JP2021115799A - Latent image pattern expression structure and preparation method of phase modulation pattern data - Google Patents

Abstract

To provide a latent image pattern expression structure provided with a phase modulation pattern in which concealment of a pattern of the latent image expressed by a phase difference by normal time observation, in a phase modulation pattern of which latent image can be recognized, by observing by overlapping a hair line pattern.SOLUTION: There is provided a latent image pattern expression structure in which a latent image pattern can be recognized by overlapping a phase modulation pattern differentiated into a latent image part and a background part due to difference of a phase of a part where colored streaks are arranged in hair lines, and hair line pattern, in which the latent image pattern is formed of the latent image streaks in which latent image constituent streaks are arranged in a phase different from the streaks of the background part and concentration alleviating streaks arranged in the same phase with at least a part of the streaks of the background adjacently formed, thereby concealment of the latent image pattern is improved.SELECTED DRAWING: Figure 3

Description

The present invention is a part of the screens arranged in a universal pattern, which is provided in securities such as banknotes, stocks, bonds, etc., security printed materials required to prevent forgery and falsification of various certificates and important documents, etc. The present invention relates to a latent image pattern expression structure in which a latent image pattern can be visually recognized by observing a perimeter pattern superimposed on a phase modulation pattern in which a latent image pattern appears due to a different phase.

Security printed matter such as banknotes, passports, and securities is required to be difficult to forge or copy due to its nature. As a typical measure to improve security, a measure to embed an invisible image called a latent image is common, and one of the measures is to use phase modulation. A technique using phase modulation is, for example, one of which is a perennial pattern (a pattern in which a plurality of straight lines or wavy lines having a uniform line width are arranged at a predetermined period) and the other of which is a latent image for one of the perennial patterns. There is a phase-modulated multi-line pattern that is phase-modulated according to the density gradation.

As a technology that makes it possible to create a latent image of the front and back composite patterns by using the perimeter pattern and the phase-modulated perimeter pattern, the perimeter pattern is created on either the front or back of the printed material that transmits light by using perimeter lines or mesh dots. On the other side, a phase-modulated 10,000-line pattern consisting of image lines with a pattern that should be a latent image by many lines or mesh dots is printed so that the print positions match each other, and this printed matter is watermarked with light. There is a technique in which the patterns on the front and back are combined and the latent image appears as a continuous gradation image.

In this technique, the 10,000-line pattern (100) formed on one surface of the object to be printed has a one-to-one relationship between image lines and non-image lines, as shown in FIG. 1 (a). As shown in FIG. 1 (b), the phase-modulated multi-line pattern (110) formed on the other surface of the printed matter has a phase difference (here, an image) with respect to the period of the image by an arbitrary phase modulation method. It is a configuration that expresses the Arabic numeral of "1" by providing a half cycle of the line cycle). It should be noted that the relationship between the image line and the non-image line of the phase-modulated multi-line pattern (110) in FIG. The image line representing the number "1" and the image line around it are arranged in different phases. Then, when the printed matter having the perimeter pattern (100) shown in FIG. 1 (a) and the phase-modulated perimeter pattern (110) shown in FIG. 1 (b) is observed in an environment where transmission can be seen, FIG. 1 ( As shown in c), the region where there is no phase difference in the phase-modulated multi-line pattern (110) overlaps at the same position as the multi-line pattern (100), while the phase-modulated multi-line pattern (110) has a phase difference. Since the region does not overlap with the 10,000-line pattern (100), a shade difference is generated, and the Arabic number "1" can be visually recognized as a latent image. It should be noted that the appearance of an arbitrary image by superimposing two types of patterns with such periodicity is also called a moire expression phenomenon, and is applied as various anti-counterfeiting techniques in security printed matter.

Further, the applicant has applied for a front-back pattern composite printed matter in which a latent image can be visually recognized with gradation when observed in a transmission-viewing environment with respect to the phase-modulated multi-line pattern (110) shown in FIG. For example, see Patent Document 1). The technique of Patent Document 1 allows a latent image with a shade to be visually recognized by providing a phase difference according to the shade of the image information, and the larger the phase difference, the darker the latent image is visually recognized in transmission. Although it is different from the configuration of the front and back pattern composite printed matter of Patent Document 1, according to the principle of Patent Document 1, for example, as shown in FIG. 2 (a) with respect to the phase-modulated multi-line pattern (110) shown in FIG. In the case of the phase-modulated multi-line pattern (110') in which the phase difference of 1/4 period is provided with respect to the period of the image, the phase difference is larger than that of the phase-modulated multi-line pattern (110) of FIG. 1 (b). Due to its small size, in a transmission environment, a latent image having a lighter density than the latent image shown in FIG. 1 (c) can be visually recognized (FIG. 2 (b)).

Further, the applicant has applied for a front-back pattern composite printed matter in which a latent image appears as a color image when observed in an environment where transmission can be seen by using the technique of Patent Document 1 (see, for example, Patent Document 2). ). The technique of Patent Document 2 is a process color separation or artificial color coding of a decomposed image of the three primary colors of cyan, magenta, and yellow, which is phase-modulated for each color and has various screen patterns such as halftone dots and halftone dots. Is applied to one side of the object to be printed and a magenta pattern is applied to the other side of the object to be printed. Is visible.

In addition, as a technique for visually recognizing a latent image when observing at an angle using a phase-modulated perennial pattern, a concave-convex shape is formed on a base material at a predetermined pitch, and one surface which is a side portion of the concave-convex shape is further formed. Disclosed is a printed matter in which a latent image pattern is formed by imparting a printed multi-line forming a first pattern to the other surface and a printing perimeter forming a second pattern on the other surface (for example,). See Patent Document 3). In the technique of Patent Document 3, the first pattern and the second pattern are composed of image lines having a phase difference, and the produced printed matter is the first when the base material is tilted from one side of the uneven shape. The pattern is visually recognized, and the second pattern becomes visible when tilted from the side opposite to the uneven shape.

Japanese Unexamined Patent Publication No. 5-139022 Japanese Patent No. 3362171 Japanese Patent No. 4910244

However, as shown in FIG. 1 (c), the phase-modulated perennial pattern used in the prior art of Cited Documents 1 to 3 is such that the latent image can be clearly seen when observed by transmission. , The authenticity can be determined, and the authenticity of the printed matter to be forged can be determined by simply imitating only the ten thousand lines. However, when carefully observed, FIGS. 1 (b) and FIG. As shown in 2 (a), there is a problem that the phase difference provided in the universal line pattern is visually recognized. Specifically, in the areas surrounded by broken lines in FIGS. 1 (b) and 2 (a), the distance between adjacent strokes is shorter than the period of the surrounding strokes, and the color is darker than the surrounding regions. In the area surrounded by the double line in FIGS. 1 (b) and 2 (a), the distance between the adjacent image lines is longer than the period of the surrounding image lines, and the blank is conspicuous. For this reason, there is a problem that an image that appears as a latent image in transmission is also presumed and is likely to be a target of forgery.

The present invention aims to solve the above-mentioned problems, and in a phase modulation pattern in which a latent image can be visually recognized by observing a perimeter pattern in an overlapping manner, a phase difference is observed in normal observation as compared with the conventional case. Provided is a method for creating a latent image pattern expression structure having a phase-modulated pattern with improved concealment of the displayed latent image pattern and data for a phase-modulated pattern.

In the latent image pattern expression structure of the present invention, the phase of a part of the ten thousand lines in which a plurality of colored lines are arranged at a constant pitch in the first direction is different in the first direction, and the latent image portion and the background portion have different phases. It is a latent image pattern expression structure in which the latent image pattern can be visually recognized by overlapping the divided phase modulation pattern and the multi-line pattern in which multiple lines corresponding to the phase modulation pattern are arranged at the same pitch as the colored image lines. The latent image portion includes a latent image constituent image line arranged in a phase different from the image line constituting the background portion and a density relaxation image arranged in the same phase as at least a part of the image line constituting the background portion. A first latent image line and a second latent image line formed adjacent to each other are provided, and the first latent image line has a narrower image width than the image width of the image lines constituting the background portion, and is the first. The distance between the center lines of the adjacent image lines in one direction is smaller than a certain pitch, and the second latent image image line has an image width wider than the image width of the image lines constituting the background portion. It is characterized in that the distance between the center lines of the lines adjacent to each other in the first direction is wider than a constant pitch.

Further, in the latent image pattern expression structure of the present invention, the phase of a part of the ten thousand lines in which a plurality of colored image lines are arranged at a constant pitch in the first direction is different in the first direction, and the latent image portion and the background. A latent image pattern expression structure in which a latent image pattern can be visually recognized by overlapping a phase modulation pattern divided into parts and a multi-line pattern in which multiple lines corresponding to the phase modulation pattern are arranged at the same pitch as colored lines. The latent image portion is a density relaxation image arranged in the same phase as at least a part of the latent image constituent image lines and the image lines constituting the background portion arranged in a phase different from the image lines constituting the background portion. It has at least one first latent image line formed by adjacent lines, and the first latent image line has an image width narrower than the image width of the image lines constituting the background portion and is in the first direction. The feature is that the distance between the center lines of the adjacent image lines is smaller than a certain pitch.

Further, in the latent image pattern expression structure of the present invention, the phase of a part of the ten thousand lines in which a plurality of colored image lines are arranged at a constant pitch in the first direction is different in the first direction, and the latent image portion and the background. A latent image pattern expression structure in which a latent image pattern can be visually recognized by overlapping a phase modulation pattern divided into parts and a multi-line pattern in which multiple lines corresponding to the phase modulation pattern are arranged at the same pitch as colored lines. The latent image portion is a density relaxation image arranged in the same phase as at least a part of the latent image constituent image lines and the image lines constituting the background portion arranged in a phase different from the image lines constituting the background portion. It has at least one second latent image line formed by adjacent lines, and the second latent image line has a width wider than the line width of the lines constituting the background portion and is in the first direction. The feature is that the distance between the center lines of the adjacent image lines is larger than a certain pitch.

Further, in the latent image pattern expression structure of the present invention, the latent image portion constitutes a first latent image line and a latent image portion having the same image width as the image line constituting the background portion. Latent image constituent lines arranged in a phase different from the strokes constituting the background and density-relaxed strokes arranged in the same phase as at least a part of the strokes constituting the background are placed between the strokes. The first latent image line, which is adjacent to each other and has a narrower image width than the image width of the image lines constituting the background portion and a wider image width than the image width of the first latent image line, is further provided. , The width of the latent image constituent lines constituting the first latent image line is wider than the width of the latent image constituent lines constituting the first latent image line, and the first latent image image. The image width of the density-relaxed lines constituting the line is narrower than the image width of the density-relaxed image constituting the first latent image line, and the first latent image lines are adjacent to each other in the first direction. The feature is that the distance between the center line and the matching image line is arranged smaller than a certain pitch.

Further, in the latent image pattern expression structure of the present invention, the latent image portion constitutes a second latent image line and a latent image portion having the same image width as the image line constituting the background portion. Latent image constituent lines arranged in a phase different from the strokes constituting the background and density-relaxed strokes arranged in the same phase as at least a part of the strokes constituting the background are placed between the strokes. It further includes a second latent image line that is adjacent to each other and has a wider image width than the image width of the image lines constituting the background portion and a narrower image width than the image width of the second latent image line. , The width of the latent image constituent lines constituting the second latent image line is wider than the width of the latent image constituent lines constituting the second latent image line, and the second a latent image image. The image width of the density-relaxed image constituting the line is narrower than the image width of the density-relaxed image constituting the second latent image line, and the second latent image image line is adjacent in the first direction. The feature is that the distance between the center line and the matching image line is arranged larger than a certain pitch.

Further, in the latent image pattern expression structure of the present invention, the width of the non-image area between the first latent image line and the adjacent image line is substantially the same. It is characterized by being.

Further, in the latent image pattern expression structure of the present invention, the width of the non-image area between the second latent image line and the adjacent image line is substantially the same. It is characterized by being.

Further, in the latent image pattern expression structure of the present invention, the image lines constituting the latent image portion are composed of complementary colors with the center line of the image line as a boundary, and the image lines constituting the background portion are achromatic. It is characterized by being configured.

Further, in the latent image pattern forming body of the present invention, the above-mentioned phase modulation pattern is formed on the base material, and the universal pattern is as follows: b) The colored lines are the same as the lines constituting the phase modulation pattern. The strokes that are arranged at a constant pitch and are formed on the surface opposite to the surface on which the phase modulation pattern is formed, or (b) convex lenses form the phase modulation pattern. It is formed by being arranged in a universal line with the same constant pitch as, and is formed by overlapping on the phase modulation pattern, or c) the colored strokes have the same constant pitch as the strokes constituting the phase modulation pattern. The phase modulation pattern is concealed under the reflected light laminated on the phase modulation pattern, and is formed on a light-transmitting concealment layer.

Further, the latent image pattern forming body of the present invention includes the above-mentioned phase modulation pattern, and a universal pattern is formed on the base material, and the universal pattern is d) a convex color different from the color of the phase modulation pattern. The strokes of the shape are arranged at the same constant pitch as the strokes constituting the phase modulation pattern, or (e) the colored strokes are arranged at the same constant pitch as the strokes constituting the phase modulation pattern. In the case of (d), a phase modulation pattern is formed on the perimeter pattern, and in the case of (e), the perimeter pattern is concealed under the reflected light laminated on the perimeter pattern, and It is characterized in that a phase modulation pattern is formed on a concealing layer having light transmission.

Further, the method for creating data for a phase modulation pattern of the present invention is a method for creating data for a phase modulation pattern for producing a phase modulation pattern, and is a gray scale base image having a pattern represented by a latent image portion. The base image setting step for setting and the set base image are averaged in density for each region corresponding to twice the pitch of the image lines arranged in the first direction, and an averaged image is generated. A vertical averaging process, a gradation inversion process that inverts the shading of the averaging image to generate an inverted image, and a latent image constituent image by applying the first critical value array image to the averaging image. The density relaxation image is obtained by applying the first critical value array image conversion processing step of generating the first binary image for the image line constituting the latent image portion and the second critical value array image to the inverted image. A second critical value array image conversion processing step for generating a second binary image for a line constituting a line and a background portion, and a phase by synthesizing the first binary image and the second binary image. It is characterized by including a synthesis processing step for generating data for a modulation pattern.

The phase modulation pattern of the present invention is conventional in that a latent image portion that expresses a latent image pattern by a phase difference between the image lines is provided with at least one of a first latent image line and a second latent image line. It is possible to improve the concealment of the latent image pattern as compared with the phase modulation pattern. This solves the problem of being prone to counterfeiting.

Further, according to the method for creating the data for the phase modulation pattern of the present invention, it is possible to create the data for the phase modulation pattern in which the hiding property of the pattern of the latent image is improved as compared with the conventional phase modulation pattern. Easy to create.

