JP2022113943A - Display body - Google Patents

Abstract

To discriminate an original and a copy by naked eyes or observation enlarged with low magnification.SOLUTION: A display body 1 includes: a light permeable base material 11 having first and second main surfaces; a first colored layer 12 that includes a first colored part 121 and a first non-colored part 122 that are alternately arranged on the first main surface, wherein the first colored part 121 permeates first colored light when the first colored part 121 is illuminated with white light, the first non-colored part 122 does not color and permeates the white light when the first non-colored part 122 is illuminated with the white light, and a distance between the first non-colored parts 122 is within a range of 5 μm or more and 20 μm or less; and a second colored layer 13 that includes a second colored part 131 and a second non-colored part 132 that are alternately arranged on the second main surface, wherein the second colored part 131 permeates second colored light whose color is different from first colored light when the second colored part 131 is illuminated with white light, the second non-colored part 132 does not color and permeates the white light when the second non-colored part 132 is illuminated with the white light, and a distance between the second non-colored parts 132 is within a range of 5 μm or more and 20 μm or less.SELECTED DRAWING: Figure 2

Description

The present invention relates to display bodies.

2. Description of the Related Art As the performance of color copiers has improved in recent years, it has become easier to forge securities such as stock certificates and bonds, as well as various certificates. For this reason, a copy-preventing medium that can be distinguished from copies is sometimes used for these articles.

The anti-copying medium is a recording medium to which anti-counterfeiting technology is applied to prevent or restrain counterfeiting by color copiers and the like. As a copy-preventing medium, for example, a copy obtained by using a color copier displays a pattern such as specific characters or pictures that cannot be seen in the original.

As one of anti-counterfeiting techniques, there is a so-called "watermarking technique" in which a distribution of fiber density and thickness is generated in paper, and a pattern corresponding to the distribution is visually recognized when observing transmitted light. This watermarking technology is a technology that enables authenticity determination under any environment as long as there is a certain amount of light or more. In addition, because of its outstanding name recognition, it is still used for banknotes and the like around the world, even though it is a technology that has existed for a long time.

However, the structure described above for this watermarking technique must be formed at the paper manufacturing stage. Therefore, the watermarking technique described above is not readily available to non-paper manufacturers. In addition, paper that employs the watermark technology described above is expensive to manufacture.

In view of these problems, there are cases in which a technology is used that enables the visual effects obtained by the above watermark technology to be simulated.

For example, penetrating transparent ink is printed on paper so that the areas printed with the transparent ink have a higher transmittance than the areas not printed with the transparent ink, thereby There is an anti-counterfeiting technology that enables a pattern corresponding to an area printed with transparent ink to be visible when the transmitted light is observed with the naked eye (see Patent Document 1).

In addition, as another technique for making it possible to simulate the visual effect obtained by the above watermark technique, light-shielding ink of the same color as the paper is printed on the paper, and the transmittance of the area printed with the light-shielding ink is reduced. , the transmittance of the area where the light-shielding ink is not printed is made lower than that of the area where the light-shielding ink is not printed, so that when the transmitted light is observed with the naked eye, the pattern corresponding to the area where the light-shielding ink is printed is made visible for anti-counterfeiting. A technique exists (see Patent Document 2).

The above anti-counterfeiting technology makes the pattern corresponding to the area printed with transparent ink or light-shielding ink invisible or difficult when observing the reflected light with the naked eye, and when observing the transmitted light with the naked eye Visible or easily visible. Alternatively, the printed pattern may be different in color from the paper and may include first and second regions, the first region having the same hue as the second region and having a higher lightness and a lower lightness compared to the second region. Formed to have transmissivity so that the first and second regions are distinguishable or readily distinguishable from one another when viewed with the unaided eye in reflected light, and the first and second regions when viewed with the unaided eye in transmitted light. Anti-counterfeiting techniques also exist that make regions indistinguishable or difficult from each other (see US Pat.

JP-A-6-228900 Japanese Patent Application Laid-Open No. 2001-26177 JP-A-2015-96308

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique that makes it possible to distinguish between an original and a duplicate with the naked eye or by observation under low magnification.

According to one aspect of the present invention, a light-transmissive substrate having a first main surface and a second main surface that is the back surface thereof, first colored portions arranged alternately on the first main surface, and A first non-colored part is included, wherein the first colored part transmits the first colored light when illuminated with white light, and the first non-colored part colors the white light when illuminated with white light. a first colored layer in which a distance between the first non-colored portions adjacent in the arrangement direction of the first colored portion and the first non-colored portion is within a range of 5 μm or more and 20 μm or less; A second colored portion and a second uncolored portion alternately arranged on the second main surface corresponding to the first colored portion and the first uncolored portion, and the second colored portion was illuminated with white light. a second colored light having a color different from that of the first colored light is transmitted therethrough, and when the second uncolored portion is illuminated with white light, the white light is transmitted without being colored, and is adjacent in the arrangement direction. and a second colored layer in which the distance between the matched second non-colored portions is in the range of 5 μm or more and 20 μm or less.

In copying by a color copier, first, the scanner section reads an image displayed by an original. Specifically, the scanner unit reads an image by placing a diffuse reflector on the back of the original, illuminating the front of the original with white light, and receiving the reflected light. The scanner unit outputs scan data corresponding to data of the read image to the processing unit. The processing section generates print data from this scan data and outputs it to the printer section. The printer section prints on the base material based on the print data.

In the display member described above, the second colored portions and the second uncolored portions are alternately arranged corresponding to the first colored portions and the first uncolored portions. That is, the arrangement direction of the second colored portion and the second uncolored portion is the same as the arrangement direction of the first colored portion and the first uncolored portion. The second colored portion and the second uncolored portion are arranged, for example, so as to face the first uncolored portion and the first colored portion, respectively. Also, the distance between the first non-colored portions and the distance between the second non-colored portions are short.

Therefore, in the transmission image, if the distance between the first and second colored parts that appear to be adjacent to each other is sufficiently short, the scanner unit combines the first and second colored parts into the first It may be read as a single colored portion having a color resulting from the subtractive color mixing of the color of the colored light and the color of the second colored light. In this case, the image reproduced from the scan data output by the scanner unit does not match the transparent image displayed on the original. Therefore, the transparent image displayed on the copy obtained by printing based on the print data generated from this scan data also does not match the transparent image displayed on the original.

