JP5142153B2 - Latent image printed matter - Google Patents

Description

  The present invention forms two images consisting of convex-shaped image lines using ink containing a specular gloss material on a substrate, and the appearance of a latent image with a beautiful gradation of light by the incidence of light. The present invention relates to a latent image printed material that can be printed.

  In recent years, anti-counterfeiting elements and printing techniques having new design properties and high anti-counterfeiting effects have been desired for valuable printed matter that requires security.

  For example, as a technique having a design property and an anti-counterfeit effect, there is one using an optical security element such as a hologram whose image changes depending on an observation angle or an ink having an optical function.

  As an example, the present applicant forms a swelled image line using a plane-oriented pearl pigment, and observes obliquely by configuring the image line angle in the background information area and the message information area. In addition, an invention relating to a latent image printed matter having an effect that the message information area appears changing from positive to negative has been filed (see, for example, Patent Document 1 and Patent Document 2).

  In addition, the applicant of the present application divides a specific image, configures the divided areas with striated line strokes, and further gradually changes the arrangement direction of the line strokes that form each divided area, An application has been filed for anti-counterfeiting technology in which the color or brightness of a specific image changes continuously by observing gradually from the vertical direction to the base material by printing with ink (for example, Patent Document 3). reference).

  In the latent image printed matter disclosed in Patent Document 1 and Patent Document 2, a background image and a message image are formed by an image line structure that is raised on the surface of the base material, and the image line pattern and the message image of the background image are formed. Since the line pattern is formed at different angles, the message image is hardly visible with the naked eye in the angular region where diffuse reflected light is dominant, and regular reflected light is dominant from diffuse reflected light. The effect is that the message image can be visually recognized as a negative image or a positive image because the background image and the message image having a bulge have different light reflections with respect to the incident light as the angle region changes. Have

  Further, the anti-counterfeit printed matter disclosed in Patent Document 3 has a region that shines the most strongly because the line angle of each divided region in the specific image is different when observed in the horizontal direction gradually from the vertical direction. It has a dynamic visual effect that changes continuously according to the inclination of the printed material.

Japanese Patent No. 3718712 Republished Patent W02003 / 013871 JP 2005-41084 A

  The latent image printed matter described in Patent Document 1 and Patent Document 2 appears when the message portion changes from a negative image to a positive image or from a positive image to a negative image depending on the incident angle of light when observed from an oblique direction. When light having an intermediate angle between the line angles of the image pattern forming the background image and the message image is incident (specifically, the line angle of the image pattern forming the background image is 90 ° and the message image is When the image line angle of the image pattern to be formed is 0 ° and light from an angle of 45 ° is incident), the background image and the message image have the same color, and the entire message image is completely lost. There was a problem of lack of authenticity.

  The anti-counterfeit printed matter described in Patent Document 3 has a visual effect like a moving image, and has characteristics of excellent color or shade change as compared with the techniques described in Patent Document 1 and Patent Document 2, but each region There is a problem that the contrast between adjacent regions is greatly reduced because the difference in the image line angle between them is smaller than the techniques described in Patent Document 1 and Patent Document 2. Also, in an environment illuminated by a large number of lights, such as in a normal office, the areas often appear mixed and appear, and in combination with the problem of lowering contrast, it affects the visibility of the latent image. There was a problem.

  The present invention aims to solve the above-mentioned problems, and has a beautiful gradation by using an ink containing specular gloss and forming a background area and an information area by a convex image line on a substrate. An object of the present invention is to provide a latent image printed material that can authenticate a latent image and has a clear contrast.

  The latent image printed matter of the present invention is a latent image printed matter having a print area composed of an information area and a background area adjacent to the information area on a substrate, and the image changes depending on the observation angle. And the background region is formed by a convex image line made of a material having a specular gloss, and either one of the information region and the background region has the first image line having a common circular center at the center. On the other hand, a plurality of areas are arranged at the first pitch, and an area different from either one is formed by arranging the second image line radially and a plurality at the second pitch, and is a boundary between the information area and the background area. The latent image printed matter is characterized in that the second image line and the first image line are arranged adjacent to each other within an angle range of 60 ° to 120 °.

