JP5206920B2 - Latent image printed matter - Google Patents

Description

  The present invention relates to a printed matter in which securities such as banknotes, stock certificates, bonds, and various certificates and important documents need to be prevented from being counterfeited and duplicated.

  Since printed materials such as banknotes, stock certificates, bonds and other securities and various certificates and important documents must be guaranteed or maintained, the line filter or lenticular lens etc. are applied to the printed matter with a special printing pattern. There is a printed material in which a latent image is developed by superimposing the discriminating tools, and a method of determining authenticity of the printed material by visually confirming the presence or absence of the latent image.

  For example, a printed matter in which a latent image appears by overlapping discriminating tools composed of line filters and its authenticity determination method include a background image portion printed with a line drawing line, and a line drawing with a different angle from the background image portion. There is a printed matter having a latent image portion printed with lines. The background image portion and the latent image portion of the printed matter are difficult to see at a glance, but when the line filter is superimposed on the printed matter at a predetermined angle, the background image portion and the latent image portion There is known a method for distinguishing and visually distinguishing.

  As an example, the printed material on which the pattern modulated in the first direction and the second direction is formed, and the first direction of the printed material coincides with the direction of the line pattern of the line filter. If the angle at which the first multi-tone image formed by superimposing the line filters is overlapped with the second direction of the printed matter is changed to the second multi-tone image formed by superimposing the line filters. There is a printed matter and an image forming method characterized in that a multi-tone image is formed (see, for example, Patent Document 1).

  In addition, a plurality of types having a latent image portion formed by shifting the line phase by ½ pitch with respect to the line pattern having the same pitch and width on the base material, with line portions and non-line portions. Each of the latent image line patterns is a printed material having a latent image printed by being overlapped at different angles, and the plurality of types of latent image line patterns have different colors, and There is an image forming method characterized in that a latent image portion is visualized by superimposing a film having the same pitch as the line pattern of the printed matter on the plurality of types of latent image patterns (for example, see Patent Document 2). .

  Further, each dot constituting a dot pattern in which an image appears by superimposing a lens array (fly eye lens, honeycomb lens, lenticular lens, etc.) on a substrate has at least two types of screen lines, and In a printed matter consisting of halftone dots of at least two types of screen angles, if it is genuine, the dot area ratio of each dot constituting the dot pattern is the same, so that a specific image appears by overlapping the lens arrays. In the case of a copy, there is a printed matter in which copying reproduces the dots reproduced at the screen line size or halftone dot angle, and an image different from the specific image appears by changing the dot density ( For example, see Patent Document 3).

Japanese Patent Laid-Open No. 10-230684 JP 2004-174997 A JP 2001-324949 A

  However, Japanese Patent Application Laid-Open No. 10-230684 has a problem of changing the direction (angle) in which the discriminating tools are overlapped according to the direction of the printed matter. Further, there is a problem that an image formed by a line filter or the like is limited to a single-color multi-tone image.

  Japanese Patent Laid-Open No. 2004-174997 can form a multicolor image, but the latent image is visualized by shifting the line phase by ½ pitch, that is, the same pitch. Becomes a two-tone image. In addition, since multiple types of latent image line patterns are printed at different angles, printing is performed according to the angle of each latent image line pattern to form a multi-tone latent image. There was a hassle of changing the angle at which the tools overlap. Furthermore, the number of combinations of latent image line patterns is limited to three colors, and if more than that color is used, the entire latent image is darkened and the color reproducibility is poor even when visualized. was there.

  Japanese Patent Application Laid-Open No. 2001-324949 uses the characteristics of input / output resolution, and the input / output resolution of an image is increased or moiré is reduced in digital devices such as recent copiers and ink jet multifunction peripherals. With the development of correction functions such as functions, the occurrence of dot density may be suppressed by copying or moire reduction functions so as not to crush the dot pattern.

The present invention is a latent image printed matter in which a plurality of pixels of the same color are regularly arranged on a base material to form two latent image images, and the phase is shifted in a first direction in the plurality of pixels. The first latent image pattern by the first region printed with the non-functional ink and the second latent image pattern by the second region printed with the functional ink, and the function A latent image printed matter comprising a background pattern printed with the same ink as the ink having no property.

The present invention is the latent image printed matter in which a region where the first region and the second region are overlapped is printed with a functional ink.

The present invention is a latent image printed matter in which a plurality of pixels are regularly arranged on a base material to form two latent image images, the plurality of pixels having a phase shifted in a first direction, and The first latent image pattern by the first region including at least the region printed with the functional ink, and the second latent image pattern by the second region printed by the same ink as the functional ink And a background pattern printed with non-functional ink, and the first area is arranged in the second area.

The present invention is the latent image printed matter, wherein a partial region in the first region is composed of a plurality of pixels composed of ink having functionality and ink having no functionality.

The present invention is the latent image printed matter in which the plurality of pixels constituting the first region and the second region are of the same color.

In the present invention, the pixels of the first region and the second region printed with the functional ink and some pixels of the background pattern printed with the non-functional ink have the same color and function. The pixels of the first region and the second region printed with non-functional ink and the pixels other than some of the pixels of the background pattern printed with non-functional ink have the same color Latent image printed matter.

