JP6028346B2 - Luminescent printed matter - Google Patents

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matters that require anti-counterfeiting effects, the present invention is capable of observing ultraviolet rays when observable under visible light. The present invention relates to a luminescent printed matter that changes to a completely different image when irradiated.

  A so-called ultraviolet-excited illuminant typified by a phosphor, a phosphor, a phosphorescent substance, and the like has a characteristic of being excited to emit light when irradiated with ultraviolet rays. This phenomenon of light emission can be easily visually confirmed, and it is difficult to reproduce it with a copy produced by a copying machine or an output produced by a home printer, so it is a genuine product for security printed matter such as banknotes and securities. Conventionally, it has been widely used as one of the authenticity determination elements for distinguishing between counterfeits and counterfeit products.

  The superiority of illuminant printing as authenticity authentication technology used to depend on the difficulty of obtaining the material itself, where only a limited number of specialists or special printing personnel can obtain the illuminant. . However, recently, light emitters are sold at a relatively low price in general merchandise stores, etc., and even ordinary people who are not engaged in special printing can easily obtain various types of light emitters. Therefore, the value of a technique for forming a simple light-emitting image, which has only the effect of causing a light-emitting image to appear by irradiating ultraviolet rays, has been greatly reduced.

  In view of these circumstances, a more unique visual effect is realized by using a complex image structure and special functional materials instead of the conventional simple light-emitting image in which a light-emitting image simply appears when irradiated with ultraviolet rays. A light-emitting image and a method for forming the same are disclosed. An example of those techniques is shown.

  Already, the present applicant has configured the curved pattern as a continuous line where the latent image is not applied and a dividing line where the portion where the latent image is branched, and the area ratio of each part is equal, and colored fluorescent ink is used. A printed matter having a copy-preventing pattern characterized by printing, and when viewed under visible light, it is recognized as a simple curved aggregate pattern. An application has been filed for a printed matter that emits intense light (see, for example, Patent Document 1).

  In addition, the present applicant is an image display body that causes a different image to appear by using a functional image display material whose visible color changes depending on conditions, and is adjacent to one first region and the first region. A plurality of sets of one second region are arranged, and the periphery of each second region is surrounded by the plurality of first regions, and the first region constituting the first image is included in the first region. A dot region and a first background region other than the first dot region, and the second region includes a second dot region constituting the second image and a second dot region other than the second dot region. The first background region and the second background region using a functional image display material, and the first dot region includes a first color provided in the functional image display material. The image display material of the same color as And an image display body having a different image change effect between images that are different from the images that can be visually recognized (including when irradiated with ultraviolet light), that is, images that are observed when irradiated with normal light and ultraviolet light are completely uncorrelated. (For example, refer to Patent Document 2).

Japanese Patent No. 4085175 Japanese Patent No. 4844891

  Although the technique described in Patent Document 1 is formed with only one type of colored fluorescent ink, it is visually recognized as a collection of curves by constructing only a latent image with extremely fine pixels. Among the images, the latent image has an excellent feature that it emits light stronger than the surroundings. However, since the latent image is composed of fine pixels that are close to the limit of the size that can be reproduced by printing, it is difficult to control the dot gain, and the luminescent image does not produce the desired effect depending on the degree of dot gain generation. There was a problem that manufacturing difficulty was high. In addition, although the latent image appears in the set of curves due to the irradiation of ultraviolet rays, there is no effect of making the set of curves invisible, and the image itself changes from one image to a different image. There was a problem that there was no change effect and change was scarce.

  The technique described in Patent Document 2 is a technique having a so-called image change effect in which an image A is lost and an image B appears when an ultraviolet ray is irradiated if an image A is visible under normal light. Therefore, compared with the conventional technique, it has the characteristics that it is excellent in the change of the image and the visibility of the luminescent image can be kept high. However, in order to keep the image change effect high, three types of ink (one functional display material and two colored inks) are required, and in addition, three images composed of three types of inks Since the most difficult printing called so-called “tweeping”, which is completely adjacent to each other without overlapping areas, requires extremely high technology for stable and continuous production. In addition, in order to cause the image of A to disappear and the image of B to appear upon irradiation with ultraviolet rays, it was necessary to change the colors of the two regions that were non-isochromatic under visible light to the same color at the time of light emission. . In order to produce a pair of inks that have the same reflected color but have the same color at the time of light emission, specialized knowledge about the illuminant and the ink is necessary, and even if it can be produced, observing the printed matter that emits light, Due to the difference in emission color or emission intensity, the color was usually different enough to be perceived by the observer. As described above, the technique described in Patent Document 2 has a problem that the difficulty of ink production and printed matter production is extremely high.