It is a figure which shows the structure of the conventional phase modulation pattern. It is a figure which shows another structure of the conventional phase modulation pattern. It is a figure which shows the structure of the latent image pattern expression structure of this invention. It is a figure which shows the structure of the phase modulation pattern of this invention. It is a partially enlarged view of the phase modulation pattern of this invention, and is the figure which shows the structure of the 1st latent image line. It is a figure which shows the detailed structure of the 1st latent image line which constitutes a phase modulation pattern. It is a figure which shows another structure of the 1st latent image line which constitutes a phase modulation pattern. It is a figure which shows the structure of the phase modulation pattern which includes a plurality of first latent image strokes. It is a figure which shows the structure of another region of a phase modulation pattern. It is a partially enlarged view of the phase modulation pattern of this invention, and is the figure which shows the structure of the 2nd latent image line. It is a figure which shows the detailed structure of the 2nd latent image line which constitutes a phase modulation pattern. It is a figure which shows another structure of the 2nd latent image line which constitutes a phase modulation pattern. It is a figure which shows the structure of the phase modulation pattern which includes a plurality of 2nd latent image lines. It is a figure which shows the structure of the latent image pattern form | body which formed the phase modulation pattern and the universal line pattern. It is a figure explaining the effect of the phase modulation pattern of this invention. It is a figure explaining the position where the 1st latent image line and the 2nd latent image line are provided in the phase modulation pattern which provided the latent image part of a different pattern. It is a figure which shows the structure of the phase modulation pattern in which a latent image pattern is visually recognized with a plurality of gradations. It is a partially enlarged view of a phase modulation pattern in which a latent image pattern is visually recognized with a plurality of gradations. It is a figure which shows the 2nd latent image line which constitutes the phase modulation pattern which the latent image pattern is visually recognized with a plurality of gradations. It is a figure which shows the plurality of first latent image lines which form the phase modulation pattern which the latent image pattern is visually recognized with a plurality of gradations. It is a figure which shows the 1st latent image line which constitutes the phase modulation pattern which the latent image pattern is visually recognized with a plurality of gradations. It is a figure which shows the plurality of 2nd latent image lines which form the phase modulation pattern which the latent image pattern is visually recognized with a plurality of gradations. It is a figure which shows another composition of the latent image pattern forming body. It is a figure which shows the composition in which the perimeter pattern is composed of the strokes of a plurality of colors. It is a figure which shows the composition of the all-line pattern which consists of the picture lines of complementary colors adjacent to each other. It is a figure which shows the structure of the latent image pattern forming body in which the concealing layer is laminated. It is a figure which shows the structure of the universal line pattern formed by a lens. It is a figure which shows the composition of the universal line pattern formed by the convex drawing line. It is a figure which shows the structure of the phase modulation pattern which the complementary color relation color is adjacent. It is a figure which shows the structure of the phase modulation pattern of the 2nd Embodiment. It is a figure which shows another structure of the phase modulation pattern of 2nd Embodiment. It is a block diagram which shows the 3rd Embodiment, and shows the data creation apparatus for a phase modulation pattern. FIG. 5 is a flow chart showing a method of creating data for a phase modulation pattern according to a third embodiment. It is a figure which shows the base image set by the base image setting process. It is a figure which shows the grayscale image which was converted by the grayscale conversion process. It is a figure which shows the averaging image averaged by the vertical averaging process. It is a figure which shows the inverted image which inverted the density of the averaged image. It is a figure explaining the 1st critical value array image conversion process. It is a figure explaining the 2nd critical value array image conversion processing. It is a figure explaining the process of synthesizing the image obtained by the critical value array image conversion process. It is a figure explaining the process of synthesizing another region of an image obtained by a critical value array image conversion process. It is a figure which shows the data for a phase modulation pattern. It is a figure which shows the structure of the base image of Example 2. It is a figure which shows the structure of the averaged image of Example 2. FIG. It is a figure which shows the structure of the inverted image of Example 2. FIG. It is a figure which shows the structure of the 1st binary image and the 2nd binary image of Example 2. FIG. It is a figure which shows the data for the phase modulation pattern of Example 2. It is a figure which shows the latent image pattern which can be visually recognized from the latent image pattern forming body of Example 2.

A mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments as long as it is within the scope of the technical idea in the claims.

(Latent image pattern expression structure)
FIG. 3 is a diagram showing the configuration of the latent image pattern expression structure (10), and the latent image pattern expression structure (10) is the phase modulation pattern (20) shown in FIG. 3 (b) and FIG. 3 (c). It consists of the universal line pattern (30) shown in. The detailed configuration of the phase modulation pattern (20) will be described later, but the phase modulation pattern (20) shown in FIG. 3 (b) shows the number "1" by providing a phase difference of 10,000 lines. This is an example. In the latent image pattern expression structure (10) of the present invention, the latent image pattern of the number "1" shown in FIG. 3 (a) is observed by superimposing the phase modulation pattern (20) and the perimeter pattern (30). Although (11) can be visually recognized, it is characterized in that the pattern of the latent image pattern (11) is highly concealed when only the phase modulation pattern (20) is observed. Hereinafter, detailed configurations of the phase modulation pattern (20) and the universal pattern (30) constituting the latent image pattern expression structure (10) of the present invention will be described.

(Phase modulation pattern)
FIG. 4 is a diagram showing the configuration of the phase modulation pattern (20). The phase modulation pattern (20) is a part of a universal line in which colored lines (21) are arranged in the first direction (V1) at a constant pitch (P), as shown in the enlarged view of FIG. By having different phases, the latent image pattern (11) is divided into a latent image portion (20A) representing the pattern (here, an example of the number “1”) and a background portion (20B) representing the background thereof. Hereinafter, the "latent image pattern (11) symbol" may be referred to as the "latent image symbol", but they have the same meaning, and when the description is made using the drawings, the "latent image pattern (11) symbol" is used. ". In the present invention, "the phases of the image lines are different" means that the image lines forming the latent image portion (20A) and the image lines forming the background portion (20B) are orthogonal to each other. It is to be arranged with a shift to. The phase modulation pattern (20) shown in FIG. 4 shows an example in which the image lines constituting the latent image portion (20A) are arranged so as to be displaced in the first direction (V1), but the first direction (20A). It may be arranged so as to be offset in the direction opposite to V1). In the present embodiment, an example in which the image lines constituting the latent image portion (20A) are arranged so as to be displaced in the first direction (V1) will be described. Further, the image lines constituting the background portion (20B) will be described below as "background image line (21B)".

The design represented by the latent image unit (20A) in the present invention is not limited to the number "1", and may be other numbers, characters, symbols, marks, etc., but in the present embodiment, FIG. In order to explain in an easy-to-understand manner the difference in configuration with respect to the conventional phase-modulated multi-line pattern (110) shown in the above, an example with the same symbol will be described.

FIG. 5 solves the problem that the pattern of the latent image is inferred when the interval between adjacent image lines is shorter than a predetermined pitch (period) in the conventional phase-modulated multi-line pattern (110) shown in FIG. It is a figure which shows the structure of the latent image part (20A) of this invention. _{As shown in FIG. 5, the latent image portion (20A) is provided with one first} latent image drawing line (21A 1) at a boundary portion adjacent to the background portion (20B) as an example, and the first latent image portion (20A 1) is provided. As shown in the enlarged view of FIG. 5, the image image line (21A _{1 ) is the latent image constituent image line (21a 1} ) and the background image line (21B) arranged in a phase different from that of the background image line (21B). _{Concentration relaxation screens (21b 1} ) arranged in at least a part of the same phase are adjacent to each other. Here, the fact that the latent image constituent image line (21a ₁ ) is arranged in a phase different from that of the background image line (21B) is on an extension line of the background image line (21B) as shown in the enlarged view of FIG. , The latent image constituent lines (21a) do not overlap and are arranged in phase with the adjacent background line (21B). Further, the fact that the density relaxation image (21b ₁ ) is arranged in the same phase as the background image (21B) means that at least a part of the extension line of the background image (21B) is arranged as shown in the enlarged view of FIG. The density relaxation image (21b ₁ ) is arranged so as to overlap with each other, and in the enlarged view of FIG. 5, the density relaxation image (21b ₁ ) is arranged in the same phase as a part of the background image (21B). The example is shown.

FIG. 6 is a diagram showing a more detailed configuration of the first latent image line (21A _1). The background portion (20B), similarly to the conventional phase modulation line screen pattern (110), a constant image line width background picture lines _{(W B)} (21B) is a plurality of arranged at a constant pitch (P1) NS. Further, in the latent image unit (20A), the second and subsequent strokes from the top are also latent in a phase that is 1/2 pitch different from the background grid (21B), as in the conventional phase-modulated 10,000-line pattern (110). Zogasen (21A ₀₎ is arranged, Senzoga lines (21A ₀₎ is composed of image line width of the background picture line (21B) _{(W B)} and the same image line width _{(W a),} and, It is arranged at the same pitch (P1) as the background image line (21B).

On the other hand, image line width of the first latent image streak _{(21A 1) (W A1)} is streaked width _{(W A} of image line width of the background picture lines _{(W B)} and the latent image streak (21A ₀₎ ) smaller than, image line width of the latent image configuration streak (21a ₁₎ of the image line width (Wa ₁₎ and the concentration relaxation streak (21b ₁₎ (Wb ₁₎ also image line width of the background picture lines (W _B ) is smaller. _{Further, the distance (LA1-B ) between the center lines of the first latent image line (21A 1} ) and the background line (21B) adjacent to each other in the first direction (V1) and the first latent image line. _{The distance (LA1-A0} ) between the center line of (21A ₁ ) and the latent image line (21A ₀ ) is the pitch (P1) at which the latent image line (21A ₀ ) and the background image line (21B) are arranged. Smaller.

According to the configuration shown in FIG. 6, the non-image portion between the latent image portion (20A) and the background portion (20B) is larger than that of the conventional phase modulation universal pattern (110), and the conventional phase modulation universal In the line pattern (110), it is possible to solve the problem that the distance between adjacent image lines is shorter than a predetermined pitch and is visually recognized in a dark color.

Subsequently, in the conventional phase-modulated multi-line pattern (110') shown in FIG. 2, a book that solves the problem that the pattern of a latent image is inferred when the distance between adjacent image lines is shorter than a predetermined pitch. The configuration of the latent image unit (20A) of the present invention will be described with reference to FIG. In addition, also in FIG. 7, the symbol represented by the latent image portion (20A) is an example of the number “1”, and FIG. 7 is a diagram of the symbols represented by the latent image portion (20A) representing the number “1”. It shows the configuration of the same region as the latent image portion (20A) shown in 6. Further, in FIG. 7, the configuration of the background image line (21B) is as described above. Further, the latent image portion (20A), the field lines of the second and subsequent from above is also the same as traditional phase modulation line screen pattern (110 '), image line width of the background picture line (21B) (W _B ) and the latent image streaking of the same image line width _{(W a)} (21A ₀₎ is an example which is arranged offset 1/4 pitch phase from the background picture line (21B). Further, in FIG. 7, the latent image portion (20A) is _{an example in which one first latent image drawing line (21A 1} ) is provided at a boundary portion adjacent to the background portion (20B).

In the latent image unit (20A) shown in FIG. 7, _{the basic configuration of the first latent image line (21A 1} ) is the same as the configuration shown in FIG. 6, and the first latent image line (21A 1) is the same as that shown in FIG. 21A ₁ image line width _{(W A1))} of the image line width of the image line width of the background picture lines _{(W B)} and the latent image streak (21A _{0) (W a)} smaller than, the latent image constituted streak ( 21a ₁ image line width (Wa ₁₎ and the concentration relaxation picture line) (21b ₁₎ of the image line width (Wb ₁₎ also smaller than the image line width of the background picture lines _{(W B). Further, the distance (LA1-B ) between the center lines of the first latent image line (21A 1} ) and the background line (21B) adjacent to each other in the first direction (V1) and the first latent image line. _{The distance (LA1-A0} ) between the center line of (21A ₁ ) and the latent image line (21A ₀ ) is the pitch (P1) at which the latent image line (21A ₀ ) and the background image line (21B) are arranged. Smaller.

According to the configuration shown in FIG. 7, the non-image portion between the latent image portion (20A) and the background portion (20B) is larger than that of the conventional phase-modulated multi-line pattern (110'), and is visually recognized in a dark color. The problem of being done can be solved.

6 and 7, image line width of the first latent image streak _{(21A 1) (W A1)} , a first latent image streak (21A ₁₎ and the adjacent background image line between (21B) The distance of the non-image area (MA1 _-B ) and the distance of the non-image area between the first latent image line (21A ₁ ) and the adjacent latent image image line (21A ₀ ) _(MA1-A0 ). However, if these are the same configuration, the image area ratio per unit area is constant at the boundary between the latent image portion (20A) and the background portion (20B), and there is no difference in shading. This is preferable because it enhances the concealment of the design. The first latent image streak (21A ₁₎ and background image line adjacent to the distance of the non-image area between the _{(21B) (M A1-B} ), the first latent image streak _(21A 1) _{It is also preferable to make the distance (MA1-A0} ) of the non-image portion between the _{latent image image lines (21A 0} ) adjacent to the latent image image line (MA1-A0) the same because the hiding property of the latent image pattern is enhanced. Is more effective.

In the present invention, a plurality of first latent image lines (21A ₁ ) may be provided, and as an example, regarding the configuration of a latent image unit (20A) including _{two first latent image lines (21A 1).} , FIG. 8 will be described.

FIG. 8 is a diagram showing the configuration of a latent image unit (20A) including two first latent image lines (21A ₁ ), and is a symbol represented by the latent image unit (20A) shown in FIG. It is an enlarged view of the area corresponding to a part of 1 ”. 8, illustrating a first latent image streak with the latent image portion (20A) as a code _{(21A 1} -1,21A 1 -2). The background image line (21B) is the same as the above-described configuration, and _{the latent image image line (21A 0} ) is the third and subsequent image lines from the top of the latent image unit (20A).

In the configuration shown in FIG. 8, image line width of the first latent image streak _(21A 1 -1) of the image line width _(W A1 -1) and the first latent image streak _(21A 1 -2) (W _A1 -2) is streaked width of the background image lines _{(W B)} and the latent image streak (21A ₀ image line width) _{(W a)} is less than. Further, image line width of the first latent image streak _{(21A 1 -2) (W A1} -2) , the first latent image streak _(21A 1 -1) of the image line width _(W A1 -1) identical or first latent image streak _(21A 1 -1) of the image line width _(W A1 -1) larger. Further, image line width of the first latent image streak _(21A 1 -2) constitute a latent image structure streak (21a ₁₎ (Wa _1), the first latent image streak _(21A 1 -1) It is larger than the image width (Wa ₁ ) of the latent image constituent image lines (21a _{1) constituting the above.} Further, image line width of the density relaxation image lines constituting the first latent image picture lines _{(21A 1 -2) (21b 1} ) (Wb 1) , the first latent image picture lines _(21A 1 -1) It is smaller than the image width (Wb ₁ ) of the constituent density relaxation image (21b _1). That is, the latent image portion shown in FIG. 8 (20A) is subjected to the first latent image streak _(21A 1 -1) from the latent image streak (21A _0), the latent image constituted streak (21a ₁₎ and concentration relaxation The ratio of the image lines (21b ₁ ) is different, and the composition gradually approaches the composition of the _{latent image image lines (21A 0).}

The distance between the center line of the first latent image streak adjacent in the first direction (V1) _(21A 1 -1) and the background picture line _{(21B) (L A1-B} ), the first latent image streaked _(21A 1 -1) and the first latent image streak _(21A 1 -2) distance between the center line of the _{(L A1-A1)} and the first latent image streak and _(21A 1 -2) latent Zogasen distance between the center line of the _{(21A 0) (L A1-} A0) are Senzoga lines (21A ₀₎ and the background picture line pitch (21B) is disposed (P1) smaller.

