JP5885164B2 - Latent image 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 matter that requires anti-counterfeiting effects, the present invention is a latent image obtained by observing the printed matter deeply. The present invention relates to a latent image printed material in which an image appears.

  Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of precious printed matter. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by a printer or a copier are required. In addition, the anti-counterfeiting technology is desired to be a technology that can be easily distinguished by anyone without requiring special tools.

  One of the technologies capable of determining authenticity is a latent image pattern formed by using the unevenness of the base material and the image line. This has the effect that the latent image appears when the printed material is tilted deeply, and the latent image is not visually recognized when facing the printed material. Such a technique capable of determining authenticity using a three-dimensional structure of a base material or image line has high forgery resistance because it cannot be counterfeited using a color copy or a printer.

  The present applicant has already applied a material having a concavo-convex shape formed by embossing various line patterns, relief patterns, or both patterns representing a pattern by partially different angles. With a different color ink other than color and colorless and transparent, any one of various line strokes, halftone dot strokes, or both strokes with a constant interval can be made a part that constitutes a part other than an uneven pattern. When viewed from the front by printing parallel or inclined, only one of various lines, halftone lines, or both lines can be confirmed and observed from an oblique direction. In some cases, the pattern formed by the concavo-convex shape can be easily confirmed by the non-constant positional relationship that occurs between the concavo-convex shape and the printed image line. Confirmation Have filed a latent image pattern formed body, characterized in that that can (see Patent Document 1).

  The applicant has already offset the various lines on the printed material with colored inks that are different from the surface color of the printed material, and then specified the basic lines using the transparent intaglio ink as the basic lines. This is an anti-counterfeit printed material that is intaglio printed so that it overlaps in parallel with various lines printed by offset printing various line relief images obtained by shifting two-dimensionally in correspondence with characters and designs of Various anti-counterfeit prints have been filed (see Patent Document 2), in which various lines printed by offset printing can be confirmed by observing, and various line relief images can be observed by observing the printed material at an angle.

Japanese Patent No. 2615401 Japanese Patent No. 3686953

  The techniques described in Patent Document 1 and Patent Document 2 are configured to superimpose an image line that is raised on an image line printed on the surface of the base material, or to overlay an image line on a structure that is raised. Both of these are technologies that have the effect of allowing the latent image to be visually recognized by observing the printed material at an angle. One of the features of these technologies is that a latent image that can be viewed by tilting is a positive image when observed from a certain direction, and a negative image when observed from the opposite direction. There is an inversion effect. The negative / positive reversal effect caused by changing the observation direction is an effect that cannot be easily reproduced without using the three-dimensional structure of the base material or image line, and is one of the effects that can ensure a certain counterfeit resistance. It can be said.

  However, as shown in FIG. 24, in the techniques described in Patent Document 1 and Patent Document 2, the viewpoint in which the image is viewed as negative and the viewpoint in which the image is viewed as positive are separated by 100 ° or more due to the technical features. ing. Therefore, as the observation angle is changed from the viewpoint in which the latent image is viewed positively (or negative) to the viewpoint in which the latent image is viewed negatively (or positive), the appearing latent image itself disappears once and becomes invisible. Disappears from the observer's field of view.

  In other words, by changing the observation angle from the observation angle of the latent image that was visible with the negative, the latent image that was once visible with the negative disappears, and a large angle region where the latent image itself cannot be observed is sandwiched. Thus, a latent image that appears positively appears only after reaching a specific angle or more. The negative / positive reversal effect is a relatively large effect that completely replaces the dark and light parts of the latent image, but if the effect cannot be perceived as a continuous change, it tends not to remain in the human impression. It is in.

  For this reason, once the negative or positive latent image that was visible until then disappears, even if the observer sees the latent image that appears again after changing the observation angle, the observer can see the latent image. Although attention is paid to the phenomenon that the image reappears, it is often not noticed that a negative / positive reversal effect has occurred in the latent image.

  In the case of printed matter using a lenticular, the base material needs to be transparent, and there are many restrictions on the base material such that it cannot be formed on paper. Furthermore, the lenticular uses the lens effect to enlarge the image, and a certain distance is required between the lens and the image in order to adjust the focal length, and its thickness exceeds 100 μm. It was not suitable as a printed material distributed in Japan.

  As described above, the negative / positive reversal effect realized by the techniques described in Patent Document 1 and Patent Document 2, that is, the negative / positive reversal effect in a situation that cannot be regarded as a continuous change, has a small impact on the observer. If the observer knows that the effect is produced or has not observed it with particular care, the effect may not be noticed, and there is a problem that the authenticity discrimination function is somewhat weak. Therefore, there has been a demand for a so-called image change effect in which significant information represented by the latent image changes, which has a strong impact on the observer.

  The latent image printed material according to the present invention includes a printed image on at least a part of the substrate, and the printed image is transparent or translucent on the composite image group formed in a color different from that of the substrate. Convex image lines are stacked, and the composite image group has a plurality of first image lines arranged in the first direction at a specific pitch, and the phases of some of the first image lines are different. A first image divided into a first camouflage image line group and a first latent image line group constituting the first significant information, and arranged in a first direction at a specific pitch. A second latent image line group and a second camouflage line group that constitute the second significant information by having a plurality of second image lines and a phase of a part of the second image line being different. A first image comprising a second image divided into a first camouflage line group and The second image lines constituting the second latent image line group are arranged alternately and regularly without overlapping, and the first image line constituting the first latent image line group and the first image line The second image lines constituting the second camouflage image line group are regularly and alternately arranged without overlapping, and the convex image line group is a plurality of convex image lines formed in the first direction at a specific pitch. The first image line and the second image line are formed so as to overlap with the convex image line, so that the composite image group is visually recognized when viewed in front of each other under visible light. When observing from the first direction while tilting, either the first significant information or the second significant information is visually recognized, and the other is visually recognized when observing from the direction opposite to the first direction. It is characterized by.

