JP2013052522A - Latent image printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent image printed matter which causes significant information to appear by making light incident and causes different significant information to appear by observing the printed matter while inclining the printed matter, in a field of noble printed matters such as bank notes, passports, negotiable securities, identification cards and traffic tickets as security printed matters requiring a forgery prevention effect.SOLUTION: There is provided the latent image printed matter the authenticity of which can be discriminated by the unselfconscious movement of the printed matter such a degree as to be unnoticed by a customer before user's eyes in face-to-face sales. A pitch of picture lines can be suppressed into a small value since swelling picture lines are configured only by arranging picture lines having the same widths in parallel with each other, a latent image picture having a higher resolution can be easily expressed and a printed area of printed picture can be decreased.

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matters that require anti-counterfeiting effects, the present invention makes significant information appear by making light incident. The present invention relates to a latent image printed matter in which different significant information appears when the printed matter is tilted and observed.

  With recent developments in digital devices such as scanners, printers, and color copiers, it has become possible to easily produce elaborate copies of precious printed matter. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by a printer or a copier are required. In addition, the anti-counterfeiting technology is desired to be a technology that can be easily distinguished by anyone without requiring special tools.

  One of the technologies capable of authenticating the authenticity is a latent image pattern formed by using the unevenness of the base material and the image line. This has the effect that the latent image appears when the printed material is tilted while the latent image is not visually recognized when facing the printed material. Elements for performing authenticity determination formed using such a three-dimensional structure of a base material or an image line have high forgery resistance because they cannot be counterfeited using a color copy or a printer.

  Already, the applicant has not recognized the image when observed from directly above, with the first image printed on the surface of the substrate and the transparent or translucent image printed on the substrate. Have applied for an invention related to an anti-counterfeit formed body that can recognize an image by changing an observation angle (see Patent Document 1 and Patent Document 2).

  In addition, the present applicant provides an area of glossy convex-shaped image lines arranged at a constant pitch with regions having different light reflectivities depending on the image lines arranged at the same pitch as the glossy convex-shaped image lines. The glossy image is obtained by the relative gloss difference between the two areas, a positive image area with a glossy convex line that strongly reflects light regularly when tilted at a certain angle, and a negative image area that does not strongly reflect light. An application has been filed for a latent image print that can appear (see Patent Document 3 and Patent Document 4).

  Further, the present applicant has provided a second difference in area ratio and phase on the first printed layer in which the line pattern is formed on the base material by the raised image line having the color flip-flop property. A latent image print formed by overlaying the print layers of the first latent image appears when light is incident, and a second latent image appears when the latent image print is tilted and observed. (See Patent Document 5).

Japanese Patent No. 4374446 Japanese Patent No. 3686953 JP 2007-106116 A JP 2009-90531 A JP 2011-5641 A

  The techniques described in Patent Document 1 and Patent Document 2 are configured to superimpose and form a raised image line on an image line printed on the surface of a substrate, and a latent image appears by tilting deeply. It is a technology that has an effect. However, in order to confirm the effect of the latent image appearing in the printed material, it was necessary to observe the printed material at an angle of at least 70 ° from an angle of 0 ° facing the printed material. This operation is a large operation, and it is easily known to surrounding people that the printed material is being checked for authenticity. In face-to-face sales, banknotes (printed matter) delivered as a price need to be quickly verified for authenticity while the customer is in front of them. The feelings of customers who know that they are are not good. From the above, it is not desirable that an unnaturally large operation accompanies true / false discrimination as in the techniques described in Patent Document 1 and Patent Document 2.

  In the techniques described in Patent Document 3 and Patent Document 4, a latent image appears when light is reflected on a printed matter, and when the observation angle is slightly changed from that state, the latent image is changed to a different latent image. It is a technology that has an effect of changing, and is a technology that exhibits an effect similar to a hologram in which a plurality of latent image images are changed under regular reflection light. However, as in holograms, the changing effect of the latent image technology using light reflection and the visibility thereof are often greatly influenced by the state of light in the observation environment. For example, in the case of observation under a multi-light source that is uniformly illuminated by a plurality of illuminations, the effect of changing is greatly reduced, and the visibility of a latent image is greatly reduced in observation in a dim environment. . It is not desirable that the effect of changing an image that should be a criterion for authenticity determination and the visibility of a latent image are greatly influenced by the presence or absence of light in the environment and the intensity.

  The technique of Patent Document 5 reflects light on the printed material in addition to the latent image (second latent image) that appears by tilting the printed material by 70 ° or more as in Patent Document 1 and Patent Document 2. This is a technique provided with another latent image (first latent image) that appears. This technology is a technology for authenticating the second latent image by tilting the printed material deeply when the first latent image cannot be visually recognized by reflecting light on the printed material. In normal face-to-face sales, it is sufficient to authenticate the first latent image, and the operation of reflecting light on the printed matter can be done with a very small natural action, so it is not noticed by the customer, and it does not hurt my heart. Absent. When the first latent image that appears when reflected by light is unclear and a counterfeit is suspected, the second latent image is checked by the second authenticity determination method. Thus, it is possible to perform more reliable authenticity determination. In addition, when the first latent image cannot be authenticated in a dim environment where there is no surrounding illumination, the second latent image can be authenticated and authenticity can be determined, and an authentication method corresponding to each scene Can also be selected.

  However, in the technique of Patent Document 5, only one image appears under specular reflection light, and a large number of latent image images are generated under specular reflection light as in the techniques and holograms of Patent Document 3 and Patent Document 4. It was impossible to make it appear. Since there are many technologies that make one latent image appear under specular reflection, it is not difficult to produce counterfeit products that only give the appearance effect of the first latent image using other technologies. If the reproducibility of the first latent image is high, the user who has obtained the counterfeit product can recognize the genuine product without confirming the second latent image by visually recognizing only the appearance effect of the first latent image. There was a concern to judge.

  In addition, in the technique disclosed in Patent Document 5, the first latent image and the second latent image need to be configured with a raised image line. Since the height of the image line has a certain correlation with the image line width, an image line width of a certain level or more is required to obtain a sufficient image line height. In addition to this, in order to form a second latent image having sufficient visibility, it is necessary to form a raised image line with a phase shifted by the image line width. Therefore, the first latent image and the second latent image can only express simple marks and characters, and even in that case, it is necessary to increase the line width and line pitch of the swelled line. was there. When the image pitch increases, there is a problem that if the configuration is such that the latent image can be authenticated at the same tilt angle, there is a problem that a higher image swell is required compared to a configuration where the image pitch is small, and eventually a large There was a problem that printing area and higher swell were required.

  The present invention is intended to solve the above-described problems, and is a printed matter that can determine authenticity in a casual movement that is not noticed by customers in front of the person in face-to-face sales. Since an image line is simply configured by arranging image lines of the same width in parallel, the image line pitch can be suppressed to a small value, and a latent image with high resolution can be easily expressed, and a printed image It is intended to provide a latent image printed matter capable of reducing the printing area.

  The latent image printed material in the present invention has a printed image on at least a part of the substrate, and the printed image has a color flip-flop property on the first image having a color different from the color of the substrate. Consists of a raised transparent or translucent second image with a third image formed transparent or translucent on the second image, the first image is The first significant information is configured by having a plurality of first image lines continuously arranged in the first direction at the first pitch, and having different phases of a part of the first image lines. The second image is divided into a positive image line group and a negative image line group, and the second image has a plurality of second image lines arranged continuously in the first direction at the first pitch. The images are a first transparent image, a second transparent image,..., An nth transparent image (n is an integer of 1 or more). If there is one or more and i) n = 1, the first transparent image has a plurality of first transparent image lines arranged in the first direction at the first pitch, and ii) n> In the case of 1, the first transparent image has a plurality of first transparent image lines arranged in the first direction at the first pitch, and the second transparent image has a second transparent image line. The nth transparent image is formed by arranging a plurality of nth transparent image lines in the first direction at the first pitch. , The first transparent image line, the second transparent image line,..., The nth transparent image line are not overlapped and the phase is shifted in the first direction. By changing the viewing angle, at least one of the first image, the first transparent image to the nth transparent image, and the first significant information can be visually recognized under a visible light source. And wherein the door.

  The latent image printed material according to the present invention is characterized in that the image area ratio of the positive image line group and the negative image line group is 25% or more and 75% or less.

  The latent image printed material according to the present invention is characterized in that the positive image line group and the negative image line group have the same image area ratio.

