JP2016034698A - Glossy pattern forming body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming body having a glossy pattern where different regions in the glossy pattern become visible, respectively, at different wavelengths in an infrared region while hue of the glossy pattern is not restricted under a visible light source.SOLUTION: A glossy pattern forming body includes, in at least a part on a substrate, a glossy pattern consisting of a first image part having a first interference thin film and a second image part having a second interference thin film. The first interference thin film and the second interference thin film are made of the same material. Ratio of a product of thickness and refraction index of each interference thin film is 1:1.2 to 2.5. By difference in the ratio, wavelength of interference light in an infrared wavelength region of each image part is different. In two different infrared wavelength regions, one of the two interference thin films has the maximum reflectance index and the other has the minimum reflection index, thereby, either one of the image parts becomes visible by difference of the reflective index.SELECTED DRAWING: Figure 16

Description

  The present invention relates to a formed body having confidential information to be used for preventing counterfeiting and duplication of valuable printed matter such as banknotes, passports, securities, product tags, and various certificates.

  With the recent development of digital devices such as scanners, printers, and color copies, it has become possible to easily produce elaborate copies of precious printed matter. As one of the countermeasures, many methods have been tried in the past using glossy inks such as pearl inks and transparent inks whose colors change depending on the observation angle, which are impossible to reproduce with digital equipment. The glossy printed material enables simple true / false discrimination with the naked eye by changing the observation angle, but the effect does not occur in an environment having no light source such as a dark place. Thus, there is a need for a glossy printed material that can determine authenticity under observation conditions different from those of a visible light source.

  As a glossy printed matter that can be determined as authentic under an observation condition different from that under a visible light source, Patent Document 1 discloses a pearl print pattern including an image portion and a background portion formed around the image portion. And a pearl ink containing a color pigment having infrared reflection characteristics, and the background portion is the same pearl pigment as one region, and the red color in which the reflectance in the infrared region is different by about 30%. A printed matter formed of pearl ink containing a color pigment having external absorption characteristics is disclosed (for example, see Patent Document 1).

  The produced printed material is visible as a single pearl print pattern when tilted under a visible light source, but when viewed in the infrared region using an infrared viewer or infrared scanner, the infrared reflections of the image area and background area are reflected. Due to the difference in rate, the image portion or the background portion can be visually recognized. Therefore, authenticity determination can be performed by two observation methods due to the difference in infrared reflectance in the infrared region in addition to the visible light source.

JP 2004-188808 A

  According to Patent Document 1, it is possible to form a printed matter having a glossy pattern in which the image portion or the background portion can be visually recognized in the infrared region. However, in patent document 1, the coloring ink which has an infrared characteristic contained in pearl ink is made into black materials, such as carbon black and chromofine. Therefore, there is a problem that the obtained printed matter is limited to a dark color under a visible light source.

  Therefore, the present invention provides a formed body having a glossy pattern in which the color of the glossy pattern is not limited under a visible light source, and different regions in the glossy pattern can be visually recognized at different wavelengths in the infrared region. For the purpose.

  In order to achieve the above-mentioned object, the glossy pattern forming body of the present invention has a glossy pattern comprising a first image portion and a second image portion at least partially on the substrate, and the first image Part has the first interference thin film, the second image part has the second interference thin film, the first interference thin film and the second interference thin film are made of the same material, and each interference The ratio of the product of the thickness of the thin film and the refractive index is 1: 1.2 to 2.5, and the ratio is different, so that the wavelength of the interference light in the infrared wavelength region of each image portion is different and two different. In the infrared wavelength region, one of the two interference thin films has the maximum reflectance and the other has the minimum reflectance, so that one of the image portions is visually recognized due to the difference in reflectance.

  Moreover, the glossy pattern formed body of the present invention is characterized in that a base layer is laminated on a substrate.

  Further, the first image portion and the second image portion in the glossy pattern formed body of the present invention are formed in substantially the same color under a visible light source.

  The printed matter of the present invention can form a printed matter having the same effect as the pair printed matter by changing the thickness of the interference thin film forming the glossy pattern. Therefore, even if a black material having infrared characteristics is not used, it is possible to provide the same effect as that of the pair printed matter, and it is possible to produce a glittering pair printed matter having no limitation in color.

The top view which shows one Example of a glossy pattern formation body (S). The top view explaining a glossy pattern (2). The top view which shows the structure of a 1st image part (3) and a 2nd image part (4). The figure which shows an example of an element. Sectional drawing which shows the difference of the ink film thickness of a 1st image part (3) and a 2nd image part (4). The schematic diagram which shows the difference of the area ratio of a 1st image part (3) and a 2nd image part (4). The schematic diagram which shows the division of a 1st image part (3) and a 2nd image part (4) by the film thickness difference of an ink. The schematic diagram which shows the division by the difference of the area ratio of a 1st image part (3) and a 2nd image part (4). The top view which shows the 1st element (3a) and 2nd element (4a) arrange | positioned without gap. The schematic diagram which shows other arrangement | positioning of a 1st element (3a) and a 2nd element (4a). The top view which shows the structure of a fine element (3b). The top view which shows the other shape of a 1st element (3a) and a 2nd element (4a). The schematic diagram explaining the visual recognition state of a formed body (S). The schematic diagram which shows the glossy pattern (2) which has base printing. The top view explaining the other structure of a glossy pattern (2). An example of arrangement | positioning of a pattern part (3 ') and a camouflage part (4') is shown. The schematic diagram which shows the printed image (2 ') which divided the pattern part (3') and the camouflage part (4 ') by the area ratio. The schematic diagram which shows the difference of an area ratio. The schematic diagram explaining the visual recognition state of a medium (S '). The top view explaining the other structure of a glossy pattern (2).

  Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments to be described below, and various other embodiments can be implemented within the scope of the technical idea described in the claims.

  FIG. 1 is a plan view showing an embodiment of a glossy pattern formed body (hereinafter referred to as “formed body”) (S) in the present invention.

  The formed body (S) is, for example, valuable printed matter such as banknotes, securities, passports, identification cards, and the like, and the color tone is changed in at least a part of the region (Z) on the substrate (1) by changing the observation angle. Has a glossy pattern (2) formed of a material that changes. The glossy pattern (2) is visually recognized as one image under a visible light source, but has secret information that can be visually recognized in the infrared wavelength region.

  The substrate (1) is not particularly limited, such as fine paper, coated paper, plastic, metal, etc., but the lower smoothness is desirable, and specifically, the Beck smoothness is desirably less than 100 seconds. When the base material (1) with high smoothness is used, depending on the material forming the base material (1), the color change of the glossy pattern (2) accompanying the angle change is clear due to the gloss of the base material (1) itself. May not be visible to the eyes and needs attention.

  FIG. 2 is a schematic diagram for explaining the gloss pattern (2), and FIG. 2 (a) is a plan view of the gloss pattern (2). The glossy pattern (2) represents meaningful information such as letters, numbers, patterns, etc., and in FIG. 2 represents the letters “ABC”. The glossy pattern (2) is made of the same material but made of interference thin films having different thicknesses, so that the first image portion (3) shown in FIG. 2 (b) and the first image portion shown in FIG. It is divided into two image parts (4).

  In addition, about the color of a 1st image part (3) and a 2nd image part (4), if it is a color different from a base material, there will be no limitation in particular, Hereinafter, a 1st image part (3) and The case where the second image portion (4) is formed in substantially the same color under a visible light source will be described.

  Although the principle will be described in detail later, the gloss pattern (2), which is visually recognized as one image under a visible light source, is formed in an infrared wavelength region in a predetermined wavelength region by forming with interference thin films having different thicknesses. Only one of the first image portion (3) or the second image portion (4) is visible, and the first image portion (in the infrared wavelength region, in a predetermined wavelength region different from the predetermined wavelength described above) Only the other of 3) or the second image part (4) becomes visible.

  Next, the configurations of the first image portion (3) and the second image portion (4) will be described. The first image portion (3) and the second image portion (4) are formed based on an ink containing a pearlescent pigment having an interference thin film formed on the substrate (1) in a layered manner. There are two methods of forming by printing on the material (1). First, the first image portion (3) and the second image portion (4) are formed by using the interference thin film itself as the base material (1). A description will be given on the assumption that it is formed in a layered shape on top.

  FIG. 3 is a plan view showing the configuration of the first image portion (3) and the second image portion (4). A first image portion (3) shown in FIG. 3 (a1) is a printing portion formed with an interference thin film having one thickness when the glossy pattern (2) is formed with an interference thin film having a different thickness. In (a1), only the character “AC” among the characters “ABC” which is the glossy pattern (2) is represented.

  As shown in the enlarged view of FIG. 3 (a2), the first image portion (3) includes the first elements (3a) arranged in a line at a constant pitch, or FIG. As shown in the enlarged view of a3), the first elements (3a) are arranged in a matrix at a constant pitch.

  In the present invention, each of the first element (3a) and the second element (4a) to be described later is at least one of an image line, a point, and a pixel, or a combination thereof. FIG. 4 is a diagram showing the shape of each element (3a, 4a), and is a plan view showing the first element (3a) as an example.

  The image line is a straight line, a broken line, a wavy line, or a broken wavy line as shown in FIGS. 4 (a), 4 (b), 4 (c), and 4 (d). A point is a point formed on a printed material by a mesh screen, a contact screen, or the like. A plurality of dots and pixels to be described later are arranged in a straight line or a wavy line to form a point group or a pixel group.

  When the first element (3a) configured in a line shape by becoming a point group or a line group is arranged in a line shape, the first image portion (3) shown in FIG. ) The dot shape is not limited to a circular dot, but a random dot or a special halftone dot generation method proposed in Japanese Patent Application Laid-Open No. 11-268228 previously filed by the applicant of the present application is taken into consideration. A special halftone dot shape having a degree of freedom obtained by converting an input image into halftone dots consisting of halftone screens may be used.

  A pixel is a minimum unit obtained by dividing a two-dimensional image such as a figure or a character by vertical and horizontal lines. The pixel shape is circular, elliptical, as shown in FIGS. 4 (e), 4 (f), 4 (g), 4 (h), 4 (i) and 4 (j). Polygonal shape and character shape. The character shape shown in FIG. 4 (h) is generally called a minute character or special halftone dot, but is a pixel in the present invention. Further, as shown in FIGS. 4 (i) and 4 (j), the element may be a combination of an image line, a point, and a pixel, respectively. In addition, about this embodiment, the 1st element (3a) and the 2nd element (4a) are demonstrated as a linear drawing line shown to Fig.4 (a).

  As shown in FIG. 5, in the first image portion (3) and the second image portion (4) described later, the elements that form each image portion have a first pitch (in the first direction (V)). A plurality are arranged in d1).

  The first pitch (d1) and the second pitch (d2) in which the first element (3a) and the second element (4a) are arranged are the printing method, the substrate to be used (1), the element width (W3). ), Each is appropriately set within the range of 100 to 3000 μm.

  In the present invention, since the infrared reflection characteristics of the first image portion (3) and the second image portion (4) are different, only one is visible in the infrared wavelength region. When the first element (3a) and the second element (4a) have the same line width, and the first pitch (d1) and the second pitch (d2) exceed 3000 μm, the pitch is small. In comparison, since the substrate (1) is exposed more, the visibility of the first image portion (3) or the second image portion (4) is lowered, which is not preferable.

