JP6381040B2 - Anti-counterfeit formation - Google Patents

Description

  The present invention relates to an anti-counterfeit forming body in which a latent image appears due to a change in observation angle in the field of valuable printed matter such as banknotes, passports, and securities that require an anti-counterfeit effect.

  Due to the nature of valuable printed matter such as banknotes, passports, and securities, it is required that they are not easily counterfeited or duplicated. However, with recent developments in digital devices such as scanners, printers, and color copiers, it has become possible to easily make elaborate copies of valuable prints. Therefore, in order to prevent duplication and counterfeiting, there are many ones to which an optical security element typified by a hologram whose image changes depending on a printed matter or an observation angle is attached.

  However, since the hologram is formed by using a complicated manufacturing process and a special material, there is a problem that the manufacturing takes time and cost. Therefore, instead of holograms, special light-reflective materials such as metal ink, interference mica, oxidized flake mica, pigment-coated aluminum flakes, and optically variable flakes are used to make the same image changes using ink. In addition, valuable prints have been filed that can be formed by a general printing method that is blended with paints and paints, and uses a combination of special materials or a complicated halftone dot configuration.

  The valuable printed material is also required to have an effect of easily visually observing whether it has been forged or copied. Therefore, anti-counterfeiting technology is known in which the color and shape of an image changes due to a change in observation angle by combining halftone dots or image lines constituting a precious printed matter and unevenness formed by a base material or a heap of ink.

  For example, Patent Document 1 discloses a printed matter in which the color and shape of an image change using the difference in brightness and glossiness from each image and substrate due to a change in observation angle. This printed material gives a latent image of the same color as a transparent or base material formed of a material with high glossiness on the base material, and has a color different from that of the base material formed of a material containing a glittering material thereon. By stacking the visible images, the viewing angle is changed to change the image from the visible image to the latent image so that the visible image is visually recognized.

  For example, Patent Document 2 discloses a printed matter in which the color and shape of an image change by using a blind spot due to an image line that rises when the observation angle is changed. This printed matter gives a first image consisting of a first image line on a substrate, and a second image line having a bulge forming a first background image is arranged adjacent to the first image line. Furthermore, the image is changed from the visible image to the latent image by changing the observation angle by stacking the third image line having a bulge that forms the second image on the second image line. And is visually recognized.

JP 2014-042991 A JP 2014-136324 A

  The technique described in Patent Document 1 has an image formed of a glittering material. However, since the glittering material is very expensive, the cost of the printed matter increases. Further, since the appearance of the latent image uses only the brightness difference and the gloss difference from each image and the substrate, there is a problem that the contrast of the latent image that appears when the observation angle is changed is low. . The latent image uses only one type of ink that is transparent or the same color as the base material, and there is a limit to the gradation expression of the latent image, so the latent image has a wide gradation range and high design properties. It is difficult to form an image.

  In the technique described in Patent Document 2, a visible image is shielded and a latent image appears when a viewing angle is changed. Therefore, an image line arranged adjacent to the visible image needs an appropriate image line height. is there. In order to provide the image line height, it is necessary to load the image line that shields the visible image and the image line that forms the latent image as a swelled shape, and as a result, the density of the latent image increases. Therefore, the image becomes dark as a whole, and the separation between the latent image and the background portion becomes ambiguous. In addition, since the contrast of the latent image is lowered, a printed material that allows a latent image having a higher gradation to appear is desired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a printed matter that uses a general colored ink and causes a latent image having a higher contrast and better visibility than the prior art to appear by changing the observation angle.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a printing area on at least a part of the substrate, and the printing area has a 1a line and a 1a image of a different color from the substrate. The first image line composed of the 1b image lines arranged at positions that do not overlap the line is arranged in a color different from the base material on the first image that is regularly arranged in the first direction. A second image comprising at least a second image line having a bulge arranged regularly in the first direction is stacked, and the first image has a different image area ratio per unit area Therefore, the first image line has a bright and dark flip-flop property due to the smooth surface of the image line, and the second image line is light transmissive under diffuse reflected light. And the lightness is the same as or higher than that of the first image line, the lightness under specular reflection light is lower than that of the first image line, The first image and the second image are changed and visually recognized by changing the observation angle by being stacked on the image line of the first a with a line width of the image line of the a or less. It is a forgery prevention formed body.

  According to a second aspect of the present invention, in the forgery prevention formed body according to the first aspect, the image line height of the second image line is made different depending on the density of the original image of the second image. The second image has a gradation.

  Furthermore, the invention according to claim 3 is the anti-counterfeit forming body according to claim 2, wherein at least a part of the 1a image line on which the second image line is not laminated is used to reduce the gradation of the second image. It is characterized by forming a part.

  The formed body in the configuration of the present invention as described above is capable of appearing a latent image with high contrast and excellent visibility by using the shadow of the image line having the brightness difference and the swell of each image. Become. Further, since a general colored ink is used, it can be manufactured at a low cost.

The top view which shows a forgery prevention formation body (S), and the enlarged view of a latent image. The schematic diagram explaining a 1st image (A). The figure which shows an example of an image line. The figure explaining the arrangement | positioning relationship of the 1a drawing line and the 1b drawing line. The figure explaining the pattern part constituted by changing the area ratio The schematic diagram which shows an observation state. The schematic diagram explaining a 2nd image (B). The schematic diagram explaining the shadow effect. The schematic diagram which shows the lamination | stacking state of each image (A, B). The schematic diagram at the time of observing a formation body (S) from the 1st observation angle (E1). Schematic when the formed body (S) is observed from the second observation angle (E2) The schematic diagram explaining the formation body (S) of a modification. The schematic diagram at the time of observing the formation body (S) of a modification from under regular reflection light (E2).

