JP6948029B2 - Transparent latent image printed matter - Google Patents

Description

According to the present invention, in valuable printed matter that requires an anti-counterfeiting effect, such as banknotes, passports, securities, identification cards, cards, and toll tickets, a part of the color of an image changes under reflected light and transmitted light. It relates to a transmitted latent image printed matter.

In recent years, advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate reproductions of precious printed matter. In order to prevent duplication and counterfeiting by this digital device, anti-counterfeiting technology that cannot be reproduced by a printer or a copier is required.

Today, as one of the anti-counterfeiting technologies, there is a so-called "watermark technology" in which a pattern is formed by the density and thickness of paper and visually recognized under transmitted light. This watermark technology can determine the authenticity in any environment as long as there is a certain amount of light or more. In addition, because it is extremely well known, it is still used in banknotes around the world, despite being a technology that has existed for a long time.

However, the watermark technology needs to be formed at the paper manufacturing stage, and it is not easy to manufacture unless it is a paper manufacturer. In addition, it is a technology that is generally difficult to adopt due to its high manufacturing cost. As a method for reproducing this in a pseudo manner, there is an anti-counterfeiting technique in which a special penetrating ink is used in the printing process and a transmission image corresponding to the watermark is formed by printing (see, for example, Patent Document 1).

Further, as one of the watermarking techniques by printing, a watermarked form paper is disclosed in which a light-shielding ink is partially formed on a paper surface to form a watermark mark portion and writing information is printed on the watermark mark portion. (See, for example, Patent Document 2). The technique of Patent Document 2 uses titanium oxide having an ability to block light as a watermark ink, and suppresses the change of the watermark with time and forms a fine watermark.

On the other hand, in the watermarking technique applied by the printing technique as in Patent Document 1 and Patent Document 2, the applicant uses the substrate as a printed matter having high contrast when observed under transmitted light and a clear image can be visually recognized. We have proposed a printed matter formed by superimposing a pattern formed by an ink containing a metal pigment on the upper side and suppressing permeability, and a pattern formed by an ink having a penetrating component on the upper side (see, for example, Patent Document 3). ..

While various techniques have been proposed in which a pattern is formed by using an ink having a penetrating component or an ink having a light blocking property as described above, the pattern is invisible under reflected light, and the image can be visually recognized under transmitted light. Applicants have applied that, as a printed matter that produces a new effect when observed under transmitted light, a printed pattern consisting of two regions that are the same color when observed under reflected light and cannot be visually recognized separately is produced under transmitted light. We have proposed a printed matter in which a printed pattern can be visually recognized due to a difference in brightness between the two regions when observed with (see, for example, Patent Document 4).

Japanese Unexamined Patent Publication No. 6-228900 Japanese Patent No. 3444535 Japanese Patent No. 5990754 Japanese Patent No. 6014877

However, in the printed matter of Patent Document 4, the printed pattern is visually recognized as having the same color under the reflected light, and the color is changed and visually recognized under the transmitted light. However, it has been desired to further improve the effect from the viewpoint of authenticity discrimination and counterfeit suppression technology. That is, there is a problem that the contrast between the two regions that can be visually recognized when observing under transmitted light is further increased.

An object of the present invention is to solve the above-mentioned problems, and in a printed matter which is uniform in color under reflected light and whose color changes under transmitted light so that an image can be visually recognized, a transmitted latent image having improved contrast is particularly provided. It provides an image print.

The transmitted latent image printed matter of the present invention includes a printed image composed of a first region and a second region on a transparent base material, and a first coloring material having a color different from that of the base material is provided in the first region. A first image in which a plurality of first image elements formed by the above are arranged is formed, and a second image in which a plurality of second image elements having a color different from that of the base material are arranged is formed in the second region. The second image is i) the second image element formed by the first color material is arranged higher than the area ratio of the first image element and has a darker color than the first image. , Or ii) A second image element formed of a second color material having the same color as the first color material but having a different density is arranged higher than the area ratio of the first image element, and A color darker than that of the first image, or iii) A plurality of second image elements formed by the second B color material having a hue different from that of the first color material are arranged, and a color different from that of the first image. The first region and the second region are formed by laminating a third image element formed of a third color material containing a light-blocking material on at least a part of the second image element. Is formed to have the same color under reflected light, and when observed under transmitted light, the first region and the second region are separated by the difference in the amount of transmitted light and visually recognized.

Further, in the case of i) or ii), the transmitted latent image printed matter of the present invention is characterized in that the third image element is formed of a white third color material.

Further, in the case of the transmitted latent image printed matter of the present invention, in the case of iii), the third image element is a third color material having a color different from that of the first color material, the second color material, and the second B color material. The color of the second region in which the third image element is laminated on the second image element is the same as the color of the first region under reflected light.

Further, in the transmitted latent image printed matter of the present invention, the first image further has a plurality of first A image elements formed of a base material or a first A color material having a hue different from that of the first color material. The second image is further formed by the first A color material, has a plurality of second A image elements arranged higher than the area ratio of the first A image element, and is at least a part of the second A image element. It is characterized in that the first region and the second region are formed to have the same color under reflected light by laminating the third image element formed by the white third color material.

In the transmitted latent image printed matter of the present invention, when a printed image consisting of two regions formed in the same color under reflected light is observed under transmitted light, a difference in brightness occurs due to a difference in the amount of transmitted light, and the two regions are separated. The contrast between the two regions, which can be visually recognized and can be discriminated by authenticity, and which can be visually recognized by being separated by observation under transmitted light, is much higher than that of the prior art, so that the authenticity can be discriminated. Excellent.