  The latent image print according to the present invention is a latent image print in which the first image line is a combination of at least one of an arc-shaped image line, a circular image line, an elliptical arc-shaped image line, and an elliptical image line. is there.

  The latent image printed matter of the present invention is a latent image printed matter characterized in that the second image line is a curve or a straight line.

  The straight line or the curve in the latent image print of the present invention is a straight line or a curve having the same image line width or a straight line or a curve in which the image line width continuously changes from the center to the outside. It is.

  The second pitch in the latent image printed material of the present invention is the latent image printed material characterized in that the second image lines adjacent to each other are at an angle with respect to the center of the circle.

  The latent image printed matter of the present invention is a latent image printed matter characterized in that the height of the convex image line is 3 μm or more and 150 μm or less.

  In the latent image printed matter of the present invention, the print area has a first pattern area formed by a difference in the line area ratio between the line width of the first line and the line width of the second line. Is a latent image printed matter.

  The latent image printed matter of the present invention is characterized in that the print area has a second pattern area by a straight line formed by arranging a plurality of third image lines in the first direction and at a third pitch. It is a latent image printed matter.

  The latent image printed material of the present invention is characterized in that the material having specular gloss includes at least one selected from an iris pearl pigment, a scaly mica pigment, a scaly metal pigment, a glass flake pigment, or a cholesteric liquid crystal pigment. Latent image printed matter.

  The latent image print according to the present invention does not disappear when the light having an intermediate image line angle between the background image and the image pattern forming the latent image is incident. Can be provided.

  Moreover, the latent image printed material according to the present invention can provide a printed material with a clear contrast of the latent image without reducing the contrast between adjacent regions.

FIG. 2 is a plan view of the latent image printed matter 1 of the present invention. The top view which shows the information area | region of the latent image printed matter 1 of this invention. The top view which shows the background area | region of the latent image printed matter 1 of this invention. The top view which shows the boundary of the information area | region and background area | region of the latent image printed matter 1 of this invention. FIG. 3 is a three-dimensional view showing a boundary between an information area and a background area of the latent image printed matter 1 of the present invention. The top view which shows an example of the latent image printed matter of this invention. The top view which shows an example of the latent image printed matter of this invention. The top view which shows the principle of the gradation effect in the latent image printed matter 1 of this invention. The top view which shows the principle of the visual recognition effect in the latent image printed matter 1 of this invention. FIG. 3 is an observation view of the latent image printed matter 1 of the present invention. FIG. 3 is a plan view showing a latent image printed matter 1 ′ according to the present invention. The top view which shows the information area | region of latent image printed matter 1 'of this invention. The top view which shows the background area | region of latent image printed matter 1 'of this invention. FIG. 3 is an observation view of a latent image print 1 ′ according to the present invention. FIG. 3 is a plan view showing a latent image printed material 1 ″ according to the present invention. The top view which shows the information area | region of latent image printed matter 1 '' of this invention. The top view which shows the background area | region of latent image printed matter 1 '' of this invention. FIG. 3 is an observation view of a latent image print 1 ″ according to the present invention.

  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 claims.

  Fig.1 (a) is an example of the latent image printed matter (1) in this invention. As shown in FIG. 1 (a), the latent image print (1) has a print region (3) on the substrate (2). The print area (3) is formed by the information area (4) shown in FIG. 1 (b) composed of the convex first image line formed by the ink containing specular gloss and the ink containing the specular gloss. It consists of a background region (5) shown in FIG. The first image line forming the information area (4) and the second image line forming the background area (5) are arranged adjacent to each other at the boundary between the information area and the background area. The reason why the periphery of the information area (4) and the interior of the background area (5) are blank is for convenience of explanation.

FIG. 2 is a diagram for explaining the information area (4). As shown in FIG. 2A, the information area (4) in this example has a convex shape and the first image line (A ₁ ) having the same circle center (Q) is transferred to the first pitch ( A plurality of images are arranged by P ₁ ) to form an image of “sakura”. As shown in FIG. 2B, the first image line (A ₁ ) is a convex image having the same circle center (Q), and a circular image line and a circle having the image line width (T ₁ ). Arc-shaped streaks were used. The first image line (A ₁ ) is not particularly limited as long as the circular image line and the circular image line and the circular image line have the same center, and an elliptical image line can be used. . The height of the convex image line is 3 μm or more and 150 μm or less.

