JP5597874B2 - Latent image printed matter - Google Patents

Description

  The present invention relates to a latent image printed material, and is particularly suitable for security printed materials such as banknotes, passports, securities, identification cards, cards, and passports that require an anti-counterfeit effect, and the image changes the viewing angle. The present invention relates to a latent image printed material that changes in response.

  Recent advances in digital equipment such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of valuable prints. As one of the anti-counterfeiting techniques for preventing duplication and forgery, there have been many ones to which an optical security element represented by a hologram whose image changes depending on the observation angle is attached.

  However, unlike conventional anti-counterfeiting technology, which is formed by printing with ink, holograms are formed using complex manufacturing processes and special materials, making them more difficult to manufacture compared to conventional anti-counterfeit prints. It is time consuming and extremely expensive. From this, special light reflective powders such as metal ink, interference mica, oxidized flake mica, pigment coated aluminum flakes and optically changing flakes are blended into the ink or paint, By using a complicated halftone dot configuration, forgery prevention printed matter that can be formed by a general printing method that realizes an image change similar to a hologram has appeared.

  Although the applicant uses general and relatively inexpensive materials and simple printing means, the information recognized by the human eye at a specific part in the printed material is observed at a specific observation angle. An application for an anti-counterfeit information carrier that changes to completely different information by changing the angle has been filed (see, for example, Patent Document 1).

JP 2008-188973 A

  However, in the printed matter described in Patent Document 1, images that can be observed under visible light are limited to two images: an image that can be viewed under diffuse reflected light and an image that can be viewed under regular reflected light. In order to improve authenticity discrimination, an effect of changing many images like a hologram under visible light has been demanded.

  In view of the above circumstances, the present invention is a printed material having an effect of changing an image according to an observation condition using an ink containing a glittering material and a transparent ink, and an image observed under diffuse reflected light, To provide a latent image print in which an image observed under weak specular light with a small light reflection angle and an image observed under stronger specular light with a large light reflection angle are different images. With the goal.

  The latent image printed material according to the present invention includes a printed image on at least a part of a glossy base material, and the printed image includes a glittering material and is formed on the first image formed with ink of a color different from that of the base material. A second image formed of transparent ink is formed, the first image has a first background portion and a first information portion, and the first background portion is A plurality of background image lines are arranged in a predetermined direction at a predetermined pitch, and the first information section is formed by arranging a plurality of first information image lines in a predetermined direction at a predetermined pitch. The first information image line is disposed adjacent to or close to the second image line, the second image has a second background part and a second information part, and the second background part is a positive image line. A plurality of positive image lines arranged in a predetermined direction at a predetermined pitch, and a negative image formed by arranging a plurality of negative image lines in a predetermined direction at a predetermined pitch. It is composed of line groups, and the positive and negative lines have different phases in the predetermined direction, and the positive line group and the negative line group are formed with the same line area ratio. The section is formed by arranging a plurality of second information lines in a predetermined direction at a predetermined pitch, and the second information lines are arranged adjacent to or close to the positive line and / or the negative line, Either the positive image line or the negative image line is formed on the first background image line, and the first image is visible in the observation angle region where the diffuse reflected light is dominant, The positive image line group or the negative image line group can be visually recognized in the observation angle region where the weak regular reflection light is dominant, and the second information portion is visible in the observation angle region where the strong regular reflection light is dominant. It is characterized by.

  The latent image printed material according to the present invention is characterized in that the image line widths of the positive image line and the negative image line are equal to or smaller than the image line width of the first background image line.

  The latent image printed material according to the present invention is characterized in that the predetermined pitch is formed within a range of 0.1 mm to 5 mm.

  The latent image printed material according to the present invention is characterized in that the image area ratio of the first image and the image area ratio of the second image are formed within a range of 20% to 100%.

  In the latent image printed material according to the present invention, the image area ratio of the first background portion is formed within a range of 20% to 70%, and the image area ratio of the first information portion is the first background area. It is formed within a range of 10% to 50% or less, and the area ratio of the second background portion is formed within a range of 20% to 70%, The image area ratio of the second information portion is formed to be equal to or less than the image area ratio of the second background portion and within a range of 10% to 30%.

  According to the latent image printed matter of the present invention, an image formed with an ink containing a glittering material and an image formed with a transparent ink are superposed according to a certain rule, whereby the number of printing colors is increased. Without increasing the number of images, it is possible to obtain a printed matter with a high anti-counterfeit effect, in which images that can be visually recognized are different under the three viewing conditions.

It is explanatory drawing which shows the latent image printed matter by embodiment of this invention. It is explanatory drawing which shows the structure of the printing image in a latent image printed matter. (A) is an observation state under diffuse reflection light, (b) is an observation state under weak regular reflection light, and (c) is an explanatory view showing an observation state under strong regular reflection light. (A) is explanatory drawing of a 1st background part, (b) is explanatory drawing of a 1st information part. (A) is explanatory drawing of a 2nd background part, (b) is explanatory drawing of a 2nd information part. It is explanatory drawing which shows the positional relationship of each image line which comprises a printing image. (A) shows an image visually recognized when the observer's viewpoint is under diffusely reflected light, (b) shows an image visually recognized when the observer's viewpoint is under weak specularly reflected light, c) It is explanatory drawing which shows the image visually recognized when an observer's viewpoint is under strong regular reflection light. It is explanatory drawing which shows the latent image printed matter by one Example of this invention. (A) is explanatory drawing of the 1st image contained in latent image printed matter, (b) is explanatory drawing of the 2nd image contained in the latent image printed matter. (A) is explanatory drawing of a 1st background part, (b) is explanatory drawing of a 1st information part. (A) is explanatory drawing of a 2nd background part, (b) is explanatory drawing of a 2nd information part. It is explanatory drawing which shows the positional relationship of each image line which comprises a printing image. (A) shows an image visually recognized when the observer's viewpoint is under diffusely reflected light, (b) shows an image visually recognized when the observer's viewpoint is under weak specularly reflected light, c) It is explanatory drawing which shows the image visually recognized when an observer's viewpoint is under strong regular reflection light. It is explanatory drawing which shows the latent image printed matter by one Example of this invention. (A) is explanatory drawing of the 1st image contained in latent image printed matter, (b) is explanatory drawing of the 2nd image contained in the latent image printed matter. (A) is explanatory drawing of a 1st background part, (b) is explanatory drawing of a 1st information part. (A) is explanatory drawing of a 2nd background part, (b) is explanatory drawing of a 2nd information part. It is explanatory drawing which shows the positional relationship of each image line which comprises a printing image. (A) shows an image visually recognized when the observer's viewpoint is under diffusely reflected light, (b) shows an image visually recognized when the observer's viewpoint is under weak specularly reflected light, c) It is explanatory drawing which shows the image visually recognized when an observer's viewpoint is under strong regular reflection light.

