JP6413239B2 - Optical diffraction layer laminate sheet, optical diffraction layer laminate, and card manufacturing method - Google Patents

Description

  The present invention relates to a method for producing a light diffraction layer laminate sheet, a light diffraction layer laminate, and a card.

Conventionally, there has been a card in which a light diffraction structure such as a hologram is incorporated (for example, Patent Document 1).
However, the conventional optical diffraction structure has a high technical level for manufacturing, and the number of manufacturers is limited. Further, when the light diffraction structure is a Lippmann hologram, the technical level for manufacturing is higher and the number of manufacturers is further limited.

JP 2002-32724 A

  An object of the present invention is to provide an optical diffraction layer laminate sheet, an optical diffraction layer laminate, and a method for producing a card, which can easily produce a card having an optical diffraction structure.

  The present invention solves the problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another configuration.

-1st invention is an optical diffraction layer laminated body which forms a part of laminated structure of a card | curd, Comprising: The magnitude | size of an optical diffraction layer (22) is the same as the said optical diffraction layer, The said light The first adhesive layer (21, 221) laminated on the first surface, which is one surface side of the diffraction layer, has the same outer size as the light diffraction layer, and the other surface side of the light diffraction layer A second adhesive layer (23) laminated on the second surface, wherein the first adhesive layer and the second adhesive layer are thermoplastic members, and the adhesive development temperature is the first adhesive layer. The optical diffraction layer laminate is characterized in that the adhesive layer is higher than the second adhesive layer.
-2nd invention is the optical diffraction layer laminated body of 1st invention, The said 1st contact bonding layer (21) is a thermoplastic resin sheet, The said 2nd contact bonding layer is a thermoplastic adhesive material. It is a light diffraction layer laminated body characterized by being.
-3rd invention is the optical diffraction layer laminated body of 1st invention, The said 1st heat contact bonding layer (221) and the said 2nd heat contact bonding layer (23) are thermoplastic adhesive materials, The said light A protective sheet provided between one of the layers between the diffraction layer (22) and the first thermal adhesive layer and between the optical diffraction layer and the second thermal adhesive layer is provided. It is a light diffraction layer laminate.
The fourth invention is the optical diffraction layer laminate according to any one of the first to third inventions, wherein the optical diffraction layer (22) is a Lippmann hologram. Is the body.

The fifth invention includes a plurality of light diffraction layer laminates (20, 220) according to any one of the first to fourth inventions, and a release sheet (20a) in which the plurality of light diffraction layer laminates are laminated. These are optical diffraction layer laminate sheets.

-6th invention is a manufacturing method of the card | curd using the optical diffraction layer laminated body of any one of 1st to 4th invention, Comprising: Adhesiveness of said 2nd contact bonding layer (23) is carried out by heat seal processing. And a second adhesive layer adhesion step of adhering the sheet material (30, 330) by the second adhesive layer (21, 221, 222) at a temperature at which the adhesiveness of the first adhesive layer is not expressed, A first adhesive layer adhering step for adhering the sheet material (10, 310) by the first adhesive layer at a temperature at which the adhesiveness of the first adhesive layer is expressed by heat sealing after the second adhesive layer adhering step; It is a manufacturing method of the card | curd characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the optical diffraction layer laminated body sheet | seat, optical diffraction layer laminated body, and card | curd which can manufacture the card | curd which has an optical diffraction structure easily can be provided.

It is the top view and sectional drawing of the card | curd 1 of 1st Embodiment. It is sectional drawing of the base material sheet material 10A, hologram lamination sheet material 20A, and transparent sheet material 30A of 1st Embodiment. It is a top view of base material sheet material 10A, hologram lamination sheet material 20A, and transparent sheet material 30A of a 1st embodiment. It is sectional drawing of the base material sheet material 10A, hologram lamination sheet material 220A, and transparent sheet material 30A of 2nd Embodiment (The figure corresponded in FIG. 2). It is the top view and sectional drawing of the card | curd 301 of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a plan view and a cross-sectional view of a card 1 according to the first embodiment.
FIG. 1A is a plan view of the card 1 (a view of the card surface 1a viewed from the normal direction).
FIG. 1B is a cross-sectional view of the card 1 (a cross-sectional view taken along the line bb in FIG. 1).
In the embodiment, for convenience, the horizontal direction X, the vertical direction Y, and the vertical direction Z (thickness direction) of the card 1 will be described based on the state shown in FIG. It can be determined appropriately according to For example, in the vertical direction Z of the card 1, when the front and back of the card 1 are arranged opposite to the state of FIG. 1, the lower Z1 (lower surface side) of FIG. The upper surface side is the lower side. In the drawing, the configuration in the vertical direction Z is exaggerated for the sake of clarity.