The present invention aims to solve the above-described problems, has a low level of manufacturing difficulty, enables stable continuous manufacturing, and reflects a visible image on a luminescent image that appears during ultraviolet irradiation. no, the image observed under visible light, an image that is observed when irradiated with ultraviolet rays, characterized in that it is a no different image correlation at all, excellent luminous printed matter change image effects Involved.

The luminescent printed material of the present invention comprises a printed image of a color different from that of the substrate on at least a part of the substrate, and the printed image includes an information part and a background part,
The information section comprises the first significant information by arranging a plurality of information elements formed in the first direction at a constant pitch with the first ink that emits light of the first emission color having ultraviolet light emission ability. And
The background portion has a constant latent image element formed of the second ink that does not have ultraviolet light emission ability or has ultraviolet light emission ability that emits light in a second emission color different from the first emission color. A plurality of latent image element groups arranged in the first direction at a pitch to constitute second significant information, and a camouflage element in which a plurality of camouflage elements formed of the first ink are arranged in the first direction at a constant pitch. Consisting of elements,
The latent image element group and the camouflage element group are the same color under visible light,
Information element, latent image element and camouflage element are arranged without overlapping,
The printed image is a range in which the difference between the maximum area ratio and the minimum area ratio of the predetermined region does not exceed 50%, and the area ratio of the background portion is equal to or larger than the area ratio of the information portion,
When observed under visible light, the first significant information can be visually recognized by the difference in area ratio between the area that constitutes the first significant information and the other areas, and is observed by irradiating with ultraviolet rays. In this case, when the information element and the camouflage element emit light in the first emission color, the first significant information disappears, and the latent image element does not emit light or emits light in the second emission color. The second significant information can be visually recognized, and the image changes depending on the observation conditions.

  In addition, the luminescent printed material according to the present invention is characterized in that the information element, the latent image element, and the camouflage element are composed of any one of image lines and pixels, or a combination thereof.

  The light-emitting printed matter of the present invention has a so-called image change effect in which an image visible under visible light in a printed image changes to a different image having no correlation when irradiated with ultraviolet rays. For this reason, the visible image is not reflected in the luminescent image that appears during ultraviolet irradiation as in the prior art, and since both the visible image and the luminescent image have high visibility, the authenticity discrimination is excellent.

  In the luminescent printed matter of the present invention, the paired inks that form the printed image have at least the same hue under visible light, and need only have unequal colors when emitting light. Therefore, as the simplest method for preparing a pair ink, it is only necessary to select a color ink of a specific color and divide the ink into two, put a luminescent pigment on one side, and not put a luminescent pigment on one side. Since most of the luminescent pigments are colorless and transparent, a paired ink necessary for forming a printed image by the method as described above can be easily produced. Although the two images formed with each ink require a certain level of printing accuracy, they do not require strict hair removal as in the prior art, and can be changed without strict management of dot gain. Since the effect can be obtained, the difficulty of manufacturing is low, and stable continuous manufacturing is possible.

  The luminescent printed matter formed by the above method can be manufactured by offset printing, which is a highly productive printing method, so it has excellent cost performance, and even if the latest digital equipment is used, the luminescent image cannot be reproduced. Therefore, it is excellent in anti-counterfeiting effect.

The luminescent printed material in this invention is shown. The outline | summary of a structure of the light emission printed matter in this invention is shown. (A) shows a latent image part, (b) shows an information part. (A) shows a latent image element group, (b) shows a camouflage element group. (A) shows the image comprised with a 2nd ink, (b) shows the image comprised with a 1st ink. (A) shows the image which can be visually recognized by an observer when the luminescent printed material in the present invention is observed under visible light, and (b) can be visually recognized by the observer when the luminescent printed material in the present invention is irradiated with ultraviolet rays. Images are shown. Shows an example in which the luminescent printed material of the present invention is formed of pixels, (a) shows a background portion, and (b) shows an information portion. The example which formed the light emission printed matter of this invention with the pixel is shown, (a) shows the latent image element group of this invention, (b) shows the camouflage element group. Examples of combinations of image lines and pixels in each element are shown. The luminescent printed matter in one Example of this invention is shown. (A) shows a latent image part, (b) shows an information part. (A) shows a latent image element group, (b) shows a camouflage element group. (A) shows the image comprised with a 2nd ink, (b) shows the image comprised with a 1st ink. (A) shows an image that can be visually recognized by an observer when the luminescent printed material according to one embodiment of the present invention is observed under visible light, and (b) shows a case where the luminescent printed material according to the present invention is irradiated with ultraviolet rays. An image visible to an observer is shown. (A) shows the image which can be visually recognized by an observer when the luminescent printed material in one embodiment of the present invention is observed under visible light, and (b) shows the observer when the luminescent printed material according to the present invention is irradiated with ultraviolet rays. The image which can be visually recognized is shown, (c) shows the image which can be visually recognized when the luminescent printed material in this invention is observed with transmitted light.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

  FIG. 1 shows a luminescent printed material (1) in the present invention. The luminescent printed matter (1) is formed by forming a printed image (3) having a color different from that of the substrate on the substrate (2). The substrate (2) may be paper, plastic, metal or the like as long as the printed image (3) can be formed, and the material thereof is not limited. The printed image (3) has only to have a color different from that of the substrate other than transparent, and the size is not limited as long as it fits in the substrate (2).