  Further, when the first pitch (d1) and the second pitch (d2) are less than 100 μm in which the first element (3a) and the second element (4a) are arranged, as shown in FIG. Since the plurality of first elements (3a) and second elements (4a) are arranged without gaps, the first image portion (3) and the second image are visible to the naked eye under a visible light source. Each part (4) is visually recognized as a solid area.

  When arranged without a gap, the visibility of the first image portion (3) and the second image portion (4) is improved in the infrared wavelength region, which is preferable.

  In FIG. 5, the first pitch (d1) and the second pitch (d2) are both shown as constant pitches, but may be partially different within the above-described range. It is.

  Furthermore, if it is within the above-mentioned range, as shown in FIG. 6A, the first element (3a) and the second element (4a) may have different pitches, or as shown in FIG. 6B. In addition, although the arrangement pitch is the same, the plurality of first elements (3a) and the plurality of second elements (4a) can be arranged shifted in the first direction (V1).

  When each element (3a, 3b) is a line, the line width (W3) of the first element (3a) and the line width (W4) of the second element (4a) are 20 to 2000 μm, respectively. It is possible to set appropriately within the range.

  When the line width (W3, W4) of each element (3a, 4a) is less than 20 μm, depending on the material forming each element (3a, 4a), either observation under visible light or in the infrared wavelength region Even under conditions, the visibility of the glossy pattern (2) deteriorates, which is not preferable.

  In addition, when the line width (W3, W4) of each element (3a, 4a) exceeds 2000 μm, the first element (3a) and the first element (3a) may differ depending on the color of the material forming each element (3a, 4a). A difference in color caused by a difference in thickness between the two elements (4a) becomes visible with the naked eye, which is not preferable.

  Next, the material which forms each element (3a, 3b) is demonstrated. FIG. 7 is a schematic diagram for explaining each element (3a, 3b). FIG. 7 (a) is a cross-sectional view taken along line AA ′ of the first element (3a) shown in FIG. 3 (a2). FIG. 7B is a sectional view taken along the line BB ′ of the second element 4a shown in FIG. 3B2.

  The first element (3a) shown in FIG. 7 (a) is composed of the first interference thin film (P1), and the second element (4a) shown in FIG. 7 (b) is the second interference thin film (P2). ). Each interference thin film (P1, P2) is a thin film having a characteristic that the hue changes by interference light, so-called color flip-flop, and is a metal oxide such as titanium oxide, iron oxide, chromium oxide, cobalt oxide, tin oxide. is there.

  The first interference thin film (P1) and the second interference thin film (P1) are made of the same material but have different thicknesses. For example, in FIG. 7, the thickness (h1) of the second element (4a) shown in FIG. 7 (b) is thicker than the thickness (h1) of the first element (3a) shown in FIG. 7 (a). . In the present invention, the first element (3a) forming the first image portion (3) and the second element (4a) forming the second image portion (4) are made of the same material, but the thickness is the same. Due to the difference in infrared reflection characteristics due to the difference, only one is visible in the infrared wavelength region.

  FIG. 8 is a graph showing reflected light spectra of the first interference thin film (P1) and the second interference thin film (P2), where the vertical axis represents reflectance (%) and the horizontal axis represents wavelength (nm). .

  The first interference thin film (P1) that forms the first image portion (3) and the second interference thin film (P2) that forms the second image portion (4) both contain a functional material. Although the thickness (d1, d2) is different, it is characterized in that the reflection characteristics in the infrared wavelength region of the two image portions are made different as in the case of the metameric pair printed matter.

  By changing the thickness (d1, d2) of each interference thin film (P1, P2), the reflected wavelength changes from the principle of thin film interference. The principle of thin film interference is that when the interference color changes, the reflectance in the infrared wavelength region also changes at the same time.

(Formula 1)

  In Equation 1, when the refractive index of the thin film is n, the thickness of the thin film is d, the incident angle of light is θ, and the wavelength of light is λ, the reflectance is maximum (hereinafter, the reflectance is maximum). The wavelength λ, which is referred to as “maximum reflectance”, is expressed as the following equation 1. In the present invention, the refractive index n of the thin film is the refractive index of the interference thin film, and the thickness d of the thin film is the thickness of the interference thin film.

  In Equation 1, m is a positive integer (in FIG. 8, 0 is the first peak from the right, 1 is the second peak from the right, 2 is the third peak from the right,... M is m + 1 from the right. The second peak).

  Further, the wavelength at which the reflectance is minimum (hereinafter, the minimum reflectance is referred to as “minimum reflectance”) is expressed by the following Expression 2.

(Formula 2)

  FIG. 9 is a diagram showing a reflection spectrum at an incident angle of 45 degrees of an interference thin film having a refractive index (n) of 1.33 and a thickness (d) of 500 nm as an example. The refractive index of the present invention is a value measured using an Abbe refractometer.

  The incident angle is an angle indicating how light is incident on the interference thin film, and is an angle at which the interference thin film reflects other than 0 degree parallel or 90 degrees perpendicular to the interference thin film. Any angle is good.

  For example, when the light is incident on the interference thin film at 45 degrees, the wavelength of the maximum reflectance is calculated from Equation 1, and the product of the thickness of the interference thin film and the refractive index is shown in FIG. 8 times, 1.33 times shown in FIG. 9 (d) and 4 times shown in FIG. 9 (f). Further, when the light is incident on the interference thin film at 45 degrees, the wavelength of the minimum reflectance is calculated from Equation 2, and the product of the thickness of the interference thin film and the refractive index is shown in FIG. 66 times, 1 time shown in FIG. 9C and 2 times shown in FIG. Among these, the infrared wavelength region is a wavelength region of 800 to 2000 nm shown in FIG. When observed with an infrared camera, it is visually recognized as white when the reflectance in the infrared wavelength region is high, and is visually recognized as black when the reflectance in the infrared wavelength region is low.

