A manufacturing process of a local bare-eye 3D platinum relief transfer paper and the transfer paper

Abstract

This invention discloses a manufacturing process and transfer paper for partial naked-eye 3D platinum embossed transfer paper. The process includes: S1, fabricating two nickel plates; S2, fabricating two molding rollers from the two nickel plates; S3, imprinting information onto the surface of a base film using the platinum embossed molding rollers with 3D patterns; S4, aluminizing the base film using an aluminizing machine; S5, bonding the base paper and base film together with an adhesive layer; S6, peeling off the base film; S7, printing a transparent optical focusing layer onto the surface of the 3D pattern using film; S8, bonding a microlens array transfer film to the transparent optical focusing layer on the surface of the embossed information layer; S9, peeling the microlens array transfer film from the transparent optical focusing layer; and S10, completing the fabrication of the partial naked-eye 3D platinum embossed transfer paper. This invention achieves a naked-eye 3D display effect by adding a microlens array to a specific location on the transfer paper and limiting the thickness of the transparent layer to the area beneath the microlenses, making the final packaging more decorative and anti-counterfeiting.

Description

Technical Field

[0001] This invention relates to the field of laser anti-counterfeiting transfer paper technology, and more specifically, to a manufacturing process and transfer paper for partial naked-eye 3D platinum embossed transfer paper. Background Technology

[0002] Currently, the application of naked-eye 3D display technology in the field of anti-counterfeiting packaging products is relatively limited. The main anti-counterfeiting products seen on the market are the security threads with light blue text and patterns found on $100 and Euro denominations. On packaging products, it is mainly used for anti-counterfeiting labels and markings. Naked-eye 3D anti-counterfeiting products are primarily film-coated products with a double-sided structure (such as...). Figure 1 As shown, a photolithographic relief information layer 200 with patterns and text is fabricated on the lower surface of the film 100. The information layer 200 contains a 3D pattern 300. A microlens array 400 is fabricated on the upper surface of the film 100. In this way, the lens array 400 on the upper surface magnifies the 3D pattern 300 information on the lower surface of the film 100. When the human eye observes through the lens surface, the size and shape of the pattern information on the lower surface can be seen to change dynamically, achieving a naked-eye 3D effect.

[0003] To ensure the 3D display effect, a certain thickness is required between the microlens array 400 and the 3D pattern 300, resulting in the thickness of the film 100 being generally above 49µm. The film 100 is quite thick. If this type of film is combined with transfer paper, not only will the overall thickness be very large, but the material cost will also increase significantly, which is not conducive to reducing plastic and protecting the environment. Therefore, there is an urgent need to improve this. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a manufacturing process and transfer paper for partial naked-eye 3D platinum embossed transfer paper. The transfer paper achieves a naked-eye 3D display effect by adding a microlens array to a local position and limiting the thickness of the transparent layer below the microlens. This makes the final printed packaging not only have the decorative effect of platinum embossing, but also has naked-eye 3D anti-counterfeiting technology similar to US dollars and euros, making the final packaging more decorative and anti-counterfeiting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses a manufacturing process for a partial naked-eye 3D platinum relief transfer paper, comprising the following steps:

[0007] S1. Make two nickel plates. One nickel plate is a platinum relief template with a 3D pattern, and the other nickel plate is a microlens array pattern engraved and used to make a microlens array transfer film.

[0008] S2. Make two molding rollers from the two nickel plates respectively;

[0009] S3, UV embossing: UV adhesive is coated on the surface of the base film, and then the information is embossed onto the surface of the base film by a platinum relief molding roller with 3D patterns, so that a relief information layer with 3D patterns is formed on the surface of the base film.

[0010] S4. Aluminizing: The base film is aluminized using an aluminizing machine to form a reflective aluminum layer on the surface of the embossed information layer.

[0011] S5. Lamination: A layer of adhesive is applied to the surface of the reflective aluminum layer by a coating roller, and the base paper and the base film are laminated through the adhesive layer.

[0012] S6. Peel off the base film, separate the 3D patterned embossed information layer from the base film and bond it with the backing paper to form a transfer paper with a platinum embossed effect.

