JP4463575B2 - Copy protection media and labels for copy protection media - Google Patents

Description

  The present invention relates to a copy prevention medium and a copy prevention medium label that make it difficult to copy predetermined information displayed by printing or the like by a copying machine.

  Copying prevention media refers to information such as confidential matters and personal information that should be prevented from being leaked to unspecified third parties, such as documents and cards displayed by printing, etc. This means that information can be prevented from being copied by a copying machine.

Conventionally, as a technique for preventing copying, in Patent Document 1, for example, a warning mark such as “VOID” or the like is provided on a paper base material using a fine screen, and this warning mark is not normally visible. Thus, it is described that a background tone screen (camouflage screen) larger than the fine screen is formed on the entire surface of the base material from above the warning mark. The information is displayed by printing or the like on the surface of the base paper thus formed.
According to this, a warning mark is displayed on the copy image superimposed on the image corresponding to the information.

However, in this case, a paper base material that has been subjected to a copy prevention process such as a warning mark in advance is formed as a printing base paper, and then, for example, information such as the contents of a document or the display of a cash voucher is printed or printed on the base paper. Therefore, when copying, all information including information that should be prevented from being copied is copied and reproduced.
Further, since it is complicated to position a display portion of predetermined information that needs to be prevented from being overlapped with a warning mark as appropriate, it is difficult to delete information on the display portion at the time of copying.
Further, when there are a large number of information display portions, it may be difficult to identify warning marks appearing on the copy image.

Similarly, as a technology for preventing copying, a sheet (also referred to as a black sheet), which is difficult to see through with visible light but can be easily seen through with ultraviolet light, is used as a display unit for information that should be prevented from copying. The attached technology is known. According to this technique, it is difficult to copy this information by a copying machine, and it is possible to prevent copying. Further, it is possible to prevent copying by a simple process of attaching this sheet to the display section for specific information.
However, in this case, after attaching the sheet to the base paper, an ultraviolet irradiation device or the like must be used in order to reconfirm the original specific information by visual observation, which is complicated.

Although not related to the copy-preventing medium, Patent Document 2 describes a method of manufacturing a light diffusion sheet used for a back light source of a liquid crystal display (LCD) as a technique related to the present invention. However, there is no description that this technology is applied to a copy protection medium, and there is no description that suggests this.
JP-A-53-142237 JP-A-5-169015

  An object of the present invention is to provide a copy-preventing medium and a copy-preventing medium label which can prevent copying of predetermined information and can easily visually recognize this information.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, the code | symbol corresponding to embodiment and the Example of this invention is attached | subjected and demonstrated, but this invention is not limited to this.

The invention of claim 1 is formed in an information display layer for displaying information (3) to be protected from copying and a polygonal column, and among the side surfaces, the first surface (10) and the second surface (11). ) On the first surface (10) and the second surface (11) of the prism (7), and a prism layer formed by arranging a plurality of prisms (7) provided facing the information display layer. Each of the document irradiating light of the copying machine, which is in contact with each other and has a low refractive index layer (8) having a lower refractive index than the prism (7), is incident on the prism (7) from an angle within a predetermined range. (7) The first surface (10) is arranged so that an incident angle passing through the first surface (10) and entering the first surface (10) is larger than a critical angle in the first surface (10). The information includes information (3) to be protected from copying and information (5) that does not need to be protected from copying. The first surface (10) of the prism (7) and the other prisms (7) adjacent to the prism (7) in the range corresponding to the information (5) that does not require protection from copying. A copy-preventing medium characterized in that a transparent or colored transparent filling material (9) having a refractive index larger than that of the low refractive index layer (8) is filled between the second surface (11) and the second surface (11) .

  According to a second aspect of the present invention, in the copy prevention medium according to the first aspect, the first surface (10) totally reflects, passes through the prism (7), and is reflected on the second surface (11). The first surface (10) and the second surface (11) are arranged so that the incident angle of the incident document irradiation light is larger than the critical angle of the second surface (11). This is a feature of a copy prevention medium.

According to a third aspect of the present invention, in the copy protection medium according to the first or second aspect , the refractive index of the filling material (9) is ± 0.2 relative to the refractive index of the material of the prism (7). The copy protection medium is characterized by being within the range.

According to a fourth aspect of the present invention, in the copy prevention medium according to any one of the first to third aspects, the first surface (10) and the second surface (11) of the prism (7). The anti-copy medium is characterized in that the angle formed between and is 80 ° to 100 °.

According to a fifth aspect of the present invention, in the copy prevention medium according to any one of the first to fourth aspects, the information (3) to be protected from copying includes a display color and a background color of the information. An anti-copying medium having substantially the same reflectivity.

According to a sixth aspect of the present invention, in the copy-preventing medium according to any one of the first to fourth aspects, the information (3) to be protected from copying is reddish brown or brown according to a black display color. A copy-preventing medium characterized in that a system color is displayed as a background color.
The invention according to claim 7 is formed in an information display layer for displaying information (3) to be protected from copying and a polygonal column, and among the side surfaces, the first surface (10) and the second surface (11). ) On the first surface (10) and the second surface (11) of the prism (7), and a prism layer formed by arranging a plurality of prisms (7) provided facing the information display layer. Each of the document irradiating light of the copying machine, which is in contact with each other and has a low refractive index layer (8) having a lower refractive index than the prism (7), is incident on the prism (7) from an angle within a predetermined range. (7) The first surface (10) is arranged so that an incident angle passing through the first surface (10) and entering the first surface (10) is larger than a critical angle in the first surface (10). The information (3) to be protected from copying is a reflection in which the display color and background color of this information are substantially equal. A copy prevention medium, characterized in that it comprises a.