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

  Here, the image line is an image element formed by continuously arranging printing halftone dots, which are the minimum units constituting an image in a printed matter, without any gaps in a predetermined direction, for example, straight lines, curved lines, wavy lines, A broken line such as a dotted line or a broken line is included, and any shape of the image line is included in the image line in the present invention.

  FIG. 1 shows a latent image printed material (1) according to this embodiment. The latent image print (1) has a print image (3) at least partially on the substrate (2), and FIG. 2 shows a configuration diagram of the print image (3).

  As shown in FIG. 2, the print image (3) is formed by overlapping the second image (5) on the first image (4). Here, the first image (4) is an image that is visible in an observation angle region where diffuse reflected light is dominant, and is formed of ink containing a glittering material. The second image (5) includes an image that is visible in an observation angle region in which weak specular light having a small reflection angle is dominant and an observation angle region in which strong specular light having a large reflection angle is dominant. Made of transparent ink. Detailed description of these inks will be described later.

  The first image (4) includes a first background portion (6) and a first information portion (7). The second image (5) includes a second background portion (10) and a second information portion (11), and the second background portion (10) further includes a positive image line group (14a) and a negative image. It is divided into line groups (14b).

  In addition, a base material (2) needs to be a base material which has fixed gloss. Therefore, coated paper, plastic board, metal, and the like are desirable, but high-quality paper can also be used as a substrate as long as it has a certain level of smoothness (a certain correlation with glossiness can be expected). For example, if the Beck smoothness exceeds 500 s, it is possible to obtain a certain effect even with high-quality paper. However, in the case of high-quality paper having a lower smoothness than this, the reflected light generated from the base material becomes insufficient, and it becomes difficult to observe an image appearing under strong regular reflected light having a large light reflection angle.

  Further, the latent image printed material (1) is not limited with respect to the outer shape, dimensions, and the like. The image formed on the printed image (3) is not limited in color as long as it includes an image that has a color different from that of the base material and can be viewed under diffuse reflected light.

  Referring to FIG. 3, “observation angle region in which diffuse reflection light is dominant”, “observation angle region in which weak regular reflection light with a small light reflection angle is dominant” and “light reflection angle” in the present invention. The observation angle region where the large specularly reflected light is dominant will be described.

  In the present invention, the “observation angle region in which diffusely reflected light is dominant” means that the latent image printed material (1), the light source (15), and the observer's viewpoint (16a) are in a positional relationship as shown in FIG. There is a region where the incident angle of light incident on the latent image printed matter (1) from the light source (15) and the reflection angle of the light reflected from the latent image printed matter (1) are largely different, and there is almost no specularly reflected light. It is. Hereinafter, the state in which the latent image print (1) is observed in the “observation angle region where the diffuse reflection light is dominant” is referred to as under diffuse reflection light.

  In the present invention, the “observation angle region in which weak regular reflection light having a small light reflection angle is dominant” means that the latent image print (1), the light source (15), and the observer's viewpoint (16b) are as shown in FIG. The angle of light incident on the latent image printed matter (1) from the light source (15) is substantially equal to the angle of the light reflected from the latent image printed matter (1). Among the viewing angle regions, the reflection angle (may be an incident angle) is a relatively small value, for example, an observation angle region where the reflection angle is in the vicinity of 0 to 70 °. Hereinafter, the specular reflection light generated in the “observation angle region where the weak specular reflection light with a small light reflection angle is dominant” is referred to as a weak specular reflection light, and the latent image print (1) is referred to as “a weak positive reflection with a small light reflection angle. The state of observation in the “observation angle region where the reflected light is dominant” is referred to as under weak regular reflection light.

  In the present invention, the “observation angle region in which strong regular reflection light having a large light reflection angle is dominant” means that the latent image print (1), the light source (15), and the observer's viewpoint (16c) are as shown in FIG. The angle of light incident on the latent image printed matter (1) from the light source (15) is substantially equal to the angle of the light reflected from the latent image printed matter (1). Among the viewing angle regions, the reflection angle (which may be an incident angle) is a relatively large value, for example, an observation angle region where the reflection angle is in the vicinity of 70 ° to 90 °. Hereinafter, the specular reflection light generated in the “observation angle region where the strong specular reflection light having a large light reflection angle is dominant” is referred to as a strong specular reflection light, and the latent image print (1) The state of observation in the “observation angle region where reflected light is dominant” is called under strong regular reflection light.

  “Under the weak regular reflection light” and “Under the strong regular reflection light” are both observation angle regions in which the diffuse reflection light hardly exists and the regular reflection light is a large proportion, but the positive reflection caused by the magnitude of the reflection angle. Differences occur in the nature of the reflected light.

  Specifically, the specularly reflected light tends to become stronger as the reflection angle increases. However, the intensity of light is not only increased, but, for example, strong specular light that is incident on the printed material at an angle close to 90 ° of the printed image and reflected at an angle close to 90 ° is a small angle near 45 °. Compared with the weak specularly reflected light reflected at, the state of the reflecting surface is remarkably reflected.