The card 1 is used for a bank cash card, for example.
The card 1 includes a card substrate 10, a lower printed layer 12, a PC layer 21 (lower adhesive layer, first adhesive layer), a hologram layer 22 (light diffraction layer), and an HS (heat seal) layer 23 (upper adhesive layer, first adhesive layer). 2 adhesive layers), a transparent sheet layer 30, a magnetic stripe 30a, and an upper printing layer 31. The PC layer 21, the hologram layer 22, the HS layer 23, the transparent sheet layer 30, and the upper printing layer 31 are laminated in this order from the lower side Z <b> 1 on the upper side Z <b> 2 (one surface side) of the card substrate 10.
The card substrate 10 is a member that becomes the base of the card 1. The card substrate 10 is formed of a resin sheet material such as PET, PET-G, PVC, or PC. The outer shape of the card substrate 10 is the same as the outer shape of the card 1.
The color of the upper surface of the card substrate 10 is black. This black color may be the color of the card base material 10 itself, or a black base material printed on a base material other than black.

A lower printing layer 12 is provided on the lower surface of the card substrate 10.
The lower print layer 12 is printed with, for example, notes on card use.

The PC layer 21 is an adhesive layer that bonds between the card substrate 10 and the hologram layer 22. The PC layer 21 is laminated on the lower surface (first surface) of the hologram layer 22. The outer shape of the PC layer 21 is the same as the outer shape of the hologram layer 22. The PC layer 21 is a thermoplastic resin sheet. In the embodiment, PC (polycarbonate) is used. However, the type of resin is not limited to PC, and for example, PET or the like may be used.
Since the card substrate 10 and the hologram layer 22 are bonded to each other by the PC layer 21, the hologram layer 22 is destroyed when an attempt is made to peel off. Thereby, even if the hologram layer 22 is illegally peeled, the observer can easily grasp the peeling, and the card 1 can improve the security.

The hologram layer 22 is a light diffraction layer for preventing forgery of the card 1. The hologram layer 22 is a layer having a Lippmann type hologram. The hologram layer 22 has translucency. In the hologram layer 22, a hologram image 22a of a building is recorded.
The Lippmann-type hologram layer 22 is formed by applying a special polymer layer on a film (not shown) such as a PET substrate and forming interference fringes due to a change in refractive index in the polymer layer. The hologram layer 22 reproduces a hologram image by a diffraction phenomenon when light is incident on the interference fringes. The hologram layer 22 is excellent in the expression of a three-dimensional effect and a sense of depth in the vertical and horizontal directions, and a three-dimensional effect closer to a real object can be obtained. The hologram layer 22 is extremely difficult to forge because of the special material and manufacturing process used, and has a higher falsification suppressing effect than, for example, an embossed hologram.

  The outer shape of the hologram layer 22 is smaller than the outer shape of the card substrate 10, that is, the outer shape of the card substrate 10 and the transparent sheet layer 30. That is, the hologram layer 22 is laminated only on a part of the area on the card substrate 10. This is to reduce the cost by reducing the expensive hologram layer 22.

The HS layer 23 is a layer that bonds the hologram layer 22 and the transparent sheet layer 30 together. The HS layer 23 is laminated on the upper surface (second surface) of the hologram layer 22.
The HS layer 23 is formed of a thermoplastic adhesive (polyester resin or the like). Since the hologram layer 22 and the transparent sheet layer 30 are bonded by the HS layer 23, the hologram layer 22 is destroyed when it is going to be peeled off. Thereby, even if the hologram layer 22 is illegally peeled, the observer can easily grasp the peeling, and the card 1 can improve the security.
The PC layer 21 has a higher adhesive temperature than the HS layer 23.

  The transparent sheet layer 30 is formed of a resin sheet material such as PET, PET-G, or PVC. The upper surface of the transparent sheet layer 30 may have a mirror shape or a mat shape. The outer shape of the transparent sheet layer 30 is equal to the outer shape of the card substrate 10.

The magnetic stripe 30 a is provided on the upper surface of the transparent sheet layer 30. Information relating to bank account numbers and the like is recorded in the magnetic stripe 30a. This information can be read using a reader (not shown).
As shown in FIG. 1A, the magnetic stripe 30a is disposed in a region outside the transition portion 31c (described later) of the upper printing layer 31.