Described above, the latent image portion of the configuration shown in FIG. 8 with two first latent image streak _{(21A 1 -1,21A 1 -2) (} 20A) , to the configuration shown in FIG. 6 Since the degree of change in the width of the image line is gradual, the configuration is preferable because it has a high effect of concealing the pattern of the latent image. Further, in the present embodiment has described the example of the latent image portion having two first latent image picture lines _{(21A 1 -1,21A 1 -2) (} 20A), further, a number of first The latent image line may be provided. Here, the configuration shown in FIG. 6 has been described for the two first latent image streak _{(21A 1} -1,21A 1 -2) latent image portion having the (20A), shown in FIG. 7 In the configuration as well, two first latent image lines may be provided in the same manner.

In Figure 8, image line width of the first latent image streak _{(21A 1 -1) (W A1} -1), image line width of the first latent image streak _{(21A 1 -2) (W A1} -2 ), the first latent image streak _(21A 1 -1) and the background image line adjacent (distance non-image area between 21B) _{(M A1-B),} the first latent image streak (21A _{1 The distance (MA1-A1} ) of the non-image section between the -1) and the first latent image line (21A _1-2 ), and the first latent image line (21A _1-2 ) and the latent image image. _{The distances (MA1-A0} ) of the non-image areas (MA1-A0) between the lines (21A ₀ ) show different examples, but if they have the same configuration, the boundary between the latent image area (20A) and the background area (20B). In the portion, the image area ratio per unit area is constant, the difference in shading is eliminated, and the concealment of the latent image pattern is improved, which is preferable. Further, from the first latent image streak _(21A 1 -2) of the image line width _(W A1 -2) is first latent image streak _(21A 1 -1) image line width _(W A1 -1) If so, the first latent image streak distance of the non-image area between the _(21A 1 -1) and the background image line adjacent _{(21B) (M A1-B} ), the first latent image streak (21A ₁ -1) and the first latent image streak (distance non-image area between _{21A 1 -2) (M A1-} A1), a first latent image streak and _(21A 1 -2) latent image _{In the order of the distance (MA1-A0} ) of the non-image portion between the image lines (21A ₀ ), the non-image portion is the smallest (distance ( _MA1-B ) is the smallest, and the distance ( _MA1-A0 )). Is the largest), as it enhances the concealment of the latent image pattern.

FIG. 9 is a diagram showing the configuration of the region surrounded by the broken line in the phase modulation pattern (20) shown in FIG. 4, and is a diagram showing the configuration of the inclined portion of the outline of the number “1”. The inclined portion of the outline of the number “1” shown in FIG. 9 is a portion (enclosed by a broken line) in which the pitch of adjacent strokes is narrowed in the conventional phase modulation universal line pattern (110) shown in FIG. 1 (b). The phase modulation pattern (20) of the present invention also includes a first latent image line (21A ₁ ) in the region. Since the phase modulation pattern (20) shown in FIG. 9 has a stepwise phase difference depending on the position of the image line, each region having a stepwise phase difference is described as a reference numeral (S1, S2, S3, S4). do. Note that the configuration of the background picture line shown in FIG. 9 (21B), Senzoga lines (21A ₀₎ and the first latent image picture lines arranged in the area _{(S1) (21A 1 -1,21A 1} -2) Is the same as the configuration shown in FIG. 8, and therefore the description thereof will be omitted.

First latent image picture lines arranged in the area _{(S2) (21A 1 -1 '} , 21A 1 -2') , also a background picture line (21B) disposed with different phase have been latent image configuration streak ( 21a ₁₎ and the background picture lines (21B) of at least a portion disposed in the same phase concentrations relaxed picture unit line (21b ₁₎ is made adjacent the first latent image streak _(21A 1 -1 ' image line width _(W A1 -1 ') and the first latent image streak _(21A 1 -2') of image line width) _(W A1 -2 '), the image line width of the background picture lines _{(W B} ) Is smaller than. The distance between the center line of the first latent image streak adjacent in the first direction _{(V1) (21A 1 -1 '} ) from the background picture line (21B), the first latent image streak (21A ₁ -1 ') and the first latent image streak _(21A 1 -2') of the center line between the distance and the first latent image streak of _(21A 1 -2 ') and the latent image streak (21A ₀₎ The distance between the center lines is _{smaller than the pitch (P1) where the latent image line (21A 0} ) and the background image line (21B) are arranged.

With the above configuration, even in the region (S2), the non-image portion between the latent image portion (20A) and the background portion (20B) is larger and darker than the conventional phase-modulated multi-line pattern (110'). The problem of being visually recognized by color can be solved.

Keep the configuration shown in FIG. 9, the first latent image picture lines provided in the area _{(S2) (21A 1 -1 '} , 21A 1 -2') , the first Senzoga provided in the area (S1) have the same image line width and line _{(21A 1} -1,21A 1 -2), and preferable because the interval to arrange a high effect of concealing the latent image of the design is the same. Specifically, image line width of the first latent image streak 'image line width _{(W A1 -1 (21A 1 -1} )') and the first latent image streak _(21A 1 -1) (W _A1-1 ) is the same, the ratio of the latent image composition line (21a ₁ ) and the density relaxation line (21b ₁ ) is also the same, and further, the first latent image image line (21A ₁ −) is the same. 2 'image line width _(W A1 -2) of') and the first latent image streak _(21A 1 -2) of the image line width _(W A1 -2) a is the same, the latent image constituted streak ( 21a ₁₎ and the proportion of the density relaxation streak (21b ₁₎ are the same configuration, further, background picture lines arranged in the area (S2) (21B), the first latent image streak _(21A 1 -1 '), The distance between the first latent image line (21A _1-2 ') and the latent image line (21A ₀ ) is the background line (21B) arranged in the area (S1), the first latent image. streaked _(21A 1 -1), the same configuration as the distance between the first latent image streak _(21A 1 -2) and latent image lines (21A _0).

Even in a region (S3), as shown in FIG. 9, two first latent image streak provided in the area _{(S2) (21A 1 -1 '} , 21A 1 -2') in the same manner as in the first Senzoga lines _{(21A 1 -1 '', 21A} 1 -2 '') may be provided, even in a region (S4), the region of the two provided (S2) a first latent image streak (21A ₁ -1 ', _21A 1 -2' in the same manner as in), the first latent image streak _{(21A 1 -1 ''',} 21A 1 -2''') may be provided.

The phase modulation pattern (20) shown in FIG. 9 is an example in which two first latent image lines (21A ₁ ) are provided on the inclined portion of the outline of the number “1” corresponding to the configuration shown in FIG. However, as shown in FIG. 6, when one first latent image line (21A ₁ ) is provided, one first latent image is also provided on the inclined portion of the outline of the number “1”. A picture line may be provided.

Subsequently, in the conventional phase-modulated multi-line pattern (110) shown in FIG. 1, when the distance between adjacent image lines is longer than a predetermined pitch (period), the problem that the pattern of the latent image is inferred is solved. The configuration of the latent image unit (20A) of the present invention will be described with reference to FIG.

FIG. 10 is a book that solves the problem that the pattern of a latent image is inferred when the distance between adjacent image lines is longer than a predetermined pitch in the conventional phase-modulated multi-line pattern (110) shown in FIG. It is a figure which shows the structure of the latent image part (20A) of the invention. As shown in the enlarged view of FIG. 10A, the latent image portion (20A) has one second latent image drawing line (21A ₂ ) at the boundary portion adjacent to the background portion (20B) as an example. comprising a second latent image streak (21A ₂₎ is 10 as shown in the enlarged view of (b), the background picture line (21B) disposed with different phase have been latent image configuration streak _(21a 2) _{And the density relaxation image (21b 2} ) arranged in the same phase as at least a part of the background image (21B) are adjacent to each other.

FIG. 11 is a diagram showing a more detailed configuration of the second latent image line (21A _2). The background portion (20B), similarly to the conventional phase modulation line screen pattern (110), a constant image line width background picture lines _{(W B)} (21B) is a plurality of arranged at a constant pitch (P1) In the latent image section (20A), the image lines above the second from the bottom are also arranged in a phase different from the background image line (21B) by 1/2 pitch, as in the conventional phase-modulated multi-line pattern (110). a have been latent image streak (21A _0), Senzoga lines (21A ₀₎ is composed of image line width of the background picture line (21B) _{(W B)} and the same image line width _{(W a),} Moreover, it is arranged at the same pitch (P1) as the background image line (21B).

On the other hand, image line width of the second latent image streak _{(21A 2) (W A2)} is streaked width _{(W A} of image line width of the background picture lines _{(W B)} and the latent image streak (21A ₀₎ ) Greater. Second latent image picture lines shown in FIG. 11 at (21A _2), image line width of the density relaxation streak (21b ₂₎ (Wb ₂₎ includes a streak width of the background image line (21B) _{(W B)} an example is shown in which the same configuration, the second latent image streak is image line width _{(21A 2) (W A2)} , image line width of the background picture lines _{(W B)} and the latent image streak (21A larger than image line width of _{0) (W a),} the concentration relaxation streak (image line width 21b ₂₎ (Wb ₂₎ is even smaller than the image line width of the background picture line (21B) _{(W B)} good. _{Further, the distance (LA2-B ) between the center lines of the second latent image line (21A 2} ) and the background line (21B) adjacent to each other in the first direction (V1) and the second latent image line. _{The distance (LA0-A2} ) between the center line of (21A ₂ ) and the latent image line (21A ₀ ) is the pitch (P1) at which the latent image line (21A ₀ ) and the background image line (21B) are arranged. Greater.

According to the configuration shown in FIG. 11, the non-image portion between the latent image portion (20A) and the background portion (20B) is smaller than the conventional phase-modulated multi-line pattern (110), so that the pattern of the latent image is smaller. It is possible to solve the problem that a part of is blank and is conspicuously visible.

Subsequently, in the conventional phase-modulated multi-line pattern (110') shown in FIG. 2, a book that solves the problem that the pattern of a latent image is inferred when the distance between adjacent image lines is longer than a predetermined pitch. The configuration of the latent image unit (20A) of the present invention will be described with reference to FIG. In addition, also in FIG. 12, the symbol represented by the latent image portion (20A) is an example of the number “1”, and FIG. 12 is a diagram of the symbols represented by the latent image portion (20A) representing the number “1”. It shows the configuration of the same region as the latent image portion (20A) shown in 11. Further, in FIG. 12, the configuration of the background image line (21B) is as described above, and in the latent image portion (20A), the image line above the second from the bottom is also a conventional phase modulation universal line pattern (110). ') and a similar, image line width of the background picture line (21B) _{(W B)} and the latent image streaking of the same image line width _{(W a)} (21A ₀₎ is, from the background picture line (21B) 1 / This is an example in which the four pitches are arranged out of phase. Further, in FIG. 12, the latent image portion (20A) is _{an example in which one second latent image drawing line (21A 2} ) is provided at a boundary portion adjacent to the background portion (20B).

In the latent image unit (20A) shown in FIG. 12, _{the basic configuration of the second latent image line (21A 2} ) is the same as the configuration shown in FIG. 21A ₂ image line width) _{(W A2)} is greater than the image line width of the image line width of the background picture lines _{(W B)} and the latent image streak _{(21A 0) (W a)} . _{Further, the distance (LA2-B ) between the center lines of the second latent image line (21A 2} ) and the background line (21B) adjacent to each other in the first direction (V1) and the second latent image line. _{The distance (LA0-A2} ) between the center line of (21A ₂ ) and the latent image line (21A ₀ ) is the pitch (P1) at which the latent image line (21A ₀ ) and the background image line (21B) are arranged. Greater.

Even in the configuration shown in FIG. 12, the non-image portion between the latent image portion (20A) and the background portion (20B) is smaller than the conventional phase-modulated multi-line pattern (110'), so that the pattern of the latent image is smaller. It is possible to solve the problem that a part of is blank and is conspicuously visible.

11 and 12, image line width of the second latent image streak _{(21A 2) (W A2)} , the second latent image streak (21A ₂₎ and a background picture line adjacent between (21B) The distance of the non-image area (MA2 _-B ) and the distance of the non-image area between the second latent image line (21A ₂ ) and the adjacent latent image image line (21A ₀ ) ( _MA0-A2 ). However, if these are the same configuration, the image area ratio per unit area is constant at the boundary between the latent image portion (20A) and the background portion (20B), and there is no difference in shading. This is preferable because it enhances the concealment of the design. The second latent image streak (21A ₂₎ and adjacent background image line distance non-image area between the (21B) and _{(M A2-B),} the second latent image streak _(21A 2) _{It is also preferable to make the distance (MA0-A2} ) of the non-image portion between the _{latent image image lines (21A 0} ) adjacent to the latent image image line (MA0-A2) the same because the hiding property of the latent image pattern is enhanced. Is more effective.

With respect to the configuration shown in FIG. 11, a _{plurality of second} latent image lines (21A 2) may be provided, and as an example, a latent image unit ( _{21A 2) including two second latent image lines (21A 2) is provided.} The configuration of 20A) will be described with reference to FIG.

FIG. 13 is a diagram showing the configuration of a latent image unit (20A) including two second latent image lines (21A ₂ ), and is a symbol represented by the latent image unit (20A) shown in FIG. It is an enlarged view of the area corresponding to a part of 1 ”. 13, illustrating a second latent image streak with the latent image portion (20A) as a code _{(21A 2} -1,21A 2 -2). The background image line (21B) is the same as the above-described configuration, and the latent image image line (21A ₀ ) in FIG. 13 is the image line above the third from the bottom of the latent image unit (20A).