According to the present invention, in the second region printed with the functional ink, the third pixels arranged in a second direction different from the first direction so that the phases of the plurality of pixels are shifted. A latent image printed matter having a latent image pattern of

The present invention is the latent image printed matter, wherein the first region and the third region are partially overlapped.

The present invention is a latent image printed matter in which a plurality of pixels of the same color are regularly arranged on a base material to form two latent image images, wherein the plurality of pixels have a phase in a first direction. And the first latent image pattern by the first area including at least the area printed with the functional ink, and the second area by the second area printed with the same ink as the functional ink. 2 latent image patterns and a background pattern printed with an ink having a different function from the functional ink, wherein the first area is disposed in the second area. Latent image printed matter.

The present invention provides an ink that excites or emits light when irradiated with predetermined light, a temperature indicating ink that changes color at a predetermined temperature, an optically variable ink whose color changes at a predetermined angle, or a designated ink. It is a latent image printed material that is any one of the inks that change color through a filter.

  In the latent image printed material of the present invention, a latent image is formed by regularly arranged pixels of the same color. Therefore, when the latent image printed material is observed only with the naked eye, it is difficult to visually recognize the latent image. It is.

  In the latent image printed matter of the present invention, when a discriminating tool such as a lenticular lens is brought into close contact with a phase shifted in the first direction in a plurality of pixels, the first latent image pattern is visually recognized. Since the second latent image pattern is visually recognized by performing processing corresponding to the functional ink on which the above area is printed, the clarity (discriminability) of the latent image is good.

  In addition, the latent image printed material of the present invention has a lenticular lens or the like in accordance with the phase shifted in the second direction by shifting the phase of the pixel in the second direction different from the first direction in the second region. When the discriminating tool is brought into close contact, the third latent image pattern is also visually recognized, so that three latent image patterns can be formed in one printed matter, and a printed matter having a high forgery prevention effect can be provided.

  In addition, since the latent image printed matter of the present invention is formed by phase-modulating the pixels in the first region forming the latent image in multiple gradations in the same direction, the latent image is converted into a multiple gradation image. It can be expressed by

  In addition, since the latent image printed material of the present invention forms a latent image with ink containing a functional material, it is possible to prevent forgery by copying using a scanner or a copying machine.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and various other embodiments are included within the scope of the technical idea described in the scope of claims. .

  In the latent image printed matter of the present invention, information cannot be visually recognized with visible light (or natural light), but the first information is obtained by intentionally shifting a part of regularly arranged pixels by phase modulation and superposing a lenticular lens. (Or latent image) can be visually recognized, pixels are divided into regions and pixels made of functional ink and pixels made of non-functional ink are printed in the same color, and certain wavelengths such as ultraviolet rays and infrared rays are printed. When the light is irradiated, only a region having functionality can be visually recognized as second information (or a latent image). Note that the same color means that when a pixel made of ink having functionality and a pixel made of ink having no functionality are observed with visible light (or natural light), they are observed to have the same color. In the present specification, the pixel is defined to be the same color even when the color that is viewed under the specific light source as the relationship is observed as a different color.

  FIG. 1 is a plan view showing an example of the latent image printed matter A1 of the present invention. As shown in FIG. 1, the latent image print A <b> 1 has pixels printed in a matrix on the substrate 1 and can be visually recognized as a uniform ground pattern 2 under visible light. Further, in all the print areas 5 printed by the pixels, the first area 3 ("1" area), the second area 4 ("H" area), and the pattern area 7 ("1" or A print area other than “H” is provided. However, even if the latent image printed matter A1 is viewed under visible light, the information “1” and “H” cannot be visually recognized.

  FIG. 2 is an observation view when the lenticular lens L is superimposed on the latent image printed matter A1. When the lenticular lens L is superimposed on the latent image printed matter A1 as shown in FIG. 2A, the first latent image, specifically, the character “1” can be visually recognized by the first region 3. . FIG. 2B is an enlarged view of the first region 3 and the surrounding pattern region 7. As shown in FIG. 2B, the first region 3 is composed of the pixel 3 ′ and the pattern region 7 is composed of the pixel 7 ′. The shape, size, pitch, and the like of the pixel 3 ′ and the pixel 7 ′ The colors are the same, and neither of the inks constituting the pixels has functionality. However, the pixel of the area | region which overlaps with the 2nd area | region 4 is not this limitation. In the pixel arrangement, the pixel 3 ′ and the pixel 7 ′ are arranged on the same extension line (or on the same straight line) in the vertical direction (Y direction). However, in the horizontal direction (X direction), the pixel 3 ′ and the pixel 7 ′ are not arranged on the same extension line (or on the same straight line), and the pixel 3 ′ is shifted by phase modulation. Note that by making the shift amount of the pixel 3 ′ smaller than the pixel 7 ′, information cannot be visually recognized even if the latent image printed matter A <b> 1 is visually recognized with visible light.

  As shown in FIGS. 2A and 2B, when the lenticular lens L is superimposed on the latent image printed matter A1 and observed, the first region 3 can be visually recognized as the first latent image. That is, since the pixel 3 ′ and the pixel 7 ′ are not arranged on the same extension line and are phase-modulated, the first region 3 can visually recognize information, specifically the number “1”.