Also, in many color copiers, the printer section does not have sufficient print resolution to reproduce separate first and second colored sections that are sufficiently short from each other. Therefore, even if the scanner unit has a high optical resolution or reading resolution and can read the first colored portion and the second colored portion separately, the processing unit has a higher resolution than the scan data. By generating low print data and printing based on this print data, the transparent image displayed by the duplicate does not match the transparent image displayed by the original.

Even if the image displayed by the above display is captured by a digital camera or a microscope and printed using the imaged data obtained by this, for the same reason as above, the transparent image displayed by the copy is does not match the transparent image displayed by the original.

As described above, the transparent image displayed by the above-mentioned display does not match the transparent image displayed by the copy. Differences in these images are identifiable by viewing them with the naked eye or by viewing them under low power magnification. That is, if the above-mentioned display is an original, the original and its copy can be distinguished with the naked eye or by observation under low magnification.

Here, "observation magnified at a low magnification" means observation magnified at a magnification of 5 to 30 times. That is, being able to distinguish between the original and the copy by observing them under low magnification means that they can be distinguished by observing them with a simple magnifying glass such as a magnifying glass.

It is preferable that the distance between the first non-colored portions is in the range of 5 μm or more and 20 μm or less. Moreover, it is preferable that the distance between the second non-colored portions is in the range of 5 μm or more and 20 μm or less.

The distance between the first non-colored portions and the distance between the second non-colored portions may be equal or different. The first non-colored portions may be arranged regularly or may be arranged irregularly. Similarly, the second non-colored portions may be arranged regularly or irregularly.

According to another aspect of the present invention, the distance between the first colored portions adjacent in the arrangement direction is in the range of 5 μm or more and 50 μm or less, and the distance between the second colored portions adjacent in the arrangement direction. is in the range of 5 μm or more and 50 μm or less.

It is preferable that the distance between the first colored portions is in the range of 5 μm or more and 20 μm or less. Moreover, it is preferable that the distance between the second colored portions is in the range of 5 μm or more and 20 μm or less.

It can be easily confirmed by observation with the naked eye that the transmission image displayed by the display body adopting this configuration is different from the transmission image displayed by the duplicate.

According to still another aspect of the present invention, there is provided a display body according to any of the above aspects in which the second colored portion and the second uncolored portion face the first uncolored portion and the first colored portion, respectively. be done.

When this configuration is adopted, in a transmissive image obtained when the surface on the first main surface side of the display body, that is, the front surface is imaged from a vertical direction, at least one of the second colored portions is located at the position of the first non-colored portion. part can be seen. Further, in a transmissive image obtained when the surface on the second main surface side of the display body, that is, the back surface is imaged from a vertical direction, at least part of the first colored portion can be seen at the position of the second non-colored portion. Therefore, when the front surface or the back surface of the display is imaged from a vertical direction, the above effects can be obtained more reliably.

According to still another aspect of the present invention, the distance between a pair of the first colored portions adjacent in the arrangement direction with one of the first uncolored portions interposed therebetween is equal to the first uncolored portion One of the second non-colored portions is smaller than the distance between the pair of second non-colored portions that are adjacent in the arrangement direction with the second colored portions facing each other therebetween. The distance between the pair of the second colored portions adjacent in the arrangement direction is the pair of the second colored portions adjacent in the arrangement direction with the first colored portion facing the second non-colored portion interposed therebetween. A display according to the above aspect is provided which is smaller compared to the distance between one non-colored portions.

When this configuration is adopted, the above effects can be obtained more reliably when the front or rear surface of the display is imaged from a vertical direction. Moreover, when this configuration is adopted, the above effects can be easily obtained even when the front surface or the rear surface of the display is imaged from an oblique direction.

According to still another aspect of the present invention, the first colored portion and the first non-colored portion each have a linear shape, are arranged alternately in the width direction, and the second colored portion and the second non-colored portion The colored portions each have a linear shape and are arranged alternately in the width direction to provide a display related to any one of the side surfaces.

In this display, each of the first colored portion, the first non-colored portion, the second colored portion, and the second non-colored portion may have a linear shape. Alternatively, each of the first colored portion, the first uncolored portion, the second colored portion, and the second uncolored portion may include a curved portion. Alternatively, the first colored portions may form a nested array pattern, and the second colored portions may form a nested array pattern corresponding to the first colored portions.

In these cases, the line width of each of the first and second colored portions, that is, the distance between the adjacent first non-colored portions and the distance between the adjacent second non-colored portions are each equal to the length of the line It may be constant along the direction or may vary. In addition, adjacent first colored portions may have the same line width or may have different line widths.

The distance between the first colored portions, that is, the width of the first non-colored portions may be constant along the length of the line, or may vary. The distance between the first colored portions may be equal or different in the arrangement direction of the first and second colored portions.

Similarly, the distance between the second colored portions, ie, the width of the second uncolored portions, may be constant along the length of the line or may vary. The distance between the second colored portions may be equal or different in the arrangement direction of the first and second colored portions.

Alternatively, according to still another aspect of the present invention, the first colored portion and the first uncolored portion are arranged in a checkered pattern, and the second colored portion and the second uncolored portion are arranged in a checkered pattern. A display according to any of the above aspects is provided.

The light-transmissive base material has visible light transmittance. The light-transmitting substrate is preferably a colorless transparent or colorless translucent thin layer. For example, a light-transmissive substrate transmits incident light without coloration when illuminated with white light.

The light-transmissive substrate can be a polymer film or sheet, paper, or a combination thereof.

Polymer films or sheets include light transmissive materials such as polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), and triacetylcellulose (TAC). Films or sheets of high resin are preferred. As the light-transmissive base material, a suitable one is selected according to the use of the display.

When the light-transmitting substrate is a polymer film, the total light transmittance is preferably 87% or more and 93% or less. There is no upper limit for the total light transmittance, but considering the refractive index of the polymer film, it is difficult to obtain a polymer film with a total light transmittance higher than 93% in terms of manufacturing. Here, the "total light transmittance" is a value obtained by the method defined in JIS K7375:2008 "Plastics - Determination of total light transmittance and total light reflectance".