  In the latent image printed material according to the present invention, the first image line formed of the negative image line group and the first image line formed of the positive image line group have a first pitch of 2 in the first direction. The one-pitch phase is different.

  When the latent image printed material according to the present invention has two transparent images, the first transparent image line and the second transparent image line have a phase in each transparent image line that is a half pitch of the first pitch. In contrast, when there are n transparent images, the first transparent image line, the second transparent image line,..., The nth transparent image line has the phase of each transparent image line equal to n of the first pitch. It is characterized by one difference.

  In the latent image printed material according to the present invention, the first image further includes an information portion that constitutes second significant information, and the information portion has the information image line in the first direction at the first pitch. It is characterized by being arranged in a plurality without overlapping with the image line.

  The image area ratio of the information portion of the latent image printed material according to the present invention is 10% to 75% of the image area ratio of the positive image line group and the negative image line group.

  In the latent image printed matter of the present invention, the first transparent image in the state of being directly opposed (tilt angle 0 °) is changed to the first transparent by slightly changing the observation angle in the state of reflecting light (regular reflection angle). From the image to the nth transparent image, there is an effect that the first significant information appears in a deeply inclined state (an inclination angle of 70 ° or more). In the face-to-face sales, it is only necessary to confirm that light is reflected on the printed material and changed from the first transparent image to the nth transparent image. Since this movement is extremely small, it is possible to determine whether it is true or not in a casual movement that is not noticed by the customer in front of the eyes. Only when the first transparent image to the nth transparent image cannot be easily seen, that is, when the light source in the observation environment is not appropriate or the suspicion of being a counterfeit product occurs, What is necessary is just to confirm that one significant information can be visually recognized.

  The effect of changing the image from the first transparent image to the nth transparent image that occurs when the latent image print is specularly reflected is easily recognizable because a plurality of significant information changes sharply. Excellent discrimination.

  Moreover, it is difficult to imitate the conventional technique in which only one image appears under specular reflection light, and the forgery resistance is remarkably increased.

  In the latent image printed material of the present invention, the swelled image line is simply configured by arranging the image lines of the same width in parallel, and the technique described in Patent Document 5 is configured with the swelled image line. Since the latent image that appears in this case is configured by the phase shift of the image line in the first image that does not need to be raised, the pitch of the raised image line can be suppressed to a small value. Therefore, a latent image with high resolution can be easily expressed, and the print area of the print image can be reduced. In addition, since the line pitch can be designed to be narrow, even if the height of the raised line is low, a sufficient effect is exhibited. Therefore, the latent image printed matter of the present invention can form a latent image with a high resolution that could not be reproduced by the conventional technology, the printed image line is smaller, and the raised height of the image line is also lower. It can be formed.

It is a figure which shows the latent image printed matter in embodiment of this invention. It is a figure which shows the structure of the latent image printed matter in embodiment of this invention. It is a figure which shows the 1st image in embodiment of this invention. It is a figure which shows the 2nd image in embodiment of this invention. It is a figure which shows the 3rd image in embodiment of this invention. It is a figure which shows the overlap of the 1st image, 2nd image, and 3rd image in embodiment of this invention. It is a figure which shows the overlap of the image line of the 1st image and 2nd image in embodiment of this invention. It is a figure which shows the overlap of the image line of the 2nd image and 3rd image in embodiment of this invention. It is explanatory drawing of the effect of the latent image printed matter in embodiment of this invention. It is explanatory drawing of the effect that a transparent image changes by observation under regular reflection light in the latent image printed matter of embodiment of this invention. It is explanatory drawing of the effect that the 1st significant information appears when it inclines deeply and observes in the latent image printed matter of embodiment of this invention. It is a figure which shows an example of the 1st image of the latent image printed matter of this invention. It is a figure which shows an example of the 1st image of the latent image printed matter of this invention. It is a figure which shows the latent image printed matter in one Example of this invention. It is a figure which shows the structure of the latent image printed matter in one Example of this invention. It is a figure which shows the 1st image in one Example of this invention. It is a figure which shows the 2nd image in one Example of this invention. It is a figure which shows the 3rd image in one Example of this invention. It is explanatory drawing of the effect of the latent image printed matter of one Example of this invention. It is a figure which shows the latent image printed matter in one Example of this invention. It is a figure which shows the structure of the latent image printed matter in one Example of this invention. It is a figure which shows the positive image line group and negative image line group of the 1st image in one Example of this invention. It is a figure which shows the information part of the 1st image in one Example of this invention. It is a figure which shows the 1st image in one Example of this invention. It is a figure which shows the 2nd image in one Example of this invention. It is a figure which shows the 3rd image in one Example of this invention. It is explanatory drawing of the effect of the latent image printed matter of one Example of this invention. It is a figure which shows the latent image printed matter in one Example of this invention. It is a figure which shows the structure of the latent image printed matter in one Example of this invention. It is a figure which shows the 1st image in one Example of this invention. It is a figure which shows the 2nd image in one Example of this invention. It is a figure which shows the 3rd image in one Example of this invention. It is explanatory drawing of the effect of the latent image printed matter of one Example of this invention.

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

  FIG. 1 is a view showing a latent image printed matter (1) according to the present invention, and comprises a printed image (3) on a substrate (2). As long as the base material is a printable material, there is no problem even if any material such as paper, film or metal is used.

  FIG. 2 shows each image element constituting the print image (3). The print image (3) is formed by forming the second image (5) on the first image (4), and further forming the third image (6) on the second image (5). Made up. The first image (4) is formed with uniform gradation, and the positive image line group (7a) and the negative image line group (7a) representing the alphabet “NIPPON” which is the first significant information (positive) 7b). The third image (6) has a first transparent image (8a) and a second transparent image (8b). Each detailed structure is demonstrated in order.

  FIG. 3 shows a detailed drawing configuration diagram of the first image (4). The first image (4) is formed by arranging a plurality of first image lines (9) having an image line width (W1) continuously at a pitch (P1) in a first direction (direction S1 in the figure). The positive image line group in which the letters “NIPPON” of the alphabet, which is the first significant information, are expressed in positive and negative by changing the phase of the first image line (9) (shifting the phase). (7a) and negative stroke group (7b).

  The positive in the present invention means that the significant information itself is dark and the surrounding of one of the significant information is in a pale state, and the negative in the present invention is that in which the significant information itself is pale and the surrounding of one of the significant information is dark Point to.

  The phase shift in the first image line (9) is most preferably a half pitch of the pitch (P1) of the first image line (9). This is to keep the visibility of the first significant information in the observation angle region C described later high.

  As described above, the first image (4) included in the latent image printed material (1) described in the present embodiment is a positive image by shifting a part of the phase in the first image line (9). Since it is divided into the line group (7a) and the negative line group (7b), naturally, the first line (9) in the positive line group (7a) and the first line in the negative line group (7b). The line width of the line (9) is the same. For this reason, it is not easy to see that the character “NIPPON”, which is the first significant information, is included at a glance at the first image (4), but the first image in the positive line group (7a) Even if the line (9) and the first line (9) in the negative line group (7b) have different line widths, the first line (9) can be observed in the opposite direction (observation under diffuse reflected light). It is also possible to adopt a configuration in which the characters “NIPPON”, which is significant information, can be visually recognized.

  The area ratios of the positive image line group (7a) and the negative image line group (7b) are preferably formed in the range of 25% to 75%. The most desirable area ratio is 50%. When the image area ratio of the positive image line group (7a) and the negative image line group (7b) is 25% or less or 75% or more, the overlapping of the energetic image lines forming the second image (5) Depending on the method, the contrast of the first significant information appearing in the observation angle region C to be described later is low, which is not desirable because the possibility that it cannot be easily recognized increases. The line area ratio referred to in this specification refers to the ratio of the area of the line to a certain area.

  The first image (4) is formed using an ink having a color different from that of the substrate (2). The color can be any color, and in addition to using normal colored inks, using metallic inks such as gold or silver, or using glossy inks with high gloss, a higher changing effect can be obtained. Can do.

  The first image (4) does not need to be formed in a single color, and may be formed using a plurality of inks having different hues. For example, the positive image line group (7a) and the negative image line group (7b) may be formed with different hues. For example, one positive image line group (in one pitch described in the embodiment) ( The first image line (9) in 7a) and the first image line (9) in the negative image line group (7b) are composed of two or more lines in one pitch, and the two image lines have different hues. It may be formed. An example of forming the first image (4) with a plurality of hue lines will be described in detail in Example 3.