  In the latent image printed material of the present invention, the first image line constituting the first camouflage image line group and the second image line constituting the second camouflage image line group overlap the convex image line, The first image line constituting the latent image line group partially overlaps the convex image line so as to straddle the non-image area between the convex image line and the convex image line. The second image line to be formed is formed by overlapping the convex image line and a part thereof so as to straddle the convex image line and the non-image line part.

  The latent image printed material according to the present invention has a total area of the first camouflage image line group, the first latent image image line group, the second latent image image line group, and the second camouflage image line group within a predetermined range. The rate is the same area rate.

  In the latent image printed material of the present invention, the first latent image line group and the first camouflage line group have the same color, and the second latent image line group and the second camouflage line group have the same color. It is characterized by being.

  The latent image printed material according to the present invention is characterized in that the phase difference between the first image line and the second image line is a quarter pitch of the first pitch.

  In the latent image printed material according to the present invention, the first image line constituting the convex image line and the first latent image line group, and the second image line constituting the convex image line and the second latent image line group are In addition, the overlap is formed with a width of one third of the line width of the convex line.

  The latent image printed matter of the present invention is a technique in which a latent image that is invisible in a state of facing up appears in a deeply inclined state, and the first significant information is obtained when observed from a first direction. When the first latent image represented is visually recognized and observed from the second direction opposite to the first direction, the second latent image representing the second significant information is visually recognized. The so-called image change effect, in which the significant information itself represented by the latent image changes, has a strong impact on the observer, and the change is dramatic compared to the negative / positive reversal effect of the conventional technology. Excellent and counterfeiting is difficult.

  Unlike the case where a lenticular is used, there is no limitation on the base material and the thickness can be reduced. Therefore, it is suitable as a printed material generally distributed.

It is a figure which shows the latent image printed matter in embodiment of this invention. It is a figure which shows the structure of the latent image printed matter in embodiment of this invention. It is a figure which shows the 1st image in embodiment of this invention. It is a figure which shows the 2nd image in embodiment of this invention. It is a figure which shows the colored image group in embodiment of this invention. It is a figure which shows the convex line group in embodiment of this invention. It is a figure which shows the overlap of the colored image group and convex image line group in embodiment of this invention. It is a figure which shows the appropriate positional relationship of each element in embodiment of this invention. It is a figure which shows the effect at the time of observing a latent image printed matter facing in the embodiment of this invention. It is explanatory drawing of the effect at the time of observing from a 1st direction deeply inclining a latent image printed matter in embodiment of this invention. It is explanatory drawing of the effect at the time of observing from a 2nd direction deeply inclining a latent image printed matter in embodiment of this invention. It is a figure which shows the principle of the effect expression of the latent image printed matter in embodiment of this invention. It is a figure which shows the effect in embodiment of this invention. The suitable range which provides the 1st latent image image line and the 2nd latent image image line of the latent image printed matter of this invention is shown. It is a figure which shows the latent image printed matter in one Example of this invention. It is a figure which shows the structure of the latent image printed matter in one Example of this invention. It is a figure which shows the colored image group in one Example of this invention. It is a figure which shows the 1st image in one Example of this invention. It is a figure which shows the 2nd image in one Example of this invention. It is a figure which shows the convex line group in one Example of this invention. It is a figure which shows the overlap of the colored image group and convex image line group in one Example of this invention. It is a figure which shows the positional relationship of each element in one Example of this invention. It is a figure which shows the effect in one Example of this invention. It is a figure which shows the trouble of the prior art.

  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 is a view showing a latent image printed matter (1) according to the present invention, and comprises a printed image (3) on a substrate (2). As the base material (2), any material may be used as long as it is a material capable of forming an image on the surface, such as fine paper, coated paper, film, metal, and the like. Moreover, there is no restriction | limiting also about the color of a base material (2), and even if it is transparent or opaque, there is no problem, and also there is no restriction | limiting in particular about a magnitude | size. The printed image (3) may have any color other than transparent as long as it has a color different from that of the substrate (2).

  FIG. 2 shows a basic conceptual diagram of the structure of the print image (3). The print image (3) is formed by stacking a composite image group (4) and a convex image line group (5). The stacking order of the composite image group (4) and the convex image line group (5) must be a stacking order in which the convex image line group (5) overlaps the composite image group (4). The reason why the order of stacking should be performed will be described in detail in the visual recognition principle described later.

  The composite image group (4) is formed with a uniform gradation with no shading, and has a first image (6) and a second image (7). Both the first image (6) and the second image (7) are formed with uniform gradations with no shading.

  The first image (6) is paired with the first latent image line group (9) representing the first significant information and the first latent image line group (9). And a first camouflage image line group (8) having a configuration in which the negative / positive of the latent image line group (9) is inverted. The first significant information represented by the first latent image line group (9) in the present embodiment is the letters “JPN” of the alphabet, and the first latent image line group (9) is in the negative state. It is represented by The first latent image line group (9) is an image that becomes a latent image visually recognized by the observer when tilted, and the first camouflage line group (8) is the first image when facing the first. The latent image line group (9) is prevented from being visualized, and the first latent image line group (9) is hidden in the composite image group (4).

