the first adhesive layer 5a on its surface can be used as a laminate for transfer. In this case, after the laminate 10A for laser processing is manufactured in this step (FIG. 6A), the laminate 10A is adhered to the first support 7a described later with the first adhesive layer 5a and transferred, A transfer member 50 for laser processing is obtained (FIG. 6(B)). After that, it is subjected to the next step (FIG. 6(C)).

As shown in FIG. 6B, the laser processing transfer body 50 has a first support 7a and the transfer layered body 10A. Specifically, the laser processing transfer body 50 has a first support 7a, a first adhesive layer 5a, a metal thin film 2', and a transparent substrate 1 in this order.

Moreover, the laminate 10B having the first adhesive layer 5a and the second adhesive layer 5b can be used as an embedding laminate. In this case, after the laminate for laser processing 10B is produced in this step (FIG. 7A), laser processing is performed with the first adhesive layer 5a side of the laminate for laser processing 10B as the side of the first support 7a. With the second adhesive layer 5b side of the laminate for laser processing 10B facing the second support 7b, the laminate for laser processing 10B is embedded between the first support 7a and the second support 7b. Let it be the body 51 (FIG. 7(B)). After that, it is subjected to the next step (FIG. 7(C)).

As shown in FIG. 7B, the laser processing embedding body 51 has a first support 7a, the embedding laminate 10B, and a second support 7b. Specifically, the embedding member 51 includes a first support 7a, a first adhesive layer 5a, a metal thin film 2', a transparent substrate 1, a second adhesive layer 5b, and a second support 7b in this order. have.

The first support and the second support are, for example, members that serve as the base of the card, and include core sheets. Examples of the core sheet include resin sheets such as polyethylene terephthalate (PET), amorphous polyethylene terephthalate (PET-G), polyvinyl chloride (PVC), polycarbonate (PC), and laminates of these resin sheets. be done. The outline of the core sheet is the same as the outline of the card.

2. Transmission type Fourier transform hologram layer forming process In this process, as shown in FIG. In the step of forming a transmission Fourier transform hologram layer 2 having a transmission Fourier transform hologram region having a light shielding portion 2a made of a metal thin film and a patterned light transmission portion 2b made of a transparent oxide thin film, by modifying the be.

In FIG. 1, the metal thin film 2' is irradiated with the laser beam L from the side opposite to the transparent substrate 1 side, but the laser beam L may be irradiated from the transparent substrate 1 side.

When the laminate for laser processing has a reflective embossed hologram region, as shown in FIGS. becomes a transmission type Fourier transform hologram layer 2 having a light shielding portion 2a made of a metal thin film and a patterned light transmission portion 2b made of a transparent oxide thin film. In this case, in the transmission Fourier transform hologram region of the transmission Fourier transform hologram layer 2, the portions (2a, 3) having the function of the reflection embossed hologram and the portion (2b) having the function of the transmission Fourier transform hologram are provided. A hologram laminate that exists in a mixed state is obtained.

When the laminate for laser processing has a reflective Fourier transform hologram region having an uneven structure, as shown in FIGS. The metal thin film 2' becomes a transmission type Fourier transform hologram layer 2 having a light shielding portion 2a made of the metal thin film and a patterned light transmission portion 2b made of a transparent oxide thin film. In this case, in the transmission Fourier transform hologram region of the transmission Fourier transform hologram layer 2, there are a portion (2a, 4) having a function of a reflection Fourier transform hologram and a portion (2b) having a function of a transmission Fourier transform hologram. It becomes a hologram laminate that exists in a mixed state.

As a method for obtaining a transmission type Fourier transform hologram region, a light shielding portion and a light transmission portion are arranged in a pattern so that a desired optical image can be displayed when light from a point light source is transmitted. , perform laser irradiation. Since variable pattern formation can be performed, it is possible to form a hologram laminate having high anti-counterfeiting properties and excellent design.
As a condition for forming a light-transmitting portion made of a transparent oxide thin film on a metal thin film by laser irradiation, the laser used must be capable of marking by reacting with the metal. Examples include YAG laser, YVO laser, fiber laser, green laser, and UV laser.

(1) Transmission Fourier transform hologram region The transmission Fourier transform hologram region in the present disclosure is a pattern that is a transparent oxide film layer by blocking light incident from a point light source with a light blocking portion of the transmission Fourier transform hologram layer. It is an area that converts the light transmitted through the shaped light transmitting portion into a light image. That is, the transmission type Fourier transform hologram area in the present disclosure functions as a Fourier transform lens. Note that the above function may be referred to as a Fourier transform lens function and described.