  The wavelength λ that provides the maximum reflectance or minimum reflectance of the interference thin film is determined by the product of the thickness and refractive index of the interference thin film. However, in the present invention, the first interference thin film (P1) that forms the first image portion (3) and the second interference thin film (P2) that forms the second image portion (4) are the same material. Therefore, the refractive index becomes equal. In the case of the interference thin film made of the same material, the numerical values in Expressions 1 and 2 are fixed except for the thickness of the interference thin film. Therefore, it is possible to change the wavelength λ of the maximum reflectance by changing the thickness of the interference thin film.

  As described above, when observed with an infrared camera, when the reflectance in the infrared wavelength region is high, it is visually recognized as white, and when the reflectance in the infrared wavelength region is low, it is visually recognized as black. When the printed matter consisting of is observed with an infrared camera, it is visually recognized as black in FIG. 9E and white as viewed in FIG. 9F.

  The first interference thin film (P1) forming the first image portion (3) is the interference thin film shown in FIG. 9, and the first image portion (3) and the second image portion (4) are a pair of printed matter. In this case, the interference thin film forming the second image portion (4) needs to be visually recognized as white in FIG. 9E and visible as black in FIG. 9F. That is, FIG. 9 (e) needs to have the maximum reflectance, and FIG. 9 (f) needs to have the minimum reflectance.

  Therefore, when one of the first image portion (3) and the second image portion (4) has the maximum reflectance in the infrared wavelength region shown in FIG. 9 (V), the other has the minimum reflectance. In addition, when one has the minimum reflectivity, the other is the maximum reflectivity. By forming the interference thin film with the thickness, the light and darkness (black and white) is reversed in the infrared wavelength range. It is possible to visually check.

  When the first interference thin film (P1) and the second interference thin film (P2) made of the same material calculate a combination of thicknesses (d1, d2) where light and darkness are reversed in an infrared wavelength region of 800 to 2000 nm, Equations 1 and 2 and Equations 3 and 4 below are obtained.

  First, using Equation 1, the wavelength λ at which the first interference thin film (P1) has the maximum reflectance is obtained. As described above with reference to FIG. 9, since the refractive index of the first interference thin film (P1) is 1.33, the refractive index n of Equation 1 is 1.33. The thickness d was 400 nm. In addition, since the wavelength λ at which the maximum reflectance is obtained is assumed, for example, the first peak (f) from the right indicating the maximum reflectance is assumed, and when m is 0, the wavelength λ at which the maximum reflectance is obtained. Was 1504 nm. That is, when the first interference thin film (P1) is formed with a thickness (d1) of 400 nm, the wavelength λ at which the maximum reflectance is 1504 nm.

  Next, the wavelength λ when the first interference thin film (P1) having the thickness (d1) of 400 nm has the minimum reflectance is obtained using Equation 2. Similar to Equation 1, the refractive index n was 1.33 and the thickness d was 400 nm. Further, since the wavelength λ when the minimum reflectance is obtained is assumed, for example, the second peak from the right (e) indicating the minimum reflectance is assumed, and m is set to 1, where the minimum reflectance is obtained. The wavelength λ was 752 nm. That is, when the first interference thin film (P1) is formed with a thickness (d1) of 400 nm, the wavelength λ at which the minimum reflectance is 752 nm.

  From Equation 1 and Equation 2, when the thickness (d1) of the first interference thin film (P1) is 400 nm, the wavelength λ that is the maximum reflectance is 1504 nm, and the wavelength λ that is the minimum reflectance is 752 nm. Next, the first interference thin film (P1) and the second interference thin film (P2) are visually recognized in the same manner as the pair printed matter in which light and darkness (black and white) are reversed in the infrared wavelength region. ) Thickness (d2).

  Specifically, the second interference thin film (P2) has the minimum reflectance at the wavelength λ1504 nm, which is the maximum reflectance of the first interference thin film (P1), and the minimum reflection of the first interference thin film (P1). The second interference thin film (P2) needs to have the maximum reflectance at the wavelength λ752 nm at which the reflectance is obtained. Therefore, what is the thickness (d2) of the second interference thin film (P2), the relationship between the maximum reflectance and the minimum reflectance described above is obtained.

  First, the provisional thickness (d2 ') of the second interference thin film (P2) is calculated using the above-described formula 1. Here, the reason for calculating the provisional thickness (d2 ′) is that when the wavelength is the maximum reflectance of the first interference thin film (P1) in order to be visually recognized in the same manner as the pair printed matter, The second interference thin film (P2) needs to have the maximum reflectance when the interference thin film (P2) has the minimum reflectance and the wavelength has the minimum reflectance of the first interference thin film (P1).

  Although the thickness (d2) at which the second interference thin film (P2) has the minimum reflectance can be obtained at the wavelength at which the maximum reflectance of the first interference thin film (P1) can be obtained in Equation 1, In order for the second interference thin film (P2) to have the maximum reflectance when the thickness (d2) is the wavelength that provides the minimum reflectance of the first interference thin film (P1), the condition of Expression 2 must also be satisfied. Whether or not this is satisfied is calculated by calculating the provisional thickness (d2 ′) of the second interference thin film (P2) using Expression 1, and then calculating the provisional thickness (d2 ′) using Expression 2 The thickness (d2) of the second interference thin film (P2) is not obtained until the condition is satisfied. Therefore, the second interference thin film (P2) calculated by Equation 1 has a temporary thickness (d2 ').

  Since the second interference thin film (P2) is the same material as the first interference thin film (P1), the refractive index n is 1.33. Further, when the wavelength λ is set to 752 nm and m is set to 1 based on the calculation result of Expression 2 described above, Expression 3 is obtained. Formula 3 is a formula in which the refractive index 1.33 and m = 1 are substituted into Formula 1 described above.