[0013] S7. Printing: The film is adhered to the surface of the embossed information layer, with the pattern boundary of the film coinciding with the boundary of the 3D pattern. A transparent optical focusing layer is printed on the surface of the 3D pattern using the film and then photocured.

[0014] S8, Composite: Composite the microlens array transfer film with the transparent optical focusing layer on the surface of the relief information layer;

[0015] S9. Peeling: Peel the microlens array transfer film from the transparent optical focusing layer, and transfer the microlens array pattern onto the surface of the transparent optical focusing layer through a cold transfer process to form a microlens array layer. The light transmittance of the microlens array layer is over 95%.

[0016] S10. Complete the production of partial naked-eye 3D platinum relief transfer paper.

[0017] Furthermore, in step S1, the processing steps for the nickel plate with the platinum relief engraved with the 3D pattern include:

[0018] a. When designing the pattern, add 3D pattern information to the corresponding position within the platinum relief pattern;

[0019] b. Photolithographically print platinum relief patterns and 3D patterns and then assemble them;

[0020] c. Electroforming produces nickel plates with platinum reliefs engraved with 3D patterns.

[0021] Furthermore, it is necessary to produce positioning films with 3D pattern boundaries. There are two positioning films, which are used to produce two positioning printing rollers of the same size as the 3D pattern. One roller has a fine screen count and is used to print the transparent optical focusing layer, while the other roller has a large screen count and is used for the cold transfer process to transfer the microlens array layer.

[0022] Furthermore, in step S3, the base film is a PET film with a thickness of 15 μm, and the UV adhesive on the surface of the base film is a peelable adhesive, the composition of which is a multifunctional polyurethane acrylate composition. The curing energy of the UV adhesive at a speed of 35 m / min needs to reach more than 200 mJ / cm² under UV light irradiation.

[0023] Furthermore, in step S7, the transparent optical focusing layer is a UV adhesive layer, which is made of a multifunctional polyurethane acrylate composition. The curing energy of the UV adhesive at a speed of 35 m / min requires to reach more than 200 mJ / cm² under UV light irradiation, and the light transmittance of the cured UV layer is more than 95%.

[0024] Furthermore, in step S7, the thickness of the transparent optical focusing layer is between 50u and 52u.

[0025] Furthermore, step S8 specifically includes the following steps:

[0026] a. Use a high-line-count positioning printing roller to position and print a release layer for transferring the microlens array layer on the transparent optical focusing layer.

[0027] b. The microlens array transfer film is bonded to the surface of the transparent optical focusing layer on the embossed information layer through a release layer and then cured by UV lamp. The release layer is also a UV adhesive layer with a thickness of 5u-7u.

[0028] Furthermore, the base film after peeling can be reused 3-5 times. When reusing, the peeled base film can be directly started from step S3. The microlens array transfer film can be reused 3-5 times after peeling.

[0029] Furthermore, the outer contour of the microlens array pattern in the microlens array transfer film corresponds to the outer contour of the 3D pattern.

[0030] A partial naked-eye 3D platinum embossed transfer paper is manufactured using a specific process. It includes a base paper, an adhesive layer on its surface, a reflective aluminum layer on its surface, an embossed information layer on its surface, a 3D pattern within the embossed information layer, a transparent optical focusing layer on its surface located on the 3D pattern, and a microlens array layer on its surface. The outer contours of the transparent optical focusing layer and the microlens array layer are consistent with the outer contours of the 3D pattern.

[0031] The beneficial effects of this invention are:

[0032] 1. In this embodiment, the transparent optical focusing layer replaces the film in the prior art. The light transmittance of the transparent optical focusing layer formed after photocuring is superior to that of the film. Only a small amount of UV adhesive is needed to achieve local thickening of the transfer paper, that is, only the part with the 3D pattern needs to be thickened. Furthermore, the microlens array pattern is imprinted on the surface of the transparent optical focusing layer. While achieving local naked-eye 3D, the overall thickness of the transfer paper is effectively reduced. This not only improves the performance and quality of the transfer paper and makes processing more convenient, but also reduces production costs. Moreover, the elimination of the film reduces plastic, which is conducive to achieving the concept of green and environmentally friendly production. This makes the product highly competitive in the market. In addition, the thickness of the transparent optical focusing layer is easy and flexible to adjust, resulting in better decorative effect and anti-counterfeiting effect of the final printed packaging.

