JP2010269476A - Information carrier capable of discriminating authenticity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information carrier for discriminating authenticity which can recognize two images by changing an angle of observation under visible light, and furthermore, in a specified wavelength region, can visualize a different image from the images recognized under the visible light. <P>SOLUTION: The information carrier capable of discriminating the authenticity has a printing region in at least a part of a substrate, and the printing region comprises a first printing layer in which a third image is formed by a difference of dot area ratios using a metameric pair ink, and a first image is formed of paired images for arranging the dots composing the third image by hair omission doubling, and a second printing layer in which a second image is formed by making the orientation direction of image lines formed of a thickened transparent ink to be different on the first printing layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention changes the observation angle under visible light, particularly in the field of valuable printed materials such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed materials that require anti-counterfeiting effects. This has the effect of changing the image that can be visually recognized, and when illuminated with light in a specific wavelength region or observed with light of a wavelength other than the visible light region, it differs from the image that was visually recognized under visible light. The present invention relates to an information carrier for anti-counterfeiting or authenticity discrimination where an image can be visually recognized.

  In recent years, anti-counterfeiting elements and printing techniques having new design properties and high anti-counterfeiting effects have been desired for valuable printed matter that requires security. For this reason, it is embedded only when an optical security element such as a hologram whose image changes depending on the viewing angle, that is, a printed matter that has an anti-counterfeiting effect that varies in appearance, or meets specific conditions. There is a print with excellent secrecy that can authenticate a latent image.

  The anti-counterfeit printed matter exhibiting optical changes as described above is generally expensive and requires special equipment and materials, so an additional manufacturing process is required and the cost is high. There was a problem of becoming.

  Therefore, the present applicant forms a swelled image line using a plane-oriented pearl pigment, and has a configuration in which the image line angle is different between the background information part and the message information part, and only when observed obliquely. The invention has been filed for an invention relating to a printed matter capable of authenticating whether the message information part changes from positive to negative or from negative to positive (see, for example, Patent Document 1 and Patent Document 2). .

  The printed matter disclosed in Patent Document 1 and Patent Document 2 has a background image and a message image formed by an image line structure that is raised on the surface of the base material, and an image line pattern of the background image Since the line pattern of the message image is formed at different angles, the message image is hardly visible to the naked eye in the angular region where diffuse reflection light is dominant, and regular reflection light is dominant from diffuse reflection light. As the angle region changes, the background image and the message image having a bulge are structured to reflect light different from the incident light, and the message image is visually recognized as a negative image or a positive image.

  Contrary to these anti-counterfeiting prints that place emphasis on these changes in appearance, anti-counterfeiting technology with excellent secrecy can be used in the same way, which allows only a limited number of users to check the embedded images that can be authenticated. It is important. As an example of this technique, there is a technique in which an embedded image cannot be recognized by observation in the visible light region, and the embedded image can be viewed only when observed with light in a specific wavelength region.

  In view of this, the present applicant arranges a plurality of sets of one first region and one second region adjacent to the first region, and the periphery of each second region is a plurality of first regions. The first region has a larger area than the second region, and the second region is composed of a region 2a composed of black ink containing an infrared-absorbing dye and infrared absorption. 2b, which is a black system composed of ink that does not contain a sex pigment, and according to the ratio of the 2a region to the 2b region in each second region, a plurality of regions An application has been filed for a halftone dot printed material characterized in that a gradation image is formed by the area 2a in the second area (see, for example, Patent Document 3). In this halftone printed matter, the embedded image cannot be visually recognized by observation in the visible light region, and the embedded image can be visually recognized by observation in the infrared region. Therefore, since it is not noticed visually that an invisible embedded image is added to a visible image, it is an effective means for preventing forgery with an emphasis on confidentiality.

  In addition, as in the case of the above-mentioned Patent Document 3, the applicant can use a special halftone dot configuration or image line configuration to visually recognize the first image expressed in grayscale in the observation in the visible light region. (See, for example, Patent Documents 4, 5 and 6), the printed image is a second image only in a specific wavelength region. In order to make it appear, the metameric pair ink is used to constitute the information part and the background part of the second image, without using a special and expensive device such as an infrared irradiation device, There is an effect that authenticity determination can be performed only by using a simple filter.

Japanese Patent No. 3718712 Republished Patent W02003 / 013871 Japanese Patent No. 3544536 JP 2008-49570 A JP 2008-68510 A JP 2008-68511 A

  However, the printed matter described in Patent Document 1 that can be distinguished from authenticity appears when the message portion changes from a negative image to a positive image or from a positive image to a negative image depending on the incident angle of light when observed obliquely. However, meaningful images other than the message image could not be visually recognized, and it was impossible to switch between two different images.

  Moreover, in the printed matter described in Patent Document 2, the printed image of Patent Document 1 is used to make the observer visually recognize a meaningful image that has no correlation with the message image. Before printing, it was necessary to form a first image with a low-density ink in advance. In addition, in order to clearly switch the low-density first image and the message image based on the image line having the bulge, the first image must disappear in the observation region where the message image is visually recognized. Therefore, the first image needs to be an image with high (light) brightness, and the visibility of the first image needs to be kept low.

  In addition, the printed matter described in Patent Document 3 is an excellent invention that can easily create a printed matter with a high degree of authenticity discriminating even with a commercially available inkjet printer, but it is visually visible in a visible image. In order to form impossible embedded images, a special fine structure halftone dot configuration is required. When printing by offset printing, etc., precise printing is required, and mass production is possible while maintaining stable quality. It is difficult to do this, and there is a problem that authenticity determination cannot be performed unless a special determination device is used.

  Further, in Patent Documents 4, 5, and 6, an image that appears only at a specific wavelength is embedded in a gradation image under visible light, and it is possible to authenticate only by using a simple filter as a discriminator. Although it has the effect of being able to discriminate, it still cannot authenticate unless it has a discriminator, and it is not that anyone can perform authenticity anywhere on the spot.

  Therefore, the present invention allows the first image to be viewed under visible light, and can be viewed by switching to the second image by changing the observation angle. In addition to performing false discrimination and using a predetermined filter to obtain further credibility, three images appear under three different observation conditions that the third image can be viewed, providing a more advanced anti-counterfeit effect. It is an object of the present invention to provide an information carrier for playing.

  In order to solve the above-described problems, the present invention has a print area on at least a part of the substrate, includes three images in the print area, and the three images can be visually recognized by changing the observation conditions. An information carrier capable of authenticating authenticity, wherein the printing area has a first printed layer formed of a metameric pair ink different from the color of the base material, and a color flip-flop on the first printed layer A second printed layer formed of a transparent ink containing a material having a property of being permeable, and the first printed layer is formed of a plurality of metameric inks using a first metameric ink. A third image formed by arranging image elements and a pair image formed by arranging a plurality of image elements using the second metameric ink of the metameric pair inks. The image element to be formed is A first image is formed by arranging the images in the image elements forming the image, and the second printed layer is formed by arranging a plurality of image lines having bulges with transparent ink in the first direction. A second image is formed which includes a plurality of information portions and a background portion adjacent to the information portion and arranged in a second direction different from the first direction, and diffuse reflected light is applied to the substrate. The first image is in the dominant observation angle region, the second image is in the observation angle region where diffuse reflection light and specular reflection light are mixed, and the third image is in light in a specific wavelength region. It is an information carrier capable of determining authenticity, characterized in that each is visually recognized.