It is an overview view which observed the transmitted latent image printed matter of this invention under the reflected light. It is an overview view which observed the transmitted latent image printed matter of this invention under the transmitted light. It is a figure which shows the structure of the printed image. It is a figure which shows the structure of the 1st region. It is a figure which shows the structure of the 2nd region. It is a figure which shows the composition of the 2nd image in the 2nd region. It is a figure which shows the composition of the 3rd image in the 2nd region. It is a schematic diagram in which a third image element is superposed on the second image element. It is a figure which shows the laminated state of the printed image. It is a figure which shows the observation state of the transmission latent image printed matter. The first image element is an overview view composed of image lines. The second image element is an overview view composed of image lines. It is a figure which shows an example of the 1st region and the 2nd region. It is a figure which shows the structure of the 1st image of 3rd Embodiment. It is a figure which shows the structure of the 2nd image of 3rd Embodiment. It is a figure which shows the structure of the 3rd image of the 3rd Embodiment.

A mode 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 as long as it is within the scope of the technical idea described in the claims.

FIG. 1 shows a transmitted latent image printed matter (1) in the present invention. The transmitted latent image printed matter (1) of the present invention is formed by forming a printed image (3) having a color different from that of the base material (2) on the base material (2). When the transmitted latent image printed matter (1) of the present invention is observed under reflected light, the printed image (3) is observed at a uniform density as shown in FIG.

Next, FIG. 2 shows a state in which the transmitted latent image printed matter (1) in the present invention is observed under transmitted light. What was a printed image (3) having a uniform density under the reflected light is observed as a printed image (3) having a different pattern due to a difference in shade under the transmitted light. The transmitted latent image printed matter (1) of the present invention will be described below.

(Base material)
The base material (2) constituting the transmitted latent image printed matter (1) in the present invention needs to have a property of transmitting light like high-quality paper, coated paper, film or plastic, that is, so-called light transmission. However, opaque plastics and metals cannot be effective under transmitted light.

(First Embodiment)
FIG. 3 shows the configuration of the printed image (3) of the first embodiment. The printed image (3) has two regions, a first region (4) and a second region (5). In the present embodiment, the printed image (3) represents a basket pattern, the first region (4) is an outer peripheral portion composed of a fan pattern, and the second region (5) is a windmill pattern. It forms a central portion composed of, and becomes a basket pattern of the printed image (3) as a composite pattern. The printed image (3) may have any color other than transparent as long as it has a color different from that of the base material (2). The "color" in the present invention represents a color including the concepts of hue, saturation and lightness. Further, the "coloring material" used for forming the image element will be referred to as "ink" hereafter.

(First area)
FIG. 4 is a diagram showing the configuration of the first region (4). As shown in the enlarged view of FIG. 4, the first region (4) has a predetermined area ratio by arranging a plurality of first image elements (6) by the first ink at a predetermined pitch. It is formed as the first image (8). In the present invention, the "area ratio" is the ratio of the areas of the elements arranged in a certain area of the base material (2). As the first ink for forming the first image element (6), a colored ink such as a process ink or a special color ink is used. The first ink is a colored ink that does not contain a light-blocking material used for forming an image in the second region (5), which will be described later.

In FIG. 4, the first image element (6) shows an example composed of circular pixels, but in the present invention, the first image element (6) may have an image configuration. Alternatively, it may be configured by combining an image line and a pixel. In the present invention, the "pixel" is the printing halftone dot itself, which is the smallest unit for forming a printed image, or a block of image elements formed by aggregating a plurality of printing halftone dots, such as a circle or a triangle. In addition to polygons such as quadrangles and various figures such as stars, letters, symbols, numbers, etc. are also included. On the other hand, the "image line" is an image element formed by continuously arranging printing halftone dots, which is the smallest unit for forming a printed image, in a specific direction, and is a dotted line, a broken line of a broken line, a straight line, a curved line, and an image element. Wavy lines etc. are included. The same applies to the second image element (7) and the third image element (10), which will be described later. In the following description, an example in which each element is composed of circular pixels will be described.

In the example of FIG. 4, the first image element (6) is an example composed of circular pixels, and in this case, as shown in the enlarged view of FIG. 4, the first image composed of circular pixels. A plurality of elements (6) are arranged at a first pitch (P1a) in the first A direction (VA1) and at a first b pitch (P1b) in the first B direction (VB1). The direction (VA1) of the first A and the direction (VB1) of the first B where the first image element (6) is arranged are not limited to the directions shown in FIG. 4 as long as they are different directions.

In the transmitted latent image printed matter (1) of the present invention, the first region (4) and the second region (5) are visually recognized as a printed image (3) having a uniform density under reflected light. An image having a uniform density is formed in each of the first region (4) and the second region (5). The size of each element and the pitch at which each element is arranged are sufficiently fine so that the shape and color of the first image element (6) composed of pixels, image lines, or a combination thereof cannot be visually recognized. There is a need. The size of each element composed of pixels is such that the size of the first image element (6) in the first A direction (VA1) is "WA1" and the size of the first image element (6) is the first in the first B direction (VB1). Assuming that the size of the image element (6) is "WB1", the size of the first image element (WA1, WB1) needs to be formed in the range of 10 μm to 500 μm, and the pitch of the first a. The pitch (P1a) and the first b pitch (P1b) are preferably in the range of 80 μm to 1,500 μm, preferably in the range of 100 μm to 1,000 μm.

(Second area)
As shown in FIG. 5A, the second region (5) is composed of a second image (9) and a third image (11), and the second image (9) and the third image. As shown in FIG. 5B, the stacking relationship of (11) is such that the third image (11) overlaps the second image (9). Hereinafter, the configurations of the second image (9) and the third image (11) will be described.

(Second image)
FIG. 6 is a diagram showing the configuration of the second image (9). In the second image (9), as shown in the enlarged view of FIG. 6, the second image element (7) with the same first ink as the ink forming the first image element (6) is predetermined. By arranging a plurality of them on the pitch, they have a predetermined area ratio and are formed in the second region (5). The second image element (7) shown in the enlarged view of FIG. 6 shows an example composed of circular pixels, in which case the second image element (7) is in the direction of the second A (VA2). A plurality of images are arranged at the second pitch (P2a) and the second B direction (VB2) at the second pitch (P2b). The direction (VA2) of the second A and the direction (VB2) of the second B where the second image element (7) is arranged are not limited to the directions shown in FIG. 6 as long as they are different directions. Further, the direction in which the second image element (7) is arranged (VA2, VB2) may be the same as the direction in which the first image element (6) is arranged (VA1, VB1). It may be in a different direction.