  Specifically, when a light reflection surface is observed in strong regular reflection light generated at a large reflection angle, foreign matters existing on the reflection surface and unevenness of the reflection surface itself can be more easily observed. This is considered to be a phenomenon that occurs because the proportion of the surface reflected light that is reflected by the reflecting surface without entering light inside the reflecting surface is relatively increased. In the present invention, a phenomenon is used in which foreign matter on the surface of the reflecting surface (in the present invention, inks having greatly different reflectances printed on the reflecting surface) can be easily observed under the strong specularly reflected light.

  FIG. 4 shows a specific image line configuration of the first image (4) and a specific image line configuration of two images included in the first image (4). As shown in FIG. 4, the first image (4) is composed of a first background part (6) shown in FIG. 4 (a) and a first information part (7) shown in FIG. 4 (b). ing.

  The first background portion (6) is formed by regularly arranging a plurality of first background image lines (8) having an image line width (W1) in a predetermined direction at a pitch (P1). (7) is formed by regularly arranging a plurality of first information image lines (9) having an image line width (W2) at the same pitch (P1) in a predetermined direction. The first information part (7) is first significant information that appears in an environment under diffuse reflected light.

  The predetermined direction in the present invention refers to a direction orthogonal to the image line, that is, the S1 direction in the drawing.

  The first background portion (6) and the first information portion (7) are formed of the same glittering ink. Here, the area of the first information part (7) overlaps the area of the first background part (6) having a certain gradation, so that the image line is drawn in the first background part (6). There is a difference in area ratio, and under diffuse reflected light, the letters “Japan”, which is the first significant information composed of the first information portion (7), are visually recognized by shading.

  The above-described region forming the first background portion (6) and the region forming the first information portion (7) mean that the regions overlap each other, and each component is configured. It does not mean that the drawn lines overlap.

  The first background image line (8) and the first information image line (9) need to be formed at positions that do not overlap, and may be in close proximity or adjacent as long as they do not overlap. . When the first background image (8) and the first information image (9) are formed to overlap, the density of the first information portion (7) in the overlapped area is impaired, and the design It is not suitable because the intended concentration cannot be obtained at the stage.

  Here, the line area ratio of the first image (4) and the line area of the first background part (6) and the first information part (7) forming the first image (4). The rate will be described. The image area ratio in the present invention is the ratio of the area of the image line in a certain area.

  The image area ratio in the first image (4) is desirably formed in the range of 20 to 100%. This is because, when the first image (4) is formed with an image area ratio of 20% or less, a sufficient amount of light cannot be reflected when light is reflected, and the light is under weak regular reflection light and strong regular reflection light. This is because the visibility of the two images appearing below is greatly reduced.

  It is desirable that the first background portion (6) has a constant gradation, that is, a constant line area ratio, and the line area ratio is in the range of 20 to 70%. On the first background image line (8) of the first background portion (6), either a positive image line (12a) or a negative image line (12b), which will be described later, is formed so as to overlap. Only the image line formed on the background image line (8) is an image that appears under weak specular reflection light.

  Therefore, when the width of the first background image line (8) is not sufficient, that is, when the image area ratio of the first background portion (6) is small, the visual appearance of the image appearing under weak specular light is recognized. It becomes low. For this reason, it is not desirable to form the first background portion (6) with a line area ratio of 20% or less. In addition to the first background portion (6), the first information portion (7) is indispensable for the first image (4). Considering the ratio of these image lines and regions, The first background portion (6) desirably has an image area ratio of 70% or less.

  The first information section (7) is not limited to binary images such as characters and marks, but may have gradation such as a human face or landscape, so-called multi-gradation. Moreover, it is desirable that the line area ratio of the first information part (7) is equal to or less than the line area ratio of the first background part (6) and is in the range of 10 to 50%.

  This is because when an image is formed with an area ratio of 10% or less, a sufficient reflection density cannot be obtained under diffuse reflected light, and only an image with low visibility can be formed. Also, when the image area ratio exceeds 50%, the first information part (7) is difficult to disappear under weak specular reflection light. In this case, an image appearing under weak specular reflection light This is because the visibility is greatly impaired. In addition, it is not appropriate to form the first background portion (6) exceeding the image area ratio because the first information portion (7) is difficult to disappear under weak regular reflection light.

  Next, FIG. 5 shows a specific image line configuration of the second image (5) and a specific image line configuration of two images included in the second image (5). As shown in FIG. 5, the second image (5) is composed of a second background part (10) shown in FIG. 5 (a) and a second information part (11) shown in FIG. 5 (b). ing.

  The second background portion (10) is formed by arranging a plurality of positive image lines (12a) having an image line width (W3) regularly arranged in a predetermined direction at a pitch (P1). A group of positive image lines representing characters in a positive state and a negative image line (12b) having an image line width (W3) are arranged in the same direction at the same pitch (P1). And a negative line group in which the characters “OK” are expressed in a negative state.

  The positive image line and the negative image line are formed with a phase shift in a predetermined direction (S1 direction in the figure) so that they do not overlap each other. In FIG. 5A, the positive image line (12a) and the negative image line (12b) are arranged without a gap in a predetermined direction, but there is no problem even if a gap is provided. However, it is not preferable that the positive image line (12a) and the negative image line (12b) have an overlapping portion in the S1 direction, and there is an overlapping portion in a direction orthogonal to the S1 direction (left and right direction in the figure). must not.

  This is because the second background portion (10) is different from the positive image portion and the negative image portion because a part of the phase of one image line is different in the image lines arranged in a predetermined direction at the pitch (P1). As shown in FIG. 2, the positive image line group (14a) is formed by a plurality of positive image line parts, and the negative image line group (14b) is formed by a plurality of negative image line parts. It is. In other words, the image line forming the second background portion (10) is divided into a positive image line portion and a negative image line portion because a part of the phase of one image line is different. , There is no overlapping portion in the direction orthogonal to the S1 direction (left and right direction in the figure).