The upper print layer 31 is a layer printed with a black background color similar to that of the card substrate 10.
The upper print layer 31 is printed with characters 31a indicating a bank name, a graphic 31b, and other necessary information (not shown).
The upper printing layer 31 has a transition part 31c.
The transition portion 31c is a portion that is gradation-printed so that the shading becomes lighter toward the inside. The outer edge 31 d of the transition part 31 c is further inside than the edge 22 b of the hologram layer 22.
The density of the transition part 31c is gradually reduced from 100% of the outer edge part 31d to 0% of the inner edge part 31e. The density of the region 31 f outside the transition portion 31 c in the upper printed layer 31 is the same as or almost the same as that of the card substrate 10.

A portion on the inner side of the inner edge portion 31e of the transition portion 31c is a window portion 31g.
In the window portion 31g, the transparent transparent sheet layer 30 is completely exposed. For this reason, all the hologram images 22a of the hologram layer 22 are visible from the window 31g.
In addition, you may provide the upper printing layer 31 in the lower surface of the transparent sheet layer 30 as needed.

Next, how the card 1 is seen from the upper side Z2 will be described.
(Near edge 22b of hologram layer 22)
As described above, the density of the region 31 f outside the transition portion 31 c in the upper printed layer 31 is the same as or almost the same as that of the card substrate 10. For this reason, the edge 22b of the hologram layer 22 is blinded and concealed by the upper printing layer 31 (see arrow A). Furthermore, since the card base 10 and the upper print layer 31 are black-based that absorbs light, the edge 22b of the hologram layer 22 is hardly visible.

(Transition part 31c)
Only the color of the upper printing layer 31 is visually recognized at the outer edge 31d of the transition part 31c. Since the hologram layer 22 is transparent, the card substrate 10 can be visually recognized gradually from the outer edge 31d to the inner side. And only the color of the card | curd base material 10 comes to be visually recognized in the inner edge part 31e of the transition part 31c (refer arrow B). Furthermore, the upper printing layer 31 and the card substrate 10 are black of similar colors. For this reason, the upper printing layer 31 and the card | curd base material 10 are visually recognized integrally like the same member with no joint.

(Window part 31g)
Since the upper printing layer 31 is not formed on the transparent sheet layer 30, the hologram image 22a can be confirmed inside the window 31g. Since the hologram is a transparent hologram, the region of the hologram layer 22 other than the hologram image 22a (the region 22c outside the building, the portion 22e inside the building other than the line 22d, etc.) is visually recognizable. Is done. Further, as described above, the upper printing layer 31 and the card substrate 10 are visually recognized as a single piece without any joints.
For this reason, the periphery of the hologram image 22 a is observed so that the black back surface exists in a wider range than the hologram layer 22.
As a result, the hologram image 22a is observed more three-dimensionally with the hologram image 22a floating up against a black background.
Such visual effects have been confirmed by trial production.

(Outside of the transition part 31c)
Since the background color of the upper print layer 31 is printed in black on the outside of the transition part 31c, the inside of the card is concealed. For this reason, the figure 31b etc. printed on the upper printing layer 31 are observed. Further, the magnetic stripe 30a is concealed.
In addition, since the character 31a is printed so that it may cross the window part 31g, it can be visually recognized across the window part 31g, the transition part 31c, and the transition part 31c. In this case, the bank character 31a is observed inside the window 31g so as to overlap the hologram image 22a.

Next, a method for manufacturing the card 1 will be described.
FIG. 2 is a cross-sectional view of the base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A according to the first embodiment.
FIG. 3 is a plan view of the base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A according to the first embodiment.
The base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A are multi-faced sheet materials that are manufactured in a previous process prior to this process. The multi-page layout in FIG. 3 is an example in which the left and right rows are arranged in 5 rows.

First, the manufacturing method of each sheet material of the base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A is manufactured. Note that the order of the following steps may be appropriately changed.
(Base sheet material 10A)
The following processing is performed on a black resin sheet or a sheet material (card base material 10) obtained by performing black printing on a resin sheet having a color other than black.
-Printing process of lower printing layer 12 Transfer foil provided on PET, for example, is transferred to the lower side Z1 of the sheet material.
Thus, the base sheet material 10A provided with the lower printing layer 12 is manufactured.