Also in the second image (9), in order to form an image having a uniform density, the size of the second image element (7) in the second A direction (VA2) is set to "WA2" and the second B direction. Assuming that the size to (VB2) is "WB2", the size of the second image element (WA2, WB2) needs to be formed in the range of 10 μm to 500 μm, and the pitch (P2a, P2b) is A range of 80 μm to 1,500 μm is suitable, and a range of 100 μm to 1,000 μm is preferable.

The area ratio of the second image (9) must be higher than the area ratio of the first image (8). The reason for this is that the image density of the second region (5) becomes lighter due to the lamination of the third image (11) made of the white ink having the light blocking property, which will be described later. The lower second image (9) needs to be designed in advance with a higher area ratio than the first image (8).

As a specific example for making the area ratio of the second image (9) higher than the area ratio of the first image (8), the size of the circular pixel of the second image element (7) is set to the size of the first image element. There is a configuration in which the first image element (6) and the second image element (7) are arranged at the same pitch, which is larger than (6). In this case, by making the size (WA2, WB2) of the second image element (7) described above larger than the size (WA1, WB1) of the first image element (6), the second image (9) ) Can be made higher than the area ratio of the first image (8). Further, as another specific example, the first image element (6) and the second image element (7) are circular pixels having the same size, and the pitch (P2a, There is a configuration in which P2b) is designed to be smaller than the pitch (P1a, P1b) in which the first image element (6) is arranged. The second image (9) having this configuration is formed as an image having a darker color than the first image (8) because the area ratio is higher than that of the first image (8).

(Third image)
FIG. 7 is a diagram showing the configuration of the third image (11). As shown in the enlarged view of FIG. 7, the third image (11) formed by being laminated on the second image (9) of the second region (5) is white and light. By arranging a plurality of third image elements (10) made of ink having a blocking property at a predetermined pitch, a third image (11) having a predetermined area ratio is formed. Then, the third image element (10) is arranged in the direction (VA2, VB2) where the second image element (7) is arranged at the same pitch (P3a, P3b) as the second image element (7). By being formed, it is formed so as to overlap the second image element (7).

Assuming that the size of the third image element (10) in the third A direction (VA3) is "WA3" and the size in the third B direction (VB3) is "WB3", the third image element The size (WA3, WB3) of (10) may be the same size as that of the second image element (7) or may be a different size. However, since the third image (11) also forms an image having a uniform density, it needs to be formed in the range of 10 μm to 500 μm. Further, when the second image element (7) and the third image element (10) have different sizes, the third image element (10) may be designed to be larger than the second image element (7). It may be designed to be small. However, it is necessary to adjust the size of the third image element (10) so that the first region (4) and the second region (5), which will be described later, are formed in the same color.

Further, FIG. 8A shows a state in which the second image element (7) indicated by the horizontal line and the third image element (10) indicated by the vertical line coincide with each other at the same position and overlap each other. As a result, the second image element (7) and the third image element (10) having the same size are completely arranged so that the second image element (7) and the third image element (10) overlap each other. May match and overlap. Further, as shown in FIG. 8B, a second image element (7) and a part of the third image element (10) having the same size may be arranged so as to overlap each other. Further, in FIG. 8 (c), the second image element (7) is smaller than the third image element (10), and the entire second image element (7) is covered by the third image element (10). Although the state in which they are arranged is shown, the second image element (7) and the third image element (10) having different sizes may be arranged as shown in the figure. Further, as shown in FIG. 8D, the third image element (10) is smaller than the second image element (7), and the third image is partly above the second image element (7). The entire element (10) may be arranged so as to overlap. In addition, as shown in FIG. 8 (e), a part of the second image element (7) and the third image element (10) having different sizes may overlap each other. However, the arrangement is adjusted so that the second image element (7) and the third image element (10) overlap each other so that the first region (4) and the second region (5), which will be described later, are formed in the same color. There is a need to.

As the ink forming the third image element (10), an ink containing a metal pigment is used because it has a light blocking property. Further, in the first embodiment, the light-blocking ink forming the third image element (10) is white, and as an example of the light-blocking white ink, titanium oxide, which is a metal pigment, is used. There is a blended ink.

(Explanation of color matching)
Subsequently, the configuration and the reason why the first region (4) and the second region (5) of the present invention are formed as a printed image (3) of the same color under reflected light will be described. As a specific example of the first ink, assuming that a blue colored ink is used and the first image (8) is formed with an area ratio of 45% and the second image (9) is formed with an area ratio of 80%, the second image (8) is formed with an area ratio of 80%. Image (9) has a higher area ratio than the first image (8), so that the image (9) is formed in a dark blue color. Further, when the third image (11) made of white and light-blocking ink is laminated on the second image (9), the second region (5) is under reflected light. Is visually recognized as a mixture of the dark blue color of the second image (9) and the white color of the third image (11). In this way, the dark blue and white are mixed and the dark blue color becomes lighter, so that the color of the second region (5) under the reflected light becomes the same color as the blue of the first region (4). can do.

The conditions for forming the first image (8) and the second image (9) formed at different area ratios into the same color under reflected light are the color of the first ink to be used and the first. The area ratio of the first image (8) and the second image (9), the ratio of the area where the second image element (7) and the third image element (10) overlap each other, and the third image element (10). Since it depends on the color mixing condition or the ink density of the ink forming the above, the conditions for equal coloration may be confirmed in advance and applied as the printing conditions for the first region (4) and the second region (5).

