Special latent image pattern former

Abstract

To provide a special latent image pattern formed body which can achieve a full-range gradation that is in a state where all the gradations of 256 gradations of "0 to 255" can be expressed, and can obtain a high contrast.SOLUTION: A special latent image pattern formed body has a plurality of first streaks regularly arranged in a predetermined direction, in which the first streaks are formed at a first streak height with partially different streak heights, and allows a latent image to be visible due to a difference between brightnesses according to the first streak height by changing an observation angle to the surface of a base material, has a plurality of second streaks regularly arranged in a predetermined direction, in which the second streaks are formed adjacent to at least one of the first streaks, the second streaks are formed at a second streak height with partially different streaks, wherein the color of the first streaks is defined as a first color, the color of the second streaks is defined as a second color, and the first color is a color having lower brightness than that of the second color.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a special latent image pattern forming body that can be applied to valuable printed matter such as banknotes, passports, and securities to prevent counterfeiting and duplication. [Background technology]

[0002] There is a technology in which a latent image appears when a printed matter is tilted, based on the principle of moiré appearance that utilizes the three-dimensional shape of the surface of the printed matter (for example, Patent Document 1).

[0003] FIG. 7 is a schematic diagram showing a latent image 3' according to the prior art disclosed in Patent Document 1.

[0004] As shown in FIG. 7, the image data has a plurality of image lines (black lines) 101 regularly arranged in a predetermined direction, and some of the image lines 101 have different image line heights.

[0005] FIG. 8 is an explanatory diagram showing different observation angles of the latent image 3' shown in FIG. 7, with FIG. 8(a) being a diagram observed from the front and FIG. 8(b) being a diagram observed at an angle.

[0006] As shown in FIG. 8(a), when multiple image lines 101 are observed from the front, they are perceived as black lines. However, as shown in FIG. 8(b), by changing the observation angle, brightness corresponding to the minute changes in image height of the image lines 101 is perceived, and the difference in brightness corresponding to the image height allows the latent image 3' to be perceived. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6300092 Summary of the Invention [Problem to be solved by the invention]

[0008] 8, the latent image 3' can be viewed by changing the observation angle, but for a background portion 102b made up of multiple image lines (black lines) 101 that do not vary in image height, the image density of 50% does not change even when the observation angle is changed, and the gradation is compressed with the base density set to 50%. For example, if the image lines 101 are black, the background portion 102b is viewed as gray, which is 50% of the density of black.

[0009] Therefore, an object of the present invention is to provide a special latent image pattern forming body that can realize a full range of gradation, which is a state in which all 256 gradations from "0 to 255" can be expressed, and can obtain high contrast. [Means for solving the problem]

[0010] The special latent image forming body of the present invention described in claim 1 has a printing area on at least a portion of the surface of a substrate, and the printing area has a plurality of first image lines arranged regularly in a predetermined direction, and the first image lines are formed at a first image line height that varies in part, and by changing the observation angle relative to the surface of the substrate, a latent image is visible due to differences in brightness corresponding to the first image line height.The special latent image forming body is characterized in that it has a plurality of second image lines arranged regularly in a predetermined direction, and the second image lines are arranged adjacent to at least one of the first image lines, and the second image lines are formed at a second image line height that varies in part, and the first image lines are a first color, the second image lines are a second color, and the first color is a color lower in brightness than the second color.

[0011] The present invention described in claim 2 is characterized in that, in the special latent image pattern forming body described in claim 1, the first image line height of the first image line and the second image line height of the second image line arranged adjacent to the first image line have a negative correlation.

[0012] The present invention described in claim 3 is characterized in that, in the special latent image pattern forming body described in claim 1 or 2, the first image line further has a second layer stacked on the first image line, the first image line and the second layer form a first image line height, the first image line is a first color, and the second layer is a third color that is brighter than the first color and lower than the second color.