  The second image (7) is paired with the second latent image line group (10) representing the second significant information and the second latent image line group (10). And a second camouflage line group (11) having a configuration in which the negative / positive of the latent image line group (10) is inverted. The second significant information represented by the second latent image line group (10) in the present embodiment is a “sakura” image, and the second latent image line group (10) is represented in a positive state. It consists of The second latent image line group (10) is an image that becomes a latent image visually recognized by an observer when tilted, and the second camouflage line group (11) The latent image line group (10) is prevented from being visualized, and the second latent image line group (10) is concealed in the composite image group (4).

  FIG. 3 shows a detailed drawing configuration diagram of the first image (6). The first image (6) is composed of a plurality of first image lines (12) having an image line width (W1) continuously arranged at a specific pitch (P1) in the first direction. The first camouflage image line group (positive and negative) representing the alphabetical characters “JPN”, which is the first significant information, by changing the phase of a part of the image line (12) (shifting the phase) ( 8) and the first latent image line group (9).

  The positive in the present invention is relatively dark significant information itself, the surrounding of one significant information refers to a relatively light state, the negative in the present invention, the significant information itself is relatively light, One signifi cant information is relatively dark.

  The phase shift in the first image line (12) is most desirably a quarter pitch of the pitch (P1) of the first image line (6). This is to keep the visibility of letters of the alphabet “JPN”, which is first significant information described later, high.

  Note that, as described above, the first image (6) included in the latent image printed material (1) described in the present embodiment is obtained by shifting a part of the phase in the first image line (12). The first camouflage line group (8) and the first latent image line group (9) are divided into the first camouflage line group (8) and the first image line (9). The line width of the first image line (9) in the first latent image line group (9) is the same.

  In addition, the first camouflage image line group (8) and the first latent image image line group (9) are images in which the shades of the positive image and the negative image are reversed, so that the areas adjacent to each other. 3, if one of the paired image lines is filled with an area ratio of 100% as in the area A indicated by the dotted line in the partially enlarged view of FIG. 3, the area ratio of the other adjacent image line is Is 0%, and if one is formed with an area ratio of 50%, the other adjacent area ratio is 50% (not shown), and if one is formed with an area ratio of 30%, The area ratio of the other side is 70% (not shown). Therefore, the total area ratio of the first camouflage image line group (8) and the first latent image image line group (9) occupying within a predetermined range is almost the same value at any location. For this reason, although each image line group includes the first significant information, the first image (6) itself is visually recognized as an image having no gradation and having a uniform gradation.

  Note that the “area ratio” in the present specification is a ratio occupied by the image line within a predetermined range. The term “within a predetermined range” as used herein refers to a range having a length of at least one pitch in the first direction and an arbitrary length in a direction orthogonal to the first direction. I will do it.

  FIG. 4 shows a detailed drawing configuration diagram of the second image (7). In the second image (7), a plurality of second image lines (14) having an image line width (W2) are continuously arranged in the first direction at the same pitch (P2) as a specific pitch (P1). The second latent image formed by positive and negative images of the “cherry blossom”, which is the second significant information, is generated when the phase of the second image line (14) is different (shifted). It is divided into an image line group (10) and a second camouflage line group (11).

  The phase shift in the second image line (14) is most preferably a quarter pitch of the pitch (P2) of the second image line (14). This is to maintain high visibility of an image of “sakura” which is second significant information described later.

  As described above, the second image (7) included in the latent image printed material (1) described in the present embodiment is obtained by shifting a part of the phase of the second image line (14). The latent image line group (10) and the second camouflage line group (11) are naturally divided, so that the second image line (14) in the second latent image line group (10) is naturally. And the second line (14) in the second camouflage line group (11) have the same line width.

  It should be noted that the line width (W1) of the first image line (12) forming the first image (6) and the second image line (14) forming the second image (7). The line width (W2) of () may be the same or different. The pitch (P1) in the first image line (12) and the pitch (P2) in the second image line (14) are the same pitch.

  Similarly to the first image (6), the second latent image line group (10) and the first camouflage line group (11) are images in which the shades of a positive image and a negative image are reversed. Therefore, in each of the adjacent areas, if one of the image lines to be paired is filled with an area ratio of 100%, as in the B area indicated by the dotted line in the partially enlarged view of FIG. The area ratio of the other adjacent line is 0%, and if one is formed with an area ratio of 50%, the area ratio of the other adjacent line is 50% (not shown), and the other is the area ratio. If it is formed at 30%, the area ratio of the other adjacent side becomes 70% (not shown). Therefore, the total area ratio of the second latent image line group (10) and the first camouflage line group (11) occupying within a predetermined range is almost the same value at any place. For this reason, although each image line group includes the second significant information, the second image (7) itself is visually recognized as an image having a uniform gradation with no shading.

  FIG. 5 shows a detailed image line configuration of the composite image group (4) composed of the first image (6) and the second image (7). The first image line (12) forming the first camouflage image line group (8), the first image line (12) forming the first latent image image line group (9), the first The second image line (14) forming the second latent image line group (10) and the second image line (14) forming the second camouflage line group (11) Are arranged alternately and do not overlap each other with a phase shift in the first direction. In this embodiment, the first image line (12) forming the first camouflage image line group (8) and the first latent image line group (9), and the second latent image image line group The second image line (14) forming (10) and the second camouflage image line group (11) is shifted in phase in the first direction by a quarter of the pitch.

  However, in this embodiment, W1 and W2 are the same, and the line width (W1) and the first line width (W1) of the first line (12) forming the first camouflage line group (8) are the same. The sum of the line widths (W1) of the first image lines (12) forming one latent image line group (9) and the second latent image line groups (10) are formed. The sum of the stroke width (W2) of the second stroke (14) and the stroke width (W2) of the second stroke (14) forming the second camouflage stroke group (11) is the pitch. This corresponds to a quarter of (P1), but is not limited to this. The line width of the first line (12) forming the first camouflage line group (8) ( W1) + image width (W1) of the first image line (12) forming the first latent image line group (9) + second latent image line group (10) Of the second line (14) The value of the line width (W2) of the second image line (14) forming the line width (W2) + the second camouflage image line group (11) is equal to or less than the pitch (P1, P2). Just do it.