  In the lenticular lens L, since a plurality of bowl-shaped lenses are formed like a line, the phase modulation direction of the first region matches the direction in which the bowl-shaped lenses are arranged (specifically, (Y direction) The first region formed by phase modulation is enlarged by overlapping the lenticular lens L with the latent image printed material A1, and the other regions are lost or concealed. The region is visually recognized as the first latent image.

  FIG. 3 is a diagram illustrating a state in which the second latent image is visually recognized when light of a specific wavelength is irradiated to the latent image printed matter A1 by the light source K. FIG. As shown in FIG. 3A, when the latent image printed matter A1 is irradiated with light of a specific wavelength, the letter “H” in the second region 4 can be visually recognized as the second latent image. FIG. 3B is an enlarged view of the second region 4 and the surrounding pattern region 7. As shown in FIG. 3B, the second area 4 is composed of a pixel 4 ′ and the pattern area 7 is composed of a pixel 7 ′. The arrangement, size, pitch, and the like of the pixel 4 ′ and the pixel 7 ′ The color is the same. For this reason, under visible light, even if the latent image printed matter A1 is visually recognized, the information “H” formed by the second region 4 cannot be visually recognized. On the other hand, the ink that constitutes the pixel 4 ′ has functionality, but the ink that constitutes the pixel 7 ′ does not have functionality. Therefore, when irradiated with light of a specific wavelength, “H” composed of the second region 4. Is visible. For this reason, the latent image printed matter A1 can visually recognize the information “1” by the first region 3 by overlapping the lenticular lens L under visible light.

  On the other hand, when light of a specific wavelength is irradiated, information “H” in the second region 4 can be visually recognized as shown in FIG. In the configuration of the present invention, the pixel in the region where the first region 3 and the second region 4 overlap has both the configuration of the pixel 3 ′ and the pixel 4 ′. The pixels 3 ′, 4 ′, and 7 ′ are illustrated as being large for the sake of schematic illustration, but it is desirable that the pixels be printed so fine that they cannot actually be seen. Moreover, it is preferable that carbon black is used for the 2nd area | region 4 for the ink which has functionality. In addition, the ink having no functionality preferably uses black of three colors of cyan, magenta, and yellow in the region other than the second region.

  FIG. 4 is a plan view showing an example of the latent image printed matter A2 which is another embodiment of the present invention. As shown in FIG. 4, the latent image printed matter A2 is different from the latent image printed matter A1 of FIGS. 1 to 3 in the arrangement and configuration of the second region 4, but the other configurations are the same. In particular, only different configurations will be described. The pixel 7 'in the pattern area 7 is composed of ink having no functionality. In addition, although the pixels 3 ′ in the first region 3 are made of functional ink, some of the pixels 3 ′ are functional regions 3 ′ a and nonfunctional regions 3 ′ b. It consists of The first region 3 is in the second region 4. At this time, the pixel 3 ′ in the first region 3 is arranged on the same extension line (or on the same straight line) in the vertical direction (Y direction) with respect to the pixel 4 ′ in the second region 4. 3 'and pixel 4' are arranged. However, in the horizontal direction (X direction), the pixel 3 ′ and the pixel 4 ′ are not arranged on the same extension line (or on the same straight line), and the pixel 3 ′ is shifted by phase modulation. The shape, size, pitch and color of the pixel 3 'and the pixel 4' are the same. The functionality of the functional area 3'a is the same as that of the pixel 4 '. FIG. 4C shows an example in which the pixel is divided in the vertical direction, the upper half pixel 3′a has functionality, and the lower half pixel 3′b has no functionality. The horizontal division may be used.

As shown in FIG. 4A, when the latent image print A <b> 2 is overlapped with the lenticular lens L under visible light, the information “1” can be visually recognized by the first region 3. On the other hand, when a specific wavelength is irradiated with the lenticular lens L overlapped, the pixels 3 ′ and 3 ′ a in the first region 3 having functionality can be visually recognized through the lenticular lens L. On the other hand, the pixel 7 ′ in the pattern region 7 and the pixel 3 ′ b in the first region 3 cannot be visually recognized through the lenticular lens L because they have no functionality. Therefore, the visually recognizable information is “1” in the first region 3. Further, since the pixel 3 ′ b in the first region 3 cannot be visually recognized, “rectangle” can be visually recognized as the second information in “1”. For this reason, the latent image printed matter A2 can visually recognize two pieces of information in two environments of visible light and a specific wavelength by overlapping the lenticular lens L.

FIG. 5 is a plan view showing an example of a latent image printed matter A3 according to another embodiment of the present invention. As shown in FIG. 5, the latent image printed matter A3 is different from the latent image printed matter A1 in FIGS. 1 to 3 in the arrangement and configuration of the second regions 4, and the first region 3 is the second region. 4 is arranged. In addition, a new area is provided inside the second area 4 and the arrangement and configuration of the pixels by phase modulation are changed. Since other configurations are the same, only different configurations will be described. As shown in FIG. 5 (d), the pixel 7 ′ in the pattern region 7 is composed of ink having no functionality, but the pixel 3 ′ in the first region 3 has functionality, Phase-modulated in the vertical direction (Y direction) and arranged offset. The second area 4 has a third area 6 in the area. The pixel 6 ′ in the third region 6 has functionality, shape, size, pitch and color are the same as the pixel 4 ′ in the second region 4. However, the arrangement position of the pixel 6 ′ is phase-modulated in a direction (X direction) different from the arrangement position of the pixel 3 ′, and is shifted in a direction different from the arrangement position of the pixel 3 ′.
Here, for ease of explanation, the phase modulation direction of the pixels is the XY direction. However, the phase modulation direction is not limited to the XY direction as long as the pixels to be phase-modulated are regularly arranged.