[0013] The present invention as set forth in claim 4 is characterized in that in the special latent image pattern forming body as set forth in claim 3, one color is black, the second color is white, and the third color is a chromatic color. [Effects of the Invention]

[0014] According to the special latent image pattern forming body of the present invention, a high contrast latent image can be obtained that realizes a full range of gradation, which is a state in which all 256 gradations from "0 to 255" can be expressed. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing a special latent image forming unit according to an embodiment of the present invention; [Figure 2] FIG. 10 is an explanatory diagram showing the configuration of a latent image formed in the printing area of the special latent image pattern forming body. [Figure 3] FIG. 3 is an explanatory diagram showing how a latent image appears in the configuration of FIG. 2; [Figure 4] FIG. 10 is an explanatory diagram showing the structure and appearance of a latent image formed in the printing area of a special latent image pattern forming body according to another embodiment of the present invention. [Figure 5] FIG. 10 is an explanatory diagram showing the structure and appearance of a latent image formed in the printing area of a special latent image pattern forming body according to yet another embodiment of the present invention. [Figure 6] FIG. 1 is an explanatory diagram showing an example of a method for producing a latent image to be applied to the printing area of the special latent image forming body of the present invention. [Figure 7] Schematic diagram showing a latent image according to the prior art [Figure 8] 8 is an explanatory diagram showing different observation angles of the latent image shown in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0016] A specific latent image pattern forming body according to a first embodiment of the present invention has a plurality of second objects regularly arranged in a predetermined direction, the second objects being arranged adjacent to the first objects, the first objects being a first color with low brightness, the second objects being a second color with high brightness, and when the height of the first objects is a first height, the height of the second objects adjacent to the first objects is a second height. According to this embodiment, a high-contrast latent image can be obtained.

[0017] In a second embodiment of the present invention, in the first embodiment, the first image has a first layer disposed on the surface of the base material and a second layer laminated on the first layer, the first and second layers form a first image height, the first layer is a first color, and the second layer is a third color whose lightness is higher than that of the first color and lower than that of the second color. According to this embodiment, coloring can be applied to the latent image.

[0018] The third embodiment of the present invention is the same as either the first or second embodiment, except that the third color is a chromatic color. According to this embodiment, it is possible to maximize the brightness difference and also to apply coloring.

[0019] The fourth embodiment of the present invention uses cyan, magenta, and yellow as the third color in the third embodiment, and according to this embodiment, a full-color latent image can be obtained. [Example]

[0020] A special latent image forming body according to one embodiment of the present invention will now be described.

[0021] FIG. 1 is a plan view showing a special latent image pattern forming body according to a first embodiment as an example of the present invention, where FIG. 1(a) shows the special latent image pattern forming body of this example as observed from the front, and FIG. 1(b) shows the special latent image pattern forming body of this example as tilted.

[0022] The special latent image pattern forming body R of this embodiment is, for example, a valuable printed matter such as a banknote, a passport, or an identification card, or a card such as a cash card, and paper or plastic is used for the substrate 1. The special latent image pattern forming body R of this embodiment has a printing area 2 on at least a part of the surface of the substrate 1. The printing area 2 has a latent image 3 with gradations that become visible depending on the viewing angle.

[0023] Figure 2 is an explanatory diagram showing the configuration of the latent image 3 applied to the printing area 2 of the special latent image pattern forming body R of this embodiment, where Figure 2(a) is the latent image 3 of the special latent image pattern forming body R of this embodiment, and Figure 2(b) is a conventional latent image 3' as a comparative example.

[0024] As shown in Figure 2(a), the printing area 2 of the specific latent image pattern forming body R of this embodiment has a plurality of first objects 10 arranged regularly in a predetermined direction, and a plurality of second objects 20 arranged regularly in a predetermined direction. The predetermined direction and regularity for arranging the plurality of first objects 10 and the plurality of second objects 20 are the same. The second objects 20 are arranged adjacent to at least one of the first objects 10.

[0025] The first object 10 is a first color, and the second object 20 is a second color. The first color is a color with a lower brightness than the second color. In FIG. 2(a), the first color forming the first object 10 is shown as black, and the second color forming the second object 20 is shown as white.