  The printing method for printing the first image (4) may be any method such as offset printing, letterpress printing, flexographic printing, gravure printing, intaglio printing, etc., but a swell that is too high is formed on the printed image line. In such a case, since the printing of the second image (5) to be subsequently superimposed may be adversely affected, a printing method that forms an excessively swelled image line is not preferable. Most preferred is offset printing, which can easily form a high-resolution first image (4). Further, there is no problem even if it is formed using a digital printing apparatus such as an ink jet printer or a laser printer.

  FIG. 4 shows a detailed drawing configuration diagram of the second image (5). The second image (5) is formed by the second image line (10) which is an image line having a bulge, and the second image line (10) having the image line width (W3) is the first image line (10). A plurality of lines are continuously arranged in the direction (direction S1 in the figure) at a pitch (P1).

  The second image (5) is desirably formed with a line area ratio of 50% or more and less than 100%. When the area ratio is less than 50%, the reflected light becomes extremely small, and the visibility of the transparent image in the observation angle region B described later becomes too low. Since the image lines (10) are in contact with each other and the ridge-shaped rise is lost, it is not desirable.

  The second image (5) is formed with a ridge-shaped image line that is raised using a transparent or translucent color flip-flop ink. When opaque ink is used, the first image (4) is concealed by the second image (5), and the visibility of the first significant information is reduced in observation of the observation angle region C described later. This is not preferable. Since the second image (5) needs to be raised, it can be formed by flexographic printing or gravure printing, but it should be formed by intaglio printing or screen printing that can easily form a raised image. Is more desirable.

  As for the rising of the image line of the second image (5), if it is constituted with an appropriate image line pitch, it will be effective if it is 2 μm. The maximum height is not particularly limited from the viewpoint of the effect, but it is desirable to keep it to 50 μm or less from the viewpoint of the friction resistance and distribution suitability of the printed matter.

  The color flip-flop property referred to in this specification is a property that the hue changes when specularly reflected, and is different from the light-and-dark flip-flop property that changes only the brightness and darkness that gloss ink and metal ink have. This is a property rich in color change during regular reflection.

  In recent years, a wide variety of pigments have been marketed as materials having this color flip-flop property. Typical examples of pigments currently on the market are iris pearl pigments, scaly mica pigments, scaly metal pigments. Glass flake pigments, cholesteric liquid crystal pigments and the like. An image line which is transparent or translucent and has color flip-flop properties can be formed by dispersing an appropriate amount of these pigments into ink and printing.

  In the present specification, the second image (5) is formed mainly using an iris pearl pigment. The image line formed including the iris color pearl pigment is colorless and transparent under diffuse reflection light, and has a characteristic of emitting an interference color having a specific hue only when regular reflection light is generated.

  When it is desired to provide high color flip-flop properties, it is desirable that pigments having color flip-flop properties are aligned and oriented on the surface of a swelled image line, and such a state is generally called leafing. As a method for obtaining an excellent leafing effect, for example, there is a method of imparting water repellency and oil repellency to a pigment as in the technique described in JP-A-2001-106937.

  FIG. 5 shows a detailed drawing configuration diagram of the third image (6). The number of latent images in the third image (6) is not particularly limited, but in the present embodiment, an example in which the number of transparent images n is 2 (n = 2) will be described. Note that the number n of transparent images may be one or more.

  The third image (6) includes a first transparent image (8a) representing the Japanese character “Japan” and a second transparent image (8b) representing the pattern “Sakura no Hana”. In the first transparent image (8a), a plurality of first transparent image lines (11a) having an image line width (W4) are continuously arranged at a pitch (P1) in the first direction (direction S1 in the drawing). The second transparent image (8b) is formed by continuously arranging the second transparent image line (11b) having the image line width (W5) at the pitch (P1) in the first direction (direction S1 in the figure). It consists of The line widths of the transparent lines constituting each transparent image need to be the same for each transparent image, but need not be the same for different transparent images. That is, in the description of the present embodiment, the image line width (W4) and the image line width (W5) are configured with the same width, but there is no problem even if they are different.

  The first transparent image line (11a) and the second transparent image line (11b) need to be arranged by shifting the phase of each transparent image line in the first direction (direction S1 in the figure). In this embodiment, the phase is shifted in the first direction by a half pitch of the pitch (P1).

  Although the specific reason will be described later, the optimum amount of phase shift is the number of transparent images unless the positional relationship of superposition of the second image (5) and the third image (6) is strictly controlled. Is 1/2 of the pitch (P1) is most preferable. When the number of transparent images is 3, 1/3 of the pitch (P1) is most desirable. When the number of transparent images is 4, the pitch is A quarter pitch of (P1) is most desirable. That is, when the number of transparent images is n, it is preferable to reduce the manufacturing difficulty by shifting the phase of the transparent image line in the first direction by 1 / n pitch of the pitch (P1). In that case, it is desirable that the line width of each transparent line is larger than the value obtained by subtracting the line width (W3) of the second line (10) from the pitch (P1).

  The third image (6) needs to be formed transparent or translucent. The term “translucent” as used in the present invention refers to a state in which the color is so small that it is visible, but the color is very light. Since a transparent image line cannot be visually observed and quality control of the image line is difficult, there is a case where the image line is slightly colored to make a translucent image line as a device for manufacturing.

  The color of the semi-transparent image line needs to have a hue different from the interference color emitted when the second image line (10) is regularly reflected. The hue different from the interference color emitted when the second image line (10) is specularly reflected is, for example, a red color other than gold when the second image line (10) is an image line emitting a gold interference color. It is a hue such as blue, green.

  If the second image line (10) is an image line that emits a gold interference color, and the third image (5) is composed of a hue of gold (yellow), Since the hue of the image line (10) matches the hue of the third image (6), the visibility of each transparent image appearing during regular reflection is extremely lowered, which is not desirable.

  Further, in order to improve the visibility of each transparent image appearing during regular reflection, the reflectance of each image line of the third image (6) is lower than the reflectance of the second image line (10). desirable.

  Moreover, it is desirable that the color of the translucent ink constituting the third image (6) is a color close to the hue of the first image (4) and has a light color density. This is to prevent the third image (6) from being visualized under diffuse reflected light.

  If a colored ink having a completely different hue from that of the first image (4) is used for the third image (6), it is necessary to drop it to an extremely light color density that is almost invisible. Is undesirable.

  From the above, when the third image (6) is composed of a semi-transparent ink, the ink has a hue different from the interference color emitted from the second image line (10) during regular reflection, the first image. It is desirable to have a color close to the hue of (4) and a light color density.

  In the embodiment, the first transparent image line (11a) and the second transparent image line (11b) are in close contact with each other in the first direction, but are slightly separated by providing a gap in the first direction. There is no problem even if it is in close proximity. When there is a gap between each transparent image line, when observed under specular reflection light, if the first transparent image (8a) is slightly tilted from the viewing angle when the first transparent image (8a) was viewed, the first transparent image Since the image (8a) disappears completely and the second transparent image (8b) appears at once when the observation angle is changed slightly from the disappeared angle, the change effect is felt to be higher. desirable.

  For the third image (6), as in the first image (4), the image line does not need to be raised, and any method such as offset printing, letterpress printing, flexographic printing, gravure printing, intaglio printing, screen printing, etc. is used. May be. Moreover, there is no problem even if it is formed using a digital printing device such as an ink jet printer or a laser printer. In addition, the second image line (10) constituting the second image (5) can be cut with a laser, or the color flip-flop can be lost by damaging the pigment only on the surface of the image line. However, it is possible to form a third image (6).

  In this case, it is necessary to change the wavelength of the laser to be used depending on the configuration of the second image line (10). For example, if the second image line (10) is transparent, a carbon dioxide laser with a wavelength of about 10 μm should be used. When a metal pigment, a pearl pigment, or the like is included, it is preferable to use a YAG or YVO4 laser having a wavelength of about 1 μm. That is, when the third image (6) is formed using a laser, it is desirable to use a laser having a wavelength close to the absorption wavelength of the second image line (10).

  FIG. 6 shows an explanatory diagram of superposition of the first image (4), the second image (5), and the third image (6). As described above, the image line constituting the first image (4), the image line constituting the second image (5), and the image line constituting the third image (6) are: All of them are arranged in the first direction, but the second image (5) is superimposed on the first image (4) so that the respective image lines are parallel to each other. A third image (6) is superimposed on the image to form the latent image print (1) of the present invention.