The reason why the height is limited in this way is that when the height is less than 3 μm, even if the image line has a different image line angle, the image line height is too low, so only uniform reflection occurs. This is because the light intensity corresponding to the image line angle that is essential in the invention does not occur. On the other hand, if the height exceeds 150 μm, the effect of the present invention is produced, but even if a printing method capable of forming a bulge such as intaglio printing or screen printing is used, it is limited by the height of the image line that can be easily formed. This is because even if it can be formed at a height higher than this, it is not realistic in consideration of the stacking and distribution suitability of printed matter. The image line width (T ₁ ) is 10 μm to 1000 μm. This is because it is difficult to stably form an image line having a size of 10 μm or less by printing, while an image having a size of 1000 μm or more becomes rough and the design is significantly limited. Further, the first pitch (P ₁ ) is also preferably larger than 10 μm and about 1000 μm for the same reason as the image line width (T ₁ ).

FIG. 3 is a diagram for explaining the background area (5). As shown in FIG. 3A, the background region (5) in this example is convex with respect to the base material (2) as the _second image line (A ₂ ) whose image line width continuously changes. Are formed by arranging a plurality of _second image lines (A ₂ ) whose image line widths (T ₂ ) continuously vary radially from the center (Q) and at the second pitch (θ ₂ ). Is done. As shown in FIG. 3B, the second image line (A ₂ ) is formed by arranging a plurality of straight lines radially from the circle center (Q) and at intervals of the _second pitch (θ ₂ ). Is done. The dotted line portion is provided for convenience of explanation, and does not actually exist. The second image line (A ₂ ) is not particularly limited as long as it is a radial image line, and a curve or a straight line can be used. Further, it can be formed by a straight line or a curved line by pixels or halftone dots. In this embodiment, a radial image line centered on the circle center (Q) is used, but the radial image line is not particularly limited as long as it is a radial image line, and a radial image centered on a position slightly shifted from the circle center (Q). Can also be used. An example centered on a position slightly deviated from the center (Q) will be described later. The second pitch is an angle formed between adjacent second image lines with respect to the center of the circle, and the image line width (T ₂ ) and the second pitch (θ ₂ ) are the information area ( It is determined by the configuration of 4).

In this example, the image line width (T ₂ ) is formed so as to continuously increase in the outer circumferential direction, but an image line having the same image line width (T ₂ ) can also be used. The reason why it is formed to be continuously thicker in the outer circumferential direction is to make the interval between the outer circumferential direction and the image line near the center of the circle the same, and to keep the density of the entire background region (5) uniform. . The reason why the density of the background region (5) must be kept uniform in this way is that the background region (5) appears in the image observed under diffuse reflected light when formed by an image line having a color different from that of the substrate. This is to prevent the light and shade of) from being reflected. Conversely, when a transparent image line is formed with a bright pearl ink or the like, there is no problem even if it is formed with the same image line width. The height of the convex line is registered using a single process using the same ink as the image line forming the information area or the same color ink, without any gap in one hair. , Since they are formed by so-called hair removal, they have the same or substantially the same height. In this embodiment, the information area (4) is formed by a circular image line, and the surrounding background area (5) is formed by a radial image line. The information area (4) is formed by a radial image line, The surrounding background region (5) can also be formed by a circular drawing line. The circle center (Q) is provided for convenience of explanation, and does not actually exist.

  The image line group that forms the information area (4) and the background area (5) is not particularly limited as long as it has a specular gloss, and can be formed transparent or colored. In order to form an image line having a specular gloss, an ink containing an optically changing pigment is used. The ink containing the glittering material may be any ink containing metallic ink such as gold ink or silver ink, pearl pigment, scale-like mica, scale-like metal pigment, glass flake pigment, cholesteric liquid crystal pigment, etc. Particularly preferred are inks to be used.

  Next, the case where the ink containing a pearl pigment is used will be described. The particle size of the pearl pigment is selected according to the printing method to be used. In order to improve the orientation (leafing effect) of the scale pigment of the pearl pigment to be used, it is preferable to perform a treatment such that the pigment is oriented on the surface of an image having a bulge of 10 μm to 150 μm during printing. Specifically, for example, by performing surface treatment of the pigment such as water repellency and oil repellency treatment as described in JP-A-2001-106937, the pigment can be oriented on the surface of the image line of the printing portion. This makes it possible to make the interference color of pearl caused by specular reflection light appear more vividly.