When the light-transmitting substrate is a polymer film, the haze is preferably 4% or less. There is no lower limit for haze, but it is usually 0.1% or more. Here, "haze" is a value obtained by the method specified in JIS K7136:2000 "Plastics - Determination of haze of transparent materials".

The paper is preferably watermark paper. However, in Japan, the watermark paper manufactured by private companies is limited to those that display a two-tone transparent image called the white watermark method. In Japan, watermark paper using a black watermark method for displaying transparent images of three or more gradations is used only for banknotes. When watermark paper manufactured by a private company is used as the light-transmissive substrate, it is desirable that the paper be thin. If a thin paper is used for the light transmissive substrate, it is preferred that the paper is selected so that it does not have insufficient strength or poor printability due to irregularities. Alternatively, a composite of paper and polymer film or sheet may be used as the light-transmitting substrate.

When the light-transmitting substrate contains paper, the opacity of the light-transmitting substrate is preferably 60% or less. Here, "opacity" is a value obtained by the method specified in JIS P8149:2000 "Paper and paperboard-Opacity test method (paper backing)-Diffuse lighting method".

The first colored layer is provided on the first main surface of the light transmissive substrate. As described above, the first colored layer includes first colored portions and first non-colored portions alternately arranged on the first main surface. The first colored portion transmits the first colored light when illuminated with white light. When illuminated with white light, the first non-colored portion transmits the white light without coloring it. According to one example, the first non-colored portions are spaces sandwiched between the first colored portions. According to another example, the first non-colored portions are made of a colorless transparent material that fills the gaps between the first colored portions.

The second colored layer is provided on the second main surface of the light transmissive substrate. As described above, the second colored layer includes first colored portions and first non-colored portions alternately arranged on the second main surface. The first colored portion transmits the first colored light when illuminated with white light. When illuminated with white light, the first non-colored portion transmits the white light without coloring it. According to one example, the first non-colored portions are spaces sandwiched between the first colored portions. According to another example, the first non-colored portions are made of a colorless transparent material that fills the gaps between the first colored portions.

The thickness of the first and second colored portions is preferably 0.3 μm or more. If the first and second colored parts are thinned, there is a possibility that their adhesion to the light-transmissive substrate will be insufficient.

The first and second colored portions can be formed by printing. For example, first, one of the first and second colored portions is formed by printing on one main surface of the light transmissive substrate. Next, alignment is appropriately performed, and the other of the first and second colored portions is formed by printing on the other main surface of the light transmissive substrate. The printing method is selected from known printing methods such as screen printing, screen offset printing, gravure printing, gravure offset printing, flexographic printing, and reverse printing, depending on the dimensions and gaps of the first and second colored portions to be formed. Select.

Each of the first and second colored portions can include a colored pigment and a polymer.
As color pigments, organic pigments, inorganic pigments, or combinations thereof known in the art can be used.

Inorganic pigments include metals; oxides typified by titanium dioxide, zinc white, and iron black; hydroxides; sulfides; selenides; ferrocyanides; phosphate; and carbon. Organic pigments include carbon compounds, nitroso-based compounds; nitro-based compounds; azo-based compounds; lake-based pigments, phthalocyanine-based compounds, condensed polycyclic materials, and the like.

Polymers consist of colorless and transparent resins or colored resins. Examples of resins include polycarbonate resins, acrylic resins, fluorine acrylic resins, silicone acrylic resins, epoxy acrylate resins, polystyrene resins, acrylonitrile-styrene resins, cycloolefin polymers, methylstyrene resins, fluorene resins, polyethylene terephthalate (PET ), polypropylene, phenolic resin, melamine resin, polyethylene naphthalate (PEN), and polyimide (PI).

Thermoplastic resins include polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), cyclic olefin copolymer (COC), acrylic resins such as polymethyl methacrylate (PMMA), cycloolefin polymer (COP), methacrylic acid • Styrene copolymer (MS), acrylonitrile-styrene copolymer (AS), polyethylene naphthalate (PEN), and polyimide (PI) can be used. As thermosetting resins, thermosetting resins well known in the art such as phenolic resins, melamine resins, epoxy resins, and alkyds can be used.

Besides these, engineering plastics and super engineering plastics such as polybutylene terephthalate (PBT), polyoxymethyl (POM), polyamide (PA), and polyphenylsulfide (PPS) can also be used as resins. . In addition, it is possible to use resins that are cured by ionizing radiation, such as acrylic resins, urethane resins, epoxy resins, polyester resins, and thiol resins.

Each of the first and second colored portions can further include light scattering particles. Spherical particles or irregularly shaped particles are used as the light scattering particles. The material of the light scattering particles may be either organic or inorganic.

Organic substances that can be used for the light scattering particles include, for example, acrylic resins, polystyrene, styrene-acrylic copolymers or crosslinked products thereof, melamine-formalin condensates, urethane resins, polyesters, silicone resins, fluorine particles, epoxy resins, and these. is a copolymer of Inorganic materials that can be used for light scattering particles include, for example, clay compounds such as smectite, kaolinite, and talc; inorganic oxides such as silica, titania, alumina, silica-alumina, zirconia, zinc oxide, barium oxide, and strontium oxide; inorganic carbonates such as calcium carbonate, barium carbonate, magnesium carbonate, and strontium carbonate; inorganic chlorides such as barium chloride and strontium chloride; inorganic sulfates such as barium sulfate and strontium sulfate; inorganic nitrates such as barium nitrate and strontium nitrate; inorganic hydroxides such as barium hydroxide, aluminum hydroxide, and strontium hydroxide; and glass.

The ink used to form the first and second colored portions may further contain a solvent in addition to the above components. Solvents are, for example, dodecane or tetradecane. Other compounds or compositions may be used as solvents. For example, in quick-drying inks, solvents such as methyl ethyl ketone (MEK), ethanol, and acetone, which have a low boiling point and are volatilized at room temperature, can be used as solvents. Water-based inks can use water (purified water) as a solvent. Oil-based inks can use oils that are difficult to volatilize at room temperature, such as aliphatic hydrocarbons, glycol ethers, and higher alcohols, as solvents.