A transmission type Fourier transform hologram area in the present disclosure is a Fourier transform image that is multi-valued based on data of an original image displayed as an optical image. The light-shielding portion and the light-transmitting portion are generally composed of a large number of curved or linear patterns extending in parallel in a specific direction.

The planar view size of the transmission Fourier transform hologram region is not particularly limited and can be appropriately adjusted according to the application of the hologram laminate of the present disclosure. A specific planar view size of the transmission Fourier transform hologram region is, for example, preferably within the range of 5 mm square or more and 50 mm square or less, more preferably within the range of 5 mm square or more and 30 mm square or less, particularly 5 mm. It is preferably within the range of 15 mm square or less. When the planar view size of the transmission Fourier transform hologram area is the above lower limit, the optical image converted by the transmission Fourier transform hologram area becomes easier to visually recognize. In addition, the transmissive Fourier transform hologram region can improve anti-counterfeiting properties and provide excellent design. On the other hand, the planar view size of the transmission type Fourier transform hologram area is the above upper limit, so that the hologram laminate of the present disclosure can be manufactured at low cost. In addition, it is possible to easily form a print layer for displaying a combination of a predetermined image with the optical image converted by the transmission type Fourier transform hologram area.

Here, the plane-view size of the transmission Fourier transform hologram region is 5 mm square or more means that the plane view size of the transmission Fourier transform hologram region includes at least a 5 mm square area. Therefore, for example, when the transmission Fourier transform hologram area is rectangular, it means that the short side has a length of 5 mm or more. It means that the length of one side is 5 mm or more.

In the present disclosure, the planar view shape of the transmission Fourier transform hologram region can be appropriately selected as an arbitrary shape according to the application of the hologram laminate of the present disclosure. Examples include rectangular shapes such as squares and rectangles, polygonal shapes such as trapezoidal shapes, triangular shapes, pentagonal shapes, and hexagonal shapes, circular shapes, elliptical shapes, star shapes, and heart shapes. A rectangular shape is preferable from the viewpoint that it is possible to

(2) Light shielding part The transmission type Fourier transform region in the present disclosure has a light shielding part made of a metal thin film and a light transmission part made of a transparent oxide thin film. The light shielding portion is made of a metal thin film. The metal thin film has been described in "1. Laminate production process for laser processing (2) Metal thin film", so the description is omitted here.

The light shielding portion in the transmission Fourier transform hologram region has a function of pattern-wise shielding the light incident from the point light source. In the present disclosure, light incident from a point light source is blocked by a transmission Fourier transform hologram layer in a pattern and converted into a light image. Here, "shielding" includes not only the case of completely shielding the light incident from the point light source, but also the case of shielding the light to the extent that it can be converted into an optical image.

Specifically, the spectral transmittance of a specific wavelength in the light shielding portion is preferably 60% or less, more preferably 40% or less, and particularly preferably 10% or less.

Here, the specific wavelength is a reproduction wavelength of the transmission type Fourier transform hologram layer, and is a wavelength in a part of the visible light region.

The spectral transmittance of the specific wavelength in the light shielding portion means the spectral transmittance of the specific wavelength in the region where the light shielding portion is arranged in the hologram laminate. For example, in a hologram laminate having a transparent substrate and a transmission type Fourier transform hologram layer, it is the spectral transmittance of a specific wavelength in the region where the light shielding portion is arranged.

(3) Light-transmitting portion The light-transmitting portion is made of a transparent oxide thin film and transmits light. The presence of an oxide thin film can be confirmed by detecting an oxide (for example, Al ₂ O ₃ ) in an X-ray photoelectron spectroscopy or an energy dispersive X-ray fluorescence spectrometer. For example, the proportion of oxide (for example, Al ₂ O ₃ ) in the light transmitting portion is 80% or more, and may be 90% or more. On the other hand, the proportion of unoxidized metal (for example, metal Al) is 20% or less, and may be 10% or less.

In the light transmission portion of the transmission Fourier transform hologram layer, the spectral transmittance of the specific wavelength is, for example, preferably 80% or more, more preferably 90% or more, and even more preferably 95% or more. . When the spectral transmittance of the specific wavelength in the light transmitting portion is within the above range, it is possible to facilitate observation of the reproduced image by the transmission type Fourier transform hologram layer.