  Also, the information carrier capable of determining authenticity of the present invention is characterized in that the image element area ratio for forming the third image is the same as or smaller than the lowest image element area ratio for forming the first image. .

  Further, the information carrier of the present invention capable of authenticating authenticity has an integral value of the spectral reflection spectrum of the first Metamek ink between 640 and 700 nm, and the spectral reflection spectrum of the second Metamek ink between 640 and 700 nm. The integral value of the spectral reflection spectrum between 400 and 600 nm of the first metamech ink is equal to the integral value of the spectral reflection spectrum between 400 and 600 nm of the second metameric ink. It is characterized by being substantially identical.

  Further, the first printed layer in the information carrier capable of authenticating authenticity of the present invention has an image element area ratio in the range of 50 to 100%, and the image element area ratio of the information portion and the background portion of the first image. The difference is formed in a range of 10 to 40%.

  Also, the information carrier capable of determining authenticity of the present invention is such that each image element area ratio of the information portion and the background portion of the first image is equal to the image element area ratio of the third image at the same location and the image of the pair image. It is equal to the sum of the element area ratios.

  In addition, the information carrier capable of determining authenticity of the present invention is characterized in that a difference in angle between the first direction and the second direction is 5 to 90 °.

  The information carrier capable of authenticating authenticity according to the present invention is characterized in that the pitch and line width of the image line forming the second printed layer are 0.06 to 1 mm.

  In addition, the information carrier capable of determining authenticity according to the present invention is characterized in that the height of the rising of the image line by the transparent ink forming the second printed layer is 3 to 150 μm.

  The information carrier capable of determining authenticity of the present invention is characterized in that the image element forming the third image is composed of any one or a combination of halftone dots, image lines, pixels, symbols and characters. To do.

  Further, in the information carrier capable of determining authenticity of the present invention, the image element forming the pair image is composed of a halftone dot, an image line, a pixel, a symbol, a character or a solid pattern. It is characterized in that the shape of the image element forming the shape is removed.

  Further, in the information carrier capable of determining authenticity of the present invention, the information portion of the second image has a plurality of symbols arranged in the print region, and forms at least two symbols of the plurality of symbols arranged. The first direction in which the image lines are arranged is different within a range of 5 to 90 °, which is a difference from the second direction in which the image lines forming the background portion are arranged. .

  The present invention provides a first image in an observation angle region where diffuse light is dominant, a second image in an observation angle region in which diffuse reflection light and regular reflection light are mixed, and light in a specific wavelength region. Since the third image is visually recognized independently, the three different images can be visually recognized under different observation conditions.

  Since the present invention is formed by a printing method having a bulge and an ink having color flip-flop properties, the second image as a latent image is positive to negative in an observation angle region where diffuse reflection light and regular reflection light are mixed. Or from negative to positive with a vivid hue change.

  The present invention can be manufactured only by forming two layers of the first print layer and the second print layer, although the three images are switched, and the first print layer and the second print layer. The layer does not require precise imprinting, and it is possible to exert its effects simply by having a printing area in which the first printing layer and the second printing layer overlap. Very good.

  Furthermore, according to the present invention, the first image visually recognized under diffuse reflection light does not need to be a light (light) image with high brightness, and can be formed with a low (dark) light image. In addition, it is possible to maintain a high visibility of the first image while having a wide range of image shading and a degree of freedom in density design.

It is a figure which shows the front view and side view of an information carrier in embodiment of this invention. It is a figure which shows the 1st image and 3rd image in embodiment of this invention. It is a figure which shows the pair image in embodiment of this invention. It is a figure which shows the example of the image element for fitting a 3rd image and a pair image. It is a figure which shows an example of the optical characteristic of the metameric pair ink used for this invention. It is a figure which shows the 2nd image in embodiment of this invention. It is a figure which shows the printing order of the base material, the 3rd image, the pair image, and the 2nd image in embodiment of this invention. It is a figure which shows three observation areas by the positional relationship of an information carrier, a light source, and an observer's viewpoint. It is a figure which shows the image observed in the observation angle area | region where diffuse reflected light is dominant. It is a figure which shows the image observed in the observation angle area | region where diffuse reflection light and regular reflection light are mixed. It is a figure which shows the image visually recognized when it observes through the filter which permeate | transmits only the specific light of visible light. 1 is a diagram illustrating an information carrier in Example 1. FIG. 6 is a diagram illustrating an image of a third image in Embodiment 1. FIG. 6 is a diagram illustrating a pair image in Example 1. FIG. FIG. 3 is a diagram illustrating a first image in the first embodiment. 6 is a diagram illustrating a second image in Embodiment 1. FIG. In Example 1, it is a figure which shows the image observed in the observation angle area | region where diffuse reflection light is dominant. In Example 1, it is a figure which shows the image observed in the observation angle area | region where diffuse reflection light and regular reflection light are mixed. In Example 1, it is a figure which shows the image visually recognized when it observes through the filter which permeate | transmits only the specific light of visible light. 6 is a diagram illustrating an information carrier in Example 2. FIG. FIG. 10 is a diagram illustrating an image of a third image in the second embodiment. FIG. 10 is a diagram showing a pair image in Example 2. 10 is a diagram illustrating a first image in Embodiment 2. FIG. 10 is a diagram illustrating a second image in Embodiment 2. FIG. In Example 2, it is a figure which shows the image observed in the observation angle area | region where diffuse reflection light is dominant. In Example 2, it is a figure which shows the image observed in the observation angle area | region where a diffuse reflection light and a regular reflection light are mixed. In Example 2, it is a figure which shows the image visually recognized when it observes through the filter which permeate | transmits only the specific light of visible light.

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

  1 to 11, the basic image line structure of the information carrier of the present invention, the principle that the first image and the second image due to the difference in the observation angle are switched and visually recognized, and the visible The principle of the third image that is visually recognized only with light of a specific wavelength of light will be described.

  First, the basic image line structure and layer structure of the information carrier of the present invention will be described. FIG. 1A is a view showing an information carrier (1) of the present invention, which has a printing region (3) on a base material (2), and the printing region (3) includes two parts to be described later. A first print layer (4) having one image and a second print layer (5) formed by a plurality of image lines having bulges are formed so as to overlap each other. As shown in FIG. 1B, the relationship between the first print layer (4) and the second print layer (5) is that the second print layer (4) is formed on the first print layer (4). 5) is formed.