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

  FIG. 1A is a plan view showing an anti-counterfeit formed body (hereinafter referred to as “formed body”) (S) in the present invention, and the formed body (S) is printed as a characteristic point of the present invention. The region (Z) is formed on at least a part of the substrate (1). FIG. 1B is an enlarged view of the print area (Z).

  The formed body (S) of the present invention is, for example, valuable printed matter such as banknotes, passports and identification cards, and cards such as cash cards, and FIG. 1A is a card as an example. The formed body (S) includes a printing region (Z) at least partially on the substrate (1), which is a medium that can be printed on the surface of paper, a plastic card, and the like. The image (A) and the second image (B) are overlapped. The material of the substrate (1) is not particularly limited, such as high-quality paper, coated paper, plastic and metal. The formed body (S) has a latent image that becomes visible by a change in the observation angle. Hereinafter, the configuration will be described in detail.

  FIG. 2A is a plan view for explaining the first image (A). The first image (A) is a symbol that becomes visible when observed from the front with respect to the substrate (1). The first image (A) is divided into a background portion (2) that forms a uniform pattern and a pattern portion (3) that forms a pattern by varying the line area ratio per unit area. In FIG. 2A, the pattern portion (3) is a pattern of numbers and flowers. However, the pattern portion (3) is not limited to this, and can be a free pattern such as a character, a mark, or a pattern.

  The first image (A) is observed with a constant density by the background portion (2) forming a uniform pattern. The pattern portion (3) is darker than the background portion because both the image line forming the background portion (2) and the image line forming the pattern portion (3) can be observed. For this reason, the pattern portion (3) is observed as a dark pattern (in FIG. 2A, a pattern of numbers and flowers) in an image having a constant density. Although explanation is omitted, it is also possible to display a light pattern in an image having a constant density. In this case, if a part other than the pattern (negative image) is formed as a pattern in the pattern part (3). Good. Details of each part will be described below.

  FIG. 2B is an enlarged view of a part of the region (P) in FIG. The background part (2) of the first image (A) has a plurality of 1a image lines (4a) regularly arranged in the first direction (X1) at the first pitch (D1). Become. The first pitch (D1) is appropriately set within the range of 100 μm or more and 1500 μm or less in consideration of the printing method and the line width (W1) of the 1a-th line (4a).

  FIG. 3 is a diagram illustrating an example of an image line. The image line is a known image line such as a straight line, a sine wave, a triangular wave, a sawtooth wave, or a rectangular wave as shown in FIGS. 3 (a), 3 (b), 3 (c) and 3 (d). That's it. Further, as shown in FIGS. 3E, 3F, 3G, 3H, 3I, and 3J, a circular shape, a polygonal shape, and a character shape are used. A pixel in which the pixels and the dots are configured in a linear shape is also an image line in the present invention.

  Since a plurality of first-a drawing lines (4a) constituting the background part (2) are arranged, in the case of a straight line with a constant line width as shown in FIG. Observed at a constant concentration. Further, in the case of the curves as shown in FIG. 3B and FIG. 3C, a portion where the image line becomes dense periodically is generated, so that it is felt that the periodic density difference is very small. Furthermore, even in the case of a pixel having a design property as shown in FIGS. 3 (i) and 3 (j), a slight difference in density is felt and not a uniform pattern but a grainy pattern is observed. . The uniform pattern in the present invention includes the case where the density difference is clearly observable by dividing the pattern portion (3) including these. In the present invention, the image line will be described as a linear image line shown in FIG.

  When the first pitch (D1) is less than 100 μm, the formed body (S) of the present invention may affect the reproducibility of printed image lines in a general printing method, and the image is clearly visible. Since it becomes impossible, it is not preferable.

  Conversely, when the first pitch (D1) exceeds 1500 μm, it is not preferable because details (details) of the first image (A) and the second image (B) described later cannot be formed.

  In FIG. 2 (b), the first pitch (D1) is shown as a constant pitch, but it is also possible to use a partially different pitch as long as it is within the aforementioned pitch range.

  The line width (W1) of the 1a line (4a) may be set as appropriate because the line area ratio varies depending on the uniform density expressed by the background part (2). Increasing the density of the background portion (2), that is, increasing the image area ratio per unit area, affects the gradation expression of the pattern portion (3) described later, and improves the visibility of the first image (A). Since there is a possibility of hindering, it is preferable that the line area ratio per unit area of the background portion (2) is at most 80%.

  Further, if the density of the background portion (2) is reduced, that is, the image area ratio per unit area is reduced, a desired brightness increase cannot be obtained when a second image (B) described later is observed, Since the visibility of the second image (B) may be hindered, the image area ratio per unit area of the background (2) is preferably at least 30%.

  For example, when it is desired to set the image area ratio per unit area of the background portion (2) to 40%, the image line width (W1) is set to 400 μm when the first pitch (D1) is set to 1000 μm. Further, when the first pitch (D1) is set to 500 μm, the image line width (W1) may be set to 200 μm.

  The image line height (h1) of the 1a image line (4a) varies depending on the printing method. For example, in the case of general offset printing, it is about 1 to 2 μm. On the other hand, in the screen printing method with ink, it may be 20 μm or more. In the present invention, when observing a second image (B) to be described later, it should be as small as possible so as not to affect the visibility of the image, and it is more preferably formed with a thickness of 10 μm or less.