The spectral transmittance of the specific wavelength in the light transmitting portion of the transmission Fourier transform hologram layer refers to the spectral transmittance of the specific wavelength in the region where the light transmitting portion of the transmission Fourier transform hologram layer is arranged. For example, in a hologram laminate having a transparent base material and a transmission type Fourier transform hologram layer, it is the spectral transmittance of a specific wavelength in the region where the light transmitting portion is arranged.

(4) First Optical Image The optical image displayed by the transmission Fourier transform hologram area in the present disclosure includes, for example, characters, figures, symbols, or combinations thereof. In addition to simple graphics such as polygons, circles, ellipses, and stars, the graphics include stripes, grids, patterns, bar codes, two-dimensional codes, and the like.

In particular, variable information such as name, ID, serial number, bar code, two-dimensional code, etc. can be given to each hologram laminate, and the hologram laminate can be used as a variable information recording medium.

(5) Others In the present disclosure, as a point light source that irradiates the transmission Fourier transform hologram area with light, for example, a light of a smartphone terminal can be used.

The wavelength of the point light source is not particularly limited, and it is preferable that the transmission type Fourier transform hologram region can satisfactorily exhibit the Fourier transform lens function. Specifically, light including visible light can be used. In the present disclosure, the wavelength of the point light source may be monochromatic light with one wavelength, light including multiple wavelengths, or white light.

3. Hologram Laminate The hologram laminate produced in the present disclosure will be described in "B. Hologram Laminate" below.

B. Hologram Laminate FIG. 2 is an explanatory diagram for explaining a schematic cross-sectional view of the hologram laminate of the present disclosure and the resulting structure. The hologram laminate 100 of the present disclosure includes a transparent substrate 1, and a light shielding portion 2a made of a metal thin film and a patterned light transmission portion 2b made of a transparent oxide thin film, which are arranged on one side of the transparent substrate 1. It is characterized by having a transmission type Fourier transform hologram layer 2 having a

With such a hologram laminate, the hologram laminate is excellent in anti-counterfeiting effect and designability, and capable of imparting variable information. For example, variable information such as name, ID, serial number, bar code, two-dimensional code, etc. can be given to each hologram laminate, and the hologram laminate can be used as a variable information recording medium.

1. Transmission Fourier Transform Hologram Area The transmission Fourier transform hologram area possessed by the hologram laminate in the present disclosure has been described in detail in the above "A. Hologram laminate manufacturing method 2. Transmission Fourier transform hologram layer forming step", so here is omitted.

2. Other hologram regions (1) Reflective embossed hologram region As shown in FIG. 10, the hologram laminate in the present disclosure is a reflective embossed hologram having a transparent substrate 1, a reflective embossed hologram concavo-convex structure 3, and a light shielding portion 2a. It is preferred to have a hologram area.

With such a hologram laminate 100, when the observer 21 observes it from the front, it is reflected by the light shielding portion 2a of the reflective embossed hologram area, and the second optical image Ib can be confirmed.

Next, when an observer makes light from a point light source enter the hologram laminate 100 from the back side and observes the hologram laminate from the front, the light is transmitted in a pattern by the transmission portion 2b of the transmission type Fourier transform hologram region, and converted. The first optical image Ia thus obtained can be confirmed (eg, FIG. 2). By confirming the predetermined optical image in this way, the observer can confirm the authenticity.

The reflective embossed hologram area in the present disclosure is an area that generally overlaps with the above-described transmission Fourier transform hologram area in plan view. In the present disclosure, the entire surface of the reflective embossed hologram area may overlap the transmission Fourier transform hologram area in a plan view, or part of the reflective embossed hologram area may overlap the transmission Fourier transform hologram area in a plane. They may overlap visually.

Moreover, since the hologram laminate 100 has the reflective embossed hologram area in this way, the design is excellent. Furthermore, since at least a part of the transmission Fourier transform hologram area overlaps the reflection embossed hologram area, the reflection embossed hologram area causes the transmission Fourier transform hologram area (i.e., laser-processed area) to overlap. is hidden, making its existence difficult to understand. In this case, the pattern displayed by the first optical image reproduced by the transmissive Fourier transform hologram area can be a pattern related to the pattern of the second optical image displayed by the embossed hologram area.
In the present disclosure, "related pattern" means, for example, a specific example of a combination of (a pattern displayed by a reflective embossed hologram area and a pattern reproduced by a transmissive Fourier transform hologram area) is (logo, ID number), (national flag, initials), and the like.