  Here, the configuration of the first print layer (4) will be described. The first printed layer (4) has an alphabet letter “A” in the first image (6) shown in FIG. 2A and an alphabet letter “A” in the third image (7) shown in FIG. C ". The first image (6) includes an information part (8) and a background part (9), and the third image (7) also includes an information part (10) and a background part (11). In addition, this 1st printing layer is formed in the range whose image element area ratio is 50 to 100%. The information part (8, 10) and the background part (9, 11) of each image are divided according to the difference in image element area ratio. However, the background portion (11) of the third image (7) surrounds “C” which is the information portion (10) of the third image (7) as shown in FIG. It seems to exist because it has a hexagonal frame, but this hexagonal frame is only shown to clarify the positional relationship with other elements, and actually Therefore, the background part of the third image (7) is a part of the background part (9) of the first image (6) and one part of the information part (8) as shown in FIG. Shared with the department.

  As described above, the first image (6) in the present invention is divided into the information part (8) and the background part (9) based on the difference in the image element area ratio. The ratio of a plurality of arranged image elements (13) (details of the image elements will be described later) occupying a certain area of the print area (3).

  Further, for the first image (6) in the present invention, in order to distinguish the information portion (8) and the background portion (9), a ratio of a plurality of image elements in a certain area, so-called image element area ratio The difference between the information part (8) and the background part (9) must be 10 to 40%. When the difference in the image element area ratio is less than 10%, there is no difference in shading between the information part (8) and the background part (9), and in the observation angle region where the diffuse reflected light is dominant, the first It becomes difficult to visually recognize the image (6). Further, when the difference in the image element area ratio is larger than 40%, it becomes difficult to visually recognize the second image (14) described later in the observation angle region where the diffuse reflection light and the regular reflection light are mixed. End up.

  In the information carrier (1) of the present invention, the first image (6) is an image that is visually recognized in a predetermined observation region under visible light (this observation region will be described later). Since the third image (7) can be visually recognized when the image (6) is observed in a specific wavelength region, the first image (6) shown in FIG. Has a configuration in which a third image (7) is embedded.

  As shown in FIG. 3, the first printed layer (4) is different from the first image (6) shown in FIG. 2 (a) with respect to the third image (7) shown in FIG. ) In a shape (hereinafter referred to as “pair image (12)”), the third image (7) of FIG.

  The third image (7) constituting the first print layer (4) is an image element (13) such as a halftone dot, image line, pixel, symbol or character, and the pair image (12) is a halftone dot. The image element (13) such as a solid pattern having a shape in which the image line, pixel, symbol, character, or image element of the third image (13) is cut out. Therefore, an example of each image element (13) for forming the first image (6) by fitting the third image (7) and the pair image (12), an example of image line and halftone dot configuration. With reference to FIG.

  FIG. 4A is a diagram in which the image elements (13) constituting the third image (7), the pair image (12), and the first image (6) are all formed by lines. An image of the pair image (12) shown in (b) of FIG. 4 (a) by tapping the image element (13-1) of the third image (7) shown in (a) of 4 (a). When fitted to the blank area of the element (13-2), the image element (13-3) of the first image (6) shown in (c) of FIG. In FIG. 4A, (c), the image element of the third image (7) is described in order to explain the state in which the image element (13-1) of the third image (7) is fitted. Although the blank area in (13-1) is indicated by diagonal lines, in practice, as shown in (d) of FIG. 4A, the image element of the third image (7) is visible under visible light. (13-1) cannot be distinguished in the image element (13-3) of the first image (6).

  Therefore, in the first printed layer (4), the region where the third image (7) is not formed is the image element (1) of the first image (6) shown in (d) of FIG. 13-3), the region where the third image (7) is formed is the image element (13-1) of the third image (6) is the image element of the pair image (12). (13-2) is constituted by the image elements shown in (c) of FIG. 4A which are image elements fitted to each other.

  Similarly, FIG. 4B is a diagram in which the image elements (13) constituting the third image (7), the pair image (12), and the first image (6) are all formed by halftone dots. When the image element (13-1) of the third image (7) is fitted to the image element (13-2) of the pair image (12) by hair removal, the image element of the first image (6) ( 13-3).

  Further, in FIG. 4C, the image element (13-1) constituting the third image (7) is a halftone dot, and the image element (13-1) of the third image (7) is a solid pattern. The shape that forms the hollowed out shape is set as the image element (13-2) of the pair image (12), and the third image (7) is formed in the blank area in the image element (13-2) of the pair image (12). When the image element (13-1) is fitted, the image element (13-3) of the first image (6) is obtained.

  Accordingly, since the image element of the third image (7) is fitted into the image element of the pair image (12) by hair removal, the image element of the pair image (12) includes FIG. As shown in FIG. 5, the blank area has a shape equal to the shape of the image element of the third image (7).

  FIG. 4 is an example for explaining the relationship between the first image (6), the third image (7), and the pair image (12) constituting the first print layer (4). The image elements (13) constituting the third image (7) and the pair image (12) can be formed by halftone dots, image lines, pixels, symbols, characters or the like as described above. However, when the image element (13) is formed by a symbol or a character, the image element (13-1) of the third image (7) is different from a simple shape such as an image line or a halftone dot. It becomes difficult to fit the image element (13-2) in (12) and print it by tapping.

  As described above, the configuration of each image of the present invention is not limited to the configuration of the image element (13) in the three examples, but the third image (7), the pair image (12), Any image element (13) can be used as long as the first image (6) can be formed by tapping. For example, in a plurality of image elements of the third image (7), image elements (13) having different shapes may be arranged. However, as described above, the image element (13) of the third image (7) must be able to be fitted to the image element (13) of the pair image (12) by tweezers. The blank area arranged in the image element (13) of the third image (7) and the image element (13) of the pair image (12) must be the same size and shape.

  In addition, the basis of these configurations is that the image element (13-1) of the third image (7) is fitted inside the image element (13-2) of the first image (6). Since it is a configuration that is visually concealed, the image element area ratio in the third image (7) does not exceed at least the lowest image element area ratio of the first image (6) at the same location. There is a need. Regarding the lowest image element area ratio, when the first image (6) is a gradation image, the image element area ratio has a range in the image element area ratio in accordance with the gradation. This is the lowest image element area ratio among the image element area ratios within the range.

Here, the image element area ratios of the first image (6), the third image (7), and the pair image (12) constituting the first print layer (4) described above will be described with reference to FIGS. This will be described in detail.
First, since the first print layer (4) is formed of the image element (13) of the third image (7) and the image element of the pair image (12), the first print layer (4) The image element area ratio, that is, the image element area ratio of the first image is the sum of the image element area ratio of the third image (7) and the image element area ratio of the pair image (12). This is because, for example, the image element area ratio at the location of the information part (8) of the first image (6) corresponding to the circled (V) by the dotted line in FIG. The image element area ratio of (V ′) corresponding to the same part of the image element of the third image (7) and the image of (V ″) corresponding to the same part of the image element of the pair image (12) of FIG. This is the sum of the element area ratios and has a relationship of (V) = (V ′) + (V ″).