  The convex image line forming the information area (4) and the background area (5) forms an image line with a bulge of 3 μm to 150 μm and uses a material having a specular gloss with a large particle size. Since it is necessary, it is formed by using a flexographic printing method, a gravure printing method, a screen printing method or an intaglio printing method. In particular, the UV drying type screen printing method is preferable from the viewpoint of the degree of freedom of the height of the image line to be formed and the tolerance of the particle size of the pearl pigment to be used.

Next, the boundary between the background area (5) and the information area (4) of the latent image print (1) will be described. FIG. 4 is an enlarged view of the boundary between the background area (5) and the information area (4) of the latent image printed matter (1). The first image line (A ₁ ) forming the information area (4) and the second image line (A ₂ ) forming the background area (5) are the boundary between the background area (5) and the information area (4). Are arranged adjacent to each other so as to have a predetermined angle (θ ₁ ). The predetermined angle (θ ₁ ) is not less than 60 ° and not more than 120 °, and most preferably 90 °. This is because when the angle is 60 ° or less or 120 ° or more, the contrast is lowered and the visibility is poor. The reason why the angle of 90 ° is most preferable is that the angle described above exhibits the highest contrast at the boundary, which is the effect of the present invention. As shown in FIG. 5, the latent image printed material (1) is composed of a convex image line group in both the background region (4) and the information region (5). The latent image printed material (1) includes a background region (5) formed by the second image line (A ₂ ) and an information region (4) formed by the _first image line (A ₁ ). . In the present invention, the term “adjacent” means that at least a part of the region is in contact or at least a part of the region overlaps and is in contact.

  Next, as shown in FIG. 6, a configuration example of each of the background area (5) and the information area (4) of the latent image printed matter (1) of the present invention will be described. FIG. 6A shows an information area (4) using an elliptical image line as a first image line, and a background area (5) using a radial image line as a second image line. It is the example which comprised. FIG. 6 (b) shows that the second image line constituting each cherry blossom petal, which is the information area (4), is constituted by a radial image line having a slight inclination on a straight line, and the first image line is a circle. This is an example in which a background region (5) is configured using a line image. FIG.6 (c) is the example comprised by the radial image line by the curve which slightly curved the straight line which is the 2nd image line which comprises each petal of a cherry tree separately. As shown in FIG. 6B and FIG. 6C, the radial stroke is not limited to a straight line arranged radially around the center of the circle, but is centered at a position where the curve or straight line is slightly shifted from the center of the circle. Also included are those arranged radially. FIG. 6D shows an information area (4) formed using a linear radial line as the second line, and a background area (5) using a circular line as the first line. And the characters “Japan” are formed as the first pattern region (7) by differentiating the line area ratio in a part of each line in the first line and the second line. This is an example in which the characters “National Printing Bureau of Japan” are decoratively formed with solid characters.

Next, as shown in FIG. 7, an example will be described in which the second pattern region is formed using the third image line in the print region (3) of the latent image print (1) of the present invention. FIG. 7A shows an information area (4) using a circular image line as a first image line and a background area (5) using a radial image line as a second image line. As shown in the enlarged view, a straight line is used as the third image line (A ₃ ), and the second pattern is arranged in parallel as the first direction at the third pitch (T ₃ ). This is an example in which the region (8) is formed. FIG. 7B shows a background area (5) using a circular image line as a first image line and an information area (4) using a radial image line as a second image line. This is an example in which the second pattern region (8) is formed with the same configuration as in FIG. FIG. 7 (c) shows that the information area (4) is formed using a radial radial line as the second line, and the background area (5) using the circular line as the first line. As shown in the enlarged view, a straight line is used as the third image line (A ₃ ), and a plurality of second lines are arranged in the vertical direction as the first direction by the _third pitch (T ₃ ). This is an example in which the characters “Japan” are formed as the pattern region (8). Note that the first direction is a direction in which the third image line does not coincide with the first image line and the second image line.