(Formula 3)

  The provisional thickness (d2 ′) calculated from Equation 3 is 600 nm. Next, when the provisional thickness (d2 ′) of the second interference thin film (P2) is 600 nm, the second interference thin film has a wavelength at which the first interference thin film (P1) has the minimum reflectance. It was calculated whether (P2) was the maximum reflectance. Formula 4 is a formula in which the refractive index of 1.33, m = 1, and d = 600 nm are substituted into Formula 2 described above.

(Formula 4)

  When the wavelength at which the maximum reflectance was calculated when the thickness was 600 nm from Equation 4, it was 1120 nm. Therefore, by setting the thickness (d1) of the first interference thin film (P1) to 400 nm and the thickness (d2) of the second interference thin film (P2) to 600 nm, the first interference thin film (P1) is maximized. The second interference thin film (P2) exhibits a minimum reflectance of 752 nm at a wavelength λ1504 nm indicating reflectance, and the second interference thin film (P1) exhibits a minimum reflectance at a wavelength λ752 nm. The interference thin film (P2) has a maximum reflectance of 1120 nm. Therefore, the first interference thin film (P1) and the second interference thin film (P2) are visually recognized in the same manner as the pair printed matter in which light and dark (black and white) are reversed in the infrared wavelength region.

  As described above, the wavelength having the maximum (or minimum) reflectance is determined from the product of the thickness (d) and the refractive index (n) of the interference thin film. Therefore, when the thickness (d1) of the first interference thin film (P1) is set to 1 using the above formulas 1 to 4, what is the thickness (d2) of the second interference thin film (P2)? In the case where the first interference thin film (P1) and the second interference thin film (P2) are calculated in the same way as the pair printed matter, the brightness and darkness (black and white) are reversed in the infrared wavelength region. It was within the range of the following formula 5.

(Formula 5)
d1 · n: d2 · n (or d2 · n: d1 · n) = 1: 1.2 to 2.5
As shown in Equation 5, the product of the thickness (d1) and the refractive index (n) of the first interference thin film (P1)

The product of the thickness (d2) and the refractive index (n) of the second interference thin film (P2) is in the range of 1: 1.2 to 2.5.

Then, in the infrared wavelength region, when one has the maximum reflectance, the other has the minimum reflectance. Therefore, in the interference thin film of the same material, two interference thin films are prepared by setting the product of the thickness and refractive index of one interference thin film to 1 and the product of the thickness and refractive index of the other interference thin film to 1.2 to 2.5. After that, the first image portion (3) is formed by one (or the other) interference thin film, and the second image portion (3) is formed by the other (or one) interference thin film, so that the infrared wavelength is increased. It is possible to view the image in the same manner as a pair printed matter in which light and dark (black and white) are reversed.

  FIG. 10 is a diagram showing the interference wavelength of an interference thin film having a thickness ratio of 1: 2. As an example, in FIG. 10, using the interference thin film of the same material, the thickness (d1) of the first interference thin film (P1) is 600 nm, and the thickness (d2) of the second interference thin film (P2) is 300 nm. It was. As shown in FIG. 10, when the ratio of the product of the thickness of the interference thin film and the refractive index is in the range of 1: 1.2 to 2.5, when one has the maximum reflectance in the infrared wavelength region, the other is Minimum reflectance.

  FIG. 11 is a diagram illustrating a comparative example in which the thickness ratio is less than 1: 1.2, and is a diagram illustrating the interference wavelength of an interference thin film having a thickness ratio of 1: 1.1. As an example, in FIG. 11, using the interference thin film of the same material, the thickness (d1) of the first interference thin film (P1) is 550 nm, and the thickness (d2) of the second interference thin film (P2) is 500 nm. It was. As shown in FIG. 11, when the ratio of the product of the thickness of the interference thin film and the refractive index is in the range of 1: 1.1 or less, the reflectance of the two interference lights is close, so that the brightness is not reversed in the infrared wavelength region. Therefore, it is impossible to visually recognize the same as the pair printed matter.

  FIG. 12 is a view showing a comparative example in which the thickness ratio exceeds 1: 2.5, and shows the interference wavelength of the interference thin film having a thickness ratio of 1: 2.6. As an example, in FIG. 12, using the interference thin film of the same material, the thickness (d1) of the first interference thin film (P1) is set to 1000 nm, and the thickness (d2) of the second interference thin film (P2) is set to 385 nm. It was. As shown in FIG. 12, in the range where the ratio of the product of the thickness and the refractive index exceeds 1: 2.5, the maximum reflectance of the first interference thin film (P1) and the first reflectance as shown in FIG. Since the maximum reflectance of the second interference thin film (P2) is close, light and dark do not invert in the infrared wavelength region. Therefore, it is impossible to visually recognize the same as the pair printed matter.

  For the above reasons, in order to visually recognize the same as the pair printed matter using the interference thin film of the same material, the thickness (d1) of the first interference thin film (P1) and the thickness of the second interference thin film (P2). The ratio of the refractive index of (d2) needs to be in the range of 1: 1.2 to 2.5.

  In addition, when the base material (1) does not have smoothness, since each interference thin film (P1, P2) mentioned above does not interfere, a hue does not change by an angle change, and design property falls. Therefore, even when the base material (1) does not have smoothness, the base layer (F1, F2) is formed on the base material (1) in order to impart a change in hue to each interference thin film (P1, P2). It is preferable to form each interference thin film (P1, P2) on the base layer (F1, F2).