  First, an outline of the configuration of the print image (3) of the present invention is shown in FIG. The printed image (3) has a background portion (4) formed at a constant density and an information portion (5) representing the first significant information, and the background portion (4) is a second significant portion. A latent image element group (6) representing information and a camouflage element group (7) which forms a pair and camouflages the latent image element group (6). The above is the outline of the configuration of the print image (3) of the present invention.

  Next, a specific configuration of each image will be described. As shown in FIG. 3, the print image (3) includes a background part (4) and an information part (5). The first significant information in the present embodiment refers to a “cloisonne” image. As shown in FIG. 3A, the background part (4) represents an image composed of a constant density with no difference in density, and one information part (5) is displayed as shown in FIG. 3B. It represents a single piece of significant information. For convenience of explanation, in the print image (3), an image representing the first significant information “cloisonne” and the letters “NPB” of the alphabet as the second significant information can be visually recognized. In observation under normal visible light, the letters “NPB” are invisible. Although the effect will be described later, the letters “NPB” are visible only when irradiated with ultraviolet rays.

  “Observation under visible light” in the present invention refers to a situation in which visible light having a wavelength of 400 nm to 700 nm is incident on the luminescent printed matter (1) and the observer observes reflected light generated from the luminescent printed matter (1). More precisely, it refers to a situation in which the observer's viewpoint is at an observation angle where diffuse reflection light is relatively larger than regular reflection light. On the other hand, “observation by irradiating ultraviolet rays” means that the luminescent printed matter (1) is irradiated with ultraviolet rays included in the wavelength band from 200 nm to 400 nm, and the observer emits light emitted from the luminescent printed matter (1). Refers to the situation being observed.

  The background portion (4) and the information portion (5), which will be described in detail later, are each formed by a plurality of elements. The elements in the present invention are defined by any one of image lines and pixels, or a combination thereof. Composed.

  In addition, the “image line” as used in the present specification refers to a print dot that is the minimum unit for forming a print image, which is continuously arranged in a specific direction at a certain distance, and is a broken line or broken line Refers to straight lines, curves and wavy lines. On the other hand, “pixel” as used in the present specification is a set of at least one printing halftone dot or printing halftone dot, and various figures such as a circle, a triangle, a polygon including a quadrangle, a star shape, or a character. And symbols and numbers.

  Hereinafter, in the present embodiment, a case will be described in which all elements forming the print image (3) are formed by image lines.

  In the background portion (4) shown in FIG. 3A, a plurality of background elements (8) having an image line width W1 are regularly arranged at a constant pitch (P1) in the first direction (S1 direction in the figure). To form a certain concentration. In addition, the information section (5) shown in FIG. 3B arranges a plurality of information elements (9) of the image line width W2 in the first direction (S1 direction in the figure) at a regular and constant pitch (P1). By doing so, an image of “cloisonne” which is the first significant information is formed. In the present embodiment, the background element (8) and the information element (9) are all described as being formed with the same width. However, it is necessary to form the line width of any element with the same width. Absent.

  The printed image (3) of the present invention has a background formed at a constant density by overlapping the area of the information part (5) with the area of the background part (4) having a constant gradation (density). A difference in density occurs in the part (4), and the image of “cloisonne” which is the first significant information represented by the information part (5) is configured to be visible in the printed image (3). At this time, the area constituting the first significant information “cloisonne” is formed of only the background element (8), and the areas other than “cloisonne” are the background element (8) and the information element (9). And is formed from. Note that the area of the information part (5) overlaps the area of the background part (4) means that the places where they are arranged overlap each other, and the background elements (8 ) And the information element (9) do not overlap. In the present invention, the line width (W1) of the background element (8) and the line width (W2) of the information element (9) may be the same line width as long as they do not overlap each other. Different line widths may be used.

  The print image (3) needs to be formed in a certain shade range. Specifically, the area ratio of the region other than “cloisonne” which is the first significant information of the print image (3) and the first significant information Thus, it is necessary to form an image in a range where the difference in area ratio of the regions constituting the “cloisonne” does not exceed 50%. If the difference between the area ratio of the area other than “cloisonne”, which is the first significant information of the printed image, and the area ratio of the area constituting “cloisonne”, which is the first significant information, exceeds 50%. The difference in density in the printed image becomes too large, and the effect that the first significant information disappears when irradiated with UV light is lost. The second significant information and the first significant information are mixed and visually recognized. Therefore, the image change effect that is a feature of the present invention cannot be obtained. Therefore, such a configuration must be avoided.