  In any of the examples, a combination of a circular image line and a straight line is used, and the boundary line where the circular image line and the straight line are in contact has an average relationship close to orthogonal. It is possible to obtain a gradation effect and a moving image-like change in the case of regular reflection and an effect of expressing a high contrast at the boundary. However, the contrast at the boundary portion decreases as the angle of intersection of the two drawing lines at the boundary portion is away from 90 °, and at an angle of 60 ° or less and 120 ° or more, the contrast is visually reduced by about half. In the case of using a configuration in which the center of a circular image is shifted from the center of a straight line, or when an image configuration in which the image or circle is slightly changed is used, the adjacent angle of each image in the contour is set to 60 degrees. It is desirable to be within a range of ˜120 °. Further, as shown in FIG. 6D, when an image is formed by a difference in image line width (a difference in area ratio), the difference in area ratio is set to about 10% to 30%. When the difference between the line widths is too large, the effect of disappearing the characters “Japan” in the observation angle region F is reduced. When the difference between the line widths with the surroundings is too small, in the observation angle region E. This is because the visibility of the characters “Japan” is lowered. The difference in the area ratio is a difference in the ratio of the line area occupied in a certain area between the first line and the second line.

  The substrate (2) is not limited to paper, and a plastic card or the like can also be used. Further, the base material color is not limited to white.

  Next, the principle by which the gradation effect of the latent image printed matter of the present invention is exhibited will be described only when the observer's viewpoint is within the observation angle region in which diffuse reflection light and regular reflection light are mixed. In addition, the description regarding this observation angle area | region is mentioned later.

  A convex image line reflects light most strongly on a surface orthogonal to (normal to) the light. Therefore, when a line group is formed by collecting straight lines having specific angles, the line group most reflects light when light enters from an angle orthogonal to the line group. On the other hand, when the angle is parallel to the angle of the incident light, the reflection of the light of the image line group is the weakest.

  For example, as in the inventions described in Patent Document 1 and Patent Document 2, when a printing area having a background area and an information area is formed by using two lines having different angles and using a straight line having a convex shape, The incident light creates a negative / positive relationship of light in the print area, and a contrast occurs between the background area and the information area, so that a latent image appears. However, considering the moment when the latent image appears, focusing only on either the background area or the information area, the entire image reflects light evenly in each of the background area and the information area. Only very simple reflections occur. Therefore, as long as the background area and the information area are configured by a group of straight lines having a single angle, only a simple binary image can be formed by light negative / positive, and naturally the light intensity is delicate as in the present invention. It is impossible to produce a changing gradation.

  In the present invention, a radial image line group in which individual straight lines are arranged at different angles, a circular image line, an arc-shaped image line having the same circle center as the circular image line, and the same circle center. It is configured using an image line selected from the arranged circular image line group and arc-shaped image line group. These lines are provided with any line angle of 360 ° due to the characteristics of the line structure. Therefore, there is always an image line that shines strongly and orthogonally to the incident light with respect to incident light at all angles, and simultaneously there is an image line that shines weakly in parallel with the incident light. In addition, since there are many angled lines located in the middle, it is possible to realize a gradation effect of light that is more varied and beautiful.

  In addition, when the angle of the incident light changes even slightly, the position of the image line that emits the strongest light or the light line that weakly shines in the latent image print also changes accordingly. Therefore, when the latent image print composed of the radial image line, the arc image line, and the circular image line is observed while being tilted with respect to the light, the light gradation is a circle of the radial image line or the arc image line. This produces a moving image effect that is viewed by rotating around the heart.

  As described above, an arc-shaped image line, a circular image line, and a radial image line can exhibit a characteristic gradation effect even if each of them is used alone. A special effect can be obtained by using a pair of a line, a circular line and a radial line. The effect is that no matter what angle the light is incident from, the contrast is not impaired at the boundary portion where the information area and the background area are in contact. The effect will be described below.