For example, a third image element (10) in which the first image (8) is formed with an area ratio of 45% and the second image (9) is formed with an area ratio of 80% to form the third image (11). As shown in FIG. 8 (b), the first region (4) and the second region (5) have the same color when the image is formed in the state shown in FIG. 8 (a). When a part of the second image element (7) and the third image element (10) overlaps, the area where the third image element (10) overlaps becomes smaller, so that the second image element (7) becomes lighter. The effect is low. In such a case, the area ratio of the first image (8) is made higher than 45%, or the density of the third image element (10) is increased. Specifically, a white ink having a light blocking property. By increasing the amount of transition of, the color matching relationship between the first region (4) and the second region (5) can be constructed.

Further, the third image element (10) is formed by forming the first image (8) with an area ratio of 45% and the second image (9) with an area ratio of 80% to form the third image (11). Is formed in the state shown in FIG. 8A, the area ratio of the first image (8) is set with respect to the condition that the first region (4) and the second region (5) have the same color. When it is increased, as shown in FIG. 8D, the third image element (10) is reduced or the density of the third image element (10) is decreased, and specifically, it has a light blocking property. By reducing the transfer amount of the white ink and reducing the degree of fading of the second image element (7), it is possible to form a color matching relationship between the first region (4) and the second region (5). can.

Further, the third image element (10) is formed by forming the first image (8) with an area ratio of 45% and the second image (9) with an area ratio of 80% to form the third image (11). Is formed in the state shown in FIG. 8A, the area ratio of the first image (8) is set with respect to the condition that the first region (4) and the second region (5) have the same color. When it is lowered, the area ratio of the second image element (7) is lowered as shown in FIG. 8C, or the density of the third image element (10) is increased. Specifically, the light is blocked. By increasing the transfer amount of the white ink having the property, it is possible to form a color matching relationship between the first region (4) and the second region (5).

(Cross-sectional structure)
As described above, FIG. 9 shows an example of the laminated state of the printed image (3) formed as described above. A part of the printed image (3), the cross-sectional structure of XX'is shown below the printed image (3). In the first region (4), the first image (8) by the first image element (6) is formed above the substrate (2), and in the second region (5), the second image (5). The third image (11) by the third image element (10) is formed by laminating on the second image (9) by the image element (7) of. In the present invention, as a method of forming each image element (6, 7, 10), there is a method of using a printing machine such as offset printing, flexographic printing, screen printing, or a method of using a laser printer.

(Observation under reflected light)
FIG. 10A shows a state in which the transmitted latent image printed matter (1) formed with the above configuration is observed under reflected light. As shown in FIG. 10A, when the transmitted latent image printed matter (1) is observed by the observer (E1) of the reflected image under the reflected light from the light source (L1), the first region (3) of the printed image (3) is observed. 4) and the second region (5) are observed in the same color, and the cage pattern can be recognized. This is because, as described above, the first image element (6), the second image element (7), and the third image element (7) so that the first region (4) and the second region (5) are perceived as having the same color. This is because the image element (10) of the above is appropriately formed. The term "equal colors" as used in the present invention refers to a state in which two colors are close to each other so that the observer can feel that they are the same color when the images are combined without paying attention. Specifically, a numerical value having a color difference ΔE (in the present invention, the CIE1976L * a * b * color difference formula is used) of 7 or less is defined as a color matching in the present invention.

(Observation under transmitted light)
FIG. 10B shows an observation state in which the transmitted latent image printed matter (1) is arranged between the observer (E2) of the transmitted image and the light source (L2). When the transmitted latent image printed matter (1) is observed under transmitted light as shown in FIG. 10 (b), the second region (5) becomes darker than the first region (4) and has the same color under reflected light. The two areas visually recognized in the above are divided into two areas, and the first image (8) "fan pattern" and the second image (9) "windmill pattern" can be visually recognized. This is the amount of light transmitted through the base material (2) by the light source (L2), the amount of light transmitted through the first image element (6) by the first ink in the first region (4), and the base material (4). In addition to the amount of light transmitted through 2) being perceived, in one second region (5), the area ratio of the second image (9) is higher than the area ratio of the first image (8). That is, because the area of the second image element (7) that blocks light is large, it becomes darker than the first region (4). Further, the light transmitted through the second image (9) is further blocked by the third image element (10) to become darker, resulting in the first region (4) and the second. This is because a clear difference in brightness is generated in the region (5) and the image is visually recognized.

In the transmitted latent image printed matter (1) of the first embodiment of the present invention, the first image (8) and the second image (9), which have a difference in contrast due to the difference in area ratio, are provided to provide light. The effect of obtaining a difference in brightness underneath and the effect of blocking light by the third image (11) increase the contrast of the first region (4) and the second region (5) under transmitted light. There is. Specifically, in the first embodiment of the present invention, in order to increase the area ratio of the third image element (10) formed by the ink having a light blocking property, the third image element (10) is used. The area ratio of the overlapping second image element (7) is higher than the area ratio of the first image element (6). Further, by overlapping the white third image element (10) with the second image element (7) having a high area ratio, the first region (4) and the second region (5) are made the same color. , The effect of blocking light in the second region (5) can be enhanced, that is, light and dark under transmitted light due to the difference in area ratio between the first image (8) and the second image (9). Due to the synergistic effect of blocking light by a third image element (10) that overlaps a second image element (7) with a high difference and area ratio, the first region (4) and the second region (4) under transmitted light ( The difference in brightness due to 5) can be obtained to the maximum.

(Example of image elements composed of strokes)
The example in which the first image element (6), the second image element (7), and the third image element (10) are composed of circular pixels has been described above. An example will be described.

FIG. 11 is a diagram showing an example in which the first image element (6) is composed of image lines. In this case, as shown in the enlarged view of FIG. 11, the first image element having a line width (WL1) is shown. A plurality of (6) are arranged in the direction of the first A (VA1) at the pitch (P1a) of the first a.

FIG. 12 is a diagram showing an example in which the second image element (7) is composed of image lines. In this case, as shown in the enlarged view of FIG. 12, the second image element having a line width (WL2) is shown. A plurality of (7) are arranged in the second A direction (VA2) at the second pitch (P2a). The directions in which the first image element (6) and the second image element (7) are arranged may be the same direction or may be different directions.