  It is desirable that the information part (5) and the background part (4) are configured in an appropriate area ratio range after satisfying the above configuration. The information part (5) is preferably configured in the area ratio range of 10% to 50%. In particular, when the area ratio of the information part (5) is lower than 10%, the visibility of the first significant information that can be visually recognized by observation under visible light is lowered, which is not desirable, and the area ratio of the information part (5) is 50%. If it exceeds 1, the first significant information is not completely lost during ultraviolet irradiation, which is not desirable. The first significant information can be easily recognized by observation under visible light, and the appropriate area ratio of the information part for erasing the first significant information when irradiated with ultraviolet rays is the hue and color of the object color of the ink used. In order to change according to the density, emission hue, emission intensity, and the like, if the ink is different, it is necessary to adjust and repair it appropriately. In addition, the area ratio of the background part (4) needs to be configured to be equal to or greater than the area ratio of the information part (5) in order to enhance the effect of erasing the first significant information during ultraviolet irradiation. As described above, the difference between the maximum area ratio and the minimum area ratio of the predetermined region of each element constituting the print image (3) is 10% or more and 50% or less, and the image change effect which is a feature of the present invention Can be effectively obtained.

  For convenience of explanation, the background element (8) is expressed by a horizontal line and the information element (9) is expressed by a vertical line in all the drawings in this specification. However, these displays are performed in order to make it easy to distinguish the configuration of each drawing line, and each actual drawing line is not formed by a horizontal line or a vertical line. Actually, the inside of each image line and the inside of the pixel are filled.

  FIG. 4 shows two element groups constituting the background portion (4). One of the two element groups is the latent image element group (6) shown in FIG. 4 (a), and the other is the camouflage element group (7) shown in FIG. 4 (b). These element groups are divided according to the difference in ink used for image formation.

  In the latent image element group (6), the latent image elements (10) having a constant image line width (W1) are regularly arranged at a pitch (P1) in the first direction (direction S1 in the drawing). The second significant information is formed. The second significant information in the present embodiment is the letter “NPB” of the alphabet.

  On the other hand, in the camouflage element group (7), the camouflage element (11) having the same line width (W1) as that of the latent image element (10) is similarly regulated at a pitch (P1) in the first direction (direction S1 in the figure). The latent image element group (6) forms a negative-positive-inverted image in the background portion (4). That is, the background element (8) described above is divided into a latent image element (10) and a camouflage element (11), and the latent image element (10) and the camouflage element (11) are in the first direction (FIG. It suffices if they are regularly arranged at a constant pitch (P1) in the middle S1 direction, and there is no problem even if the phases are different. However, in consideration of concealment, the same phase is desirable.

  The latent image element group (6) and the camouflage element group (7) are visually identical in observation under visible light, and the second significant information formed by the latent image element group (6) is visible. The camera is camouflaged by the camouflage element group (7) in the observation under light, and is hidden in the background part (4). In consideration of concealment, it is desirable that the latent image element group (6) is surrounded by the camouflage element group (7).

  FIG. 5 shows two images used to form the luminescent printed material according to the present invention, that is, an image formed with the first ink and an image formed with the second ink. FIG. 5A shows an image formed with the second ink, and only the latent image element group (6). FIG. 5B shows an image (12) formed with the first ink, which is an image in which the information part (5) and the camouflage element group (7) are combined.

  Here, the first ink and the second ink used in the present invention will be described. The first ink and the second ink need to have at least the same hue of the object color under visible light. However, in this embodiment, since the latent image element group (6) and the camouflage element group (7) have the same area ratio, the first ink and the second ink have the same color as well as the hue itself. The two inks must be visually the same color.

  When the two inks are not the same color, the latent image element group (6) and the camouflage element group (7) formed with the same area ratio do not have the same color, and the background part (4) is observed in the observation under visible light. The latent image element group (6) existing in the image cannot be completely hidden.

  In the present invention, “color” represents a color including the concept of hue, saturation, and brightness, and “hue” refers to a color aspect such as red, blue, and yellow. Yes, specifically, the intensity distribution of a specific wavelength in the visible light region (400 to 700 nm) is shown. Further, in the present invention, “equal color” means that when an observer glances at two observation objects having colors, the two observation objects are not different colors but the same color. Suppose you feel it. For example, the color difference ΔE is 6 or less. In the present invention, “the hue is the same” means that the colors of red, blue, and yellow are the same in the two colors, and the distribution of the intensity of the wavelength in the visible light region has a correlation in the two colors. is there.