The pattern of the second light image displayed by the reflective embossed hologram area in the present disclosure can be, for example, patterns, line drawings, characters, graphics, symbols, etc., and can be appropriately selected according to the application of the hologram laminate. can be done. In the present disclosure, the second optical image displayed by the embossed hologram area may have the same pattern as the first optical image displayed by the transmission Fourier transform hologram area, or may have different patterns. .

(2) Reflective Fourier transform hologram area As shown in FIG. 11, the hologram laminate in the present disclosure has a transparent substrate 1, a reflective Fourier transform hologram concavo-convex structure 4, and a reflective embossed hologram area having a light shielding part 2a. It is preferred to have

The hologram laminate 100 of the present disclosure has the above-described transmission Fourier transform hologram region, so that the light from the point light source can be transmitted and the first optical image Ia can be displayed (for example, FIG. 2). By having the reflection type Fourier transform hologram area, the light from the point light source can be reflected to display the third optical image Ic (FIG. 11(B)). Therefore, when the point light source is irradiated from the side where the observer visually recognizes, the light from the point light source is reflected by the reflection type Fourier transform hologram area and enters the observer's eyes. Therefore, the observer can visually recognize the third optical image.

On the other hand, when the point light source is irradiated from the side opposite to the side viewed by the observer, the light from the point light source passes through the transmission type Fourier transform hologram area and enters the observer's eyes. Therefore, the observer can visually recognize the first optical image. In this way, the hologram laminate of the present disclosure can display a predetermined optical image according to the irradiation direction of the observer.

Therefore, for example, if the first optical image or the third optical image is not known to be displayed, it is difficult to visually recognize the first optical image or the third optical image. It can exhibit anti-counterfeiting properties and is suitable for authenticity determination. Further, the hologram laminate of the present disclosure can display the first optical image and the third optical image.
Therefore, for example, the patterns displayed by the first optical image and the pattern displayed by the third optical image are designed to have a single meaning. , the hologram laminate can exhibit higher anti-counterfeiting properties and is suitable for authenticity determination.

The reflective Fourier transform hologram region in the present disclosure is a region where light incident from a point light source is reflected by the light shielding portion 2a arranged on the surface of the concave-convex structure 4, and the reflected light is converted into a third light image.

The reflective Fourier transform hologram region in the present disclosure diffracts light incident from a point light source in a plurality of directions due to the concave-convex structure for the reflective Fourier transform hologram and the metal thin film, and transforms it into a desired third light image based on the original image. can be converted. That is, the reflective Fourier transform hologram area in the present disclosure functions as a Fourier transform lens. Note that the above function may be referred to as a Fourier transform lens function and described.

The planar view size of the reflective Fourier transform hologram region can be appropriately adjusted according to the application of the hologram laminate of the present disclosure, and is not particularly limited. A specific planar view size of the reflective Fourier transform hologram region is, for example, preferably within the range of 5 mm square or more and 50 mm square or less, more preferably within the range of 5 mm square or more and 30 mm square or less, particularly 5 mm. It is preferably within the range of 15 mm square or less. When the planar view size of the reflective Fourier transform hologram area is the above lower limit, the third optical image converted by the reflective Fourier transform hologram area becomes easier to visually recognize. In addition, the reflective Fourier transform hologram region can improve anti-counterfeiting properties and provide excellent design. On the other hand, since the plane view size of the reflection type Fourier transform hologram region is the above upper limit, the hologram laminate of the present disclosure can be manufactured at low cost.

Here, the planar view size of the reflective Fourier transform hologram area of 5 mm square or more means that the reflective Fourier transform hologram area has a planar view shape including at least a 5 mm square area. Therefore, for example, when the reflective Fourier transform hologram area is rectangular, it means that the length of the short side is 5 mm or more. It means that the length of one side is 5 mm or more. In the present disclosure, the planar view shape of the reflective Fourier transform hologram region can be appropriately selected as an arbitrary shape according to the application of the hologram laminate of the present disclosure. Specific planar shapes include, for example, rectangular shapes such as squares and rectangles, polygonal shapes such as trapezoidal shapes, triangular shapes, pentagonal shapes, and hexagonal shapes, circular shapes, elliptical shapes, star shapes, heart shapes, and the like. However, a rectangular shape is preferable from the viewpoint that it can be easily formed.

