JP7204130B2 - Transmission latent image print - Google Patents

Description

INDUSTRIAL APPLICABILITY In the field of valuable printed matter such as banknotes, passports, negotiable securities, identification cards, cards, passage tickets, etc., which are security printed matter that require anti-counterfeiting effects, the present invention provides an image that is consistent under reflected light and transmitted light. It relates to a transmission latent image print in which the color of the part changes.

With the recent development of digital devices such as scanners, printers, and color copiers, it has become possible to easily produce elaborate copies of valuable printed materials. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeiting techniques that cannot be reproduced by printers and copiers are required.

As one of the anti-counterfeiting techniques, there is a so-called watermarking technique in which a pattern is formed by varying the density and thickness of paper and is visible under transmitted light. This watermarking technology enables authenticity to be determined in any environment as long as a certain amount of light is present. Nevertheless, it is still used in banknotes around the world.

Since the watermark technology must be formed at the stage of manufacturing the paper, it cannot be manufactured except by the paper manufacturer. As a method of quasi-reproducing, there is an anti-counterfeiting technology that uses a special penetrating ink in the printing process to print a transmissive image corresponding to this watermark (see, for example, Patent Document 1).

In addition, as one of the watermarking techniques by printing, a watermarked form paper is disclosed in which light-shielding ink is partially formed on a paper surface to form a watermark mark portion, and written information is printed thereon. (See, for example, Patent Document 2). Note that the technique of Patent Document 2 uses titanium oxide, which has the ability to block light, as the watermark ink, and suppresses deterioration of the watermark over time and forms a fine watermark.

As described above, a technology has been proposed in which patterns are formed using inks with penetrating components or light-shielding inks, and the images are invisible under reflected light and visible when observed under transmitted light. The applicant believes that, when observed under transmitted light, a printed pattern that produces a new effect when observed under reflected light is a printed pattern consisting of two regions that are the same color and cannot be visually recognized separately. A printed matter has been proposed in which, when observed under light, a difference in brightness occurs in two regions and a printed pattern can be visually recognized (see, for example, Patent Document 3).

In addition, the applicant of the present application proposes a printed matter with improved authenticity discrimination and anti-counterfeiting effect of valuable printed matter by improving the contrast of an image that can be seen when observed under transmitted light using the technique of Patent Document 3. (See Patent Document 4, for example). As an example of the printed image provided in the printed matter of Patent Document 4, the printed image consists of two regions in which image elements of different colors from the base material are arranged with different area ratios, and the area with the higher area ratio of the image elements By overlapping image elements formed by white ink containing a light-shielding material such as titanium oxide, the image elements are formed in the same color as the low area ratio area under reflected light. When viewed under transmitted light, the image element formed of the light-blocking material blocks light, causing a difference in brightness and a latent image to be visually recognized.

JP-A-6-228900 Japanese Patent No. 3444535 Japanese Patent No. 6014877 Japanese Patent Application Laid-Open No. 2019-142168

However, the printed matter of Patent Document 4 is uniform in color under reflected light and in which the image changes color under transmitted light and the image can be visually recognized. images were limited to single colors. Therefore, there is a problem that only a simple image can be represented as an image that can be visually recognized under transmitted light. Therefore, in order to improve the authenticity and designability when observing valuable printed matter under transmitted light, the color expression of images that can be seen under transmitted light is rich, and the images that can be expressed are limited to simple images. There has been a desire for a printed matter that does not cause any damage.

An object of the present invention is to solve the above-mentioned problems. To provide a transmission latent image print with rich color expression.

In the transmission latent image print of the present invention, a first image, a second image, . . . , an n-th image (n is a natural number equal to or greater than 2), the printed image includes a first area that constitutes the first image, a second area that constitutes the second image, . A plurality of n-th regions are regularly arranged, and the first region includes a first latent image portion in which a plurality of first image elements of a predetermined color are arranged, and a first latent image portion. It consists of a first background portion in which a plurality of first image elements are arranged with a lower area ratio, and at least a portion above the first image elements arranged in the first latent image portion has a light blocking property By overlapping the latent image elements made of white ink, the first latent image portion is formed in the same color as the first background portion under reflected light, and the second area is formed in a color different from that of the first image element. a second latent image portion in which a plurality of second image elements are arranged; and a second background portion in which a plurality of second image elements are arranged at an area ratio lower than that of the second latent image portion. A latent image element made of light-shielding white ink overlaps at least a portion of the second image element arranged in the latent image area, so that the second background area becomes the second latent image element under reflected light. The n-th area is formed in the same color as the image portion, and the n-th image element having a color different from the first image element, the second image element, and the n-1 image elements. and an n-th background portion in which a plurality of n-th image elements are arranged with an area ratio lower than that of the n-th latent image portion, and arranged in the n-th latent image portion A latent image element made of light-blocking white ink is superimposed on at least a part of the n-th image element, so that the n-th background portion has the same color as the n-th latent image portion under reflected light. 2, the patterns expressed by the first latent image portion to the nth latent image portion are partially different, and when observed under transmitted light, each latent image portion and each background portion are distinguished by the difference in the amount of transmitted light, In addition, a color image obtained by synthesizing the latent image portions is visually recognized.

Further, in the transmission latent image print of the present invention, the first latent image portion constituting the first area, the second latent image portion constituting the second area, . . . and the nth area. The area ratio of at least one of the n-th latent image portions is partially different.

Further, in the transmission latent image print of the present invention, the printed image comprises a first image, a second image and a third image, and each of the first image to the third image is printed with cyan ink and magenta ink. , is formed with yellow ink.

Further, the transmission latent image print of the present invention further comprises a reflection image, the printed image being of a color different from that of the base material and comprising a plurality of regions, wherein the plurality of regions constituting the reflection image are formed from the first region. The regions that are regularly arranged without overlapping with the n-th region and constitute the reflective image include a reflective image portion in which a plurality of reflective image elements having a color different from that of the substrate are arranged, and an area ratio lower than that of the reflective image portion. Composed of a camouflage portion in which a plurality of reflective image elements are arranged, camouflage is achieved under transmitted light by overlapping a camouflage element made of light blocking white ink on at least a part of the reflective image elements arranged in the camouflage portion. When observed under reflected light, the reflected image is visible due to the difference in shade between the reflected image portion and the camouflage portion, and when observed under transmitted light, the reflected image is visible under reflected light. The feature is that the image disappears.

In the transmission latent image print of the present invention, an image that can be visually recognized under transmitted light can be visually recognized with a plurality of colors, and is excellent in color expression. The image that can be seen when the printed matter of the prior art is observed under transmitted light is represented by the difference in shades of one color. Excellent in nature.

In addition, since the transmission latent image print of the present invention provides a rich color representation of the image visible under transmitted light, it is possible to solve the problem that the image visible under transmitted light is limited to simple images. can.

1 is a diagram showing the configuration of a transmission latent image print of the present invention; FIG. FIG. 2 is a diagram showing an image visually recognized when observing the transmission latent image print of the present invention; 4A and 4B are diagrams illustrating the configuration of a print image according to the first embodiment; FIG. FIG. 3 is a diagram showing the structure of a first image that forms a print image; FIG. 4 is a diagram showing the configuration of a first background portion that forms a first image; FIG. 4 is a diagram showing the configuration of a first latent image portion that forms a first image; FIG. 4 is a diagram showing an example of an arrangement in which a latent image element is superimposed on a first image element; FIG. 4 is a diagram showing a layered state of printed images; FIG. 10 is a diagram showing the structure of a second image forming a print image; FIG. 10 is a diagram showing the structure of a third image forming a print image; It is a figure which shows the example by which the 1st latent image part was comprised by the image line. It is a figure which shows the example by which the 1st background part was comprised by the streak. FIG. 10 is a diagram showing a configuration in which the area ratio of the first latent image portion is different in the first region; FIG. 3 is a diagram showing an example of areas that form a print image; FIG. 10 is a diagram showing another example of areas that form a print image; FIG. 10 is a diagram showing the configuration of a print image according to the second embodiment; FIG. FIG. 4 is a diagram showing the structure of a reflected image forming a printed image; FIG. 4 is a diagram showing the configuration of a reflected image portion forming a reflected image; FIG. 4 is a diagram showing the configuration of a camouflage portion that forms a reflected image; FIG. 10 illustrates an example arrangement of camouflage elements overlying reflective image elements; FIG. 10 is a diagram showing an image visually recognized when observing the transmission latent image print of the second embodiment; FIG. 10 is a diagram showing a configuration in which image elements of different colors are laminated in a first background portion; FIG. 4 is a diagram showing a configuration in which image elements of different colors are laminated in the first latent image portion;

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 within the scope of the technical ideas described in the claims.