  The part (V) of the first image (6) corresponds to the information part (8) in the first image (6), but the third image (7) corresponding to this part. The portion (V ′) of FIG. 2 is a region where the image element area ratio is 0, where no image elements are actually arranged. Therefore, the image element area ratio of the pair image (12) (V ″) The image element area ratio of (V) of one image is equal, and similarly, the position (X) of the first image (6) is the background portion (9) in the first image (6). In the third image (7) (X ′) corresponding to this part, no image element is actually arranged, so-called image element area ratio is 0. Therefore, the image element area ratio of (X ″) of the pair image (12) is equal to the image element area ratio of (X) of the first image, and (X) = X '= 0) + (X a relationship of "), so-called (X) = (X").

  Further, the location (Y) in the first image (6) corresponds to the information part (8) in the first image (6). There is an information part (10) that is the location (Y ′) of the image (7) of the image, and in addition, an image element in which the image element of the third image (7) is arranged by tweezers is paired. Present in image (12) (see FIG. 3). Therefore, the image element area ratio at the location (Y) of the first image (6) is the sum of the image element area ratio of the third image (6) and the image element area ratio of the pair image (12). , (Y) = (Y ′) + (Y ″).

  Similarly, the location (Z) in the first image (6) corresponds to the background portion (9) in the first image (6), but this location (Z) There is an information part (10) that is a location of (Z ′) of the third image (7), and an image element in which the image element of the third image (7) is arranged by tweezers is also present. Present in the pair image (12) (see FIG. 3). Therefore, the image element area ratio at the location (Z) of the first image (6) is the sum of the image element area ratio of the third image (6) and the image element area ratio of the pair image (12). , (Z) = (Z ′) + (Z ″).

  Next, printing the image element (13-1) constituting the third image (7) by fitting it to the image element (13-2) constituting the pair image (12) This is because the embedded image (7) is embedded in the first image (6), and the embedded third image (7) is, as shown in FIG. Since the image (7) is not visible, simply align the image element (13-1) of the third image (7) with the image element (13-2) of the pair image (12). It is not good, and there is a need for the image elements (13) to have the same color.

  Furthermore, the third image (7) needs to be visible only in a specific wavelength region. Therefore, the image element (13-1) of the third image (7) and the image element (13-2) of the pair image (12) have the same color and further have a relationship between metameric pairs having different characteristics. It forms using the 1st metameric ink and 2nd metameric ink which have. Here, the metameric pair ink will be described.

  The spectral reflectances of the first metameric ink and the second metameric ink are approximated in the range of the first wavelength in the visible region, and have different values in the range of the second wavelength in the visible region. In other words, the integral value of the spectral reflection spectrum between 640 and 700 nm of the first metameric ink has more than twice the integral value of the spectral reflection spectrum between 640 and 700 nm of the second metameric ink. It is preferable that the integral value of the spectral reflection spectrum between 400 and 600 nm of the metameric ink is substantially the same as the integral value of the spectral reflection spectrum between 400 and 600 nm of the second metameric ink.

  FIG. 5 is an example of a spectral reflectance curve of the first and second metameric inks that are the metameric pair inks used in the present invention. In the example of FIG. 5, the spectral reflectance relationship between the first metameric ink and the second metameric ink is designed to produce a spectral reflectance difference of 30% or more between 640 and 700 nm, and between 400 and 600 nm. The first metameric ink and the second metameric ink are produced with a design that produces a spectral reflectance difference of 20% or less.

  As shown in FIG. 5, there is a more noticeable difference in spectral reflectance at 660 nm or more. When a sharp cut filter or the like that transmits light of 660 to 700 nm is used, the amount of light transmitted through the indoor light source is insufficient. Thus, no matter how excellent the reflection and absorption characteristics of the ink are, the image itself will darken and become almost impossible to visually recognize, so a strong light source is often required. Accordingly, a metameric pair ink that causes a difference of about twice or more at 640 nm to 700 nm is used as a wavelength range in which different colors can be visually recognized. By using this metameric pair ink, it looks the same color at all visible wavelengths from 400 to 700 nm, but the color looks different when observed at a specific wavelength transmitted by a predetermined filter, Only one of them will appear dark.

  Hereinafter, in the present embodiment, the first metameric ink is referred to as metameric ink A, and the second metameric ink is referred to as metameric ink B, and a metameric pair ink that is a combination of the two inks will be described. . This metameric pair ink looks the same color from 400 nm to 700 nm, and the metameric ink A appears light, and the metameric ink B is dark with a cut filter (FUJI FILM Sharp Cut Filter SC64) that transmits light from 640 nm to 700 nm. Has visible properties.

  In the present embodiment, the image element (13-2) of the pair image (12) is printed with the metameric ink A, and the image element (13-1) of the third image (7) is printed with the metameric ink B. On the contrary, the image element (13-1) of the third image (7) is printed with the metameric ink A, and the image element (13-2) of the pair image (12) is printed with the metameric ink B. May be.

Next, the configuration of the second print layer (5) will be described. FIG. 6 shows the second print layer (5) formed on the first print layer (4), and surrounds the information portion (15) indicating the alphabet “B” and the surroundings. It consists of a hexagonal background (16). The information portion (15) indicating the alphabet “B” has a plurality of lines drawn in the first direction (S ₁ ), and the hexagonal background portion (16) surrounding the information portion (15) A plurality of image lines are arranged in a _second direction (S ₂ ) different from the direction (S ₁ ). An image obtained by combining the information portion (15) and the background portion (16) is referred to as a second image (14: the same as the second print layer). In the present embodiment, the first direction (S ₁ ) is a direction perpendicular to the base of the base material, and the arranged image lines indicate a so-called lateral direction, The second direction (S ₂ ) is a horizontal direction with respect to the base of the base material, and the arranged image lines indicate a state drawn in a so-called vertical direction.

The arrangement direction of the image lines of the information part (15) and the background part (16) constituting the second print layer (5) shown in FIG. 6 is a combination of the vertical direction and the horizontal direction. The first direction (S ₁ ) and the second direction (S ₂ ) may be different from each other by 5 to 90 °. Note that the different angle of 90 ° or more with respect to the first direction is also a range of 5 to 90 ° when the starting point of the first direction is considered on the opposite side, and with respect to the so-called first direction. And an angle of ± 5 to 90 °. Therefore, the difference between the first direction (S ₁ ) and the second direction (S ₂ ) in the present invention is generally 5 to 90 °. If the angle of the second direction (S ₂ ) with respect to the _first direction (S ₁ ) is smaller than 5 °, the second image (14) will not be visible. Preferably, it has a difference of 90 ° between the horizontal direction and the vertical direction.