  In addition, as in a region C indicated by a dotted line in the partially enlarged view of FIG. 5, a first camouflage line group (8), a first latent image line group (9), which occupy a predetermined range, The total area ratio of the second latent image line group (10) and the second camouflage line group (11) is almost the same value at any location. However, in the present embodiment, the same value has been described as 100%, but is not limited to 100%. For example, in the case of 80%, adjacent latent image elements (8) within the same pitch. This means that the sum of the area ratio and the area ratio of the camouflage element (9) is preferably approximately 80% at any location.

  Thus, the first camouflage image line group (8), the first latent image image line group (9), the second latent image image line group (10), and the second camouflage image line within a predetermined range. By setting the total area ratio of the group (11) to almost the same value in any place, the composite image group (4) which is a composite image of the first image (6) and the second image (7). However, although it includes two different significant information, it is visually recognized as an image having a uniform gradation without shading.

  The composite image group (4) having the above configuration is formed using ink having a color different from that of the base material (2). The color may be any color, and may be formed by using a metallic ink such as gold or silver, or using a glossy ink with high gloss, in addition to using a normal colored ink.

  The first image (6) and the second image (7) may be configured with the same color or different colors. While it is easy to manufacture when configured with the same color, the first latent image line group (9) and the second latent image line group (10) appearing when tilted are the same color. Limited to expression.

  On the other hand, when configured with different colors, the number of printing colors increases, and a certain printing accuracy is required between the respective colors. On the other hand, the first latent image line group (9) appearing when tilted. And the second latent image line group (10) have different colors, and a rich expression is possible. Therefore, it is desirable to use them according to the purpose to which each is important.

  When the first image (6) and the second image (7) are configured with different colors, the first latent image line group (9) and the first image line group (9) included in the first image (6) are provided. The camouflage drawing line group (10) must not be a different color. Similarly, the second latent image line group (11) and the second camouflage line group (12) included in the second image (7) must not have different colors. This is to prevent each significant information from being visualized.

  The printing method for printing the composite image group (4) may be any method such as offset printing, letterpress printing, flexographic printing, gravure printing, intaglio printing, and the like. Further, there is no problem even if it is formed using a digital printing device such as an ink jet printer or a laser printer. Further, the composite image group (4) may be formed by expressing the shade by scoring or cutting the surface of the substrate using a laser marker or various cutting machines.

  FIG. 6 shows a detailed image line configuration diagram of the convex image line group (5). The convex line group (5) is composed of a plurality of convex line lines (16) with a width (W3) having a swell continuously arranged in the first direction at a specific pitch (P1), and Between the line (16) and the convex image line (16), there is a non-image line part (17) having a width (W4). When the convex image line (16) and the non-image line part (17) are tilted, one of the two latent image line groups (9, 10) and the two camouflages are displayed. It functions to conceal the image line group (8, 11) and cause only one remaining latent image element group to appear. These specific functions will be described later.

  The convex line group (5) needs to be raised and transparent or semi-transparent. In order to enhance the effect of the present invention, a material having a high refractive index is desirable. The reason for this will be described later.

  The forming method may be formed by printing using a printing method capable of forming a bulge such as intaglio printing or screen printing. The rising height is preferably 5 μm or more and 1 mm or less, although it depends on the pitch, and it is 15 μm or more and 100 μm or less to keep the visibility and distribution suitability of the first significant information and the second significant information high. Therefore it is more desirable.

  FIG. 7 shows an overlapping order of the composite image group (4) and the convex image line group (5) for forming the latent image print (1). First, the composite image group (4) is printed on the substrate (2), and the convex image line group (5) is formed thereon by being superimposed.

  FIG. 8 shows the detailed positional relationship of the overlapping of the composite image group (4) and the convex image line group (5) in the present embodiment. FIG. 8B shows a schematic diagram of an enlarged view of a part of the print image (3) viewed from the front, and FIG. 8C shows the print image (3) shown in FIG. 8B. Sectional drawing cut | disconnected by the AA 'line is shown.

  The most desirable overlapping positional relationship between the image lines constitutes the first camouflage image line group (8) in the image line width of the convex image line (16) as shown in FIG. The first image line (12) and the second image line (14) constituting the second camouflage image line group (11) are completely included to form the first latent image image line group (9). The first image line (12) and the second image line (14) constituting the second latent image image line group (10) straddle the convex image line (16) and the non-image line part (17). The positional relationship is formed. The range of the position of the image line where the effect of the present invention can be exhibited will be described later. With the configuration as described above, the latent image printed material (1) of the present invention is formed.

  9, 10, and 11 show the effect of the latent image printed material (1), that is, an image that is visually recognized when the observation angle is changed. As shown in FIG. 9, when the latent image printed material (1) is observed from the viewpoint (18a) facing the latent image printed material (1), the composite image group (4 ) Is observed, the first significant information and the second significant information are invisible.

  On the other hand, as shown in FIG. 10A, when the latent image printed material (1) is tilted and observed from the A side toward the first direction, the first image below the convex image line (16) is obtained. A first image line (12) forming the camouflage image line group (8), a second image line (14) forming the second camouflage image line group (11), and one convex image The second image line (14) forming the second latent image image line group (10) formed across the end on the A ′ side of the line (16) and the non-image area part (17) is The first latent image line group (9) formed across the non-image line part (17) and the end on the A side in one convex image line (16) becomes invisible. Only the streak (12) is observed. Therefore, only an image in which the characters “JPN”, which is the first significant information represented by the first latent image line group (9), are represented by the negative is visually recognized by the observer.