The invention of claim 8 is formed into a protective column (14) having been subjected to a peelable treatment and a polygonal column, and of the side surfaces, the first surface (10) and the second surface (11) are the A prism layer formed by arranging a plurality of prisms (7) provided to face the protective sheet (14), and a first surface (10) and a second surface (11) of the prism (7), respectively. A low refractive index layer (8) having a refractive index lower than that of the prism (7), and the original irradiating light of the copying machine incident on the prism (7) from an angle within a predetermined range is the prism (7). 7) The prism layer is arranged so that an incident angle that passes through and enters the first surface (10) is larger than a critical angle of the first surface (10). In a range of the first surface (10) of the prism (7) and the prism A transparent or colored transparent filling material (9) having a refractive index larger than that of the low refractive index layer (8) is provided between (7) and the second surface (11) of another prism (7) adjacent thereto. It is a label for an anti-copying medium characterized by being filled .

  According to a ninth aspect of the present invention, in the label for an anti-copy medium according to the eighth aspect, the first surface (10) is totally reflected, passes through the prism (7), and the second surface (11). The first surface (10) and the second surface (11) are arranged so that the incident angle of the original irradiation light incident on the second surface (11) is larger than the critical angle of the second surface (11). This is a copy-preventing medium.

According to a tenth aspect of the present invention, in the label for copy protection medium according to the eighth or ninth aspect, the refractive index of the filling material (9) is within ± 0.2 with respect to the material of the prism (7). This is a label for a copy prevention medium.

The invention of claim 11 is the copy-protection medium label according to any one of claims 8 to 10 , wherein the first surface (10) and the second surface (of the prism (7)) ( 11) is a label for an anti-copying medium, characterized in that the angle formed by 11) is 80 ° to 100 °.

Note that the label for the copy protection medium according to claim 11 claim 8, the protective sheet is removed, by which the information to be protected is attached to attachment object displayed, claim 4 from each claim 1 Can be obtained.

As described above, the present invention has the following effects.
(1) Since the incident angle at which the original irradiation light incident on the prism from the predetermined range is incident on the first surface is larger than the critical angle, the predetermined incident angle among the irradiation light irradiated from the reading head of the copying machine This component is totally reflected at the first surface of the prism. At least a part of the total reflected light is reflected by the second surface and is incident on the reading head of the copying machine, making it difficult to read the copy image of the information and preventing the copying. On the other hand, when the copy-preventing medium is viewed from a viewing angle other than the predetermined range, the prism layer looks transparent, so that there is an effect that information can be easily visually observed.

(2) All of the copying light totally reflected on the first surface is also totally reflected on the second surface and irradiated to the reading head of the copying machine, thereby making the copied image of information more difficult to read. This has the effect of effectively preventing copying.

(3) In a range corresponding to information that does not need to be protected from copying, between the first surface of the prism and the second surface of another adjacent prism, a transparent or higher refractive index than the low refractive index layer Since the colored transparent filling material is filled, the critical angle becomes large on these first and second surfaces, and total reflection hardly occurs. Accordingly, the above-described copy prevention effect does not occur for information that does not require protection from copying, and a copy prevention function can be provided only at a necessary portion.

The present invention is provided with a display layer for displaying information to be protected from copying, for the purpose of providing a copy-preventing medium and the like that can prevent copying of predetermined information and can easily see this information with visible light. For example, a display sheet such as paper, film, card, etc., a prism sheet in which a plurality of triangular prisms provided with the first and second surfaces of the side faces the display body, and a triangular prism shape The first and second surfaces of the prism have air layers in contact with the first surface and the second surface, respectively, and the original irradiation light of the copying machine incident on the triangular prism from an angle within a predetermined range passes through the triangular prism and passes through the first prism. This is realized by arranging the first surface so that the incident angle incident on the first surface is larger than the critical angle in the first surface.
Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.
In this specification, the copy prevention medium means a state in which a prism sheet is applied to a display body on which protected information is displayed, and the copy prevention medium label means a state before being attached to the medium. In this case, the surface of the label coated with the adhesive or adhesive is covered with a sheet such as protective paper or film that has been peeled.

  Examples of such a copy prevention medium include a document on which information that should be prevented from being copied and leaked to a third party, such as confidential information and personal information, a card, and the like.

<About embodiment common to each Example>
FIG. 1 is a perspective sectional view of an essential part of an embodiment of a copy prevention medium to which the present invention is applied.
The copy prevention medium of this embodiment includes a display body 1 which is a copy prevention medium having image information such as characters and photographs displayed on its surface by printing, and a prism sheet 2 attached on the display surface of the display body 1. And is configured.

  On the display surface of the display body 1, protected information 3 that is required to be prevented from being copied is printed at a predetermined location, and copying is prevented in a range other than the range where the information is displayed. The protection-unnecessary information 5 that is not required to be printed is printed.

  The protected information 3 and the protection-unnecessary information 5 are displayed by, for example, printing by a letterpress printing or offset printing printer, printing by a thermal transfer printer, an ink jet printer, a laser printer, or the like. Also, a method other than printing may be used, and handwriting or a photograph may be attached.

  Further, the protected information 3 may be, for example, text information such as a document, name, name, address, card number, password, etc. belonging to confidential matters, and image information such as a drawing, a picture, a photograph.

  When the protected information 3 is character information, it is preferable that the display color (font color) of the character information and the background color thereof have substantially the same reflectance. As an example of such a color combination, for example, the display color may be a black color, and the background color may be a reddish brown color or a brown color.

  On the other hand, the prism sheet 2 which is a prism layer is provided in parallel along a flat film-like base film 6 (see FIG. 2) formed of a transparent material and along the surface of the base film on the display body 1 side. And a plurality of triangular prisms 7 as an example of the polygonal prism. In the present specification, the polygonal prism is a prism having a polygonal cross section orthogonal to the longitudinal direction.

  FIG. 2 is an enlarged cross-sectional view of the copy prevention medium of the present embodiment on the display range of the protected information 3. As illustrated in FIG. 2, the cross-sectional shape of the triangular prism 7 is, for example, a substantially right-angled isosceles triangle. The side surface of the triangular prism 7 corresponding to the bottom of the right-angled isosceles triangle in the cross-sectional shape is in contact with the surface on the display body 1 side of the base film 6, and the other two side surfaces are the surface of the display body 1. In contrast, for example, they are opposed to each other with an inclination of about 45 °.