  The positive image line group and the negative image line group are the positive image line group (14a) and the negative image line group (14b) shown in FIG. The positive state refers to a state where the inside of “OK” is darkened, and the negative state refers to a portion other than “OK” in the second image (5) where the inside of “OK” is whitened. Refers to the state.

  The positive image line group (14a) in which a plurality of positive image lines (12a) are arranged and the negative image line group (14b) in which a plurality of negative image lines (12b) are arranged are the second appearing under weak specular reflection light. Represents significant information.

  The positive image line group (14a) and the negative image line group (14b) must have the same image area ratio and a range that does not exceed the image area ratio of the first background portion (6). If the positive image group (14a) and the negative image group (14b) are not in the same area ratio, the second significant image does not disappear under strong regular reflection light, and is viewed simultaneously with the third significant image. This is because an unclear image is observed. Further, it is possible to obtain an effect in which only the image line formed by superimposing the first background portion (6) on the positive image line (12a) and the negative image line (12b) appears under weak regular reflection light. Therefore, the positive image line (12a) and the negative image line (12b) formed by protruding the width of the first background portion (6) cannot function effectively. Therefore, the positive image line group (14a) and the negative image line group (14b) need to be in a range that does not exceed the image area ratio of the first background portion (6).

  The second information section (11) is formed by regularly arranging a plurality of second information image lines (13) having an image line width (W4) at the same pitch (P1) in the same predetermined direction.

  The second background portion (10) and the second information portion (11) are formed of the same transparent ink. Here, the area of the second information part (11) overlaps the area of the second background part (10), thereby causing a difference in the line area ratio in the second background part (10). Under strong specularly reflected light, the image of “cherry blossom petals”, which is the third significant information composed of the second information portion (11), is visually recognized by the shading.

  In addition, the area | region which forms the 2nd background part (10) and the area | region which forms the 2nd information part (11) mean the area | regions to the last, Comprising: It does not mean that the drawn lines overlap.

  Here, the predetermined direction means a direction orthogonal to the image line, that is, the S1 direction in the drawing. This is the same direction as the direction in which the first background image line (8) and the first information image line (9) described in FIG.

  The second information line (13) needs to be formed at a position that does not overlap with the positive line (12a) and the negative line (12b). You may be in a state. In the case where the second information image line (13), the positive image line (12a), and the negative image line (12b) are formed to overlap, the density of the second information portion (11) in the overlapped area is It is not suitable because it is damaged and the intended concentration cannot be obtained at the design stage.

  Here, the stroke area ratio of the second image (5) and the stroke area of the second background portion (10) and the second information portion (11) forming the second image (5). The rate will be described.

  It is desirable that the image area ratio (ratio of the image area occupied in a certain area) in the second image (5) is in the range of 20 to 100%. This is because when the second image (5) is formed with an image area ratio of 20% or less, a sufficient amount of light cannot be reflected when light is reflected. This is because the visibility of the two images appearing below is greatly reduced.

  The second background portion (10) is preferably within the range of the image area ratio of 20 to 70%. One of the positive image line (12a) and the negative image line (12b) appears as the second significant image under weak specular reflection light. In order to visualize the second significant image, 20 % Is the lower limit of the area ratio. Further, when an area ratio of 70% or more is allocated to the second background portion (10), either the positive image line (12a) or the negative image line (12b) is included in the first information portion (7). The area formed on top of it will be too large. If the overlapped area is too large, the first significant image appears to overlap the second significant image that appears under weak specularly reflected light, which is not preferable.

  The line area ratio of the second information portion (11) is preferably equal to or less than the line area ratio of the second background portion (10) and is not less than 10% and not more than 30%. This is because, when formed at 10% or less, the area ratio is too small and it is difficult to visually recognize the third significant information under strong specular reflection light. Conversely, when formed at 30% or more, even under weak specular reflection light. This is because the third significant information is easily visually recognized. Moreover, when it forms exceeding the image area ratio of a 2nd background part (10), since a 3rd significant image will be visually recognized similarly under weak regular reflection light, it is unpreferable.

  In the partially enlarged view in FIG. 4, the first background image line (8) is shown as a horizontal stripe image line, the first information image line (9) is shown as a vertical stripe image line, and FIG. In the partially enlarged view, the positive image line (12a) and the negative image line (12b) are indicated by hatched lines, and the second information image line (13) is indicated by a checkered pattern. In addition, similar enlarged lines are shown in partially enlarged views in each drawing described later. However, these displays are performed to make it easy to distinguish the configuration of each image line, and each actual image line is not formed by vertical stripes, diagonal stripes, or the like.

  Next, the ink containing the glittering material that forms the first image (4) and the transparent ink that forms the second image (5) will be described.

  The light reflection characteristics of the glittering material are as follows. When the ink containing the glittering material is printed on a general coated paper at a line area ratio of 100%, the lightness L * (CIEL *) under regular reflection light with a reflection angle of 45 °. a * b * color system) is 100 or more, and the difference between the brightness under diffuse reflected light (minimum brightness) and the brightness under regular reflection light with a reflection angle of 45 ° (maximum brightness) is 50 or more. It is desirable. When ink having only a reflection characteristic lower than this is used, the disappearance effect of the first image (4) under specular reflection light is reduced, and the image change effect that is the effect of the present invention may be lost. This is because it occurs.

  Further, the first image (4) may be colored by adding a coloring pigment, a coloring dye or the like. The color of the color pigment may be any hue such as red, blue or black. For example, the ink that forms the first background image line (8) and the first information image line (9) may be mixed with a coloring material together with a glittering material, or inks may be mixed in advance. The same image as the first image (4) by the first background image line (8) and the first information image line (9) is formed with the colored ink, and then the same first image with the ink containing the glittering material The image (4) may be formed by being overlapped.

  However, when an excessive amount of pigment is mixed, the gradation difference (darkness difference) in the first image (4) becomes too large, or the mixing ratio of the glittering material in the ink decreases. As a result, a phenomenon in which the first image (4) does not disappear sufficiently in observation under specular reflection light may occur.