[0026] By making the first color forming the first object 10 a color with lower brightness than the second color forming the second object 20, when the special latent image pattern forming body R is tilted, a "gray" background area is visible around the black latent image 3 in the past due to the "base color" of the substrate 1 and the "black" of the first object 10, but in the present invention, the background area is visible as "white." Therefore, the brightness difference between the latent image 3 and the background area is greater than in the past, making it possible to view the latent image 3 as a high-contrast image.

[0027] The first object line 10 has a first object line height H1 that varies in parts. Similarly, the second object line 20 has a second object line height H2 that varies in parts. "Varying the first object line height H1 or the second object line height H2" means varying the height within a single first object line 10 or second object line 20, or maintaining a constant height within a single first object line 10 or second object line 20 while varying the height within multiple first object lines 10 or second object lines 20.

[0028] As shown in Figure 2(a), the four first objects 10 are designated as first objects 11, 12, 13, and 14, respectively, and the second objects 20 adjacent to the first objects 10 are designated as second objects 21, 22, 23, and 24, respectively.

[0029] The second object 20 adjacent to the first object 11 is designated as the second object 21, the second object 20 adjacent to the first object 12 is designated as the second object 22, the second object 20 adjacent to the first object 13 is designated as the second object 23, and the second object 20 adjacent to the first object 14 is designated as the second object 24.

[0030] Hereinafter, when describing multiple first object lines 10, they will be referred to as "first object line 10," but when describing one object line, they will be referred to as first object line 11 to first object line 14. When describing multiple second object lines 20, they will be referred to as "second object line 20," but when describing one object line, they will be referred to as second object line 21 to second object line 24.

[0031] 2(a), the first image height H1a of the first image lines 11 and 12 is set to "low," and the first image height H1b of the first image lines 13 and 14 is set to "high." In the following description, the image height of the multiple first image lines 10 will be referred to as the first image height H1.

[0032] The second image line height H2 of the second image line 20 adjacent to the first image line 10 is a second height relative to the first image line height H1, so the second image line height H2b of the second image line 21 and the second image line 22 is referred to as "high," and the second image line height H2a of the second image line 23 and the second image line 24 is referred to as "low." Hereinafter, when describing the image line heights of the multiple second image lines 20, they will be referred to as the second image line height H2.

[0033] As shown in Figure 2(b), the printing area 2' of a conventional latent image 3' as a comparative example has a plurality of first object lines 10' arranged regularly in a predetermined direction, but does not have a plurality of second object lines 20' adjacent to the first object lines 10', and only a plurality of first object lines 10' are arranged in the printing area 2'.

[0034] At cross-sectional position C'-C' shown in Figure 2(b), the first staging height H1a' of the first staging lines 11' and 12' is defined as "low," and the first staging height H1b' of the first staging lines 13' and 14' is defined as "high." To compare appearance, the first staging height H1a of the first staging lines 11 and 12 shown in Figure 2(a) and the first staging height H1a' of the first staging lines 11' and 12' shown in Figure 2(b) are defined as the same staging height, and the first staging height H1b of the first staging lines 13 and 14 shown in Figure 2(a) and the first staging height H1b' of the first staging lines 13' and 14' shown in Figure 2(b) are defined as the same staging height.

[0035] Hereinafter, when describing the image height of the plurality of first image lines 10', it will be referred to as the first image height H1', and when describing the image height of the plurality of second image lines 20', it will be referred to as the second image height H2'. do.

[0036] In the present invention, the "first image line height H1," which is the height of the first image line 10, and the "second image line height H2," which is the height of the second image line 20, are configured to have a relationship that allows the second image line 20 to hide the first image line 10 when the observation angle of the special latent image pattern forming body R is changed, and are configured to have a negative correlation. A negative correlation indicates a correlation in which when one increases, the other correspondingly decreases, and the first image line height H1, which is the height of the first image line 10, and the second image line height H2, which is the height of the second image line 20 arranged adjacent to the first image line 10, have approximately such a relationship.