As in the case where each image element is composed of circular pixels, the area ratio of the second image (9) is higher than that of the first image (8), so that the line width of the second image element (7) is higher. (WL2) is made larger than the line width (WL1) of the first image element (6) and arranged at the same pitch, or the first image element (6) and the second image element (7) are the same. The line width is set so that the pitch (P2a) of the second a is designed to be smaller than the pitch (P1a) of the first a and arranged.

When the third image element (10) is composed of image lines, the configuration is the same as that of the second image element (7) shown in FIG. 12, and the third image element (10) having a line width (WL3) is the same. ) Are arranged at the pitch (P2a) of the second a in the same direction (VA2) of the second A as the second image element (7) (not shown). Further, the third image element (10) is formed so as to overlap the second image element (7).

Even when the first image element (6), the second image element (7), and the third image element (10) are formed by strokes, the first region (4) and the second region (5) are formed. ) Form an image having a uniform density in both the first region (4) and the second region (5) in order to be visually recognized as a printed image (3) having a uniform density under reflected light. Here, it is necessary to make the size of each element and the pitch at which each element is arranged sufficiently fine so that the shape and color of each element composed of the image lines cannot be visually recognized. Specifically, the line widths (WL1, WL2, WL3) of the first image element, the second image element, and the third image element need to be formed in the range of 10 μm to 500 μm, and the first aa The pitch (P1a) and the pitch (P2a) of the second a are preferably in the range of 80 μm to 1,500 μm, and preferably in the range of 100 μm to 1,000 μm. When each element is composed of pixels, the first image (8) and the second image (8) composed of image lines are arranged in order to make the first region (4) and the second region (5) the same color. It is necessary to adjust the area ratio of the image (9) and the third image (11), the ratio of the area where the second image element (7) and the third image element (10) overlap each other, and the like.

As described above, regarding the arrangement of the second image element (7) and the third image element (10), an example composed of pixels and image lines has been described, but the first region (4) and the second region (4) and the second region ( If the configuration satisfies the color matching relationship with 5), the third image (11) covers all of the second image element (7) and covers the entire second region (5), so-called. , May be a solid pattern configuration. Specifically, when the color of the base material (2) is the same as "white", which is the color of the ink forming the third image element (10), the third base material (2) is formed above the base material (2). Since the image element (10) cannot be visually recognized as having the same color, even if the third image (11) is composed of a solid pattern, the color matching relationship between the first region (4) and the second region (5) is broken. Never. Further, even when the color of the base material (2) is different from that of white and is colored, the color difference ΔE between the color of the base material (2) and the color of the portion where the base material (2) is printed in white is 7 or less. In the case of, the influence of the color of the base material (2) on the printed image (3) is extremely small, and even if the third image (11) is a solid pattern, the first region (4) and the second region (4) 5) can be formed in the same color. In this way, when the third image (11) has a solid pattern configuration, the effect of blocking light by the third image element (10) above the second image element (7) is imparted. In addition, by forming the third image element (10) above the base material (2), the effect of blocking light can be imparted, and the second region (5) can be formed in the observed state under transmitted light. Since it can be observed darker, it becomes easier to recognize the image.

Further, in the description so far, an example in which the first region (4) is composed of a fan pattern and the second region (5) is composed of a windmill pattern has been described. The pattern formed in the second region (5) is not limited to this, and as shown in FIG. 13 (a), the first region (4) has a star shape and the second region (5). May be configured as the background pattern. Further, the first region (4) is not limited to the star shape, and may be another figure, a character, a symbol, or the like. Further, as shown in FIG. 13B, the second region (5) may be configured as a star shape, and the first region (4) may be configured as the background pattern thereof.

(Second Embodiment)
In the first embodiment, the configuration in which the first image element (6) and the second image element (7) are formed by the same first ink has been described, but next, the second image element ( A form in which 7) is formed by a second ink having a color different from that of the first ink forming the first image element (6) will be described. In the second embodiment, the composition of the second ink consists of an ink having the same hue as the first ink and a different density (hereinafter referred to as the second A ink) and the first ink. There are two types of inks (hereinafter referred to as second B inks) having different hues, and the respective configurations will be described in order.

First, a configuration will be described in which the second image element (7) is formed by the second A ink having the same hue as the first ink and having a different density. Further, in order to explain the first configuration of the second embodiment in an easy-to-understand manner, an example in which a light blue ink is used as the first ink and a dark blue ink is used as the second A ink will be described. .. In the second embodiment, the hues of the first ink and the second A ink are not limited to blue, and may be any of red, yellow, green, purple, and the like.

Also in the first configuration of the second embodiment, by increasing the area ratio of the third image element (10), the effect of blocking light in the second region (5) can be obtained. The area ratio of the second image element (7) formed by the ink of 2A is formed higher than the area ratio of the first image element (6) formed by the first ink, and the plurality of second images are formed. The second image (9) composed of the element (7) is formed as a darker image than the first image (8). As described above, the dark blue second A ink forms the second image element (7), the light blue first ink forms the first image element (6), and the second image. When the area ratio of the element (7) is formed higher than the area ratio of the first image element (6), the second image (9) becomes the first due to the difference in the density of the ink and the area ratio of the image element. It is formed as a darker image than the image (8).

On the other hand, unlike the above-mentioned examples of the first ink and the second A ink, a dark blue ink may be used as the first ink and a light blue ink may be used as the second A ink. Unlike the present invention, for example, when the first image element (6) and the second image element (7) are formed at the same area ratio, the first image element formed by the dark blue first ink ( The first image (8) consisting of 6) is darker blue than the second image (9) consisting of the second image element (7) formed by the light blue second A ink, but the second. The shade of color of the second image (9) can be adjusted by the area ratio of the second image element (7), and the second image (9) is formed with a darker color than the first image (8). As described above, the area ratio of the second image element (7) may be higher than the area ratio of the first image element (6). As described above, even when the second A ink has the same hue as the first ink and has a different density, the area ratio is higher than that of the first image element (6) as in the first embodiment. Moreover, it is possible to form a second image (9) having a darker color than the first image (8).