  Therefore, when mixing pigments or mixing inks, even when mixing colored pigments of any color, the amount does not exceed a half of the blending ratio of the glittering material in the ink. It is desirable to keep it. When a color is imparted by previously forming the same image as the first image (4) with colored ink on the ground, a sufficient switching effect can be obtained regardless of the color and density of the ink used. Can do.

  Note that a general metal powder pigment such as aluminum powder, copper powder, zinc powder, tin powder, brass powder, iron phosphide powder, titanium oxide powder, or scaly mica powder may be used as the glittering material. Since these pigments have the property of strongly reflecting light, they are most preferable as the glittering material for forming the latent image printed matter of the present invention.

  When a general pearl pigment such as an iris pearl pigment and scale pigment, or a functional pigment such as a glass flake pigment or a cholesteric liquid crystal pigment is used, a light / dark flip that changes only the brightness of the first image (4) Color flip-flop property (characteristic that changes not only lightness but also hue) that changes not only the color property (mainly the property that changes only the lightness) but also the hue of the first image (4) can be imparted. .

  A functional material such as an IR absorbing pigment, a photochromic pigment, a temperature indicating material, and a thermochromic material may be added to the glittering material. However, when a functional material such as an IR absorbing pigment, a photochromic pigment, a temperature indicating material, or a thermochromic material is added, it needs to be added within a range that does not affect the effect of the latent image printed material in the present invention.

  The ink for forming the second image (5) needs to be transparent, and is preferably a matte system having lower gloss than the ink for forming the first image (4). When mat-type ink is used, the ratio of blocking the amount of light reaching the first image (4) is increased, and the visibility of the second image (5) is increased.

  The light reflection characteristics of the mat-based ink are as follows. When the ink is printed on a general coated paper at a line area ratio of 100%, the lightness value under specular reflection at a reflection angle of 45 ° is greater than the lightness value of the glitter ink. It is desirable that the difference between the brightness under diffuse reflection light (minimum brightness) and the brightness under regular reflection light (maximum brightness) be 30 or less. The image that appears under specular reflection light is visualized by the difference in reflectance between the glitter ink and the matte ink. Therefore, when the difference in brightness between the glitter ink and the mat ink is less than 20, it is difficult to easily visually recognize the image.

  Moreover, you may add functional materials, such as luminescent pigments, such as a fluorescent pigment, a phosphorescent pigment, and a phosphorescent pigment, IR absorption pigment, a photochromic pigment, a temperature indicating material, a thermochromic material, to this transparent ink. However, when adding these functional materials, it is necessary to select pigments that do not lose transparency, and it is necessary to add them within a range that does not affect the effect of the latent image printed matter in the present invention.

  FIG. 6 shows a first background image line (8), a first information image line (9), and a positive image line (when the first image and the second image in the print image (3) are superimposed. 12a), an appropriate positional relationship between the negative image line (12b) and the second information line (13).

  A plurality of first background lines (8) and first information lines (9) included in the first image (4) are arranged in a predetermined direction (S1 direction in the figure) at the same pitch (P1). .

  Further, the negative image line (12b) included in the second image (5) is formed so as to overlap the first background image line (8), and the positive image line included in the second image (5). (12a) and the second information image line (13) are directly formed on the base material (2) on which neither image line is formed.

  In this embodiment, an example in which a negative image line (12b) is formed on the first background image line (8) and a positive image line (12a) is formed on the substrate (2) will be described. However, as a configuration in which the positions of the positive image line (12a) and the negative image line (12b) of the second image (5) are reversed, the positive image line (12a) is placed on the first background image line (8). ) And the negative image line (12b) is formed on the substrate, that is, a configuration opposite to the configuration described in the present embodiment.

  For example, when the positive image line (12a) is formed on the first background image line (8), the second significant information appearing under the weak regular reflection light can be visually recognized in the positive state. When the negative image line (12b) is formed on the first background image line (8), the second significant information appearing under weak regular reflection light is visually recognized in the negative state.

  What is important in the present invention is that either the positive image line (12a) or the negative image line (12b) is superimposed on the first background image line (8). As a printing order, after printing the first image (4), the second image (5) is printed.

  In order to form the positive image line (12a) or the negative image line (12b) on the first background image line (8), the image line widths of the positive image line (12a) and the negative image line (12b) ( It is necessary to design the image line width (W3) ≦ the image line width (W1) so that W3) falls within the width within the image line width (W1) of the first background image line (8).

  Further, the image area ratio of the positive image line group (14a) and the negative image line group (14b) needs to be the same, and the image line widths of the two image lines are the same. If the image area ratios of the positive image line (12a) and the negative image line (12b) are different, the second significant image is not completely lost under strong specular reflection light, resulting in strong specular reflection light. The image appearing below is an unclear image in which the second significant image and the third significant image are mixed, and is not suitable because the image change effect of the present invention is low.

  The larger the line area ratio of the positive line group (14a) or the negative line group (14b), the more visible the positive line group (14a) or the negative line group (14b) that appears under specular reflection light. Since the height is high, the line width (W3) of the positive line (12a) or the negative line (12b) is designed to be approximately the same as the line width (W1) of the first background line (8). It is desirable to do.

  However, as the image line width (W3) of the positive image line (12a) or the negative image line (12b) approaches the image line width (W1) of the first background image line (8), it is possible to prevent misalignment at the time of manufacturing. The tolerance is reduced. Therefore, it is desirable to design each line width in consideration of the printing accuracy in a machine that performs printing.

  Further, a predetermined pitch (P1) in the first background image line (8), the first information image line (9), the positive image line (12a), the negative image line (12b), and the second information image line (13). ) Is preferably in the range of 0.1 mm to 5 mm in consideration of print reproducibility and image resolution.