  Furthermore, the second print layer (5) in FIG. 6 has only one information section (15), but the present invention is not limited to this, and the second print layer (5) in the same second print layer (5). A plurality of information units (15) may be arranged. The arrangement direction of the image lines constituting the plurality of information parts (15) may be all the same arrangement direction, but may be different for each different information part (15). In this case, as described above, it is only necessary to provide an angle difference of 5 to 90 ° with respect to the arrangement direction of the image lines constituting the background portion (16). By changing the arrangement direction of all the information portions (15), subtle shades of light are generated due to the difference in the image line angle with respect to the incident light, and the image can be visually recognized as rich in change.

  The image line width and pitch of each image line constituting the second print layer (5) are formed in the range of 0.06 to 1 mm. This is because it is difficult to manufacture with a thickness of 0.06 mm or less, and when it exceeds 1 mm, the resolution becomes too low and the sharpness of the second image (14) is lost. The relationship between the line widths of the lines forming the information portion (15) and the background portion (16) also differs depending on the color of the ink used.

  For example, when the second printed layer (5) is formed using a transparent ink, the line widths of the information portion (15) and the background portion (16) are not particularly related, and are 0.06 to 1 mm as described above. If it is in the range. Further, when the second printed layer (5) is formed using a translucent ink (containing a colored pigment), there is a difference in the line width between the information portion (15) and the background portion (16). The second image (14) is also observed at the viewing angle where the diffuse reflection is dominant in which the information portion (15) and the background portion (16) are shaded and only the first image (6) is originally visually recognized. It will be mixed and visually recognized. Therefore, when using a translucent ink, it is preferable that the line widths of the information portion (15) and the background portion (16) are the same.

  Further, each image line constituting the second print layer (5) is formed by a raised image line. About the height of the rising of this image line, it forms in the range of 3-150 micrometers. When formed with a swell of less than 3 μm, the second image (14) becomes invisible, and it is difficult to produce an image line with a swell higher than 150 μm.

  Furthermore, each image line of the information part (15) and the background part (16) constituting the second print layer (5) is formed of a transparent or translucent ink having color flip-flop properties. The transparent or translucent ink is hereinafter referred to as “transparent ink”.

  The color flip-flop property in the present specification is a characteristic in which the hue also changes when light is incident, unlike the light-and-dark flip-flop property that changes only when the light is incident. Examples of glittering materials having these characteristics include scaly mica pigments, scaly metal pigments, glass flake pigments, and cholesteric liquid crystal pigments. The above is the basic image structure and the layer structure of the information carrier (1) of the present invention. When an image is formed with such a configuration, the portion that strongly reflects the light in the image line changes according to the incident angle of the light. Therefore, the information unit (15) is provided by tilting the image with respect to the light. The second image (14) is observed with a negative / positive reversal by shining strongly or the background (16) shining strongly. In addition, since the image line with swell has a color flip-flop property, it becomes a negative / positive reversal effect with a hue change as well as a simple shade change.

  In the case of using a pearl pigment for the transparent ink used in the present invention, a dichroic pearl pigment, an iris pearl pigment, or other scaly pigments may be used. The particle size of the pearl pigment is selected according to the printing method to be used, but is preferably 1 to 50 μm, and the average particle size is preferably about 5 to 15 μm. As described above, any pearl pigment may be used. However, in order to improve the orientation (leafing effect) of the scaly pigment, the pigment is oriented on the surface of a 3 to 150 μm swelled line drawing. It is desirable to perform processing. Specifically, for example, by performing surface treatment such as water repellency and oil repellency treatment as described in JP-A-2001-106937, the pigment can be oriented on the surface of the image line of the printing portion. It becomes possible to make the interference color of pearl caused by reflected light appear more vividly. All the pearl pigments described in the present specification are used after being subjected to the above-described surface treatment on commercially available pigments.

  In addition, since the printing method needs to form a striated image line of 3 μm to 150 μm and to use a pearl pigment having a large particle size, flexographic printing, gravure printing, screen printing method or intaglio printing method is used. preferable. Among these, the UV drying type screen printing method is more preferable in view of the degree of freedom of the height of the image line to be formed and the tolerance of the particle size of the pearl pigment used.

  FIG. 7 shows the printing order for forming the information carrier (1) of the present invention. The third image (7) and the pair image (12) are printed on the base material (2) with the metameric pair ink. To do. In FIG. 7, the third image (7) is printed first, and then the pair image (12) is printed. However, only the third image (7) and the pair image (12) are printed. The printing order may be reversed.

  The third image (7) and the pair image (12) are completely fitted and printed with the metameric pair ink to form the first image (6) shown in FIG. Image (7) is completely invisible to the naked eye. Thereafter, the second printed layer (5) shown in FIG. 6 is formed with a raised image line using a transparent ink containing a material having a color flip-flop property, whereby the book shown in FIG. The information carrier (1) of the invention is completed.

  In describing the visual recognition principle of each image relating to the information carrier (1) of the present invention, first, the positional relationship between the information carrier (1), the light source (17), and the observer's viewpoint (18) is defined. As shown in FIG. 8, when light is incident from the light source (17) at an incident angle of 45 °, the light receiving angle of 45 °, which is opposite to the incident direction, is the region where the strongest reflection occurs. This region is an angle where specular reflection is dominant, and the region near the light receiving angle of 45 ° ± 5 is referred to as an observation angle region C in this specification, and the observation angles are 10 ° to 50 ° and 50 ° A region where 80 ° specularly reflected light and diffusely reflected light are mixed is referred to as an observation angle region B, and an angle region in which diffusely reflected light having an observation angle of −20 ° to an observation angle of 10 ° is dominant is referred to as an observation angle region A. I will call it.

  Hereinafter, the principle that the image of the information carrier (1) of the present invention is changed and visually recognized will be described. In the observation angle region A, since the diffuse reflection light is the dominant observation angle, the color difference formed by the coloring material is strongly recognized, and it is difficult to recognize the glossiness. For this reason, it is difficult to visually recognize the second image (14) formed on the second printing layer (5) formed of the transparent ink having no object color, and the printing region ( In 3), only the first image (6) formed using a metameric pair ink having a color different from that of the substrate is visible.

  In the observation angle region B, the angle of incident light inserted into the print region (3) and the angle of reflected light are close to each other, and regular reflection light and diffuse reflection light generated from the print region (3) are mixed. In such an observation angle region, the difference in the light reflectance caused by the difference in the three-dimensional structure of the object is strongly recognized, and it becomes difficult to recognize the difference in color formed by the coloring material. For this reason, the difference in the surface structure of the second printed layer (5) formed by the image line having the bulge, that is, the difference in the direction of the image line having the bulge is strongly recognized, and the second image ( Only 14) will be visually recognized.