  As illustrated in FIG. 5A, when the lenticular lens L is superimposed on the latent image printed matter A <b> 3 under visible light, information “1” can be visually recognized by the first region 3. Further, as shown in FIG. 5B, when the latent image printed matter A3 is irradiated with a specific wavelength, information of “☆” can be visually recognized by the second region 4 having a function of absorbing the specific wavelength. Further, as shown in FIG. 5 (c), when a specific wavelength is irradiated in a state where the lenticular lens L is overlapped in a direction different from that in FIG. 5 (a), the second region 4 having the functionality of absorbing the specific wavelength The pixel 6 ′ in the third region 6 is visible through the lenticular lens L.

  On the other hand, regions other than the third region 6 cannot be visually recognized by the lenticular lens L because the pixel arrangement positions by the phase modulation are different. Therefore, the visually recognizable information is “1” in the first region 3, “☆” in the second region 4, and “☆” in the case where the third region 6 is formed in the second region 4. "◎" can be visually recognized as the third information. For this reason, the latent image printed matter A3 can visually recognize one information by irradiating a specific wavelength, and by overlapping the lenticular lens L, two information can be obtained depending on two environments of visible light and a specific wavelength. It can be visually recognized. Therefore, three pieces of information can be visually recognized.

  The shape of the pixels of the latent image prints A1, A2, and A3 is, for example, the shape of the pixel 3 ′, the pixel 4 ′, the pixel 7 ′, and the pixel 6 ′ as a circle, but the shape of the pixel is not particularly limited. The shape can be a rectangle, a circle, an ellipse, a star, a polygon, or the like. Further, it is desirable that all the pixels have the same shape, but the shape is not particularly limited. In the latent image prints A1, A2, and A3, the relationship between the pixel size (height and width) and the arrangement interval (pitch) is 1: 2, but the pixel size and arrangement interval are particularly limited. is not. Further, the arrangement intervals of the pixels of the latent image printed materials A1, A2, and A3 are the same in the horizontal direction and the vertical direction, but are not particularly limited. In addition, in order to improve the visibility of the latent image, it is desirable that the arrangement interval of the pixels in the same direction as the pitch direction of the lenticular lens is substantially the same as the pitch of the lenticular lens, but this is not restrictive.

  The substrate 1 on which the latent image prints A1, A2, and A3 are printed is not particularly limited, such as paper, plastic, film, and metal plate.

  The printing method for printing the latent image prints A1, A2, and A3 of the present invention is not particularly limited, such as an offset printing method, a gravure printing method, a screen printing method, a flexographic printing method, an ink jet printer, and a laser printer.

  The design of the print area 5 of the latent image prints A1, A2 and A3 of the present invention is not particularly limited because it can be composed of at least one of letters, numbers, symbols and patterns. Similarly, the design of the first region 3, the second region 4, and the third region 6 is not particularly limited, such as letters, numbers, symbols, and designs.

  In addition, the functional material is not particularly limited, and as an infrared absorber and a luminescent agent, for example, an ultraviolet excited visible luminescent agent, an ultraviolet excited infrared luminescent agent, an infrared excited visible luminescent agent, an infrared excited infrared luminescent agent, a visible light excited A well-known functional material such as a luminescent agent such as an infrared luminescent agent or a visible-light-excited visible luminescent agent, or a cholesteric liquid crystal used in temperature ink can be used. As the ink having optical change characteristics, ink having known optical change characteristics such as pearl ink can be used.

  For example, when an ink containing an infrared absorbing dye is used as a functional material, it is not particularly limited as long as it has infrared absorbing properties, and known gravure ink, screen ink, process ink, and the like can be used. For example, use of process inks such as cyan (C), magenta (M), yellow (Y), black (Bk) basic four color ink (hereinafter referred to as “basic four color ink”) black (Bk), etc. can do. For example, when a black pigment mainly composed of carbon black is used, this black ink has absorption characteristics over the entire region from the ultraviolet region to the infrared region. Further, the ink having infrared absorption characteristics is not limited to black ink, and ink obtained by adding carbon black to special color ink that does not contain an infrared absorbing pigment can also be used. The special color ink is an ink having a special color excluding the basic four-color ink.

  Moreover, when using the ink containing the infrared absorber for the pixel, it is preferable to use the ink which is the same color and does not contain the infrared absorber for the other pixels. The ink containing no infrared absorbing pigment is not particularly limited as long as it does not have infrared absorbing properties, and known gravure ink, screen ink, process ink, and the like can be used. For example, among the basic four color inks, cyan (C), magenta (M), and yellow (Y) have the property of not absorbing infrared rays, and if these three colors are superimposed, a black system can be expressed. The same effect as a pigment that does not absorb infrared rays can be obtained. Alternatively, chromofine black ink (manufactured by Dainichi Seika Kogyo Co., Ltd.) or dye-based ink for ink jet printer (for example, Canon-based dye-based black ink) can also be used.