FIG. 1 shows a transmission latent image print (1) according to the present invention. The transmission latent image print (1) of the present invention comprises a substrate (2) on which a printed image (3) having a color different from that of the substrate (2) is formed. is composed of image elements of the colors The printed image (3) shown in FIG. 1 shows an example in which a square pattern with a uniform density is formed under reflected light, but circular or polygonal patterns may also be used. Also, the color of the printed image (3) may be any color other than transparent as long as it has a color different from that of the substrate (2). When the transmission latent image print (1) of the present invention is observed under reflected light as shown in FIG. ), when observed under transmitted light, a printed image (3) of “running water and autumn leaves” having a plurality of colors is visually recognized. Hereinafter, the details of the transmission latent image print (1) of the present invention will be described.

(Base material)
The base material (2) constituting the transmission latent image print (1) in the present invention must have the property of transmitting light, that is, the so-called light transmittance, like woodfree paper, coated paper, film or plastic. However, opaque plastics and metals are not effective under transmitted light.

(printed image)
In the transmission latent image print (1) of the present invention, the printed image (3) has a configuration having image elements of a plurality of colors as described above. A printed image (3) having elements is formed and three colors are described using cyan, magenta and yellow used as process color inks. It should be noted that these inks are inks that do not contain a light blocking material apart from the color pigment.

(First embodiment)
FIG. 3(a) is a diagram showing the configuration of a printed image (3) formed of image elements of three colors, and FIGS. 3(b), 3(c), and 3(d) show FIG. 10 is a diagram showing an image composed of image elements of respective colors that constitute an image (3); FIG. 3(b) is a diagram showing an image composed of cyan (hereinafter referred to as "first image (3A)"), and FIG. 3(c) is an image composed of magenta. (hereinafter referred to as "second image (3B)"), and FIG. 3D illustrates an image composed of yellow (hereinafter referred to as "third image (3C)"). It is a diagram. These correspond to respective color plates obtained by color-separating the printed image (3) (in this case, into three colors of cyan, magenta, and yellow). The printed image (3) has different regions in which the first image (3A) to the third image (3C) are formed according to a plurality of colors, here, three colors, and is an enlarged view of FIG. The figure shows a first area (10A) where a first image (3A) is formed, a second area (10B) where a second image (3B) is formed and a third image (3C) where a third image (3C) is formed. A plurality of third regions (10C) are provided in parallel lines at a constant pitch (P).

In the transmission latent image print (1) of the present invention, the width of the first area (W1), the width of the second area (W2) and the width of the third area (W3) shown in the enlarged view of FIG. ) is not particularly limited, but considering the visibility (resolution) of the printed image (3), when visually observing the first region (10A) to the third region (10C), the regions are clearly visible. Instead, it is preferable to set the size so that each region can be perceived as a mixed color. Suppose that the form of the transmission latent image print (1) of the present invention is visually invisible at a general viewing distance (about 40 cm) for valuable printed matter such as banknotes and passports, and is visible as mixed colors. It is preferable that the size (W1, W2, W3) of each region (10A, 10B, 10C) for the purpose is 1 mm or less. Considering the visibility (resolution) of the printed image (3) in the case of valuable printed matter such as banknotes and passports, each region (10A, 10B, 10C) are arranged, in the case of FIG. 3, the width of the first area (W1), the width of the second area (W2) and the width of the third area (W3) The sum is preferably 3 mm or less.

In FIG. 3, the image forming areas (10A, 10B, 10C) are formed in the order of the cyan first image (3A), the magenta second image (3B), and the yellow third image (3C). ) are arranged, but it is not limited to this, and each region (10A, 10B, 10C) may be arranged at a constant cycle. Next, detailed configurations of the first image (3A) to the third image (3C) will be described.

(first image)
First, the first image (3A) formed in cyan, which is one of the three images forming the print image (3), will be described. FIG. 4(a) is a diagram showing the configuration of the first image (3A). From the first latent image portion (3A ₁ ) shown in FIG. 4(b) that constitutes the pattern of "and autumn leaves" and the first background portion (3A ₂ ) shown in FIG. 4(c) that constitutes the background thereof Become. The first image (3A) shown in FIG. 4(a) consists of a plurality of regularly arranged first regions (10A), as shown in the enlarged view of FIG. 4(a). (10A) is printed with cyan ink to form the first image element (11A), and the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) are printed with cyan ink. The area ratios of the first image elements (11A) formed by are different. Also, in the first latent image portion (3A ₁ ), a latent image element (12A) made of light blocking white ink, which will be described later, is superimposed on the first image element (11A). In the present invention, the term "area ratio" refers to the ratio of the area of elements arranged within a certain area of the substrate (2).

(First background part)
FIG. 5 is a diagram showing the configuration of the first background portion (3A ₂ ). As described above, the first background portion (3A ₂ ) is formed by arranging a plurality of first image elements (11A) formed by printing cyan ink. The example of FIG. 5 is an example in which the first image element (11A) is formed of circular pixels. In this case, as shown in the enlarged view of FIG. 5, the first image formed of circular pixels A plurality of elements (11A) are arranged at a first A pitch (P _1A ) in the first A direction (V _1A ) and at a first B pitch (P _1B ) in the first B direction (V _1B ). The first A direction (V _1A ) and the first B direction (V _1B ) in which the first image element (11A) is arranged are not limited to the directions shown in FIG. 5 as long as they are different directions. Absent.

FIG. 5 shows an example in which the first image element (11A) is composed of circular pixels. Alternatively, an image line and pixels may be combined. In the present invention, the term "pixel" refers to a printing halftone dot itself, which is the minimum 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. , polygons including quadrilaterals, various figures such as stars, letters, symbols, numbers, and the like. On the other hand, "image line" is an image element formed by continuously arranging printing halftone dots, which are the minimum units for forming a printed image, in a specific direction. and wavy lines. The same applies to the latent image element (12A) and the first image element (11A) arranged in the first latent image portion (3A ₁ ), 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 transmission latent image print (1) of the present invention, the first image element (11A) may be formed in a size that allows placement in the first area (10A). However, considering the visibility (resolution) of the printed image (3), it is preferable that the shape and color of the first image element (11A) itself be of a size that cannot be visually recognized. If the form of the transmission latent image print (1) of the present invention forms a high-definition print image (3) at a general viewing distance (about 40 cm) for precious prints such as banknotes and passports. In the case, the dimension (W _1A ) in the first A direction (V _1A ) and the dimension (W _1B ) in the first B direction (V _1B ) of the first image element (11A) are from 10 μm to It is preferably 500 μm. Further, in the form of the transmission latent image print (1) of the present invention, at a general observation distance (about 40 cm) in the case of valuable printed matter such as banknotes and passports, between the first image elements (11A) If is too large, the visibility of the printed image (3) is reduced, so the distance between the first image elements ( _11A ) is 500 μm or less. It is preferable to arrange the first image elements (11A) as the pitch ( _P1B ).

(First latent image portion)
FIG. 6 is a diagram showing the configuration of the first latent image portion (3A ₁ ), and FIGS. 6B and 6C show the first latent image portion (3A ₁ ) is a partially enlarged view. As described above, the first latent image portion (3A ₁ ) is formed by printing cyan ink on the first image element (11A) shown in FIG. The latent image element (12A) shown in FIG. 6(c) formed by printing the ink of . The example of FIG. 6 is an example in which the first image element (11A) is formed of circular pixels. In this case, as shown in the enlarged view of FIG. 6, the first image formed of circular pixels A plurality of elements (11A) are arranged in the second A direction (V _2A ) with the second A pitch (P _2A ) and in the second B direction (V _2B ) with the second B pitch (P _2B ). The second A direction (V _2A ) and the second B direction (V _2B ) in which the first image element (11A) is arranged are not limited to the directions shown in FIG. 6 as long as they are different directions. Absent. Further, the second A direction (V _2A ) and the second B direction (V _2B ) in which the first image element (11A) of the first latent image portion (3A ₁ ) is arranged are the same as the first background portion ( The first A direction (V _1A ) and the first B direction (V _1B ) in which the first image element (11A) of 3A ₂ ) is arranged may be the same direction or may be different directions.