  Next, the pattern part (3) of the first image (A) will be described. In FIG. 2 (b), the pattern portion (3) of the first image (A) has the 1b image line (4b) between the 1a image lines (4a) forming the background portion (2). By arranging a plurality, a difference in the image area ratio per unit area is generated, so that numbers and floral designs are visually recognized. In the present invention, the arrangement position and pitch (D2) of the 1b image line (4b) are not limited, and may be formed on a substrate on which the 1a image line (4a) is not formed.

  The “image area ratio” in the present invention refers to the ratio of the area of the image line to the fixed area of the substrate (1). As shown in FIG. 4A, by arranging a plurality of 1b image lines (4b) between the 1a image lines (4a) forming the background portion (2), the inside of the square surrounded by the dotted line The stroke area ratio is different.

  For example, when the 1b image line (4b) is arranged in the middle of the plurality of 1a image lines (4a) (FIG. 4 (a)), When placed in contact with the line 1a (4a) (FIG. 4B), when placed close to the line 1a (4a) (FIG. 4C), 1a The image line (4a) may be arranged arbitrarily in contact with both sides of the image line (4a) (FIG. 4 (d)), or even randomly arranged (FIG. 4 (e)).

  In FIG. 2, the 1b image line (4b) expresses the symbol by a straight line of a certain length, but is not limited to a straight line, and as described with reference to FIG. A pattern may be expressed using the same drawing line as the line (4a). Further, a gradation pattern such as a landscape or a face image may be expressed by using a method of changing the dot area ratio used in general printing.

  For example, when the 1b image line (4b) is a straight line of a certain length according to the design (FIG. 5 (a) represents a positive image, FIG. 5 (b) represents a negative image), the 1b image line When the line width of the line (4b) is changed according to the pattern (FIG. 5C), when the line width of the line 1b (4b) is continuously changed according to the pattern ( 5 (d)), when the image area of the 1b line (4b) is adjusted according to the pattern (FIG. 5 (e)), the arrangement density of the 1b image line (4b) according to the pattern For example, an arbitrary gradation expression method may be used when the image is adjusted (FIG. 5F).

  FIG. 2C is a cross-sectional view taken along the line X-X ′ in FIG. The image line width (W2) and image line height (h2) of the 1b image line (4b) are determined in consideration of the first pitch (D1) and the image line widths of other image lines. ) Is appropriately set within a range of 30 μm to 1200 μm, and the image line height (h2) is 10 μm or less.

  If the line width (W2) of the 1b image line (4b) is less than 30 μm, the general printing method may affect the reproducibility of the print image line, and the image cannot be clearly seen. It is not preferable. As will be described later, the image quality is also affected when the second image (B) is formed.

  On the contrary, when the line width (W2) of the 1b image line (4b) exceeds 1200 μm, the details (details) of the first image (A) and the second image (B) described later cannot be formed. Therefore, it is not preferable.

  Further, it is preferable that the line width (W2) of the 1b image line (4b) is appropriately set within the range of the image line width (W1) of the 1a image line (4a). When the image line width (W2) of the 1b image line (4b) is larger, the disappearance effect of the first image (A) due to the bright and dark flip-flop property under the specular reflection light described later cannot be obtained. This is not preferable because a clear image switching effect may not be obtained due to a change in observation angle.

  When the image height (h2) of the image line (4b) of the 1b exceeds 20 μm, the visibility of the image is affected when the second image (B) described later is observed, which is not preferable.

  The 1a image line (4a) and the 1b image line (4b) (hereinafter referred to as the 1st image line (4)) are printed on the substrate (1) by a known printing method, for example, a lithographic plate. It is formed by printing using a printing plate, ink, or the like suitable for each printing method by printing, intaglio printing, inkjet printer, or the like.

  The color of the first image line (4) under diffuse reflected light is not particularly limited, but a color that can be clearly distinguished from the surface color of the substrate (1) is preferable. For example, when the surface color of the base material (1) is a color having high brightness such as white or cream, and the first image line (4) is formed of a color material having high brightness such as yellow, the base material (1 ) And the first image line (4) are not preferable because they are difficult to distinguish. Further, as will be described later, since the visibility of the second image (B) becomes higher when the brightness difference is larger between the specular reflection light and the diffuse reflection light, the color of the first image line (4) is A color with high brightness under diffuse reflection is not preferable.

  The first image line (4) needs to have higher brightness under regular reflection light than under diffuse reflection light. This is because the brightness of the first image line (4) is increased under regular reflection light, so that the background part (2) and the pattern part (3) of the first image (A) are not separated. This is because such a pattern is visually recognized.

  In other words, the first image line (4) needs to have light and dark flip-flop properties. Without this bright and dark flip-flop, the pattern (3) of the first image (A) that can be observed under diffuse reflected light is a uniform pattern similar to the background (2) under regular reflected light. As a result, the effect of erasing the image is reduced, so that the switch effect of the image that clearly switches between the diffuse reflection light and the regular reflection light may be lost, which is not preferable.

  Note that the hues of the 1a image line (4a) and the 1b image line (4b) may be different. This is because even if the hue of each image line is different, if it has light and dark flip-flop properties, it becomes difficult to perceive a hue difference due to an increase in brightness, and an image disappearance effect under specular reflection light can be obtained. Because. Therefore, when making the hues different, the smaller the hue difference is, the easier it is to obtain an image disappearance effect under specular reflection light. Moreover, the disappearance effect is more easily obtained as the brightness increase under specular reflection light is larger.