  Next, the effect of the present invention will be described. 7A to 7C, when the positional relationship between the light source (15), the latent image printed matter (1), and the observer's viewpoints (16a, 16b, 16c) is changed, the latent image printed matter (1) is changed. An observable image is shown in the printed image (3).

  As shown in FIG. 7 (a), when the latent image print (1) is observed under diffuse reflected light, the observer (16a) is in a flat gradation of the first background portion (6). In addition, the letters “Japan”, which is the first significant information constituted by the first information part (7), are visually recognized.

  As shown in FIG. 7 (b), when the latent image print (1) is observed under weak specular reflection light, the observer (16b) has a second significant line constituted by the negative image line group (14b). The information “OK” is visually recognized in a negative state.

  As shown in FIG. 7C, when the latent image printed matter (1) is observed under strong regular reflection light, the observer (16c) has a third information section (11) configured by the second information section (11). The image of “Sakura Petal” which is significant information is visually recognized.

  Thus, three different images are visually recognized according to the observation state. Not only has the effect of changing the first significant information and the second significant information under diffusely reflected light and weakly specularly reflected light, respectively, but also the effect that the third significant information can be visually recognized under strong specularly reflected light. Therefore, it is possible to obtain a higher anti-counterfeit effect as compared with the conventional anti-counterfeit technology.

  Below, the principle which produces the effect mentioned above is demonstrated. When the first image (4) and the second image (5) are formed at the overlapping position as shown in FIG. 6, the second image (5) is formed of transparent ink, so that the diffuse reflected light is formed. It is invisible below, and only the first image (4) is visible to the observer (16a).

  Subsequently, under weak specular reflection light, the light source (15) is incident on the printed image (3), and the first image (4) containing the glittering material strongly reflects the light to increase the brightness, and visually. It becomes difficult to catch on. However, in the region formed by overlapping the second image (5), the incident light is blocked by the transparent ink and the light cannot be reflected, so the brightness does not increase and the image remains dark. It does not change.

  As described above, light and darkness occurs depending on whether or not the second image (5) is formed on the first image (4) under weak regular reflection light. In particular, since the dark area in which the incidence of light is blocked reflects the shade of color under diffuse reflection light, the first image (4) is more effective than the area where the transparent ink is directly formed on the substrate. The area formed above the image line appears darker. Therefore, the negative image line (12b) regularly superposed on the first background image line (8) is relatively dark compared to the other areas that change brightly under weak specular light. It becomes a color, and the second significant information constituted by the negative image line (12b) is visually recognized by the observer (16b) by the contrast of light brightness.

  Finally, under strong specular light, the first image (4) is not only visually observable, as is the case with weak specular light, but the light reflected from the surface of the substrate (2) increases, The difference in the ink of the image formed on the substrate and the uneven structure are further emphasized. Specifically, the base material (2) and the first image (4) appear to brightly reflect light strongly, but the second image (5) formed with matte ink is relatively reflective of light. Appears dark because of weakness. That is, the brightness of light is generated depending on the presence or absence of the second image (5). Therefore, the third significant information formed by the size of the area ratio of the second image (5) (the presence or absence of the second information portion (11)) is displayed to the observer (16c) under strong regular reflection light. It is visually recognized by the contrast of light.

  The effect that the third significant information can be observed under strong regular reflection light is not actually a phenomenon that occurs only at a large reflection angle. Even under specularly reflected light that is reflected at a small angle in the vicinity of a reflection angle of 45 °, the third significant information may be visually recognized if the incident angle and the reflection angle of the light are combined without any deviation.

  However, since the amount of reflected light is small at such a small reflection angle and it is visible only in a very narrow angle range, it is difficult to capture the image that has appeared. Conversely, the third significant information that appears under specular reflection light that occurs at a large reflection angle of 70 ° to 90 ° can be visually recognized relatively easily. Therefore, in the present invention, strong specularly reflected light generated at a large reflection angle is used with an emphasis on convenience that observation is easier.

  Here, in the first image (4), a positive image line (12a) or a negative image formed with transparent ink on the first information image line (9) forming the first information portion (7). When the line (12b) or the second information image line (13) is formed so as to overlap, the area where the transparent ink overlaps is reflected by the first information part (7) receiving light under weak regular reflection light. And the image does not disappear visually, so the first significant information and the second significant information of the positive are reflected in the second significant information of the negative appearing under weak specular light. May result in a nasty image.

  In order not to make the image appearing under the weak regular reflection light unclear as described above, the positive image line (12a) and the negative image line (12b) are placed on the first information image line (9). It is desirable to have an image line configuration in which neither the image line of the second information image line (13) nor the image line of the second information image line (13) is formed.

  However, as in the example described in Example 2, which will be described later, when it is desired to increase the area ratio of the first information portion (7) in order to prioritize the visibility of the first significant information, the misalignment may occur during manufacturing. Even if any of the positive image line (12a), the negative image line (12b), or the second information image line (13) is slightly overlapped on the first information image line (9). Since the area where the negative line (12b) overlaps the first background line (8) is relatively large, the influence on the visibility of the second significant information appearing under weak specular light is Relatively small. Accordingly, a case where the positive image line (12a) or the negative image line (12b) slightly overlaps the first information image line (9) is also included in the technical scope of the present invention.

  The printing method of the latent image printed material in the present invention can be formed by any printing method such as offset printing, flexographic printing, letterpress printing, gravure printing, screen printing, and intaglio printing. If metal ink can be used, it can also be formed by various digital output machines such as IJP, laser printer, sublimation printer, etc. In this case, the information of one output item is changed. In other words, so-called variable printing can be performed.

  The embodiment is merely an example, and various modifications can be made within the technical scope of the present invention.

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

  Example 1 will be described with reference to FIGS. FIG. 8 is a diagram showing the latent image printed matter (1-1) of the present invention, and the latent image printed matter (1-1) includes a printed image (3-1) on a substrate (2-1). It consists of

  As shown in FIG. 9, the print image (3-1) is displayed on the first image (4-1) shown in FIG. 9A on the second image (5- 1) is formed by overlapping. In addition, the general coated paper was used for the base material (2-1).