  In addition, for example, in the case where the pixels 4 ′ and 7 ′ are printed with the ink containing the infrared absorbing pigment without using the ink that does not contain the infrared absorbing pigment, the infrared rays for printing the pixel 4 ′ and the pixel 7 ′ are printed. Ink containing absorptive dyes in a relative formulation, that is, latent images having different gradations by containing less or more infrared absorbing dyes in the ink for printing one of the pixels than the other A printed matter can also be produced. In addition, when the latent image printed material in this case is observed with an infrared camera, the pixel 4 'can be visually recognized relative to the pixel 7'.

  Next, a latent image print using an ink containing a luminescent agent as a functional material will be described. When an ink containing an ultraviolet light emitting agent is used as a functional material, it is not particularly limited as long as the functional material has a light emission characteristic depending on a specific wavelength, a fluorescent pigment that emits infrared light by ultraviolet excitation, and visible light emission by infrared excitation. A known material that emits light when irradiated with light of a specific wavelength, such as a fluorescent pigment that emits infrared light by visible light, can be used.

  For example, when an ink containing a luminescent agent is used for the pixel 4 ′, the pixel 7 ′ is preferably formed of an ink having the same color as the pixel 4 ′ and containing no luminescent agent. The ink which does not contain a luminescent agent is not particularly limited as long as it does not have luminescent properties, and a known ink can be used. Note that the pixel 4 ′ configured using the ink containing the fluorescent pigment uses the colorless ink containing the fluorescent pigment, and the same effect can be obtained even if it is printed on the ink not containing the fluorescent pigment.

  Next, a latent image print using cholesteric liquid crystal or the like used for the temperature indicating ink as a functional material will be described. When an ink containing a cholesteric liquid crystal or the like used for a temperature indicating ink is used as a functional material, it is not particularly limited as long as the functional material has a temperature indicating characteristic, and a known material can be used. For example, when an ink containing a cholesteric liquid crystal or the like used for the temperature indicating ink is used for the pixel 4 ′, an ink that is the same color as the pixel 4 ′ and does not contain a cholesteric liquid crystal or the like is used. It is preferable to use cholesteric liquid crystals having different characteristics.

  Next, a latent image print using pearl ink as ink having optical change characteristics will be described. When using an ink having an optical change characteristic, the ink is not particularly limited as long as it has an optical change characteristic, and a known material can be used. For example, when pearl ink is used for the pixel 4 ′, the pixel 7 ′ is the same color as the pixel 4 ′ and does not have an optical change characteristic, or a pearl having the same color and a different optical change characteristic. It is preferable to use ink.

  Next, a latent image print using an ink having metamerism characteristics will be described. When an ink having metamerism characteristics is used as the ink for forming the pixel 4 ′, any known material can be used as long as the ink has metamerism characteristics. When an ink having a metamerism characteristic is used for the pixel 4 ′, it is preferable to use an ink having a metamerism relationship with the ink used for the pixel 4 ′ for the pixel 7 ′.

  The colors of the pixel 3 ′, the pixel 4 ′, and the pixel 7 ′ that form the first area 3, the second area 4, and the pattern area 7 of the latent image printed matter A1 to A3 of the present invention are not only one color. Two or more colors can be used. For example, the pixels of the first region 3, the second region 4, and the pattern region 7 can be formed of pixels of two colors (black ink and magenta ink). Further, process basic four-color ink may be used. Further, the gradation of phase modulation has been described with reference to the two-gradation phase modulation in the drawings from the latent image prints A1 to A3, but may be multi-gradation such as 256 gradations. Therefore, if pixels are formed with four process colors and a latent image portion is formed by phase modulation of 256 gradations, a full color image of 256 gradations can be obtained as the first latent image. Thus, a multi-tone image having a desired number of colors can be obtained.

  For example, in the case of two colors, the pixels may be arranged alternately in the horizontal direction in the two colors, and the same color in the vertical direction. Alternatively, the two color pixels may be alternately arranged in the vertical direction, and the horizontal direction may be arranged in the same color. Furthermore, two colors can be alternately arranged in both the horizontal direction and the vertical direction.

  In addition, for example, in the case of process four-color ink, all four colors can be arranged in the horizontal direction or in the vertical direction, but the desired effect can be obtained by combining two colors in the horizontal direction and two colors in the vertical direction. can get. In addition, the arrangement order of each color is not particularly limited. Furthermore, it is possible to make an arrangement without periodicity (an arbitrary arrangement in which the colors are not arranged alternately). Note that it is desirable that the arrangement interval of the pixels of each color in the phase modulation direction substantially coincides with the lens pitch. Furthermore, in this case, in order to obtain a full-color image having four or more colors and good visibility, it is possible to arrange pixels of four colors in a direction different from the phase modulation direction, rather than arranging four colors in the phase modulation direction. desirable. Alternatively, an arrangement in which two colors are combined in the phase modulation direction and two colors in a direction different from the phase modulation direction is desirable. This is because in the case of the arrangement in the phase modulation direction, the arrangement interval depends on the lens pitch, and therefore the arrangement interval is limited, and the visibility and color reproducibility of the latent image may be reduced. On the other hand, in the case of the arrangement in a direction different from the phase modulation direction, the arrangement interval can be set without depending on the pitch of the lens. Can be set to placement.