In the configuration shown in FIG. 13, image line width of the second latent image streak _(21A 2 -1) of the image line width _(W A2 -1) and a second latent image streak _(21A 2 -2) (W _A2 -2) is greater than the image line width of the image line width of the background picture lines _{(W B)} and the latent image streak _{(21A 0) (W a)} . Further, image line width of the second latent image streak _{(21A 2 -2) (W A2} -2) , the second latent image streak _(21A 2 -1) of the image line width _(W A2 -1) the same or a second latent image streak _(21A 2 -1) of the image line width and _(W A2 -1) smaller. Further, image line width of the second latent image streak _(21A 2 -2) constitute a latent image structure streak (21a ₂₎ (Wa _2), the second latent image streak _(21A 2 -1) It is larger than the image width (Wa ₂ ) of the latent image constituent image lines (21a _{2) constituting the above.} Further, image line width of the density relaxation image lines constituting the second latent image picture lines _{(21A 2 -2) (21b 2} ) (Wb 2) , the second latent image picture lines _(21A 2 -1) It is smaller than the image width (Wb ₂ ) of the constituent density relaxation image (21b _2). That is, the latent image portion shown in FIG. 13 (20A) is subjected to a second latent image streak _(21A 2 -1) from the latent image streak (21A _0), the latent image constituted streak (21a ₂₎ and concentration relaxation The ratio of the image lines (21b ₂ ) is different, and the composition gradually approaches the composition of the _{latent image image lines (21A 0).} In the second latent image picture line shown in FIG. 13 _(21A 2 -2), image line width of the latent image configuration streak (21a ₂₎ (Wa ₂₎ is streaked width of the background image lines (21B) _{(W B)} and shows an example in which the same configuration, image line width of the second latent image streak _{(21A 2 -2) (W A2} -2) is, the background picture line image line width (W larger than image line width of _B) and latent image lines _{(21A 0) (W a)} , the latent image constituted streak (image line width 21a ₂₎ (Wa ₂₎ is, the field of the background picture line (21B) it may be smaller than the line width _{(W B).}

The distance between the center line of the second latent image streak adjacent in the first direction (V1) _(21A 2 -1) and background picture line _{(21B) (L A2-B} ), the second latent image streaked _(21A 2 -1) and the second latent image streak _(21A 2 -2) of the distance between the center line _{(L A2-A2)} and a second latent image streak and _(21A 2 -2) latent Zogasen distance between the center line of the _{(21A 0) (L A0-} A2) is greater than the pitch (P1) of Senzoga lines (21A ₀₎ and the background picture lines (21B) are disposed.

The latent image unit (20A) having the configuration shown in FIG. 13 including the _{two second} latent image lines (21A 2-1 and 21A 2-2) described above has the same configuration as that shown in FIG. Since the degree of change in the width of the image line is gradual, the configuration is preferable because it has a high effect of concealing the pattern of the latent image. Further, in FIG. 13, _{an example of a latent image unit (20A) having two second} latent image lines (21A 2-1 and 21A 2-2) has been described, but many more second latent images have been described. An image line may be provided. Here, the latent image unit (20A) provided with _{two second} latent image lines (21A 2-1 and 21A 2-2) with respect to the configuration shown in FIG. 11 has been described, but is shown in FIG. In the configuration as well, two second latent image lines may be provided in the same manner.

In Figure 13, image line width of the second latent image streak _{(21A 2 -1) (W A2} -1), image line width of the second latent image streak _{(21A 2 -2) (W A2} -2 ), the second latent image streak _(21A 2 distance non-image area between -1) and background image line adjacent _{(21B) (M A2-B} ), the second latent image streak (21A ₂ -1) and the second latent image streak _(21A distance non-image area between the _{2 -2) (M A2-A2} ) and a second latent image streak and _(21A 2 -2) Senzoga _{An example is shown in which the distances (MA0-A2} ) of the non-image areas between the lines (21A ₀ ) are different, but if they have the same configuration, the latent image part (20A) and the background part (20B) At the boundary portion, the image area ratio per unit area is constant, the difference in shading disappears, and the concealment of the latent image pattern is improved, which is preferable. Further, from the second latent image streak _(21A 2 -2) of image line width _(W A2 -2) a second latent image streak _(21A 2 -1) of the image line width _(W A2 -1) smaller, the distance of non-image area between the second latent image streak _(21A 2 -1) and background image line adjacent _{(21B) (M A2-B} ), the second latent image streak (21A ₂ -1) and the distance of non-image area between the second latent image streak _{(21A 2 -2) (M A2} -A2), a second latent image streak and _(21A 2 -2) latent image _{In the order of the distance (MA0-A2} ) of the non-image portion between the image lines (21A ₀ ), the non-image portion has the largest configuration (distance ( _MA2-B ) is the largest, and the distance ( _MA0-A2 )). Is the smallest), as it enhances the concealment of the latent image pattern.

Although a part of the configuration of the phase modulation pattern (20) of the present invention shown in FIG. 10 has been enlarged and described in FIGS. 11 and 13, the region surrounded by the broken line shown in FIG. 10 is also shown in FIG. 1 (b). In the conventional phase modulation universal line pattern (110) shown, a portion corresponding to a portion where the pitch of adjacent strokes becomes long is provided, and a second latent image stroke is also provided in this region. _{In this case, the second latent image line (21A 2} ) shown in FIG. 11 or 13 may be provided corresponding to the inclined portion of the contour of the number “1” (not shown). Similarly, in the phase-modulated multi-line pattern (110') shown in FIG. 2A, the second latent image drawing line shown in FIG. 12 corresponds to the inclined portion of the outline of the number “1”. 21A ₂ ) may be provided (not shown).

As an example, the phase modulation pattern (20) of the present invention having the above configuration is formed on at least a part of the sheet-like base material (2) made of paper, film, plastic or the like shown in FIG. 14 (a). It is formed by printing colored ink of a color different from (2). As a means for printing the phase modulation pattern (20), a printing machine such as offset printing, flexographic printing, screen printing, etc., and an inkjet printer or a laser printer can be used. Further, the method of forming the phase modulation pattern (20) on the base material (2) may be a method of printing by laser irradiation, and is not particularly limited as long as it is a method of imparting color to the base material (2). do not have. Hereinafter, the base material (2) provided with the phase modulation pattern (20) is referred to as a "latent image pattern forming body (1)".

Further, the universal pattern (30) is formed by printing colored ink on the light transmissive base material (3) shown in FIG. 14 (b) as an example. The color of the universal pattern (30) may be the same as or different from that of the phase modulation pattern (20). As shown in the enlarged view of FIG. 14 (b), the all-line pattern (30) has the same image width as _{the background image line (21B) and the latent image image line (21A 0) constituting the phase modulation pattern (20).} A plurality of image lines (31) of (W) are arranged at the same pitch as the pitch (P1) in which the background image line (21B) and the latent image image line (21A _{0) are arranged.} The light transmissivity of the base material (3) forming the universal pattern (30) is the phase modulation pattern (20) when observed overlaid on the base material (2) on which the phase modulation pattern (20) is formed. ) Can be seen through, and if the phase modulation pattern (20) can be seen through, it may be colored, but the base material (3) forming the universal pattern (30) is preferably a transparent film. Or a polymer substrate is good. The light-transmitting base material (3) shown in FIG. 14 (b) on which the perimeter pattern (30) is formed is generally called a perimeter filter.

(effect)
The effect of the phase modulation pattern (20) of the present invention will be described with reference to FIG. FIG. 15 (a) shows the phase modulation pattern (20) of the present invention, and FIG. 15 (b) shows the conventional phase modulation multi-line pattern (110) for comparison. As shown in FIG. 15A, in the phase modulation pattern (20) of the present invention, the first latent image line (21A ₁ ) and the second latent image line (21A 1) are formed at the boundary between the latent image portion (20A) and the background portion (20B). By providing the latent image image line (21A ₂ ) of the above, it is possible to improve the concealment property of the pattern of the latent image. Further, when the base material (2) on which the phase modulation pattern (20) is formed and the base material (3) on which the perimeter pattern (30) is formed are superposed and observed, as shown in FIG. 15 (c), the latent pattern is observed. The number "1", which is the pattern of the image pattern (11), can be visually recognized.

In the phase modulation pattern (20) of the present invention, an example in which the design of the latent image pattern (11) is the number "1" shown in FIG. 3 has been described, but it is adjacent according to the design (contour) of the latent image. Since the area (position) where the interval between the matching image lines becomes narrower and the area (position) where the interval becomes wider are different, the first latent image line (21A ₁ ) and the second latent image are appropriately arranged according to the pattern of the latent image. An image line (21A ₂ ) may be provided. For example, as shown in FIG. 16, the design of the latent image pattern (11) is a "doughnut shape", and the image lines constituting the latent image portion (20A) are shifted in the first direction (V1). When arranged, the latent image portion (20A) in the area surrounded by the broken line is an area in which the distance between adjacent image lines is shorter than a predetermined pitch, so that the first latent image lines shown in FIGS. 6 to 9 are shown. (21A ₁ ) may be provided as appropriate. Further, since the area surrounded by the dotted line shown in FIG. 16 is an area in which the distance between adjacent image lines is longer than a predetermined pitch, the second latent image lines (21A ₂ ) shown in FIGS. 11 to 13 are shown. It may be provided as appropriate.

In the present embodiment, an example in which the image lines constituting the latent image portion (20A) are arranged so as to be displaced in the first direction (V1) has been described, but the image is shifted in the direction opposite to the first direction (V1). when placed Te, since the phase modulation pattern, replaced a region to be the region and a blank to be darkly, the first latent image of image line width (W _B) is less than image line width of the background image lines (21B) and streaking (21A _1), it may be arranged by replacing the position where the image line width of the background picture line (21B) _{(W B)} a second latent image streak larger image line width (21A _2).

Further, in the present embodiment, the phase modulation pattern (20) has a first latent image line (21A ₁ ) and a second latent image line at the boundary portion between the latent image portion (20A) and the background portion (20B). Although the _{configuration in which (21A 2} ) is provided has been described, a configuration in which one of the first latent image line (21A ₁ ) and the second latent image line (21A ₂ ) is provided may be used.

_{In the above description, the configuration in which the first latent image line (21A 1} ) and the second latent image line (21A ₂ ) are provided at the boundary between the latent image portion (20A) and the background portion (20B) has been described. _{However, as in the technique of Patent Document 1, the first latent image line (21A 1} ) of the present invention and the first latent image image line (21A 1) of the present invention are provided in the latent image portion of the phase-modulated universal line pattern in which the latent image can be visually recognized with a plurality of gradations. By providing the latent image line (21A ₂ ) of 2, the concealment of the latent image pattern can be improved, and hereinafter, the latent image pattern is visually recognized with a plurality of gradations (20). ) Will be described.

(Example of latent image pattern gradation)
In order to briefly explain the configuration of the phase modulation pattern (20), the latent image patterns are the "square pattern" shown in FIG. 17 (a) and the "square-shaped pattern" surrounding the "square pattern". The configuration in which the "design" is light and the "square-shaped pattern" is darkly visible will be described.

FIG. 17B is a diagram showing the configuration of the phase modulation pattern (20) showing the “square pattern” and the “square-shaped pattern” by providing the phase difference of all lines. The latent image portion representing the "square pattern" will be described as a reference numeral (20A ₁ ), and the latent image portion representing the "square symbol" will be described as a reference numeral (20A _2). Note that FIG. 17 (c) is a diagram showing the configuration of a conventional phase-modulated multi-line pattern (110 ″) for comparison with the phase-modulated pattern (20) of the present invention shown in FIG. 17 (b).

FIG. 18 is a partially enlarged view of a region surrounded by a solid line in the phase modulation pattern (20) of FIG. 17 (b). _{As shown in FIG. 18, the latent image portion (20A 1} ) representing the “quadrilateral pattern” is latent with a 1/4 pitch phase shift in the first direction (V1) with respect to the background image line (21B). A plurality of image lines (21A ₀ ') are arranged at a constant pitch (P1). _{Further, as shown in FIG. 18, the latent image portion (20A 2} ) showing the “square-shaped pattern” has a 1/2 pitch phase in the first direction (V1) with respect to the background image line (21B). A plurality of latent image lines (21A ₀ '') are arranged at a constant pitch (P1). Further, the line widths of the latent image line (21A ₀ ', 21A ₀ '') and the background line (21B) are the same. It should be noted that these configurations are the same as those of Patent Document 1, that is, the same as the phase-modulated multi-line pattern (110 ″) shown in FIG. 17 (c), and the phases differ depending on the gradation of the latent image pattern. It is a thing.

In the phase modulation pattern (20) shown in FIG. 17B _{, the first latent image image line is at the boundary between the latent image portion (20A 2} ) and the background portion (20B) adjacent to the first direction (V1). (21A ₁ ) is provided, but since the configuration is the same as the configuration described with reference to FIGS. 6 and 8, the description thereof will be omitted. Further, in the phase modulation pattern (20) shown in FIG. 17B, the latent image portion (20A ₂ ) is at the boundary portion with the background portion (20B) adjacent to the first direction (V1) in the direction opposite to the first direction (V1). A second latent image drawing line (21A ₂ ) is provided, but since the configuration is the same as the configuration described with reference to FIGS. 11 and 13, the description thereof will be omitted. Here, the configuration of the boundary portion between the _{latent image portion (20A 1} ) and the latent image portion (20A ₂ ) adjacent to the first direction (V1) will be described in detail.

FIG. 19 is an enlarged view showing a boundary portion between the _{latent image portion (20A 1} ) and the latent image portion (20A ₂ ) surrounded by the broken line in FIG. 17 (b). As shown in FIG. 17 (c), in the conventional phase-modulated multi-line pattern (110 ″), the image lines of the latent image portion arranged 1/2 pitch with respect to the image lines of the background portion and the background. The boundary portion of the image line of the latent image portion arranged with a phase shift of 1/4 pitch from the image line of the portion shall be a conspicuous blank area as in the area surrounded by the double line in FIG. 1 (b). Therefore, the phase modulation pattern (20) of the present invention includes a second latent image line (21A ₂ ) in the region. The second latent image line (21A ₂ ) has a density arranged in the same phase as the latent image constituent line (21a ₂ ) and the background line (21B) arranged in a phase different from that of the background image line (21B). become relaxed streak (21b ₂₎ is adjacent, image line width of the second latent image streak _{(21A 2) (W A2)} is greater than the image line width of the background picture line (21B) _{(W B)} .. _{Further, the distance (LA2-A0} ) between the center lines of the second latent image line (21A ₂ ) and the latent image line (21A ₀ '), and the second latent image line (21A ₂ ) and the latent image. streaked (21A ₀ '') the distance between the center line of the _{(L A0-A2)} is, Senzoga lines (21A ₀ 'pitch, 21A _0' ') and the background picture lines (21B) are arranged (P1 ) Greater. Further, the line width (Wa ₂ ) of the latent image constituent lines (21a ₂ ) constituting the second latent image line (21A ₂ ) shown in FIG. 19 is arranged in a phase different from that of the background image line (21B). been streaked width of the latent image streak (21A 0 _''), in this case, streaked width (W _a) smaller than, and background picture line (21B) disposed with different phase have been latent image streak ( 21A ₀ ') of the image line width _(W a), is greater than 1/2 of this case, streaked width _{(W a).} In the second latent image picture line shown in FIG. 19 (21A _2), image line width of the latent image configuration streak (21a ₂₎ (Wa ₂₎ is streaked width of the background image line (21B) (W _B) there is shown an example in which a smaller configuration, image line width of the second latent image streak _{(21A 2) (W A2)} is, image line width of the background picture lines _{(W B)} and Senzoga line _{(21A 0 ', 21A 0'} ') is greater than the image line width of _{(W a),} the latent image constituted streaked streaked width (21a ₂₎ (Wa ₂₎ is, the field of the background picture line (21B) the line width _{(W B)} and the latent image streak _{(21A 0 ', 21A 0'} ') may be the same size as the image line width _{(W a)} of.

According to the configuration shown in FIG. 19, the non-image portion between the _{latent image portion (20A 1} ) and the latent image portion (20A ₂ ) is smaller than that of the conventional phase-modulated multi-line pattern (110 ″). It is possible to solve the problem that a part of the pattern of the latent image becomes blank and is conspicuously visually recognized.