The area ratio of the first image element (11A) arranged in the first latent image portion (3A ₁ ) is the area of the first image element (11A) arranged in the first background portion (3A ₂ ) The area ratio of the first image element (11A) arranged in the first latent image portion (3A ₁ ) is different from the area ratio of the first image element (11A) arranged in the first background portion (3A ₂ ). It is higher than the area ratio of (11A). The reason for this is that by laminating the latent image element (12A) made of white ink having a light-blocking property, which will be described later, the image density of the first latent image portion (3A ₁ ) is made lighter (brighter) under reflected light. ) to have the same color as the _first background portion (3A ₂ ). This is because it is necessary to design the area ratio higher than that of the background portion (3A ₂ ).

The area ratio of the first image element (11A) arranged in the first latent image portion (3A ₁ ) is defined as the area ratio of the first image element (11A) arranged in the first background portion (3A ₂ ). As a specific example for increasing the size, the circular pixel size of the first image element (11A) of the first latent image portion (3A ₁ ) is increased to that of the first background portion (3A ₂ ). A configuration in which the first image elements (11A) are larger than the first image elements (11A) and arranged in the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) at the same pitch. There is In this case, the size (W 2A , W 2B ) of the first image element (11A) of the first latent image portion (3A ₁ ) is changed to the size (W _2A , W _2B ) of the first image element (11A) of the first background portion (3A ₂ ). ) is larger than the size (W _1A , W _1B ), the area ratio of the first latent image portion (3A ₁ ) can be made larger than the area ratio of the first background portion (3A ₂ ).

As another example, the first image elements (11A) of the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) are circular pixels of the same size, and the first The pitch ( _P2A , P2B) at which the _first image elements (11A) of the latent image portion (3A1) are arranged is the pitch at which the first image elements (11A) of the _first background portion ( _3A2 ) are arranged. There is a configuration that makes it smaller than (P _1A , P _1B ). The first latent image portion (3A ₁ ) configured as described above has a higher area ratio than the first background portion (3A ₂ ), and is formed as an image darker than the first background portion (3A ₂ ). be done.

FIG. 6(c) is a diagram showing an example of the configuration of the latent image elements (12A) formed in the first latent image portion (3A ₁ ). The latent image element (12A) laminated on the first image element (11A) of the first latent image portion (3A ₁ ) is white and is formed with ink having light blocking properties. By arranging in the direction (V _2A , V _2B ) in which the first image element (11A) is arranged at the same pitch (P _2A , P _2B ) as the image element (11A), the first image element (11A ) are superimposed on each other.

If the size (W _3A ) in the second A direction (V _2A ) of the latent image element (12A) and the size (W _3B ) in the second B direction (V _2B ) of the latent image element (12A), then the latent image element (12A) ) may be the same size (W _2A , W _2B ) as the size (W _2A , W _2B ) of the first image element (11A), or may be different. is of a size that can be placed in the first area (10A). If the first image element (11A) and the latent image element (12A) are of different sizes, the latent image element (12A) may be larger or smaller than the first image element (11A). However, the size of the latent image element (12A) is adjusted so that the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ), which will be described later, are formed in the same color under reflected light. There is a need.

The ink that forms the latent image element (12A) uses an ink containing a metal pigment to have a light shielding property. In the first embodiment, the ink having a light blocking property that forms the latent image element (12A) is white, and an example of the white ink having a light blocking property is a metal pigment of titanium oxide. There is mixed ink.

In the first latent image portion (3A ₁ ), the overlapping arrangement of the first image element (11A) and the latent image element (12A) is the same size as the first image element (11A) and the latent image element (12A). ) may be completely coincident and overlapped, and in FIG. 7A, the first image element (11A) indicated by the horizontal line and the latent image element (12A) indicated by the vertical line are coincident and overlapped at the same position. state. Alternatively, as shown in FIG. 7B, the first image element (11A) and the latent image element (12A) of the same size may partially overlap each other. Also, the first image element (11A) and the latent image element (12A) of different sizes may be arranged. It is smaller and shows the state where the first image element (11A) is entirely covered with the latent image element (12A). Also, in FIG. 7(d), the latent image element (12A) is smaller than the first image element (11A), and the entire latent image element (12A) is partially above the first image element (11A). are arranged overlapping each other. Alternatively, as shown in FIG. 7(e), the first image element (11A) and the latent image element (12A) of different sizes may partially overlap each other. However, the first image element (11A) and the latent image element (12A) are formed so that the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ), which will be described later, are formed in the same color. It is necessary to adjust the overlapping arrangement.

(Description of color matching relationship)
Next, the configuration and reason why the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) of the present invention are formed in the same color under reflected light will be described. Using cyan ink, the area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) is 40%, and the area of the first image element (11A) of the first background portion (3A ₂ ) is 30%, the first latent image portion (3A ₁ ) has a higher area ratio than the first background portion (3A ₂ ), and thus is darker than the first background portion (3A ₂ ). Formed in a blue state. Subsequently, when a latent image element (12A) made of white and light blocking ink is laminated on the first image element (11A) of the first latent image portion (3A ₁ ), the reflected light Below, the first latent image portion (3A ₁ ) is visually recognized as a mixture of dark blue of the first image element (11A) and white of the latent image element (12A). In this way, the dark blue color and the white color are mixed to make the dark blue color lighter, thereby changing the color of the first latent image portion (3A ₁ ) to the color of the first background portion (3A ₂ ) under the reflected light. ) can be made equivalent to the blue of In the present invention, color matching refers to a state in which two colors are close enough to be perceived as the same color when an observer glances at the image without paying attention. Specifically, color matching in the present invention is defined up to a numerical value of 7 or less in color difference ΔE (according to the CIE 1976 L*a*b* color difference formula in the present invention).

The conditions for forming the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) formed with different area ratios in the same color under reflected light are the color of the ink used, the first The area ratio of the image element (11A) and the latent image element (12A), the ratio of the overlapping area of the first image element (11A) and the latent image element (12A), and the ink color mixture forming the latent image element (12A) Since it varies depending on the condition (ink density), it is sufficient to check the conditions for uniform colors in advance and apply them as the printing conditions for the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ). .

For example, the area ratio of the first image element (11A) of the first background portion (3A ₂ ) is 45%, and the area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) is 60%. , and when the latent image element (12A) of the first latent image portion (3A ₁ ) is formed in the state shown in FIG. 7A, the first latent image portion (3A ₁ ) and the first If the first image element (11A) partially overlaps the latent image element (12A) as shown in _FIG . Since the overlapping area of the image elements (12A) is reduced, the effect of lightening the first image element (11A) is reduced. In such a case, the area ratio of the first image element (11A) in the first background portion (3A ₂ ) is increased to more than 45% or the density of the latent image element (12A) is increased. By increasing the transfer amount of the white ink having a light-blocking property, it is possible to form a matching color relationship between the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ). Further, the area ratio of the first image element (11A) of the first background portion (3A ₂ ) is 45%, and the area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) is 60%. When the latent image element (12A) is formed in the state shown in FIG. 7A, the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) have the same color When the area ratio of the first image element (11A) in the first background portion (3A ₂ ) is increased under the following conditions, as shown in FIG. 7D, the first latent image portion (3A ₁ ) by reducing the size of the latent image element (12A) or reducing the density of the latent image element (12A), specifically, by reducing the transfer amount of the light-blocking white ink, By reducing the degree of fading of (11A), it is possible to form a matching color relationship between the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ). Further, the area ratio of the first image element (11A) of the first background portion (3A ₂ ) is 45%, and the area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) is 60%. , and when the latent image element (12A) of the first latent image portion (3A ₁ ) is formed in the state shown in FIG. 7A, the first latent image portion (3A ₁ ) and the first When the area ratio of the first image element (11A) of the first background portion (3A ₂ ) is reduced with respect to the condition that the background portion (3A 2 ) of the background portion (3A ₂ ) becomes the same color, as shown in FIG. , the area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) is reduced, or the density of the latent image element (12A) of the first latent image portion (3A ₁ ) is increased. More specifically, by increasing the transfer amount of white ink having a light-shielding property, a matching color relationship between the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) is configured. be able to.

Further, when the color of the base material (2) is the same as "white", which is the color of the light blocking ink, the latent image elements (12A) are arranged in the first latent image portion (3A ₁ ) without gaps. A so-called solid pattern configuration may also be used. This is because the light blocking ink is the same color as the substrate ( ₂ ), so the latent image elements ( 12A) only darkens the first latent image portion (3A ₁ ) under transmitted light without affecting the printed image (3) observed under reflected light.