  FIG. 7 shows an example of overlapping of the image lines caused by the superposition of the first image (4) and the second image (5). FIG. 7B shows that the second image line (10) is the first image line (9) in the positive image line group (7a) and the first image line in the negative image line group (7b). FIG. 7C shows a state in which the second image line (10) is overlapped with the first image line (7b) in the negative image line group (7b). FIG. 7 (d) shows a state in which the second image line (10) is a positive image, as shown in FIG. 7 (d), which is more overlapped with the first image line (9) in the positive image line group (7a) than 9). FIG. 7E shows a state where the second line (10) is overlaid on the negative line group (7b). ) Overlaid only on the first image line (9). In either case, the latent image print (1) of the present invention can be formed, and a certain effect can be obtained. In FIG. 7C, when the overlapping ratio is reversed, that is, the second image line (10) is more negative than the first image line (9) in the positive image line group (7a). The same applies to the state where the first image line (9) in the group (7b) overlaps more.

  However, when the second image line (10) is not transparent but translucent and has a slightly light blocking property, as shown in FIGS. 7 (d) and 7 (e), In the state where the most extreme difference between whether or not the two lines overlap or does not overlap, one of the lines of the first image (4) and the line of the second line (10) are strong. The interference may cause the first significant information to be visualized under diffuse reflected light, which is not preferable when it is desired to make the first significant information invisible under diffuse reflected light. Only in this case, it is desirable to superimpose two images in a positional relationship as shown in FIG. 7 (a) or FIG. 7 (b).

  Next, FIG. 8 shows an example of overlapping of the image lines caused by the superposition of the second image (5) and the third image (6). FIG. 8B shows a state in which the first transparent image line (11a) and the second transparent image line (11b) are overlapped on the second image line (10) by substantially the same width. FIG. 8 (c) shows a state in which the first transparent image line (11a) more than the second transparent image line (11b) overlaps the second image line (10). FIG. 8 (d) shows a state in which only the first transparent image line (11a) is superimposed on the second image line (10), and FIG. Only the second transparent image line (11b) is overlaid on the second image line (10). 8C, when the overlapping ratio is reversed, that is, the second transparent line (11b) has more second transparent lines (11b) than the first transparent line (11a). The same is true for the state of being overlaid.

  Among these, the first transparent image line (11a) or the second transparent image line (11b) on the second image line (10) as shown in FIG. 8 (d) and FIG. 8 (e). In the state in which any of the above does not overlap, the transparent image that has not overlapped is not visualized under specular reflection light, so the overlapping state shown in FIGS. 8D and 8E was avoided. Is preferable. FIG. 8B shows the most desirable superposition state. On the other hand, as shown in the second transparent image line 11b in FIG. For example, since the transparent image constituted by the transparent image line is always visualized at any observation angle under regular reflection light, the effect required by the present invention can be obtained.

  In addition, when the number of transparent images is n, it is preferable to reduce the manufacturing difficulty level by shifting the phase of the transparent image line in the first direction by 1 / n pitch of the pitch (P1). In this case, it has been described above that the line width of each transparent line is preferably larger than the value obtained by subtracting the line width (W3) of the second line (10) from the pitch (P1). The reason will be described below.

  Since the transparent image line formed in the non-image area of the second image (5) where the second image line (10) does not exist is not visualized under specular reflection light, any transparent image is configured. A state where all the transparent image lines to be formed are formed in the non-image area of the second image (5) must be avoided.

  However, there is a high possibility that the second image (5) and the third image (6) are basically formed by different printing machines of different printing methods. In that case, it is usually difficult to perform precise printing between different printing presses, and the printing in the first direction of the second image (5) and the third image (6) is strictly matched. It's not easy.

  In view of such circumstances, when the number of transparent images is n, the phase of the transparent image line is shifted in the first direction by 1 / n pitch of the pitch (P1), and the image lines of each transparent image line When the width is larger than the value obtained by subtracting the line width of the second image line (10) from the pitch (P1), the second image (5) and the third image (6) are combined. Even if the image is greatly deviated in the first direction, the entire transparent image line is formed in the non-image area of the second image (5) in any transparent image in the third image (6). This is because the effect that the first to n-th transparent images always appear can be ensured with any inclination in the regular reflection light region.

  FIG. 9 shows the effect of the latent image print (1) of the present invention. FIG. 9 (a) shows the positional relationship among the light source (12), the latent image printed matter (1), and the observer's viewpoints (13a, 13b, 13c). FIG. 9 (b), FIG. 9 (c), FIG. (D) shows images that the viewer can visually recognize at the respective viewpoints (13a, 13b, 13c). In the description of the present embodiment, an example will be described in which light is incident on the printed matter at an angle of about 45 degrees from the light source (12).

  First, when the observer's viewpoint is at the viewpoint (13a), the angle of light incident from the light source (12) and the angle of light reflected from the printed matter (1) and reaching the viewpoint (13a) are greatly different. In this state, there is almost no specularly reflected light in the reflected light reaching the observer's viewpoint (13a), and diffusely reflected light is dominant. In this specification, this observation angle region is referred to as an observation angle region A. Note that the observation angle region A also exists on the opposite side across the observation angle region B described later.

  When the observer's viewpoint (13a) is present in the observation angle region A, the observer observes the first image (4) shown in FIG. 9B. In this case, the observed image is visually recognized by the color of the ink that formed the first image (4).

  Next, when the viewpoint of the observer is at the viewpoint (13b), the angle of the light incident from the light source (12) is the same as or close to the angle of the light reflected from the printed matter (1) and reaching the viewpoint (13b). Value. In this state, the proportion of specularly reflected light in the reflected light reaching the viewer's viewpoint (13b) is remarkably increased, the specularly reflected light is dominant, and the diffusely reflected light is extremely small. In this specification, this observation angle region is referred to as an observation angle region B.

  When there is an observer's viewpoint (13b) in the observation angle region B, the observer sees the first transparent image (8a) and the second transparent image (8b) shown in FIG. 9 (c). The The first transparent image (8a) and the second transparent image (8b) are changed by slightly changing the inclination of the latent image print (1).

  The color of the transparent image that appears in the observation angle region B is expressed by combining the colors of the first image (4), the second image (5), and the third image (6).

  For example, the first image (4) is formed with red ink, the second image (5) is formed with pearl ink that emits a gold interference color, and the third image (6) is formed with a translucent light red ink. In the first transparent image (8a), the letters “Japan” are red, and the surrounding white spots are visible in gold.

  For example, the first image (4) is formed with black ink, the second image (5) is formed with pearl ink that emits a gold interference color, and the third image (6) is formed with a translucent light gray ink. In the first transparent image (8a), the characters “Japan” are dark gray, and the surrounding white portions are viewed in gold. Further, for example, the first image (4) is formed with blue ink, the second image (5) is formed with pearl ink that emits a gold interference color, and the third image (6) is formed with a normal low gloss. In the first transparent image (8a), the characters “Japan” are visible in blue, and the surrounding white spots are visible in gold.

  As described above, in the transparent image, the region where the transparent image line of the third image (6) is formed (the black portion of the transparent image) is the color of the first image (4) and the third color. The other region is a composite color of the color of the image (6), and is represented by the interference color of the image line constituting the second image (5). As described above, in the observation angle region B, extremely rich color expression is possible.

  Next, when the viewpoint of the observer is the viewpoint (13c), the angle of the light incident from the light source (12) and the angle of the light reflected from the latent image print (1) and reaching the viewpoint (13c) are greatly different. Therefore, the diffuse reflected light is dominant as in the observation angle region A, and the color flip-flop property of the second image line (10) forming the second image (5) is lost.

  However, when the second image line (10) is observed from an extremely deep angle, the surface of the image line that is raised is greatly scattered and refracted by the pigment components contained in the material forming the image line group. As a result, the transparency of the image line is apparently lowered, and the image line that is transparent or translucent is changed to an opaque and slightly white color.

  Therefore, the second image line (10), which is transparent or translucent in the state of facing, is the observer who selects the image line group and the substrate forming the first image (4) in the observation at a deep angle. It functions as a wall that shields from the viewpoint (13c).

  From the above, the image line that forms the first image (4) in front of the second image line (10) that is raised is visible, and the image line that is behind the second image line (10) is A so-called shielding effect that becomes invisible occurs in the observation angle region C. In this specification, this observation angle region is referred to as an observation angle region C.