Phase modulation pattern shown in FIG. 19 (20), an example has been described with one second latent image picture lines (21A _2), even if a plurality of second latent image picture lines (21A ₂₎ provided good. FIG. 20 shows an example in which three second latent image lines are provided, and from the second latent image line (21A ₂ ) having the _{configuration shown in FIG. 19, further, the latent image line (21A 0} '). during and between the latent image line between (21A ₀ ''), and the second latent image picture lines _{(21A 2} -1,21A 2 -2) is provided.

In the configuration shown in FIG. 20, image line width of the second latent image streak _{(21A 2 -1) (W A2} -1) is larger than the image line width of the background picture line (21B) _{(W B),} the 2 of the latent image streak (21A ₂₎ image line width _{(W A2)} and the same or a second latent image streak (21A ₂₎ of image line width _{(W A2)} is smaller configuration. The second latent image streak _(21A 2 -1) constituting the latent image configuration streaked streaked width (21a ₂₎ (Wa _2), the second latent image picture lines (21A ₂₎ Configuration greater than the latent image configuration streaked streaked width (21a ₂₎ (Wa ₂₎ that, image line width of the density relaxation image lines constituting the second latent image picture lines _{(21A 2 -1) (21b 2} ) ( Wb ₂ ) is smaller than the line width (Wb ₂ ) of the density relaxation line (21b ₂ ) constituting the second latent image line (21A _2). That is, the latent image portion (20A) shown in FIG. 20 has a latent image constituent image line (21a ₂ ) and density relaxation _{from the second latent image image line (21A 2} ) to the latent image image line (21A _0''). The ratio of the image lines (21b ₂ ) is different, and the composition gradually approaches the composition of the _{latent image image line (21A 0'').}

Further, in the configuration shown in FIG. 20, image line width of the second latent image streak _{(21A 2 -2) (W A2} -2) is greater than the image line width of the background picture line (21B) _{(W B)} , image line width of the second latent image streak (21A ₂₎ image line width _{(W A2)} and the same or a second latent image streak _{(21A 2) (W A2)} is smaller configuration. The second latent image streak _(21A 2 -2) constitute a latent image structure streaked streaked width (21a ₂₎ (Wa _2), the second latent image picture lines (21A ₂₎ Configuration to the latent image configuration streak (21a ₂₎ smaller than the image line width (Wa ₂₎ of image line width of the density relaxation image lines constituting the second latent image picture lines _{(21A 2 -2) (21b 2} ) ( Wb ₂ ) is larger than the line width (Wb ₂ ) of the density relaxation line (21b ₂ ) constituting the second latent image line (21A _2). That is, the latent image unit (20A) shown in FIG. 20 has a latent image constituent image line (21a ₂ ) and a density relaxation _{image from the second latent image image line (21A 2} ) to the latent image image line (21A _0'). The ratio of the lines (21b ₂ ) is different, and the configuration gradually approaches the configuration of the latent image line (21A _0').

Further, in the configuration shown in FIG. 20, the distance between the center line of the second latent image streak adjacent in the first direction (V1) _(21A 2 -1) and latent image lines (21A ₀ '') ( L _A0- L _A2), the second latent image streak (21A ₂₎ and a second latent image streak (distance between the center lines of _{21A 2 -1) (L A2-} A2), a second latent image streaked _(21A 2 -2) and the second latent image streak (21A ₂₎ of the distance between the center line _{(L A2-A2)} and latent image lines (21A ₀ ') and a second latent image streak the distance between the center lines of _{(21A 2 -2) (L A2} -A0) are Senzoga lines _{(21A 0 ', 21A 0'} ') than the pitch (P1) of and background picture lines (21B) are arranged big.

Described above, the latent image portion of the configuration shown in FIG. 20 with the three second latent image streak _{(21A 2, 21A 2 -1,21A 2} -2) (20A) is that the structure described in FIG. 19 On the other hand, since the degree of change in the width of the image line is gradual, the configuration is preferable because it has a high effect of concealing the pattern of the latent image. Further, in FIG. 20, an example has been described of the three second latent image streak _{(21A 2, 21A 2 -1,21A 2} -2) latent image portion having the (20A), further, many of the 2 latent image lines may be provided.

FIG. 21 is an enlarged view showing a boundary portion between the _{latent image portion (20A 1} ) and the latent image portion (20A ₂ ) surrounded by the double line of FIG. 17 (b). As shown in FIG. 17 (c), in the conventional phase modulation universal line pattern (110 ″), the latent image portion (“square-shaped”” arranged with a deviation of 1/2 pitch from the image line of the background portion. The boundary between the image line of the area corresponding to (the area corresponding to) and the image line of the latent image part (area corresponding to the “square”) arranged with a phase shift of 1/4 pitch from the image line of the background part is shown in FIG. Since it is a region that is visually recognized as a dark color like the region surrounded by the broken line in b), the phase modulation pattern (20) of the present invention has the first latent image line (21A) in the region. ₁ ) is provided.

The first latent image line (21A ₁ ) has a density arranged in the same phase as the latent image constituent line (21a ₁ ) and the background line (21B) arranged in a phase different from that of the background image line (21B). become relaxed streak (21b ₁₎ is adjacent, image line width of the first latent image streak _{(21A 1) (W A1)} is streaked width of the background image line (21B) _{(W B)} is less than .. _{Further, the distance (LA0-A1} ) between the center lines of the first latent image line (21A ₁ ) and the latent image line (21A ₀ '), and the first latent image line (21A ₁ ) and the latent image. streaked (21A ₀ '') the distance between the center line of the _{(L A1-A0)} are Senzoga lines (21A ₀ 'pitch, 21A _0' ') and the background picture lines (21B) are arranged (P1 ) Less than.

According to the configuration shown in FIG. 21, the non-image portion between the _{latent image portion (20A 1} ) and the latent image portion (20A ₂ ) is larger than that of the conventional phase-modulated multi-line pattern (110 ″). It is possible to solve the problem of being visually recognized in a dark color.

Phase modulation pattern shown in FIG. 21 (20), an example has been described with one of the first latent image picture lines (21A _1), even if a plurality of first latent image picture lines (21A ₁₎ provided good. FIG. 22 shows an example in which three first latent image lines are provided, and from the first latent image line (21A ₁ ) having the _{configuration shown in FIG. 21, further, the latent image line (21A 0} '). during and between the latent image line between (21A ₀ ''), and the first latent image picture lines _{(21A 1} -1,21A 1 -2) is provided.

In the configuration shown in FIG. 22, image line width of the first latent image streak _{(21A 1 -1) (W A1} -1) is smaller than the image line width of the background picture line (21B) _{(W B),} the larger image line width _{(W A1)} of the first latent image streak (21A ₁₎ of image line width _{(W A1)} with the same or the first latent image streak (21A _1). Further, image line width of the first latent image streak _(21A 1 -1) constituting the latent image configuration streak (21a ₁₎ (Wa _1), the first latent image picture lines (21A ₁₎ Configuration smaller than the latent image configuration streak (21a ₁₎ of the image line width (Wa ₁₎ to, image line width of the density relaxation image lines constituting the first latent image picture lines _{(21A 1 -1) (21b 1} ) ( Wb ₁ ) is larger than the line width (Wb ₁ ) of the density relaxation line (21b ₁ ) constituting the first latent image line (21A _1). That is, the latent image portion (20A) shown in FIG. 22 has a latent image constituent image line (21a ₁ ) and a density relaxation _{image from the first latent image image line (21A 1} ) to the latent image image line (21A _0'). The ratio of the lines (21b ₁ ) is different, and the composition gradually approaches the composition of the latent image line (21A _0').

Further, in the configuration shown in FIG. 22, image line width of the first latent image streak _{(21A 1 -2) (W A1} -2) is smaller than the image line width of the background picture line (21B) _{(W B)} , larger image line width of the first latent image streak (21A ₁₎ of image line width _{(W A1)} with the same or the first latent image streak _{(21A 1) (W A1)} . Further, image line width of the first latent image streak _(21A 1 -2) constitute a latent image structure streak (21a ₁₎ (Wa _1), the first latent image picture lines (21A ₁₎ Configuration _{The image width (21b 1} ) of the density relaxation line (21b 1) that is larger than the image width (Wa ₁ ) of the latent image constituent image line (21a ₁ ) and constitutes the first latent image image line (21A _1-2). Wb ₁ ) is smaller than the line width (Wb ₁ ) of the density relaxation line (21b ₁ ) constituting the first latent image line (21A _1). That is, the latent image portion (20A) shown in FIG. 22 has a latent image constituent image line (21a ₁ ) and density relaxation _{from the first latent image image line (21A 1} ) to the latent image image line (21A _0''). The ratio of the image lines (21b ₁ ) is different, and the composition gradually approaches the composition of the _{latent image image line (21A 0'').}

Further, in the configuration shown in FIG. 22, the distance between the center line of the first latent image streak adjacent in the first direction (V1) _(21A 1 -1) and the latent image line (21A ₀ ') (L _A0-A1), a first latent image streak (21A ₁₎ and the first latent image streak (distance between the center lines of _{21A 1 -1) (L A1-} A1), a first latent image streak _{The distance (LA1-A1} ) between the center lines of (21A _1-2 ) and the first latent image line (21A ₁ ), the latent image line (21A ₀ ''), and the first latent image line (21A 0''). 21A ₁ -2) distance between the center line of the _(L A1- _{L A0)} is Senzoga lines _{(21A 0 ', 21A 0'} ') and than the pitch (P1) of the background picture lines (21B) are arranged small.

Described above, the three first latent image streak _{(21A 1, 21A 1 -1,21A 1} -2) latent image portion of the configuration shown in FIG. 22 having a (20A) is that the structure described in FIG. 21 On the other hand, since the degree of change in the width of the image line is gradual, the configuration is preferable because it has a high effect of concealing the pattern of the latent image. Further, in FIG. 22, an example has been described in the three first latent image streak _{(21A 1, 21A 1 -1,21A 1} -2) latent image portion having the (20A), further, many of the The latent image line of 1 may be provided.

Here, the phase modulation pattern (20) shown in FIGS. 18 to 22 has been described as a configuration of a latent image pattern that can be visually recognized with two shades shown in FIG. 17, but a latent image pattern having a plurality of shades is further described. It is also possible to form. In the latent image unit (20A), if the phases of adjacent lines with respect to the background image line (21B) are different and a blank is conspicuous, the second latent image line (21A ₂ ) shown in FIGS. 19 and 20. Should be used. Further, in the latent image portion (20A), if the phases of the adjacent strokes with respect to the background stroke (21B) are different, the non-image portion becomes smaller, and the dark color is conspicuous, it is shown in FIGS. 21 and 22. The first latent image line (21A ₁ ) may be used. Further, image line width of the first latent image streak _{(21A 1) (W A1)} , image line width of the first latent image streak (21A ₁₎ constituting a latent image structure streak (21a ₁₎ ( Wa ₁₎ and the concentration relaxation streak (21b ₁₎ and image line width (Wb _1), image line width of the second latent image streak _{(21A 2) (W A2)} , the second latent image streak ( The _{image width (Wa 2} ) of the latent image constituent lines (21a ₂ ) and the image width (Wb ₂ ) of the density relaxation image (21b _{2 ) constituting the 21A 2} ) are arranged in the latent image unit (20A). It may be adjusted appropriately according to the phase difference of the created image lines.

Regarding the effect of the first embodiment, the phase modulation pattern (20) is formed on the base material (2), and the perimeter pattern (30) is formed on the light transmissive base material (3), and these are overlapped. Although the example in which the latent image pattern can be visually recognized has been described in the above section, another form in which the phase modulation pattern (20) and the perimeter pattern (30) are formed will be described.

(Front and back composition)
FIG. 23 is a latent image pattern forming body (1) in which a phase modulation pattern (20) is formed on one surface of the base material (2) and a perimeter pattern (30) is formed on the other surface. Similar to Document 1, the phase modulation pattern (20) and the universal pattern (30) formed on the front and back surfaces of the base material (2) are synthesized under transmitted light. The universal pattern (30) is composed of a plurality of image lines (31) having the configuration shown in FIG. 14 (b), and is a surface opposite to the surface on which the phase modulation pattern (20) is formed on the base material (2). Is formed in. Regarding the positional relationship between the phase modulation pattern (20) and the universal pattern (30) formed on the front and back of the base material (2), the image lines (31) constituting the universal pattern (30) are the phase modulation patterns (20). When formed in an arrangement that overlaps with the background image line (21B) constituting the above, the visibility of the latent image pattern is the highest, but it is possible to visually recognize the latent image pattern even if it is slightly deviated. In this form, the base material (2) is opaque to the extent that the perimeter pattern (30) cannot be visually recognized when observed from the phase modulation pattern (20) side under reflected light, and when observed with transmitted light. , A paper material or a resin material having a light transmittance enough to synthesize two patterns may be used.

FIG. 24 is a modification of the universal pattern (30) in the present invention, in which the image lines (32) having a color different from the image lines (31) are the same as the image lines (31) between the image lines (31). This is an example of a universal pattern (30) arranged at a pitch (P1). In this case, when observed under transmitted light, the phase modulation pattern (20) and the perennial pattern (30) are combined, and the latent image portion showing the number "1" and the background portion around it are the respective image lines. It can be visually recognized by the color (31, 32). Although FIG. 24 shows a configuration in which the universal pattern (30) is formed on the base material (2), the so-called ten thousand line pattern (30) is formed on the light-transmitting base material (3) shown in FIG. It may be a line filter configuration.

Further, as another form of the universal line pattern (30) of the present invention, the colored universal pattern described in Japanese Patent Application Laid-Open No. 2018-199323 can be used to enrich the color expression of the latent image pattern. The colored multi-line pattern (30') described in JP-A-2018-199323 constitutes a colored multi-line pattern (30') corresponding to the pattern of the latent image portion (20A) of the phase modulation pattern (20). The color of the stroke is different. Specifically, as shown in FIG. 25 (a), when the colored multi-line pattern (30') is observed under reflected light, the achromatic image lines are arranged at regular intervals (P1). Although it can be seen, as shown in the enlarged view of FIG. 25 (a), in the portion corresponding to the number "1", the complementary color-related image lines (31) and the image lines (32) are adjacent to each other, and "1". The part corresponding to the background of the numbers consists of achromatic strokes. When the latent image pattern forming body (1) in which the colored multi-line pattern (30') and the phase modulation pattern (20) shown in FIG. 25 (a) are formed is observed under transmitted light, the phase modulation pattern (20) and the color are colored. Due to the arrangement of the multi-line pattern (30'), the number "1" is visually recognized by the color of the stroke line (31) or the color of the stroke line (32), and the background of the number "1" is visually recognized as an achromatic color. Will be done.