  First, the first image (4-1) will be described. As shown in FIG. 10, the first image (4-1) includes a first background part (6-1) shown in FIG. 10 (a) and a first information part (7) shown in FIG. 10 (b). -1).

  In the first background portion (6-1), the first background image line (8-1) having an image line width of 0.15 mm is 0.60 mm pitch in the S1 direction (direction orthogonal to the image line) in the figure. Are arranged, and the image area ratio is 25% and the gradation is constant.

  In the first information section (7-1), the first information image line (9-1) having an image line width of 0.15 mm is 0.60 mm pitch in the S1 direction (direction orthogonal to the image line) in the figure. The image area ratio is the same 25%, and the first significant information “Japan” is formed.

  The first background image line (8-1) and the first information image line (9-1) are arranged at equal intervals with a gap of 0.15 mm.

  Next, the second image (5-1) will be described. As shown in FIG. 11, the second image (5-1) includes a second background portion (10-1) shown in FIG. 11 (a) and a second information portion (shown in FIG. 11 (b)). 11-1) including two image portions. The second background portion (10-1) includes, as in the embodiment, a positive image line group expressing the characters “OK” in a positive state and a negative image line group expressing the characters “OK” in a negative state. It is divided into

  The positive image line group is formed by arranging a plurality of positive image lines (12a-1) having an image line width of 0.15 mm at a pitch of 0.60 mm in the S1 direction (direction orthogonal to the image line) in the drawing. The line group is formed by arranging a plurality of negative image lines (12b-1) having an image line width of 0.15 mm at a 0.60 mm pitch in the S1 direction (direction orthogonal to the image lines) in the drawing. The positive image line (12a-1) and the negative image line (12b-1) were formed by shifting the phase in the S1 direction by 0.15 mm so as not to overlap with each other in the horizontal direction and the vertical direction.

  Further, the second information section (11-1) has a second information image line (13-1) having an image line width of 0.12 mm in the S1 direction (direction orthogonal to the image line) in the figure. A plurality of images are arranged at a pitch of 60 mm, and an image of “cherry blossom petals” which is third significant information is formed. The second information line (13-1) was placed adjacent to the negative line (12b-1).

  In FIG. 12, the first image (4-1) when the first image (4-1) and the second image (5-1) in the print image (3-1) are superimposed is formed. The first background image line (8-1) and the first information image line (9-1), the positive image line (12a-1) forming the second image (5-1), and The overlapping positional relationship with the negative image line (12b-1) and the second information image line (13-1) is shown.

  First, the first image (4-1) is formed by a wet offset printing method using silver ink (T & K Silver TKSO) containing an aluminum pigment as a glittering material, and then the second image (5- 1) was overlaid on the first image (4-1) by the same wet offset printing method using OP varnish (matt medium manufactured by T & K TOKA) to form a latent image print (1-1).

  Specifically, neither the first background image line (8-1) or the first information image line (9-1) forming the first image (4-1) exists. On the substrate, the positive image line (12a-1) of the second image (5-1) and the second information image line (13-1) are printed, and the first image (4-1) Positional relationship where the negative image line (12b-1) of the second image (5-1) overlaps the first background image line (8-1) forming the first background part (6-1). And formed by printing together. Note that no image line is superimposed on the first information image line (9-1).

  FIG. 13 shows the effect of the latent image printed material (1-1). As shown in FIG. 13 (a), when the latent image printed matter (1-1) is observed under diffuse reflected light, the observer (16a-1) gives the character “Japan” as the first significant information. Was visible. Further, as shown in FIG. 13B, when the latent image printed matter (1-1) is observed under weak specularly reflected light, the observer (16b-1) has “OK” which is the second significant information. "Was visible. Furthermore, as shown in FIG. 13 (c), when the latent image printed matter (1-1) is observed under strong specular reflection light, the observer (16c-1) has the third significant information “Sakura no The image of “petals” was visible. Thus, three different images were visually recognized depending on the observation state.

  A second embodiment will be described with reference to FIGS. In the second embodiment, an example in which the first significant information is not a binary image such as a character or a symbol but a multi-gradation image having a rich gradation will be described.

  FIG. 14 is a diagram showing a latent image printed matter (1-2) according to the present invention. The latent image printed matter (1-2) includes a printed image (3-2) on a substrate (2-2). It consists of

  As shown in FIG. 14, the print image (3-2) is formed on the first image (4-2) shown in FIG. 15 (a) and the second image (5- 2) is formed by overlapping. In addition, the general coated paper was used for the base material (2-2).

  First, the first image (4-2) will be described. As shown in FIG. 16, the first image (4-2) includes a first background part (6-2) shown in FIG. 16 (a) and a first information part (6-2) shown in FIG. 7-2).

  In the first background portion (6-2), the first background image line (8-2) having an image line width of 0.15 mm has a pitch of 0.50 mm in the S1 direction (direction orthogonal to the image line) in the drawing. A plurality of colors are arranged, and the gradation is constant at an image area ratio of 30%.

  In the first information section (7-2), the first information image line (9-2) having an image line width of 0.15 mm has a pitch of 0.50 mm in the S1 direction (direction orthogonal to the image line) in the figure. The image area ratio is 30%, and an image of “female face” which is the first significant information is formed. However, each first information line (9-2) is not formed with a certain gradation (light and shade), but represents an image of a “female face” in the line. It is formed of light and shade with a dot area ratio of 0 to 100%. The halftone dot area ratio here means the ratio of the area of halftone dots in a certain area in one first information image line (9-2), and the first information image line (9-2). -2) Each one is formed with multiple gradations.

  Further, the first background image line (8-2) and the first information image line (9-2) were arranged with a half pitch (0.25 mm) shift.