The reflective Fourier transform hologram region in the present disclosure is a region that generally overlaps with the above-described transmission Fourier transform hologram region in plan view. In the present disclosure, the entire surface of the reflective Fourier transform hologram region may overlap the later-described transmission Fourier transform hologram region in a plan view, or a part of the reflective Fourier transform hologram region may overlap the later-described transmission-type Fourier transform hologram region. It may overlap with the Fourier transform hologram area in plan view.

The concave-convex structure arranged in the reflective Fourier transform hologram region in the present disclosure is a Fourier transform image multi-valued based on the data of the original image displayed as the third optical image.

Methods for obtaining the reflection-type Fourier transform hologram region in the present disclosure include, for example, the following methods. That is, a master original plate having an uneven structure corresponding to a Fourier transform image is formed. Next, there is a method of forming a coating film by applying a resin material such as an ultraviolet curable resin on a base material such as polyethylene terephthalate, and then transferring the concave-convex pattern of the master original plate to the coating film. mentioned.

Further, examples of the method for forming the master original plate described above include the following methods. That is, a Fourier transform image is formed by calculation based on the image data of the original image. Next, the data of the Fourier transform image is multi-valued into two or more values, converted into electron beam drawing data, and the electron beam drawing data is arranged within a desired range. Specifically, a predetermined number of electron beam drawing data are arranged vertically and horizontally. Next, based on the arrayed electron beam drawing data, there is a method of creating a master original using an electron beam drawing apparatus.

In the present disclosure, for example, when the data obtained by binarizing the data of the Fourier transform image is converted into data for electron beam drawing to create a master plate, the concave-convex structure obtained using the master plate is shown in FIG. 11 ( As shown in A), it has a two-step uneven shape. On the other hand, when the data obtained by converting the data of the Fourier transform image into quaternarized data is converted into data for electron beam drawing to prepare a master plate, the concave-convex structure obtained using the master plate has a four-level concave-convex shape. It should be noted that even in the case of quaternarization, there are cases where a part has a one-step or two-step concave-convex shape. In the present disclosure, when the data of the Fourier transform image is multi-valued, it is preferable to use quaternarization or higher. In other words, it is preferable that the concave-convex structure for the reflection type Fourier transform hologram has four or more steps. This is because the second optical image with a more complicated pattern can be displayed.

Examples of materials for the concave-convex structure for a reflection Fourier transform hologram in the present disclosure include resin materials used for forming general relief holograms. Specific resin materials include, for example, thermosetting resins, thermoplastic resins, ultraviolet curable resins, and ionizing radiation curable resins.

The reflective Fourier transform hologram region in the present disclosure is a region in which light incident from a point light source is reflected by a metal thin film formed on the surface of the concave-convex structure for a reflective Fourier transform hologram and converted into a third light image. .

The pattern of the third light image displayed by the reflective Fourier transform hologram region in the present disclosure can be, for example, a pattern, line drawing, character, figure, symbol, etc., and is appropriately selected according to the application of the hologram laminate. be able to. In the present disclosure, the third optical image displayed by the reflection Fourier transform hologram area may have the same pattern as the first optical image displayed by the transmission Fourier transform hologram area, or may have different patterns. can be

3. Other configurations (1) First adhesive layer and second adhesive layer The hologram laminate in the present disclosure may have the first adhesive layer on the side opposite to the transparent substrate side of the transmission Fourier transform hologram layer. good. In this case, the hologram laminate may have a second adhesive layer on the side of the transparent substrate opposite to the transmission Fourier transform hologram layer side. Specifically, as shown in FIG. 10A, the hologram laminate 100 includes a first adhesive layer 5a on the side of the transmission Fourier transform hologram layer 2 opposite to the uneven structure 3 for reflection embossed hologram. Further, the transparent base material 1 may have a second adhesive layer 5b on the side opposite to the concave-convex structure 3 for a reflective embossed hologram.
Further, as shown in FIG. 11A, the hologram laminate 100 has a first adhesive layer 5a on the side of the transmission Fourier transform hologram layer 2 opposite to the uneven structure 4 for the reflection Fourier transform hologram. Alternatively, the transparent substrate 1 may have a second adhesive layer 5b on the opposite side of the uneven structure 4. As shown in FIG.

A heat sealing agent is used as the adhesive constituting the first adhesive layer and the second adhesive layer.

