JP2013222027A - Display body and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display body, having microstructure such as a diffraction grating and comprising a metal reflection layer and a visible transmissive colored layer, in which the front and the rear thereof show different colors and a pattern end of the metal reflection layer coincides with a pattern end of the visible transmissive colored layer, thereby attaining high visibility and a high forgery preventing effect.SOLUTION: In a display body, a metal reflection layer and a visible light transmissive colored layer are sequentially laminated on one surface of a transparent base material, and the visible light transmissive colored layer contains a laser beam absorbent material. The display body includes a transparent pattern in which a portion of the metal reflection layer and the visible light transmissive colored layer is removed or modified.

Description

  The present invention relates to a display body that exhibits an anti-counterfeit effect, a decoration effect, and an aesthetic effect by optical technology.

  Many display bodies used for counterfeiting have a fine structure such as a diffraction grating, a hologram, and a lens array. In general, these displays have a complicated structure and are difficult to analyze. In order to manufacture these structures, an expensive manufacturing facility such as an electron beam lithography system is required. it can.

  Moreover, in order to improve the visibility of such a display body and to further improve the forgery prevention effect, in addition to the fine structure described above, a metal reflective layer in which characters, logos, or other patterns are formed is applied. Display bodies are known.

  As a method for patterning the metal reflective layer as described above, for example, the following methods are conventionally used.

  On one side of the substrate, water-washing ink that is solubilized with water is printed with a negative pattern, and a metal thin film such as aluminum is formed on the entire surface by vapor deposition or sputtering to obtain a metal reflective layer. Washing sea light processing is known in which the pattern of the metal reflective layer is formed by washing the previous washing ink with water.

  In addition, a metal thin film of aluminum or the like is formed on one whole surface of the substrate by vapor deposition or sputtering to produce a metal reflective layer, and a mask agent is printed on the metal reflective layer in a positive pattern, and then the mask is formed. There is known an etching method for patterning a metal reflective layer by corroding a metal reflective layer on which no agent is printed with a corrosive agent.

  Further, a laser processing method is known in which a pattern is formed by irradiating a portion of the metal reflective layer to be removed with laser to destroy the metal reflective layer (see Patent Document 1).

  However, since the display bodies obtained by the above-mentioned n methods are highly dependent on the metal reflective layer whose visibility is patterned, it is difficult for the user to judge the authenticity by visual observation. There is a problem in obtaining a sufficient anti-counterfeit effect suitable for practical use.

  For such a visibility problem, for example, a display body that has different colors on the front and back surfaces by providing a colored layer on the display body having a metal reflection layer has also been proposed (see Patent Document 2).

  Specifically, using a colored photoresist of at least two or more colors, patterning is performed by exposure and development to form a mask, and by repeating this, a colored pattern that is coated in at least two colors on the same plane Is a display body formed. Since the display body obtained by this method looks different colors on the front and back sides, a great effect is obtained as visibility (see FIG. 3).

However, since this display body uses a colored resist as a mask to remove the metal reflective layer by etching, pattern accuracy is likely to be reduced by etching as compared to a transparent resist that is normally performed. For example, as shown in FIG. 4A, the metal reflection layer 13 remains larger than the mask 14 due to insufficient etching, or the metal reflection from the mask 14 to the inner side due to excessive etching as shown in FIG. 4B. The phenomenon that the layer 13 is removed occurs,
There may be a problem in the accuracy of the fine structure.

JP 2009-128475 A Special table 2010-500196 gazette

  An object of the present invention is a display body composed of a metal reflective layer having a fine structure such as a diffraction grating and a visible transmissive colored layer, exhibiting different colors on the front and back sides, and visible on the pattern end of the metal reflective layer. The present invention provides a display body with high visibility and anti-counterfeiting effect, in which the pattern end portions of the transmissive colored layer are matched.

  The invention according to claim 1 of the present invention is a display body in which a metal reflective layer and a visible light transmissive colored layer are sequentially laminated on one surface of a transparent substrate, wherein the visible light transmissive colored layer is a laser. A display body comprising a light-absorbing material and having a transparent pattern in which a part of the metal reflective layer and the visible light transmitting colored layer is removed or altered.

  The invention according to claim 2 of the present invention is the display body according to claim 1, wherein the laser light absorbing material has absorption in an ultraviolet region and an infrared region.