[0037] For example, if the first stentatious height H1 and the second stentatious height H2 are formed in six levels, the following relationship holds: If the first stentatious height H1 is "0," "10 μm," "20 μm," "30 μm," "40 μm," and "50 μm," the sum of the minimum value "0" and the maximum value "50 μm" is "50 μm." In this case, the second stentatious height H2 of the second stentatious line 20 disposed adjacent to at least one of the first stentatious heights H1 of the first stentatious line 10 is the height obtained by subtracting the height of the first stentatious line H1 from the sum of the minimum value "0" and the maximum value "50 μm." Note that a height of "0" means that no stentatious line is disposed.

[0038] When the first streak 10 has a first streak height H1 of "0", the second streak height H2 of the second streak 20 arranged adjacent to at least one of the first streak lines is "50 μm", which is the sum of the minimum value "0" and the maximum value "50 μm", minus "0". Similarly, the second streak height H2 of the second streak 20 arranged adjacent to at least one of the first streak lines having a first streak height H1 of "10 μm" is "40 μm", which is the sum of the first streak height H1 of "50 μm" minus "10 μm". The second streak height H2 of the second streak 20 arranged adjacent to at least one of the first streak lines having a first streak height H1 of "20 μm" is "20 μm" minus the sum of the first streak height H1 of "50 μm". The second image height H2 of the second image line 20 arranged adjacent to at least one of the first image heights H1 "30 μm" is "20 μm" obtained by subtracting "30 μm" from the sum "50 μm", the second image height H2 of the second image line 20 arranged adjacent to at least one of the first image heights H1 "40 μm" is "10 μm" obtained by subtracting "40 μm" from the sum "50 μm", and the second image height H2 of the second image line 20 arranged adjacent to at least one of the first image heights H1 "50 μm" is "0" obtained by subtracting "50 μm" from the sum "50 μm".

[0039] Furthermore, even if the first image line height H1 of the first image line 10 and the second image line height H2 of the second image line 20 adjacent to the first image line 10 are not completely negatively correlated, they can be appropriately set in a configuration that allows the second image line 20 to hide the first image line 10 when viewed by changing the observation angle of the special latent image pattern forming body R.

[0040] FIG. 3 is an explanatory diagram showing how the latent image (3, 3') appears in the configuration of FIG. 2, where FIG. 3(a) shows the latent image 3 of the special latent image pattern forming body R of this embodiment, and FIG. 3(b) shows a conventional latent image 3' as a comparative example.

[0041] As shown in Figures 3(a) and 3(b), in both cases, by changing the observation angle with respect to the surface of the base material (1, 1'), images with heights, such as the multiple first images (10, 10'), overlap each other due to blind spots with adjacent images, and therefore the multiple first images (10, 10') are perceived with brightness corresponding to the first image heights (H1, H1'). Therefore, the latent images (3, 3') are perceived with differences in brightness corresponding to the first image heights (H1, H1'). Furthermore, at the position of viewpoint P1, the first image height H1 of the fine portions of the first images (13, 13') and the first images (14, 14') is "high," and therefore "black" is perceived in both Figures 3(a) and 3(b).

[0042] On the other hand, as shown in Figure 3(a), the specific latent image pattern forming body R of this embodiment has a second object line (20). At the position of viewpoint P2, the second object line height H2 of the fine portions of second object line 21 and second object line 22 is "high," so "white" is perceived. Therefore, a white background portion 3b is perceived around the black latent image 3.

[0043] In contrast, in the conventional latent image 3', as shown in Figure 3(b), at the position of viewpoint P2, the first image height H1 in the fine portion of the first image 12' is "low," and there is no second image 20, so when the base color of the substrate 1 is white, "gray" is perceived due to the "white base color" and the "black" of the first image 12'. Therefore, a gray background portion 3b' is perceived around the black latent image 3', and the latent image 3 has low contrast with the background portion 3b', resulting in low visibility.