  When the viewpoint (13c) of the observer is present in the observation angle region C, the alphabet “NIPPON” characters as the first significant information shown in FIG. 9D are observed by the observer. Further, the second image line (10) with respect to the two image lines of the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b). Depending on whether the positive image group (7a) looks dark or the negative image group (7b) looks dark, as shown in FIG. 9 (d). Significant information may be visible in negatives or positive. In this case, the observed image is visually recognized by the shade of the color of the ink that formed the first image (4).

  In addition, when the first significant information is seen as a negative from the viewpoint (13c) of the observer, when the latent image printed matter (1) is observed upside down (in the opposite direction) in the S1 direction, the density is reversed. If the first significant information is seen from the observer's viewpoint (13c) in the positive direction, and the printed matter is viewed upside down in the first direction, the shade is reversed and the negative appears. A negative / positive reversal effect also occurs.

  The above is the effect of the latent image printed material (1) of the present invention. The specific principle of the effect will be described below.

  First, in the observation angle region A, the first image (4) is colored, while the second image (5) is transparent or translucent, and the third image (6) is transparent or translucent. Only the first image (4) is visually recognized.

  Further, in the observation angle region B, since the second image line (10) has a ridge-shaped bulge, the light is strongly reflected around a plane that is normal to the incident light. When the inclination of the latent image print (1) is changed with respect to the incident light, the plane that forms a normal line with the incident light changes. For example, as shown in FIG. 10 (b), when the side on the A side in the figure is tilted so as to approach the observer (13b), the incident light on the surface of the second image line (10) is strongly increased. The reflection is from the apex of the saddle-shaped image line to the surface of the image line from the A side. On the other hand, as shown in FIG. 10 (c), when the side on the A ′ side in the drawing is tilted so as to approach the observer (13b), the incident light on the surface of the second image line (10) is reflected. The strong reflection is on the surface of the image line from the apex of the bowl-shaped image line from the A ′ side.

  As shown in FIG. 10 (a), the first transparent image line (11a) overlaps the surface of the image line surface of the second image line (10) close to the observer (13b), and the second image line (10). When the second transparent image line (11b) overlaps the surface of the line (10) that is far from the observer (13b), the latent image printed material (1) as shown in FIG. 10 (b). Of the second image line (10), the image surface on the A side (the side far from the observer) strongly reflects light and emits an interference color. In the region where the second transparent image line (11b) overlaps, the incident light is blocked by the second transparent image line (11b) and an interference color cannot be emitted.

  Thereby, the shade of the interference color is born, and the second transparent image (8b) formed by the second transparent image line (11b) is visualized. Since the surface of the second image line (10) on the side where the first transparent image line (11a) is present does not form a normal line with the incident light, the surface of the first transparent image line (11a) Regardless of the presence or absence, the second image line (10) does not emit an interference color, and the first transparent image (8a) is not visualized. Therefore, as shown in FIG. 10B, when the A side in the figure is tilted so as to approach the observer (13b), only the second transparent image (8b) is visualized and visually recognized by the observer (13b). The

  On the other hand, when the latent image print (1) is tilted as shown in FIG. 10C, the surface of the image line on the A ′ side (side closer to the observer) of the second image line (10) is The light is strongly reflected and emits interference color, but the area where the first transparent image line (11a) overlaps the surface of the image line is blocked by the light incident on the first transparent image line (11a). Cannot emit color.

  Thereby, the shade of the interference color is born, and the first transparent image (8a) formed by the first transparent image line (11a) is visualized. Since the surface of the second image line (10) on the side where one second transparent image line (11b) is present does not form a normal line with the incident light, the surface of the second transparent image line (11b) Regardless of the presence or absence, the second image line (10) does not emit an interference color, and the second transparent image (8b) is not visualized. Therefore, as shown in FIG. 10C, when the A ′ side in the figure is tilted so as to approach the observer (13b), only the first transparent image (8a) is visualized and visually recognized by the observer (13b). Is done.

  Based on the above principle, in the observation angle region B, by slightly tilting the latent image print (1), an effect of changing the first transparent image (8a) and the second transparent image (8b) occurs. Since the second image line (10) in FIGS. 10 (b) and 10 (c) is a so-called deformed figure with emphasis emphasized for convenience of explanation, FIGS. 10 (b) and 10 (c). In the latent image printed material (1), there is a large difference in inclination, but the ratio between the image line height and the image line width is about 1:15 to 1: 500, although it is bowl-shaped. Therefore, the image changes with a change in inclination of only a few degrees.

  Subsequently, in the observation angle region C, specularly reflected light is hardly generated, so that the second image (5) loses the color flip-flop property, while a part of the first image (4) is lost. The image line is shielded from the observer's viewpoint by the rise of the second image line (10). In order to explain this shielding effect, in FIG. 11A, the observer places the viewpoint on the latent image printed material (1) in the observation angle region C in parallel with the first direction from the A′-B ′ line side. FIG. 11B shows a cross-sectional view of the A′-A line in this case, and FIG. 11C shows a cross-sectional view of the B′-B line in this case.

  The first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b) are first pitches that are half the pitch (P1). Since the phase is shifted in the direction, as shown in FIG. 11B, when the first image line (9) and the second image line (10) in the negative image line group (7b) overlap, The overlap of the first image line (9) and the second image line (10) in the positive image line group (7a) is reversed in the phase of the overlap of the two image lines as shown in FIG. It becomes a relationship.

  When the latent image printed material (1) is observed in the state shown in FIG. 11A, a shielding effect is produced by a swelled image line, and as shown in FIG. 11B, from the observer's viewpoint (13c). While the first image line (9) in the negative image line group (7b) in the trouble of the second image line (10) can be visually recognized, as shown in FIG. 11 (c), the observer's viewpoint (13c ), The first image line (9) in the positive image line group (7a) at the back of the second image line (10) cannot be visually recognized.

  Accordingly, the first image line (9) in the negative image line group (7b) can be visually recognized, while the first image line (9) in the positive image line group (7a) cannot be visually recognized. The negative image line group (7b) formed by the first image line (9) in 7b) is dark and the positive image line group (9) formed by the first image line (9) in the positive image line group (7a) ( 7a) becomes lighter, so that the letters “NIPPON” of the alphabet as the first significant information appear. At this time, the first transparent image (11a) and the second transparent image (11b) in the third image (6) are formed in a transparent or translucent light color. It is concealed by strong shading caused by the interference of the first image line (9) in the line (10) and the positive image line group (7a) and the first image line (9) in the negative image line group (7b). Therefore, only the first significant information is visually recognized in the observation angle region C.

  In the embodiment, the example in which the first image (4) of the latent image printed matter (1) has the simplest possible configuration has been described, but the configuration of the first image (4) is not limited thereto. . Several typical examples of the first image (4) will be described with reference to FIGS.

  FIG. 12A shows an angle at which the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b) are orthogonal to the first direction. Alternatively, it may have an inclination if it is 5 degrees or less. FIG. 12A shows an example having an inclination that rises to the right by about 2 degrees. However, if the inclination angle exceeds 5 degrees, moire occurs, which is not preferable. This is because the first image line (9) in the positive image line group (7a) and the first image line in the negative image line group (7b) as in the examples of FIGS. 7 (d) and 7 (e). Only one of the image lines in (9) overlaps the second image line (10), and this is an effective image line configuration to prevent the first significant information from being visualized in the observation angle region A.

  In the example shown in FIG. 12B, in addition to the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b), This is a configuration having a contour line (9c) showing the contour of the character “NIPPON” which is significant information. In this example, the first image line (9) in the positive image line group (7a) and the first image line (9) and the contour image line (9c) in the negative image line group (7b) are in the first direction. Are shifted by one third of the pitch (P1).

  Depending on the positional relationship of the overlap of the second image line (10) with respect to the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b), The first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b) have close color densities in the observation of the observation angle region C. The visibility of one significant information may be extremely reduced.

  In the case of the image line configuration in FIG. 12B, in the observation of the observation angle region C, the first image line (9) in the positive image line group (7a) and the first image line in the negative image line group (7b) ( 9) Even if the color density of any two of the outline drawing lines (9c) matches, the remaining one drawing line is the same as the two drawing lines having the same color density. Since a strong contrast is always generated between them, the first significant information cannot be visually recognized.

  FIG. 13A shows the difference in the line widths of the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b). The first significant information is visualized by providing the first significant information in the observation angle region A. However, if the difference between the line widths of the first line (9) in the positive line group (7a) and the first line (9) in the negative line group (7b) is too large, the observation angle region C However, the same first significant information as the observation angle region A is simply visually recognized as it is, and the effect of the image change in the observation angle region C of the image required by the present invention becomes poor.