  The invention according to claim 3 of the present invention is the display body according to claim 1 or 2, wherein the visible light transmissive colored layer is composed of two or more patterns.

  The invention according to claim 4 of the present invention is characterized in that a fine structure having a diffractive structure is formed between the transparent substrate and the metal reflective layer. It is a display.

  The invention according to claim 5 of the present invention is the method for manufacturing a display body according to any one of claims 1 to 4, wherein at least a fine structure forming layer and a metal reflection are formed on one surface of the transparent substrate. Layer and visible light transmissive colored layer are sequentially laminated, and then irradiated with laser light of a specific wavelength to form a transparent pattern layer in which a part of the metal reflective layer and visible light transmissive colored layer is removed or altered It is the manufacturing method of the display body characterized by doing.

  According to the present invention, there is provided a display body comprising a metal reflective layer and a visible light transmissive colored layer, wherein the visible light transmissive colored layer has a laser light absorbing material. The light-transmitting colored layer can have a transparent pattern that has been removed or altered at the same time, and can be seen in different colors on the front and back sides, and visible by forming a transparent pattern on the metal reflective layer and the visible light-transmitting colored layer. Two or more kinds of patterns can be formed on the light-transmitting colored layer, and a higher forgery prevention effect than before can be obtained.

It is a plane schematic diagram of a display which is one embodiment of the present invention. It is a section schematic diagram of a display object which is one embodiment of the present invention. It is a plane schematic diagram of the display which is one conventional embodiment. It is the cross-sectional schematic of the display body which is one conventional embodiment.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic plan view of a display body according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a display body according to an embodiment of the present invention.

  FIG. 1 (a) shows a schematic plan view when the display body of the present invention is observed from the front side, and FIG. 1 (b) shows a schematic plan view when observed from the back side. That is, the display body of the present invention has a microstructure forming layer 12, a metal reflection layer 13, and a color 1 on one surface of a substrate 10 through a release layer 11 as shown in the schematic cross-sectional view of FIG. By irradiating a laser beam onto a structure in which the visible transmission coloring layer 16 composed of (16a) and color 2 (16b) is sequentially laminated, the unnecessary metal reflection layer 13 and visible transmission as shown in FIG. By removing the colored layer 16 at the same time, pattern formation of the visible transmissive colored layer 16 composed of two colors can be obtained. Note that FIG. 2 shows the two visible transmissive colored layers 16 of color 1 (16a) and color 2 (16b), but it is possible to form a pattern of two or more colors, and this is not restrictive.

  When the display body of the present invention obtained by the above method is observed from the surface side, as shown in FIG. 1A, the star-shaped metal reflection layer 2a and the transparent character pattern 4 (TOP) are passed through the base material. ) Is observed. On the other hand, from the back side of the display body, as shown in FIG. 1B, a star-shaped metal reflection layer 2b, a colored pattern 3 partially covered with a visible transmission colored layer, and a transparent character pattern 4 (TOP). ) Is observed.

  The substrate 10 used in the present invention is particularly limited as long as it is transparent and smooth, such as polyethylene terephthalate (PET), and has heat resistance and mechanical strength that can withstand practical use. It is not a thing.

  Moreover, as resin used for the fine structure formation layer 12 which comprises the display body of this invention, a light transmissive thermoplastic resin, a thermosetting resin, and an ultraviolet-ray or an electron beam curable resin (photocurable resin) is used. Can be used. By using such a resin, it is possible to easily form a fine structure by transferring the fine processing pattern from a mother plate, which has been processed in advance, to the fine structure forming layer 12. Moreover, as said uneven structure, the height of a convex part is 100 nm or more, the width | variety of a convex part upper surface is 50-100 nm, and a pitch is 200 nm or less, for example.

  Examples of the thermoplastic resin include PET, polyethylene naphthalate, polycarbonate, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, nitrocellulose, polyethylene, polypropylene, acrylic styrene copolymer, vinyl chloride, and polymethyl methacrylate resin. Etc.

  Examples of the thermosetting resin include polyimide, polyamide, polyester urethane, acrylic urethane, epoxy urethane, silicone, epoxy, and melamine resin.

  Further, the ultraviolet ray or electron beam curable resin (photocurable resin) is a resin that is cured by irradiating with ultraviolet rays or an electron beam, for example, as a typical resin that undergoes radical polymerization upon irradiation with light. Examples include acrylic resins having an acryloyl group in the molecule, and epoxy acrylate-based, urethane acrylate-based, polyester acrylate-based, polyol acrylate-based oligomers or polymers, monofunctional, bifunctional or polyfunctional (meth) acrylic monomers. It is done.