  In addition, since the second printed layer (5) is formed of an ink having a color flip-flop property, the difference in light reflectance caused by the difference in the angle of the image line of the second image (14) is , Not only the difference in brightness of light, but also the difference in hue, which is further emphasized. Based on the above principle, the image in the print region (3) of the information carrier (1) of the present invention is changed and visually recognized from the first image (6) to the second image (14).

  FIG. 9 is an image visually recognized in the print area (3) when the observer (18) at the position of the observation angle area A observes the information carrier (1) of the present invention. Only the image (6) is visually recognized. FIGS. 10A and 10B are viewed in the print area (3) when the observer (18) in the position of the observation angle area B observes the information carrier (1) of the present invention. Only the second image (14) is visually recognized. Further, in this region, it is possible to visually recognize the negative / positive reversal effect of the image accompanied by the hue change by slightly tilting the printed matter with respect to the incident light. FIG. 10 (a) to FIG. Invert from (b) to (a).

  In the observation angle region C, strong specularly reflected light is incident so that there is almost no image in the print region (3). However, this angle region is narrow and sandwiched by the observation angle region B. Unless the observer carefully observes, it seems that the second image (14) continues to be seen.

  FIG. 11 is visible in the print region (3) when the information carrier (1) of the present invention is observed through a cut filter (FUJI FILM Sharp Cut Filter SC64) that transmits light of 640 nm to 700 nm. Only the letter “C” in the third image (7) formed with the metameric ink B is strongly visible.

  When the print area (3) of the information carrier (1) of the present invention is observed by the above principle and effect, the first image (6) is observed in the observation angle area A and the observation angle area B is observed. The second image (14) is visually recognized, and the third image (7) is visually recognized in the observation using the cut filter.

Example 1
In the following examples, the first image and the second image are switched by changing the observation angle under visible light, and in addition, the third image can be obtained by observing using a specific filter. A configuration in which an image can be visually recognized will be described with reference to FIGS. 5 and 12 to 19.

  FIG. 12 shows an information carrier (1 ′) according to the first embodiment of the present invention, which has a print region (3 ′) on the base material (2 ′), and the print region (3 ′) includes A second print layer (5 ′) formed by a plurality of image lines having bulges is formed on one print layer (4 ′) so as to overlap.

  FIG. 13 is a diagram showing a third image (7 '), which is one element of the image forming the first print layer (4'), and forms the alphabet letters "JPN". The hexagonal frame surrounding the third image (7 ′), which is the alphabetical character “JPN” in FIG. 13, is shown only for the sake of clarity of the positional relationship with other elements. Is not included in the image (7 ').

  FIG. 14 shows a pair image (12 ') which is another element of the image forming the first printed layer (4'). By fitting the pair image (12 ') and the third image (7') shown in FIG. 13, the first image (6 ') shown in FIG. 15 is formed. In practice, the image elements (13) constituting each image are fitted to each other, so that the third image (7 ′) is formed in the first print layer (4 ′). And the pair image (12 ′) are fitted together. The alphabet letters “JPN” in the third image (7 ′) in the first embodiment are formed with a dot area ratio of 45%. The image element (13) for forming the first image (6 ′) by fitting the third image (7 ′) and the pair image (12 ′) in the first embodiment is shown in FIG. ) Is used.

  FIG. 15 is a diagram showing the first print layer (4 ′) in a state in which the third image (6 ′) and the pair image (12 ′) are fitted together, and an information section that forms the characters “Japan” The first image (6 ′) is formed by (8 ′) and the hexagonal background portion (9 ′) surrounding the gradation image (representing flowing cherry blossom petals). In the first embodiment, the first printed layer (4 ') and the first image (6') are the same. The information area (8 ′) forming the first image (6 ′) has a halftone dot area ratio of 100%, and the background area (9 ′) has a halftone dot area ratio of 50 to 80%. Yes. The alphabetical character “JPN” in the third image (7 ′) in the first embodiment has a halftone dot area ratio of 45%, and the first image (6 ′) has a halftone dot area ratio of 50% or more. Therefore, by using the halftone dot fitting configuration, the alphabetical characters “JPN” in the third image (7 ′) are completely hidden in the first image (6 ′) visually. The configuration can be embedded.

  FIG. 5 shows the spectral reflection characteristics of the metameric pair ink used in Example 1. A polygonal line (19) indicates the spectral reflection characteristic of the metameric ink A, and a polygonal line (20) indicates the spectral reflection characteristic of the metameric ink B. The metameric ink A and the metameric ink B are both brown inks, and the spectral reflectances at 600 nm or more are completely different as shown in FIG. It has characteristics.

  In forming the information carrier (1 ′) of Example 1, first, the third image (7 ′) is printed on the substrate (2 ′) by the offset printing method using the metameric ink A, Next, the pair image (12 ′) is superimposed and printed using the metameric ink B, and the first image (6 ′) is formed by fitting the third image (7 ′) and the pair image (12 ′). Constitute. At this stage, the third image (7 ') is hidden in the first image (6') and becomes completely invisible.

  Subsequently, the second image (14 ') shown in FIG. 16 is formed on the first image (6') by screen pearl ink shown in Table 1 and formed by screen printing.

  The screen ink shown in Table 1 is an ink using an iris pearl pigment as a material having a color flip-flop property, and this ink is transparent in diffuse reflection and produces a gold interference color when specularly reflected. It is. In Example 1, since the second image (14 ') is formed by UV screen printing, the height of the image line is 12 μm. However, the height of the image line is not limited to this, and if the image line height is 3 μm or more, the image of the first image (6 ′) and the second image (14 ′) formed by the present invention. It is possible to exhibit the change effect of the second image and the negative / positive inversion effect of the second image (14 ′).

The second image (14 ′) formed on the second printed layer (5 ′) shown in FIG. 16 has a plurality of information portions (15 ′) representing cherry blossom petals and a hexagonal background portion surrounding the information portions (15 ′). (16 ′), and the image line angles of the information portion (15 ′) and the background portion (16 ′) need to be different. In Example 1, a plurality of image lines forming the information part (15 ′) are arranged in a direction perpendicular to the base of the substrate, which is the _first direction (S ₁ ), and the background part (16 ′) is arranged. A plurality of image lines to be formed are arranged in a horizontal direction with respect to the base of the base material, which is the second direction (S ₂ ), and are composed of image lines in which the respective image lines are orthogonal to each other. The visibility of the second image (14 ′) becomes the highest when the arrangement angle of the image lines of the information portion (15 ′) and the background portion (16 ′) is orthogonal (angle difference of 90 degrees). However, as described above, the present invention is not limited to this, and the second image (14 ′) can be viewed with an angle difference of 5 degrees or more, and there may be an angle difference of 15 degrees or more. preferable. The information part (15 ′) and the background part (16 ′) were each composed of an image line having a pitch of 0.4 mm and an image line width of 0.3 mm.