  Therefore, depending on the color density of the first image (4), the first image line (9) in the positive image line group (7a) and the first image line (9) in the negative image line group (7b). When the difference between the image line widths is limited to about 50% to 150%, the appearing image becomes the same first significant information in the observation angle region A and the observation angle region C, but in the observation angle region C, One significant information can obtain the effect of negative / positive reversal.

  FIG. 13B shows the first significant line (9) in the positive line group (7a) and the first line (9) in the negative line group (7b). In addition to the first image (4) having information, it is an example further comprising an information part having second significant information (NPB characters). The first significant information is formed in the first image (9) by a shift in the phase of the image line, and the second significant information is formed by a difference in the image area ratio. In such a configuration, the second significant information is displayed in the observation angle region A, the first transparent image to the nth transparent image is displayed in the observation angle region B, and the first significant information is displayed in the observation angle region C. A latent image printed matter (1) which appears and has an extremely excellent change effect can be formed. Specific configurations and effects will be described in the second embodiment.

  As described above, an example of the first image (4) is shown in FIGS. 12 to 13, but the configuration of the first image (4) is not limited to this. Moreover, although the number of transparent images of the third image (6) is two (n = 2) in all the examples from the embodiment to the first and second embodiments, the number of latent images of about n = 5. If so, the image can be formed in the third image (6) of the present invention without any particular ingenuity. Incorporation of transparent images having a number exceeding n = 2 in the third image (6) can be easily realized by using the methods described in Patent Document 3 and Patent Document 4.

  In addition, by applying the technique described in Japanese Patent Application Laid-Open No. 2007-223308, image line groups, pixel groups, and micro image groups are continuously arranged at a pitch (P2) that is slightly different from the pitch (P1). Thus, the third image (6) is constructed, and in the observation of the observation angle region B, the moire image appears due to the interference between the second image (5) and the third image (6), and the latent image print is The effect of moving this moire can be realized when tilted and observed.

  Hereinafter, examples of the latent image printed matter that is specifically created according to the embodiment for carrying out the invention will be described in detail, but the present invention is not limited to the examples.

  Example 1 will be described with reference to FIGS. 14 to 19. In the first embodiment, the first image (4-1) is printed by the offset printing method, the second image (5-1) is printed by the screen printing method, and the third image is printed by the offset printing method. This is an example in which (1-1) is formed.

  FIG. 14 shows the latent image print (1-1) of the present invention. The latent image printed matter (1-1) is formed by forming a red printed image (3-1) on a general white coated paper (manufactured by Nippon Paper Industries Co., Ltd.).

  FIG. 15 shows each image element constituting the print image (3-1). The print image (3-1) is formed by forming the second image (5-1) on the first image (4-1), and further on the second image (5-1). Three images (6-1) are formed. The first image (4-1) is formed with uniform gradation, and the positive image line group (7a-1) and the negative representing the alphabet “NIPPON” which is the first significant information. It is divided into an image line group (7b-1). The third image (6-1) includes a first transparent image (8a-1) and a second transparent image (8b-1).

  FIG. 16 is a detailed drawing configuration diagram of the first image (4-1). In the first image (4-1), a plurality of first image lines (9-1) having an image line width of 0.15 mm are continuously provided at a pitch of 0.3 mm in the first direction (direction S1 in the drawing). The positive image line formed by arranging the letters “NIPPON” of the alphabet as the first significant information by positive and negative by shifting the phase of the first image line (9-1). It is divided into a group (7a-1) and a negative stroke group (7b-1).

  The phase shift in the first image line (9) was configured by shifting the phase by 0.15 mm in the S1 direction in the figure. The 1st image (4-1) of the above structures was printed on the base material (2-1) with the red coloring ink (DaiCue Aviglio process red N) by the UV offset wet offset printing.

  FIG. 17 shows a detailed drawing configuration diagram of the second image (5-1). The second image (5-1) is formed by continuously arranging a plurality of second image lines (10-1) having an image line width of 0.20 mm and having a pitch of 0.30 mm in the S1 direction. The image area ratio of the second image (5-1) is about 67%.

  The second image (5-1) was formed by superimposing the first image (4-1) on the first image (4-1) using the ink shown in Table 1 by the UV screen printing method. The ink shown in Table 1 contains a golden pearl pigment, is colorless and transparent when observed directly facing without entering light, and emits a golden interference color when incident light is incident. Further, the pearl pigment in the present ink has been subjected to an oil repellency treatment, and has an effect of easily leafing even on the surface of a wrinkled image. The raised height of the second image line (10-1) was about 12 μm.

  FIG. 18 shows a detailed image line configuration of the third image (6-1). The third image (6-1) is composed of 2 transparent images (n = 2), and the first transparent image (8a-1) representing the Japanese character “Japan” It comprises a second transparent image (8b-1) representing cherry blossoms.

  In the first transparent image (8a-1), the first transparent image line (11a-1) having an image line width of 0.15 mm is continuously arranged in the S1 direction at a pitch of 0.3 mm, and the second transparent image In (8b-1), the second transparent image line (11b-1) having an image line width of 0.15 mm was continuously arranged in the S1 direction at a pitch of 0.3 mm. The first transparent image line (11a-1) and the second transparent image line (11b-1) were arranged with a phase shift of 0.15 mm in the S1 direction. The third image (6-1) was printed on the second image (5-1) by UV dry wet offset printing using a transparent and low-gloss ink (matt medium manufactured by T & K TOKA).

  FIG. 19 shows the effect of the latent image print (1-1) of the present invention. FIG. 19 (a) shows the positional relationship between the light source (12-1), the latent image printed matter (1-1), and the observer's viewpoints (13a-1, 13b-1, 13c-1). ), FIG. 19C, and FIG. 19D show images that the viewer can visually recognize at the respective viewpoints (13a-1, 13b-1, and 13c-1). Observation was performed in a state where light was incident on the latent image printed matter (1-1) at an angle of about 45 degrees from the light source (12-1).

  First, in the observation in the observation angle region A where the viewpoint of the observer is the viewpoint (13a-1), the observer observes the first image (4-1) shown in FIG. 19B in red. It was. Subsequently, in the observation in the observation angle region B in which the observer's viewpoint is the viewpoint (13b-1), the observer sees the first transparent image (8a-1) and the second image shown in FIG. A transparent image (8b-1) was observed. Of the first transparent image (8a-1) and the second transparent image (8b-1), the letters “Japan” and cherry blossoms shown in black are red, and the other areas are observed in gold. It was. The first transparent image (8a-1) and the second transparent image (8b-1) were changed by slightly changing the inclination of the latent image printed matter (1-1). Finally, in the observation in the observation angle region C where the viewpoint of the observer is the viewpoint (13c-1), the observer will receive the letters “NIPPON” of the alphabet as the first significant information shown in FIG. Was observed. From the observer's viewpoint (13c-1), the first significant information was seen in a negative state, but when the latent image print was observed by inverting it up and down in the S1 direction, the density was reversed and the first significant information was obtained. It was confirmed that the first negative information “negative / positive reversal effect” was also observed.

  As described above, the first image (4-1) is observed in the observation angle region A, and the first transparent image (8a-1) and the second transparent image (8b-1) are observed in the observation angle region B. In the angle region C, the first significant information was observed, and an excellent change effect with vivid color change of the latent image printed matter (1-1) was confirmed.

  A second embodiment will be described with reference to FIGS. In the second embodiment, the first image (4-2) is printed by the offset printing method, the second image (5-2) is printed by the screen printing method, and the third image (6-2) is printed by the offset printing method. In this example, the latent image printed matter (1-2) is formed, and the second significant information that can be visually recognized in the observation angle region A is provided.

  FIG. 20 shows the latent image print (1-2) of the present invention. The latent image print (1-2) is formed by forming a blue print image (3-2) on a general white coated paper (manufactured by Nippon Paper Industries).

  FIG. 21 shows each image element constituting the print image (3-2). The print image (3-2) is formed by forming the second image (5-2) on the first image (4-2), and further forming the second image (5-2) on the second image (5-2). Three images (6-2) are formed.

  The first image (4-2) includes a positive image line group (7a-2) and a negative image line group (7b-2) representing the alphabetic “NIPPON” which is the first significant information; It consists of an information part (15-2) representing the letters “NPB” of the alphabet which is significant information. The third image (6-2) includes a first transparent image (8a-2) and a second transparent image (8b-2).