[0033] 2. The peeled base film can be reused 3-5 times. When reusing, the peeled base film can be directly started from step S3. By peeling the base film, the overall thickness of the transfer paper can be effectively reduced, thereby effectively solving the problem that the thickness of the base film affects the overall performance of the transfer paper. Furthermore, the peeled base film can be reused multiple times, effectively reducing the production cost of the transfer paper. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the existing technology;

[0035] Figure 2 This is a schematic diagram of one structure in this embodiment;

[0036] Figure 3 This is a flowchart illustrating the manufacturing process of this embodiment;

[0037] Figure 4 This is a schematic diagram of a microlens array;

[0038] Figure 5 This is a schematic diagram of the naked-eye 3D effect.

[0039] Reference numerals: 1. Base film; 2. Embossed information layer; 3. 3D pattern; 4. Reflective aluminum layer; 5. Adhesive layer; 6. Backing paper; 7. Transparent optical focusing layer; 8. Microlens array layer; 9. Microlens array transfer film; 10. Release layer. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] like Figures 3 to 5 As shown, a manufacturing process and transfer paper for partial naked-eye 3D platinum relief are disclosed, including the following steps:

[0043] S1. Make two nickel plates. One nickel plate is a platinum relief template engraved with 3D pattern 3, and the other nickel plate is engraved with microlens array pattern and used to make microlens array transfer film 9.

[0044] The processing steps for a nickel plate with a platinum relief engraved with 3D pattern 3 include:

[0045] a. When designing the pattern, add 3D pattern information to the corresponding position within the platinum relief pattern;

[0046] b. Photolithographically print the platinum relief pattern and 3D pattern 3 and then assemble them;

[0047] c. Electroforming produces a nickel plate with a platinum relief engraved with 3D pattern 3.

[0048] The processing steps for nickel plates engraved with microlens array patterns include:

[0049] a. Design as follows Figure 4 The microlens array pattern shown;

[0050] b. Photolithography is used to create a microlens array pattern;

[0051] c. Electroforming produces a nickel plate with a platinum relief engraved with 3D pattern 3.

[0052] In post-production, the 3D pattern 3 can be displayed using a microlens array pattern, such as... Figure 5 The image shown has a certain depth and is a stereoscopic effect (i.e., naked-eye 3D effect).

[0053] S2. Two nickel plates are made into two molding rollers respectively. The nickel plates are wrapped on the surface of the rollers to form a patterned molding roller. One molding roller is used to imprint a platinum relief pattern and a 3D pattern 3 on the surface of the base film 1, and the other is used to imprint a microlens array pattern on the surface of the transfer film to form a microlens array transfer film 9.

[0054] S3. UV Imprinting: UV adhesive is coated on the surface of the base film 1, and then the information is imprinted onto the surface of the base film 1 through a platinum embossed molding roller engraved with 3D pattern 3, so that an embossed information layer 2 with 3D pattern 3 is formed on the surface of the base film 1. The base film 1 is a PET film with a thickness of 15u. The UV adhesive on the surface of the base film 1 is a peelable adhesive, and its composition is a multifunctional polyurethane acrylate composition. The UV adhesive can adhere to the base film 1, and can be separated from the base film 1 during subsequent peeling. Through UV imprinting, the information can be imprinted in the UV adhesive and cured by a UV lamp. In the conventional platinum embossed transfer paper production process, the requirements for the curing energy speed and light of the UV adhesive are not high. In this embodiment, by using a UV adhesive with a curing energy speed of 35 m / min and a UV light irradiation of more than 200 mJ / cm², the curing effect of the UV lamp can be more stable, the 3D pattern 3 is displayed more clearly, the boundaries are more distinct, and it is beneficial to improve the naked-eye 3D display effect.