BRIEF DESCRIPTION OF THE DRAWINGS The top view which shows roughly the display body which concerns on one Embodiment of this invention. Sectional drawing which expands and shows a part of display body shown in FIG. The top view which expands and shows a part of front surface of the display body shown in FIG. The top view which expands and shows a part of front surface shown in FIG. The top view which expands and shows a part of back surface of the display body shown in FIG. The top view which expands and shows a part of back surface shown in FIG. FIG. 2 is a diagram schematically showing how an image displayed by the display shown in FIG. 1 is captured; FIG. 8 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 7; FIG. 2 is a plan view showing an enlarged part of the copy; FIG. 2 is a diagram schematically showing an example of observing a reflected image displayed by the display shown in FIG. 1; FIG. 11 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 10; FIG. 4 is a diagram schematically showing another example of observing a reflected image displayed by the display shown in FIG. 1; FIG. 13 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 12; FIG. 5 is a diagram schematically showing still another example of observing a reflected image displayed by the display shown in FIG. 1; FIG. 2 is a diagram schematically showing an example of observing a transmitted image displayed by the display shown in FIG. 1; FIG. 16 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 15; A plan view schematically showing an example of a structure that can be employed for the first colored layer of the display body according to the first modified example. A plan view schematically showing an example of a structure that can be employed for the second colored layer of the display body according to the first modified example. A plan view schematically showing an example of a structure that can be employed for the first colored layer of the display body according to the second modified example. A plan view schematically showing an example of a structure that can be employed for the second colored layer of the display body according to the second modified example.

Embodiments of the present invention will be described below with reference to the drawings. Embodiments described below are more specific to any of the above aspects. Elements having the same or similar functions are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a plan view schematically showing a display according to one embodiment of the invention. FIG. 2 is a cross-sectional view showing an enlarged part of the display body shown in FIG. 3 is a plan view showing an enlarged part of the front surface of the display shown in FIG. 1. FIG. 4 is a plan view showing an enlarged part of the front surface shown in FIG. 3. FIG. 5 is a plan view showing an enlarged part of the back surface of the display shown in FIG. 1. FIG. 6 is a plan view showing an enlarged part of the rear surface shown in FIG. 5. FIG. In each figure, the X direction and the Y direction are directions parallel to the display surface of the display 1 and perpendicular to each other, and the Z direction is a direction perpendicular to the X direction and the Y direction, that is, the display. It is the thickness direction of the body 1 .

The display 1 shown in FIGS. 1 to 5 is a gift certificate. The display 1 may be securities other than gift certificates. Alternatively, the display 1 may be a certificate or identification card, such as an identification card.

The display 1 includes a light transmissive substrate 11, first colored layer 12 and second colored layer 13 shown in FIG. 2, and a printed layer 14 shown in FIG.

The light-transmissive base material 11 is a colorless transparent or colorless translucent thin layer having visible light transmittance. Here, as an example, the light transmissive base material 11 is assumed to be a colorless and transparent polymer film.

The light transmissive substrate 11 has a rectangular shape with long sides parallel to the X direction. The light transmissive substrate 11 may have other shapes.

The light-transmitting base material 11 has a first principal surface and a second principal surface which is the back surface thereof. The first main surface and the second main surface are the upper surface and the lower surface of the light transmissive substrate 11 in FIG. 2, respectively. Hereinafter, the surface on the side of the first principal surface and the surface on the side of the second principal surface of the display body 1 are referred to as the front surface and the rear surface, respectively.

The printed layer 14 is provided on the first main surface of the light transmissive substrate 11 . The print layer 14 displays, for example, characters, patterns, graphics, photographs, or a combination thereof.

The printed layer 14 can be further provided on the second main surface of the light transmissive substrate 11 . Alternatively, the printed layer 14 can be provided on the second main surface of the light transmissive substrate 11 instead of on the first main surface. Alternatively, the print layer 14 can be omitted.

The print layer 14 has a window W, which is an opening, as shown in FIG. A portion corresponding to the window W of the display 1 is an authenticity determination section used for authenticity determination of the display 1 .

The first main surface has, at the position of the window W, a first print area R1A and a first non-print area R1B shown in FIGS. On the other hand, the second main surface has a second print area R2A and a second non-print area R2B shown in FIGS. 2 and 5 at the window W position.

Here, the first print area R1A is a pattern corresponding to the character string "COPY", and the first non-print area R1B is its reverse pattern. Also, here, the second print area R2A is a pattern corresponding to the mirror image of the character string "COPY", and the second non-print area R2B is an inverted pattern thereof.

The first colored layer 12 is provided at the position of the window W on the first main surface of the light transmissive substrate 11 . The first colored layer 12 is not provided on the first non-printing region R1B shown in FIGS. 2 and 3, but is provided on the first printing region R1A.

As shown in FIGS. 2 and 4, the first colored layer 12 includes first colored portions 121 and first non-colored portions 122 alternately arranged on the first main surface. The first colored portions 121 and the first uncolored portions 122 each have a linear shape and are alternately arranged in the width direction. Here, the first colored portions 121 and the first uncolored portions 122 each have a shape extending in the X direction and are alternately arranged in the Y direction.

The first colored portion 121 transmits the first colored light when illuminated with white light. The first colored portion 121 is made of ink containing a color pigment and a polymer.

The dimension of the first colored portion 121 in the arrangement direction of the first colored portion 121 and the first uncolored portion 122, that is, the width W1a of the first colored portion 121 is constant along the length direction of the first colored portion 121. be. Adjacent first colored portions 121 have the same width W1a.

The width W1a corresponds to the distance between the first uncolored portions 122 adjacent to each other in the arrangement direction of the first colored portions 121 and the first uncolored portions 122 . The width W1a is in the range of 5 μm or more and 20 μm or less.

When illuminated with white light, the first non-colored portion 122 transmits the white light without coloring it. Here, the first non-colored portion 122 is the space between adjacent first colored portions 121 .

The dimension of the first uncolored portion 122 in the direction in which the first colored portion 121 and the first uncolored portion 122 are arranged, that is, the width W1b of the first uncolored portion 122 is set along the length direction of the first uncolored portion 122. is constant. Adjacent first non-colored portions 122 have the same width W1b.