  Here, the material of the base film 6 is not particularly limited, but it is preferable to use a polymer film because of excellent workability. Examples of the plastic material of the polymer film include polyethylene resin, polypropylene resin, polymethylpentene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, vinyl chloride-vinyl acetate copolymer resin, ethylene -Vinyl acetate copolymer resin, ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, polymethyl methacrylate resin, polycarbonate resin, polyarylate resin, polyimide resin, Polysulfone resin, acrylic resin, etc. can be used. A liquid crystal material can also be used.

  The base film 6 is easier to handle during processing if it has a certain thickness, but if the thickness is too large, the visibility of information printed on the display body 1 decreases. Therefore, the thickness of the base film 6 is preferably in the range of about 12 μm to 100 μm, and more preferably in the range of about 15 μm to 50 μm, for example.

  In the case of this embodiment, the triangular prism 7 is formed in a straight line. A plurality of triangular prisms 7 are provided over the entire surface of the base film 6, and these are adjacent to each other or arranged substantially in parallel with a minute interval.

The material for the triangular prism 7 is not particularly limited, but it is preferable to use a resin material because it is excellent in workability, and it is transparent or colored and transparent because it has optical characteristics that function as a prism. It is required to have a higher refractive index than a low refractive index layer described later. Although the manufacturing method of the prism sheet 2 of the present embodiment will be described in detail later, when this method is applied, the material of the triangular prism prism 7 is obtained by curing an ultraviolet curable ionizing radiation curable resin liquid. It is preferable to use the same.
As such a resin, for example, a prepolymer, an oligomer or a monomer having a polymerizable unsaturated bond or an epoxy group in the molecule can be used alone or in combination.

  Such prepolymers and oligomers include, for example, unsaturated polyesters such as a condensate of an unsaturated dicarboxylic acid and a multi-value alcohol, epoxy resins, polyester methacrylates, polyether methacrylates, polyol methacrylates, methacrylates such as melamine methacrylates, Examples include acrylates such as polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polyol acrylate, and melamine acrylate.

  Examples of the monomer include styrene monomers such as styrene and α-methylstyrene, acrylic acid esters such as methyl acrylate, 2-ethylhexyl acrylate, methoxyethyl acrylate, and butyl acrylate, Methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, methoxyethyl methacrylate, methoxymethyl methacrylate, unsaturated substituted amino alcohol esters such as acrylic acid-2- (N, N-diethylamino) ethyl, acrylamide, Unsaturated carboxylic acid amides such as methacrylamide, polyfunctional compounds such as dipropylene glycol diacrylate, ethylene glycol acrylate, propylene glycol dimethacrylate, diethylene glycol dimethacrylate, vinyl pyrrolidone or 2 in the molecule Polythiol compounds having a more thiol groups, such as trimethylolpropane trithioglycolate, trimethylolpropane tri thio propylate, pentaerythritol thioglycolate, and the like.

In particular, when the prismatic prism 7 is formed by irradiating the ultraviolet curable resin liquid with ultraviolet rays and curing it, a photopolymerization initiator is added to the ultraviolet curable resin liquid which is the ionizing radiation curable resin described above. Or a photosensitizer may be added.
As the photopolymerization initiator, for example, acetophenones, benzophenones, mihira-benzoylbenzoate, α-amyloxime ester, tetramethylmeurum monosulfide, and thioxanthones can be used.
Further, as a photosensitizer, for example, n-butylamine, triethylamine, tri-n-butylphosphine and the like can be mixed and used.

  Further, when the triangular prism prism 7 is formed by the manufacturing method described later, the viscosity of the ionizing radiation curable resin liquid as the material is preferably 5000 cps or less, and more preferably 1000 cps or less. Further, when the triangular prism 7 is colored and transparent, a dye that does not inhibit the curing of the ionizing radiation curable resin liquid may be added.

  The height of the triangular prism 7 from the surface of the base film 6 is preferably, for example, about 1 μm to 100 μm, and more preferably about 5 μm to 25 μm. If the height is 1 μm or less, a diffraction phenomenon occurs and the effect of preventing copying is impaired, and if the height is 100 μm or more, the thickness becomes too large when a copy-preventing medium is attached to a display body. is there.

  A space is formed between the side surface of the triangular prism 7 and the side surface of the other adjacent triangular prism 7 in a range corresponding to the protected information 3 of the display body 1. The air layer 8 is a low refractive index layer having a refractive index lower than that of the material of the triangular prism 7.

  On the other hand, a transparent or translucent filling material is filled between the side surface of the triangular prism 7 and the side surface of another adjacent triangular prism 7 in a range corresponding to the protection-unnecessary information 5 of the display body 1. A filled resin layer 9 is formed. FIG. 3 is an enlarged cross-sectional view of the copy prevention medium at the boundary between the display range of the protected information 3 and the range corresponding to the protection-unnecessary information 5.

  Here, the material of the filling resin layer 9 is transparent or colored and transparent, and has a refractive index higher than at least the low refractive index layer (in the present embodiment, the air layer 8). The difference in refractive index is preferably within ± 0.2, more preferably within ± 0.1. In particular, it is preferable to have substantially the same refractive index as the material of the triangular prism 7. This is because the refraction at the interface between the filling resin layer 9 and the triangular prism 7 becomes small and can be seen through without a sense of incongruity.

  For example, various polymer resins having a refractive index of about 1.4 to 1.6 can be used as the material for the filling resin layer. For example, polybutyl acrylate (refractive index 1.44), polyethyl acrylate (refractive index 1.47), polymethyl acrylate (refractive index 1.47), poly n-butyl methacrylate (refractive index 1.48), polymethyl Methacrylate (refractive index 1.49), polyvinyl acetate (refractive index 1.47), polypropylene (refractive index 1.49-1.50), polyethylene (refractive index 1.5-1.55), polycarbonate (refractive index 1.58), polystyrene (refractive index 1.59-1.60), polyethylene terephthalate (refractive index 1.64), polyvinyl chloride (refractive index 1.54), polyvinylidene chloride (refractive index 1.60-1). .63) can be used alone or in combination as a material for the filled resin layer 9.