(Cross-sectional structure)
FIG. 8 shows the layered state of the printed image (3) formed as described above. In the first background portion (3A ₂ ), the first image element (11A) is formed on the substrate (2), and in the first latent image portion (3A ₁ ), the first image element ( 11A) to form a latent image element (12A). In the present invention, as a method of forming each image element (11A, 12A), printing machines such as offset printing, flexo printing, screen printing, etc., laser printers, etc. can be used.

(second image)
Next, the configuration of the second image (3B) configured in magenta will be described with reference to FIG. The difference between the second image (3B) and the first image (3A) is the color of the ink forming the second image (3B) and the pattern represented by the second image (3B). Since the rest of the configuration is the same as the first image (3A), the description is partially omitted.

FIG. 9(a) is a diagram showing the configuration of the second image (3B), and the second image (3B) is a diagram of the pattern of "autumn leaves" in the second image (3B). It consists of a second latent image portion (3B ₁ ) shown in 9(b) and a second background portion (3B ₂ ) shown in FIG. 9(c) that constitutes the background thereof. It should be noted that the pattern of "autumn leaves" composed of magenta out of the three colors of cyan, magenta, and yellow obtained by color separation of the printed image (3) is different from the pattern of "running water and autumn leaves" composed of cyan. Therefore, the pattern of the second latent image portion (3B ₁ ) is different from that of the first latent image portion (3A ₁ ).

The second image (3B) consists of a plurality of regularly arranged second regions (10B), as shown in the enlarged view of FIG. 9(a). A second image element (11B) is formed by printing ink, and a second latent image portion (3B ₁ ) and a second background portion (3B ₂ ) are a second image formed by magenta ink. The area ratio of the element (11B) is different. Specifically, the area ratio of the second image element (11B) formed in the second latent image portion (3B ₁ ) is the same as that of the second image element (11B) formed in the second background portion (3B ₂ ). 11B). Also, a latent image element (12B) made of light blocking white ink is superimposed on the second image element (11B) of the second latent image portion (3B ₁ ).

The second image element (11B) and the latent image element (12B) formed in the second latent image portion (3B ₁ ) and the second background portion (3B ₂ ) are the first image element (11A) and Like the latent image element (12A), it has a configuration of "pixels" and "image lines", and the size and pitch ranges are the same as those of the first image element (11A).

Also in the second image (3B) having the above configuration, the relationship between the second latent image portion (3B ₁ ) formed with magenta ink and the second background portion (3B ₂ ) is the second image portion (3B 2 ) having a high area ratio. The latent image portion (3B ₁ ) of 2 is formed in dark red under reflected light, but is further overlapped with the white latent image element (12B) to make it paler, resulting in a second background portion under reflected light. (3B ₂ ) is formed isochromatically. Under transmitted light, the second latent image portion (3B ₁ ) is formed by the latent image element (12B) formed of light-blocking white ink, which blocks light, so that the second image element (11B ) is darkened, a difference in gradation from the second background portion (3B ₂ ) is produced, and the “autumn leaves” pattern expressed in red gradation can be visually recognized.

(Third image)
Next, the configuration of the third image (3C) composed of yellow will be described with reference to FIG. Note that the third image (3C) differs from the first image (3A) and the second image (3B) in that the color of the ink forming the third image (3C) and the It is a pattern represented by the image (3C), and since other configurations are the same as those of the first image (3A) and the second image (3B), the description is partially omitted.

FIG. 10(a) is a diagram showing the structure of the third image (3C), and the third image (3C) is a diagram of the pattern of "autumn leaves" in the third image (3C). It consists of a third latent image portion (3C ₁ ) shown in 10(b) and a third background portion (3C ₂ ) shown in FIG. 10(c) that constitutes the background thereof. Note that the pattern of "autumn leaves" composed of the yellow color of the three colors of cyan, magenta, and yellow obtained by color separation of the printed image (3) is the pattern of "running water and autumn leaves" composed of cyan and the magenta color. Since it is different from the pattern of "autumn leaves" composed of colors, the third latent image portion (3C ₁ ) has the patterns of the first latent image portion (3A ₁ ) and the second latent image portion (3B ₁ ). different from

The third image (3C) consists of a plurality of regularly arranged third regions (10C), as shown in the enlarged view of FIG. 10(a). A third image element (11C) is formed by printing ink, and a third latent image portion (3C ₁ ) and a third background portion (3C ₂ ) form a third image formed with yellow ink. The area ratio of the element (11C) is different. Specifically, the area ratio of the third image element (11C) formed in the third latent image portion (3C ₁ ) is the same as that of the third image element (11C) formed in the third background portion (3C ₂ ). 11C). Also, a latent image element (12C) made of light blocking white ink is superimposed on the third image element (11C) of the third latent image portion (3C ₁ ).

The third image element (11C) and the latent image element (12C) formed in the third latent image portion (3C ₁ ) and the third background portion (3C ₂ ) are the first image element (11A), Like the second image element (11B) and the latent image elements (12A, 12B), it is a configuration of "pixels" and "image lines", and the range of size and pitch is the same as that of the first image element (11A). is similar to

Also in the third image (3C) having the above configuration, the relationship between the third latent image portion (3C ₁ ) formed with yellow ink and the third background portion (3C ₂ ) has a high area ratio. The latent image portion (3C ₁ ) of 3 is formed in dark yellow under reflected light, but is further overlaid with the white latent image element (12C) to become paler, resulting in a third background portion under reflected light. (3C ₂ ) is formed isochromatically. In addition, the third latent image portion (3C ₁ ) under transmitted light is formed by the latent image element (12C) formed of light-blocking white ink, which blocks light, so that the third image element (11C ) is darkened, a difference in gradation from the third background portion (3C ₂ ) occurs, and the pattern of “autumn leaves” expressed in gradation of yellow can be visually recognized.

(Observation under reflected light)
When the transmission latent image print ( ₁ ) formed with the above configuration is observed under reflected light as shown in FIG. 3B ₁ , 3C ₁ ) and the background portion (3A ₂ , 3B ₂ , 3C ₂ ) are formed in the same color. The colors of the yellow and yellow inks are mixed to give an achromatic gray color, and the printed image (3) with a uniform density is visually recognized.

(Observation under transmitted light)
Further, as shown in FIG. 2(b), when the transmission latent image print (1) is placed between the observer (E2) and the light source (L2) and observed under transmitted light, _each latent image portion (3A1 , 3B ₁ , 3C ₁ ) and each background portion (3A ₂ , 3B ₂ , 3C ₂ ). At this time, the first latent image portion (3A ₁ ) of cyan, the second latent image portion (3B ₁ ) of magenta, and the third latent image portion (3C ₁ ) of yellow are combined to form a color image. You can see the pattern of "running water and autumn leaves".

In the transmission latent image print (1) of the present embodiment, the printed image (3) is composed of three colors of cyan, magenta, and yellow. ) is not limited to this, and may be composed of two colors, or may be composed of more colors. The colors are not limited to cyan, magenta, and yellow, and may be green, pink, orange, black, or the like. It is preferable to use a combination that becomes achromatic by color mixing, such as complementary colors and process colors. With such a combination, an achromatic printed image under reflected light becomes a chromatic printed image under transmitted light, so that the change is easily felt and the visibility of the latent image portion under transmitted light is improved. The configuration using cyan, magenta, and yellow process colors is preferable because the range of colors that can be expressed by synthesizing the respective colors is wide.

(Example where the image element is composed of streaks)
In the above description, the first image element (11A), the second image element (11B), the third image element (11C) and the latent image elements (12A, 12B, 12C) are composed of circular pixels. As an example, an example in which these elements are composed of streaks will be described next. Note that the first image (3A) will be described as an example.

FIG. 11 is a diagram showing an example in which the first image element (11A) of the first latent image portion (3A ₁ ) is composed of an image line. In this case, as shown in the enlarged view of FIG. 11, A plurality of first image elements (11A) having a line width (W _L 1) are arranged in a first A direction (V _1A ) at a first A pitch (P _1A ).

FIG. 12 is a diagram showing an example in which the first image element (11A) of the first background portion (3A ₂ ) is composed of streak lines. In this case, as shown in the enlarged view of FIG. A plurality of first image elements (11A) having a width (W _L 2) are arranged in a second A direction (V _2A ) at a second A pitch (P _2A ). The directions in which the first image elements (11A) of the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) are arranged may be the same direction or different directions. may

As in the case where each image element is composed of circular pixels, the area ratio of the first image element (11A) formed in the first latent image portion (3A ₁ ) is determined by the first background portion (3A ₂ ), the line width (W _L 1) of the first image element (11A) formed in the first latent image portion (3A ₁ ) is larger than the line width (W _L2 ) of the first image elements (11A) formed in the first background portion (3A ₂ ) and arranged at the same pitch, or the first latent image portion (3A ₁ ) and the first image element (11A) formed in the first background portion (3A ₂ ) have the same line width, and the pitch (P _1A ) of the first A is set to the first They are arranged to be smaller than the pitch of 2A (P _2A ).