The width W1b corresponds to the distance between the first colored portions 121 adjacent to each other in the arrangement direction of the first colored portions 121 and the first uncolored portions 122 . The width W1b is in the range of 5 μm or more and 50 μm or less. Here, the width W1b is smaller compared to the width W1a. The sum of the width W1a and the width W1b is the pitch P1 of the arrangement of the first colored portions 121 or the first non-colored portions 122 .

The second colored layer 13 is provided at the position of the window W on the second main surface of the light transmissive base material 11 . The second colored layer 13 is not provided on the second non-printing region R2B shown in FIGS. 2 and 5, but is provided on the second printing region R2A.

The second colored layer 13 includes, as shown in FIGS. 2 and 6, second colored portions 131 and second non-colored portions 132 alternately arranged on the second main surface. The second colored portions 131 and the second uncolored portions 132 are alternately arranged on the second main surface corresponding to the first colored portions and the first uncolored portions. The second colored portions 131 and the second uncolored portions 132 each have a linear shape and are alternately arranged in the width direction. Here, the second colored portions 131 and the second uncolored portions 132 each have a shape extending in the X direction and are alternately arranged in the Y direction.

The second colored portion 131 transmits a second colored light having a color different from that of the first colored light when illuminated with white light. The second colored portion 131 is made of ink containing a coloring pigment and a polymer.

The dimension of the second colored portion 131 in the arrangement direction of the second colored portion 131 and the second uncolored portion 132, that is, the width W2a of the second colored portion 131 is constant along the length direction of the second colored portion 131. be. In addition, adjacent second colored portions 131 have the same width W2a.

The width W2a corresponds to the distance between the second uncolored portions 132 adjacent to each other in the arrangement direction of the second colored portions 131 and the second uncolored portions 132 . The width W2a is in the range of 5 μm or more and 20 μm or less. Here, width W2a is equal to width W1a.

When illuminated with white light, the second non-colored portion 132 transmits the white light without coloring it. Here, the second non-colored portion 132 is the space between the adjacent second colored portions 131 .

The dimension of the second uncolored portion 132 in the arrangement direction of the second colored portion 131 and the second uncolored portion 132, that is, the width W2b of the second uncolored portion 132 is set along the length direction of the second uncolored portion 132. is constant. Adjacent second non-colored portions 132 have the same width W2b.

The width W2b corresponds to the distance between the second colored portions 131 adjacent to each other in the arrangement direction of the second colored portions 131 and the second uncolored portions 132 . The width W2b is in the range of 5 μm or more and 50 μm or less. Here, width W2b is smaller compared to width W2a. Also, here, the width W2b is equal to the width W1b. The sum of the width W2a and the width W2b is the pitch P2 of the arrangement of the second colored portions 131 or the second non-colored portions 132 .

As shown in FIG. 2 , the second colored portion 131 faces the first non-colored portion 122 . Also, the first colored portion 121 faces the second non-colored portion 132 . In orthogonal projection onto a plane parallel to the first main surface, the centerline of each second colored portion 131 coincides with the centerline of the first uncolored portion 122 facing the second colored portion 131. there is Also, in this orthogonal projection, the center line of each first colored portion 121 coincides with the center line of the second non-colored portion 132 facing the first colored portion 121 .

This display 1 is distinguishable from its copy by observation under low magnification. This will be explained below.

FIG. 7 is a diagram schematically showing how an image displayed by the display shown in FIG. 1 is picked up. FIG. 8 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. FIG. 9 is a plan view showing an enlarged part of the copy.

In FIG. 7, the display 1 is installed so that its rear surface faces the diffuse reflector REF, and the light source LS is installed so that the front surface is illuminated with the illumination light IL from an oblique direction. An imaging device CM is installed so as to capture an image of the emitted reflected light RL. Note that the illumination light IL is white light.

Under this condition, both the first colored layer 12 and the second colored layer 13 contribute to display. Also, the width W1a of the first colored portion 121, the width W1b of the first uncolored portion 122, the width W2a of the second colored portion 131, and the width W2b of the second uncolored portion 132 are narrow. Therefore, when the resolution of the imaging device CM is low, the imaging device CM corresponds to the character string "COPY", as shown in FIG. Read an image I1 containing a pattern entirely having colors caused by .

On the other hand, when the resolution of the imaging device CM is high, the imaging device CM has a first linear portion in which the first colored portion and the second non-colored portion overlap, and a first linear portion in which the first colored portion and the second colored portion overlap. The second linear portion, the third linear portion where the first non-colored portion and the second colored portion overlap, and the fourth linear portion where the first colored portion and the second colored portion overlap Reads images that are repeatedly arranged in the width direction in order.

When print data is generated from the data of the image thus read and printing is performed based on this print data, the copy 2 shown in FIG. 9 is obtained. This copy 2 includes a light transmissive substrate 21 and colored layers 22 and 23 formed thereon. Each of the colored layers 22 and 23 forms a pattern corresponding to the character string "COPY". The colored layers 22 and 23 are respectively composed of dot-shaped portions 221 and 231 having different colors.

When the resolution of the imaging device CM is low, the resolution of the print data is also low. Therefore, the printer uniformly arranges the dot-shaped portions 221 and uniformly arranges the dot-shaped portions 231 in the area corresponding to the character string "COPY" on one main surface of the light transmissive substrate 21. do.

Even if the imaging device CM has a high resolution, the width of the first to fourth linear portions is less than the resolution of a general printer. Based on the low print data, the dot-shaped portions 221 are uniformly arranged within the region corresponding to the character string "COPY" on one main surface of the light-transmissive substrate 21, and the dot-shaped portions 231 are uniformly arranged. Deploy.

Therefore, when this copy 2 is magnified at a low magnification using a magnifying glass such as a magnifying glass, the dot-shaped portions 221 and 231 are uniformly arranged in the above region as shown in FIG. You can check the structure.

When the display 1 is magnified at a low magnification using a magnifying glass such as a magnifying glass, in the region where the first colored layer 12 and the second colored layer 13 are provided, the first colored portion 121 and the second colored portion A striped pattern corresponding to the arrangement of 131 can be visually recognized. On the other hand, the arrangement of the dot-shaped portions 221 does not form a stripe-shaped pattern, and the arrangement of the dot-shaped portions 231 does not form a stripe-shaped pattern. Therefore, it can be confirmed that the copy 2 is different from the display 1 as the original due to these differences.