In the colored universal line pattern described in JP-A-2018-199323, the picture line (31) shown in FIG. 25 (a) is composed of one of the complementary color combinations, and the picture line (32) is composed of one of the complementary color combinations. ) Is the remaining one of the complementary color combinations, and as shown in the enlarged view of FIG. 25 (b), the colors are partially different in the image line (31). You may. In that case, the color of the adjacent image line (32) is different for each part of the image line (31) composed of different colors. In the enlarged view of FIG. 25 (b), the image lines (31, 32) composed of different colors are shown in different patterns, but in reality, "blue" is shown according to the pattern of the latent image. The complementary color lines such as "and yellow" and "green and red" are adjacent to each other. In the colored multi-line pattern (30') shown in FIG. 25 (b), the color of the image line (31) or the image line (32) is visually recognized as a latent image pattern due to the overlapping arrangement of the phase modulation patterns (20). You can see the latent image pattern with rich colors.

FIG. 26A shows a latent image pattern forming body (1) in which a perimeter pattern (30), a concealing layer (40), and a phase modulation pattern (20) are laminated in this order on a base material (2). In the figure, the configuration of the universal pattern (30) and the phase modulation pattern (20) and the arrangement in which the image lines constituting each pattern overlap are as described above, and thus the description thereof will be omitted. In the latent image pattern forming body (1) shown in FIG. 26A, the concealing layer (40) has a universal pattern (30) below it when observed under reflected light from the phase modulation pattern (20) side. It is concealed and has light transmission so that the perimeter pattern (30) can be visually recognized under transmitted light. The concealing layer (40) is formed of a color material other than black for printing, for example, a general process CMY ink or white ink, and is provided so as to cover the perimeter pattern (30). The action of concealing the multi-line pattern (30) is higher as the print density of the concealing layer (40) is higher, and can be adjusted by the particle size of the pigment contained in the color material used and the thickness of the color material. Therefore, it may be appropriately adjusted so that the universal pattern (30) is concealed under the reflected light. In addition, in the case of the coloring material forming the concealing layer (40) described above, the all-line pattern (30) can be seen through under the transmitted light, and the effect of being synthesized with the phase modulation pattern (20) occurs, but it is black. Since the coloring material does not transmit light, it cannot be used as a material for forming the concealing layer (40). Further, the coloring material forming the concealing layer (40) does not affect the color of the latent image pattern visually recognized by observation under transmitted light, and therefore it is preferable to use white ink.

FIG. 26B is a diagram showing a latent image pattern forming body (1) having a different stacking order from the universal line pattern (30), the concealing layer (40), and the phase modulation pattern (20) shown in FIG. 26A. The phase modulation pattern (20), the concealing layer (40), and the universal pattern (30) are laminated in this order on the base material (2). The configuration of the universal pattern (30) and the phase modulation pattern (20) and the configuration of the concealing layer (40) are as described above, but in the configuration shown in FIG. 26 (b), the concealing layer (40) is , When observing from the perimeter pattern (30) side under reflected light, the phase modulation pattern (20) underneath is concealed, and the light transmission for visually recognizing the phase modulation pattern (20) under transmitted light is provided. Have.

The latent image pattern forming body (1) shown in FIGS. 26 (a) and 26 (b) is provided with a concealing layer (40), so that when observed under reflected light, the phase modulation pattern (20) and all lines Only one of the patterns (30) is visually recognized, and when observed under transmitted light, the phase modulation pattern (20) and the universal pattern (30) are combined and the latent image pattern can be visually recognized.

(Lenticular)
FIG. 27 shows a generally called lenticular in which the image line (31) constituting the universal pattern (30) is composed of a lens, and FIG. 27 (a) shows the universal pattern (30). ), FIG. 27 (b) shows a cross-sectional view taken along the line XX'of FIG. 27 (a). The image line (31) constituting the universal pattern (30) has a background image line (21B) and a latent image image line (21A ₀ ) forming the phase modulation pattern (20) in the second direction (V2). It is arranged in a universal line at the same pitch (P1) as the arranged pitch. Further, the image line width (W) is set to a size that allows one image line (31) to sample a phase modulation pattern (20) arranged in an area of one pitch (P1). Specifically, the sum of the image line width in the phase modulation pattern (20) shown in FIG. 11, image line width of the background picture line (21B) _{(W B)} the latent image streak (21A _{0) (W A)} It becomes. Further, the height (H) of the image line is appropriately adjusted according to the focal length when observing by superimposing it on the phase modulation pattern (20). The universal pattern (30) shown in FIG. 27 shows a state in which the image lines (31) are arranged apart from each other, but the image lines (31) are adjacent to each other and are integrated. It may be present, or a plurality of image lines (31) may be arranged apart from each other on the base layer to form an integrated structure. The universal pattern (30) shown in FIG. 27 may be an integrated configuration formed on the phase modulation pattern (20) formed on the base material (2), or may be the same as the configuration shown in FIG. A separation type in which the latent image pattern is visually recognized by superimposing the base material (3) having the perimeter pattern (30) on the base material (2) on which the phase modulation pattern (20) is formed may be used, but phase modulation When superimposing the perimeter pattern (30) on the pattern (20), the latent image pattern can be visually recognized by superimposing the second direction (V2) and the first direction (V1) in the same direction. can.

(Convex line)
FIG. 28 (a) is an example in which the image line (31) constituting the universal pattern (30) is composed of a convex image line, and FIG. 28 (b) is an X of FIG. 28 (a). FIG. 5 is a cross-sectional view taken along the line -X'. In the universal pattern (30) shown in FIG. 28, the convex image line (31) constitutes the phase modulation pattern (20) in the first direction (V1), and the background image (21B) and the latent image image. The lines (21A ₀ ) are arranged in a universal line at the same pitch (P1) as the arrangement. The convex image line (31) can be obtained by performing a known drawing process using a circular net or dandy roll in the process of manufacturing paper, or by laser processing the paper or polymer base material (2). It can also be formed by removing a part of the base material (2). Further, the convex image line (31) can be formed by performing intaglio printing, screen printing, or other printing on the base material (2).

In the cross-sectional view of FIG. 28 (b), a latent image line (21A ₀ ) and a latent image constituent line (21a ₁ ) are provided on one side surface of the apex (T) of the convex image line (31). When the base material (2) formed and the background image (21B) and the density relaxation image (21b ₁ ) are formed on the other side surface, the background image (21B) is observed from an oblique angle on one side surface. And the density relaxation image (21b ₁ ) becomes a blind spot of the convex image line (31) and cannot be visually recognized, and only the _{latent image image line (21A 0} ) and the latent image constituent image line (21a _{1) can be visually recognized.} The latent image pattern can be visually recognized. _{In this embodiment, a configuration in which the entire latent image line (21A 0} ) overlaps one side surface of the convex image line (31) shown in FIG. 28 and the entire background image line (21B) overlaps the other side surface is latent. Since the image pattern is highly visible, the width (W) of the convex image line (31) is such that the phase modulation patterns (20) arranged in the region of one pitch (P1) overlap. Is preferable. However, even if the latent image line (21A ₀ ) and the background image line (21B) do not overlap on the side surface of the convex image line (31), one image is formed by the convex image line (31). Since the line acts as a blind spot, the latent image pattern can be visually recognized. Further, when the convex image lines (31) and the image lines (21) forming the phase modulation pattern (20) slightly intersect and overlap, specifically, the intersecting convex image lines (31). Even if the angle between the image and the image line (21) forming the phase modulation pattern (20) is 3 ° or less, the latent image pattern can be visually recognized.

(image)
In the present invention, the phase modulation pattern (20) is formed on the screen by a liquid crystal display such as a PC, a smartphone, a mobile phone, or an organic EL display, in addition to the configuration formed by printing on the above-mentioned base material (2). The configuration may be displayed. In this case, the phase modulation pattern (20) is composed of RGB light, which is the three primary colors of light, and can be expressed in any color depending on the RGB light and the intensity of those lights. Further, the universal pattern (30) may have the configuration of the universal filter described in paragraph (0066), or may be an arbitrary color depending on the RGB light and the intensity of those lights, as in the phase modulation pattern (20). The configuration expressed by may be used. If the universal pattern (30) has a universal filter configuration, the latent image pattern can be visually recognized by superimposing the universal filter on the screen displaying the phase modulation pattern (20).

Further, when the phase modulation pattern (20) is configured by RGB light and displayed on the display, the RGB image of the phase modulation pattern (20) is displayed by an image processing software such as Photoshop (registered trademark). By superimposing the RGB images corresponding to the line pattern (30), the latent image pattern can be visually recognized. Further, as a method of displaying the latent image pattern represented by the phase modulation pattern (20), it is also possible to partially add or subtract the image of the phase modulation pattern (20), which is described in Photoshop (registered trademark). The image processing function may be used, or a dedicated software that only performs the processing of displaying the latent image pattern may be used.

(Second Embodiment)
The second embodiment is the latent image pattern described in Japanese Patent Application Laid-Open No. 2018-220872, wherein the first latent image line (21A ₁ ) and the second latent image line (21A ₂ ) of the present invention are used. It is a phase modulation pattern (20) having a structure. Here, the latent image pattern described in Japanese Patent Application Laid-Open No. 2018-220872 will be described with reference to FIG. 29.

FIG. 29 (a) is a diagram showing the configuration of the phase-modulated multi-line pattern (120) described in Japanese Patent Application Laid-Open No. 2018-220872, and the phase-modulated multi-line pattern (120) is an enlargement of FIG. 29 (a). As shown in the figure, in the 10,000 lines in which the colored image lines are arranged in the first direction (V1) at a constant pitch (P), the phases are partially different, so that the latent number "1" is displayed. It is divided into an image part (120A) and a background part (120B). As shown in the enlarged view of FIG. 29 (a), the phase-modulated multi-line pattern (120) is characterized in that the colors of the image lines are different with the center line of the image lines constituting the latent image portion (120A) as a boundary. The lines of different colors (121A ₁ , 121A ₂ ) have a complementary color relationship. Further, the image line (121B) constituting the background portion (120B) is an achromatic color which is a mixed color of _{the complementary color related image lines (121A 1} , 121A _2). Therefore, since the latent image portion (120A) and the background portion (120B) have the same achromatic color, the image lines constituting the latent image portion (120A) and the background portion (120B) when observed under reflected light. I can't see the difference in color.

A special latent image pattern forming body in which a phase-modulated multi-line pattern (120) and a multi-line pattern (not shown) corresponding to the phase-modulated multi-line pattern (120) shown in FIG. 29 (a) is formed is under transmitted light. When observed, the number "1" is visually _{recognized in the color of the image line (121A 1} ) or the color of the image line (121A ₂ ) due to the phase-modulated perimeter pattern (120) and the arrangement of the perimeter pattern. As shown in the enlarged view of FIG. 29 (b), the phase modulation universal line pattern (120) described in Japanese Patent Application No. 2018-220872 is partially colored _{in the image line (121A 1).} It may be different. In that case, the color of the adjacent image line (121A _{2 ) is different for each part of the image line (121A 1} ) composed of different colors, and the colors of each part of the adjacent image line have a complementary color relationship. There is. In the phase-modulated multi-line pattern (120) shown in FIG. 29 (b), _{the color of the image line (121A 1} ) or the image line (121A ₂ ) can be visually recognized as a latent image pattern due to the overlapping arrangement of the multi-line patterns. It is possible to visually recognize the colorful latent image pattern.

Subsequently, in the phase modulation pattern (20) of the present invention, a configuration combining the configurations of the phase modulation universal pattern (120) of Japanese Patent Application Laid-Open No. 2018-220872 will be described. _{As an example, the configuration including the first latent image line (21A 1} ) shown in FIG. 6 will be described with reference to FIG. 30.

FIG. 30 is for solving the problem that the pattern of the latent image is inferred when the interval between adjacent image lines is shorter than a predetermined pitch (period) in the conventional phase-modulated multi-line pattern (110). It is a partially enlarged view of the phase modulation pattern (20) including one 1st latent image line (21A _1). The phase modulation pattern (20) shown in FIG. 30 is based on the phase modulation pattern (20) having the configuration shown in FIG. 6, and is combined with the configuration of the phase modulation universal pattern (120) of Japanese Patent Application Laid-Open No. 2018-220872. It is a thing. In the second embodiment, the _{width and pitch of the first latent image line (21A 1} ), the latent image line (21A ₀ ), the background line (21B), and the first latent image line (21A 0). The distance between the center line of 21A ₁ ) and the adjacent image line and the distance of the non-image area are as described above, and thus the description thereof will be omitted.

As shown in FIG. 30, the phase modulation pattern (20) of the second embodiment is imaged at the first latent image line (21A ₁ ) and the latent image line (21A ₀ ) with the center line as a boundary. Lines with different colors and different colors have a complementary color relationship. In FIG. 30, regions composed of different colors of the first latent image line (21A ₁ ) and the latent image line (21A ₀ ) are shown in different patterns, but in reality, they are latent. Depending on the pattern of the image, complementary color lines such as "blue and yellow" and "green and red" are adjacent to each other. Further, in the configuration shown in FIG. 30, the background line (21B) is achromatic, and the two colors constituting _{the first latent image line (21A 1} ) and the latent image line (21A _{0) are mixed.} It is a color (achromatic color). According to the configuration shown in FIG. 30, the latent image portion (20A) and the background portion (20B) are observed under reflected light, similarly to the phase-modulated multi-line pattern (120) of Japanese Patent Application Laid-Open No. 2018-220872. It is visually recognized as the same achromatic color, and the difference in color between the image lines constituting the latent image portion (20A) and the background portion (20B) cannot be visually recognized. On the other hand, due to the arrangement in which the many-line pattern (30) overlaps, one of the colors constituting the complementary color of _{the first latent image line (21A 1} ) and the latent image line (21A _{0) is the latent image pattern.} Visible as a color.

FIG. 31 is for solving the problem that the pattern of the latent image is inferred when the interval between adjacent image lines is longer than a predetermined pitch (period) in the conventional phase-modulated multi-line pattern (110). It is a partially enlarged view of the phase modulation pattern (20) including one 2nd latent image line (21A _2). The phase modulation pattern (20) shown in FIG. 31 is based on the phase modulation pattern (20) having the configuration shown in FIG. 11, and is combined with the configuration of the phase modulation universal pattern (120) of Japanese Patent Application Laid-Open No. 2018-220872. It is a thing. In the second embodiment, the _{width and pitch of the second latent image line (21A 2} ), the latent image line (21A ₀ ), the background line (21B), and the second latent image line (21A 0). The distance between the center line of 21A ₂ ) and the adjacent image line and the distance of the non-image area are as described above, and thus the description thereof will be omitted.

Also in the second latent image drawing line (21A ₂ ), the colors of the drawing lines are different from the center line, and the drawing lines of different colors have a complementary color relationship. In FIG. 31, regions composed of different colors of the second latent image line (21A ₂ ) and the latent image line (21A ₀ ) are shown in different patterns, but in reality, they are latent. Depending on the pattern of the image, complementary color lines such as "blue and yellow" and "green and red" are adjacent to each other. Further, in the configuration shown in FIG. 31, the background line (21B) is achromatic, and the two colors constituting _{the second latent image line (21A 2} ) and the latent image line (21A _{0) are mixed.} It is a color (achromatic color). Even in the phase modulation pattern (20) shown in FIG. 31, the latent image portion (20A) and the background portion (20B) are visually recognized as the same achromatic color when observed under reflected light, and the latent image portion (20A) and the latent image portion (20A). Although the color difference between the image lines constituting the background portion (20B) cannot be visually recognized, the second latent image image line (21A ₂ ) and the latent image image line (21A 2) and the latent image image line (21A 2) due to the overlap of the ten thousand line patterns (30). One of the colors constituting the complementary color of 21A ₀ ) is visually recognized as the color of the latent image pattern.