  The “light / dark flip-flop property” as used in the present invention refers to a characteristic in which the color tone hardly changes and only the brightness changes under diffuse reflection light and regular reflection light. In addition, the “state in which the brightness increases under regular reflection light” refers to a state in which incident light is strongly reflected on the printed image line, and greatly depends on the smoothness of the surface of the image line and the reflection characteristics of the pigment. For example, by using an ink that allows the varnish component to be fixed smoothly, the smoothness of the surface of the image becomes high and a large increase in brightness is caused. In addition, ink containing a glittering material such as an aluminum pigment also reflects light efficiently under regular reflection light, resulting in a large increase in brightness.

  In the present invention, the first image line (4) has a bright and dark flip-flop property by producing gloss due to the smooth surface of the image line. In the present invention, “the surface of the image line is smooth” refers to a state in which the image line has a gloss resulting from the smoothness of the surface without depending on the reflection characteristics of the pigment. In the specular gloss measurement method specified in JIS Z8741, this refers to a state where the gloss value is 10 or more when the incident angle is measured at 60 degrees (GS (60 °)). The gloss value will be described in detail in Table 1.

（○：消失効果あり、△：消失効果は低い、×：消失効果なし）

(○: Disappearing effect, △: Disappearing effect is low, ×: Disappearing effect)

  For the first image (A) shown in FIG. 2, five types of samples having different image line smoothness were prepared. The 1a image line (4a) was formed in a straight line shape with an image line width (W1) of 210 μm and a first pitch (D1) of 460 μm. The image line height (h1) varies depending on the sample, and is in the range of 1 to 10 μm. The 1b image line (4b) was arranged so as to be adjacent to the 1a image line (4a) with an image line width of 60 μm to form numbers and flower patterns. Moreover, the black color material was used for the color material which forms the 1st image line (4).

  Table 1 shows the results of measuring the gloss of the first image (A) formed by the 1a image line (4a) and the 1b image line (4b) and the image disappearance effect. For the measurement, a gloss meter (by micro gloss manufactured by BYK Gartner, Inc., the incident angle is 60 °) was used.

  As shown in Table 1, the gloss value of Sample 1 was low, and no image disappearance effect was obtained at the second observation angle (E2). Sample 2 is not preferable because the image disappearance effect is low and the first image (A) is slightly shaded. For samples 3, 4 and 5, an image disappearance effect was obtained, and a uniform pattern could be observed at the second observation angle (E2). Therefore, in the present invention, when the gloss value is 10 or more, a satisfactory image disappearance effect can be obtained.

  The “lightness” in the present invention is the degree of brightness and darkness of a color, and high brightness indicates a bright color. In addition, it is preferable that the brightness difference of the 1st image line (4) under regular reflection light and diffuse reflection light is 10 or more. For example, a variable angle spectrophotometer that can change the angles of the light source and the light receiver with respect to the sample may be used to measure the difference in brightness between the specular reflection light and the diffuse reflection light. When the brightness difference is 10 or less, it is difficult to perceive a color difference between the regular reflection light and the diffuse reflection light, which affects the visibility of the second image (B), which is not preferable.

  The term “regular reflection” as used in the present invention refers to a phenomenon in which, when light is incident on a substance at a certain incident angle, strong reflected light is generated at an angle substantially equal to the angle of the incident light. The term “phenomenon” refers to a phenomenon in which, when light is incident on a substance at a certain incident angle, weak reflected light is generated at an angle different from the angle of the incident light. Taking an iris pearl ink as an example, it appears colorless and transparent under diffuse reflection light, but emits a specific interference color under regular reflection light.

  As used in the present invention, “observation under diffuse reflected light” refers to a state in which observation is performed at an angle greatly different from the angle of light incident on the printed material, as shown in FIG. A state in which observation is performed from directly above or a state in which the observation angle is small. Further, “observation under specular reflection light” refers to a state in which observation is performed with a viewpoint at a reflection angle substantially equal to the angle of light (light source L) incident on the printed matter, as shown in FIG. 6B. . Although there is no limitation on the angle of the incident light, it is suitable to observe the second image (B) by observing at 45 ° or more because the increase in brightness is large and the shadow effect due to the image line height is also large. ing. Thereafter, the state observed under the diffusely reflected light in FIG. 6A is observed at the first observation angle (E1), and the state observed under the regular reflected light in FIG. This is expressed as observation at an observation angle (E2).

  Next, the second image (B) that is formed over the first image (A) will be described. FIG. 7A is a plan view for explaining the second image (B). The second image (B) is an image that becomes visible when observed at the second observation angle (E2) with respect to the base material (1). In addition, in FIG. 7A, although it is set as a numerical design, it is possible to make it a design such as a character, a figure, a pattern, and the like.

  FIG. 7B is an enlarged view of a part of the region (P) in FIG. 7A, and a cross-sectional view taken along the line X-X ′ is FIG. 7C. Further, FIG. 7D is a cross-sectional view taken along line Y-Y ′ of FIG. 7B, FIG. 7C, and FIG. 7D, the first image line (4) is illustrated by a dotted line in order to show the stacked state of the second image line (5). To do.

  In the second image (B), the second image line (5) having a bulge has a third pitch (D3) in the same first direction (X1) as the direction in which the first image line (4) is arranged. ) Are regularly arranged. As shown in FIGS. 7B, 7C, and 7D, the second image line (5) is stacked on the 1a image line (4a). It is also possible to stack the second image line (5) on the 1b image line (4b), but in this case, when confirmed at the second observation angle (E2), Because of the shadow effect of the second image line (5) arranged on the image line (4a), the second image line (5) arranged on the first image line (4b) may not be visible. Is not preferable.

  As described above, since the second image line (5) is formed on the 1a image line (4a), the third pitch (D3) to be arranged is an integral multiple of the first pitch (D1). Is set as appropriate. Hereinafter, the third pitch (D3) will be described as the same pitch as the first pitch (D1).