The heat sealant contains a thermoplastic resin. The thermoplastic resin is not particularly limited, and is appropriately selected according to the type of member to be adhered. Examples of thermoplastic resins include maleic acid-modified vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyamide resin, polyester resin, polyethylene resin, ethylene-isobutyl acrylate. Copolymers, butyral resins, polyvinyl acetate and its copolymers, ionomer resins, acid-modified polyolefin resins, (meth)acrylic resins such as acrylic and methacrylic resins, acrylic acid ester resins, ethylene-(meth) Acrylic acid copolymer, ethylene-(meth)acrylic acid ester copolymer, polymethyl methacrylate resin, cellulose resin, polyvinyl ether resin, polyurethane resin, polycarbonate resin, polypropylene resin, epoxy resin, phenolic resin, vinyl resin 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 copolymer (SEBS), styrene ethylene propylene styrene block copolymer (SEPS) and the like. The thermoplastic resin may be used singly or in combination of two or more.

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

When a heat sealant is used for the first adhesive layer and the second adhesive layer, the thickness of the first adhesive layer and the second adhesive layer is not particularly limited, and is appropriately selected according to the type of member to be adhered. However, for example, it 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. Also, if the thicknesses of the first adhesive layer and the second adhesive layer are too thick, the heating temperature during transfer will be too high, and other members may be damaged.

When the heat sealant 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 multiple layers. In the case of multiple layers, layers having the same composition may be laminated, or layers having different compositions may be laminated.

(2) First Support and Second Support The hologram laminate in the present disclosure can have the first support on the opposite side of the transmission Fourier transform hologram layer from the transparent substrate side. Specifically, as shown in FIG. 10A, the hologram laminate 100 includes a first adhesive layer 5a, The first support 7a may be provided in this order, and the second adhesive layer 5b and the second support 7b are provided in this order on the opposite side of the transparent substrate 1 from the embossed hologram layer 3. may
Further, as shown in FIG. 11(A), the hologram laminate 100 includes a first adhesive layer 5a, a first adhesive layer 5a, and a first adhesive layer 5a on the side of the transmission Fourier transform hologram layer 2 opposite to the concave-convex structure 4 for the reflection Fourier transform hologram. The support 7a may be provided in this order, and the second adhesive layer 5b and the second support 7b may be provided on the opposite side of the transparent substrate 1 from the concave-convex structure 4. FIG.

In this case, for example, the hologram laminate 100 can be used as an information recording medium such as a card by using the above-described core sheets as the first support and the second support.

(3) Near-infrared absorbing substrate layer The hologram laminate in the present disclosure includes a near-infrared absorbing layer containing a near-infrared absorbing material and a near-infrared absorbing A near-infrared absorbing substrate layer containing material may be included. The near-infrared absorptive material includes cesium tungsten oxide or lanthanum hexaboride, and by applying laser light to a target portion of the near-infrared absorptive substrate, the near-infrared absorptivity of the target portion is increased at least in a predetermined wavelength range. characters, images, etc., which can be recognized using an infrared camera or the like, are formed on the near-infrared absorbing ink layer.

A hologram laminate having a transmission Fourier transform hologram layer and a near-infrared absorbing substrate layer or a near-infrared absorbing layer in the present disclosure has variable information recorded by laser processing. This has the effect of providing a laminate with even higher security. A clear window may be provided at a position that overlaps the transmission Fourier transform hologram area in plan view. Clear windows are made from transparent materials such as PVC (polyvinyl chloride), PET-G (amorphous polyester), PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene). For example, it can be produced by partially opening a part of the base material layer according to the shape of the clear window, pouring a transparent resin having visible light transmittance into the space thus created, and curing the resin.

For example, a clear window portion is provided on an information page (also called a data page) for recording personal information in a passport booklet. By arranging a laser-processed embedding body with a metal thin film in a position that overlaps the clear window part in plan view, the light image seen when the light incident from the point light source is transmitted through the clear window part and the light seen when it is reflected. image can be different. In addition, the transmitted light image may indicate the unique (initials, etc.) information of the owner.

4. Hologram Laminate The hologram laminate in the present disclosure can be used for information recording media such as cards, ID cards such as identification cards, and the like.

C. Laminate for laser processing and embedded body for laser processing In the present disclosure, a transparent substrate and a metal thin film formed on one surface side of the transparent substrate are provided to form a transmission Fourier transform hologram region. Provided is a laminate for laser processing, which is subjected to laser processing for the purpose of laser processing.