  The first ink of the present invention needs to have a luminous ability that emits light when irradiated with ultraviolet rays. The form of light emission may be any of fluorescence, phosphorescence, and phosphorescence, and the emission wavelength may be in the visible region or invisible region such as the infrared region. However, in consideration of authenticity, those having an emission wavelength in the visible region are desirable. Moreover, in order to be able to visually recognize the first significant information under visible light, the first ink needs to have an object color having a color different from that of the substrate other than transparent. The object color and emission color of the first ink are not particularly limited. However, when the color density of the ink (color density of the object color) is high and the substrate is white or light, It is desirable that the object color and the emission color are complementary colors or have a relationship close to complementary colors. This is because the object color and the emission color of the first ink are complementary colors or close to the complementary colors so that the emission color is white and close to the color of the base material to enhance the first significant information disappearance effect. It is.

  The object color of the second ink must have at least the same hue as that of the first ink, and must have a light emission color different from that of the first ink or may not emit light. If the first ink emits light in red, the second ink does not emit light or needs to emit light in a color other than red. These are characteristics required to conceal the second significant information under visible light and to visualize the second significant information when irradiated with ultraviolet rays.

  In order to erase the first significant information during UV irradiation, the area ratio of the information part (5) and the density of the first ink color (object color), as well as the emission intensity of the first ink, must be balanced. Need to be designed. As one guideline, when the color is dark, it is necessary to design the ink so as to emit light strongly. When the color is made light, it is necessary to design the ink so that light is emitted weakly. Further, the area ratio of the information part (5) is designed to be as small as possible in the range of 10% to 50%, and the effect of disappearing the first significant information at the time of ultraviolet irradiation tends to be relatively high. Therefore, the ink design becomes easy. If the information section (5) is designed with a small area ratio, the ink must be designed to be slightly darker to ensure the visibility of the first significant information that can be viewed under normal observation conditions. In order to enhance the effect of erasing the first significant information at the time of irradiation, it is necessary to design the emission intensity so as to be in accordance with the color density of the ink. Since the design of ink involves these elements in a complicated manner, it is necessary to find an optimal configuration each time.

  An image (12) including the information part (5) and the camouflage element group (7) in FIG. 5 (b) is printed using the first ink having the above performance, and the second ink is used. The latent image element group (6) shown in FIG. The printing method exhibits a sufficient effect by offset printing, but may be formed by flexographic printing, gravure printing, intaglio printing, screen printing, or the like.

  The effect of the present invention will be described with reference to FIG. When the luminescent printed material (1) is observed under visible light, more specifically, when the light source (13) and the viewpoint (14a) of the observer are observed in a positional relationship as shown in FIG. The observer (14a) can visually recognize an image of “cloisonne” which is the first meaningful information forming the information part (5).

  Further, when the luminescent printed material (1) is irradiated with ultraviolet rays, more specifically, when the ultraviolet light source (15) and the viewpoint (14b) of the observer are observed in a positional relationship as shown in FIG. In the print image (3), the information part (5) and the camouflage element group (7) emit light with appropriate intensity, so that the first significant information becomes invisible, and the latent image element group (6) is formed. The letters “NPB” of the alphabet, which is the second significant information, are visible. The above is the effect of the luminescent printed material (1) of the present invention.

  Next, the principle that the images that can be visually recognized in the printed image (3) are different depending on the presence or absence of ultraviolet irradiation. In the observation under visible light, the latent image element group (6) representing the second significant information and the camouflage element group (7) paired with the latent image element group (7) are visually equivalent colors. The group (6) is hidden by the camouflage element group (7) in the background part (4) and is invisible, while the information element (9) constituting the information part (5) representing the first significant information is Since the background elements (8) constituting the background part (4) are arranged so as not to overlap with each other, a difference in density occurs in the printed image (3) due to a difference in area ratio. Therefore, the observer cannot visually recognize the second significant information and can visually recognize the image of “cloisonne” which is the first meaningful information.

  On the other hand, when irradiated with ultraviolet rays, the first ink emits light with an appropriate intensity, so that the color density of the first ink changes lightly, and the contrast between the information section (5) and the camouflage element group (7). The latent image element group (6) formed with one of the second inks emits light with a hue different from that of the first ink or does not emit light other than the latent image element group (6). This produces strong contrast with the area. Therefore, when the ultraviolet rays are irradiated, the first significant information cannot be visually recognized, and the letters “NPB” of the alphabet as the second significant information can be visually recognized.

  Based on the above principle, the images that can be visually recognized in the printed image (3) of the light-emitting printed matter (1) in the observation under normal visible light and the case of irradiation with ultraviolet rays are the second significant information from the second significant information. The effect of changing to significant information occurs.

  The pitch (P1) of each element constituting the background part (4) and the information part (5) constituting the light-emitting printed matter (1) of the present invention is 0.1 mm in consideration of print reproducibility and image resolution. To 5 mm is desirable.