  In addition, as shown in FIG. 11A, when the latent image printed material (1) is tilted and observed from the A ′ side toward the second direction, the first under the convex image line (16). The first image line (12) forming the camouflage image line group (8) and the second image line (14) forming the second camouflage image line group (11), and one convex The first image line (12) forming the first latent image image line group (9) formed across the edge of the A side in the image line (16) and the non-image area portion (17) is A second latent image line group (10) is formed which is invisible and extends across the end on the A ′ side of one convex image line (16) and the non-image line part (17). Only the image line (14) is observed. Therefore, only an image in which the image of “cherry blossom”, which is the second significant information represented by the second latent image line group (10), is positively viewed by the observer.

  Next, the principle that the image that can be visually recognized changes according to the observation direction as described above will be described. First, since the convex image line (16) is transparent or semi-transparent and has a property of transmitting light when observed in a face-to-face relationship, the first latent image image existing under the convex image line (16). The first image line (12) forming the line group (9), the first image line (12) forming the first camouflage image line group (8), and the second latent image image line. Since all of the second line (14) forming the group (10) and the second line (14) forming the second camouflage line group (11) are observed, Neither the significant information nor the second significant information is invisible, and as shown in FIG. 9, the composite image group (4) having uniform gradation and no shading is visually recognized.

  However, in the order of FIG. 12A to FIG. 12B and FIG. 12C, the closer the observer's viewpoint height is to the latent image print (1), that is, the latent image print (1). The more the angle is tilted, the larger the area that disappears from the observer's viewpoint among the areas existing below the convex line (16) (Ia → Ib → Id and Ie in the figure). This is because the incident angle of the light incident on the convex image line (16) increases, so that the light that can enter the convex image line (10) decreases, and the ratio of the light reflected on the surface of the convex image line (16) is reduced. This is because it increases relatively.

  Therefore, as the tilted angle increases, the transparency of the convex line (10) decreases, changes to opaque, and the image existing under the convex line (16) becomes invisible. This tendency is particularly remarkable when the refractive index of the convex line (10) is high. As described above, the convex line (10) changes to be opaque, so that the image existing under the convex line (16) becomes invisible, and in addition, beyond the convex line (16) as viewed from the observer. The region existing on the side is also physically shielded by the rise of the convex image line (16) and becomes invisible.

  As described above, most of the image existing under the convex image line (16) is invisible due to the opaque convex image line (16), but there is a region (Ic) that is not invisible in part. This invisible region (Ic) is the vicinity of the end closer to the observer among the ends of the convex line (16) in the composite image group (4) existing under the convex line (16). Hits it. In each convex image line (16), the inclined surface close to the observer swells at an angle close to perpendicular to the printed matter, so that the incident light of the incident image line (16) is incident as compared to the other surface. Since the angle is relatively small, the transparency is not greatly reduced, and even if it is reduced, the ratio is small compared to other regions.

  Therefore, only the image lines existing in the non-invisible region (Ic) among the image lines of the composite image group (4) existing under the respective convex image lines (16) are observed by the observer. When observed from the second direction opposite to the first direction, the vicinity of the other end of the convex line (16) is a region (Ic) that is not invisible.

  Based on the above principle, when the image is tilted and observed from the first direction, the image line existing in the region (Ic) that does not become invisible, that is, the first latent image image line group (9) in the present embodiment. Only the first image line (12) forming the image is visually recognized, and as a result, only the first latent image image line group (9) is visually recognized.

  On the other hand, the region (Ic) that does not become invisible when tilted and observed from the second direction is inverted across the center of the convex image line (16), so that the second latent image line group (10) Only the second image line (14) forming the image is visually recognized, and as a result, only the second latent image image line group (10) is visually recognized. According to such a principle, the first significant information is visually recognized when observed from the first direction, and the second significant information is visually recognized when observed from the second direction. A change effect occurs.

  When the latent image printed matter (1) is observed from the viewpoint (18a) facing the latent image printed matter (1) according to the principle described above, as shown in FIG. 13, the density shown in FIG. When the composite image group (4) having a uniform gradation with no image is observed and the latent image print (1) is tilted and observed from the first direction, the first latent image shown in FIG. When the image line group (9), that is, the first significant information is visually recognized and the latent printed matter (1) is tilted and observed from the second direction, the second latent image shown in FIG. The image line group (10), that is, the second significant information is visually recognized, and an effect is obtained in which different images can be visually recognized according to the observation angle.

  Thus, in order to achieve the effect of the present invention, the first image line (12) and the first camouflage image line group (8) forming the first latent image line group (9) are changed. A first image line (12) formed, a second image line (14) forming a second latent image image line group (10), and a second camouflage image line group (11) are formed. It is necessary that the second image line (14) is overlapped with one convex image line (16).

  More specifically, the first image line (12) constituting the first camouflage image line group (8) and the second image line (14) constituting the second camouflage image line group (11) are: The first image line (12) that completely overlaps the convex image line (16) and constitutes the first latent image image line group (9) has one side of the convex image line (16) and a non-image area portion ( 17), the second image line (14) constituting the second latent image line group (10) is formed over the other side of the convex image line (16) and the non-image area (17). It is necessary to be done.

  However, it is likely that different methods are used for printing and processing the raised convex image line (16) and the composite image group (4), and printing of image lines having different printing methods is often used. It is not easy to match the alignment exactly at the present time, and it is not possible to make the misalignment between the two lines in the image line structure intended at the design stage and the line structure in the actual manufacturing zero. difficult.