Hereinafter, the latent image printed material of the present invention will be described in detail with specific examples.

Example 1
An example of a latent image print B1 using an ink containing an infrared absorbing dye (black A) and an ink not containing an infrared absorbing dye (black B and magenta) will be described with reference to FIG. The first region 3 phase-modulates the arrangement direction of the pixel 3K ′ made of ink containing an infrared absorbing dye (black A) and the pixel 3M ′ made of ink containing no infrared absorbing dye (magenta) in the same direction. They were staggered. The second region 4 includes a pixel 4K ′ made of ink (black A) containing the same infrared absorbing dye as the pixel 3K ′, and a pixel 4M ′ made of ink (magenta) not containing the same infrared absorbing dye as the pixel 3M ′. Were arranged regularly. In addition, the pattern region 7 includes a pixel 7K ′ by ink (black B) that does not contain the same color infrared absorbing pigment as the pixel 3K ′ and a pixel 7M by ink (magenta) that does not contain the same infrared absorbing pigment as the pixel 3M ′. 'Formed regularly.

  Specifically, a commercially available dedicated paper for ink jet printers (high quality exclusive paper made by Canon) is used as the base material, and a commercially available ink jet printer (PIXUS made by Canon, Inc.) is used with two colors of magenta and black. MP950). As the ink containing the infrared absorbing dye, a pigment black ink was used, and as the ink not containing the infrared absorbing dye, a dye black ink and a magenta ink were used. The pixels had a square shape with a side length of 127 μm, and the pixels were arranged in such a manner that two color pixels were alternately arranged in the horizontal direction, and the arrangement interval was 254 μm in the horizontal and vertical directions.

  When the lenticular lens L was observed while being superimposed on the latent image printed matter B1, as shown in FIG. 6A, the first region could be visually recognized as the first latent image. In the lenticular lens L, a plurality of bowl-shaped lenses are formed like lines. When the lenticular lens L is overlapped with the latent image print B1 so that the phase modulation direction of the first region 3 and the direction in which the bowl-shaped lenses are arranged coincide with each other, the phase modulation is performed. Since one area 3 is enlarged, “1” can be visually recognized as the first latent image.

  When the latent image print B1 is irradiated with infrared rays from the infrared light source K1 and observed using an infrared camera, as shown in FIG. 6B, the second region is set as the second latent image and “☆” is displayed. I was able to see. On the other hand, the pixel 7K ′ and the pixel 7M ′ in the pattern area 7, the pixel 3M ′ in the first area 3, and the pixel 4M ′ in the second area are printed with ink that does not contain an infrared absorbing dye. When the image was observed using an infrared camera, it could not be visually recognized.

  Further, since the ink containing the infrared absorbing dye and the ink not containing the infrared absorbing dye are of the same color, when the latent image print B1 is observed under a normal light source or natural light (visible light), the infrared absorbing property is obtained. The pixel 4K ′ printed using the ink containing the pigment and the pixel 7K ′ printed using the ink not containing the infrared absorbing pigment could not be viewed separately.

(Example 2)
With reference to FIG. 7, an example of a latent image print B2 using an ink containing an infrared absorbing dye (black A) and an ink containing no infrared absorbing dye (yellow, magenta, cyan) on the substrate 1 will be described. To do. The first region 3 phase-modulates the arrangement direction of the pixel 3K ′ made of ink containing an infrared absorbing dye (black A) and the pixel 3M ′ made of ink containing no infrared absorbing dye (magenta) in the same direction. They were staggered. In the second region 4, the pixels 4K ′ made of ink (black A) containing the same infrared absorbing pigment as the pixels 3K ′ and the pixels 4M ′ made of ink containing no infrared absorbing pigment (magenta) are regularly arranged. Formed. The pattern region 7 includes a pixel 7K ′ made of ink that does not contain an infrared-absorbing dye of the same color as the pixel 3 ′ (black composed of yellow, magenta, and cyan) and an ink that does not contain an infrared-absorbing dye (magenta). The pixels 7M ′ by (1) are regularly arranged.

  Specifically, commercially available dedicated paper for ink jet printers (high quality exclusive paper manufactured by Canon) is used as a base material, and printing is performed with a commercially available ink jet printer (PIXUS MP950 manufactured by Canon) using basic four-color inks. Went. A pigment-based black ink was used as the ink containing the infrared absorbing dye, and a black ink and a magenta ink composed of three primary colors of cyan, magenta, and yellow were used as the ink not containing the infrared absorbing dye. The pixels were squares with a side length of 127 μm, and the pixels were arranged in such a manner that two colors of pixels were alternately arranged in the horizontal direction, and the pitch was 254 μm in both the horizontal and vertical directions.

  When observing the lenticular lens L superimposed on the latent image printed matter B2, the first region could be visually recognized as the first latent image as shown in FIG. 7A. In the lenticular lens L, a plurality of bowl-shaped lenses are formed like lines. When the lenticular lens L is overlapped with the latent image print B2 so that the phase modulation direction of the first region 3 coincides with the direction in which the bowl-shaped lenses are arranged, the first phase formed by phase modulation is used. Since one area 3 is enlarged, “1” can be visually recognized as the first latent image.