This display 1 is distinguishable from its copy even by observation with the naked eye. This will be explained below.

FIG. 10 is a diagram schematically showing an example of how a reflection image displayed by the display shown in FIG. 1 is being observed. 11 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 10. FIG.

In FIG. 10, the light source LS and the display 1 are arranged so that the illumination light IL from the light source LS illuminates the front surface of the display 1 from an oblique direction, and the observer OB observes the reflected light RL emitted from the display 1. are placed. Note that the illumination light IL is white light. Moreover, no reflective layer is provided on the back side of the display 1 .

Under this condition, the contribution of the second colored layer 13 to the display is small compared to the contribution of the first colored layer 12 to the display. That is, the contribution of the first colored light to the display is greater than the contribution of the second colored light to the display. Therefore, the color of the region corresponding to the character string "COPY" in the image I2 viewed by the observer OB under this condition is closer to the color of the first colored light than the color of the second colored light.

On the other hand, when copy 2 is observed with the naked eye under the conditions of FIG. The contribution of the dot-shaped portion 221 and the contribution of the dot-shaped portion 231 to this display color are substantially equal. Therefore, the image displayed by the copy 2 under the conditions of FIG. 10 differs from the image I2 displayed by the display 1 under the conditions of FIG. 10 in the color of the area corresponding to the character string "COPY".

Therefore, by confirming such a color difference, the display 1 and the copy 2 can be distinguished from each other.

FIG. 12 is a diagram schematically showing another example of observing a reflected image displayed by the display shown in FIG. 13 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 12. FIG.

In FIG. 12, the light source LS and the display 1 are arranged so that the illumination light IL from the light source LS illuminates the back surface of the display 1 from an oblique direction, and the observer OB observes the reflected light RL emitted from the display 1. are placed. Note that the illumination light IL is white light. Moreover, no reflective layer is provided on the front side of the display 1 .

Under this condition, the contribution of the first colored layer 12 to the display is small compared to the contribution of the second colored layer 13 to the display. That is, the contribution of the second colored light to the display is greater than the contribution of the first colored light to the display. Therefore, the color of the region corresponding to the mirror image of the character string "COPY" in the image I3 viewed by the observer OB under this condition is closer to the color of the second colored light than the color of the first colored light.

On the other hand, when copy 2 is observed with the naked eye under the conditions of FIG. The contribution of the dot-shaped portion 221 and the contribution of the dot-shaped portion 231 to this display color are substantially equal. Therefore, the image displayed by the copy 2 under the conditions of FIG. 12 differs from the image I2 displayed by the display 1 under the conditions of FIG. 10 in the color of the area corresponding to the mirror image of the character string "COPY".

Therefore, by confirming such a color difference, the display 1 and the copy 2 can be distinguished from each other.

10, the color displayed in the area corresponding to the character string "COPY" under the conditions shown in FIG. different colors to be used. Such a change in display color due to a change in viewing conditions cannot be reproduced on the copy 2 . Therefore, the display 1 and the copy 2 can be distinguished from each other also by confirming the presence or absence of a change in display color accompanying the change in viewing conditions.

FIG. 14 is a diagram schematically showing still another example of observing a reflected image displayed by the display shown in FIG.

In FIG. 14, the light source LS and the display 1 are arranged so that the illumination light IL from the light source LS illuminates the front surface of the display 1 from an oblique direction, and the observer OB observes the reflected light RL emitted from the display 1. are placed. Note that the illumination light IL is white light. A diffuse reflector REF is installed on the back side of the display 1 .

If the illumination direction and the viewing direction are changed under these viewing conditions, the balance between the magnitude of the contribution of the first colored layer 12 to the display and the magnitude of the contribution of the second colored layer 13 to the display changes. As a result, the display 1 changes the color displayed in the area corresponding to the character string "COPY". Copy 2 does not produce such a color change. Therefore, it is possible to distinguish the display 1 and the copy 2 from each other by confirming whether or not there is a change in the display color due to a change in the illumination direction or the observation direction.

FIG. 15 is a diagram schematically showing an example of how a transmission image displayed by the display shown in FIG. 1 is being observed. 16 is a diagram showing an image displayed by the display shown in FIG. 1 under the conditions of FIG. 15. FIG.

In FIG. 15, the light source LS and the display 1 are arranged so that the illumination light IL from the light source LS illuminates the back surface of the display 1, and the transmitted light TL emitted from the display 1 is observed by the observer OB. there is Note that the illumination light IL is white light.

In the image I4 displayed by the display 1 under this observation condition, the color of the region corresponding to the character string "COPY" is the color produced by the subtractive color mixing of the color of the first colored portion 121 and the color of the second colored portion 131. is. Under this viewing condition, the contribution of the first colored layer 12 to the display and the contribution of the second colored layer 13 to the display are substantially equal.

In the image displayed by the copy 2 under this observation condition, the color of the area corresponding to the character string "COPY" is the color produced by subtractive color mixture of the color of the dot-shaped portion 221 and the color of the dot-shaped portion 231 . Also, under this observation condition, the magnitude of the contribution of the colored layer 22 to the display is substantially equal to the magnitude of the contribution of the colored layer 23 to the display.

However, as is clear from the description given with reference to FIG. 14, in the image read by the imaging device CM under the conditions of FIG. 7, the color of the area corresponding to the character string "COPY" is affected by the lighting direction. . In the image read by the imaging device CM, the color of the area corresponding to the character string "COPY" matches the color of the area corresponding to the character string "COPY" in the image I4 displayed by the display 1 under the conditions of FIG. not necessarily.

Therefore, the display 1 and the copy 2 can be distinguished from each other also by confirming the color of the area corresponding to the character string "COPY" in the transparent image.

In addition, the brightness of the area corresponding to the character string "COPY" in the image displayed by the display 1 under the conditions of FIG. 15 can change when the display 1 is tilted around an axis parallel to the X direction. On the other hand, the area corresponding to the character string "COPY" in the image displayed on the copy 2 under the conditions of FIG. Brightness does not change. Therefore, the display 1 and the copy 2 can be distinguished from each other also by confirming this change in brightness.