  The image line width (W3) of the second image line (5) is appropriately set within the range of the image line width (W1) of the 1a image line (4a). If the line width (W3) of the second image line (5) exceeds the image line width (W1) of the 1a image line (4a) arranged below, the second image line (5) Since it will be formed on a material and the 2nd image (B) is visually recognized as an image mixed with the 1st image (A), it is not preferable.

  The image height (h3) of the second image line (5) having a rise is appropriately set within a range of 10 to 150 μm.

  When the image height (h3) of the second image line (5) is less than 10 μm, it is difficult to obtain a shadow effect when observed at the second observation angle (E2), and the second image (B) This is unfavorable because it affects the visibility.

  When the image height (h3) of the second image line (5) exceeds 150 μm, the visibility when observed at the second observation angle (E2) is improved, but the durability of the image line deviation or chipping is improved. There is a possibility that the property may deteriorate, which is not preferable.

  The second image line (5) having a bulge is formed on the substrate (1) by performing planographic printing and relief printing using a bulging material such as foamed ink as ink. As another forming method, intaglio printing and stencil printing, or an ink jet printer capable of printing an image line having a bulge is formed.

  In the present invention, the second image (B) is not visible at the first observation angle (E1), and only the first image (A) is visible. Therefore, the color material forming the first image line (4) and the second image line (5) will be described.

  As described above, at the first observation angle (E1), the second image line (5) stacked on the 1a image line (4a) is made invisible and used for these image lines. The color material has the same hue, and the color material forming the second image line (5) has higher light transmittance than the color material forming the 1a image line (4a), and the first observation angle. The condition is that the lightness of the second image line (5) in (E1) is equal to or greater than the lightness of the color material forming the 1a image line (4a).

  For example, when the 1a image line (4a) is formed of a blue color material, the 2nd image line (5) has higher lightness and light transmittance than the 1a image line (4a). In this case, when observed at the first observation angle (E1), the blue color of the second image line (5) is the same as that of the 1a image line (4a). The second image line (5) cannot be visually recognized because it is transmitted and absorbed in blue.

  However, in the case where the lightness of the 1a image line (4a) is low and the light transmittance is extremely low (because the concealing action is high, the density is not affected by the film thickness even when laminated), Even if the color material of the second image line (5) is the same as the color material of the 1a image line (4a), the second image line (5) cannot be visually recognized at the first observation angle (E1). It becomes. For example, when a black color material having a high concealing action is used for the 1a image line (4a), even if the same black color material is used for the second image line (5), the first observation angle (E1) Then, the second image line (5) cannot be visually recognized.

  When the second image line (5) is a color material having extremely high brightness and light transmittance (because it is translucent, the density is low even when laminated), the image of the first image line (5a) is displayed. Even when a color material (for example, light blue, light yellow, light red, etc.) having a hue different from that of the line (4a) is used and observed at the first observation angle (E1), the image line (4a) of the first a As a result, the second image cannot be observed. The color combination is not particularly limited as long as it is a color combination in which the second image line (5) on the 1a image line (4a) cannot be visually recognized.

  In addition, “light transmittance” in the present invention refers to the property that irradiated light (visible light) passes through a color material forming an image line, and “high light transmittance” in the present invention means When printing on a base material using a color material having a color different from that of the base material, the color material transmits light and the base material color in the lower layer is observed. In addition, “low light transmission” means that the color material absorbs light when printed on the base material using a color material having a different color from the base material, so that the color material is not the underlying base material. The color is observed.

  In the present invention, “transmission absorption” means that a color material having lower lightness is formed under a color material having high light transmittance, and a portion where the two color materials are laminated is a first observation angle ( When visually recognized from E1), it means that a color material with high light transmittance becomes indistinguishable or difficult due to a color material with low brightness.

  At the second observation angle (E2), the brightness of the second image line (5) needs to be lower than the brightness of the 1a image line (4a). This is to make the second image (B) visible due to the brightness difference of each image line at the second observation angle (E2). In order to visually recognize the second image (B), it is sufficient that the first image line (4a) and the second image line (5) can be divided and visually recognized, and the brightness difference for that purpose may be 10 or more. Furthermore, since the second image line (5) has a height, the brightness is felt even lower due to the shadow effect at the time of inclination. Therefore, at the time of observation at the second observation angle (E2), the second image (B) can be visually recognized due to both the shadow effect and the brightness difference due to the light reflection characteristics.

  The “shadow effect” in the present invention will be described with reference to FIG. FIG. 8A is a diagram showing a case where the forgery prevention formed body (S) of the present invention is observed at the first observation angle (E1). For convenience of explanation, the 1a image line (4a) and the 2nd image line (5) are displayed in different colors, but each image line is actually observed when observed at the first observation angle (E1). Cannot be observed separately. FIG. 8B is a cross-sectional view (XX ′ cross-sectional view) of the portion where the second image line (5) is stacked on the 1a image line (4a), and FIG. FIG. 8C shows a cross-sectional view (YY ′ cross-sectional view) of a portion where the second image line (5) is not stacked thereon.

  As shown in the figure, since the second image line (5) has a height, when it is observed at the second observation angle (E2), the visible surface area of the second image line (5) is small. Further, by concealing the base material in the lower layer and the 1b image line (4b), the second image line (5) portion is observed deeply. This effect is referred to as a “shadow effect” in the present invention. FIG. 8D shows a schematic diagram when observed at the second observation angle (E2). When observed at the second observation angle (E2), the portion where the second image line (5) is laminated is observed dark (dark), and the non-stacked portion has increased brightness as described above. It is brightly observed.