[0044] Thus, according to this embodiment, the second object 20 is positioned adjacent to at least one side of the first object 10, and the first color of the first object 10 is made to have a lower brightness than the second color of the second object 20, so that the latent image 3 can be viewed as having a high contrast against the background portion 3b.

[0045] Furthermore, in the past, the background portion 3b' of the latent image 3', which can be viewed by changing the observation angle, was gray, and therefore the gradation of the latent image 3' could only be expressed from gray to black out of 256 gradations, resulting in limited-range gradation. On the other hand, in this embodiment, by arranging the second image 20, it is possible to express the background portion 3b of the latent image 3 in white, and it is possible to realize full-range gradation, in which the gradation of the latent image 3 can express all 256 gradations.

[0046] Figure 4 is an explanatory diagram showing the structure and appearance of the latent image 3 applied to the printing area of the special latent image pattern forming body R in the second embodiment as another example of the present invention, where Figure 4(a) shows the structure of the latent image 3 of the special latent image pattern forming body R in this example, and Figure 4(b) shows the appearance of the latent image 3.

[0047] 4(a), the printing area 2 of the special latent image pattern forming body R in the second embodiment is provided with a plurality of first objects 10 regularly arranged in a predetermined direction, and a plurality of second objects 20 regularly arranged in a predetermined direction. Note that in the second embodiment, the predetermined direction and rules for arranging the first objects 10 and the second objects 20 are the same as in the first embodiment.

[0048] Unlike the first embodiment described above, the first object 10 is characterized by a two-layer structure, having a first object 10X disposed on the surface of the substrate 1 and a second layer 10Y laminated on the first object 10X. Hereinafter, when a two-layer object is included and an object having a two-layer structure is described, the first object 10X, which is the first layer, will be described as the "first layer 10X."

[0049] The first image height H1 is formed by the image height of the first layer 10X and the image height of the second layer 10Y. The first layer 10X is a first color with low lightness, and the second layer 10Y is a third color with higher lightness than the first color but lower lightness than the second color. The second image 20 is a second color with high lightness.

[0050] 4, the first layer 10X is shown in black, the second image 20 is shown in white, and the second layer 10Y is shown in red. The third color can be either an achromatic color or a chromatic color as long as the above-mentioned brightness relationship is satisfied.

[0051] The second object 20 is disposed adjacent to the first object 10. The first object 10 here refers to both a first object having a two-layer structure and a first object formed of only the first layer as described above with reference to Figures 2 and 3.

[0052] The first object lines 10 have different first object line heights H1. When the first object line 10 shown in Fig. 4(a) has a single layer structure like the first object line 11, the first object line height H1 is the height of the single layer. When the first object line 10 has a two-layer structure like the first object line 13, the first object line height H1 is the combined height of the first layer 10X and the second layer 10Y, resulting in a two-layer structure. Similarly, the second object line 20 has a different second object line height H2, which is the object height of the second object line 20.

[0053] As shown in Figure 4(a), the four first lines 10 are designated as first lines 11, 12, 13, and 14, respectively, and the second lines 20 adjacent to the first lines 10 are designated as second lines 21, 22, 23, and 24, respectively.

[0054] The second object 20 adjacent to the first object 11 is designated as the second object 21, the second object 20 adjacent to the first object 12 is designated as the second object 22, the second object 20 adjacent to the first object 13 is designated as the second object 23, and the second object 20 adjacent to the first object 14 is designated as the second object 24.

[0055] 4(a), the first image height H1 of the first image lines 11 and 12 is set to "low" only for the first layer 10X, and the first image height H1 of the first image lines 13 and 14 is set to "high" for the first layer 10X and the second layer 10Y. Note that the first image height H1 of the first image line 11, the first image height H1 of the first image line 12, and the first image height H1 of the first image lines 13 and 14 on the first layer 10X are all the same height.

[0056] The second image line height H2 of the second image line 20 adjacent to the first image line 10 is the second image line height H2 relative to the first image line height H1 when the first image line 10 is defined as the first image line height H1, so the second image line height H2 of the second image line 21 and the second image line 22 is defined as "high", and the second image line height H2 of the second image line 23 and the second image line 24 is defined as "low".