The configuration of the third image (11) formed above the second image (9) is as described above, and is white and light-blocking above the dark blue second image (9). By forming the third image (11) using the ink having Can be formed into. In order to form the first region (4) and the second region (5) in the same color, the area ratios of the first image (8) and the second image (9), and the second image The ratio of the area where the element (7) and the third image element (10) overlap each other may be appropriately set.

Also in the first configuration of the second embodiment having the above configuration, the area ratio of the second image element (7) is higher than the area ratio of the first image element (6), so that the light It is possible to design a wide area formed by overlapping the third image element (10) with the ink having a blocking property, and to make the contrast between the first area (4) and the second area (5) under transmitted light. It can be designed large.

Next, as a second configuration of the second embodiment, a configuration in which the second image element (7) is formed by the second B ink having a hue different from that of the first ink will be described. Further, in order to explain the second configuration of the second embodiment in an easy-to-understand manner, an example in which a green ink is used as the first ink and a yellow ink is used as the second B ink will be described. ..

Also in the second configuration of the second embodiment, by increasing the area ratio of the third image element (10), the effect of blocking light in the second region (5) can be obtained. The area ratio of the second image element (7) formed by the ink of the above is higher than the area ratio of the first image element (6). For example, when the first image element (6) is formed by the first green ink, the first image (8) shows the green color of the first ink with a uniform density and the yellow second B. When the second image element (7) is formed by the ink, the yellow color due to the second B ink is visually recognized in the second image (9) at a uniform density. Here, the area ratio of the second image element is higher than the area ratio of the first image element.

In this way, in order to make the first region (4) and the second region (5) in which the green first image (8) and the yellow second image (9) are formed the same color, the first In the ink having a light blocking property forming the third image (11), a color mixed by overlapping the third image (11) on the second image (9) is a color mixed with the first image (8). ) Use an ink with a hue that is the same as the color. In this case, by using a blue light-blocking ink, the second region (5) becomes green, which is a mixture of blue and yellow, and can be made the same color as the first region (4). In order to form the first image (8) and the second image (9) in the same color, the area ratios of the first image (8) and the second image (9), and the second image The ratio of the area where the image element (7) and the third image element (10) overlap each other may be appropriately set.

As described above, a blue light-blocking ink can be easily produced by mixing titanium oxide with a blue coloring pigment or coloring dye. Here, the first ink is green, the second B ink is yellow, and the light-blocking ink is blue. However, the second image (9) and the light-blocking property of the second B ink are described. If the color of the second region (5) due to the color mixing of the third image (11) by the ink having the same color as that of the first region (4), the first ink, the second B ink and The color of the ink having a light blocking property is not limited to this.

Also in the second configuration of the second embodiment having the above configuration, the area ratio of the second image element (7) is higher than the area ratio of the first image element (6), so that light is blocked. It is possible to design a wide area formed by superimposing the third image element (10) made of the ink having the property, and increase the contrast between the first area (4) and the second area (5) under transmitted light. Can be designed.

Also in the second embodiment, when the color of the light-blocking ink forming the third image (11) and the color of the base material (2) are the same, the third image (11) is solid. It may be the composition of the pattern. As a specific example, as in the second configuration of the second embodiment described above, the light-blocking ink forming the third image (11) is blue, and the base material (2) is In the case of the same blue color, the third image (11) and the base material (2) formed above the base material (2) as a solid pattern are visually recognized as the same color, so that they are different from the first region (4). Since the color matching relationship of the second region (5) is not broken, the third image (11) may be configured as a solid pattern. Further, in the first embodiment of the second embodiment, even when the base material (2) is white, the third image (11) may have a solid pattern configuration.

The above is the configuration of the second embodiment. Similar to the transmitted latent image printed matter (1) of the first embodiment, when observed under reflected light to transmitted light, the two regions are bright and dark. It can be visually recognized as a divided image due to a difference.

(Third Embodiment)
Next, as a third embodiment, a mode in which the first image (8) and the second image (9) are formed by a plurality of image elements using inks of a plurality of colors having different hues will be described. In the following description, an example in which the image element is composed of circular pixels will be described, but as described above, the image element is not limited and may be an image line.

(First area)
As shown in FIG. 14, the first region (4) includes a first image element (6) produced by the first ink and a first image element (6) produced by the first ink having a hue different from that of the first ink. By arranging a plurality of (6') at a predetermined pitch, the first image (8) having a predetermined area ratio is formed. As the first ink and the first A ink, as described above, ordinary colored inks such as process inks and special color inks may be used, and colored inks that do not contain light-blocking metal pigments are used. For example, when red ink is used as the first ink and indigo ink is used as the first ink, the first region (4) is formed as purple in which the red ink and the indigo ink are mixed.

In FIG. 14, the first image element (6) and the first image element (6') are arranged so as not to overlap each other, but the first ink and the first A ink are mixed and the observer can see the colors. As long as the configuration feels uniform in color, there are no restrictions on the arrangement of the first image element (6) and the first image element (6'), and the elements may overlap each other. Further, the arrangement may be such that the halftone dot angle in the process printing is different for each color.

(Second image)
In FIG. 15, the second region (5) is the second image element (7) with the same first ink as the ink forming the first image (8) and the second A with the first A ink. By arranging a plurality of image elements (7') at a predetermined pitch, a second image (9) having a predetermined image area ratio is formed. Also in FIG. 15, the second image element (7) and the second image element (7') are arranged so as not to overlap each other, but the first ink and the first A ink are mixed and the observer can see the colors. As long as the configuration feels uniform in color, there are no restrictions on the arrangement of the second image element (7) and the second image element (7'), and the elements may overlap each other. Further, the arrangement may be such that the halftone dot angle in the process printing is different for each color.