(Hologram laminated sheet material 20A)
(1) Hologram Manufacturing Process As shown in FIG. 2, a hologram layer 22 is manufactured, a PC layer 21 is stacked on the lower side Z1 of the hologram layer 22, and an HS layer 23 is stacked on the upper side Z2 of the hologram layer 22. Then, the hologram laminate 20 is manufactured.
(2) Hologram Laminating Step The hologram laminated body 20 laminated in the above (1) is laminated on the release sheet 20a in order to hold it until a later step (see FIG. 3 (b-2)). Thereby, the hologram holding sheet material 25A in which the hologram laminate 20 is laminated on the upper side Z2 of the release sheet 20a is manufactured. Note that the release sheet 20a is peeled off in a later step.

(Transparent sheet material 30A)
(1) Lamination process of magnetic stripe 30a As shown in FIG. 2, the magnetic stripe 30a is laminated | stacked on the upper surface of a transparent sheet material (transparent sheet layer 30).
(2) Print layer process The transfer foil (upper print layer 31) provided, for example on PET is transcribe | transferred to the upper surface of the sheet material which laminated | stacked the magnetic stripe 30a by said (1).
Thereby, the transparent sheet material 30A in which the magnetic stripe 30a and the upper print layer 31 are laminated is manufactured.

(Hologram laminate sheet material 20A (second adhesive layer adhesion step))
Using a robot or the like, the release sheet 20a is peeled from the hologram holding sheet material 25A, and the hologram laminate 20 is adsorbed.
Then, the transparent sheet material 30A is heated and pressurized on the upper side Z2 of the hologram laminate 20 to develop the adhesiveness of the HS layer 23, and the hologram layer 22 and the transparent sheet material 30A are bonded by heat sealing. The set temperature of the heat seal is set to a temperature at which the adhesiveness of the HS layer 23 is exhibited but the adhesiveness of the PC layer 21 is not exhibited.
Thereby, the hologram laminated sheet material 20A in which the hologram laminated body 20 is laminated on the hologram laminated sheet material 20A is manufactured.
It has been confirmed by trial production that the destruction of the hologram due to the pressurization can be suppressed by providing the PC layer 21 on the lower side Z1 of the hologram layer 22.
Further, this step may be performed without peeling the release sheet 20a from the hologram laminated sheet material 20A.

Next, in this step, the base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A are processed as follows.
(1) Laminating step of the base sheet material 10A and the hologram laminated sheet material 20A (first adhesive layer bonding step)
The base sheet material 10A and the hologram laminated sheet material 20A are heated and pressurized, and bonded and laminated by heat sealing. In this case, the portions where the card base 10 and the transparent sheet layer 30 are in direct contact are bonded by thermal welding of these sheet layers (adhesives may be used as necessary).
On the other hand, the part where the card substrate 10 and the PC layer 21 are in contact is mainly bonded to the heat welding of the PC layer 21 by adhesiveness. In this case, since the PC layer 21 is softened, the destruction of the hologram due to the pressurization can be suppressed. Thus, since the PC layer 23 is a thermoplastic resin sheet, it can be used as an adhesive layer and can be used to protect the hologram layer 22 from breakage due to pressure.

(2) Punching process The sheet materials 10A, 20A, and 30A that are laminated and bonded are punched with a card outer shape to be separated into individual pieces.
Thus, the card 1 can be manufactured.
In this embodiment, since the hologram laminated sheet material 20A is manufactured in advance in other steps, the card 1 incorporating the Lippmann hologram can be easily manufactured by stacking the sheet materials 10A, 20A, 30A.

The card manufacturing process may be performed entirely in one factory, but the manufacturing of the base sheet material 10A, the hologram laminated sheet material 20A, and the transparent sheet material 30A, which are the previous processes, is performed in different factories. This step can be performed in different factories.
Here, the hologram layer 22 has advanced technology for manufacturing. For this reason, the hologram laminated sheet material 20A having the hologram layer 22 is manufactured in a factory having the technology, and the base sheet material 10A is manufactured in a factory different from the hologram laminated sheet material 20A, and is actually made into a card. The process can be shared so that this process is also performed in a factory different from the hologram laminated sheet material 20A.
If the process is shared in this way, the factory that performs this process does not have the technology to manufacture the Lippmann hologram, but the final card 1 can be manufactured as long as the hologram laminated sheet material 20A is available. That is, since the card manufacturing process includes a process of manufacturing the hologram laminated sheet material 20A, it is possible to easily manufacture a card having a Lippmann hologram. Thereby, even the card 1 having the Lippmann hologram can be manufactured in more factories, and the market can be expanded.
Even if the processes are shared in this way, the hologram laminated sheet material 20A has the PC layer 21 on the lower side Z1, and the transparent sheet material 30A is laminated on the upper side Z2, so that the hologram The layer 22 can be protected, and handling during storage and transportation is easy.