  However, the first image line (12) and the second latent image image line group forming the first latent image line group (9), which are images that appear when tilted, among the configurations. The most desirable range in which the second image line (14) forming (10) can be formed will be described with reference to FIG.

  When the first image line (12) forming the first latent image line group (9) is formed in the region shown in the vicinity of the end (19a) from the A side of the convex image line (16) In addition, the effects of the present invention as described above can be obtained.

  Specifically, an area that is inside the convex image line (16) from the edge from the side A of each convex image line (16) to one third of the width of the convex image line (16), and each convex image The region extends from the end of the line (16) from the A side to one third of the width (W4) of the non-image portion (17) on the non-image portion (17) side.

  Of these, more important is a region that enters the inside of the convex image line (16) from the end from the A side of each convex image line (16) to one third of the width of the convex image line (16). The reason for this is that the region extending from the edge from the side A of each convex image line (16) to one third of the width (W4) of the non-image line portion (17) on the non-image line portion (17) side is convex. It is strongly influenced by the rising height of the image line (16), and the area tends to become narrower or wider due to the change in the raised height, but from the A side of each convex image line (16) The region that enters the inside of the convex line (16) from the edge of the convex line to one third of the width of the convex line (16) is relatively unaffected by the rising height of the convex line (16). It is.

  On the other hand, the second image line (14) forming the second latent image line group (10) is an area shown in the vicinity of the end (19b) from the A ′ side of each convex image line (16). In this case, the effects of the present invention as described so far can be obtained. Specifically, an area that is inside the convex image line (16) from the end from the A ′ side of each convex image line (16) to one third of the width of the convex image line (16), and each convex The region extends from the end of the image line (16) from the A ′ side to one third of the width (W4) of the non-image line portion (17) on the non-image line portion (17) side.

  Of these, the more important is the region that enters the inside of the convex image line (16) from the end from the A ′ side of each convex image line (16) to one third of the width of the convex image line (16). . The reason is the same as the area (19a). Conversely, the first image line (12) forming the first camouflage image line group (8) and the second image line (14) forming the second camouflage image line group (11). Are formed in regions other than those shown in 19a and 19b.

  As described above, it is difficult to make the misalignment between the lines to be zero, and even if it is intended to be configured by the positional relationship of the overlap between the most desirable elements at the design stage, the latent image The camouflage image line (12, 15) may be included in the area indicated by 19a and 19b where the image line (13, 14) should enter.

  However, even in such a case, if the ratio of the latent image lines (13, 14) included in the regions 19a and 19b is larger than the ratio of the camouflage lines (12, 15), the visibility is lowered. However, since the first significant image and the second significant image can obtain an effect of being visualized, they are included in the scope of the present invention. In any case, the misalignment of printing at the time of printing is within the error range, and is the technical range of all the inventions.

  It should be noted that the areas shown in 19a and 19b are naturally too small or extremely small when the tilt angle becomes too large (nearly 90 degrees) or the raised height of the convex line (16) becomes too high. In some cases it will disappear. When changing the material, image line configuration, and the like constituting the latent image printed material (1), it is necessary to confirm whether the effect is manifested each time.

  As described above, it is desirable that the convex image line (16) of the latent image print (1) of the present invention has a high refractive index of light. When the convex line (16) having a high refractive index is used, the concealing effect of each line when tilted is increased, and the first latent image line group (9) or the second latent image line group is increased. This is because the visibility of (10) is relatively improved.

  As an example of a method for imparting such a characteristic having a high refractive index to the convex image line (16), a pigment having a high refractive index of light is dispersed in the ink, and the convex image line (16) is subjected to UV drying. It is easy to form by screen printing. UV drying screen printing can easily form a raised image line exceeding 10 μm, and a pigment having a large particle diameter can be used. Therefore, it is one of the desirable methods for forming the convex image line (16) of the present invention. You can say that.

  However, a pigment having a high refractive index of light needs to be transparent or translucent. As a pigment satisfying such characteristics, there is an iris pearl pigment. When the convex line (16) is formed by screen printing using an iris color pearl pigment, it is important that the refractive index of light on the surface of the convex line (16) is high. Rather, it is most desirable to have a so-called leafing state in which the iris pearl pigment is aligned and oriented on the surface of the swelled image.

  As one of the methods for obtaining such an effect, for example, there is a method using a pigment subjected to the water / oil repellent treatment described in the technique described in JP-A-2001-106937. When the projected image line (16) is formed using the applied pigment, the visibility of each latent image image line group (9, 10) that is visually recognized when tilted can be enhanced.

  In the present specification, “observing directly” means that the observer's viewpoint is perpendicular to the print surface of the latent image print (0 °) or an angle close thereto, and the latent image print The term “inclined observation” refers to a state in which the latent image printed material is observed at an angle of at least 45 ° and less than 90 ° from the printing surface of the latent image printed material.

  When the pitch (P1) common to all image line group configurations is designed to be narrow, the tilt angle at which each latent image line group (9, 10) is visualized can be reduced, but the difficulty of printing And the reproducibility of each element tends to decrease. On the other hand, when designed widely, the tilt angle at which each latent image line group (9, 10) is visualized becomes large, but the difficulty of printing is reduced and the reproducibility of each element is also improved. Stabilize. Considering these, it is desirable that the pitch (P1) is configured in the range of about 0.1 mm to 2 mm.

  The “image line” as used in the present specification is a print dot that is a minimum unit for forming a print image and arranged in a specific direction continuously at a certain distance. Say straight lines, curves and wavy lines.