  Specific examples of the monofunctional, bifunctional or polyfunctional (meth) acrylic monomer include tetrahydrofurfuryl acrylate, 2-hydroxyethyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, polyethylene glycol diacrylate, and polypropylene glycol diacrylate. An oligomer or polymer such as acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate or pentaerythritol tetraacrylate, or a mixture thereof can be used.

  Moreover, as what is used for the metal reflective layer 13 which comprises the display body of this invention, aluminum, silver, tin, chromium, nickel, copper, gold | metal | money, these alloys, etc. can be used. Specifically, it is preferable to form a film with a thickness of 1 to 100 nm by a vacuum film forming method, for example, a vacuum vapor deposition method or a sputtering method.

  Moreover, what is used for the visible transmission colored layer 16 which comprises the display body of this invention is obtained by mixing dye, a pigment, and an infrared absorber with the binder resin generally used for colored ink. Specifically, when an Nd: YAG laser having a wavelength of 1064 nm is used as a near-infrared laser, for example, the absorption rate is 50% or more, preferably 70% or more with respect to this wavelength. Present preferably (see FIG. 6).

The pattern formation method for producing the display body of this invention is demonstrated below.
As described above, the display body of the present invention is formed by forming a fine structure on a base material and further laminating the metal reflective layer 13 and the visible transmission colored layer 16 in order, and thereafter, the wavelength is 1064 nm. The Nd: YAG laser is irradiated with a near infrared laser, and the metal reflective layer 13 and the visible transmission colored layer 16 are patterned simultaneously. That is, the visible transmission colored layer 16 has a pattern formed overlapping with a part of the metal reflective layer 13 at the same time as the inside of the patterned visible transmission colored layer 16 even when a colored layer of one color is used. In addition, a transparent pattern can be formed, and by forming at least two or more patterns, a display body having a higher anti-counterfeit effect can be provided.

  As an example of forming an arbitrary pattern by irradiating a near infrared laser, a character, a logo, a geometric pattern, etc. can be formed. For example, if it is necessary to distinguish this display body individually, So-called numbering can be performed, in which a unique number is formed on the display body.

  In addition, a sticker can be produced in which an adhesive pattern is further applied on the visible transmission colored layer 16 of the display body of the present invention, and then an arbitrary pattern is formed by irradiation with a near infrared laser. Moreover, it can transfer to a display article after adhesion processing, and can also irradiate a near-infrared laser and can form arbitrary patterns after that.

  As shown in FIG. 1, the display body of the present invention described above, after forming a star-shaped metal reflection layer, forms a visible transmission colored layer on a part of the upper surface, and further irradiates a near infrared laser. The transparent character pattern 4 (TOP) can be formed by removing the metal reflective layer and the visible transmission colored layer corresponding to the character pattern 4 (TOP) at the same time. At this time, as shown in FIG. 1A, the star-shaped metal reflection layer 2a and the transparent character pattern 4 (TOP) are observed from the surface side of the display body through the base material. On the other hand, from the back side of the display body, as shown in FIG. 1B, a star-shaped metal reflection layer 2b, a colored pattern 3 partially covered with a visible transmission colored layer, and a transparent character pattern 4 (TOP). ) Is observed.

  Hereinafter, the embodiment will be described in detail.

<Example 1>
A 19 μm-thick PET film was used as a substrate, and an acrylic resin was applied on one surface by a gravure coating method so that the film thickness after drying was 2.0 μm to form a release layer. Next, a two-component curable urethane resin is applied onto the release layer by a gravure coating method so that the film thickness after drying is 1.0 μm, and an optical structure forming layer is provided thereon. A mold having a structure was pressed under heating at 200 ° C. to form an uneven microstructure. Next, aluminum was deposited on the entire surface of the uneven microstructure to form a metal reflective layer having a thickness of 50 nm.