When the latent image element ( _12A ) is composed of image lines, the configuration is the same as that of the first image element (11A) shown in FIG. , are arranged in the same 1st A direction (V _1A ) as the first image element (11A) at the 1st A pitch (P _1A ). Also, the latent image element (12A) is formed overlying the first image element (11A).

Even when the first image element (11A) and the latent image element (12A) are formed by image lines, considering the visibility (resolution) of the printed image (3), the first image element (11A) and the latent image element (11A) It is preferable that the shape and color of the element (12A) itself be of a size that cannot be visually recognized. If the transmission latent image print (1) of the present invention is in the form of a first image element (11A) and a latent The line widths (W _L 1, W _L 2, W _L 3) of the image elements (12A) should be about 10 μm to 500 μm. In addition, if the distance between the first image elements (11A) becomes too large, the visibility of the printed image (3) decreases. It is preferred to arrange the first image elements (11A) with a first A pitch (P _1A ) and a second A pitch (P _2A ) of As described in the case where each element is composed of pixels, the image lines are composed in order to make the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) have the same color. The area ratio of the first image element (11A) of the first latent image portion (3A ₁ ) and the first image element (11A) of the first background portion (3A ₂ ), the first latent image portion It is necessary to adjust the ratio of the overlapping area of the first image element (11A) and the latent image element (12A) of (3A ₁ ). The above is the description of the example in which the first image element (11A) and the latent image element (12A) are composed of image lines.

(Structure of Gradation Color Image)
In the transmission latent image print (1) of the present invention, not only can the color printed image (3) be visually recognized when observed under transmitted light, but also each color composing the printed image (3) can be expressed in gradation. , the configuration of which will be described below.

FIG. 13 is a diagram showing a configuration in which the area ratio of the first latent image portion (3A ₁ ) is different in the first region (10A). FIG. ₁ ), the area ratio gradually decreases from the left side to the right side. In this case, in the first latent image portion (3A ₁ ) shown in FIG. 13(a), the color visible under transmitted light becomes lighter from the left side to the right side, and the color of the ink forming the first area (10A) becomes lighter. Color gradation can be expressed. FIG. 13(a) shows the _first latent image portion (3A ₁ ), the area ratio may be varied stepwise as shown in FIG. 13(b). Also, the position of the first latent image portion (3A ₁ ) shown in FIG. 13(b) may be changed as shown in FIG. 13(c). Also, the first latent image portion (3A ₁ ) shown in FIG. 13(a) is divided into a plurality of first latent image portions (10A) in the first region (10A) as shown in FIG. A latent image portion (3A ₁ ) may be provided. FIG. 13(a) to FIG. 13(d) are diagrams showing the area of the _{first latent image portion (3A 1 )} . A plurality of image elements (11A) are arranged.

In FIG. 13, in the first area (10A), the ink forming the first area (10A) has a configuration in which the color becomes lighter from the left side to the right side. , the area ratio of the first latent image portion (3A ₁ ) in the first area (10A) may be varied. It should be noted that areas configured in a color different from that of the first area (10A), such as the second area (10B) and the third area (10C), can also be expressed in gradation in the same manner. .

Regarding the printed image (3) of the transmission latent image printed matter (1) of the first embodiment, as shown in FIG. However, the regions (10A, 10B, 10C) forming the print image (3) may be divided into parallel lines in the direction shown in FIG. 14(a). Moreover, as shown in FIG.14(b), the structure divided|segmented into parallel lines in the diagonal direction may be sufficient. Also, the regions (10A, 10B, 10C) divided into parallel lines are not limited to straight lines, and may be saw-shaped as shown in FIG. 14(c) or wavy lines as shown in FIG. 14(d). 14(c) and 14(d) show examples of the regions (10A, 10B, 10C) forming the print image (3), and the pattern of "running water and autumn leaves" is for convenience of explanation. , are omitted.

Also, as shown in FIG. 15, the area forming the print image (3) may be divided into a grid pattern. FIG. , 10C) are squares, and the square regions (10A, 10B, 10C) are arranged at regular intervals. When arranging the regions forming the print image (3) in a lattice pattern, the arrangement is not limited to that shown in FIG. , may be circular as shown in FIG.

(Second embodiment)
The transmission latent image print (1) of the second embodiment is a transmission latent image print (1) in which different images can be visually recognized when the printed image (3) is observed under reflected light and under transmitted light. The configuration of the image visible under transmitted light is the same as the configuration of the printed image (3) described in the first embodiment, so a part of the description is omitted.

FIG. 16 is a diagram showing the configuration of a printed image (3) according to the second embodiment. The printed image (3) according to the second embodiment is visually recognized under transmitted light shown in FIG. 16(b). An image with a “running water and autumn leaves” pattern (hereinafter referred to as a “transparent image (3-1)”) that can be displayed, and an image with a “butterfly” pattern that can be seen under reflected light shown in FIG. (referred to as "reflection image (3-2)"). In this embodiment, the reflected image (3-2) is an example of an image having a "butterfly" pattern. , symbols, etc. are not particularly limited. In the second embodiment, the transmitted image (3-1) has the same configuration as the printed image (3) described in the first embodiment, and when observed under transmitted light, the transmitted image ( 3-1) can visually recognize the pattern of "running water and autumn leaves" expressed in color.

FIG. 16(c) is a diagram showing the configuration of the reflected image (3-2). In the second embodiment, the reflected image (3-2) is made of ink of a different color from that of the substrate (2). Although it is formed, here, an example of forming using black ink will be described. In the reflected image (3-2) shown in FIG. 16(c), the areas (20) forming the reflected image (3-2) formed with black ink are arranged in parallel at a constant pitch (P). It shows an example of provision, and as shown in the enlarged view of FIG. placed.

In the second embodiment, the width (X1) of the area (20) forming the reflected image (3-2) is not particularly limited, but considering the visibility (resolution) of the printed image (3), It is preferable that the size of the region (20) is such that it cannot be detected when the region (20) is visually observed. If the form of the transmission latent image print (1) of the present invention is not visually captured at a general observation distance (about 40 cm) in the case of precious prints such as banknotes and passports, the area (20) The size (X1) of is preferably 1 mm or less. Considering the visibility (resolution) of the printed image (3) in the case of valuable printed matter such as banknotes and passports, each region (10A, 10B, 10C, 20) are arranged, in the case of FIG. 16, the width of the first region (W1), the width of the second region (W2), the width of the third region (W3 ) and the area (20) constituting the reflected image (3-2) is preferably 3 mm or less.

FIG. 17(a) is a diagram showing the configuration of the reflection image (3-2), and the reflection image (3-2) is a diagram that forms the pattern of "butterfly" in the reflection image (3-2). It consists of a reflected image portion (3-2a ₁ ) shown in 17(b) and a camouflage portion (3-2a ₂ ) shown in FIG. 17(c) that camouflages the reflected image portion (3-2a ₁ ) under transmitted light. . The reflected image (3-2) shown in FIG. 17(a) is composed of a plurality of regularly arranged regions (20) as shown in the enlarged view of FIG. 17(a). _A reflective image element (21A) is formed by printing black ink in the area ( ₂₀ ) constituting the The formed reflective image elements (21A) have different area ratios. Also, the camouflage portion (3-2a ₂ ) is a camouflage element (22A) made of light blocking white ink overlaid on the reflective image element (21A).