  Hereinafter, examples of the latent image printed matter produced in detail will be described in accordance with the above-described mode for carrying out the invention, but the present invention is not limited to these examples.

  Example 1 will be described with reference to FIGS. 15 to 23. Example 1 is an example in which the composite image group (4-1) is printed by offset printing to form a latent image print (1-1), and the convex image line group (5-1) is formed by screen printing. Thus, both the first image (6-1) and the second image (7-1) are examples formed at the same time with the same ink.

  FIG. 15 is a view showing a latent image printed matter (1-1) according to the present invention, and is provided with a blue printed image (3-1) on a substrate (2-1). As the substrate, general coated paper (manufactured by Nippon Paper Industries) was used.

  FIG. 16 shows a conceptual diagram of each image element constituting the print image (3-1). The basic configuration is the same as that described in the embodiment, and is formed by stacking the composite image group (4-1) and the convex image line group (5-1), and the composite image group (4-1). Is formed with a uniform gradation with no shading, and has a first image (6) and a second image (7). Both the first image (6) and the second image (7) are formed with uniform gradations with no shading.

  The first image (6-1) is paired with the first latent image line group (9-1) representing the first significant information and the first latent image line group (9-1). And a first camouflage line group (8-1) having a configuration in which the negative / positive of the first latent image line group (9-1) is reversed. The first significant information represented by the first latent image line group (9-1) in the first embodiment is a letter “JPN” of the alphabet, and the first latent image line group (9-1) is: This is expressed in a negative state.

  The second image (7-1) is paired with the second latent image line group (10-1) representing the second significant information and the first latent image line group (10-1). And a second camouflage line group (11-1) having a configuration in which the negative / positive of the second latent image line group (10-1) is inverted. The second significant information represented by the second latent image line group (10-1) in the present embodiment is an image of “sakura”, and the second latent image line group (10-1) is Is expressed in a positive state.

  FIG. 17 shows a detailed drawing configuration diagram of the first image (6-1). The first image (6-1) is formed by arranging a plurality of first image lines (12-1) having an image line width of 0.75 mm continuously at a pitch of 0.3 mm in the first direction. The first camouflage in which the letters “JPN” of the alphabet, which is the first significant information, are represented by positive and negative by changing the phase (shifting the phase) of a part of one image line (12-1). It is divided into an image line group (8-1) and a first latent image image line group (9-1).

  FIG. 18 shows a detailed drawing configuration diagram of the second image (7-1). The second image (7-1) is composed of a plurality of second image lines (14-1) having an image line width of 0.75 mm continuously arranged at a pitch of 0.3 mm in the first direction. The second latent image that represents the image of the “cherry blossom”, which is the second significant information, in positive and negative by changing the phase (shifting the phase) of a part of the second image line (14-1). It is divided into a line group (10-1) and a second camouflage drawing line group (11-1).

  FIG. 19 shows a detailed image line configuration of the composite image group (4-1) including the first image (6-1) and the second image (7-1). The first image forming the first latent image line group (9-1) (12-1) and the first image forming the first camouflage line group (8-1). A line (12-1), a second image line (14-1) forming a second latent image line group (10-1), and a second camouflage line group (11-1) are formed. The second image lines (14-1) are arranged alternately and regularly and do not overlap each other with a phase shift in the first direction.

  The composite image group (4-1) having the above-described configuration was printed by the offset printing method using the blue offset ink (DaiCure Aviglio Process Indigo N).

  FIG. 20 shows a detailed image line configuration diagram of the convex image line group (5-1). The convex line group (5-1) has a convex line (16-1) having a width of 0.2 mm continuously arranged in the first direction at a pitch of 0.3 mm, and the convex line ( 16-1) and a non-image portion (17-1) having a width of 0.1 mm are provided between the convex image line (16-1). The convex image line group (5-1) having the above configuration is superimposed on the composite image group (4-1) as shown in FIG. 21, using the ink shown in Table 1 by UV-drying screen printing. Printed. The raised height of the convex line (16-1) was 20 μm.

  The screen ink shown in Table 1 contains an iris pearl pigment that emits a golden interference color when light enters, and the image line formed with this ink is colorless and transparent in the state where no specular reflection light is generated. In the state where the specularly reflected light is generated, a convex image line (16-1) emitting a golden interference color is obtained.

  Note that the iris pearl pigment mixed with the present ink imparts water repellency and oil repellency to the pigment surface, and has the property of being oriented on the surface of the raised image. The reason for blending such a special pigment is not to obtain a beautiful interference color of pearl under specular reflection light as in the case of using a generally considered iris pearl pigment, but the convex line (16-1 This is because the refractive index of light on the surface is increased and the concealability of the two camouflage line groups and one latent image line group existing under the convex line (16-1) is increased.

  FIG. 22 shows the positional relationship between the image line constituting the composite image group (4-1) and the convex image line (16-1). The first image line (12-1) forming the first latent image line group (9-1) is located on the A side in the convex image line (16-1). Specifically, the non-image portion (17-1) is 0.25 mm, the convex image line (16-1) so as to straddle the convex image line (16-1) and the non-image portion (17-1). Is formed at a position where the image line overlaps by 0.5 mm.

  On the other hand, the second image line (14-1) forming the second latent image line group (10-1) is positioned on the A ′ side of the convex image line (16-1). Specifically, the non-image portion (17-1) is 0.25 mm, the convex image line (16-1) so as to straddle the convex image line (16-1) and the non-image portion (17-1). Is formed at a position where the image line overlaps by 0.5 mm.

  The first image line (12-1) forming the first camouflage line group (8-1) and the second image forming the second camouflage line group (11-1). The line (14-1) is a convex that has entered the inside of the convex image line (16-1) by 0.5 mm or more from the end of each convex image line (16-1) to the center side of the convex image line (16-1). It is formed under the image line (16-1).