  FIG. 13 is a schematic diagram showing interference thin films (P1, P2) having a base layer (F1, F2) on a substrate (1). The base layers (P1, P2) are materials that serve as a base for applying each interference thin film (P1, P2), and are PET film, aluminum, mica, glass flakes, and the like. The surface of the base layer (F1, F2) has a flat shape in order to provide the interference thin films (P1, P2). As described above, even when the surface of the base material (1) has irregularities, the interference thin film (P1, P2) causes interference, and the hue changes due to the angle change. F2) is provided. In addition, when the surface of a base material (1) is a flat shape, since a base material (1) plays the role of a base layer (F1, F2), there may not be a base layer (F1, F2).

  Next, a method for forming each element (3a, 4a) will be described. As described above, each element (3a, 4a) forming the first image portion (3) and the second image portion (4) is formed by laminating each interference thin film (P1, P2) on the substrate (1). Or an ink containing a pearl pigment having each interference thin film (P1, P2) is printed on the substrate (1).

  When each element (3a, 4a) is formed by applying each interference thin film (P1, P2) in a layered manner on the substrate (1), the substrate formed on the substrate (1) or the substrate (1) On the layer (F1, F2), the material for forming each of the interference thin films (P1, P2) described above is deposited by vacuum deposition, precipitation treatment or sputtering. In addition, the thickness of the interference thin film (P1, P2) is formed to a desired thickness by being changed by increasing / decreasing each time of vacuum deposition, precipitation treatment, or sputtering.

  The first image portion (3) and the second image portion (4) described above are not limited in color to be formed under a visible light source, and may be substantially the same color or different from each other. By forming the part (3) and the second image part (4) in substantially the same color, the gloss pattern (2) shown in FIG. 2 (a) described above is formed with a single color ink under a visible light source. Although it is visually recognized as one image, each image portion (3, 4) can be visually recognized as a latent image in the infrared wavelength region.

  In order to form the first image portion (3) and the second image portion (4) in substantially the same color under a visible light source, each element (3a, 3b) forming each image portion (3, 4) is used. ) Is formed by printing the ink on the base material (1) after adding the pigment to the ink containing the pearl pigment having each interference thin film (P1, P2) to make the color substantially the same color. The color and amount of the pigment are appropriately adjusted so that the pigment can be visually recognized as substantially the same color under a visible light source, depending on the pearl pigment used, the ink film thickness of each element (3a, 3b), and the like. When each element (3a, 4a) is formed by printing an ink containing a pearl pigment having each interference thin film (P1, P2) on the substrate (1), the base layer (F1, F2) and the interference thin film It is formed using a pearl ink composed of (P1, P2).

  FIG. 14 is a schematic diagram showing each element (3a, 4a) formed of pearl ink. The first element (3a) shown in FIG. 14 (a1) and the second element (4a) shown in FIG. 14 (b1) are each formed of pearl ink.

  FIG. 14 (a2) is a schematic diagram showing the first pearl pigment (Q1) contained in the pearl ink forming the first element (3a), and FIG. 14 (b2) shows the first element (3a). Is a schematic diagram showing a second pearl pigment (Q2) contained in the pearl ink forming the). The first pearl pigment (Q1) and the second pearl pigment (Q2) include the first base layer (F1) and the second base layer (F2), the first interference thin film (P1) and the second base layer (F1). The materials for forming the interference thin film (P2) are the same. For example, when the first base layer (F1) is mica and the first interference thin film (P1) is iron oxide, the second base layer (F2) is mica and the second interference thin film (P2) is Let it be iron oxide.

  In addition, in the present invention, the configuration in which the ink containing the pearl pigment having the base layer (F1, F2) and each interference thin film (P1, P2) is printed on the substrate (1) is the same as that of FIG. Similar to the configuration, it will be described as one of the configurations in which the base layer (F1, F2) is laminated on the substrate (1).

  As described above, the interference thin films (P1, P2) included in the pearl pigments (Q1, Q2) are the same as the first printed thin films (P1) in order to be visually recognized in the same manner as the pair prints. And the thickness (d2) of the second interference thin film (P2) are in the range of 1: 1.2 to 2.5. When each pearl pigment (Q1, Q2) is used, each element (3a, 4a) is formed on the substrate (1) by a printing method capable of pearl printing such as screen printing and gravure printing.

  Next, the visual recognition state of the formed body (S) having the above configuration will be described with reference to FIG. 15A1 and 15A2 show, as an example, the first image portion (3) is formed by the first interference thin film (P1) shown in FIG. 7A, and the second image portion (4 ) Is a schematic view and a plan view when the formed body (S) formed by the second interference thin film (P2) shown in FIG. 7B is observed with specularly reflected light under a visible light source. b1) and FIG.15 (b2) are the schematic diagram and top view at the time of observing the formation body (S) of Fig.15 (a) with the diffuse reflected light under a visible light source.

  In FIG. 13, when the first image portion (3) and the second image portion (4) are formed of the first interference thin film (P1) and the second interference thin film (P2) of the same color, FIG. As shown in (a1), when the formed body (S) is observed in specularly reflected light under a visible light source, the first image portion (3) and the second image portion (4) are interference thin films of the same color. Since it is formed, it cannot be visually recognized with the naked eye. Therefore, as shown in FIG. 15 (a2), the glossy pattern (2) is visually recognized as an image having a uniform density. In addition, when each interference thin film (P1, P2) is made of transparent pearl ink, it is impossible for the naked eye to visually recognize the glossy pattern (2).

  Further, as shown in FIG. 15 (b1), when the formed body (S) is observed with diffuse reflected light under a visible light source, the first interference thin film (P1) and the second interference thin film as described above. (P2) causes interference, and the glossy pattern (2) “ABC” is visually recognized as a pattern having glitter.