FIG. 8 shows an area constituted by an information area (4) formed by radial lines and a background area (5) formed by circular lines. Assuming that the radial image line and the circular image line are convex image lines having specular gloss, when the horizontal light (L ₁ ) is incident on the information area (4) from the light source (K ₁ ), the information area Of the image lines constituting (4), the light beam that reflects light most strongly is the image line around Cv-Cv ′, and the light beam that has the weakest reflection is the image line around Ch-Ch ′. . In addition, when horizontal light (L ₁ ) is incident on the background area (5) from the light source (K ₁ ), it is Dh−Dh that reflects light most strongly among the parts constituting the background area (5). The image around 'Dv-Dv' is the image around the Dv-Dv '. Further, when the light source (K ₂₎ from the vertical light (L ₂₎ is incident on the information area (4), to reflect most strongly light in streaked constituting the information area (4), Ch - An image line around Ch ′, and the image line around Cv-Cv ′ has the weakest light reflection. Further, when the light source _{(K 2)} from the vertical light _{(L 2)} is incident to the background region (5), of the portion constituting the background area (5), to reflect most strongly light, Dv-Dv The image around “Dh-Dh” is the image around “Dh-Dh”.

  As described above, the positions where the information region (4) and the background region (5) strongly reflect light with respect to incident light from a certain direction are completely opposite. This is not a phenomenon limited to light in the horizontal or vertical direction, but is a phenomenon that is established even when light is incident at any angle of 360 °. That is, in the case where the information area (5) and the background area (4) are formed using a pair of a circular image line and a radial image line as in the latent image printed material of the present invention, light is incident from all angles. However, a strong contrast is always generated at the boundary between the information area (5) and the background area (4), and an image appears with high contrast.

  However, such a phenomenon occurs because, at the boundary portion where the background region (4) and the information region (5) are in contact with each other, the image line groups are almost orthogonal to each other. Even if a circular image line is used as a pair, the contrast of the image will be low unless the image lines are close to each other at the boundary. Therefore, in order to maintain this relationship, it is necessary to use a pair of radial lines and circular lines whose circular centers are at the same position or close positions. Only when these conditions are satisfied, an image can be viewed with high contrast. This effect is obtained when the background region (4) and the information region (5) are formed by two orthogonal lines, and the contrast is lost with respect to light incident at an intermediate angle between the two lines. As long as an image is formed with the above-described configuration, the contrast of the entire image can be kept constant regardless of the angle at which light is incident.

  In the latent image printed material of the present invention, the background region (4) and the information region (5), the most intensely shining region in each image, rotate slowly with a beautiful gradation, and a very unique dynamic vision This is a principle that exerts an effect, and is a principle that the contrast is not impaired at the boundary portion where the information area and the background area are in contact with each other, and the visibility of the image is not deteriorated.

Subsequently, an image in which the latent image printed material of the present invention is visually recognized for each observation angle region will be described. FIG. 9 shows the positional relationship between the latent image printed material (1) of the present invention, the light source (K ₃ ), and the observer's viewpoint (6) for each observation angle.

  When light is incident at a specific angle, an angle region in which the strongest regular reflected light is generated at the same angle opposite to the incident light is generated. For example, when light is incident at an incident angle of −45 °, the light receiving angle of 45 ° ± 5 ° is an observation angle region where the specular reflection light is dominant, and the specular reflection light increases as the angle difference from the incident angle increases. , And the diffusely reflected light becomes dominant. In this specification, the observation angle region in which diffuse reflection light having a light reception angle of −20 ° to 10 ° and 80 ° to 90 ° is dominant is “observation angle region E”, and regular reflection light having a light reception angle of 45 ° ± 5 °. Is the observation angle region where the diffuse reflection light and regular reflection light are mixed except for the “observation angle region E” and the “observation angle region G”. It is defined as “F” and each observation angle region is schematically shown in FIG.

  When the observer's viewpoint is in the observation angle region E and the latent image print (1) of the present invention is formed with an ink having a color different from that of the base material such as a metallic ink, FIG. As shown in a), the pattern of the print area (3) is visually recognized. Further, when formed with a transparent image line such as pearl ink, as shown in FIG. 10B, the print region (3) cannot be visually recognized, and only the substrate (2) is visible. When the viewpoint of the observer (6) is in the observation angle region F, the information region (4) and the background region (5) as shown in FIGS. 10 (c) and 10 (d) according to the angle of the incident light. The cherry blossom pattern formed by the two areas is visually recognized. Therefore, in the observation angle region F, the background region (4) and the information region (5) are visually recognized with their gradations reversed at the boundary while each having a beautiful gradation. 10C shows an image when light is incident from the horizontal direction, and FIG. 10D is an image when light is incident from the vertical direction. In the observation angle region G, the image is almost lost due to strong incident light, but since this observation angle region G exists only in a very narrow region and is sandwiched by the observation angle region F, the observer's As a subjectivity, it feels like the cherry blossom buds shown in FIG. 10C and FIG. The above is an image visually recognized for each observation angle region in the latent image printed material (1) of the present invention.