  Next, the second image (5-2) will be described. As shown in FIG. 17, the second image (5-2) includes a second background portion (10-2) shown in FIG. 17A and a second information portion (FIG. 17B). 11-2) including two image portions. The second background portion (10-2) includes a positive image line group expressing the character “A” in a positive state and a negative image line group expressing the character “A” in a negative state, as in the embodiment. It is divided into

  The positive image line group is composed of a plurality of positive image lines (12a-2) having an image line width of 0.15 mm arranged at a pitch of 0.50 mm in the S1 direction (direction orthogonal to the image line) in the drawing. The line group is formed by arranging a plurality of negative image lines (12b-2) having an image line width of 0.15 mm at a pitch of 0.50 mm in the S1 direction (direction orthogonal to the image line) in the drawing. The positive image line (12a-2) and the negative image line (12b-2) were formed by shifting the phase in the S1 direction by 0.15 mm so as not to overlap with each other in the horizontal direction and the vertical direction.

  In the second information section (11-2), two second information image lines (13-2) having an image line width of 0.05 mm are arranged in a 0.50 mm pitch, and these are taken as a set. A plurality of characters are arranged at a pitch of 0.50 mm with a shift of 0.25 mm, and the letter “B”, which is the third significant information, is formed. As shown in FIG. 17, the second information image line (13-2) was arranged adjacent to the upper and lower sides of the negative image line (12b-2).

  In FIG. 18, a first image (4-2) is formed when the first image (4-2) and the second image (5-2) in the print image (3-2) are superimposed. The first background image line (8-2) and the first information image line (9-2), the positive image line (12a-2) forming the second image (5-2), and The overlapping positional relationship with the negative image line (12b-2) and the second information image line (13-2) is shown.

  First, the first image (4-2) is formed by a wet offset printing method using silver ink (T & K silver TKSO) containing an aluminum pigment as a glittering material, and then the second image (5- The latent image printed matter (1-2) was formed by superimposing 2) on the first image (4-2) by the same wet offset printing method using OP varnish (matt medium manufactured by T & K TOKA).

  Specifically, neither the first background image line (8-2) or the first information image line (9-2) forming the first image (4-2) exists. On the base material, the second information image line (13-2) of the second image (5-2) is printed, and the first background portion (6-2) of the first image (4-2). The negative image line (12b-2) of the second image (5-2) is printed on the first background image line (8-2) that forms the image. In the positive image line (12a-2), a part of the image line overlaps the first information image line (9-2).

  FIG. 19 shows the effect of the latent image printed material (1-2). As shown in FIG. 19 (a), when the latent image printed matter (1-2) is observed under diffuse reflected light, the viewer (16a-2) gives the “significant female face” which is the first significant information. Images were visible. Further, as shown in FIG. 19B, when the latent image printed matter (1-2) is observed under weak regular reflection light, the observer (16b-2) has the second significant information “A”. "Was visible. Furthermore, as shown in FIG. 19C, when the latent image printed matter (1-2) is observed under strong regular reflection light, the viewer (16c-2) has the third significant information “B”. "Was visible. Thus, three different images were visually recognized depending on the observation state.

1, 1-1, 1-2 Latent image printed matter 2, 2-1, 2-2 Base material 3, 3-1, 3-2 Print image 4, 4-1, 4-2 First image 5, 5 -1, 5-2 Second image 6, 6-1 and 6-2 First background portion 7, 7-1 and 7-2 First information portion 8, 8-1 and 8-2 First Background image line 9, 9-1, 9-2 First information image line 10 10-1, 10-2 Second background part 11 11-1, 11-2 Second information part 12a, 12a-1, 12a-2 Positive image lines 12b, 12b-1, 12b-2 Negative image lines 13, 13-1, 13-2 Second information image line 14a Positive image line group 14b Negative image line group 15 Light sources 16a, 16b, 16c 16a-1, 16b-1, 16c-1, 16a-2, 16b-2, 16c-2

Claims (5)

A printed image is provided on at least a part of a glossy substrate, and the printed image includes a glittering material and is formed on a first image formed of an ink of a different color from the substrate by a transparent ink. A second image is formed,
The first image has a first background portion and a first information portion,
The first background portion includes a plurality of first background lines arranged in a predetermined direction at a predetermined pitch, and the first information section includes a first information line in the predetermined direction at the predetermined pitch. The first background image line and the first information image line are arranged adjacent to each other or close to each other.
The second image has a second background portion and a second information portion,
The second background portion includes a group of positive image lines in which a plurality of positive image lines are arranged in the predetermined direction at the predetermined pitch, and a negative image in which a plurality of negative image lines are arranged in the predetermined direction at the predetermined pitch. The positive image line and the negative image line have different phases in the predetermined direction, and the positive image line group and the negative image line group are formed with the same image area ratio. The second information section is formed by arranging a plurality of second information image lines in the predetermined direction at the predetermined pitch, and the second information image line includes the positive image line and / or the negative image line. Is located adjacent to or close to
Either the positive image line or the negative image line is formed on the first background image line,
The first image is visible in an observation angle region where diffuse reflection light is dominant, and the positive image line group or the negative image line group is visible in an observation angle region where weak specular light is dominant. The latent image printed matter, wherein the second information part is visible in an observation angle region where strong specular reflection light is dominant. 2. The latent image printed matter according to claim 1, wherein the image line widths of the positive image line and the negative image line are equal to or smaller than the image line width of the first background image line. The latent image printed matter according to claim 1, wherein the predetermined pitch is formed within a range of 0.1 mm to 5 mm. 4. The latent image according to claim 1, wherein the image area ratio of the first image and the image area ratio of the second image are formed within a range of 20% to 100%. Printed matter. The line area ratio of the first background portion is formed within a range of 20% to 70%, and the line area ratio of the first information portion is the line area of the first background portion. Less than the ratio and formed within the range of 10% to 50%, and the image area ratio of the second background portion is formed within the range of 20% to 70%. 5. The latent image printed matter according to claim 4, wherein the image area ratio of the information portion is less than the image area ratio of the second background portion and is within a range of 10% to 30%. .

Images