(reflection image area)
FIG. 18 is a diagram showing the configuration of the reflection image section (3-2a ₁ ). The example of FIG. 18 is an example in which the reflection image elements (21A) are made up of circular pixels. In this case, as shown in the enlarged view of FIG. are arranged at the 1a-th pitch (P _1a ) in the 1a-th direction (V _1a ) and at the 1b-th pitch (P _1b ) in the 1b-th direction (V _1b ). The 1a direction (V _1a ) and the 1b direction (V _1b ) in which the reflection image element (21A) is arranged are not limited to the directions shown in FIG. 18 as long as they are different directions. The reflective image element (21A) may be formed in a size that allows it to be placed in the area (20). Considering the resolution), it is preferable that the shape and color of the reflective image element (21A) itself be of a size that cannot be visually recognized. If the form of the transmission latent image print (1) of the present invention is the typical viewing distance (approximately 40 cm) for valuable prints such as banknotes and passports, the 1a of the reflective image element (21A) The size (W a 1) in the direction (V _1a ) and the size (W _b 1) in the 1b direction (V _{1b )} are preferably 10 μm to 500 μm. Further, in the form of the transmission latent image print (1) of the present invention, the distance between the reflective image elements (21A) is large at a general viewing distance (about 40 cm) for precious prints such as banknotes and passports. If it becomes too large, the visibility of the printed image (3) is reduced, so the distance between the reflective image elements ( _21A ) is 500 _μm or less. ) to position the reflective image element (21A).

(Camouflage part)
FIG. 19 is a diagram showing the configuration of the camouflage part ₍ 3-2a ₂ ), and FIGS. It is a part enlarged view. The camouflage part (3-2a ₂ ) is printed with light blocking white ink on the reflective image element (21A) shown in FIG. 19(b) formed by printing black ink, as described above. The camouflage element (22A) shown in FIG. 19(c) is formed by overlapping. The examples of FIGS. 19(b) and 19(c) are also examples in which the reflective image element (21A) and the camouflage element (22A) are made up of circular pixels. As shown in FIG. 19(c), the reflective image elements (21A) and the camouflage elements (22A) composed of circular pixels are arranged in the 2a direction ( _V2a ) with the 2a pitch (P2a) and the _2a A plurality of them are arranged at the 2b pitch (P _2b ) in the 2b direction (V _2b ). The 2a direction (V _2a ) and the 2b direction (V _2b ) in which the reflection image element (21A) is arranged are not limited to the directions shown in FIG. 19 as long as they are different directions.

As described above, the area ratio of the reflective image elements (21A) arranged in the camouflage portion (3-2a ₂ ) is the same as the area ratio of the reflective image elements (21A) arranged in the reflective image portion (3-2a ₁ ). , the area ratio of the reflective image element (21A) arranged in the camouflage portion (3-2a ₂ ) is higher than the area ratio of the reflective image element (21A) arranged in the reflective image portion (3-2a ₁ ). low. The reason for this is that the image density of the camouflage part (3-2a ₂ ) is deepened (darkened) under transmitted light by laminating the camouflage element (22A) made of white ink having a light blocking property, which will be described later. , the reflective image portion (3-2a ₁ ) and the reflective image portion (3-2a ₁ ) to eliminate the “butterfly” design. This is because the area ratio of the reflective image portion (3-2a ₁ ) must be designed to be lower than that of the reflective image element (21A) in advance.

As a specific example for making the area ratio of the camouflage portion (3-2a ₂ ) smaller than the area ratio of the reflective image portion (3-2a ₁ ), the reflective image element (21A) of the camouflage portion (3-2a ₂ ) ) is made smaller than the reflection image elements (21A) of the reflection image portion (3-2a ₁ ) and arranged at the same pitch. In this case, the size (W _a 2, W _b 2) of the reflected image element (21A) of the camouflage portion (3-2a ₂ ) is changed to the size of the reflected image element (21A) of the reflected image portion (3-2a ₁ ). By making it smaller than (W _a 1, W _b 1), the area ratio of the camouflage portion (3-2a ₂ ) can be made smaller than the area ratio of the reflective image portion (3-2a ₁ ). As another example, the reflection image elements (21A) of the reflection image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) are circular pixels of the same size, and the camouflage portion (3-2a ₂ ) is _{set larger than the pitch (P 1a , P 1b ) for} arranging the reflective image elements (21A) of the reflective image portion (3-2a ₁ ). There is configuration. Since the camouflage portion (3-2a ₂ ) having the above configuration has a smaller area ratio than the reflected image portion (3-2a ₁ ), it is formed as an image lighter in color than the reflected image portion (3-2a ₁ ). .

Assuming that the size (W a 3) of the camouflage element (22A) in the 2a direction (V _2a ) and the size (W _b 3) in the 2b direction (V _{2b )} , the camouflage element (22A) is The dimensions (W _a 3, W _b 3) may be the same as the dimensions (W _a 2, W _b 2) of the reflective image element (21A), or they may be different. , if the reflective image element (21A) and the camouflage element (22A) are of different sizes, the camouflage element (22A) may be larger or smaller than the reflective image element (21A), but the reflective image element (21A) may be smaller than the reflective image element (21A). It is necessary to adjust the size of the camouflage element (22A) so that the part (3-2a ₁ ) and the camouflage part (3-2a ₂ ) are formed in the same color under transmitted light.

(Action and effect under reflected light and under transmitted light)
Next, the effects of the reflected image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) configured as described above under reflected light and transmitted light will be described. Assuming that the reflective image portion (3-2a ₁ ) formed with black ink is formed with an area ratio of 40% and the camouflage portion (3-2a ₂ ) is formed with an area ratio of 30%, the camouflage portion (3-2a ₂ ) has a reflective Since it has a lower area ratio than the image portion (3-2a ₁ ), it is formed in a lighter gray state than the reflected image portion (3-2a ₁ ). Subsequently, when a camouflage element (22A) made of white ink with light blocking properties is laminated on the reflective image element (21A), the camouflage part (3-2a ₂ ) under reflected light becomes a reflective image As a color obtained by mixing the light gray of the element (21A) and the white of the camouflage element (22A), it is visually recognized as a lighter gray, and the difference in gradation (contrast) with the reflected image portion (3-2a ₁ ) under reflected light is growing. In addition, under transmitted light, the camouflage part (3-2a ₂ ) becomes a light gray camouflage part (3-2a ₂ ) by blocking the light with the camouflage element (22A) formed with light blocking ink. As a result of the darkening effect, the color becomes the same color as the reflected image portion (3-2a ₁ ), and the “butterfly” pattern disappears.

In the present invention, the conditions for forming the reflective image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) in which the reflective image elements (21A) are formed with different area ratios are the same color under transmitted light. , the color of the ink used, the area ratio of the reflection image element (21A) of the reflection image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ), the overlap of the reflection image element (21A) and the camouflage element (22A). Since it varies depending on the ratio of the area and the degree of color mixing of the inks forming the camouflage element (22A), conditions for color matching are confirmed in advance, and the reflected image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) ) can be applied as the printing conditions.

For example, the reflection image element (21A) of the reflection image portion (3-2a ₁ ) is formed with an area ratio of 45%, and the reflection image element (21A) of the camouflage portion (3-2a ₂ ) is formed with an area ratio of 35%. When ( _22A ) is formed in the state shown in _FIG . If the area ratio of the reflective image portion (3-2a ₁ ) is reduced, the camouflage portion (3-2a ₂ ) must be made darker (darkened) to a lesser extent in order to achieve uniform colors under transmitted light. In this case, as shown in FIG. 20(b), by decreasing the area ratio of the camouflage element (22A) and decreasing the degree of darkening of the camouflage part (3-2a ₂ ), the reflected image part ( 3-2a ₁ ) and the camouflage part (3-2a ₂ ) under transmitted light. Also, in the arrangement of the reflective image element (21A) and the camouflage element (22A) shown in _FIG . By lowering the degree of darkening (darkening), it is possible to construct a matching color relationship between the reflected image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) under transmitted light.

On the other hand, the reflective image element (21A) of the reflective image portion (3-2a ₁ ) is formed with an area ratio of 45%, and the reflective image element (21A) of the camouflage portion (3-2a ₂ ) is formed with an area ratio of 35%. When ( _22A ) is formed in the state shown in _FIG . If the area ratio of the reflected image portion (3-2a ₁ ) is increased, it is necessary to increase the degree of darkening (darkening) of the camouflage portion (3-2a ₂ ) in order to achieve uniform colors under transmitted light. In this case, in the arrangement of the reflective image element (21A) and the camouflage element (22A) shown in _FIG . By increasing the degree of darkening (darkening), it is possible to establish a matching color relationship between the reflected image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ) under transmitted light. Also, the area ratio of the reflective image element (21A) of the camouflage portion (3-2a ₂ ) may be increased, and at the same time the area ratio of the camouflage element (22A) may be increased.