FIG. 11 shows the latent image print (1 ′) of the first embodiment. In this example, as shown in FIG. 11, a printing region (3 ′) was formed on the base material (2 ′) by a convex image line using the UV drying screen ink shown in Table 1. The height of the convex image line is approximately 10 μm. The print area (3 ′) includes an information area (4 ′) and a background area (5 ′). The straight line is used as the second image line to form the information area (4 ′), and the first image line is formed. A background region (5 ′) was formed using a circular image line and an arc-shaped image line. In addition, as shown in the enlarged view, the first image line and the second image line are arranged adjacent to each other at an angle of 90 ° (θ ₁ ′) at the boundary portion.

The information area (4 ′) has a “cherry blossom” pattern as shown in FIG. 12 (a), and an image line width (T ₂ ′) is shown in the circle center (Q ′) as shown in FIG. 12 (b). A straight line (A ₂ ′) having a line width of 200 μm from the width of 50 μm to the outermost peripheral portion and increasing in proportion to the distance from the center was used. A plurality of second pitches (θ ₂ ′) are arranged at intervals of 2 ° around the center of the circle (Q ′).

The background region (5 ′) has a circular pattern as shown in FIG. 13A, and the first image line (A 1) having an image line width (T ₁ ′) of 150 μm as shown in FIG. 13B. _A plurality of circular and arcuate lines ₁ ′) are arranged with a _first pitch (P ₁ ′) of 300 μm.

  The ink shown in Table 1 is a colorless and transparent ink which has no object color and contains an iris pearl pigment having a gold interference color, and emits a gold interference color when light enters. Therefore, the observation angle region E is completely colorless, and the observation angle region F and the observation angle region G emit a golden interference color.

  The latent image print (1 ') of the present invention was completely invisible in the observation angle region E, and only the substrate (2') could be observed. On the other hand, in the observation of the observation angle region F, as shown in FIGS. 14A and 14B, the information region (4 ′) and the background region (5 ′) each have a golden gradation that is an interference color of pearl. At the same time, it was confirmed that the density was reversed and visually recognized at the boundary. 14A is an image when light is incident from the horizontal direction, and FIG. 14B is an image when light is incident from the vertical direction. As described above, the effect of observing a latent image with high visibility was confirmed while a beautiful golden gradation rotated and viewed according to the angle of light incident on the image.

  Next, an example will be described in which an information region is formed using a circular image line and an arcuate image line as the first image line, and a background region is formed using a straight line as the second image line.

  FIG. 15 shows the latent image printed matter (1 ″) of the second embodiment. In this example, a printing area (3 ″) is formed on a base material (2 ″) by a convex image line using a silver metallic ink (Miracene manufactured by Wallstenholm) which is a UV drying type screen ink. did. The ink is a silver-colored ink that is visually recognized as gray in the observation of the observation angle region E, and is visually recognized as silver having high brightness in the observation of the observation angle region F and the observation angle region G.

In this example, as shown in FIG. 15A, a printing region (3 ″) was formed on the base material (2 ″) by a convex image line. The height of the convex image line is approximately 10 μm. The print area (3 ″) is composed of an information area (4 ″) and a background area (5 ″), and uses a circular image line and an arc-shaped image line as the first image line, and the information area (4 '') And a background area (5 '') was formed using a straight line as the second image line. As shown in the enlarged view, the first image line (A ₁ ″) and the second image line (A ₂ ″) are adjacent to each other at an angle of 90 ° (θ ₁ ″) at the boundary. Arranged.

As shown in FIG. 16A, the information area (5 ″) includes a circular image line and a circle that are the _first image line (A ₁ ″) having an image line width (T ₁ ″) of 100 μm. A plurality of arcuate streaks are arranged with a _first pitch (P ₁ ″) of 200 μm.