  As a result of observing the information carrier (1 ′) of Example 1 manufactured in the above procedure in the observation angle region A, as shown in FIG. 17, only the first image (6 ′) is visually recognized, and the observation angle is As a result of observation in the region B, as shown in FIGS. 18A and 18B, only the second image (14 ′) is negative-positive-inverted with a pearl effect that emits a golden interference color due to the inclination. It was confirmed that it was visually recognized.

  In the observation angle region C, the image is almost non-imaged. However, actually, the observation angle region C has a narrow angle and is sandwiched between the observation angle regions B, so that the second image (14 ′) is displayed. As a result, it was observed and observed. Therefore, in the observation under visible light, the first image (6 ′) and the second image are changed by changing the observation angle of the information carrier (1 ′) of the first embodiment with respect to the incident light. It was confirmed that (14 ') was switched and visually recognized.

  Further, when this information carrier (1 ′) was observed through a filter (sharp cut filter SC64 manufactured by FUJI FILM) that transmits only light in a specific wavelength region of visible light, as shown in FIG. It was confirmed that the image (7 ′) was visually recognized.

  As described above, in the observation under visible light, the first image (6 ′) and the first image having rich gradation by changing the angle of the information carrier (1 ′) of the present invention with respect to the incident light. The second image (14 ′) can be confirmed to be visually recognized by switching, and the third image (7 ′) can be visually confirmed when observed using a filter that transmits only light in a specific wavelength range. It could be confirmed.

(Example 2)
In the following embodiments, the first image and the second image having complex gradations are switched by changing the observation angle under visible light, and in addition, observation is performed using a specific filter. A configuration in which a third image having a complicated gradation can be visually recognized will be described with reference to FIGS. FIG. 20 shows an information carrier (1 ″) according to the second embodiment of the present invention, which has a print region (3 ″) on a base material (2 ″), and is in the print region (3 ″). Are formed on the first print layer (4 ″) so as to overlap with the second print layer (5 ″) formed by the image line group having a bulge.

  FIG. 21 is a diagram showing a third image (7 ″) which is one element of the image forming the first printed layer (4 ″), and forms a face image of a woman facing the front. Yes. The circular frame surrounding the third image (7 ″) in FIG. 21 is only shown for the sake of clarity of the positional relationship with other elements, and the actual third image (7 ″) is shown. ) Is not included.

  FIG. 22 shows a pair image (12 ″), which is another element of the image forming the first printed layer (4 ″). The pair image (12 ″) and the third image (7 ″) shown in FIG. 21 are fitted to form the first image (6 ″) shown in FIG. The face image of the woman facing the front of the third image (7 ″) in the second embodiment is formed with a dot area ratio of 0% to 45%. An image element (13) for forming the first image (6 '') by fitting the third image (7 '') and the pair image (12 '') in the second embodiment is shown in FIG. The halftone dot configuration shown in FIG. 6B is used.

  FIG. 23 is a diagram showing the first printed layer (4 ″), which surrounds an information portion (8 ″) that forms a gradation image representing “the profile of a woman wearing sunglasses”. A first background image (6 ″) is formed with the circular background portion (9 ″). In Example 2, the first printed layer (4 ″) and the first image (6 ″) are the same.

  The information area (8 ′) forming the first image (6 ″) has a halftone dot area ratio of 60% to 100%, and the background part (9 ′) has a halftone dot area ratio of 50%. ing. The face image of the woman facing the front of the third image (7 ″) in Example 2 has a halftone dot area ratio of 45% or less, and the first image (6 ″) Since the halftone dot area ratio is 50% or more, the face image of the woman facing the front of the third image (7 ″) can be obtained by using the halftone dot fitting configuration. In the image (6 ″), it is possible to embed it while being completely hidden visually.

  The metameric ink pair used in the second embodiment is the same as the ink used in the first embodiment. Like the first embodiment, the metameric ink A and the metameric ink B are used. In forming the information carrier (1 ″) of Example 2, first, the third image (7 ″) is printed on the substrate (2 ″) by the offset printing method using the metameric ink A. Next, the pair image (12 ″) is overlaid and printed using the metameric ink B, and the first image is formed by fitting the third image (7 ″) and the pair image (12 ″). (6 ″) is configured. At this stage, the third image (7 ") is hidden in the first image (6") and becomes completely invisible.

  Subsequently, a second image (14 ″) shown in FIG. 24 is formed on the first image (6 ″) by screen printing using the pearl ink for screen shown in Table 2 and formed by screen printing.

  The screen ink shown in Table 2 is an ink using an iris pearl pigment as a material having a color flip-flop property. This ink is transparent in diffuse reflection, and produces an interference color of red when specularly reflected. is there. In Example 2, since the second image (14 ″) is formed by UV screen printing, the height of the image line is 12 μm.

The second image (12 ″) shown in FIG. 24 is an information part (15 ″ -1, 15 ″ -2, 15 ″ -3, which represents the letters of the alphabet of “Genuine” and three stars. 15 ″ -4,) and a circular background portion (16 ″) surrounding it. In the second embodiment, the information section has a plurality of symbols arranged, and is configured by partially changing the line angle, and the alphabet character “Genuine” (15 ″) which is one of the symbols. -1) is formed by arranging a plurality of image lines in a direction horizontal to the base of the substrate, which is the first direction (S ₁ ), and the star 1 (15 ″ -2) of the other symbol is , Formed by arranging the image lines inclined at an angle of 30 ° from the first direction (S ₁ ), and the star 2 (15 ″ -3) of the other pattern is formed from the first direction (S ₁ ). It is formed by arranging the angled lines inclined at 45 °, and the star 3 (15 ″ -4) of the other pattern is inclined at −30 ° from the first direction (S ₁ ). Further, the background portion (16 ″) is formed by arranging a plurality of image lines in a _second direction (S ₂ ) which is a direction perpendicular to the base of the substrate. The information portion (15 ″ -1, 15 ″ -2, 15 ″ -3, 15 ″ -4,) and the background portion (16 ″) having a plurality of symbols are both pitch 0.3 mm and It was composed of an image line having an image line width of 0.2 mm.

  In addition, about the 1st direction and 2nd direction in this invention, as above-mentioned, since the 2nd direction should just have a direction difference of 5-90 degrees with respect to the 1st direction, As for the plurality of information portions (15 ″) in the second embodiment, the arrangement directions of the image lines of the individual information portions (15 ″) are all different, but all have the background portion (16 ″). It is arranged with a direction difference of 5 to 90 ° with respect to the arrangement direction of the formed image lines.

In the second embodiment, the image line forming the background portion (16 ″) is defined as the second direction (S ₂ ). The second direction (S ₂ ) and the information portion (15 Since the image line forming '') is the first direction (S ₁ ), the arrangement direction of the image lines of the information unit (15 '') arranged in plurality is the information unit (15 ''- 1, 15 ″ -2, 15 ″ -3, 15 ″ -4)) are also arranged in different directions, but the image lines are arranged in a direction different from the second direction (S ₂ ). Since the image is made to appear by arranging, each of these information portions (15 ″ -1, 15 ″ -2, 15 ″ -3, 15 ″ -4,) is formed. The arrangement direction of the image lines is all the first direction (S ₁ ).