Also in the third embodiment, the area ratio of the second image (9) needs to be higher than the area ratio of the first image (8). The image element (7) has a higher area ratio than the first image element (6) with the first ink, and the second A image element (7') with the first ink is due to the first A ink. It is formed with a configuration having a higher area ratio than the image element (6') of the first A. With this configuration, in the second image (9), the color in which the color of the first ink and the color of the first ink are mixed can be visually recognized as a darker color than that of the first image (8).

(Third image)
As described above, the third image (11) has a configuration in which a plurality of third image elements (10) made of white ink having a light blocking property are arranged at a predetermined pitch, and the third embodiment In the third image element (10), in detail, the second image element (7) constituting the second image (9) and the second image element (7') corresponding to the second image element (7') are overlapped with each other. Is. FIG. 16 is a diagram showing the configuration of the second image element (7) shown in FIG. 15 and the third image element corresponding to the image element (7') of the second A, and is an enlarged view of FIG. Then, the third image element corresponding to the second image element (7) is indicated by the reference numeral "10", and the third image element overlapping corresponding to the second image element (7') is indicated by the reference numeral "10". It is shown by "10'".

In the third embodiment, the first region (4) and the second region (5) are increased by the amount of the number of colors forming the printed image (3) as compared with the first embodiment. ) Needs adjustment to make the colors the same. Specifically, in the first embodiment, the first image element (6) and the second image element (7) formed by the first ink at different area ratios are formed in the same color. The principle may be the same. In the third embodiment, the third image element (10) and the third image element (10') are overlapped with each other to make the colors equal. The third image (11) may have a solid pattern as long as it satisfies the color matching relationship between the first region (4) and the second region (5).

When the transmitted latent image printed matter (1) of the third embodiment formed by the above configuration is observed under reflected light, the printed image (3) shows the color of the first ink and the color of the first ink. The first image (8) and the second image (9) form a printed image (3) using inks having different hues. Compared with the first embodiment and the second embodiment, the degree of freedom of colors for expressing the printed image (3) is widened.

Hereinafter, examples of the transmitted latent image printed matter (1) specifically produced according to the embodiment for carrying out the above-mentioned invention will be described, but of course, the present invention is not limited to this example.

(Example 1)
Example 1 is a transmitted latent image printed matter (1) having the configuration of the first embodiment, and specifically, a transmitted latent image printed matter (1) having the configurations shown in FIGS. 1 to 7 was produced. .. High-quality white paper for color copying (basis weight 79 g / m2, whiteness 90%, paper thickness 95 μm) is used as the base material (2), and the printed image (3) is printed using graphic software for a PC. The image data described in the above was created, and a coloring material was added by a laser printer.

The first image element (6) is a circular pixel as shown in FIG. 4, and has design values: WA1 = WB1 = 60 μm, pitch P1a = P1b = 127 μm (200 lines, image area ratio of about 20%). , The first ink was formed as black.

The second image element (7) is a circular pixel as shown in FIG. 6, and has design values: WA2 = WB2 = 80 μm, pitch P2a = P2b = 127 μm (200 lines, image area ratio of about 30%). , The first ink was formed as black.

The third image element (10) was formed by using a white ink containing titanium oxide in a solid pattern configuration (image area ratio 100%) covering all of the second image element (7). The color difference ΔE between the color of the base material (2) and the color of the portion solidly printed with white ink containing titanium oxide on the base material (2) was 1.69 (measured value by a spectrophotometer). ..

When the transmitted latent image printed matter (1) produced as described above is observed under the reflected light shown in FIG. 10 (a), the first region (4) and the second region (5) are visually recognized as having the same color. It could be observed as a uniform gray basket pattern. Further, when observed under transmitted light as shown in FIG. 10B, the second region (5) is visually recognized darker than the first region (4), and the wind turbine pattern and the outer peripheral portion of the fan pattern are separated. I was able to see it.

(Example 2)
The second embodiment is a transmission latent image printed matter (1) having the configuration of the third embodiment, and the first image (8) and the second image (9) are made of magenta and cyan having different hues. Using ink, a transmitted latent image printed matter (1) as shown in FIG. 1 was produced. The composition and production method of the base material (2) were the same as in Example 1.

The first image element (6) is a circular pixel as shown in FIG. 14, and has design values: WA1 = WB1 = 55 μm, pitch P2a = P2b = 127 μm (200 lines, image area ratio of about 15%). The arrangement angle θ was set to 15 degrees, and the first ink was formed as a cyan color.

The first image element (6') is a circular pixel as shown in FIG. 14, and has design values: WA1'= WB1'= 45 μm, pitch P2a'= P2b'= 127 μm (200 lines, image area ratio). Approximately 10%), the arrangement angle θ was set to 75 degrees, and the first A ink was formed as a magenta color.

The second image element (7) is a circular pixel as shown in FIG. 15, and has design values: WA2 = WB2 = 78 μm, pitch P3a = P3b = 127 μm (200 lines, image area ratio of about 30%). The arrangement angle θ was set to 15 degrees, and the first ink was formed as a cyan color.

The second A image element (7') is a circular pixel as shown in FIG. 15, and has design values: WA2'= WB2'= 64 μm, pitch P3a'= P3b'= 127 μm (200 lines, image area ratio). Approximately 20%), the arrangement angle θ was set to 75 degrees, and the first A ink was formed as a magenta color.

The third image element (10) has a configuration in which all of the second image element (7) and the second image element (7') are covered with a solid image (image area ratio 100%), and contains titanium oxide. It was formed in white.

When the transmitted latent image printed matter (1) produced as described above is observed under the reflected light shown in FIG. 10 (a), the first region (4) and the second region (5) are visually recognized as having the same color. It was observable as a uniform pale purple cage pattern in which cyan and magenta were mixed. Further, when observed under transmitted light as shown in FIG. 10B, the second region (5) seems to be darker than the first region (4), and the wind turbine pattern and the outer peripheral portion of the fan pattern are separated. I was able to see it.