As described above, the card 1 according to this embodiment can be easily manufactured even if it has a lip hologram that requires high technology by manufacturing the hologram laminated sheet material 20A.
In addition, although the color of the upper printing layer 31 and the card | curd base material 10 showed the example which is black, it is not limited to this. For example, the upper printing layer 31 and the card substrate 10 may have any color as long as they are similar colors. In addition, regardless of the color of the card substrate 10 or the upper printing layer 31, it is sufficient that the upper printing layer 31 has an effect of concealing the edge 22b of the hologram layer.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the following description and drawings, parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals or the same reference numerals at the end (last two digits), and repeated descriptions are omitted as appropriate. To do.
FIG. 4 is a cross-sectional view of the base sheet material 10A, the hologram laminated sheet material 220A, and the transparent sheet material 30A according to the second embodiment (a diagram corresponding to FIG. 2).
In the hologram laminated sheet material 220A, an HS layer 221 (lower adhesive layer) and a PET layer 222 (protective sheet) are laminated in order from the lower side Z1 instead of the PC layer 21 (see FIG. 1).

In the transparent sheet material laminating step of the present card manufacturing process, the HS layer 221 bonds the hologram laminated sheet material 20A and the base sheet material 10A by heat sealing. For this reason, the HS layer 221 is higher in the adhesive development temperature than the HS layer 23 for the same reason as in the first embodiment. That is, when the hologram layer 22 is laminated under the transparent sheet layer 30 by heat sealing, the adhesiveness of the HS layer 23 is exhibited, but the adhesiveness of the HS layer 221 is not expressed.
Further, the PET layer 222 can suppress the destruction of the hologram due to the pressurization.

Thus, the card of this embodiment has the same effects as those of the first embodiment because the PET layer 222 and the HS layer 221 function in the same manner as the PC layer 21 of the first embodiment.
The PET layer 222 may be laminated between the hologram layer 20 and the HS layer 23. Even in this case, it has been confirmed by trial manufacture that the PET layer 222 can suppress the destruction of the hologram due to the pressurization.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 5 is a plan view and a cross-sectional view of the card 301 of the third embodiment.
The card substrate 310 is different from the first embodiment in that it includes a print layer 311.
FIG. 5 illustrates an example in which the name of the cardholder is printed as the print layer 311, but the present invention is not limited to this, and a finer background pattern, microprint, or the like may be provided. Although description is omitted, the printing layer 311 is provided by printing on the base sheet material 10A at the time of manufacturing the base sheet material 10A (see FIG. 2). Note that the color of the card substrate 310 is not black and may be other colors.
The upper printing layer 331 is not provided with the transition part 31c, and only the characters 331a and figures 331b necessary for the transparent sheet material are printed. That is, in the background region other than the characters 331a and the graphic 331b, the transparent surface is exposed, the card base material 310 can be visually recognized (see arrow C), and the edge 22b of the hologram layer 22 can also be visually recognized.

As described above, the card 301 of the present embodiment can visually recognize the upper surface of the card base 310 and the print layer 311 on the card base 310, and can have a mode different from the above-described embodiment. For example, if a photo of the cardholder is provided on the print layer 311, the card 301 is suitable for a certificate or the like.
The configuration of the third embodiment can also be applied to the second embodiment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as in the modifications described later, and these are also included in the present invention. Within the technical scope. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. It should be noted that the above-described embodiment and modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(1) In the embodiment, an example in which the hologram layer is a Lippmann type is shown, but the present invention is not limited to this. For example, the hologram layer may be an embossed type.

(2) In the embodiment, the example in which the print layer is provided on the upper side of the transparent sheet layer is shown, but the present invention is not limited to this. For example, a printing layer may be provided in the lower layer of a transparent sheet layer, and this may be laminated | stacked on a card | curd base material. In this case, since the transparent sheet layer is disposed on the upper side of the printing layer, the printing layer can be protected from fouling during production or use.