  Up to this point, the information element (9), the latent image element (10), and the camouflage element (11) have been described as examples, but all the elements may be formed of pixels. As an example, FIG. 7 shows an example in which the printed image (3 ′) of the luminescent printed material of the present invention is formed entirely of pixels.

  In this case, the background part (4 ') is a background element (line element) configured by arranging a plurality of pixels having a certain pixel width (R1) and a certain pixel height (H1) in a straight line at a certain pitch (P2). 8 ′) is regularly arranged at a constant pitch (P1) in the first direction (S1 direction in the figure), and the information part (5 ′) has a constant pixel width (R2) and a constant An information element (9 ′) constituted by arranging a plurality of pixels having a pixel height (H2) in a straight line at a constant pitch (P2) has a constant pitch (P1) in the first direction (S1 direction in the figure). The background element (8 ') and the information element (9') are adjacent to each other without overlapping and forming a print image (3 '). Note that the plurality of pixels constituting the background element (8 ′) are not randomly arranged but regularly arranged as shown in the figure.

  The pixel height (H1) may be the same as or different from the pixel width (R1), and the pixel height (H2) may be the same as or different from the pixel width (R2). The “S1 direction” in the present invention means the vertical direction in the drawing when the background element (8 ′) and the information element (9 ′) are pixels, and the pixels are regularly arranged as shown in the drawing. It is in a state.

  The background portion (4 ′) includes a latent image element group (6 ′) and a camouflage element group (7 ′) shown in FIG. 8A, and the latent image element group (6 ′) is a latent image element (10 ′). ), And the camouflage element group (7 ′) is composed of camouflage elements (11 ′). Even if the pixel configuration as described above is used, the light-emitting printed matter of the present invention can be formed.

  As described above, the information element (9), the latent image element (10), and the camouflage element (11) are formed of at least one of an image line and a pixel, or a combination thereof. That is, as shown in FIG. 9A, the information element (9) and the latent image element (10) are formed by pixels, and the camouflage element (11) is formed by the image line. And pixels may be combined. Further, as shown in FIG. 9B, in the information element (9), the latent image element (10), and the camouflage element (11), an image line and a pixel may be combined with each other. Further, as shown in FIG. 9C, in the information element (9), the latent image element (10), and the camouflage element (11), the image line and the pixel may be combined in each element.

  In the present embodiment, the latent image element (10) and the camouflage element (11) are formed with the same width (W1). However, the present invention is not limited to this. The image line width, the pixel width, and the pixel height of the latent image element (10) and the camouflage element (11), that is, the area ratio of the two elements can be varied depending on the desired effect. It is also possible to configure the line width of the latent image element (10) to be twice the line width of the camouflage element. In such a case, the first ink needs to be designed with the same hue as the second ink and twice the color density. By using such a configuration, even if the area ratios are different, the latent image element group (6) and the camouflage element group (7) can be made the same color, and the light-emitting printed matter of the present invention can be formed. it can. Such a form in which the two image line widths are intentionally changed is effective when it is desired to improve the visibility of the second significant information when mainly irradiated with ultraviolet rays.

  Further, the image line width of the information element (9) is not necessarily constant. In this embodiment, since the “cloisonne” image of the first significant information represented by the information part (5) is a simple binary image, the line width of the information element (9) is set to a constant value. However, when the first significant information represented by the information unit (5) is a multi-tone image such as a human face or landscape, the value of the line width (W2) according to the density of the image. You may change and form. In other words, it is only necessary to form the image line width of the dark part thick and the line width of the light part thin. Also, the width and height of the information element (9) change if they do not overlap with the background element (6) and the area ratio of the information part (5) falls within the range of 10% to 50%. There is no problem even if you let it.

  In addition, the first ink may be a colored penetrating ink containing a penetrating component, and the form in that case will be described in Example 2.

  Hereinafter, although the Example of the luminescent printed material produced specifically according to the best form for implementing the above-mentioned invention is described in detail, this invention is not limited to this Example.

  In the first embodiment, the information element (9-1), the latent image element (10-1), and the camouflage element (11-1), which are three elements constituting the light-emitting printed matter (1-1), are respectively drawn. It is an example formed by.

  FIG. 10 shows a light-emitting printed material (1-1) in the present invention. The luminescent printed matter (1-1) is formed by forming a printed image (3-1) having a light red color on a base material (2-1). As the substrate (2-1), general white fine paper (manufactured by Nippon Paper Industries Co., Ltd.) was used.

  The print image (3-1) is composed of a background part (4-1) shown in FIG. 11 (a) and an information part (5-1) shown in FIG. 11 (b).

  In the background portion (4-1) shown in FIG. 11 (a), a plurality of background elements (8-1) having an image line width of 0.25 mm are regularly arranged in the S1 direction at a pitch of 0.40 mm and at a constant density. Formed. The area ratio of the background part (4-1) in Example 1 is about 63%.