  FIG. 22 shows the detailed image line configuration of the positive image line group (7a-2) and the negative image line group (7b-2) constituting part of the first image (4-2). A plurality of first image lines (9-2) having an image line width of 0.2 mm are continuously arranged at a pitch of 0.4 mm in the first direction (S1 direction in the figure). A positive line group (7a-2) and a negative line group formed by shifting a part of the phase in 9-2) by expressing the letters “NIPPON” of the alphabet as the first significant information in positive and negative (7b-2). The phase shift was configured by shifting the phase by 0.2 mm in the S1 direction in the figure.

  FIG. 23 shows a detailed image line configuration of the information section (15-2) constituting a part of the first image (4-2). The information section (15-2) has information lines (16a-2, 16b-2) that form letters of the alphabet “NPB”, which is the second significant information. As a form thereof, two information image lines (16a-2, 16b-2) having an image line width of 0.05 mm are arranged in a 0.4 mm pitch, and a non-image having a width of 0.2 mm as a set. A plurality of line portions are provided and arranged in a first direction (direction S1 in the figure) with a pitch of 0.4 mm.

  24 shows the image lines constituting the positive image line group (7a-2) and the negative image line group (7b-2) shown in FIG. 22 and the information part (15-2) shown in FIG. The arrangement of image lines is shown. The image line constituting the first image (4-2) is as described above, but the first image (4-2) is the first significant information due to the phase shift of the image line. A character “NIPPON” is formed, and a character “NPB”, which is the second significant information, is formed by the difference in the image area ratio.

  The information image lines (16a-2, 16b-2) shift at least a part of the phase by 0.2 mm in the first direction in response to the phase shift in the first image line (9-2). Thus, it is formed so as not to overlap with the first image line (9-2).

  The image area ratio of the positive image line group (7a-2) and the negative image line group (7b-2) is 50%, and the image area ratio of the information section (15-2) is 25%. The area ratio of the information section (15-2) is desirably 10% or more and 75% or less of the image area ratio of the positive image line group (7a-2) and the negative image line group (7b-2). If it is 10% or less, it is difficult to visually recognize the second significant information in the observation in the observation angle region A, and if it is 75% or more, the second significant information is lost in the observation of the observation angle region B or the observation angle region C. This is because the change effect may be low. In addition, the area ratio of the information part (15-2) in Example 2 comprised 50% of the image area ratio of the background part.

  This first image (4-2) was printed on the substrate (2-2) with a blue colored ink (DaiCue Aviglio process indigo) by UV dry wet offset printing.

  FIG. 25 shows the second image (5-2). The second image (5-2) has the same configuration as that of the first embodiment, and the second image line (10-2) having an image line width of 0.30 mm having a bulge is formed in the first direction (S1 direction in the figure). ) Are continuously arranged at a pitch of 0.40 mm. The image area ratio of the second image (5-2) is about 75%.

  The second image (5-2) was formed by using the ink shown in Table 2 so as to be superimposed on the first image (4-2) by the UV screen printing method. The ink shown in Table 2 contains a red pearl pigment, and is colorless and transparent when observed directly facing light without direct incidence, and emits a red interference color when light is incident. Further, the pearl pigment in the present ink has been subjected to an oil repellency treatment, and has an effect of easily leafing even on the surface of a wrinkled image. The raised height of the second image line (10-2) was about 15 μm.

  FIG. 26 shows a third image (6-2). The third image (6-2) is composed of 2 (n = 2) transparent images as in the first embodiment, and is a first transparent image representing the characters “Japan” in Chinese characters. (8a-2) and a second transparent image (8b-2) representing "cherry blossoms". In the first transparent image (8a-2), the first transparent image line (11a-2) having an image line width of 0.2 mm is continuously formed in the first direction (direction S1 in the drawing) at a pitch of 0.4 mm. The second transparent image (8b-2) has a second transparent image line (11b-2) having an image line width of 0.2 mm in the first direction (direction S1 in the figure) and a pitch of 0. They were arranged continuously at 4 mm. The first transparent image line (11a-2) and the second transparent image line (11b-2) were arranged with a phase shift of 0.2 mm in the first direction (S1 direction in the figure). The third image (6-2) was printed on the second image (5-2) by UV dry wet offset printing using a transparent and low-gloss ink (matt medium manufactured by T & K TOKA).

  FIG. 27 shows the effect of the latent image printed material (1-2) of the present invention. FIG. 27A shows the positional relationship between the light source 12-2, the latent image printed matter 1-2, and the viewpoints 13a-2, 13b-2, and 13c-2 of the observer. ), FIG. 27C, and FIG. 27D show images that the observer can visually recognize at the respective viewpoints (13a-2, 13b-2, and 13c-2). Observation was performed in a state where light was incident on the latent image printed material (1-2) at an angle of about 45 degrees from the light source (12-2).

  First, in the observation in the observation angle region A in which the viewpoint of the observer is the viewpoint (13a-2), the observer has a first image (4) representing the first significant information shown in FIG. -2) was observed in blue. Subsequently, in the observation in the observation angle region B where the observer's viewpoint is the viewpoint (13b-2), the observer sees the first transparent image (8a-2) and the second image shown in FIG. A transparent image (8b-2) was observed. Of the first transparent image (8a-2) and the second transparent image (8b-2), the letters “Japan” and cherry blossoms shown in black are observed in blue, and the other areas are observed in red. It was. The first transparent image (8a-2) and the second transparent image (8b-2) were changed by slightly changing the inclination of the latent image print (1-2). Finally, in the observation in the observation angle region C in which the observer's viewpoint is the viewpoint (13c-2), the observer will receive the letters “NIPPON” of the alphabet as the first significant information shown in FIG. Was observed. From the observer's viewpoint (13c-2), the first significant information was dark blue, which looked negative, but when the printed material was viewed upside down in the S1 direction, the shade was reversed and the first Significant information was seen in a positive state, and it was confirmed that a “negative / positive reversal effect” also occurred.

  As described above, in the observation angle region A, the second significant information of the first image (4-2) is displayed. In the observation angle region B, the first transparent image (8a-2) and the second transparent image (8b) are displayed. -2), the first significant information was observed in the observation angle region C, and an excellent change effect with vivid color change of the latent image printed matter (1-2) could be confirmed.

  Example 3 will be described with reference to FIGS. 28 to 33. FIG. In Example 3, the first image (4-3) is printed by the offset printing method, the second image (5-3) is printed by the screen printing method, and the third image (6-3) is printed by the offset printing method. In this example, the latent image printed matter (1-3) is formed, and the first image (4-3) is formed in a plurality of different colors.

  FIG. 28 shows a latent image print (1-3) of the present invention. The latent image printed matter (1-3) formed a green printed image (3-3) on general white coated paper (manufactured by Nippon Paper Industries Co., Ltd.).

  FIG. 29 shows each image element constituting the print image (3-3). The print image (3-3) is formed by forming the second image (5-3) on the first image (4-3), and further forming the second image (5-3) on the second image (5-3). Three images (6-3) are formed. The first image (4-3) is formed with a uniform gradation, and the negative image line group (7a-3) and the negative representing the alphabet “NIPPON” which is the first significant information. It is divided into drawing line groups (7b-3). The third image (6-3) includes a first transparent image (8a-3) and a second transparent image (8b-3).

  FIG. 30 shows the detailed image line configuration of the first image (4-3). The first image (4-3) includes a plurality of first image lines A (9a-3) and a plurality of first image lines B (9b-3) having different hues. In Example 3, the first image line A (9a-3) was formed in blue, and the first image line B (9b-3) was formed in yellow.

  The first image line A (9a-3) has a line width of 0.08 mm and a plurality of first image lines A (9a-3) arranged at a pitch of 0.3 mm in the first direction (S1 direction in the figure). -3) by shifting a part of the phase by 0.15 mm in the first direction (S1 direction in the figure), a part of the positive image group (7a-3) and the negative image group (7b-3) It is divided into a part of.

  The second image line B (9b-3) is formed by arranging a plurality of image lines with a line width of 0.08 mm and a pitch of 0.3 mm in the first direction (direction S1 in the figure). By shifting a part of the phase in (9b-3) by 0.15 mm in the first direction (S1 direction in the figure), a part of the positive image group (7a-3) and the negative image group (7b- It is divided into a part of 3).