When such a polymer resin is filled by a printing method, printing can be performed using a medium ink composed only of a vehicle containing little or no colorant such as a pigment or a dye. Moreover, when coloring this polymer resin, it is good to use dye or a pigment suitably. As a printing method, for example, silk screen printing or gravure printing can be used. The filling is preferably performed so that the valleys formed between the triangular prisms 7 are filled uniformly so that the ridge line where the height from the base film 6 of the triangular prisms 7 becomes maximum is filled. Even if some foreign matter such as air remains, the effect of the present invention can be exhibited.
Then, during this printing, a pattern is formed on the prism sheet 2 with a range in which the resin is filled and a range in which the resin is not filled.

Then, the above-described prism sheet 2 is adhered to the display body 1 with, for example, an adhesive or an adhesive, thereby completing a copy prevention medium.
Further, by applying a transparent or colored transparent adhesive or adhesive to the prism sheet 2, and sticking a protective sheet for preventing drying, chemical change or contamination of the adhesive, etc. on the application surface, The label for the copy protection medium is completed.

  When such a label is used, the copy protection medium can be obtained by removing the protective sheet and sticking it to a desired display body on which information to be protected from copying is displayed. In addition, about the sticking method of the prism sheet 2 and the display body 1 or the prism sheet 2 and a protective sheet, it demonstrates in detail in the Example mentioned later.

As such a pressure-sensitive adhesive or adhesive, for example, a mixture of an elastomer such as natural rubber, recycled rubber, SBR, a low molecular weight or medium molecular weight tackifier, an antioxidant, etc. is diluted with a solvent to obtain a solution solvent. Can be used.
Moreover, when using a thermoplastic elastomer, it can apply | coat to a prism sheet in the state melted by heating.
Furthermore, when resistance to light and oxidation is required, materials such as acrylate copolymer and polyisobutylene can be used.
Furthermore, you may use a hot-melt-type heat seal agent as an adhesive or an adhesive. In addition, when applying these by a printing method, it is necessary to consider printability especially.
In addition, the thickness which coats these adhesives or adhesives is about 1 micrometer to 50 micrometers, for example.

<About the manufacturing method and manufacturing apparatus of a prism sheet>
Next, a manufacturing method and a manufacturing apparatus for the prism sheet 2 used for the above-described anti-copy medium and anti-copy medium label will be described.
This manufacturing method includes a filling process, a contact process, a curing process, an adhesion process, and a peeling process.

  The filling step is a step of filling an ionizing radiation curable resin liquid that is a material of the triangular prism prism 7 into a concave portion that is formed on the surface of the cylindrical roll intaglio and functions as a female mold of the triangular prism prism 7.

  A contact process supplies the base film 6 to the surface of the roll intaglio in which the ionizing radiation curable resin liquid was filled in the recessed part, and wound the base film 6 on the roll intaglio, It is a step of bringing the ionizing radiation curable resin liquid into contact.

  The curing step is a step in which the ionizing radiation curable resin liquid in contact with the substrate film 6 is cured by irradiating with ionizing radiation to obtain a semi-cured product.

  The adhesion process is a process of bringing the substrate film 6 and the ionizing radiation curable resin liquid or the resin cured thereof into close contact with each other by pressing. In addition, this process may be performed simultaneously with the hardening process mentioned above. This point will be described in detail later.

  The peeling process is a process of peeling the base film 6 and the cured ionizing radiation curable resin (triangular prism 7) formed in close contact with the base film 6 from the intaglio roll.

  Next, a prism sheet manufacturing apparatus used in each process described above will be described, and each process will be described in more detail. FIG. 4 is a diagram showing the configuration of the prism sheet 2 manufacturing apparatus. As shown in FIG. 4, this manufacturing apparatus includes a roll intaglio 101, a coating apparatus 102, a solvent drying apparatus 103, a pressing roll 104, a curing apparatus 105, a feeding roll 106, a feeding roll 107, and curing. Device 108. Hereinafter, each part is explained in full detail.

  The roll intaglio 101 is formed in a columnar shape or a cylindrical shape, and a concave portion 109 that functions as a female mold for molding the triangular prism prism 7 is formed on the outer peripheral surface thereof. The recesses 109 are grooves having a V-shaped cross section extending along the axial direction of the roll intaglio 101 and are distributed over the entire outer peripheral surface of the roll intaglio 101. The concave portion is formed by, for example, cutting a plate material provided on the outer peripheral surface of the roll intaglio 101 with a machining device such as a lathe or shaping it using an electroforming method. In the present embodiment, the concave portion 109 extends along the axial direction of the roll intaglio 101, but is not limited thereto, and may extend along the circumferential direction of the roll intaglio 101. Further, the roll intaglio 101 may be skewed with respect to the circumferential direction.

  The coating device 102 has a function of applying an ionizing radiation curable resin liquid 110, which is a material of the triangular prism 7, to the outer peripheral surface of the roll intaglio 101 and filling the recess 109. The coating apparatus 102 is provided to face the outer peripheral surface of the roll intaglio 101, and specifically, for example, is configured as a nozzle coating apparatus. The nozzle coating device is configured in a T-die shape and includes a rectangular or linear discharge port in a predetermined direction. And the longitudinal direction of this discharge port is arrange | positioned substantially parallel to the axial direction of the roll intaglio 101. FIG. This coating apparatus discharges the ionizing radiation curable resin liquid 110 only to a predetermined width portion of the surface width of the surface of the roll intaglio 101 and a surface on a predetermined phase on the circumference of the roll intaglio 101. It has become. The coating thickness of the ionizing radiation curable resin liquid 110 is such that the ionizing radiation curable resin liquid 110 is sufficiently contained in the recess 109 when the base film 6 is pressed against the roll intaglio 110 in the adhesion step described later. It is set so that it is filled and not redundant.