[0055] S4. Aluminizing: Aluminizing the base film 1 with an aluminum plating machine to form a reflective aluminum layer 4 on the surface of the relief information layer 2. Aluminizing can expose the information in the relief information layer 2.

[0056] S5. Composite: A layer of adhesive 5 is coated on the surface of the reflective aluminum layer 4 by a coating roller. The backing paper 6 and the base film 1 are then composited through the adhesive layer 5. The adhesive is used to bond the backing paper 6 and the reflective aluminum layer 4 of the base film 1 together.

[0057] S6. Peel off the base film 1, separate the embossed information layer 2 with 3D pattern 3 from the base film 1 and combine it with the backing paper 6 to form a transfer paper with a platinum embossed effect.

[0058] The peeled base film 1 can be reused 3-5 times. When reusing, the peeled base film 1 can be directly started from step S3. By peeling the base film 1, the overall thickness of the transfer paper can be effectively reduced, thereby effectively solving the problem that the thickness of the base film 1 affects the overall performance of the transfer paper. Furthermore, the peeled base film 1 can be reused multiple times, effectively reducing the production cost of the transfer paper.

[0059] This embodiment also requires the fabrication of positioning films with the boundaries of the 3D pattern 3. There are two positioning films, which are used to fabricate two positioning printing rollers of the same size as the 3D pattern 3. One roller has a fine screen count and is used to print the transparent optical focusing layer 7, while the other roller has a large screen count and is used for the cold transfer process to transfer the microlens array layer 8. By fabricating the roller with a fine screen count, the UV adhesive can penetrate more finely and evenly when printing the transparent optical focusing layer 7, thereby greatly improving the light transmittance of the transparent optical focusing layer 7.

[0060] S7. Printing: The film is adhered to the surface of the embossed information layer 2, with the pattern boundary of the film coinciding with the boundary of the 3D pattern 3. A transparent optical focusing layer 7 is printed on the surface of the 3D pattern 3 using the film and then cured by light. The transparent optical focusing layer 7 is a UV adhesive layer, and its material is a multifunctional polyurethane acrylate composition. The curing energy of the UV adhesive at a speed of 35 meters / minute requires more than 200 mJ / cm² under UV light irradiation, thereby ensuring that the light transmittance of the cured UV layer is more than 95%, effectively ensuring the display effect of naked-eye 3D. By printing the transparent optical focusing layer 7 only on the surface of the transfer paper at the position of the 3D pattern 3, the local thickening of the transfer paper is achieved.

[0061] The thickness of the transparent optical focusing layer 7 is between 50u and 52u. The transparent optical focusing layer 7 can achieve a certain depth of space on the surface of the 3D pattern 3, which is beneficial to the display effect of the subsequent 3D pattern. Furthermore, the thickness of the transparent optical focusing layer 7 can be changed as needed through partial printing. By printing transparent optical focusing layers 7 of different thicknesses, the 3D display effect can be modified, which is very flexible (different thicknesses of the transparent optical focusing layer 7 will result in different 3D display effects).

[0062] S8. Composite: The microlens array transfer film 9 is composited with the transparent optical focusing layer 7 on the surface of the relief information layer 2.

[0063] Step S8 specifically includes the following steps:

[0064] a. A release layer 10 for transferring the microlens array layer 8 is printed on the transparent optical focusing layer 7 using a positioning printing screen roller with a high screen count.

[0065] b. The microlens array transfer film 9 is combined with the surface of the transparent optical focusing layer 7 on the relief information layer 2 through the release layer 10, and then cured by UV lamp. The release layer 10 is also a UV adhesive layer with a thickness of 5u-7u.

[0066] like Figure 3 As shown, in this embodiment, the outer contour of the microlens array pattern in the microlens array transfer film 9 corresponds to the outer contour of the 3D pattern 3. The microlens array transfer film 9 is only composited with the transparent optical focusing layer 7. During the composite process, the microlens array pattern on the microlens array transfer film 9 is transferred to the release layer 10. The thickness of the release layer 10 is the thickness of the microlens. By achieving local composite, not only can the required microlens array pattern be transferred, but the subsequent peeling of the microlens array transfer film 9 can also be effectively facilitated.