Various modifications of the display 1 are possible.
For example, in the display member 1 described above, each of the first colored portion 121, the first uncolored portion 122, the second colored portion 131, and the second uncolored portion 132 has a linear shape, but they have a curved shape. may include a portion having For example, each of the first colored portion 121, the first uncolored portion 122, the second colored portion 131, and the second uncolored portion 132 may have a waveform such as a sinusoidal shape. Alternatively, the first colored portion 121, the first uncolored portion 122, the second colored portion 131, and the second uncolored portion 132 may have the following shapes.

FIG. 17 is a plan view schematically showing an example of a structure that can be adopted for the first colored layer of the display body according to the first modified example. FIG. 18 is a plan view schematically showing an example of a structure that can be adopted for the second colored layer of the display body according to the first modified example.

In FIG. 17, the first colored portions 121 form a nested arrangement pattern. Specifically, the first colored portion 121 forms a concentric pattern.

In FIG. 18 , the second colored portions 131 form a nested arrangement pattern corresponding to the first colored portions 121 . Specifically, the second colored portion 131 forms a concentric pattern such that the second colored portion 131 and the second uncolored portion 132 face the first uncolored portion 122 and the first colored portion 121, respectively. ing.

A display body similar to the display body 1 described above, except for adopting such a configuration, also exhibits the above-described effects.

In the display body 1 described above, the first colored portions 121 and the first uncolored portions 122 each have a linear shape and are arranged alternately in the width direction, and the second colored portions 131 and the second uncolored portions 132 , each having a linear shape and arranged alternately in the width direction. The first colored portion 121, the first uncolored portion 122, the second colored portion 131, and the second uncolored portion 132 may not have a linear shape.

FIG. 19 is a plan view schematically showing an example of a structure that can be adopted for the first colored layer of the display body according to the second modified example. FIG. 20 is a plan view schematically showing an example of a structure that can be adopted for the second colored layer of the display body according to the second modified example.

In FIG. 19, the first colored portions 121 and the first non-colored portions 122 are arranged in a checkered pattern. In FIG. 20, the second colored portions 131 and the second non-colored portions 132 are arranged in a checkered pattern. The second colored portion 131 and the second uncolored portion 132 face the first uncolored portion 122 and the first colored portion 121, respectively.

A display body similar to the display body 1 described above, except for adopting such a configuration, also exhibits the above-described effects.

Specific examples of the present invention are described below.

<Manufacturing of Display>
(Example 1)
The display 1 described with reference to FIGS. 1 to 6 was manufactured by the following method. Note that the printed layer 14 is omitted.

First, a polyethylene terephthalate film was prepared as the light transmissive substrate 11 .
Next, a first colored layer 12 was formed on one main surface of the light transmissive substrate 11 by gravure offset printing using cyan process ink. In this gravure offset printing, a commercially available cyan process ink was used, a metal doctor blade was used, and a blanket mainly composed of silicone rubber was used. As the intaglio, a copper layer plated with chromium was used. Each of the width W1a of the first colored portion 121 and the width W1b of the first non-colored portion 122 was set to 10 μm.

After that, the second colored layer 13 was formed on the other main surface of the light-transmissive substrate 11 by gravure offset printing using a magenta process ink. In this gravure offset printing, a commercially available magenta process ink was used, a metal doctor blade was used, and a blanket mainly composed of silicon rubber was used. As the intaglio, a copper layer plated with chromium was used. Each of the width W2a of the second colored portion 131 and the width W2b of the second non-colored portion 132 was set to 10 μm. In the second colored layer 13, the center line of the second colored portion 131 and the center line of the second uncolored portion 132 respectively correspond to the center of the first uncolored portion 122 in orthogonal projection onto a plane parallel to the main surface. It was formed so as to match the line and the center line of the first colored portion 121 .

(Example 2)
Display 1 was manufactured in the same manner as in Example 1, except for the following items. That is, in this example, the width W1a of the first colored portion 121 and the width W1b of the first non-colored portion 122 were set to 10 μm and 50 μm, respectively. The width W2a of the second colored portion 131 and the width W2b of the second non-colored portion 132 were set to 10 μm and 50 μm, respectively.

(Comparative example 1)
Display 1 was manufactured in the same manner as in Example 1, except for the following items. That is, in this example, the width W1a of the first colored portion 121 and the width W1b of the first non-colored portion 122 were set to 100 μm and 10 μm, respectively. The width W2a of the second colored portion 131 and the width W2b of the second non-colored portion 132 were set to 100 μm and 10 μm, respectively.

(Comparative example 2)
Display 1 was manufactured in the same manner as in Example 1, except for the following items. That is, in this example, each of the width W1a of the first colored portion 121 and the width W1b of the first non-colored portion 122 was set to 100 μm. Each of the width W2a of the second colored portion 131 and the width W2b of the second non-colored portion 132 was set to 100 μm.

The dimensions adopted in the display bodies 1 according to Examples 1 and 2 and Comparative Examples 1 and 2 are shown in the table below.

<Manufacturing Copies>
Each of the displays 1 according to Examples 1 and 2 and Comparative Examples 1 and 2 was illuminated with white light, and images displayed by the displays were captured using a microscope. A copy was produced by printing on a polyethylene terephthalate film using the data of the image thus read. An ink jet color printer was used for this printing.

<Evaluation 1>
For each of the displays 1 according to Examples 1 and 2 and Comparative Examples 1 and 2 and copies thereof, transmission images displayed when illuminated with white light were observed using a magnifying glass. The magnifying power of the magnifying glass was 10 times. The results are shown in the table above.

Here, when the transmission image displayed by the original and the transmission image displayed by the copy were observed with a magnifying glass, the evaluation was given as "A" when they could be distinguished from each other. Also, here, when the transmission image displayed by the original and the transmission image displayed by the copy were observed with a magnifying glass, the evaluation was given as "B" when they could not be distinguished from each other.

Regarding the display bodies 1 according to Examples 1 and 2 and Comparative Examples 1 and 2, it was possible to confirm a striped arrangement derived from the arrangement of the first colored portions 121 and the second colored portions 131 in the transmission images thereof. .

On the other hand, the copy of the display member 1 according to Example 1 had a structure in which the dot-shaped portions 221 and 231 described with reference to FIG. 9 were uniformly arranged. sequence could not be confirmed. Due to these differences, the display 1 according to Example 1 and its copy could be distinguished from each other.