_{30 and 31 have described the configuration in which one first} latent image image (21A 1) and one second latent image image (21A ₂ ) are provided, but the first latent image line (21A _{1) has been described.} ) And a plurality of second latent image lines (21A ₂ ), and in the phase modulation pattern (20) having a configuration showing two shades shown in FIG. 17, the latent image portion (20A) is similarly provided. It may be composed of complementary colors with the center line of the image line as a boundary.

Further, regarding the phase modulation pattern (20) of the second embodiment shown in FIG. 30, the first latent image line (21A ₁ ) is an example in which two different colors are used with the center line as a boundary. Similar to the configuration shown in FIG. 29 (b), if adjacent image lines satisfy the complementary color relationship, they may be partially formed in different colors (not shown). The same applies to _{the latent image line (21A 0} ) and the second latent image line (21A ₂ ).

(Third Embodiment)
In the third embodiment, an apparatus (M) for creating data for producing the phase modulation pattern (20) of the first embodiment and a method for creating the data will be described.

(Data creation device for phase modulation pattern)
FIG. 32 is a block diagram showing the configuration of the data creation device (M) for the phase modulation pattern, and the data creation device (M) for the phase modulation pattern shown in FIG. 32 is an input means (M1) and edited. It includes means (M2), output means (M3), display means (M4), communication interface (M5), and database (M6). The output means (M3) and the display means (M4) are not indispensable for creating data for a phase modulation pattern.

The input means (M1) is composed of an image input means (M1a) and an information input means (M1b), and the input of an arbitrary image in the image input means (M1a) is not particularly limited to a digital camera, a scanner, or the like. do not have. It is also possible to obtain images, texts and the like from a database server registered in advance by the database (M6) or the communication interface (M5).

On the other hand, the information input means (M1b) is an external database server input from a keyboard or the like, numerical information or images registered in the same personal computer as the database (M6), and input in advance by the communication interface (M5). Numerical information or images can be obtained from.

The editing means (M2) is composed of a grayscale conversion means (M2a), a vertical averaging processing means (M2b), and a phase modulation pattern generation means (M2c). The vertical averaging processing means (M2b) performs the vertical averaging processing of the image by the image, the numerical information, the critical value array image, etc. obtained from the input means (M1), the communication interface (M5) or the database (M6). This is done, and the phase modulation pattern generation means (M2c) generates an image having a phase modulation pattern. The grayscale conversion means (M2a), the vertical averaging processing means (M2b), and the phase modulation pattern generation means (M2c) are Photoshop (registered trademark) image processing software manufactured by Adobe (registered trademark). ) Is a program that performs the processing described below by combining the functions themselves and individual functions.

The output means (M3) is a printing device capable of printing an image from a computer such as a laser printer or an inkjet printer, and is not particularly limited. The display means (M4) is not particularly limited to a personal computer monitor, a dedicated monitor, or the like. The communication interface (M5) is not particularly limited to USB, RS-232C, IEEE1394, and the like.

(How to create data for phase modulation pattern)
Next, a method of creating data for a phase modulation pattern by the device (M) for creating data for a phase modulation pattern will be described with reference to FIG. 33. Regarding the third embodiment, a method of creating a phase modulation pattern (20) in which a latent image of a “circular” pattern is embedded will be described.

(Base image setting process)
The reference numeral (f1) shown in FIG. 33 is a step of setting the base image of the latent image symbol to be embedded in the phase modulation pattern (20) in the form of a grayscale image (hereinafter, referred to as “base image setting step (f1)”). Therefore, as the image input means (M1a), an image captured by a digital camera or an image registered in advance in the database (M6) is used. If the image used from the image input means (M1a) or the database (M6) is a grayscale image, it is set as the base image (51) as it is, and if it is an RGB image or a monochrome binary image, the grayscale conversion means ( It is converted into a grayscale image (8 bits) by M2a) and used as a base image (51).

FIG. 34 shows an example in which a monochrome binary image (50) registered in advance in the database (M6) is used as the base image setting step (f1), and the monochrome binary image (50) of FIG. 34 is shown. In, the "circular" symbol has a density data of "1", and the surrounding area has a density data of "0". FIG. 35 is a diagram showing a base image (51) converted into a grayscale image by the grayscale conversion means (M2a). In this case, the “circular” symbol includes the density data of “255”, and the surroundings thereof are surrounded by the density data of “255”. It is converted into a configuration including density data of "0".

(Vertical averaging process)
The reference numerals (f2) shown in FIG. 33 refer to the grayscale image (51) shown in FIG. This is a step of averaging the gray level (density) of pixels in the vertical direction at a multiple of the pitch (P1) of the background image) (hereinafter referred to as “vertical averaging processing step (f2)”). For this averaging, a known image processing technique such as spatial filtering may be used. For example, when the pitch (P1) of the images constituting the phase modulation pattern (20) is 16 pixels, the number of pixels averaged in the vertical averaging process (f2) is 32 pixels, which is shown in FIG. 35. By performing the averaging process on the grayscale image (51) every 32 pixels in the vertical direction, the averaging image (52) shown in FIG. 36 can be obtained. In the vertical averaging process (f2), the size in the horizontal direction is arbitrary and may be one pixel or a plurality of pixels.

(Gradation inversion processing process)
Reference numeral (f3) shown in FIG. 33 is a step of inverting the shading of the averaged image (52) whose density has been averaged by the vertical averaging processing step (f2) to create an inverted image (52') (hereinafter). , "Gradation reversal processing step (f3)"), which is processed by the phase modulation pattern generation means (M2c). As a result, the inverted image (52') shown in FIG. 37 is generated. The process of reversing the shading is, for example, in a monochrome binary image, a black image is converted into a white image, a white image is converted into a black image, and further, in a gray scale image. The dark black image is converted to a light black image, and the light black image is converted to a dark black image.

(First critical value array image conversion processing step, second critical value array image conversion processing step)
Reference numeral (f4) shown in FIG. 33 is a step of applying the first critical value array image to the averaged image (52) and converting it into a binary image (hereinafter, "first critical value array image conversion processing step (hereinafter," first critical value array image conversion processing step ". The reference numeral (f5) shown in FIG. 33 is a step of applying a second critical value array image to the inverted image (52') to convert the image into a binary image (hereinafter, “f4)”. This is a second critical value array image conversion processing step (f5) ”), and is processed by the phase modulation pattern generation means (M2c). Here, in order to explain in detail the first critical value array image conversion processing step (f4) and the second critical value array image conversion processing step (f5), the broken line of the averaged image (52) shown in FIG. The process of converting the region (16a) surrounded by the above and the region (17a) surrounded by the broken line of the inverted image (52') shown in FIG. 37 will be described.

FIG. 38A is an enlarged view of the region (16a) surrounded by the broken line of the averaged image (52) shown in FIG. 36, and is the first based on the density information of the predetermined region of the averaged image (52). The critical value array image of is applied to convert to the binary image shown in FIG. 38 (b). The predetermined area of the averaged image (52) is an area of 16 pixels corresponding to the pitch (P1) of the image lines constituting the phase modulation pattern (20) in the image shown in FIG. 38 (a). This means h), and in the image shown in FIG. 38 (a), the horizontal direction is arbitrary, but here, an example in which the area (i) for 8 pixels is used will be described.

In the present invention, the first critical value array image is a pattern for converting into a binary image according to the density information of a predetermined region of the averaged image (52) which is an image before conversion into a binary image. It is an image and is registered in the database (M6) in advance. Further, the first critical value array image converts a binary image into the phase of the latent image line and the latent image constituent line, and in FIG. 38 (b), the latent image line and the latent image constituent line. The region corresponding to the phase of is indicated by the reference numeral “A”, and the region corresponding to the phase of the background image and the density relaxation image is indicated by the reference numeral “B”. Further, the size of the first critical value array image is the same as the size of a predetermined region of the averaged image (52) that refers to the density information, and here, 16 pixels in the vertical direction and 16 pixels in the horizontal direction. It is a pattern image of 8 pixels.

By converting the averaged image (52) shown in FIG. 38 (a) into a binary image for each region having the same size as the first critical value array image, the first image shown in FIG. 38 (b) is converted. Binary image (18A) is obtained. By the process of applying the first critical value array image and converting it into a binary image, each of the first binary images (18A) shown in FIG. 38 (b) is an averaged image shown in FIG. 38 (a). The higher the density of the predetermined region in (52), the larger the area of the converted binary image is converted. Further, by the process of applying the first critical value array image and converting it into a binary image, the higher the density of the predetermined region of the averaged image (52) shown in FIG. The area is sequentially largely converted from the boundary between the region (A) corresponding to the phase of the latent image constituent image and the region (B) corresponding to the phase of the background image and the density relaxation image. The process of applying the critical value array image is performed using, for example, a custom pattern created in advance in the mode conversion processing function of Photoshop (registered trademark), which is image processing software manufactured by Adobe (registered trademark). be able to.

FIG. 38 (c) shows the first binary image (18A) converted into a binary image by applying the first critical value array image to the entire averaged image (52). The first binary image (18A) shown in 38 (b) is arranged in the region (18a1) surrounded by the broken line in FIG. 38 (c).

FIG. 39 (a) is an enlarged view of the region (17a) surrounded by the broken line of the inverted image (52') shown in FIG. 37, and is a second view based on the density information of the predetermined region of the inverted image (52'). The critical value array image of is applied to convert to the binary image shown in FIG. 39 (b). The predetermined region of the inverted image (52') is a region of 16 pixels corresponding to the pitch (P1) of the image lines constituting the phase modulation pattern (20) in the image shown in FIG. 39 (a). This means h), and in the image shown in FIG. 39 (a), the horizontal direction is arbitrary, but here, an example in which the area (i) for 8 pixels is used will be described.

In the present invention, the second critical value array image is a pattern for converting into a binary image according to the density information of a predetermined region of the inverted image (52') which is an image before conversion into a binary image. It is an image and is registered in the database (M6) in advance. Further, the second critical value array image converts the binary image into the phases of the background image and the density relaxation image, and in FIG. 39 (b), the phases of the latent image line and the latent image constituent image. The region corresponding to is indicated by the reference numeral “A”, and the region corresponding to the phase of the background image and the density relaxation image is indicated by the reference numeral “B”. The size of the second critical value array image is the same as the size of a predetermined region of the inverted image (52') that refers to the density information, and here, 16 pixels in the vertical direction and 16 pixels in the horizontal direction. It is a pattern image of 8 pixels.

The inverted image (52') shown in FIG. 39 (a) is converted into a binary image for each region having the same size as the second critical value array image, so that the second image shown in FIG. 39 (b) can be converted into a binary image. Binary image (18B) of. By the process of applying the second critical value array image and converting it into a binary image, each of the second binary images (18B) shown in FIG. 39 (b) is the inverted image shown in FIG. 39 (a). The higher the density of the predetermined region of 52'), the larger the area of the converted binary image is converted. Further, by the process of applying the second critical value array image to convert it into a binary image, the higher the density of the predetermined region of the inverted image (52') shown in FIG. The area is sequentially largely converted from the boundary between the region (A) corresponding to the phase of the latent image constituent image and the region (B) corresponding to the phase of the background image and the density relaxation image.

FIG. 39 (c) shows a second binary image (18B) converted into a binary image by applying a second critical value array image to the entire inverted image (52'). The second binary image (18B) shown in 39 (b) is arranged in the region (18b1) surrounded by the broken line in FIG. 39 (c).

(Composite processing)
Reference numeral (f6) shown in FIG. 33 is a step (18B) of synthesizing the first binary image (18A) and the second binary image (18B) obtained by the critical value array image conversion processing steps (f4, f5). Hereinafter, it is referred to as “synthesis processing step (f6)”), and as shown in FIG. 40 (a), the first binary image (18A) and the second binary image (18B) are combined. An image of the phase modulation pattern shown in FIG. 40 (b) is created. In addition, in FIG. 40 (a), the region (16a) surrounded by the broken line of the averaged image (52) shown in FIG. 36 and the region (17a) surrounded by the broken line of the inverted image (52') shown in FIG. 37 are critical. The process of synthesizing the first binary image (18A) and the second binary image (18B) converted by the value array image conversion processing step (f4, f5) is shown. The first binary image (18A) is a pixel corresponding to the phase of the latent image line and the latent image constituent image line, and the second binary image (18B) is the background image and the density relaxation image. It is a pixel corresponding to the phase, and when both pixels are combined, as shown in FIG. 40 (b), a pixel (B ₂₁ ) corresponding to the background image and a pixel corresponding to the first latent image line. (AB _{21 ), pixels (A 21} ) corresponding to the latent image line are generated.

FIG. 41 (a) shows a critical value array in which the region (16b) surrounded by the dotted line of the averaged image (52) shown in FIG. 36 and the region (17b) surrounded by the dotted line of the inverted image (52') shown in FIG. 37 are arranged. It shows the process of synthesizing the first binary image (18A) and the second binary image (18B) converted by the image conversion processing steps (f4, f5). As shown in FIG. 41 (a), when the first binary image (18A) and the second binary image (18B) are combined by the synthesis processing step (f6), as shown in FIG. 41 (b), Pixels corresponding to the latent image line (A ₂₁ ), pixels corresponding to the second latent image line (ab ₂₁ ), and pixels corresponding to the background image line (B ₂₁ ) are generated.

FIG. 42 shows an image (19) of a phase modulation pattern in which the first binary image (18A) shown in FIG. 38 (c) and the second binary image (18B) shown in FIG. 39 (c) are combined. In the figure, the background image, the first latent image line, and the pixels corresponding to the latent image line shown in FIG. 40 (b) are arranged in the region (19a) surrounded by the broken line shown in FIG. 42. There is. Further, the background image line, the second latent image line, and the pixels corresponding to the latent image line shown in FIG. 41B are arranged in the region (19b) surrounded by the dotted line shown in FIG. 42.

The data created by the synthesis processing step (f6) for synthesizing the first binary image (18A) and the second binary image (18B) may be stored in the database (M6), or may be displayed by means of display. It may be displayed on (M4), or may be printed on the base material (2) by the output means (M3).

The above is an indispensable step in the method of creating data for a phase modulation pattern of the present invention, but a process of averaging the grayscale image (51) in the horizontal direction may be performed, and the subsequent processes are similarly performed. When this is done, the difference between the boundaries between the latent image portion (20A) and the background portion (20B) that are in contact with the direction of the image line (21), in detail, the images having different phases in the latent image portion (20A) and the background portion (20B). The difference between the boundaries of the line (21) can be relaxed. The process of averaging the grayscale image (51) in the horizontal direction needs to be performed before the gradation inversion processing step (f3), and may be performed before the vertical averaging processing step (f2). However, it may be performed after the vertical averaging processing step (f2), and the pixels having a horizontal size to be averaged may be any plurality of pixels.