  Fig.9 (a) is a schematic diagram which shows the lamination | stacking order of the 1st image (A) with respect to a base material (1), and a 2nd image (B). As shown in FIG. 9A, the first image (A) is formed in the print area (Z) on the base material (1), and the second image is formed on the first image (A). (B) overlaps and is formed.

  Note that the overlap of the first image (A) and the second image (B) means that the images overlap each other and does not mean that the image lines constituting each image all overlap.

  FIG. 9B is a schematic diagram showing an enlarged view of a partial region (P) in FIG. 9A, and FIG. 9C is a cross-sectional view taken along XX ′ in FIG. 9B. It is sectional drawing. In addition, FIG.9 (b) shows the state by which all the images (A, B) were laminated | stacked on the base material (1).

  As shown in FIGS. 9B and 9C, the second image line (5) forming the second image (B) is the first image forming the first image (A). The line width is equal to or smaller than the line width of the line (4a), and is stacked on the 1a line (4a).

  Next, the visual recognition state of the formed body (S) having the above configuration will be described. FIG. 10A is a schematic view when the formed body (S) is observed at the first observation angle (E1) with respect to the base material (1), and FIG. FIG. 10C is an enlarged view of a partial region (P) in a), and FIG. 10C is a cross-sectional view taken along the line XX ′ in FIG.

  Since the observation angle at the first observation angle (E1) with respect to the formed body (S) and the observation angle at the first observation angle (E1) with respect to the base material (1) are the same, hereinafter the base material (1) is omitted, and the formed body (S) is observed at the first observation angle (E1), and the other observation angles are the same.

  The color material that forms the first image line (4) has lower brightness and light transmittance than the color material that forms the second image line (5) arranged in a stacked manner, and the first image line (4a) ) Is equal to or larger than the image width (W3) of the second image line (5). Therefore, when the image line width (W1) is observed at the first observation angle (E1), the first image line (4) ) Becomes visible and the first image (A) is visually recognized.

  That is, the color of the second image line (5) formed in the upper layer is transmitted and absorbed by the first image line (4a) formed in the lower layer, and the two image lines cannot be distinguished and visually recognized with the naked eye. Thus, the first image (A) composed of the plurality of first image lines (4) arranged in the lower layer is visually recognized.

  As described above, when the formed body (S) is observed at the first observation angle (E1), as shown in FIG. 10A, the first image (A) is caused by the difference in the line area ratio per unit area. Becomes visible.

  Next, the case where the formed body (S) is observed at the second observation angle (E2) will be described. FIG. 11A is a schematic view when the formed body (S) is observed at the second observation angle (E2), and FIG. 11B is a partial region (P) in FIG. 11 (c) is a cross-sectional view taken along the line XX 'in FIG. 11 (b), and FIG. 11 (d) is a cross-sectional view taken along the line YY' in FIG. 11 (c). It is sectional drawing cut | disconnected.

  As shown in FIG. 11 (c), when the formed body (S) is observed at the second observation angle (E2), the first image line (4) having bright and dark flip-flop properties is the background portion (2). Since the pattern portion (3) is visually recognized as a uniform pattern, a uniform and bright image is obtained. On the other hand, the portion formed by the second image line (5) has a difference in brightness from the portion formed by the first image line (4), and therefore, a plurality of portions are formed at the second observation angle (E2). A second image (B) consisting of the second image line (5) is visually recognized.

  In addition to the above-described brightness difference, the second image line (5) is arranged on the 1a image line (4a) so as to be raised as shown in FIG. 7 (d). Therefore, a part of the base material (1) and the 1b image line (4b) in the lower layer are concealed by the second image line (5) and visually recognized by the hue of the second image line (5). Then, the second image (B) composed of the plurality of second image lines (5) is visually recognized.

  Therefore, when the formed body (S) is observed at the second observation angle (E2), as shown in FIG. 11 (a), a contrast with a clearer contrast is obtained due to two effects of the brightness difference and the shadow effect. The second image (B) is visually recognized.

  As described above, the formed body (S) of the present invention switches between the first image (A) and the second image (B) by using the brightness difference and shading effect of each image line due to the change in the observation angle. It is visually recognized. The first image (A) and the second image (B) can have different colors and shapes by having a multilayer structure, and are excellent in design. Therefore, the formed body (S) of the present invention not only makes it possible to easily determine the authenticity of the formed body (S) by visual observation, but also a latent image that has better design than conventional ones. The formed body (S) to which is given.

  As described above, the first image (A) can be given gradation by changing the line area ratio per unit area, but in the second image (B), the second image The gradation can be given by changing the line height (h3) of the line (5). Which position of the second image line (5) is to be set to what height may be arranged corresponding to the density of the original image of the second image (B) to be formed.

  Furthermore, in order to make the gradation width of the second image (B) wider, not only the image line height (h3) of the second image line (5) but also the brightness of the image line (4a) of the 1a. The brightness difference due to the flip-flop property can also be used.

  For example, in FIG. 12 (a), the second image (B) is a female image. In this female image, a portion having a difference in density, such as a hair portion and a shadow portion of the nose, The stroke height (h3) of the stroke 2 (5) of 2 is varied. Further, the skin portion with the lightest density in the female image is formed by the 1a image line (4a) on which the second image line (5) is not laminated.

  When this image is observed at the second observation angle (E2), the density due to the shadow effect of the second image line (5) is applied to portions where the image line height (h3) of the second image line (5) is different. There is also a difference, and the portion where the image line height (h3) is high is visually recognized with a higher density.