[0067] S9. Peeling: Peel the microlens array transfer film 9 from the transparent optical focusing layer 7, that is, separate the microlens array transfer film 9 from the release layer 10. The release layer 10 is bonded to the surface of the transfer paper, and the microlens array pattern is transferred to the surface of the transparent optical focusing layer 7 through a cold transfer process to form the microlens array layer 8 (equivalent to the release layer 10). The light transmittance of the microlens array layer 8 is above 95%. The microlens array transfer film 9 can be reused 3-5 times after peeling. By reusing the microlens array transfer film 9, the production cost of the product can be effectively reduced.

[0068] S10. Complete the production of partial naked-eye 3D platinum relief transfer paper.

[0069] In this embodiment, the transparent optical focusing layer 7 replaces the film in the prior art. The light transmittance of the transparent optical focusing layer 7 formed after photocuring is superior to that of the film. Only a small amount of UV adhesive is needed to achieve local thickening of the transfer paper, that is, only the part with the 3D pattern 3 needs to be thickened. Furthermore, the microlens array pattern is imprinted on the surface of the transparent optical focusing layer 7. While achieving local naked-eye 3D, the overall thickness of the transfer paper is effectively reduced. This not only improves the performance and quality of the transfer paper and makes processing more convenient, but also reduces production costs. Moreover, the elimination of the film reduces plastic, which is conducive to achieving the concept of green and environmentally friendly production, making the product highly competitive in the market. In addition, the thickness of the transparent optical focusing layer 7 is easy and flexible to adjust, resulting in better decorative effect and anti-counterfeiting effect of the final printed packaging.

[0070] Example 2:

[0071] like Figure 2 As shown, this embodiment is manufactured using the process of Embodiment 1, including a base paper 6, an adhesive layer 5 on the surface of the base paper 6, a reflective aluminum layer 4 on the surface of the adhesive layer 5, the reflective aluminum layer 4 and the base paper 6 are bonded together by the adhesive layer 5, an embossed information layer 2 on the surface of the reflective aluminum layer 4, the embossed information layer 2 includes a 3D pattern 3 inside the embossed information layer 2, the embossed information layer 2 contains the pattern information to be displayed, a transparent optical focusing layer 7 on the surface of the embossed information layer 2, the transparent optical focusing layer 7 is combined with the embossed information layer 2, the transparent optical focusing layer 7 is located on the surface of the 3D pattern 3, a microlens array layer 8 on the surface of the transparent optical focusing layer 7, the outer contour of the transparent optical focusing layer 7 and the microlens array layer 8 are consistent with the outer contour of the 3D pattern 3, by setting a transparent optical focusing layer 7 on the surface of the 3D pattern 3 to achieve local thickening, and transferring the microlens array pattern on the surface of the transparent optical focusing layer 7, it is possible to achieve a local 3D display effect of the entire platinum embossed transfer paper, which can not only effectively reduce the overall thickness of the transfer paper, but also improve the anti-counterfeiting effect of the final printed packaging.

[0072] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A process for making a local bare-eye 3D platinum relief transfer paper, characterized in that, Includes the following steps: S1. Make two nickel plates. One nickel plate is a platinum relief template with a 3D pattern (3) and the other nickel plate is a microlens array pattern and is used to make a microlens array transfer film (9). S2. Make two molding rollers from the two nickel plates respectively; S3, UV imprinting: UV adhesive is coated on the surface of the base film (1), and then the information is imprinted onto the surface of the base film (1) by a platinum relief molding roller with 3D pattern (3) so that a relief information layer (2) with 3D pattern (3) is formed on the surface of the base film (1). S4. Aluminum plating: Aluminum plating is performed on the base film (1) using an aluminum plating machine to form a reflective aluminum layer (4) on the surface of the relief information layer (2). S5, Composite: A layer of adhesive (5) is coated on the surface of the reflective aluminum layer (4) by a coating roller, and the base paper (6) and the base film (1) are composited through the adhesive layer (5). S6. Peel off the base film (1), separate the embossed information layer (2) with 3D pattern (3) from the base film (1) and combine it with the backing paper (6) to form a transfer paper with a platinum embossed effect. S7. Printing: The film is attached to the surface of the relief information layer (2), and the pattern boundary of the film coincides with the boundary of the 3D pattern (3). A transparent optical focusing layer (7) is printed on the upper surface of the 3D pattern (3) through the film and then photocured. S8. Composite: The microlens array transfer film (9) is composited with the transparent optical focusing layer (7) on the surface of the relief information layer (2), wherein the outer contour of the microlens array pattern in the microlens array transfer film (9) corresponds to the outer contour of the 3D pattern (3). S9. Peel off the microlens array transfer film (9) from the transparent optical focusing layer (7), and transfer the microlens array pattern to the surface of the transparent optical focusing layer (7) through a cold transfer process to form a microlens array layer (8). The light transmittance of the microlens array layer (8) is above 95%. S10. Complete the production of partial naked-eye 3D platinum relief transfer paper.

2. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, In step S1, the processing steps of the nickel plate with the platinum relief engraved with the 3D pattern (3) include: a. When designing the pattern, add 3D pattern (3) information to the corresponding position within the platinum relief pattern; b. Photolithographically print platinum relief patterns and 3D patterns (3) and then assemble them; c. Electroforming yields a nickel plate with a platinum relief engraved with a 3D pattern (3).

3. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, It is also necessary to make positioning films with the boundary of the 3D pattern (3). There are two positioning films. The two positioning films are used to make two positioning printing rollers corresponding to the size of the 3D pattern (3). One roller has a fine screen count and is used to print the transparent optical focusing layer (7). The other roller has a large screen count and is used for cold transfer process to transfer the microlens array layer (8).

4. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, In step S3, the base film (1) is a PET film with a thickness of 15u. The UV adhesive on the surface of the base film (1) is a peelable adhesive, and its composition is a multifunctional polyurethane acrylate composition. The curing energy of the UV adhesive at a speed of 35 m / min needs to reach more than 200 mJ / cm² under UV light irradiation.

5. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, In step S7, the transparent optical focusing layer (7) is a UV adhesive layer, which is a multifunctional polyurethane acrylate composition. The curing energy of the UV adhesive at a speed of 35 m / min needs to reach more than 200 mJ / cm² when exposed to UV light. The light transmittance of the cured UV layer is more than 95%.

6. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, In step S7, the thickness of the transparent optical focusing layer (7) is between 50u and 52u.

7. The manufacturing process of a partial naked-eye 3D platinum relief transfer paper according to claim 3, characterized in that, Step S8 specifically includes the following steps: a. A release layer (10) for transferring the microlens array layer (8) is printed on the transparent optical focusing layer (7) using a positioning printing screen roller with a large screen line count. b. The microlens array transfer film (9) is combined with the transparent optical focusing layer (7) on the relief information layer (2) through a release layer (10) and then cured by UV lamp. The release layer (10) is also a UV adhesive layer with a thickness of 5u-7u.

8. The process for making a partial-gloss 3D platinum-flooded transfer paper according to claim 1, wherein, The base film (1) after peeling can be reused 3-5 times. When reusing, the base film (1) after peeling can be directly started from step S3. The microlens array transfer film (9) can be reused 3-5 times after peeling.

9. A partial naked-eye 3D platinum embossed transfer paper, manufactured using the manufacturing process of a partial naked-eye 3D platinum embossed transfer paper as described in any one of claims 1-8.

10. The partial-nude 3D platinum relief transfer paper according to claim 9, wherein, The system includes a base paper (6), an adhesive layer (5) on the surface of the base paper (6), a reflective aluminum layer (4) on the surface of the adhesive layer (5), an embossed information layer (2) on the surface of the reflective aluminum layer (4), a 3D pattern (3) inside the embossed information layer (2), a transparent optical focusing layer (7) on the surface of the embossed information layer (2), the transparent optical focusing layer (7) being located on the surface of the 3D pattern (3), and a microlens array layer (8) on the surface of the transparent optical focusing layer (7). The outer contour of the transparent optical focusing layer (7), the microlens array layer (8), and the outer contour of the 3D pattern (3) are consistent.

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