Hereinafter, examples of the latent image pattern expression structure specifically produced will be described in detail according to the embodiment for carrying out the above-mentioned invention, but the present invention is not limited to this example.

(Example 1)
In the first embodiment, a phase modulation pattern (20) in which a latent image of the “circular” pattern shown in FIG. 42 is embedded is created by the method for creating data for the phase modulation pattern described in the third embodiment. The image pattern forming body (1) will be described. Further, in the latent image pattern forming body (1) of the first embodiment, as shown in FIG. 23, a phase modulation pattern (20) is formed on one surface of the base material (2), and the other side of the base material (2) is formed. A configuration in which a universal pattern (30) is formed on the surface of the surface will be described.

First, as the base image setting step (f1), a grayscale image showing the “circular” pattern shown in FIG. 35 was read from the database (M6) and set as the base image (51). The image size of the base image (51) is an image of 760 pixels × 760 pixels, the density of the “circular” pattern is “255”, and the density around it is “0”.

Next, as a vertical averaging processing step (f2), the densities of the base image (51) shown in FIG. 35 are averaged for each of 152 pixels in the vertical direction and 152 pixels in the horizontal direction, and the averaging image (52) shown in FIG. ) Was generated. The vertical averaging processing step (f2) was performed using the blurring function of Photoshop (registered trademark), which is image processing software manufactured by Adobe (registered trademark).

Next, as the gradation inversion processing step (f3), the shade of the averaged image (52) shown in FIG. 36 was inverted to generate the inverted image (52') shown in FIG. 37. The gradation inversion processing step (f3) was performed using the gradation inversion function of Photoshop (registered trademark), which is image processing software manufactured by Adobe (registered trademark).

Next, as the first critical value array image conversion processing step (f4), the first critical value array image is generated for each predetermined region (76 pixels in the vertical direction x 38 pixels in the horizontal direction) of the averaged image (52). The application produced a first binary image (18A) shown in FIG. 38 (c). The process of applying the first critical value array image is the first critical value array image created in advance in the mode conversion processing function of Photoshop (registered trademark), which is an image processing software manufactured by Adobe (registered trademark). It was converted into a binary image using the custom pattern.

Next, as a second critical value array image conversion processing step (f5), a second critical value array image is generated for each predetermined region (76 pixels in the vertical direction x 38 pixels in the horizontal direction) of the inverted image (52'). The application produced a second binary image (18B) shown in FIG. 39 (c). In the process of applying the second critical value array image, a custom pattern which is a second critical value array image created in advance is used in the same processing function as the first critical value array image conversion process (f4). It was converted into a binary image using.

Next, as the synthesis processing step (f6), the first binary image (18A) shown in FIG. 38 (c) and the second binary image (18B) shown in FIG. 39 (c) are combined to form a phase. Data (19) for the modulation pattern was generated.

In order to produce the latent image pattern forming body (1), the data (19) is printed on the base material (2) with a resolution of 4000 dpi by a laser printer (manufactured by Ricoh Co., Ltd., SPC740) to form the phase modulation pattern (20). did. Further, a perimeter pattern (30) was formed by a laser printer (manufactured by Ricoh Co., Ltd., SPC740) on the surface of the base material (2) opposite to the surface on which the phase modulation pattern (20) was formed. The all-line pattern (30) corresponds to the phase modulation pattern (20), and the image width (W) is 241.5 μm and the pitch (P1) is 483 mm.

When the produced latent image pattern forming body (1) is observed from the surface on which the phase modulation pattern (20) is formed, the phase modulation pattern (20) can be visually recognized as it is, and the concealing property of the "circular" pattern is improved. I was able to confirm that. Further, when observed under transmitted light, a "circular" latent image pattern could be visually recognized by being combined with the perimeter pattern (30).

(Example 2)
The second embodiment is a latent image pattern forming body (1) in which a latent image pattern with shading can be visually recognized, and the basic method of creating the data (19) for the phase modulation pattern is the same as that of the first embodiment. A part of the explanation is omitted. Further, in the latent image pattern forming body (1) of the second embodiment, the phase modulation pattern (20) is formed on the universal line pattern (30) composed of the convex image lines (31) shown in FIG. 28. The configuration will be described.

First, as the base image setting step (f1), an RGB image of a “human face” captured by a digital camera as an image input means (M1a) is used, converted into a grayscale image format, and the base image shown in FIG. 43. (51) was set. The grayscale conversion means (M2a) was performed using the mode conversion processing function of Photoshop (registered trademark), which is image processing software manufactured by Adobe (registered trademark). The image size of the base image (51) is an image of 768 pixels × 768 pixels, and is an image having a density of “0” to “255” depending on the shade of the “human face”.

Next, as a vertical averaging processing step (f2), the densities of the base image (51) shown in FIG. 43 are averaged at 32 pixels in the vertical direction and 1 pixel in the horizontal direction, and the averaging image shown in FIG. 44 ( 52) was generated. Further, as the gradation inversion processing step (f3), the shade of the averaged image (52) shown in FIG. 44 was inverted to generate the inverted image (52') shown in FIG. 45.

Next, as the first critical value array image conversion processing step (f4), the first critical value array image is generated for each predetermined region (16 pixels in the vertical direction x 1 pixel in the horizontal direction) of the averaged image (52). The application generated a first binary image (18A) shown in FIG. 46 (a). Further, as the second critical value array image conversion processing step (f5), the second critical value array image is applied to each predetermined region (16 pixels in the vertical direction x 1 pixel in the horizontal direction) of the inverted image (52'). Then, the second binary image (18B) shown in FIG. 46 (b) was generated.

Next, as the synthesis processing step (f6), the first binary image (18A) shown in FIG. 46 (a) and the second binary image (18B) shown in FIG. 46 (b) are combined and shown in FIG. The data (19) for the phase modulation pattern shown in 47 was generated.

In order to form the universal pattern (30) of Example 2, an inkjet printer (manufactured by Patternig JET Tritech) has a base material (2) having an image width (W) of 254 μm and a pitch (P1) of 508 μm. A plurality of convex image lines (31) are formed, and the generated data (19) for the phase modulation pattern is printed on the convex image lines (31) by a laser printer (manufactured by Ricoh Co., Ltd., SPC740). The phase modulation pattern (20) was formed.

When the produced latent image pattern forming body (1) is observed from the surface on which the phase modulation pattern (20) is formed, the phase modulation pattern (20) can be visually recognized as it is, and the concealment of the pattern of the "human face" is improved. I was able to confirm that. Further, when the latent image pattern forming body (1) is tilted and observed from the side where the phase modulation pattern (20) is formed, the latent image pattern (11) of the "human face" shown in FIG. 48 can be visually recognized. rice field.

1 Latent image pattern forming body 2 Base material (phase modulation pattern)
3 Base material (many line pattern)
10 Latent image pattern expression structure 11 Latent image pattern 13 Critical value array image (for averaging image)
14 Critical value array image (for inverted image)
18A First binary image 18B Second binary image 19 Image for phase modulation pattern 20 Phase modulation pattern 20A, 20A ₁ , 20A ₂ Latent image part 20B Background part 21 Colored image lines 21A ₀ , 21A ₀ ', 21A ₀ '' Senzoga lines _{21A 1, 21A} 1 -1,21A 1 -2 first latent image streak _{21A 2, 21A} 2 -1,21A 2 -2 second latent image streak _21a 1, 21a ₂ Latent image constituent images 21b ₁ , 21b ₂ Density relaxation image 21B Background image 300,000 line pattern 30'Colored universal pattern 31, 31 stroke (manline pattern)
40 Concealment layer 50 Monochrome binary image 51 Basic image 52 Averized image 52'Inverted image 1 million line pattern 110, 110', 110'' Conventional phase modulation 10,000 line pattern 120 Conventional phase modulation 10,000 line pattern 120A latent image Part 120B Background part 121A ₁ , 121A ₂ Complementary color-related image line M Data creation device for phase modulation pattern M1 Input means M1a Image input means M1b Information input means M2 Editing means M2a Grayscale conversion means M2b Vertical averaging means M2c Phase modulation pattern generation means M3 Output means M4 Display means M5 Communication interface M6 Database

Claims (11)

A phase modulation pattern in which a part of the ten thousand lines in which a plurality of colored lines are arranged at a constant pitch in the first direction is different in the first direction and is divided into a latent image portion and a background portion, and the phase. It is a latent image pattern expression structure in which a latent image pattern can be visually recognized by overlapping a plurality of line patterns in which a plurality of image lines corresponding to the modulation pattern are arranged at the same pitch as the colored image lines.
The latent image portion includes a latent image constituent image line arranged in a phase different from the image line constituting the background portion and a density relaxation image arranged in the same phase as at least a part of the image line constituting the background portion. It has a first latent image line and a second latent image line that are adjacent to each other.
The first latent image line has a narrower image width than the image width of the image lines constituting the background portion, and the distance between the center lines of the adjacent image lines in the first direction is constant. Placed smaller than the pitch of
The second latent image line has a wider image width than the image width of the image lines constituting the background portion, and the distance between the center lines of the adjacent image lines in the first direction is constant. A latent image pattern expression structure characterized in that it is arranged larger than the pitch of. A phase modulation pattern in which a part of the ten thousand lines in which a plurality of colored lines are arranged at a constant pitch in the first direction is different in the first direction and is divided into a latent image portion and a background portion, and the phase. It is a latent image pattern expression structure in which a latent image pattern can be visually recognized by overlapping a plurality of line patterns in which a plurality of image lines corresponding to the modulation pattern are arranged at the same pitch as the colored image lines.
The latent image portion includes a latent image constituent image line arranged in a phase different from the image line constituting the background portion and a density relaxation image arranged in the same phase as at least a part of the image line constituting the background portion. With at least one first latent image line consisting of adjacent
The first latent image line has a narrower image width than the image width of the image lines constituting the background portion, and the distance between the center lines of the adjacent image lines in the first direction is constant. A latent image pattern expression structure characterized in that it is arranged smaller than the pitch of. A phase modulation pattern in which a part of the ten thousand lines in which a plurality of colored lines are arranged at a constant pitch in the first direction is different in the first direction and is divided into a latent image portion and a background portion, and the phase. It is a latent image pattern expression structure in which a latent image pattern can be visually recognized by overlapping a plurality of line patterns in which a plurality of image lines corresponding to the modulation pattern are arranged at the same pitch as the colored image lines.
The latent image portion includes a latent image constituent image line arranged in a phase different from the image line constituting the background portion and a density relaxation image arranged in the same phase as at least a part of the image line constituting the background portion. With at least one second latent image line consisting of adjacent
The second latent image line has a wider image width than the image width of the image lines constituting the background portion, and the distance between the center lines of the adjacent image lines in the first direction is constant. A latent image pattern expression structure characterized in that it is arranged larger than the pitch of. The latent image portion is formed between the first latent image line and the latent image line constituting the latent image portion having the same image width as the image line constituting the background portion. The latent image constituent lines arranged in a phase different from the screens constituting the background portion and the density relaxation strokes arranged in the same phase as at least a part of the strokes constituting the background portion are adjacent to each other. A first latent image line, which is narrower than the image width of the image lines constituting the background portion and wider than the image width of the first latent image line, is further provided.
The image width of the latent image constituent image line constituting the first latent image image line is wider than the image width of the latent image constituent image line constituting the first latent image image line, and the first aa. The image width of the density-relaxed image constituting the latent image image is narrower than the image width of the density-relaxed image constituting the first latent image image.
The first or second aspect of the invention, wherein the distance between the center lines of the first latent image strokes and the adjacent strokes in the first direction is smaller than the constant pitch. Latent image pattern expression structure. The latent image portion is formed between the second latent image line and the latent image line constituting the latent image portion having the same image width as the image line constituting the background portion. The latent image constituent lines arranged in a phase different from the screens constituting the background portion and the density relaxation strokes arranged in the same phase as at least a part of the strokes constituting the background portion are adjacent to each other. A second latent image line having a width wider than the image width of the image lines constituting the background portion and a narrower width than the image width of the second latent image line is further provided.
The image width of the latent image constituent lines constituting the second latent image drawing line is wider than the image width of the latent image constituent lines constituting the second latent image drawing line, and the second a. The image width of the density-relaxed image constituting the latent image image is narrower than the image width of the density-relaxed image constituting the second latent image image.
The first or third aspect of the second a, wherein the distance between the center lines of the latent image lines adjacent to each other in the first direction is larger than the constant pitch. Latent image pattern expression structure. Claim 1 is characterized in that the width of the non-image portion between the first latent image line and the adjacent image line is substantially the same as the width of the first latent image line. The latent image pattern expression structure according to any one of 2 or 4. Claim 1 is characterized in that the width of the non-image portion between the second latent image line and the adjacent image line is substantially the same as the width of the second latent image line. 3. The latent image pattern expression structure according to any one of 3 or 5. The image line constituting the latent image portion is composed of complementary colors with the center line of the image line as a boundary, and the image line constituting the background portion is composed of an achromatic color. Item 8. The latent image pattern expression structure according to any one of Items 1 to 7. The phase modulation pattern according to claim 1 to 8 is formed on the base material.
The all-line pattern is
B) Colored image lines are arranged at the same constant pitch as the image lines constituting the phase modulation pattern, and the surface opposite to the surface on which the phase modulation pattern is formed on the base material. Formed in or
B) Convex lenses are arranged in a universal line shape at the same constant pitch as the image lines constituting the phase modulation pattern, and are formed so as to overlap the phase modulation pattern.
C) Colored image lines are arranged at the same constant pitch as the image lines constituting the phase modulation pattern.
A latent image pattern forming body characterized in that the phase modulation pattern is concealed under reflected light laminated on the phase modulation pattern and is formed on a concealing layer having light transmission. A latent image pattern forming body having the phase modulation pattern according to claim 1 to 8.
The all-line pattern is formed on the base material,
The all-line pattern is
D) Convex image lines having a color different from the color of the phase modulation pattern are arranged at the same constant pitch as the image lines constituting the phase modulation pattern, or
E) Colored image lines are arranged at the same constant pitch as the image lines constituting the phase modulation pattern.
In the case of the above d), the phase modulation pattern is formed on the all-line pattern, and in the case of the above-e), the all-line pattern is concealed under the reflected light laminated on the all-line pattern. A latent image pattern forming body characterized in that the phase modulation pattern is formed on a light-transmitting concealing layer. A method for creating data for a phase modulation pattern for producing the phase modulation pattern according to claim 1.
A base image setting step of setting a grayscale base image having a pattern represented by the latent image portion, and
A vertical averaging process for generating an averaging image by averaging the density of the set base image for each region corresponding to twice the pitch of the image lines arranged in the first direction. ,
A gradation inversion processing step of inverting the shading of the averaged image to generate an inverted image, and
A first critical value array that applies a first critical value array image to the averaged image to generate a first binary image for the latent image constituent image and the image forming the latent image portion. Image conversion process and
A second critical value array image conversion process in which a second critical value array image is applied to the inverted image to generate a second binary image for the density relaxation image and the image forming the background portion. Process and
A method for creating data for a phase modulation pattern, which comprises a synthesis processing step of synthesizing the first binary image and the second binary image to generate data for the phase modulation pattern. ..

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