[0057] As shown in Figure 4(b), at the position of viewpoint P1, the first line height H1 of the fine parts of the first line 13 and the first line 14 is "high", and since the first layer 10X of the first line 13 is "black" and the second layer 10Y is "red", the "red" is mixed with the "black" and "brown" is visually perceived.

[0058] Furthermore, at the position of the viewpoint P2, the second object line height H2 of the second object line 21 is "high" and the second object line 21 is "white", so that the second object line 21 is visually perceived as "white".

[0059] On the other hand, at the position of viewpoint P3, the first line height H1 of the first line 13 is "high", and the first layer 10X of the first line 13 is "black" and the second layer 10Y is "red", so the "red" is transmitted and only the "black" is visible. As described above, according to the second embodiment, which is the present example, a latent image 3 with high contrast can be obtained, and if the third color is a chromatic color, the latent image 3 can be colored.

[0060] Figure 5 is an explanatory diagram showing the structure and appearance of the latent image applied to the printing area of the special latent image pattern forming body R of the third embodiment, which is yet another example of the present invention, where Figure 5(a) shows the structure of the latent image 3 of the special latent image pattern forming body R of this example, and Figure 5(b) shows the appearance of the latent image 3.

[0061] As shown in Figure 5(a), the printing area 2 of the special latent image pattern forming body R of this embodiment has, as in the second embodiment, a plurality of first object lines 10 arranged regularly in a predetermined direction and a plurality of second object lines 20 arranged regularly in a predetermined direction.

[0062] As in the second embodiment, the first object 10 has a two-layer structure, with a first object 10X placed on the surface of the substrate 1 and a second layer 10Y laminated on the first object 10X. Hereinafter, when a two-layer object is included and an object having a two-layer structure is described, the first object 10X, which is the first layer, will be described as the "first layer 10X."

[0063] In this embodiment, the first layer 10X and the second layer 10Y form a first image height H1. The first layer 10X is a first color having a low brightness, the second layer 10Y is a third color having a brightness higher than that of the first color but lower than that of the second color, and the second image 20 is a second color having a high brightness. In FIG. 5, the first layer 10X is shown in black, the second image 20 is shown in white, and the second layer 10Y is shown in red.

[0064] The second object 20 is disposed adjacent to the first object 10 . The first object lines 10 have a different first object line height H1, which is the object line height of the first object line 10. Similarly, the second object lines 20 have a different second object line height H2, which is the object line height of the second object line 20.

[0065] As shown in Figure 5(a), the four first objects 10 are designated as first objects 11, 12, 13, and 14, respectively, and the second objects 20 adjacent to the first objects 10 are designated as second objects 21, 22, 23, and 24, respectively.

[0066] The second object 20 adjacent to the first object 11 is designated as the second object 21, the second object 20 adjacent to the first object 12 is designated as the second object 22, the second object 20 adjacent to the first object 13 is designated as the second object 23, and the second object 20 adjacent to the first object 14 is designated as the second object 24.

[0067] In addition, in the cross-sectional position shown in FIG. 5(a), the first object height H1 of the first object 11, the first object 12, the first object 13, and the first object 14 is set to "low" in the first layer 10X. In this embodiment, the first object line 13 and the first object line 14 are formed by laminating the second layer 10Y on the first layer 10X.

[0068] The second image height H2 of the second image line 20 adjacent to the first image line 10 is the image height relative to the first image line height H1, and therefore the second image height H2 of the second image line 21, the second image line 22, the second image line 23, and the second image line 24 is set to "high."

[0069] As shown in Figure 5(b), at the position of viewpoint P1, the second layer 10Y of the first image line 13 is "red", the second image line height H2 of the second image line 22 and the second image line 23 is "high", and the second image line 22 and the second image line 23 are "white", so a "light orange" color is visible.

[0070] Furthermore, at the position of viewpoint P2, the second object line height H2 of second object line 21 and second object line 22 is "high" and second object line 21 and second object line 22 are "white", so "white" is visually perceived.