As shown in FIG. 17A, the background area (5 ″) has an image line width (T ₂ ″) of 50 μm from the image line width at the center (Q ″) to the image line width at the outermost periphery. A straight line that becomes thicker in proportion to the distance from the center of 200 μm was defined as the second image line (A ₂ ″). As shown in FIG. 17B, a plurality of second pitches (θ ₂ ″) are arranged at intervals of 2 ° around the center of the circle (Q ″).

  The latent image print (1 ″) of the present invention was completely invisible in the observation angle region E, and only the substrate (2 ″) could be observed. On the other hand, in the observation of the observation angle region F, as shown in FIGS. 18A and 18B, the background region (4 ″) and the information region (5 ″) each have a silver color which is a pearl interference color. It was confirmed that the gradation was reversed and visually recognized at the boundary with gradation. 18A is an image when light is incident from the horizontal direction, and FIG. 18B is an image when light is incident from the vertical direction. As described above, the effect of observing a latent image with high visibility was confirmed while a beautiful silver gradation rotated and viewed according to the angle of light incident on the image.

1, 1 ′, 1 ″ latent image print 2, 2 ′, 2 ″ base material 3, 3 ′, 3 ″ printing area 4, 4 ′, 4 ″ information area 5, 5 ′, 5 ″ background Area 6 observer 7 first pattern area 8 second pattern area A ₁ , A ₁ ′, A ₁ ″ first image line A ₂ , A ₂ ′, A ₂ ″ second image line A ₃ Third image lines E, F, G Observation angles K ₁ , K ₂ , K ₃ Light sources P ₁ , P ₁ ′, P ₁ ″ Image line pitches Q, Q ′, Q ″ Circle centers T ₁ , T ₁ ', T ₁ ″, T ₂ , T ₂ ′, T ₂ ″, T ₃ stroke widths θ ₁ , θ ₁ ′, θ ₁ ″ adjacent angles θ ₂ , θ ₂ ′, θ ₂ ″ second Pitch of

Claims (9)

A latent image printed matter having a print area composed of an information area and a background area adjacent to the information area on a base material, wherein the image changes depending on an observation angle,
The information area and the background area are formed by convex image lines made of a material having a specular gloss,
One of the information area and the background area is formed by arranging a plurality of first image lines having a common circle center at a first pitch with respect to the circle center,
The region different from either one is formed by arranging a plurality of second image lines radially from the same circle center as the circle center , and a plurality of second pitches.
At the boundary between the information area and the background area, the second image line and the first image line are arranged adjacent to each other within an angle range of 60 ° to 120 °,
When observed while tilting the substrate , the light gradation is rotated around the circle center of the second image line and the first image line in both the information area and the background area. A latent image printed matter characterized in that a visible moving image effect is produced and a clear latent image can be visually recognized without any decrease in contrast at the boundary portion when light is incident from any angle.   The latent image printed matter according to claim 1, wherein the first image line is a combination of at least one of an arc-shaped image line, a circular image line, an elliptical arc-shaped image line, and an elliptical image line.   The latent image printed matter according to claim 1, wherein the second image line is a curved line or a straight line.   The latent image printed matter according to claim 3, wherein the straight line or the curved line has the same line width or the line width continuously changes from the center to the outside.   5. The latent image printed matter according to claim 1, wherein the second pitch is an angle formed between the second image lines adjacent to each other with respect to the circle center. 6.   The latent image printed matter according to claim 1, wherein the height of the convex image line is 3 μm or more and 150 μm or less.   The print area includes a first pattern area formed by a difference in an image area ratio between an image line width of the first image line and an image line width of the second image line. Item 7. The latent image printed matter according to any one of Items 1 to 6. The print area has a second pattern area formed by arranging a plurality of third image lines in a first direction and a third pitch,
In the second pattern area, the third image line is arranged adjacent to the second image line and the first image line at the boundary between the information area and the background area. The latent image printed matter according to claim 1, wherein the latent image printed matter is a printed matter.   9. The material according to claim 1, wherein the material having a specular gloss includes at least one of an iris pearl pigment, a scaly mica pigment, a scaly metal pigment, a glass flake pigment, and a cholesteric liquid crystal pigment. The latent image printed matter described in the item.

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