  In addition, the information section (5-1) shown in FIG. 11 (b) has an information element (9-1) having a line width of 0.05 mm different from the background element (8-1) in the S1 direction at a pitch of 0.4 mm. An image of “cloisonne”, which is the first significant information, was formed by regularly arranging a plurality of images. The area ratio of the information part (5-1) in Example 1 is about 13%.

The background element (8-1) and the information element (9-1) are arranged adjacent to each other so as not to overlap each other, and “cloisonne” which is the first significant information in the printed image (3-1). The image was expressed by the difference in shading.

  FIG. 12 shows two element groups constituting the background portion (4-1). The two element groups are divided according to the difference in ink. One is the latent image element group (6-1) shown in FIG. 12 (a), and the other is the camouflage element group (7-1) shown in FIG. 12 (b).

  In the latent image element group (6-1), latent image elements (10-1) having a line width of 0.25 mm are regularly arranged at a pitch of 0.4 mm in the S1 direction, The letters “NPB” were formed. One camouflage element group (7-1) has a plurality of camouflage elements (11-1) having an image line width of 0.25 mm regularly arranged at a pitch of 0.4 mm in the same direction S1, and the latent image element group (6 The image was formed by inverting the latent image element group (6-1), which was paired with -1), with negative-positive reversal. That is, the background element (8-1) is classified into either a latent image element (10-1) or a camouflage element (11-1).

  FIG. 13 shows an image formed with the first ink and an image formed with the second ink. FIG. 13A shows an image formed with the second ink, and only the latent image element group (6-1). FIG. 13B shows an image (12-1) formed with the first ink, which is an image in which the information section (5-1) and the camouflage element group (7-1) are combined.

  The first ink was prepared with the formulation shown in Table 1, and the second ink was prepared with the formulation shown in Table 2. The first ink and the second ink are both light red, and when printed on the substrate with the same area ratio, they have the property of appearing to be the same color when observed under visible light. In addition, when irradiated with ultraviolet light, the fluorescent pigment contained in the first ink emits green light, and is synthesized with the red component of the object color of the ink to have a white-white light green color. This ink has the property of not emitting light.

  The latent image element group (6-1) shown in FIG. 13A is printed by the offset printing method using the second ink, and the image (12-1) shown in FIG. Using the first ink, printing was similarly performed by the offset printing method to obtain a luminescent printed material (1-1) of the present invention.

  In FIG. 14, the effect of the light emission printed matter (1-1) of this invention is shown. As shown in FIG. 14A, in normal observation under visible light, the image of “cloisonne”, which is the first significant information included in the information section (5-1), can be visually recognized in light red. As shown in (b), when the ultraviolet light is irradiated, the entire printed image (3-1) changes to a light greenish white and the “cloisonne” image disappears visually. Only the letters “NPB” of the alphabet, which is the second significant information formed by the element group (6-1), were visible without emitting light. As described above, in the luminescent printed material (1-1) of the present invention, it was possible to obtain an effect of changing to different images in observation under visible light and observation when irradiated with ultraviolet rays.

  Example 2 is an example in which a light-emitting printed matter (1-2) is formed using a colored penetrating ink having a watermark effect as well as a light-emitting ability in the first ink, and only when ultraviolet rays are irradiated. In this example, the second significant information can be visually recognized even when observed with transmitted light.

  The image line configuration in the second embodiment is the same as that shown in FIGS. 10 to 13 in the first embodiment, and the description of the image line configuration is omitted. Only the first ink and the second ink are different. The first ink and the second ink will be described below.

  The first ink in Example 2 not only has a property of emitting light by ultraviolet rays, but also includes a penetrating component having an effect of allowing a printed image to be seen through under transmitted light (observed brighter than a non-printed portion). It is a colored penetrating ink formed by slightly mixing a coloring material with penetrating ink, and has a light blue color. The second ink is a light blue ink having the same color as the first ink, and does not have light emitting ability.

  Colored penetrating ink, when printed on a substrate, can form a printed image with a color that can be clearly seen under reflected light, while the printed image is invisible under transmission light or is light enough to be hardly visible. It has characteristics that change to color. In brief, it is an ink having the effect of “the image disappears when it is faint”.

  The penetrating component in the present specification refers to a component that functions to increase the transmittance of the printing region by penetrating into the paper during printing. Specifically, the refractive index of cellulose (1. 49) Resin, wax, animal and vegetable oils, etc. These components fill the gaps between the cellulose fibers present in the paper when printed, and serve to increase light transmittance mainly by suppressing light scattering inside the paper.