(3) In the first and third embodiments, the example in which the lamination order of the hologram laminate 20 is the PC layer 21, the hologram layer 22, and the HS layer 23 from the lower side is shown, but is not limited thereto. The lamination order of the hologram laminate 20 may be reversed upside down, and may be the HS layer 23, the hologram layer 22, and the PC layer 21 from the lower side. In this case, first, the card substrate 10 and the hologram laminate 20 are bonded with the HS layer 23 by heat sealing, and then the transparent sheet layer 30 and the hologram laminate 20 are bonded to the PC layer 21 by heat sealing. Can be glued together. Thus, the upper and lower sides of the hologram laminate 20 can be set as appropriate depending on the convenience of the card manufacturing process.
Similarly, also in the second embodiment, the hologram laminate 220 may be turned upside down.

(4) In the embodiment, the example in which the transition unit does not overlap with the image portion of the hologram is shown, but the present invention is not limited to this. The transition portion may be formed so as to overlap with the image portion of the hologram and become lighter and darker toward the inside. In this case, the image can be observed by the transition unit so that the periphery is blurred and becomes sharper as it goes inward.

(5) In the embodiment, an example of a card having a hologram layer has been shown, but the present invention is not limited to this. For example, you may use for a cash voucher.

(6) In the embodiment, the card is shown as an example of being manufactured by multiple imposition using a sheet material, but is not limited to this. The card may be manufactured as a single unit. In this case, each sheet material constituting one card may be laminated. In this case, a transparent sheet layer in which one hologram layer is laminated may be used as a hologram laminated sheet material in which one hologram layer is laminated.

(7) In the embodiment, the example in which the printing on the card substrate is provided in a range that does not overlap the hologram layer is shown, but the present invention is not limited to this. By providing the printing on the card substrate so as to overlap the hologram layer, the hologram image and this printing are observed to overlap and the design can be improved. In this case, since it is difficult to forge, security can be improved.

1,301 card 10,310 card substrate 10A substrate sheet material 12 lower printing layer 20A, 220A, 320A hologram laminated sheet material 21 PC layer 22 hologram layer 23 HS layer 30 transparent sheet layer 30a magnetic stripe 30A transparent sheet material 31, 331 Upper printing layer 31c Transition portion 31g Window portion 221 HS layer 222 PET layer

Claims (7)

An optical diffraction layer stack forming a part of a stacked structure of cards,
An optical diffraction layer;
A first adhesive layer having the same outer shape as the light diffraction layer, and laminated on a first surface which is one surface side of the light diffraction layer;
The size of the outer shape is the same as that of the light diffraction layer, and is laminated on the second surface which is the other surface side of the light diffraction layer, and the surface opposite to the light diffraction layer is not bonded. A second adhesive layer;
A release sheet laminated with the first adhesive layer;
Said first adhesive layer and the second adhesive layer is a member of thermoplastic, expression temperature adhesion, the first adhesive layer is rather higher than the second adhesive layer,
The first adhesive layer and the second adhesive layer are thermoplastic adhesives,
A protective sheet provided between one of the layers between the light diffraction layer and the first adhesive layer and between the light diffraction layer and the second adhesive layer;
An optical diffraction layer laminate characterized by the above. In the light diffraction layer laminate according to claim 1,
Comprising a transparent sheet layer laminated to the second adhesive layer;
An optical diffraction layer laminate characterized by the above. In the light diffraction layer laminate according to claim 2,
Comprising a printed layer laminated to the transparent sheet layer;
An optical diffraction layer laminate characterized by the above. In the optical diffraction layer laminated body in any one of Claims 1-3,
The first adhesive layer is a thermoplastic resin sheet,
The second adhesive layer is a thermoplastic adhesive;
An optical diffraction layer laminate characterized by the above. In the optical diffraction layer laminated body in any one of Claims 1-4 ,
The light diffraction layer is a Lippmann hologram;
An optical diffraction layer laminate characterized by the above. An optical diffraction layer laminate sheet comprising a plurality of optical diffraction layer laminates according to any one of claims 1 to 5 . A method for producing a card using the optical diffraction layer laminate according to any one of claims 1 to 5 ,
A second adhesive layer adhesion step of adhering a sheet material with the second adhesive layer at a temperature at which the adhesiveness of the second adhesive layer is expressed and the adhesiveness of the first adhesive layer is not expressed by heat sealing;
A first adhesive layer adhesion step of adhering a sheet material with the first adhesive layer at a temperature at which the adhesiveness of the first adhesive layer is expressed by heat sealing after the second adhesive layer adhesion step;
A card manufacturing method characterized by the above.

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