  Next, the visual recognition state when the formed body (S) is observed in the infrared wavelength region will be described. As shown in FIG. 16 (a1), when the formed body (S) is observed at 750 nm which is an infrared wavelength region, the first interference thin film (P1) has a minimum reflectance around 750 nm as described above. Therefore, it is visually recognized as black. Further, the second interference thin film (P2) has a maximum reflectance near 750 nm and is visually recognized as white, so that it is visually recognized as the same color as the base material (1), and the letter “B” can be visually recognized. Can not. Therefore, as shown in FIG. 16 (a2), only the character “AC” that is the first image portion (3) is visible.

  Further, as shown in FIG. 16 (b1), when the formed body (S) is observed at 1500 nm which is an infrared wavelength region, as described above, the first interference thin film (P1) has a maximum reflection around 1500 nm. Since it becomes a rate, it is visually recognized as the same color as the base material (1) by being visually recognized as white, and the character “AC” cannot be visually recognized. The second interference thin film (P2) is visually recognized as black because it has a minimum reflectance near 1500 nm. Therefore, as shown in FIG. 16 (b2), only the letter “B” which is the second image portion (4) is visible.

  Further, in FIG. 16, in order to improve the concealability of each image portion (3, 4) under the visible light source, the character “AC” among the characters “AC” of the first image portion (3) under the visible light source. Only “A” and the character “B” which is the second image portion (4) are formed of the same color pearl colored ink, and only the character “C” of the first image portion (3) is a pearl colored of a different color. You may form with ink.

  For example, in the glossy pattern (2), when the letters “A” and “B” are formed with pink pearl ink and the letter “C” is formed with green pearl ink, When the formed body (S) is observed with the naked eye, the letter “AB” is visually recognized in pink pearl color and the letter “C” is visually recognized in green pearl color in the glossy pattern (2).

  Actually, the image visible in the infrared wavelength region (750 nm) is the letter “AC” of the first image portion (3), and the image visible in the other infrared wavelength region (1500 nm) is The letter “B” in the second image portion (4) is the same color as the ink color of a part of the first image portion (3) and the second image portion (4). By making only the character “C”, which is a part of (3), a different color, the observer feels that the secret information is attached to the character “C”.

  Thus, by making a part of the first image portion (3) and the second image portion (4) the same color, it is possible to obtain an effect that different colors are visually recognized as dummy information. .

  Next, another configuration of the glossy pattern (2) will be described.

  FIG. 17 is a plan view for explaining another configuration of the glossy pattern (2). As shown in FIG. 2, the glossy pattern (2) described above includes the first image portion (3) and the second image portion (4) in the region (Z). In FIG. 17, the second image portion (4 ′) is disposed around the first image portion (3 ′).

  The first image portion (3 ') and the second image portion (4') are formed of the same color interference thin film, and the thickness of the interference thin film is different as in the above-described configuration. When the second image portion (4 ′) is arranged around the first image portion (3 ′), the interference reflection thin film formed under the visible light is formed with the same color interference thin film, so that it is identified with the naked eye. The first image portion (3 ′) and the second image portion (4 ′) are visually recognized in the same color. Therefore, the glossy pattern (2 ') is visually recognized as a solid pearl print region of uniform color.

  When the medium (S ′) is observed in the mid-infrared wavelength region and the far-infrared wavelength region, the first image portion (3 ′) and the second image portion (4 ′) are the film thickness of the interference thin film. Due to the difference, a difference in brightness occurs and is visually recognized. Therefore, the meaningful information of “JP” as the first image portion (3 ′) can be visually recognized as a glossy image in the glossy pattern (2 ′).

  When the second image portion (4) is arranged around the first image portion (3), the first element (3a) and the second element forming each image portion (3 ′, 4 ′) Due to the pitch difference when arranging a plurality of elements (4a), the contour of the first image portion (3) is emphasized. Therefore, it is preferable that the elements (3a, 4a) to be formed have the same pitch.

  Note that the arrangement of the first image portion (3 ′) and the second image portion (4 ′) is not limited to the arrangement shown in FIG. 17 and is glossy under a visible light source by being at least partially adjacent. An arrangement in which the pattern (2 ′) and the second image portion (4 ′) can be visually recognized as an area formed of the same color interference thin film and the shape of the first image portion (3 ′) cannot be identified. If so, it can be set as appropriate.

  FIG. 18 is a plan view showing an example of the arrangement of the first image portion (3 ′) and the second image portion (4 ′). As shown in FIG. 18A, the second image portion (4 ') may be disposed so as to be adjacent to a part of the first image portion (3'). As shown in FIG. 18B, the number of the first image portions (3 ') is not limited to one, and a plurality of first image portions (3') may be arranged. Further, as shown in FIG. 18 (c), the first image portion (3 ') may be disposed around the second image portion (4'), and the arrangement opposite to that in FIG.

  FIG. 18 shows a gloss pattern (2 ′) in which the second image portion (4 ′) is arranged around the first image portion (3 ′), as in FIG. , Consisting of a pattern element (3a ′) which is a line-like drawing line. The first image portion (3 ′) and the second image portion (4 ′) are formed from the line-shaped image line by the first pattern element (3a ′) and the first pattern element (4a ′). , Each can be configured.

  Next, the visual recognition state of the medium (S ′) configured as shown in FIG. 17 will be described. FIG. 19 shows an example in which the first image portion (3 ′) is formed with the ink containing the first pearl pigment (Q1) shown in FIG. 14 (a2), and the second image portion (4 ′). FIG. 14B is a schematic diagram and a plan view of the medium (S ′) formed with the ink containing the second pearl pigment (Q2) shown in FIG. 14B2 when observed at 750 nm that is an infrared wavelength region. FIGS. 19 (b1) and 19 (b2) are a schematic view and a plan view when the medium (S ′) of FIG. 18 (a) is observed at 1500 nm, which is another infrared wavelength region.