  The penetrating ink referred to in the present specification is an ink containing a penetrating component, and generally refers to an ink that is sold as a watermark ink or the like. Examples of such ink include T & K TOKA's best one watermark ink, Teikoku ink Unimark, Toyo Ink SMX watermark ink, Joint ink E2 varnish, and the like. The colored penetrating ink of the present invention can also be produced using these inks.

  The first ink used in Example 2 is shown in Table 3. It was prepared by mixing a penetrating ink with a blue transparent coloring material and a fluorescent pigment that emits blue light. The second ink is shown in Table 4.

  The image (12-1) in FIG. 13B is printed by the offset printing method using the first ink, and the latent image element group (6-1) in FIG. 13A is printed using the second ink. Printing was performed by an offset printing method to obtain a luminescent printed matter (1-2).

  In FIG. 15, the effect of the light emission printed matter (1-2) of this invention is shown. As shown in FIG. 15A, in normal observation under visible light, the image of “cloisonne”, which is the first significant information represented by the information section (5-1), can be visually recognized in a light blue color. As shown in b), when the ultraviolet ray is irradiated, the entire printed image (1-2) emits blue light, and the “cloisonne” image disappears visually, which is the latent image element group (6-1). Only the letters “NPB” in the alphabet were visible without emitting light. In addition, when the light-emitting printed matter (1-2) is viewed through the transmitted light through the light as shown in FIG. 15C, the image of “cloisonne” which is the first significant information is transmitted through the light. It changes lightly and becomes invisible with almost the same contrast as the background portion (4-1). On the other hand, only the letters “NPB” of the alphabet as the latent image element group (6-1) are dark without transmitting light. By appearing, the second significant information was visible.

  As described above, in the observation under visible light and the observation when irradiated with ultraviolet rays, it was possible to obtain the effect of changing to different images, and the image observed under visible light even under transmitted light The effect of changing to a different image was obtained.

  In the form of Example 2, since the authenticity of the printed matter can be determined by simply passing the printed matter over the light, it is not necessary to use an ultraviolet lamp, and it can be said that this form is extremely convenient for everyone.

  In addition, since the effect of changing the image when the ultraviolet ray is irradiated, which is the original of the present invention, is not impaired at all, the authenticity determination can be performed by irradiating the ultraviolet ray when more strict confirmation is required. It can be said that the luminescent printed material formed in Example 2 is excellent in authenticity discrimination and high in forgery resistance.

1, 1-1, 1-2 Luminous printed matter 2, 2-1 Substrate 3, 3 ', 3-1 Print image 4, 4', 4-1 Background portion 5, 5 ', 5-1 Information portion 6, 6 ', 6-1 Latent image element group 7, 7', 7-1 Camouflage element group 8, 8 ', 8-1 Background element 9, 9', 9-1 Information element 10, 10 ', 10-1 Latent Image element 11, 11 ', 11-1 Camouflage element 12, 12-1 Image formed with first ink 13, 13-1, 13-2 Light source 14a, 14b, 14a-1, 14b-1, 14a-2 , 14b-2, 14c-2 Observer's viewpoint 15, 15-1, 15-2 UV lamp H1, H2 Pixel height P1, P2 Pitch R1, R2 Pixel width S1 First direction W1, W2 Line width

Claims (2)

At least a part of the substrate is provided with a printed image having a color different from that of the substrate.
The print image is composed of an information part and a background part,
The information section emits light with a first emission color having ultraviolet light emission ability, and information elements formed with a first ink having a complementary object color with the first emission color are first at a constant pitch. It is arranged in the direction of and constitutes the first significant information,
The background portion has no ultraviolet light emission ability, or a latent image element formed of a second ink having an ultraviolet light emission ability that emits light in a second emission color different from the first emission color. A plurality of latent image element groups arranged in the first direction at the constant pitch to constitute second significant information, and a camouflage element formed of the first ink at the first pitch at the first pitch. Composed of a plurality of camouflage elements arranged in the direction,
The latent image element group and the camouflage element group are color-matched under visible light,
The information element, the latent image element and the camouflage element are arranged without overlapping,
The printed image is a range in which the difference between the maximum area ratio and the minimum area ratio of each region does not exceed 50%, and the area ratio of the background portion is equal to or greater than the area ratio of the information portion,
When observed under visible light, the first significant information can be visually recognized by the difference in the area ratio between the region constituting the first significant information and the other regions, and irradiated with ultraviolet rays. The information element and the camouflage element emit light in the first emission color, so that the information element and the camouflage element are in accordance with the relationship between the first emission color and the complementary color of the object color. The first significant information disappears when it is visually recognized as white and disappears, and the latent image element does not emit light or emits light in the second emission color, thereby the second significant information. Is a light-emitting printed matter characterized in that the image changes depending on the observation conditions.
  The luminescent printed matter according to claim 1, wherein the information element, the latent image element, and the camouflage element are one of an image line and a pixel, or a combination thereof.

Images