  The solvent drying device 103 is a device for volatilizing the solvent contained in the ionizing radiation curable resin liquid 110 applied to the outer peripheral surface of the roll intaglio 101. Specifically, a hot air heater, an infrared heater, or the like can be used as the solvent drying device 103. By providing this solvent drying apparatus 103, the solvent-type ionizing radiation curable resin liquid 110 can be used, and the range of selection of the resin to be used can be expanded. Further, when a solvent-type ionizing radiation curable resin liquid is used, the fluidity of the resin liquid can be adjusted by the amount of the solvent for diluting the resin. In the case where a solventless type is used as the ionizing radiation curable resin liquid 110, the solvent drying device 103 is not necessary.

  The pressing roll 104 is a roller formed in a cylindrical shape or a columnar shape, and its axial direction is arranged in parallel with the roll intaglio 101. When the roll intaglio 101 rotates, the press roll 104 rotates in synchronization so that the speed of the surface of the press roll 104 is substantially the same as the speed of the surface of the roll intaglio 101. Then, the base film 6 of the prism sheet 2 is supplied from a supply device (not shown) to the pressing roll 104, is driven by the rotation of the pressing roll 104, contacts the surface of the roll intaglio 101, and then comes off from the pressing roll 104 and rolls. Along the surface of the intaglio 101, it travels following its rotation.

The curing device 105 includes an ionizing radiation source that irradiates the ionizing radiation to the ionizing radiation curable resin liquid that contacts the base film 6 and travels along with the roll intaglio 101.
Here, ionizing radiation refers to electromagnetic waves or charged particles having energetic particles capable of polymerizing or crosslinking molecules. As this ionizing radiation, for example, ultraviolet rays or electron beams can be used. When ultraviolet rays are used, a light source such as an ultrahigh pressure mercury lamp, a black light lamp, a xenon lamp, or a metal halide lamp can be used as an ionizing radiation source.

In the case of the present embodiment, in addition to the curing device 105, another curing device 108, which will be described later, is provided on the front side of the base film 6 in the traveling direction. And in order to prevent the distortion of hardened | cured material and the curling of the base film 6 by making a hardening process multistage, the hardening apparatus 105 does not harden the ionizing radiation-curable resin liquid 110 completely, and what is called a semi-hardened material 110a In other words, the curing device 108 is completely cured. Therefore, in the curing device 105, it is sufficient that at least the fluidity of the ionizing radiation curable resin liquid 110 is lost and the resin is cured to such an extent that adhesion with the base film 6 is caused.
In the case of the present embodiment, the curing device is provided outside the roll intaglio 101, but the roll intaglio is formed in a cylindrical shape with a material having good ionizing radiation permeability, such as quartz or glass. In this case, a curing device may be provided on the inner diameter side of the roll intaglio.

The feed roll 106 is a cylindrical or columnar roller provided in parallel with the roll intaglio 101 and in the axial direction, and is provided with a part of its outer peripheral surface in contact with the roll intaglio 101.
The base film 6 and the semi-cured product 110a that have passed through the range irradiated with ionizing radiation by the curing device 105 and traveled along with the roll intaglio 101 are peeled off from the roll intaglio 101 here, and the circumference of the feed roll 106 is removed. After traveling along a part of the upper part, it travels in a planar manner until another feed roll 107 described later.

  The feed roll 107 is a cylindrical or columnar roll spaced apart from the feed roll 106 and arranged in parallel in the axial direction. The feed roll 107 is in contact with the surface of the base film 6 that travels in a flat plane away from the feed roll 106 on the outer peripheral surface thereof, and the semi-cured product 110a is not attached thereto. Change direction.

  The curing device 108 includes an ionizing radiation source similar to that of the curing device 105 described above, and emits ionizing radiation to the semi-cured material 110a formed on the base film 6 running along the surface of the feed roll 107. Irradiation is performed to sufficiently cure the semi-cured product 110a, and the triangular prism prism 7 is completed. Note that while the semi-cured product 110 a is cured by the curing device 108, the base film is curled in the direction opposite to that when passing through the curing device 105. For this reason, the “curl” that is applied to the base film 6 when passing through the curing devices 105 and 108 is offset, and curling of the prism sheet 2 that is a finished product is prevented.

Next, the principle of copy prevention in the copy prevention medium of this embodiment will be described. FIG. 5 shows a triangular prism prism 7 of a copy prevention medium according to the present embodiment, in which two side surfaces on the display body 1 side are in contact with an air layer 8 as a low refractive index layer, respectively. FIG. 6 is a diagram showing a locus of light when irradiation light emitted from the reading head enters from the normal direction of the copy prevention medium.
As shown in FIG. 5, the light enters from the surface of the prism sheet 2 on the base film 6 side, propagates through the base film 6 and the triangular prism prism 7, and reaches the display body 1 among the side surfaces of the triangular prism prism 7. The incident angle that is incident on the first surface 10 that faces is θ1. The incident angle refers to an angle formed by the normal direction of the boundary surface of the medium (in this case, the interface between the triangular prism 7 and the air layer 8) and the direction in which the light enters. When the incident angle θ 1 is larger than the critical angle θt on the first surface 10, the irradiated light is totally reflected on the first surface and does not enter the air layer 8. The critical angle θt is expressed as θt = arcsin (a / b), where a is the refractive index of the air layer 8 as a low refractive index and b is the refractive index of the triangular prism 7.

  Accordingly, the angle formed by the material of the triangular prism 7 and the first surface of the triangular prism 7 with respect to the surface of the display body 1 is set in consideration of the above-described total reflection. For example, when the triangular prism 7 is made of a material having a refractive index of 1.5, the refractive index of the air layer is 1, so that the critical angle θt = 41.8 °. In the case of the present embodiment, for example, the incident angle of the light emitted from the copying machine incident from the normal direction of the copy prevention medium to the first surface is approximately 45 °. The light is totally reflected, and the reflected light propagates through the triangular prism prism 7 toward the second surface 11 substantially parallel to the surface of the display body 1.