  Further, the portion formed by the 1a-th image line (4a) where the second image-line (5) is not stacked has high brightness due to the light / dark flip-flop property of the 1a-th image line (4a), and Since the portion where the second image line (5) is laminated appears to be darker due to the shadow effect of the second image line (5), a latent image having a higher contrast than the conventional image can be visually recognized.

  That is, the second image line (5) is placed on the portion formed by the 1a image line (4a) where the second image line (5) is not stacked, and the 1a image line (4a). The part to be stacked and the image height (h3) of the second image line (5) are appropriately set according to the density of the original image of the second image (B) to be formed.

  In the present invention, “corresponding to the density of the original image of the second image (B)” means that when the second image (B) to be formed has gradation, a density difference occurs in the image. Therefore, in accordance with the density difference, a portion formed by the first image line (4a) where the second image line (5) is not laminated, a portion formed by the second image line (5), It also means determining the image height (h3) of the second image line (5). That is, for the position where the density of the second image (B) is light, the second image line (5) is not stacked on the image line (4a) of the first a, or the image line of the second image line (5). The height (h3) is decreased, and conversely, at the position where the density is high, the image line height (h3) of the second image line (5) is increased.

  A modified example of the formed body (S) will be described. FIG. 12 is a plan view illustrating a second image (B) in the modification. In FIG. 12A, only the second image (B) is shown, and it is a female image created using computer graphics. It can be an image.

  FIG. 12B is an enlarged view of a part of the region (P) in FIG. 12A, and a cross-sectional view taken along the line X-X ′ is FIG. Further, FIG. 12D is a cross-sectional view taken along line Y-Y ′ of FIG. In FIGS. 12B, 12C, and 12D, the first image line (4) is illustrated by a dotted line in order to show the stacked state of the second image line (5). To do. In addition, a part of the description of the portion overlapping with the above-described formed body (S) is omitted.

  As shown in FIGS. 12C and 12D, the first image line (4a) in which the second image line (5) is not stacked corresponding to the density of the second image (B). ) And a portion where the second image line (5) is laminated on the 1a image line (4a). Further, at the position where the density of the second image (B) is high, the image height (h3) of the second image line (5) is high, and conversely, at the position where the density of the second image (B) is low. The image height (h3) of the second image line (5) is low.

  The image line height (h3) of the second image line (5) expressing the gradation of the second image (B) can be set to 150 μm or less as in the above-described formed body (S). preferable.

  Moreover, it is also possible to change the image line height (h3) by stacking a plurality of second image lines (5). Specifically, at a position where the density of the image is high, the number of the second image lines (5) is increased to increase the total image line height (Th), and conversely, the second image (B). In a position where the density of light is low, the number of the second image lines (5) is decreased, and the total image line height (Th) is decreased.

  This will be described in detail with reference to FIG. FIG. 13A is a schematic diagram when the formed body (S) is observed at the second observation angle (E2). FIG. 13B is an enlarged view of a part of the region (P) in FIG. 13A, and cross-sectional views taken along the line X-X ′ are shown in FIGS. 13C and 13D. When the second image line (5) is a single layer, it is as shown in FIG. When observed at the second observation angle (E2), the portion formed by the 1a image line (4a) on which the second image line (5) is not laminated is the brightness of the 1a image line (4a). The lightness is increased due to the flip-flop property, and the portion where the second image line (5) is laminated is observed to have a high density due to the shadow effect of the second image line (5). Further, the second image line (5) has a different image line height (h3), so that the higher the image line height (h3) of the second image line (5), the higher the density. Since the lower the image line height (h3) of the image line (5), the lower density is observed, and therefore the second image (B) with gradation is observed.

  When the number of layers of the second image line (5) is different, as shown in FIG. 13 (d), the second image line (4a) stacked on the base material (1) is second. A plurality of the image lines (5) are stacked. The image lines stacked in order from the 1a image line (4a) side are the 2nd image line (5-1), the 2nd image line (5-2),. 2- (n-1) image line (5- (n-1)) and 2-n-th image line (5-n) (n is an integer of 3 or more). Note that the image line heights of the second image lines (5-1 to 5-n) may be the same or different.

  As for the second image line (5) laminated in order to give gradation, the 2-1 image line (5-1) arranged in the lowermost layer is the second image line (5). The image line width (W2) is the widest among the image lines, and the image lines from the line 2-2 (5-2) to the line 2-n (5-n) are sequentially stacked thereon. The line width (W2) is equal to or smaller than the image line width (W2) of the image line arranged below each image line. By forming in this way, the image line formed by stacking can be stacked without protruding from the lower layer image line, and can be visually recognized when viewed from the front with respect to the base material (1). The first image (A) is not affected.

  Each of the second image lines (5-1 to 5-n) stacked in order to provide gradation has an image line height (h3) of the third pitch (D3) and the image of the first a. Considering the line width and line height of the line (4a) and the second line (5), the line height (h3) is 1 to 150 μm, as with the second line (5). The total image line height (Th) is set to 150 μm or less.

  The color materials of the second image lines (5-1 to 5-n) that are stacked in order to provide gradation are the same as those in the above-described embodiment, and the first observation angle (E1). When observed, it must be in a state where it cannot be observed separately. Furthermore, it is preferable to use a color material having higher brightness and light transmission than the color material of the lower layer for each layer because it is difficult to observe separately. Also, if the lightness of the color material of the 1a image line (4a) is low and the light transmittance is extremely low, as described above, it is difficult to separate and observe even if the same color material is laminated. You may use the same color material as the 1a image line (4a).