[0071] On the other hand, at the position of viewpoint P3, the first layer 10X of the first image line 13 is "black" and the second layer 10Y is "red", so the "red" is transmitted and only the "black" is visible.

[0072] As described above, according to this embodiment, a latent image 3 with high contrast can be obtained, and the latent image 3 can be colored. In this embodiment, the first objects 10 and the second objects 20 are shown at the same pitch, but some of them may be at different pitches.

[0073] In addition, in this embodiment, the first image line 10 and the second image line 20 are shown as straight lines, but they may also be known image lines such as sine waves, triangular waves, sawtooth waves, rectangular waves, etc., and images formed in a line from pixels or points in a circular, polygonal, or character shape are also considered image lines in the present invention. Furthermore, a partially broken image line is also included in the image line of the present invention.

[0074] In addition, in this embodiment, the first image line height H1 is set to either "high" or "low" to explain the basic configuration, but it is preferable to form it in three or more stages, and if the first image line height H1 has three or more stages, the second image line height H2 will also have three or more stages, and will be the second image line height H2 relative to the first image line height H1.

[0075] In addition, in this embodiment, the first object 10 is black and the second object 20 is white, but they are not limited to black and white. Furthermore, in the above embodiment, the second layer 10Y is described as being "red," but it is not limited to one color; by using multiple colors such as cyan, magenta, and yellow to correspond to fine details, a full-color latent image 3 can be obtained.

[0076] FIG. 6 is an explanatory diagram showing an example of a method for producing the latent image 3 to be applied to the printing area of the specific latent image pattern forming body R of the present invention.

[0077] An original image to be used as the latent image 3 is input to create a positive image (S11).

[0078] Then, based on the positive image created in S11, the height of the fine portion of the first image line 10 is determined (S12).

[0079] If the latent image 3 is to be colored, the third color is determined for each fine portion (S13).

[0080] In S14, first image data is generated based on the height data for each fine portion determined in S12 and, in the case of color, the chromatic color data for each fine portion determined in S13.

[0081] On the other hand, an original image to be used as the latent image 3 is input to create a negative image (S21).

[0082] Then, based on the negative image created in S21, the height of the fine part of the second image line is determined (S22).

[0083] In S24, second image data is generated based on the height data for each minute part determined in S22.

[0084] Using the first image data generated in S14 and the second image data generated in S24, a latent image 3 to be applied to the printing area 2 can be produced by layer printing using, for example, a UV inkjet printer. [Explanation of symbols]

[0085] 1 Base material 2 Print area 3 Latent Image 10, 11, 12, 13, 14 First stroke 10X 1st layer (1st drawing line) 10Y 2nd layer 20, 21, 22, 23, 24 Second stroke R Special latent image pattern former H1 First streak height H2 Second streak height P1, P2, P3 viewpoints

Claims

1. a printed area on at least a portion of a surface of the substrate; The printing area has a plurality of first image lines regularly arranged in a predetermined direction, the first image line is formed at a first image line height that is partially different from the first image line height; A special latent image forming body in which a latent image is visible due to a difference in brightness corresponding to the first image line height by changing an observation angle with respect to the surface of the base material, a plurality of second image lines regularly arranged in the predetermined direction; The second image is adjacent to at least one of the first images. Place the second image line is formed at a second image line height that is partially different from the first image line height, the first image line is a first color, and the second image line is a second color; The special latent image forming body is characterized in that the first color is a color lower in brightness than the second color.

2. 2. The specific latent image forming body according to claim 1, wherein a first image height of the first image line and a second image height of the second image line disposed adjacent to the first image line have a negative correlation.

3. The first image further includes a second layer laminated on the first image, the first image height is formed by the first image and the second layer; 3. The special latent image pattern forming body according to claim 1, wherein the first image line is the first color, and the second layer is a third color that is brighter than the first color and lower than the second color.

4. 4. The special latent image forming member according to claim 3, wherein the first color is black, the second color is white, and the third color is a chromatic color.

Images