  In FIG. 23, the effect of the latent image printed matter (1-1) of Example 1 produced by the above procedure is shown. When the latent image printed matter (1-1) is observed from the viewpoint (18a-1) facing the latent image printed matter (1-1) like the viewpoint (18a-1) shown in FIG. The blue composite image group (4-1) was observed, and the first significant image and the second significant image were invisible.

  On the other hand, as shown in FIG. 23 (a), when the latent image print (1-1) is tilted and observed from the viewpoint (18b-1) in the first direction, as shown in FIG. 23 (b). The first latent image line group (9-1) in which the first significant information, which is the letters “JPN” of the alphabet, is negative is visually recognized in blue, and as shown in FIG. When the printed image (1-1) is tilted and observed from the viewpoint (18c-1) in the second direction, as shown in FIG. 23 (c), the second significant information that is an image of “sakura” The second latent image line group (10-1) represented by a positive was visually recognized in blue. As described above, it was confirmed that different images can be visually recognized depending on the direction of observation when tilted.

  Example 2 will be described below. Example 2 is an example in which a latent image print (1-1) is formed with the same image line configuration as in Example 1, but the first image (6-1) and the second image (7-1). Is formed with inks of different hues. Except for using inks of different hues for the first image (6-1) and the second image (7-1), it is exactly the same as in Example 1, so the description of the structure and dimensions of the base material and image Is omitted.

  In Example 2, the first image (6-1) is a blue first ink (DaiCure Aviglio Process Indigo N), and the second image (7-1) is a red second ink (DaiCure). Avirio Process Red).

  In this case, as shown in FIG. 23 (a), when the latent image printed matter (1-1) is observed from the viewpoint (18a-1) facing the latent image printed matter (1-1), the gray composite The image group (4-1) was observed, and the first significant image and the second significant image were invisible. On the other hand, when the latent image printed material (1-1) is tilted and observed from the viewpoint (18b-1) in the first direction, as shown in FIG. The first latent image line group (9-1) representing the first significant information as a negative is visually recognized in blue, and the latent image printed matter (1-1) is tilted to make the second from the viewpoint (18c-1). When observed in the direction, as shown in FIG. 23 (d), the second latent image line group (10-1) representing the second significant information which is the image of “sakura” is positive. It was visually recognized. As described above, it was confirmed that not only different images could be visually recognized depending on the direction of observation when tilted, but also the hue changed.

DESCRIPTION OF SYMBOLS 1, 1-1 Latent image printed matter 2, 2-1 Base material 3, 3-1 Print image 4, 4-1 Composite image group 5, 5-1 Convex line group 6, 6-1 1st image 7, 7-1 Second image 8, 8-1 First camouflage line group 9, 9-1 First latent image line group 10, 10-1 Second latent image line group 11, 11-1 Second camouflage drawing line group 12, 12-1 First drawing line 14, 14-1 Second drawing line 16, 16-1 Convex drawing line 17, 17-1 Non-drawing part 18a, 18b, 18c, 18d, 18e, 18f, 18a-1, 18b-1, 18c-1 The viewpoint 19a of the observer Among the areas that do not become invisible, the area 19b that can form the first latent image line, among the areas that do not become invisible The area 20 in which the latent image line can be formed The latent image printed matter formed by the conventional technique

Claims (5)

A printed image is provided on at least a part of the substrate,
The printed image is formed by laminating a convex line group having a bulge in a transparent or translucent layer on a composite image group formed in a color different from that of the substrate,
The composite image group includes a plurality of first image lines arranged in a first direction at a specific pitch, and the first significant information is obtained by different phases of a part of the first image lines. A plurality of first images divided into a first camouflage image line group and a first latent image image line group, and a second image line arranged in the first direction at the pitch. The second image line is divided into a second latent image line group and a second camouflage line group constituting the second significant information by different phases of the second line. Consisting of
The first image line constituting the first camouflage image line group and the second image line constituting the second latent image image line group are regularly and alternately arranged without overlapping, The first image line constituting the first latent image line group and the second image line constituting the second camouflage line group are regularly and alternately arranged without overlapping. And
The convex image line group is composed of a plurality of convex image lines formed in the first direction at the pitch,
The first image line constituting the first camouflage image line group and the second image line constituting the second camouflage image line group overlap with the convex image line, and the first latent image The first image line constituting the image line group partially overlaps the convex image line so as to straddle the non-image line portion between the convex image line and the convex image line, and the second latent image image The second image line constituting the line group is formed so as to partially overlap the convex image line so as to straddle the convex image line and the non-image line part,
Under the visible light, the synthetic image group is visually recognized when observing directly, and when observing from the first direction tilted, either the first significant information or the second significant information The latent image printed matter is characterized in that the other is visually recognized when viewed from a direction opposite to the first direction. The total area ratio of the first camouflage line group, the first latent image line group, the second latent image line group, and the second camouflage line group within a predetermined range is the same. The latent image printed matter according to claim 1 , wherein the latent image printed matter is an area ratio. The first latent image line group and the first camouflage line group have the same color, and the second latent image line group and the second camouflage line group have the same color. The latent image printed matter according to claim 1 or 2 . The first depends streaks and the second image line of the phase, according to any one of claims 1 to 3, characterized in that a ¼ pitch of the first pitch Latent image printed matter. The first image line constituting the convex image line and the first latent image image line group, the second image line constituting the convex image line and the second latent image image line group, The latent image printed matter according to any one of claims 1 to 4 , wherein the latent image printed matter overlaps with a width of one third of the line width of the convex line.

Images