Further, in the present disclosure, a laminate for laser processing having a second adhesive layer, a transparent base material, a metal thin film, and a first adhesive layer in this order is formed by connecting the first support and the second support. Provided is an embedding body for laser processing, which is an embedding body embedded in between and is subjected to laser processing to form a transmission Fourier transform hologram region.

FIG. 1(A) is a schematic cross-sectional view of a laminate for laser processing according to the present disclosure. FIG. 7(B) is a schematic cross-sectional view of an embedding body for laser processing according to the present disclosure. In these laser processing laminated body and laser processing embedding body, the metal thin film 2' is reformed into a patterned transparent oxide thin film by laser irradiation, thereby forming a light shielding portion 2a made of a metal thin film. and a transmission Fourier transform hologram layer 2 having a transmission Fourier transform hologram region having a patterned light transmission portion 2b made of a transparent oxide thin film. For the transparent substrate, metal thin film, laminate for laser processing, adhesive layer (first adhesive layer, second adhesive layer), support (first support, second support), see "A. Hologram laminate Manufacturing method” and “B. Hologram laminate” can be used.
When irradiating the embedded body 51 for laser processing in FIG. 7(B) with laser light, the laser beam is applied to the metal thin film 2' from the side opposite to the transparent substrate 1 side (the side of the first support 7a). Alternatively, a laser beam may be irradiated from the side of the transparent substrate 1 (the side of the second support 7b).

Note that the present disclosure is not limited to the above embodiments. The above embodiment is an example, and any device that has substantially the same configuration as the technical idea described in the claims of the present disclosure and achieves the same effect is the present invention. It is included in the technical scope of the disclosure.

EXAMPLES The present disclosure will be specifically described below with reference to Examples.

A polyethylene terephthalate film having a thickness of 16 μm was prepared as a transparent substrate, and an aluminum deposition film having a thickness of about 50 nm was formed on one side of the transparent substrate. Next, a first adhesive layer was placed on the side of the metal thin film opposite to the transparent base material side, and a second adhesive layer was placed on the other side of the metal thin film to obtain a laminate for laser processing. As the first adhesive layer and the second adhesive layer, a heat-sealing adhesive containing a polyester-based resin as a main component was used.

Next, the first support is placed on the first adhesive layer side of the laminate for laser processing, the second support is placed on the second adhesive layer side of the laminate for laser processing, and the first support and the second support are placed. Implants were produced by crimping the two supports. Polycarbonate was used as the first support and the second support.

After that, the embedded body was irradiated with a laser from the first support side under the following conditions. At this time, the implant was irradiated with a laser according to a pattern prepared in advance by a computer. As a result, the aluminum deposition film on the laser irradiated portion was modified into a transparent oxide thin film, and a hologram laminate was obtained.

(Laser irradiation conditions)
A UV laser output of 2.5 W was used on the aluminum-deposited portion of the embedding body, and laser irradiation was performed at a scanning speed of 1000 mm/s to convert the aluminum oxide into aluminum oxide, thereby forming a transmission type Fourier transform hologram layer.

[evaluation]
A point light source was placed on the transmission Fourier transform hologram layer side (first support side) with respect to the transparent base material of the obtained hologram structure of the present invention, and transmission observation was performed from the transparent base material side (second support side). By the way, it was possible to observe a predetermined optical image by the transmission type Fourier transform hologram layer with good visibility. It has been shown that this manufacturing method enables variable information to be added later by irradiating an embedded body, such as a card, with a laser.

REFERENCE SIGNS LIST 1 transparent substrate 2 transmission type Fourier transform hologram layer 2a light shielding part 2b light transmission part 3 uneven structure for reflective embossed hologram 4 uneven structure for reflective Fourier transform hologram 5a first adhesive layer 5b second 2 Adhesive layer 6 Primer layer 7a First support 7b Second support 10 Laminate for laser processing 50 Transfer body for laser processing 51 Embedding body for laser processing 100 Hologram laminate