  When the latent image print B2 is irradiated with infrared rays from the infrared light source K2 and observed using an infrared camera, as shown in FIG. 7B, the second region is set as a second latent image “☆”. Was visible. On the other hand, the pixel 7K ′ and the pixel 7M ′ in the pattern area 7, the pixel 3M ′ in the first area 3, and the pixel 4M ′ in the second area are printed with ink that does not contain an infrared absorbing dye. When the image was observed using an infrared camera, it could not be visually recognized. Further, since the ink containing the infrared absorbing dye and the ink not containing the infrared absorbing dye are of the same color, when the latent image print B1 is observed under a normal light source or natural light (visible light), the infrared absorption is achieved. The pixel 4K ′ printed using the ink containing the active dye and the pixel 7K ′ printed using the ink not containing the infrared absorbing dye could not be viewed separately.

(Example 3)
Next, referring to FIG. 8, a pixel 4M ′ printed with an ink containing a UV-excited visible light-emitting agent on the substrate 1 (printing a colorless fluorescent ink on magenta) and an ink containing no UV-excited visible light-emitting agent ( A second region 4 composed of pixels 4K ′ printed with black), a pixel 3M ′ printed with ink containing a UV-excited visible light emitting agent (printed with colorless fluorescent ink on magenta), and UV-excited visible light emitting agent. A first region 3 composed of pixels 3K ′ printed with ink (black) not containing a dye, and a pattern region composed of pixels 7M ′ and pixels 7K ′ printed with ink (magenta and black) not containing UV-excited visible light emitting agent An example of the latent image printed matter B2 having 7 will be described. Note that the configuration of each region, pixel arrangement position, size, pitch, shape, and the like are the same as those of the latent image printed material B1, and therefore only different configurations will be described.

  Specifically, a white fine paper of 97 μm thickness (made by Fukui Paper Industry Co., Ltd.) that does not contain a fluorescent brightener is used as a base material and is commercially available using magenta and black two-color inks. Printing was performed with an ink jet printer (PX-V630, manufactured by EPSON). As ink that does not contain a luminescent agent, magenta ink and black ink are used, and as a luminescent agent-containing ink, colorless fluorescent ink that emits yellow light by irradiating ultraviolet rays (Daiko's EPSON black light compatible ink yellow for EPSON) is used. And printed on magenta ink pixels.

  When the lenticular lens L was superposed on the latent image printed matter B3 and observed, the first latent image could be visually recognized as shown in FIG.

  When the latent image print B3 was observed by irradiating it with ultraviolet light from the black light K3, a second latent image as shown in FIG. 8B could be visually recognized. As shown in FIG. 8, the region formed by the pixel 4M ′ of the second region 4 and the pixel 3M ′ of the first region 3 of the latent image print B3 uses ink containing an ultraviolet-excited visible light emitting agent. Therefore, “☆” could be visually recognized as the second latent image.

  On the other hand, the pixel 4K ′ in the second region 4, the pixel 3K ′ in the first region 3, the pixel 7M ′ and the pixel 7K ′ in the pattern region 7 use ink that does not contain an ultraviolet-excited visible light emitting agent. Fluorescence emission did not occur and it was not possible to visually recognize. Ink containing UV-excited visible light-emitting agent and ink not containing UV-excited visible light-emitting agent are the same color, so when the latent image print B3 is observed under normal light source or natural light (visible light), UV-excited The pixel 4M ′ printed using the ink containing the visible light-emitting agent and the pixel 7M ′ printed using the ink not containing the ultraviolet light-excited visible light-emitting agent could not be visually recognized separately.

Example 4
Next, an example of a latent image print B4 using two inks having a metamerism relationship between the pixel 4M ′ and the pixel 7M ′ on the substrate 1 will be described with reference to FIG. Note that the configuration of each region, pixel arrangement position, size, pitch, shape, and the like are the same as those of the latent image printed material B1, and therefore only different configurations will be described.

Specifically, an ink having metamerism characteristics as shown in FIG. For the pixel 4M ′ and the pixel 3M ′, metamerism ink R having a peak in a specific wavelength region shown in FIG. 10A was used. An example of the composition of an ink having metamerism characteristics is as follows.
[Composition of red metamerism ink]
Purple pigment 1-5 parts by weight Red pigment (1) 1-5 parts by weight Red pigment (2) 0.5-1 part by weight Yellow pigment 20-30 parts by weight Varnish 55-65 parts by weight Auxiliary 5 10 parts by weight

The pixel 7M ′ has a spectral reflectance characteristic different from that of the ink in the specific wavelength region shown in FIG. 10A, and has substantially the same characteristics in the other wavelength regions. Ink G was used. An example of the composition of an ink having metamerism characteristics is as follows.
[Composition of green metamerism ink]
Green pigment 2 to 5 parts by weight Red pigment (1) 0.5 to 1 part Red pigment (2) 5 to 10 parts Yellow pigment 20 to 30 parts by weight Varnish 55 to 65 parts by weight auxiliary 5 10 parts by weight