  And the incident angle to the 2nd surface 11 of the reflected light totally reflected in the 1st surface 10 also becomes about 45 degrees. Since this incident angle is also larger than the above-mentioned critical angle, total reflection occurs also on the second surface 11, and this reflected light is reflected in the substantially normal direction of the copy prevention medium.

  As described above, according to the present embodiment, the components in the predetermined direction of the irradiation light emitted from the copying machine are totally reflected on the first surface and the second surface, respectively, and the display object 1 is covered. Since it enters the reading head of the copying machine without reaching the display surface of the protection information 3, there is an advantage that the copying of the protected information 3 on the display body 1 by the copying machine can be prevented. At this time, the copy image is the same as that when the mirror surface is copied. For example, in the case of a monochrome copying machine, the copy image is blackened.

  Note that the irradiation light of the copying machine is usually scattered light, and the irradiation light incident on the copy-preventing medium contains components in various directions, part of which does not cause total reflection on the first surface, It may pass through the prism sheet 2 and reach the surface of the display body 1. If the reflected light on the surface of the display body 1 is also scattered light, the reflected light from the surface of the display body 1 can enter the reading head, so that a copy image is formed even with the protected information 3. It can be done. However, when the above-described total reflection light is incident on the reading head at the same time, the copied image becomes extremely difficult to read.

  FIG. 5 shows the case where the light incident from the copying machine is totally reflected on the first surface and the second surface, respectively, but if the total reflection occurs at least on the first surface, the second Even if the surface is not totally reflected but partly reflected and the other part is transmitted to the display body 1 side, this reflected light is incident on the reading head, so that the copy can be prevented. There is.

  On the other hand, in the range corresponding to the protection-unnecessary information 5 on the display body 1, the filling resin layer 9 is in contact with the first surface 10 and the second surface 11 of the triangular prism 7, and thus the total reflection described above. The irradiation light emitted from the copying machine is transmitted through the first surface 10 and propagates through the filling resin layer 9 and reaches the surface of the display body 1. Irradiation light that reaches the surface of the display body 1 is reflected as scattered light, and a part of the incident light enters the reading head of the copying machine. As a result, the protection-unnecessary information 5 is normally copied by the copying machine. Further, even when information that should be protected from copying and information that does not need to be protected coexist on the same display body, there is an advantage that it is possible to prevent copying only at necessary portions. In such a range, information can be visually recognized from all viewing angles.

  Further, when visually confirming the protected information 3 displayed on the display body 1, if the viewing angle is viewed from an angle range smaller than the critical angle θt on the first surface, the total reflection described above does not occur, There is an advantage that it can be easily observed.

  Furthermore, since the display color of the character information and the background color have substantially the same reflectance, even in the monochrome copying machine, even when the copy prevention effect is not sufficiently obtained by the prism sheet 2, In copy images, character information can be easily hidden in the background, making it possible to prevent copying. In particular, when the display color is black and the background color is reddish brown or brown, the copy image is easily blackened, and a high copy prevention effect is obtained.

  Next, a more detailed example in the above-described embodiment of the present invention will be described.

  FIG. 6 is an external perspective view of the ID card according to Example 1 in the embodiment of the copy protection medium of the present invention. As shown in FIG. 6, a card 1a, which is a display body provided with a display layer, is formed on a substantially rectangular plate. On the display layer of the card 1a, protected character information 3a required to be prevented from being copied and protected person image information 3b are displayed by printing. And the protection-unnecessary information 5 is displayed in the range other than these information. The prism sheet 2 is provided over the entire surface of the card 1a, and the filling resin layer 9 is formed over the entire range other than the protected character information 3a and the protected image information 3b.

  FIG. 7 is an enlarged cross-sectional view of the ID card of FIG. FIG. 7 is an enlarged cross-sectional view of a copy prevention medium label used in the ID card of FIG. In the present embodiment, a polyethylene terephthalate (PET) film having a thickness of 50 μm is used as the base film 6, and a urethane acrylate-based ultraviolet curable resin liquid is molded and cured by the above-described manufacturing method. A triangular prism prism 7 having a right isosceles triangular cross-section having an angle (vertical angle) between the first surface 10 and the second surface 11 of 90 ° and a height of 25 μm from the base film is formed. The prism sheet 2 was obtained.

  Next, transparent acrylic is used as the filling resin layer 9 by using a silk screen printing method so as to fill the valleys (concave portions) between the triangular prisms 7 corresponding to the range corresponding to the protection-unnecessary information 5 on the card 1. System ink (“SS8-800 medium” manufactured by Toyo Ink Co., Ltd.) was filled.

  Next, a polyester heat seal agent 13 as an adhesive was applied to the PET film 12 having a thickness of 25 μm, which functions as a support for the prism sheet 2, in a layer form having a thickness of 5 μm. Then, the surface of the prism sheet 2 on which the above-mentioned acrylic ink has been printed, on the side where the triangular prisms 7 are formed, and the surface of the PET film 12 coated with the heat sealant 13 are pasted by lamination. did. Lamination was performed under conditions of a roll temperature of 150 ° C. and a speed of 0.8 m / min. Further, an adhesive 15 is applied to the protective paper 14 which is a protective sheet obtained by performing a peeling process by silicone processing on the surface of the paper, and the PET film 12 is opposite to the prism sheet 2 as shown in FIG. Adhered to the side surface, a label for a copy prevention medium was produced.

  Then, the protective paper is removed from the copy prevention medium label, and the portion of the card 1 where the protected character information 3a including the personal name and the protected image information 3b are displayed is replaced with the filling resin layer 9 of the prism sheet 2. The ID card was a copy-preventing medium.