Claims (18)

a laser processing laminate manufacturing step for manufacturing a laser processing laminate having a transparent base material and a metal thin film formed on one side of the transparent base material;
A transmissive Fourier having a light-shielding portion made of the metal thin film and a patterned light-transmitting portion made of the transparent oxide thin film by irradiating a partial region of the metal thin film with a laser to transform it into a transparent oxide thin film. a transmission Fourier transform hologram layer forming step of forming a transform hologram layer;
The method for producing a hologram laminate, wherein the transmission Fourier transform hologram layer has a transmission Fourier transform hologram region in which light incident from a point light source is converted into an optical image by passing through the patterned light transmitting portion. The laminate for laser processing functions as a reflective embossed hologram by having an uneven structure formed on one surface of the transparent substrate and the metal thin film disposed on the surface on the uneven structure side. 2. The method for producing a hologram laminate according to claim 1, wherein the reflective embossed hologram area is formed by 3. The hologram laminate according to claim 2, wherein the pattern displayed by the optical image reproduced by the transmission type Fourier transform hologram area is a pattern having relevance to the pattern displayed by the reflection type embossed hologram area. Production method. The layered body for laser processing has an uneven structure formed on one surface of the transparent substrate and the metal thin film arranged on the surface of the uneven structure side, so that the reflection type Fourier transform hologram 2. The method of manufacturing a hologram laminate according to claim 1, having a functioning reflective Fourier transform hologram region. The laminate for laser processing according to any one of claims 1 to 4, wherein a first adhesive layer is arranged on the side of the metal thin film opposite to the transparent substrate side. A method for manufacturing a hologram laminate. 6. The method of manufacturing a hologram laminate according to claim 5, wherein the laminate for laser processing has a second adhesive layer disposed on a side of the transparent substrate opposite to the metal thin film. After the step of manufacturing the laminate for laser processing, the laminate for laser processing is transferred to the first support via the first adhesive layer to manufacture a transfer body, and then the transmission type Fourier transform hologram layer is formed. 6. The method of manufacturing a hologram laminate according to claim 5, wherein the laser irradiation in the step is performed. After the step of manufacturing the laminate for laser processing, a first support is arranged on the first adhesive layer side of the laminate for laser processing, and a second support is arranged on the second adhesive layer side of the laminate for laser processing. and pressing the first support and the second support to produce an embedded body in which the laser processing laminate is embedded between the first support and the second support 7. The method for manufacturing a hologram laminate according to claim 6, wherein the laser irradiation in the transmission type Fourier transform hologram layer forming step is performed thereafter. a transparent substrate; and a transmission type Fourier transform hologram layer disposed on one side of the transparent substrate and having a light-shielding portion made of a metal thin film and a patterned light-transmitting portion made of a transparent oxide thin film. death,
The transmission Fourier transform hologram layer has a transmission Fourier transform hologram region in which light incident from a point light source is transmitted through the patterned light transmitting portion and converted into a light image. The hologram laminate has an uneven structure formed on one surface of the transparent substrate, and the transmission Fourier transform hologram layer disposed on the surface on the uneven structure side,
10. The hologram laminate according to claim 9, wherein the transmission Fourier transform hologram layer has a reflective embossed hologram region in which the light shielding portion made of the metal thin film functions as a reflective embossed hologram. 11. The hologram laminate according to claim 10, wherein the picture displayed by said optical image reproduced by said transmission Fourier transform hologram area is a picture having relevance to the picture displayed by said reflection embossed hologram area. The hologram laminate has an uneven structure formed on one surface of the transparent substrate, and the transmission Fourier transform hologram layer disposed on the surface on the uneven structure side,
10. The hologram laminate according to claim 9, wherein said transmissive Fourier transform hologram layer has a reflective Fourier transform hologram region in which said light shielding portion made of said metal thin film functions as a reflective Fourier transform hologram. The hologram laminate according to any one of claims 9 to 12, wherein the hologram laminate has a first adhesive layer on the side of the transmission Fourier transform hologram layer opposite to the transparent substrate side. body. 14. The hologram laminate according to claim 13, wherein the hologram laminate has a first support on the side opposite to the transparent substrate side of the transmission Fourier transform hologram layer. 15. The hologram laminate according to claim 13, wherein the hologram laminate has a second adhesive layer on the side of the transparent substrate opposite to the transmission Fourier transform hologram layer side. 16. The hologram laminate according to claim 15, wherein the hologram laminate has a second support on the side of the transparent substrate opposite to the transmission Fourier transform hologram layer side. A laminate for laser processing, comprising a transparent base material and a metal thin film formed on one side of the transparent base material, and subjected to laser processing to form a transmission Fourier transform hologram region. An embedding body in which a laminate for laser processing having a second adhesive layer, a transparent substrate, a metal thin film, and a first adhesive layer in this order is embedded between a first support and a second support. and laser processed to form a transmission Fourier transform hologram region.

Images