(Example 3)
Example 3 is a transmitted latent image printed matter (1) having the configuration of the second embodiment, in which the first image (8) is a light black ink and the second image (9) is a dark black ink. Was used to prepare a transmitted latent image printed matter (1) as shown in FIG. The composition and production method of the base material (2) were the same as in Example 1.

The first image element (6) is a circular pixel as shown in FIG. 4, and has design values: WA1 = WB1 = 35 μm, pitch P1a = P1b = 127 μm (image area ratio of about 6%), and the first image element (6). The ink was formed as pale black. The solid density of the first ink was 1.52 (measured value by a spectrophotometer).

The second image element (7) is a circular pixel as shown in FIG. 6, and has design values: WA2 = WB2 = 45 μm, pitch P2a = P2b = 127 μm (image area ratio of about 10%), and second A. The ink was formed in black, which was darker than the first ink. The solid density of the second A ink was 1.90 (measured value by a spectrophotometer).

The third image element (10) was formed by using a white ink containing titanium oxide in a solid pattern configuration (image area ratio 100%) covering all of the second image element (7).

When the transmitted latent image printed matter (1) produced as described above is observed under the reflected light shown in FIG. 10 (a), the first region (4) and the second region (5) are visually recognized as having the same color. It could be observed as a uniform gray basket pattern. Further, when observed under transmitted light as shown in FIG. 10B, the second region (5) is visually recognized darker than the first region (4), and the wind turbine pattern and the outer peripheral portion of the fan pattern are separated. I was able to see it.

(Example 4)
Example 4 is an example in which the color of the base material (2) is different from that of the transmitted latent image printed matter (1) produced by using the white base material (2) of Example 1, and three kinds of colors are used. It is a transmission latent image printed matter (1) produced using the base material (2) of. Table 1 shows the configuration of the base material (2) used in Example 4, and Table 2 shows the results of the transmitted latent image printed matter (1) prepared according to the base material (2) used. In addition, as a comparative example, Table 1 shows the configuration of the base material (2) used separately from Example 4, and Table 2 shows the results of the produced printed matter.

The three types of base materials (2) used in Example 4 are all high-quality colored paper, and as shown in Table 1, light blue, light red, and light yellow base materials (2) are used, respectively. There is. Further, as a comparative example, a blue base material (2) was used as shown in Table 1. For the three types of base material (2) used in Example 4 and the base material (2) used in Comparative Example, the same black ink as in Example 1 was used under the conditions shown in Table 2, respectively. The first image (8) and the second image (9) were formed. Further, in a solid pattern configuration (image area ratio 100%) covering all of the second image element (7), a white ink containing titanium oxide was used to form a third image (11).

In the printed matter of Example 4 and Comparative Example prepared as described above, the color difference ΔE between the base material (2) and the region where the solid pattern was formed by the white ink containing titanium oxide directly on the base material (2), and Table 2 shows the results of visually confirming the color matching state of the first region (4) and the second region (5) when observed under reflected light.

As shown in Table 2, in Examples 4-1 and 4-2, the color difference ΔE of the region formed by the white ink containing the base material (2) and titanium oxide as a solid pattern is as low as about 3, and the first The region (4) and the second region (5) were visually recognized in the same color under the reflected light, and the effect of concealing the image visually recognized under the transmitted light was high.

Further, when the region formed by the base material (2) of Example 4-3 and the white ink containing titanium oxide as a solid pattern was observed under reflected light, a slight difference in color was felt, but the first region was observed. The results of (4) and the second area (5) were difficult to distinguish. In the printed matter of Examples 4-1 to 4-3, when observed under transmitted light, the second region (5) was visually recognized darker than the first region (4), and the pattern of the wind turbine was observed. It was visible separately from the outer periphery of the fan pattern.

On the other hand, in the printed matter of the comparative example, the color difference ΔE in the region where the white ink containing the base material (2) and titanium oxide was formed as a solid pattern was larger than that of Example 4-3, and even by visual observation under reflected light, the third The result was that the first region (4) and the second region (5) were visually recognized separately.

1 Transmission latent image printed matter 2 Base material 3 Printed image 4 First area 5 Second area 6 First image element 6'First A image element 7 Second image element 7'Second A image element 8 First Image 9 Second image 10 Third image element 10'Third A image element 11 Third image E1 Reflected image observer E2 Transmitted image observer L1 Reflected light source L2 Transmitted light source VA1 First A direction VA2 First 2A direction VA3 3rdA direction VB1 1stB direction VB2 2ndB direction VB3 3rdB direction P1a, P2a, P3a, P1b, P2b, P3b Image element pitch WL1, WL2, WL3 Line width WA1, WA2, WA3 , WB1, WB2, WB3 Image element size

Claims (3)

A first color material having a color different from that of the base material is formed in the first region by providing a printed image composed of a first region and a second region on a transparent base material. A first image in which a plurality of image elements are arranged is formed, and a second image in which a plurality of second image elements having a color different from that of the base material are arranged is formed in the second region, and the second image is formed. In the image of i), the second image element formed by the first color material is arranged higher than the area ratio of the first image element and has a darker color than the first image. , Or ii) The second image element formed of the second A color material having the same color as the first color material but different in density is arranged higher than the area ratio of the first image element. And it is a darker color than the first image.
The first region and the second region are formed by laminating a third image element formed of a third color material containing a light-blocking material on at least a part of the second image element. Is formed in the same color under reflected light, and when observed under transmitted light, the first region and the second region are separated by the difference in the amount of transmitted light and visually recognized. .. The transmitted latent image printed matter according to claim 1, wherein in the case of i) or ii), the third image element is formed of the white third color material. The first image further has a plurality of first A image elements formed of the base material and the first A color material having a hue different from that of the first color material, and the second image further includes the first image. It has a plurality of second A image elements formed of the first A color material and arranged higher than the area ratio of the first A image element, and at least a part of the second A image element is white. A claim characterized in that the first region and the second region are formed in the same color under reflected light by laminating the third image element formed by the third coloring material. Item 2. The transmitted latent image printed matter according to Item 2.

Images