When the ID card is visually observed, the surface of the ID card is a mirror surface in a state where the viewing angle is tilted about an axis orthogonal to the front surface (normal direction) of the ID card and the longitudinal direction of the triangular prism 7. The personal name could not be seen.
On the other hand, when observing from the normal direction of the ID card while gradually tilting the viewing angle about the axis parallel to the longitudinal direction of the triangular prism 7, it looks like a mirror surface at first, but at a certain viewing angle. You can now see your personal name.
Then, when the portion where the personal name of the ID card is displayed was copied by a copying machine, the portion corresponding to the area without the filling resin layer in the prism sheet 2 was blackened on the copy image. The name was not visible.

  FIG. 9 is an enlarged cross-sectional view of an ID card according to Example 2 in the embodiment of the copy protection medium of the present invention. FIG. 10 is an enlarged cross-sectional view of a copy prevention medium label used for the copy prevention medium of this embodiment. Note that, in each embodiment described below, the same reference numerals are assigned to portions common to the above-described embodiment 1, and the description thereof is omitted, and differences are mainly described.

  In this example, the maximum height of the triangular prism 7 from the surface of the base film 6 was set to 15 μm. Then, a transparent polyester hot melt ink (prototype ink) is filled in the valley between the triangular prisms 7 at the outer edge of the prism sheet 2 by a gravure printing method instead of the transparent acrylic ink of Example 1. This was used as the filling resin layer 9. At this time, the ink pan of the hot melt ink was heated to keep the ink in a molten state.

A PET film 12 having a thickness of 25 μm was directly attached to the filled resin layer 9 as a support by laminating. Therefore, in the case of this example, there is no layer corresponding to the heat seal agent 13 in Example 1. In addition, when the material of the filling resin layer 9 also serves as an adhesive good or an adhesive as in this embodiment, the material includes a refractive index required for the filling resin layer and a desired adhesive force or adhesive force. It is necessary to have.
Then, as shown in FIG. 10, an adhesive 15 was applied to the protective paper 14 and adhered to the surface of the PET film 12 opposite to the prism sheet 2 to produce a copy prevention medium label.

  Then, the protective paper was removed from this anti-copying medium label, and the prism sheet 2 was adhered to the surface of the card 1a to obtain an ID card.

When this ID card was visually observed in the same manner as in Example 1 and copying was attempted, the same result as in Example 1 was obtained.
As described above, according to the present embodiment, the PET film 12 and the prism sheet 2 are adhered by the adhesive or pressure-sensitive adhesive filled in the filling resin layer 9, so that the above-described embodiment 1 is There is an advantage that the configuration is simplified.

FIG. 11 is an enlarged sectional view of an ID card according to Example 3 in the embodiment of the copy preventing medium of the present invention.
As shown in FIG. 11, in this example, as the material of the filling resin layer 9, as in Example 2, a pressure-sensitive adhesive or an adhesive is used, and the coating thickness is a triangular prism shape in the coating range. The valleys between the prisms 7 are filled, and a pressure-sensitive adhesive or adhesive layer 16 having a predetermined thickness is further formed thereon.

  The anti-copy medium label used for the anti-copy medium of this embodiment is constituted by sticking a protective paper on the surface of the adhesive or adhesive layer 16 (not shown). Further, the ID card of the present embodiment is configured by sticking the card 1a directly on the surface of the pressure-sensitive adhesive or adhesive layer 16, as shown in FIG. Therefore, the pressure-sensitive adhesive or adhesive used in this example is required to have a refractive index required for the material of the filled resin layer and to maintain the pressure-sensitive adhesiveness or adhesiveness for a predetermined time after application. .

  As described above, according to this example, in addition to the same effects as those of Example 1, the PET film 12 as a support and the pressure-sensitive adhesive for adhering the card 1a and the PET film 12 or Since no adhesive is required, there is an advantage that the configuration is further simplified.

  FIG. 12 is an enlarged cross-sectional view of an ID card according to Example 4 in the embodiment of the copy protection medium of the present invention. As shown in FIG. 12, in this example, the prism sheet 2 having the filled resin layer 9 formed thereon is prepared in the same manner as in Example 1, and the pressure-sensitive adhesive or adhesive layer 17 is used as the triangular prism 7 of the prism sheet 2. It is provided over the entire surface of the side. In this case, for example, the adhesive or adhesive may be applied to the protective paper 14 side and then attached to the prism sheet 2, or the adhesive or adhesive may be applied to the prism sheet 2 side, You may affix on the protective paper 14. FIG. As a result, the label for the copy preventing medium of this embodiment is formed. And the ID card | curd of a present Example is formed by removing the protective paper 14 and sticking the adhesive or the adhesive bond layer 17 on the surface of the card | curd 1a similarly to each Example mentioned above. Also in the present embodiment, the same effects as in the first embodiment can be obtained.

In the above-described embodiment, the cross-sectional shape of the triangular prism prism 7 is a substantially isosceles triangle, but the shape is not limited to this and may be another shape. For example, even if a simple isosceles triangle, a right triangle, or a triangle that does not fall under any of these conditions, the effect of the present invention can be achieved as long as the conditions for totally reflecting the light emitted from the copying machine from a predetermined incident angle are satisfied. Can play.
For example, as shown in FIG. 13, the cross-sectional shape of the triangular prism may be a right triangle that is not isosceles, and the hypotenuse may be in contact with the substrate film. In this case, the range of the incident angle of the light beam causing total reflection varies from the above-described embodiment. However, since the irradiation light of the copying machine is normally diffused light, it has components in various directions, and the irradiation light component incident from a predetermined angle causes total reflection, so that copying can be prevented. Moreover, you may use the polygonal columnar prism which has cross-sectional shapes other than a triangle. Further, in each of the above-described embodiments, the triangular prism 7 is formed in a linear shape, but may be a curved shape.

  In the above-described embodiments, the low refractive index layer is an air layer. However, even if it is a gas, liquid, or solid material other than air, it has transparency and its refractive index is the material of the prism. On the other hand, it can be used as a low refractive index layer if it is low enough to satisfy the above-mentioned conditions for causing total reflection. Further, the inside of the low refractive index layer may be evacuated.