  As described above, even when a plurality of second image lines (5) are stacked, when the formed body (S) is observed at the second observation angle (E2), the total image line height (Th ), The density of the second image line (5) is also observed to be high.

  As described above, the difference between the line height (h3) of the second line (5) and / or the total line height (Th), and the light / dark flip-flop property of the line 1a (4a). By using the difference in brightness, it is possible to add gradation to the second image (B), so in addition to the effect of changing the image due to the change in the viewing angle, it should have a higher design. Is possible.

  Hereinafter, the present invention will be described more specifically with reference to Example 1, but the present invention is not limited thereto. As Example 1, a formed body (S) having a two-layer structure shown in FIG. The substrate (1) was a coated paper for printing.

  The 1a image line (4a) was formed into a straight line having an image line width (W1) of 210 μm and an image line height (h1) of 5 μm, and the first pitch (D1) was formed to be 460 μm. The 1b image line (4b) was arranged so as to be adjacent to the 1a image line (4a) with an image line width of 60 μm to form numbers and flower patterns. The color material forming the first image line (4) is black (Liojet FV03Black manufactured by Toyo Ink Manufacturing Co., Ltd.), and the brightness difference between the first observation angle (E1) and the second observation angle (E2). Is 120 (measured with a variable angle spectrophotometer (GSP-2 type: manufactured by Murakami Color Research Laboratory Co., Ltd.), and the measurement conditions were an incident angle of 0 °, an incident angle of 45 °, and an incident angle of 45 ° and an incident angle of 45 °). It was.

  The second image line (5) having a swell was formed into a straight line having an image line width (W3) of 160 m and an image line height (h3) of 50 μm, and the third pitch (D3) was formed to be 460 μm. The color material forming the second image line (5) is also the same black as the color material forming the first image line (4) (Liojet FV03Black manufactured by Toyo Ink Manufacturing Co., Ltd.), and the second observation angle ( The brightness difference from the first image line (4) in E2) was measured with 28 (angle-change spectrophotometer (GSP-2 type: manufactured by Murakami Color Research Laboratory Co., Ltd.)). And an incident angle of 45 ° and a light receiving angle of 45 °).

  The first image line (4) and the second image line (5) are printed on the base material (1) by using a UV ink jet printer ("Patterning JET" manufactured by Tritech) using two color materials. To form.

  When the formed body (S) produced in Example 1 was observed at the first observation angle (E1), the number “123” as the first image (A) and the flower design were visible in black. Next, when the formed body (S) was observed at the second observation angle (E2), the design of the number “456” as the second image (B) was visually recognized in black.

  As Example 2, the second image (B) of Example 1 is the first image line (4a) in which the second image line (5) is not stacked and the image line height corresponding to the gradation ( A formed body (S) constituted by the second image line (5) having h3) was produced. Only the parts different from the first embodiment will be described below.

  The first image line (4) is formed using the same configuration as that of the first embodiment, and the second image line (5) is laminated corresponding to the density of the original image of the second image (B). A portion to be formed by the 1a image line (4a) which is not formed and a portion where the second image line (5) is laminated on the 1a image line (4a) are determined. In addition, the second image line (5) having a swell corresponds to the image line width (W31) of the 2-1 image line (5-1) corresponding to the density of the original image of the second image (B). 160 μm, 2-2 image line (5-2) image line width (W32) 140 μm, 2-3 image line (5-3) image line width (W33) 120 μm, 2-4 image line The line (5-4) was linear with an image line width (W34) of 100 μm, an image line height (h3) of 20 μm, and a third pitch (D3) of 460 μm. The color material forming the second image line (5) is black (Liojet FV03Black manufactured by Toyo Ink Manufacturing Co., Ltd.), and the first image line (4) and the second 4-4 at the second observation angle (E2). The lightness difference from the image line (5-4) portion was 35 (variable spectrophotometer (GSP-2 type: manufactured by Murakami Color Research Laboratory Co., Ltd.)).

  When the formed body (S) produced in Example 2 was observed at the first observation angle (E1), the number “123” as the first image (A) and the flower design were visible in black. Next, when the formed body (S) was observed at the second observation angle (E2), the gray image of the second image (B) was observed in black.

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

DESCRIPTION OF SYMBOLS 1 Base material 2 Background part 3 Pattern part 4, 4a, 4b 1st image line 5,5-1, 5-2, 5-3, ..., 5- (n-1), 5-n 2nd Image A A 1st image B 2nd image S Anti-counterfeit Z Z Print area W Image line width h Image line height D Pitch L Light source

Claims (3)

Comprising at least a part of the printed area on the substrate;
The print area includes a first image line composed of a 1a image line having a color different from that of the base material and a 1b image line arranged at a position not overlapping the 1a image line in a first direction. And at least a second image line having a bulge regularly arranged in the first direction in a color different from that of the base material on the first image formed in a plurality of regularly arranged on the first image. A second image consisting of
The first image is divided into a background part and a pattern part by different line area ratios per unit area,
The first image line has light and dark flip-flop properties due to the smooth surface of the image line,
The second image line has the same or higher light transmittance and lightness under diffuse reflection light as the first image line, and the lightness under regular reflection light is lower than that of the first image line. It is arranged in a stack on the image line of the 1a below the image line width of the image line,
An anti-counterfeit forming body characterized in that the first image and the second image are changed and viewed by changing an observation angle. The second image has gradation by changing the image line height of the second image line in accordance with the density of the original image of the second image. The forgery prevention formed body according to claim 1. 3. The forgery according to claim 2, wherein the second image forms a part of the gradation by at least a part of the first-a image line in which the second image line is not stacked. 4. Prevention formation.

Images