  Since the first image line A (9a-3) and the second image line B (9b-3) are both out of phase in the first direction (direction S1 in the figure) by 0.15 mm, The phases of the first image line A (9a-3) possessed by the line group (7a-3) and the first image line B (9b-3) possessed by the negative image line group coincide with each other. Of the first image line A (9a-3) possessed by the positive image line group and the first image line B (9b-3) possessed by the negative image line group. It is formed so that the phases match.

  As described above, since the first image line A (9a-3) is formed in blue and the first image line B (9b-3) is formed in yellow, the first image (4-3) is formed. Is visually observed as green, which is a composite color of blue and yellow, because the line pitch is narrow.

  Of the first image (4-3) having the above-described configuration, the first image line A (9a-3) is a blue colored ink (DaiCue Aviglio Process Indigo N) and the first image line B (9b-3) was printed by wet offset printing on the substrate (2-3) with a yellow colored ink (DaiCue Aviglio process transparent yellow N).

  FIG. 31 shows the second image (5-3). The second image (5-3) has the same configuration as that of the first embodiment, and the second image line (10-3) having a rising image line width of 0.20 mm is formed in the first direction (the direction S1 in the drawing). ) Consecutively arranged with a pitch of 0.30 mm. The image area ratio of the second image (5-3) is about 67%.

  The second image (5-3) was formed by superimposing the first image (4-3) on the first image (4-3) using the ink shown in Table 1 by the UV screen printing method. The raised height of the second image line (10-3) was about 12 μm.

  FIG. 32 shows a third image (6-3). The third image (6-3) has the same configuration as that of the first embodiment. The third image (6-3) is composed of 2 transparent images (n = 2), and the first transparent image (8a-3) representing the character “Japan” in kanji and the cherry blossom It comprises a second transparent image (8b-3) representing flowers. In the first transparent image (8a-3), the first transparent image line (11a-3) having an image line width of 0.15 mm is continuously arranged in the first direction (direction S1 in the drawing) with a pitch of 0.3 mm. In the second transparent image (8b-3), the second transparent image line (11b-3) having an image line width of 0.15 mm is continuously formed in a first direction (direction S1 in the drawing) with a pitch of 0.3 mm. Arranged. The first transparent image line (11a-3) and the second transparent image line (11b-3) were arranged with a phase shift of 0.15 mm in the first direction (S1 direction in the figure). The third image (6-3) was printed on the second image (5-3) by wet offset printing using a UV drying method, using a transparent and low-gloss ink (matt medium manufactured by T & K TOKA).

  FIG. 33 shows the effect of the latent image print (1-3) of the present invention. FIG. 33 (a) shows the positional relationship between the light source (12-3), the latent image printed matter (1-3), and the observer's viewpoints (13a-3, 13b-3, 13c-3). ), FIG. 33 (c), and FIG. 33 (d) show images that can be viewed by the observer at the respective viewpoints (13 a-3, 13 b-3, and 13 c-3). Observation was performed in a state where light was incident on the latent image printed matter (1-3) at an angle of about 45 degrees from the light source (12-3).

  First, in the observation in the observation angle region A where the observer's viewpoint is the viewpoint (13a-3), the observer observes the first image (4-3) shown in FIG. 33 (b) in green. It was. Subsequently, in the observation in the observation angle region B where the observer's viewpoint is the viewpoint (13b-3), the observer sees the first transparent image (8a-3) and the second image shown in FIG. A transparent image (8b-3) was observed. Of the first transparent image (8a-3) and the second transparent image (8b-3), the letters “Japan” and cherry blossoms shown in black are green, and the other areas are observed in gold. It was. The first transparent image (8a-3) and the second transparent image (8b-3) were changed by slightly changing the inclination of the latent image printed material (1-3). Finally, in the observation in the observation angle region C in which the observer's viewpoint is the viewpoint (13c-3), the observer will receive the letters “NIPPON” of the alphabet as the first significant information shown in FIG. Was observed.

  In Example 3, when the latent image printed material (1-3) is observed from the viewpoint (13c-3) of the observer, the positive image line group (7a-3) in which the first significant information is expressed in positive is blue. The negative image line group (7b-3) in which the first significant information is represented by negative was seen in yellow, but when the printed matter was observed upside down in the S1 direction, the latent image printed matter (1-3) The hue was reversed and the positive image group (7a-3) appeared yellow and the negative image group (7b-3) appeared blue.

  Therefore, it was confirmed that by reversing the upper and lower sides of the printed matter, not only the “shading inversion effect” as in the first and second embodiments but the “hue inversion effect” rich in color expression was generated.

  As described above, the first image (4-3) is observed in the observation angle region A, and the first transparent image (8a-3) and the second transparent image (8b-3) are observed in the observation angle region B. In the angle region C, the first significant information was observed, and an excellent change effect with vivid color change of the latent image printed matter (1-3) could be confirmed.

1, 1-1, 1-2, 1-3 Latent image printed matter 2, 2-1, 2-2, 2-3 Base material 3, 3-1, 3-2, 3-3 Print image 4, 4- 1, 4-2, 4-3 First image 5, 5-1, 5-2, 5-3 Second image 6, 6-1, 6-2, 6-3 Third image 7a, 7a -1, 7a-2, 7a-3 Positive image group 7b, 7b-1, 7b-2, 7b-3 Negative image group 8a, 8a-1, 8a-2, 8a-3 First transparent image 8b, 8b-1, 8b-2, 8b-3 Second transparent images 9, 9-1, 9-2, 9-3, 9a-3, 9b-3 First image lines 10, 10-1, 10- 2, 10-3 Second image line 11a, 11a-1, 11a-2, 11a-3 First transparent image line 11b, 11b-1, 11b-2, 11b-3 Second transparent image line 12 Light source 13a, 13b, 13c, 13a-1, 13b- , 13c-1,13a-2
13b-2, 13c-2, 13a-3, 13b-3, 13c-3 The viewpoint 15-2 of the observer Information section 16a-2 Information line A
16b-2 Information line B
P1, P2 Pitch W1, W2, W3, W4, W5 Line width

Claims (7)

The printed image has at least a part of the substrate, and the printed image has a color flip-flop property on the first image having a color different from the color of the substrate. Overlaid with a second translucent image, overlaid with a third image formed transparent or translucent on the second image,
The first image has a plurality of first image lines continuously arranged in a first direction at a first pitch, and a phase of a part of the first image line is different, It is divided into a positive line group and a negative line group that constitute the first significant information,
The second image has a plurality of second image lines continuously arranged in the first direction at the first pitch,
The third image has one or more transparent images up to a first transparent image, a second transparent image, ..., an nth transparent image (n is an integer of 1 or more),
i) When n = 1, the first transparent image includes a plurality of first transparent image lines arranged in the first direction at the first pitch,
ii) When n> 1, the first transparent image includes a plurality of first transparent image lines arranged in the first direction at the first pitch, and the second transparent image is A plurality of second transparent image lines are arranged in the first direction at the first pitch,..., The nth transparent image has the nth transparent image line at the first pitch. The first transparent image line, the second transparent image line,..., The nth transparent image line do not overlap each other, and are arranged in the first direction. The phase is shifted in the first direction,
At least one of the first image, the first transparent image, the nth transparent image, and the first significant information can be visually recognized under a visible light source according to changing the observation angle at the time of observation. Latent image printed matter characterized by. 2. The latent image printed material according to claim 1, wherein an image area ratio of the positive image line group and the negative image line group is 25% or more and 75% or less. The latent image printed matter according to claim 1, wherein the positive image line group and the negative image line group have the same image area ratio. The first image line formed by forming the negative image line group and the first image line formed by forming the positive image line group are half of the first pitch in the first direction. The latent image printed matter according to claim 1, wherein one pitch phase is different. When the number of the transparent images is two, the first transparent image line and the second transparent image line have phases different from each other by a half pitch of the first pitch. When there are n images, the first transparent image line, the second transparent image line,..., The nth transparent image line has a phase in each transparent image line of n of the first pitch. The latent image printed matter according to claim 1, wherein the latent image printed matter is different by a factor of one. The first image further includes an information part that constitutes second significant information, and the information part has the information line drawn in the first direction at the first pitch, and the first image line. The latent image printed material according to claim 1, wherein a plurality of the latent image printed materials are arranged without overlapping with each other. The latent image printed matter according to claim 6, wherein the image area ratio of the information section is 10% or more and 75% or less of the image area ratio in the positive image line group and the negative image line group.

Images