Next, an ink having the following composition was prepared, and a visible transmission colored layer was formed by pattern printing by a gravure printing method. In addition, the film thickness after drying of the visible transmission colored layer was 1.8 μm. Moreover, the content rate of the infrared rays absorber with respect to the total solid in the visible transmission coloring layer formed was 3 weight%, and the absorptivity in wavelength 1064nm was 70% or more.
<Ink composition for visible transparent coloring layer>
Vinyl chloride-vinyl acetate copolymer resin 96 parts by weight Yellow coloring dye 1 part by weight Infrared absorber 3 parts by weight MEK (methyl ethyl ketone) 250 parts by weight Toluene 150 parts by weight

  Next, an adhesive made of vinyl chloride-vinyl acetate copolymer resin in which silica filler is dispersed is applied to the entire surface including the metal reflective layer and the visible transmission colored layer so as to have a dry film thickness of 2 μm by a gravure coating method. A transfer foil was prepared by coating the film.

  Next, the transfer foil was placed on a transparent card base material and pressure-bonded with a 200 ° C. heating roll, and then the PET film was peeled off to transfer the display body before display (before laser irradiation) to the card base material.

  Thereafter, the display component was irradiated with a Nd: YAG laser having a wavelength of 1064 nm, and unnecessary metal reflection layer and visible transmission color layer were simultaneously removed to form a serial number.

  According to the above steps, a card similar to that in FIG. 1 having different colors, that is, a silver color on the front side, a partial gold color on the back side, and a transparent serial number portion was produced. In the serial number printing portion, the edge portions of the metal reflective layer and the visible transmissive colored layer were completely matched.

<Example 2>
A metal reflective layer is formed in the same manner as in Example 1, then ink for a mask having the following composition is prepared, and pattern printing is performed by a gravure printing method to form a mask having a thickness of 1.0 μm after drying did.
<Ink composition for mask>
20 parts by weight of modified norbornene resin (glass transition temperature: 171 ° C.)
Precipitated barium sulfate (specific gravity: 5.5) 10 parts by weight Infrared absorber 0.6 parts by weight MEK (methyl ethyl ketone) 40 parts by weight Toluene 30 parts by weight

  Next, the mask is immersed in an aqueous NaOH solution (1.5 N) at 50 ° C. for 10 seconds to etch the exposed metal reflective layer not covered with the mask, and an aqueous HCl solution (0.5 N) is used. The display body before display (before laser irradiation) was produced by neutralization and washing.

  Next, an adhesive layer made of an acrylic resin was applied to the entire surface of the display body by a flexographic printing method to produce a sticker, which was attached to a transparent package (packaging body) as an anti-opening seal.

  Next, an Nd: YAG laser having a wavelength of 1064 nm was irradiated onto a part of the metal reflective layer and the mask of the sticker, and the unnecessary metal reflective layer and the mask were simultaneously removed to form a serial number. At this time, perfect coincidence was found between the formed metal reflection layer of the serial number and the edge of the mask.

  The display body of the present invention has a high anti-counterfeiting effect and can be used as a label or transfer foil, and can be used as an anti-counterfeit object as a label, or can be integrated by transfer. Can do.

DESCRIPTION OF SYMBOLS 1 ... Transparent area 2a ... Metal reflective layer 2b on the surface side ... Metal reflective layer 3 on the back side ... Colored pattern 4 ... Transparent character pattern 10 ... Base material 11 ... Peeling layer 12 ... Microstructure forming layer 13 ... Metal reflecting layer 14 ... Coloring mask 15 ... Adhesive layer 16 ... Visible transparent coloring layer 16a ... Color 1
16b ... Color 2

Claims (5)

  A display body in which a metal reflective layer and a visible light transmissive colored layer are sequentially laminated on one surface of a transparent substrate, wherein the visible light transmissive colored layer contains a laser light absorbing material, and the metal reflective layer and A display body comprising a transparent pattern in which a part of a visible light transmitting colored layer is removed or altered.   The display body according to claim 1, wherein the laser light absorbing material has absorption in an ultraviolet region and an infrared region.   The display body according to claim 1, wherein the visible light transmissive colored layer is composed of two or more patterns.   The display body according to claim 1, further comprising a fine structure forming layer having a diffractive structure between the transparent substrate and the metal reflective layer.   It is a manufacturing method of the display body in any one of Claims 1-4, Comprising: A metal reflective layer and a visible light transmissive colored layer are laminated | stacked in order on one side of a transparent base material, Then, the laser of a specific wavelength A method for producing a display body, characterized by forming a transparent pattern in which a part of a metal reflective layer and a visible light transmitting colored layer is removed or altered by irradiation with light.