Therefore, in the present invention, when expressing the second image as a pearl image rich in change, a plurality of information portions of the second image are arranged, and at least two of the plurality of arranged information portions are arranged. The so-called first direction (S ₁ ) of the image line constituting the information part is set to 5 to 90 ° with respect to the _second direction (S ₂ ) in which the image line constituting the background part is arranged. It may be arranged differently within the range of. In this case, all the first directions (S ₁ ) of the plurality of information units arranged may be different from each other.

  As a result of observing the information carrier (1 ″) of Example 2 manufactured in the above procedure in the observation angle region A, as shown in FIG. 25, only the first image (6 ″) is visually recognized. As a result of observation in the observation angle region B, as shown in FIGS. 26 (a) and (b), only the second image (14 ″) is negative-positive inverted with a pearl effect that emits a red interference color due to its inclination. It was confirmed that it was visually recognized. The second image (14 ″) is an information part (15 ″ -1, 15 ″ -2, 15 ″ -3, 15 ″ − representing the letters of the alphabet “Genuine” and three stars. 4)) Since the angle of each line is different, a subtle shade of light is generated due to the difference in the line angle with respect to the incident light, and it is visually recognized as a pearl image that is more varied. It was.

  In the observation angle region C, the image is almost non-imaged. However, since the observation angle region C is actually narrow and sandwiched between the observation angle regions B, the second image (14 ″). Was observed and observed. Therefore, in the observation under visible light, the first image (6 ″) and the second image (14) are changed by changing the observation angle of the information carrier (1 ″) of the present invention with respect to the incident light. '') Was confirmed to be visible by switching.

  Further, when this information carrier (1 ″) was observed through a filter (sharp cut filter SC64 manufactured by FUJI FILM) that transmits only light in a specific wavelength region of visible light, as shown in FIG. It was confirmed that the third image (7 ″) was visually recognized.

  As described above, in the observation under visible light, the first image (6 ′ having a rich gradation by changing the angle of the information carrier (1 ″) of the second embodiment with respect to the incident light. ') And the second image (14 ") can be confirmed to be visually recognized by switching, and when observed using a filter that transmits only light in a specific wavelength range, It was confirmed that the third image (7 ″) was visible.

1, 1 ′, 1 ″ information carrier 2, 2 ′, 2 ″ base material 3, 3 ′, 3 ″ printing area 4, 4 ′, 4 ″ first printing layer 5, 5 ′, 5 '' Second print layer 6, 6 ', 6''First image 7, 7', 7 '' Second image 8, 8 ', 8''First image information section 9, 9' , 9 ″ background portion 10, 10 ′ of the first image, 10 ″ third image information portion 11, 11 ′, 11 ″ third image background portion 12, 12 ′, 12 ″ pair Image 13 Image element 14, 14 ′, 14 ″ Second image 15, 15 ′, 15 ″ Second image information portion 16, 16 ′, 16 ″ Second image background portion 17 Light source 18 Observation Viewpoint 19 of the user Spectral reflectivity 20 of the metameric ink B Spectral reflectivity A of the metameric ink A Observation angle region B in which diffuse reflection light is dominant Observation angle region C in which diffuse reflection light and regular reflection light are mixed Regular reflection light Dominant observation angle region

Claims (12)

An information carrier that has a print area in at least a part of a substrate, has three images in the print area, and that can be visually recognized by making the three images visible by changing observation conditions. And
The printing area includes a first printing layer formed of a metameric pair ink different from the color of the base material, and a transparent material containing a material having a color flip-flop property on the first printing layer. Consisting of a second printed layer formed by a curable ink,
The first print layer includes a third image formed by arranging a plurality of image elements using the first metameric ink of the metameric pair ink, and a first image of the metameric pair ink. A pair of images formed by arranging a plurality of image elements using the metameric ink of No. 2, and the image elements forming the third image are arranged in a tweezer within the image elements forming the pair images The first image is formed,
The second printed layer includes an information portion in which a plurality of image lines bulged by the transparent ink are arranged in a first direction, the information portion adjacent to the information portion, and the first direction. A second image comprising a plurality of background portions arranged in different second directions is formed;
The first image is in the observation angle region where the diffuse reflection light is dominant with respect to the substrate, the second image is in the observation angle region where the diffuse reflection light and the regular reflection light are mixed, and further, the specific wavelength. An information carrier capable of authenticating authenticity, wherein each of the third images is independently viewed in the region of light. 2. The information carrier capable of determining authenticity according to claim 1, wherein an image element area ratio for forming the third image is the same as or smaller than a minimum image element area ratio for forming the first image. . 3. The information carrier according to claim 1, wherein the first printed layer has an image element area ratio in a range of 50 to 100%. The integral value of the spectral reflection spectrum between 640 and 700 nm of the first Metamek ink has at least twice the integral value of the spectral reflection spectrum between 640 and 700 nm of the second Metamek ink. The integral value of the spectral reflection spectrum between 400 and 600 nm of one Metamek ink is substantially the same as the integral value of the spectral reflection spectrum between 400 and 600 nm of the second metameric ink. The information carrier according to any one of 1 to 3, wherein the authenticity can be determined. 5. The authenticity according to claim 1, wherein the difference between the image element area ratios of the information portion and the background portion of the first image is in a range of 10 to 40%. A discriminating information carrier. Each image element area ratio of the information part and the background part of the first image is equal to the sum of the image element area ratio of the third image and the image element area ratio of the pair image in the same place, An information carrier according to any one of claims 1 to 5, wherein authenticity can be determined. The information carrier according to claim 1, wherein a difference in angle between the first direction and the second direction is 5 to 90 °. The information carrier capable of determining authenticity according to any one of claims 1 to 7, wherein a pitch and a line width of an image line forming the second print layer are 0.06 to 1 mm. body. 9. The authenticity determination according to claim 1, wherein the height of the rising of the image line by the transparent ink forming the second printed layer is 3 to 150 μm. Information carrier. 10. The true image element according to claim 1, wherein the image element forming the third image is composed of any one or a combination of halftone dots, image lines, pixels, symbols, and characters. An information carrier capable of false identification. The image element forming the pair image is composed of halftone dots, image lines, pixels, symbols, characters, or a solid pattern, and the shape of the image element forming the third image is removed from the image element. The information carrier according to any one of claims 1 to 10, wherein the information carrier is capable of determining authenticity. The information portion of the second image has a plurality of symbols arranged in the print area, and the first direction in which image lines forming at least two symbols of the plurality of symbols arranged are arranged 12 is different from the second direction in which the image lines forming the background portion are arranged in a range of 5 to 90 °. An information carrier capable of discriminating authenticity described in the item.

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