In addition, when the color of the base material (2) is the same as "white" which is the color of the light blocking ink forming the camouflage element (22A), the camouflage element (22A) is added to the camouflage part (3-2a ₂ ). A so-called solid pattern configuration may be employed in which they are arranged without gaps. This is because the light-blocking ink is the same color as the substrate (2), so the camouflage element (22A) can be used under transmitted light without affecting the color of the "butterfly" pattern that is visible under reflected light. This is because only the effect of darkening the camouflage portion (3-2a ₂ ) is produced. Further, even when the color of the base material (2) is colored unlike white, when the color difference ΔE between the color of the base material (2) and the color of the part printed with white on the base material (2) is 7 or less. , the color of the base material (2) has little effect on the color of the printed image (3) under reflected light. The part (3-2a ₁ ) and the camouflage part (3-2a ₂ ) can be formed in the same color. When the color of the base material (2) has little effect on the color of the printed image (3), as shown in FIG. It may be an overall overlapping arrangement or, as shown in Figure 20(d), a partial overlapping arrangement of the reflective image element (21A) and the camouflage element (22A).

Observing the reflected image (3-2) having the above structure under reflected light reveals that due to the area ratio difference between the reflected image element (21A) of the reflected image portion (3-2a ₁ ) and the camouflage portion (3-2a ₂ ), By forming a camouflage element (22A) made of light-blocking white ink in addition to the shading, the “butterfly” design in which the shading of the black ink shown in FIG. 21(a) is emphasized is visually recognized. be able to. At this time, in the transmission image (3-1), as described above, each latent image portion (3A ₁ , 3B ₁ , 3C ₁ ) and each background portion (3A ₂ , 3B ₂ , 3C ₂ ) are Because they are formed in the same color, the pattern of "running water and autumn leaves" cannot be visually recognized. Since the transmission image (3-1) is formed with cyan ink, magenta ink, and yellow ink, it is visually recognized as mixed achromatic gray or black, and the black of the reflection image (3-2) is You can see the "butterfly" pattern represented by the difference in shades of ink.

In addition, the camouflage part (3-2a ₂ ) of the reflected image (3-2) under transmitted light has a thickening (darkening) effect by blocking the light with the camouflage element (22A). , the color becomes the same color as the reflected image portion (3-2a ₁ ) that is visually recognized as dark at , and the “butterfly” design disappears. On the other hand, in the transparent image (3-1), as described above, the latent image portions (3A ₁ , 3B ₁ , 3C ₁ ) and the background portions (3A ₂ , 3B ₂ , 3C ₂ ) have gradation differences. 21(b), the pattern of "running water and autumn leaves" can be visually recognized.

Regarding the transmission latent image print (1) of the second embodiment, the reflection image element (21A) and the camouflage element (22A) constituting the reflection image (3-2) are described as an example composed of circular pixels. However, like the image elements forming the transmissive image (3-1) described in the first embodiment, pixels of other shapes may be used, or they may be composed of lines. Further, in the same manner as the configuration for expressing gradation of _an image visually recognized under transmitted light shown in FIG. By varying the area ratio, it is possible to express the gradation of the "butterfly" pattern that is visually recognized under reflected light.

In the first and second embodiments, each image element (11A, 11B, 11C, 21A) is formed using a single ink. Elements may be formed by stacking. As a specific example, in contrast to the configuration in which the first image element (11A) formed with cyan ink in the first embodiment forms the blue first image (3A), the first image (3A) is A case of a purple image will be described.

FIG. 22(a) is a diagram showing the configuration of the first background portion (3A 2 ) of the first image (3A), and the first background portion (3A ₂ ) formed by printing the cyan ink shown in FIG. 22(b). A plurality of image elements (11A') of 1a are arranged. The color (cyan ink) of the 1a-th image element (11A') corresponds to one of blue and red obtained by color-separating purple. The example of FIG. 22B is an example in which the 1a-th image element (11A′) is composed of circular pixels, and the 1a-th image element (11A′) composed of circular pixels is the 1A-th image element (11A′). are arranged at the first A pitch (P _1A ) in the direction (V _1A ) and at the first B pitch (P _1B ) in the first B direction (V _1B ). If the 1A direction (V _1A ) and the 1B direction (V _1B ) in which the 1a image element (11A′) is arranged are different directions, they are limited to the directions shown in FIG. not to be

FIG. 22(c) is a diagram showing an example of the configuration of the 1b image element (11A'') formed by printing the magenta ink arranged in the _first background portion (3A2). The color (magenta ink) of the 1b-th image element (11A'') corresponds to the other of blue and red color-separated purple. The _1b -th image element (11A'') is the same pitch ( _P1A , P1B) as the 1a-th image element (11A') arranged in the _first background portion (3A2). 11A′) is arranged in the direction (V _1A , V _1B ) in which the first image element (11A′) is formed to overlap. In this way, by overlapping the 1b image element (11A'') with magenta ink on the 1a image element (11A') with cyan ink, colors are mixed and viewed as purple.

FIG. 23(a) is a diagram showing the configuration of the first latent image portion (3A ₁ ) of the first image (3A), and the first latent image portion (3A ₁ ) is shown in FIG. 23(b). , a plurality of 1a-th image elements (11A') formed by printing cyan ink are arranged. The example of FIG. 23B is an example in which the 1a-th image element (11A') is configured by circular pixels, and the 1a-th image element (11A') configured by circular pixels is the 2A-th image element (11A'). are arranged at the second A pitch (P _2A ) in the direction (V _2A ) and at the second B pitch (P _2B ) in the second B direction (V _2B ). Note that if the 2A direction (V _2A ) and the 2B direction (V _2B ) in which the 1a image element (11A′) is arranged are different directions, they are limited to the directions shown in FIG. not to be Further, the 2A direction (V _2A ) and the 2B direction (V _2B ) in which the 1a-th image element (11A′) of the first latent image portion (3A ₁ ) is arranged are the same as those of the first background portion. In the same direction as the 1st A direction (V _1A ) and the 1st B direction (V _1B ) in which the (3A ₂ ) 1ath image element (11A′) and the 1bth image element (11A″) are arranged There may be one, or it may be in a different direction.

FIG. 23(c) is a diagram showing an example of the configuration of the 1b image element (11A'') formed by printing the magenta ink arranged in the _first latent image portion (3A1). . The 1b-th image element (11A'') is the same pitch ( _P2A , _P2B ) as the 1a-th image element (11A') arranged in the _first latent image portion (3A1). By arranging in the direction (V _2A , V _2B ) in which (11A') is arranged, it is formed to overlap the 1a-th image element (11A').

In this way, by overlapping the 1b image element (11A'') with magenta ink on the 1a image element (11A') with cyan ink, colors are mixed and viewed as purple. Note that the 1a-th image element (11A') arranged in the first latent image portion (3A ₁ ) is arranged in the first background portion (3A ₂ ) as in the first embodiment. The 1b-th image element (11A''), which is higher than the area ratio of the 1a-th image element (11A') and is arranged in the _first latent image portion (3A1), is also the _first background portion (3A2 ) is higher than the area ratio of the 1b-th image element (11A″) arranged in . With this configuration, the first latent image portion (3A ₁ ) is formed as a darker purple image than the first background portion (3A ₂ ).

In the first latent image portion (3A ₁ ), the cyan ink 1a image element (11A′) is overlaid with the magenta ink 1b image element (11A″), and further thereon , a latent image element (12A) formed by printing light blocking white ink. FIG. 23(d) is a diagram showing an example of the configuration of the latent image elements (12A) arranged in the first background portion (3A ₂ ). The latent image elements (12A) are white and formed of light-blocking ink, and are arranged in plurality at a predetermined pitch. More specifically, the latent image elements (12A) are arranged at the same pitch (P _2A , P _2B ) as the 1a-th image elements (11A′) arranged in the first latent image portion (3A ₁ ). By arranging in the direction (V _2A , V _2B ) in which the image element (11A') is arranged, it is formed to overlap the 1a-th image element (11A').

If the size (W A 3) in the second A direction (V _2A ) of the latent image element (12A) and the size (W _B 3) in the second _B direction (V _2B ) of the latent image element (12A) are The size (W _A 3, W _B 3) of (12A) is the size (W _A 2', W _B 2') of the 1ath image element (11A'), as described in the above embodiment. The size may be the same as or different from the size of the first area (10A). When the 1a-th image element (11A') and the latent image element (12A) are of different sizes, the latent image element (12A) may be larger or smaller than the 1a-th image element (11A'). However, as described above, the size of the latent image element (12A) is such that the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) are formed in the same color under transmitted light. need to be adjusted.