In the copy of the display member 1 according to Example 2, the dot-shaped portions 221 and 231 described with reference to FIG. Dot-shaped portions were present. Also in the transmission image of this copy, it was possible to confirm dot-shaped portions protruding from the linear portions constituting the stripes. As a result, the display 1 according to Example 2 and its copy could be distinguished from each other.

In the copy of the display 1 according to Comparative Example 1, the dot-shaped portions 221 and 231 described with reference to FIG. No dots were present. Therefore, by checking the presence or absence of dot-shaped portions protruding from the linear portions forming the stripes in the transmission image of the copy, the display member 1 according to Comparative Example 1 and the copy thereof can be distinguished from each other. could not be distinguished from each other. In order to distinguish between them, it was necessary to analyze in detail the line width and line spacing of the linear portions forming the stripes in the transmission image.

Also in the copy of the display 1 according to Comparative Example 2, the dot-shaped portions 221 and 231 described with reference to FIG. No dots were present. Therefore, by checking the presence or absence of dot-shaped portions protruding from the linear portions forming the stripes in the transmission image of the copy, the display member 1 according to Comparative Example 2 and the copy thereof can be distinguished from each other. could not be distinguished from each other. In order to distinguish between them, it was necessary to analyze in detail the line width and line spacing of the linear portions forming the stripes in the transmission image.

<Evaluation 2>
For each of the displays 1 according to Examples 1 and 2 and Comparative Examples 1 and 2 and copies thereof, the transmitted images displayed when illuminated with white light were observed with the naked eye. The results are shown in the table above.

When the transmission image displayed by the original and the transmission image displayed by the copy were observed with the naked eye, the evaluation was given as "A" when they could be distinguished from each other. Also, here, when the transparent image displayed on the original and the transparent image displayed on the copy could not be distinguished from each other when observed with the naked eye, the evaluation was given as "B".

The transparent image displayed by the display 1 according to Example 1 and the transparent image displayed by its copy were different in color. Due to this color difference, the display 1 according to Example 1 and its copy could be distinguished from each other.

Further, the color of the transparent image displayed by the display 1 according to Example 2 and the transparent image displayed by the copy thereof were different. Due to this color difference, the display 1 according to Example 2 and its copy could be distinguished from each other.

On the other hand, no difference in color could be perceived between the transparent image displayed by the display 1 according to Comparative Example 1 and the transparent image displayed by the copy thereof. Therefore, it was not possible to distinguish the display 1 according to Comparative Example 1 and its copy from each other by using the difference in color.

Also, no difference in color could be perceived between the transparent image displayed by the display 1 according to Comparative Example 2 and the transparent image displayed by the copy thereof. Therefore, the display 1 according to Comparative Example 2 and its copy could not be distinguished from each other by using the difference in color.

DESCRIPTION OF SYMBOLS 1... Display body, 2... Copy, 11... Light-transmissive base material, 12... First colored layer, 13... Second colored layer, 14... Printed layer, 21... Light-transmissive base material, 22... Colored layer, 23... colored layer, 121... first colored portion, 122... first uncolored portion, 131... second colored portion, 132... second uncolored portion, 221... dot-shaped portion, 231... dot-shaped portion, CM... imaging Apparatus, I1... Image, I2... Image, I3... Image, I4... Image, IL... Illumination light, LS... Light source, OB... Observer, P1... Pitch, P2... Pitch, R1A... First printing area, R1B... Third 1 non-printing area, R2A... second printing area, R2B... second non-printing area, REF... diffuse reflector, RL... reflected light, TL... transmitted light, W... window, W1a... width, W1b... width, W2a... Width, W2b . . . Width.

Claims (9)

a light transmissive substrate having a first main surface and a second main surface which is the back surface thereof;
A first colored portion and a first non-colored portion are alternately arranged on the first main surface, and the first colored portion transmits the first colored light when illuminated with white light, and the first non-colored portion transmits the first colored light. When illuminated with white light, the colored section transmits the white light without coloring it, and the distance between the first non-colored sections adjacent in the arrangement direction of the first colored section and the first non-colored section is a first colored layer within a range of 5 μm or more and 20 μm or less;
A second colored portion and a second uncolored portion alternately arranged on the second main surface corresponding to the first colored portion and the first uncolored portion, and the second colored portion is illuminated with white light. a second colored light having a color different from that of the first colored light is transmitted therethrough, and when the second uncolored portion is illuminated with white light, the white light is transmitted without being colored; and a second colored layer in which the distance between the adjacent second non-colored portions is in the range of 5 μm or more and 20 μm or less. The distance between the first colored portions adjacent in the arrangement direction is within the range of 5 μm or more and 50 μm or less, and the distance between the second colored portions adjacent in the arrangement direction is within the range of 5 μm or more and 50 μm or less. A display according to claim 1. 3. The display according to claim 1, wherein said second colored portion and said second non-colored portion face said first non-colored portion and said first colored portion, respectively. The distance between a pair of the first colored portions adjacent to each other in the arrangement direction with one of the first uncolored portions interposed therebetween is defined by the second colored portion facing the first uncolored portion. A pair of adjacent second non-colored portions in the arrangement direction with one of the second non-colored portions interposed therebetween is smaller than the distance between the pair of the second non-colored portions that are adjacent in the arrangement direction. The distance between the second colored portions is compared with the distance between a pair of the first uncolored portions adjacent in the arrangement direction with the first colored portion facing the second uncolored portion interposed therebetween. 4. A display according to claim 3, which is smaller than . The first colored portion and the first uncolored portion each have a linear shape and are arranged alternately in the width direction, and the second colored portion and the second uncolored portion each have a linear shape. 5. The display member according to claim 1, wherein the display member is arranged alternately in the width direction. 6. The display according to claim 5, wherein each of said first colored portion, said first uncolored portion, said second colored portion and said second uncolored portion has a linear shape. 6. The display according to claim 5, wherein each of said first colored portion, said first non-colored portion, said second colored portion and said second non-colored portion includes a curved portion. 6. The display according to claim 5, wherein the first colored portions form a nested array pattern, and the second colored portions form a nested array pattern corresponding to the first colored portions. The first colored portion and the first non-colored portion are arranged in a checkered pattern, and the second colored portion and the second non-colored portion are arranged in a checkered pattern. Display body of description.

Images