  The anti-copy medium and the anti-copy medium label of the present invention have the property that they can be seen only from a specific viewing angle, so they are used not only for anti-copying purposes but also for side peek prevention, signs, advertisements, etc. You can also. In this case, when the filling resin layer is formed on, for example, a logo or a picture, these logos and the like can be seen only from a predetermined viewing angle, and a design effect can also be achieved.

1 is an enlarged perspective sectional view of an embodiment of a copy prevention medium according to the present invention. FIG. FIG. 2 is an enlarged cross-sectional view of the copy protection medium of FIG. 1 on a display range of protected information. FIG. 2 is an enlarged cross-sectional view of a boundary between a display range of protected information and a display range of protection-unnecessary information in the copy prevention medium of FIG. 1. It is a figure which shows the structure of the manufacturing apparatus of the prism sheet of this embodiment. It is a figure which shows the principle of copy prevention in this embodiment. 1 is an external perspective view of an ID card of Example 1. FIG. It is an expanded sectional view of the ID card of FIG. It is an expanded sectional view of the label for copy prevention media used for the ID card of FIG. It is an expanded sectional view of the ID card which concerns on Example 2 of the copy prevention medium by this invention. FIG. 10 is an enlarged cross-sectional view of a copy prevention medium label used in the ID card of FIG. 9. It is an expanded sectional view of the ID card which concerns on Example 3 of the copy prevention medium by this invention. It is an expanded sectional view of the ID card which concerns on Example 4 of the copy prevention medium by this invention. FIG. 5 is an enlarged cross-sectional view of another embodiment of the copy-preventing medium according to the present invention, in which the cross-sectional shape of a triangular prism is a right triangle that is not isosceles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display body 1a Card 2 Prism sheet 3 Protected information 3a Protected character information 3b Protected person photograph information 5 Protection unnecessary information 6 Base film 7 Triangular prism 8 Air layer 9 Filling resin layer 10 1st surface 11 2nd Surface 12 PET film 13 Heat seal agent 14 Protective paper 15 Adhesive 16 Adhesive or adhesive layer 101 Roll intaglio plate 102 Coating device 103 Solvent dryer 104 Press roll 105 Curing device 106 Feed roll 107 Feed roll 108 Curing device 109 Concave 110 Ionizing radiation curable resin liquid 110a Semi-cured product

Claims (11)

An information display layer for displaying information to be protected from copying;
A prism layer formed by arranging a plurality of prisms that are formed in a polygonal column shape, and the first surface and the second surface of the side surfaces are opposed to the information display layer;
A low refractive index layer in contact with each of the first surface and the second surface of the prism and having a refractive index lower than that of the prism;
The incident angle at which the original irradiating light of the copying machine incident on the prism from an angle within a predetermined range passes through the prism and is incident on the first surface is larger than the critical angle on the first surface. a first surface arranged,
The information includes information that should be protected from copying and information that does not need to be protected from copying.
In a range corresponding to information that does not need to be protected from copying, a refractive index between the first surface of the prism and a second surface of another prism adjacent to the prism is higher than that of the low refractive index layer. An anti-copying medium characterized by being filled with a large transparent or colored transparent filling material . The copy protection medium according to claim 1,
The incident angle of the original irradiation light that is totally reflected by the first surface, passes through the prism and is incident on the second surface, is larger than the critical angle on the second surface. A copy-preventing medium comprising a first surface and a second surface. In the copy protection medium according to claim 1 or 2 ,
The anti-copy medium, wherein the refractive index of the filling material is within ± 0.2 with respect to the refractive index of the material of the prism. The copy-preventing medium according to any one of claims 1 to 3 ,
An anti-copy medium, wherein an angle formed by the first surface and the second surface of the prism is 80 ° to 100 °. In the copy-preventing medium according to any one of claims 1 to 4 ,
The information to be protected from copying is a copy prevention medium characterized in that the display color of this information and the background color have substantially the same reflectance. In the copy-preventing medium according to any one of claims 1 to 4 ,
The information to be protected from copying is displayed in a red-brown or brown-brown color as a background color depending on a black display color. An information display layer for displaying information to be protected from copying;
A prism layer formed by arranging a plurality of prisms that are formed in a polygonal column shape, and the first surface and the second surface of the side surfaces are opposed to the information display layer;
A low refractive index layer in contact with each of the first surface and the second surface of the prism and having a refractive index lower than that of the prism;
The incident angle at which the original irradiating light of the copying machine incident on the prism from an angle within a predetermined range passes through the prism and is incident on the first surface is larger than the critical angle on the first surface. The first surface is placed on
The information to be protected from copying is such that the display color of this information and the background color have substantially the same reflectance.
An anti-copying medium characterized by A protective sheet that has been subjected to a peelable treatment,
A prism layer formed by arranging a plurality of prisms that are formed in a polygonal column shape, and the first surface and the second surface of the side surfaces are opposed to the protective sheet;
A low refractive index layer in contact with each of the first surface and the second surface of the prism and having a refractive index lower than that of the prism;
The incident angle at which the original irradiating light of the copying machine incident on the prism from an angle within a predetermined range passes through the prism and is incident on the first surface is larger than the critical angle on the first surface. a first surface arranged,
In a range of a part of the prism layer, a transparent layer having a refractive index larger than that of the low refractive index layer between the first surface of the prism and a second surface of another prism adjacent to the prism, or A label for an anti-copying medium, which is filled with a colored transparent filling material . The label for copy protection medium according to claim 8,
The incident angle of the original irradiation light that is totally reflected by the first surface, passes through the prism and is incident on the second surface, is larger than the critical angle on the second surface. A label for a copy-preventing medium, wherein the first surface and the second surface are arranged. In the label for copy-preventing media according to claim 8 or 9 ,
The anti-copy medium label according to claim 1, wherein a refractive index of the filling material is within ± 0.2 with respect to a refractive index of the material of the prism. The label for a copy-preventing medium according to any one of claims 8 to 10 ,
An anti-copy medium label, wherein an angle formed by the first surface and the second surface of the prism is 80 ° to 100 °.

Images