As described above, the configurations of the 1a-th image element (11A′) and the 1b-th image element (11A″) other than the configurations of the 1a-th image element (11A′) and the 1b-th image element (11A″) have been described. The relationship of the area ratio, the adjustment of the color matching relationship, etc. are as described in the above embodiment. If the first latent image portion (3A ₁ ) and the first background portion (3A ₂ ) have a matching color relationship under transmitted light, the first image element (11A′) and the first b image element (11A'') does not have to overlap completely, and may be partially overlapped. A different configuration may be used.

Similarly, when the reflected image (3-2) in the second embodiment is a purple image, an image element (not shown) formed with cyan ink and an image formed with magenta ink are used. Elements (not shown) may be stacked to form a purple image. Here, an example in which the first image (3A) and the reflected image (3-2) are formed by mixing colors of two image elements has been described, but the second image (3B) and the third image (3C) are also Also, a configuration in which image elements of different colors are laminated may be employed.

Hereinafter, specific examples of transmission latent image prints (1) produced according to the above-described mode for carrying out the invention will be described in detail, but the present invention is not limited to these examples.

(Example 1)
Example 1 is a transmission latent image print (1) having the configuration of the first embodiment. Specifically, a transmission latent image print (1) having the configuration shown in FIGS. 1 to 7 was produced. White high-quality paper for color copying (basis weight: 79 g/m ² , whiteness: 90%, paper thickness: 95 μm) is used for the base material (2), and the printed image (3) is printed using graphic software for PC. Then, image data described below was created, and a color material was applied using a racer printer.

The width (W1) of the first region (10A), the width (W2) of the second region (10B), and the width (W3) of the third region (10C) shown in FIG. The pitch (P) for arranging the regions was set to 1500 μm.

The first image elements (11A) of the first background portion (3A ₂ ) were circular pixels as shown in FIG. 5, having an area ratio of 19%, and were formed using cyan ink. The design value of the size (W _1A , W _1B ) of the first image element is 65 μm, and the design value of the pitch (P _1A , P _1B ) of the first image element is 125 μm. The first image element (11A) of the first latent image portion (3A ₁ ) was formed by circular pixels as shown in FIG. 6 with an area ratio of 40% and using cyan ink. The design value of the size (W _2A , W _2B ) of the first image element is 90 μm, and the design value of the pitch (P _1A , P _1B ) of the first image element is 125 μm. Further, the latent image element (12A) of the first latent image portion (3A ₁ ) has a solid pattern configuration (100% image area ratio) covering the entire first latent image portion (3A ₁ ), and is oxidized. It was formed using white ink containing titanium. The color difference ΔE between the color tone of the base material (2) and the color tone of the part where the white solid was printed on the base material (2) was 1.69 (measured by a spectrophotometer).

The second image element (11B) of the second background portion (3B ₂ ) was a circular pixel with an area ratio of 19% and was formed using magenta ink. The design value of the size of the second image elements is 65 μm, and the design value of the pitch of the second image elements is 125 μm. The second image element (11B) of the second latent image portion (3B ₁ ) is a circular pixel, has an area ratio of 30%, and is formed using magenta ink. The design value of the size of the second image elements is 75 μm, and the design value of the pitch of the second image elements is 125 μm. The latent image element (12B) of the second latent image portion (3B ₁ ) has a solid pattern configuration (image area ratio of 100%) covering the entire second latent image portion (3B ₁ ), and is made of titanium oxide. It was formed using a white ink containing

The third image element (11C) of the third background portion (3C ₂ ) was formed with a circular pixel with an area ratio of 30% using yellow ink. The design value of the size of the third image element is 75 μm, and the design value of the pitch of the third image element is 125 μm. The third image element (11C) of the third latent image portion (3C ₁ ) was a circular pixel with an area ratio of 50%, and was formed using yellow ink. The design value of the size of the third image element is 105 μm, and the design value of the pitch of the third image element is 125 μm. The latent image element (12C) of the third latent image portion (3C ₁ ) has a solid pattern configuration (image area ratio of 100%) covering all of the third latent image portion (3C ₁ ), and is made of titanium oxide. It was formed using a white ink containing

When the transmission latent image print ( ₁ ) produced as described above is observed under the reflected light shown in FIG. The first background portion (3A ₂ ) was uniform in color, and the pattern of “running water and autumn leaves” could not be visually recognized. Similarly, a second latent image portion (3B ₁ ) and a second background portion (3B ₂ ) forming a second image (3B) and a third latent image portion forming a third image (3C) (3C ₁ ) and the third background portion (3C ₂ ) were also the same color, and the pattern of "running water and autumn leaves" could not be visually recognized under the reflected light. _On the _other hand, when the transmission latent image print _{( 1} ) is observed under the transmitted light shown in _FIG . 3B ₂ ), and the respective latent image portions (3A ₁ , 3B ₁ , 3C ₁ ) were combined to visually recognize the pattern of “running water and autumn leaves”.

1 Transmissive latent image print 2 Base material 3 Printed image 3A First image 3A ₁ First latent image portion 3A ₂ First background portion 3B Second image 3B ₁ Second latent image portion 3B ₂ Second background Section 3C Third image 3C ₁ Third latent image section 3C ₂ Third background section 3-1 Transmission image 3-2 Reflection image 3-2a ₁ Reflection image section 3-2a ₂ Camouflage section 10A First area 10B Second area 10C Third area 11A First image element 11A' First image element 11A'' Second image element 11B Second image element 11C Third image elements 12A, 12B, 12C Latent image elements 20 Reflected Image Constituting Area 21A Reflected Image Element 22A Camouflage Element E1 Reflected Observer E2 Transmissive Observer L1 Reflected Light Source L2 Transmitted Light Source

Claims (4)

A first image, a second image, . a printed image, wherein the printed image includes a first area forming the first image, a second area forming the second image, ..., an n-th forming the n-th image; are arranged regularly, and the first area includes a first latent image portion in which a plurality of first image elements of a predetermined color are arranged, and a lower than the first latent image portion A first background portion in which a plurality of the first image elements are arranged at an area ratio, and at least a portion of the first image elements arranged in the first latent image portion has a light shielding property. By overlapping the latent image elements made of white ink, the first latent image portion is formed to have the same color as the first background portion under reflected light, and the second area is the same color as the first image. A second latent image portion in which a plurality of second image elements having a color different from that of the elements are arranged, and a second background in which a plurality of the second image elements are arranged with an area ratio lower than that of the second latent image portion. A latent image element made of light-blocking white ink overlaps at least a part of the second image element arranged in the second latent image area, so that the latent image element is formed under reflected light. The second background portion is formed in the same color as the second latent image portion, . An n-th latent image portion in which a plurality of n-th image elements having a color different from that of the -1 image element are arranged, and a plurality of the n-th image elements are arranged in a lower area ratio than the n-th latent image portion. Reflected by overlapping a latent image element made of light-blocking white ink on at least a portion of the n-th image element arranged in the n-th latent image portion, which consists of the n-th background portion Under light, the n-th background portion is formed to have the same color as the n-th latent image portion, and part of the pattern that the n-th latent image portion appears from the first latent image portion is different, and transmitted light A transmission latent image characterized in that when viewed from below, each of the latent image portions and each of the background portions are separated by a difference in the amount of transmitted light, and a color image obtained by synthesizing the respective latent image portions is visually recognized. printed matter. The first latent image portion forming the first area, the second latent image portion forming the second area, . . . and the nth latent image forming the nth area. 2. The transmission latent image print according to claim 1, wherein at least one of the portions has a partially different area ratio. The printed image comprises the first image, the second image and the third image, and each of the first image to the third image is formed with cyan ink, magenta ink and yellow ink. 3. The transmission latent image print according to claim 1 or 2, characterized in that The printed image further comprises a reflected image having a color different from that of the base material and comprising a plurality of regions, wherein the plurality of regions constituting the reflected image overlap the first region to the n-th region. The regions forming the reflected image are composed of a reflected image portion in which a plurality of reflected image elements having a color different from that of the base material are arranged, and the reflected image with a lower area ratio than the reflected image portion. A camouflage element comprising a plurality of elements arranged in a camouflage section, and a camouflage element made of light-blocking white ink overlaps at least a portion of the reflective image element arranged in the camouflage section, so that the camouflage element can be seen under transmitted light. The camouflage portion is formed in the same color as the reflected image portion, and when observed under reflected light, the reflected image due to the difference in shade between the reflected image portion and the camouflage portion is visually recognized, and when observed under transmitted light, the reflected light is visible. 4. A latent transmission image print according to any one of claims 1 to 3, characterized in that the reflected image viewed underneath disappears.

Images