  As shown in FIG. 19 (a1), when the formed body (S) is observed at 750 nm, the first interference thin film (P1) is visually recognized as black because the infrared reflectance is low as described above. . Further, the second interference thin film (P2) is visually recognized as white because it has a high infrared reflectance, so that it is visually recognized as the same color as the base material (1), and the second image portion (4 ′) is visually recognized. Can not do it. Therefore, as shown in FIG. 19 (a2), the character “JP” which is the first image portion (3 ′) is visible.

  Further, as shown in FIG. 19 (b1), when the formed body (S) is observed at 1500 nm which is another infrared wavelength region, the first interference thin film (P1) is reflected by infrared rays as described above. Since the rate is high, it is visually recognized as the same color as the base material (1) by being visually recognized as white, and the letter “JP” cannot be visually recognized. The second interference thin film (P2) is visually recognized as black because of its low infrared reflectance. Therefore, as shown in FIG. 19 (b2), a density difference is generated between the first image portion (3 ′) and the second image portion (4 ′) arranged around the first image portion (3 ′), and the first image portion (3 ′ ) Which is a character “JP”.

  Next, another configuration of the glossy pattern (2) will be described.

  FIG. 20 is a plan view for explaining another configuration of the glossy pattern (2 '). The glossy pattern (2 ″) shown in FIG. 20A is formed by arranging a plurality of raised image lines made of pearl ink on the surface of the substrate (1). As shown in FIGS. 20B and 20C, the glossy pattern (2 ″) is composed of a pattern portion (2a) and a background portion (2b) that are made of image lines having different arrangement directions. When the glossy pattern (2 ″) is visually recognized by changing the observation angle, the reflected light quantity from the pattern part (2a) and the background part (2b) is different, so that the pattern part (2a) and the background around it. The part (2b) appears from a positive image to a negative image. Note that the details of the glossy pattern (2 ″) in FIG. 20 are described in Japanese Patent No. 3718712, and thus the description thereof is omitted.

  In the glossy pattern (2 ″) of FIG. 20A, the first image portion (3 ″) and the second image portion (4 ″) shown in FIG. In the same way as in the configuration described above, when the interference thin films are formed with different thicknesses, the image is displayed by a simple authentication method of changing the observation angle in addition to the effect of the infrared pair image described above. It is possible to give an effect that appears.

  Hereinafter, the present invention will be described more specifically with reference to Example 1, but the present invention is not limited thereto. As Example 1, a formed body (S) on which the glossy pattern (2) shown in FIG. The first image portion (3) and the second image portion (4) in the glossy pattern (2) are respectively a first element (3a) and a second element (4a) that are line-shaped image lines. ).

  The first element (3a) constituting the first image part (3) and the second element (4a) constituting the second image part (4) both have an image line width of 310 μm and a pitch of 1 mm. Arranged.

  The first image portion (3) and the second image portion (4) were both formed using the ink prepared by the formulation shown in Table 1 above.

  The first pearl pigment (Q1) forming the first image portion (3) was “Iriodin 325” manufactured by Merck, and the thickness of the first interference thin film (P1) was 400 nm. The second pearl pigment (Q2) forming the second image portion (4) was “Iriodin 326” manufactured by Merck, and the thickness of the second interference thin film (P2) was 600 nm. In addition, “UV TUB-000” manufactured by Teikoku Ink Manufacturing Co., Ltd. was used for the screen medium, and “SC5540” manufactured by Toray Dow Corning Co., Ltd. was used as the antifoaming agent.

  The first image portion (3) and the second image portion (4) were formed by printing on the base material (1) with a screen printer using “Shiraoi” made by Kishu Paper.

  When the formed body (S) produced in Example 1 was observed under a visible light source, the glossy pattern (2) was visually recognized as a printed pattern composed of one color of pearl ink.

  Next, when the formed body (S) was observed at 750 nm using an infrared camera, the first image portion (3) was visible in black, the second image portion (4) was white, and the substrate (1). It was visible with the same color. Therefore, in the glossy pattern (2), the character “AC” as the first image portion (3) was visible.

  Next, when the formed body (S) was observed at 1500 nm using an infrared camera, the first image portion (3) was white and could be visually recognized in the same color as the base material (1), and the second image portion ( 4) was visible in black. Therefore, in the glossy pattern (2), the letter “B” as the second image portion (4) was visible.

  As mentioned above, although embodiment was described based on the Example which concerns on this invention, it is not limited to the said Example, In the range of the technical thought of a claim, there are many other Examples. Needless to say.

DESCRIPTION OF SYMBOLS 1 Base material 2, 2 ', 2''Glossy pattern 2a Pattern part 2b Background part 3, 3', 3 '' 1st image part 3a 1st element 4, 4 ', 4''2nd image part 4a Second element P1 First interference thin film P2 Second interference thin film F1, F2 Base layers S, S ′, S ″ Glossy pattern forming body Z region

Claims (3)

At least a part of the substrate has a gloss pattern composed of a first image portion and a second image portion,
The first image portion has a first interference thin film,
The second image portion has a second interference thin film,
The first interference thin film and the second interference thin film are the same material, and the ratio of the product of the thickness and refractive index of each interference thin film is 1: 1.2 to 2.5,
Because the ratio is different, the wavelength of the interference light in the infrared wavelength region of each image portion is different, and in two different infrared wavelength regions, one of the two interference thin films has the maximum reflectance and the other is the minimum. A glossy pattern forming body characterized in that either one of the image portions is visually recognized due to the difference in reflectance due to the reflectance.   The glossy pattern formed body according to claim 1, wherein a base layer is laminated on the base material.   3. The glossy pattern forming body according to claim 2, wherein the first image portion and the second image portion are formed in substantially the same color under a visible light source.

Images