  As shown in FIG. 10B, the filter F (Fuji Film optical filter SP-8) that characteristically extracts (transmits) a specific wavelength region has a transmittance of 0% at a wavelength of about 530 nm or less. The transmittance at a wavelength of approximately 600 nm or more is 90% or more. The red metamerism ink and the green metamerism ink shown in FIG. 10A are characterized by having different spectral reflectance characteristics in a specific wavelength region, and substantially the same spectral reflectance characteristics in other wavelength regions. Because of having the same color relationship. Therefore, when the latent image printed matter B3 is observed under a normal light source or natural light (visible light), the region formed by the pixels 4M ′ and 3M ′ and the region formed by the pixels 7M ′ are distinguished and visually recognized. I couldn't. On the other hand, when the latent image printed matter B4 is observed with the filter F overlapped, the latent image printed matter B4 is shielded (cut) by the filter at a wavelength of about 530 nm or less and only the wavelength region of about 600 nm or more is transmitted. Will observe. Therefore, the pixel 4M ′ and the pixel 3M ′ are observed in red because the spectral reflectance of the ink is high in this wavelength region, and the pixel 7M ′ has the spectral reflectance of the ink in the first region in the wavelength region. Since the pixel is relatively low with respect to the pixel, the pixel 4M ′, the pixel 3M ′, and the pixel 7M ′ are visually recognized in different colors, and therefore “☆” is displayed as the second latent image. Was visible.

  When the lenticular lens L was superposed on the latent image print B4 and observed, “1” could be visually recognized as the first latent image as shown in FIG.

  When the latent image print B4 is observed with a filter F that characteristically extracts or transmits a specific wavelength region, “☆” is visually recognized as the second latent image as shown in FIG. 9B. I was able to.

(Example 5)
Next, a latent image print B1 ′, which is a modification of the latent image print B1 of Example 1, will be described with reference to FIG. Note that the configuration of the first region and the second region, the arrangement position of the pixels, the size, the pitch, the shape, and the like are the same as those of the latent image printed material B1, and therefore only different configurations will be described.

  As shown in FIG. 11 (b), the latent image printed matter B1 ′ is a pixel 4K ′ made of an ink (black A) containing an infrared absorbing dye disposed inside the second region 4 and an ink containing no infrared absorbing dye. (Magenta) pixel 4M ', pixel 3K' arranged in the same direction and phase shifted in the same direction, and the same infrared absorbing dye as pixel 4K 'arranged in phase different from pixel 3M'. A third region 6 was formed by disposing a pixel 6K ′ made of ink (black A) and a pixel 6M ′ made of ink (magenta) not containing the same infrared absorbing pigment as the pixel 4M ′. Note that the pixels in the region where the first region 3 and the third region 6 overlap have both the configuration of the pixel 3K ′ and the pixel 3M ′ and the pixel 6K ′ and the pixel 6M ′.

  As shown in FIG. 11A, when the lenticular lens L is superimposed in a direction different from the direction in which the lenticular lens is superimposed in the case where the first latent image of the latent image printed matter B1 of Example 1 is visually recognized, infrared rays are irradiated. In FIG. 5, among the pixels forming the third region 6, “◎” was visually recognized with the pixel 6 </ b> K ′ as the third latent image.

  In the fifth embodiment, the pixels that form the third latent image pattern are phase-modulated in a direction different from the phase-modulated pixels that form the first latent image. The first latent image pattern is arranged in the Y direction and the third latent image pattern is arranged with a difference of 90 degrees from the X direction, but the phase modulation direction of the pixels forming the third latent image pattern is The phase modulation direction of the pixels forming the first latent image pattern and the third latent image pattern need only be arranged at an angle different from the phase modulation direction of the pixels forming the first latent image pattern. The phase modulation direction of the pixels forming the pixel is not limited to the vertical relationship (90 degrees).

Plan view showing one embodiment of latent image printed matter The top view which shows the 1st latent image of latent image printed matter A1, and its partial enlarged view The top view which shows the 2nd latent image of latent image printed matter A1, and its one part enlarged view A plan view showing a latent image of the latent image printed matter A2 and a partially enlarged view thereof A plan view showing a latent image of the latent image printed matter A3 and a partially enlarged view thereof A plan view showing a latent image of the latent image printed matter B1 and a partially enlarged view thereof A plan view showing a latent image of the latent image printed matter B2 and a partially enlarged view thereof A plan view showing a latent image of the latent image printed matter B3 and a partially enlarged view thereof A plan view showing a latent image of the latent image printed matter B4 and a partially enlarged view thereof Graph showing metamerism ink characteristics and filter transmission characteristics A plan view showing a latent image of the latent image printed matter B1 'and a partially enlarged view thereof

Explanation of symbols

A1, A2, A3, B1, B2, B3, B4, B1 ′ Latent image printed matter L Lenticular lens F Filter X Displacement Y Displacement 1 Substrate 2 Ground pattern 3 First region 4 Second region 5 Print region 6 Third 7 Pattern area 3 ', 4', 5 ', 6', 7 'Pixel K, K1, K2, K3, K4 Light source
a and b pixel area

Claims (2)

A printed region in which a plurality of pixels having two or more different colors are arranged in a matrix is formed on the substrate,
The print area is formed by only a first area constituting a first latent image pattern formed by shifting a phase of a part of the plurality of pixels in a first direction, and a functional ink. A second area constituting the second latent image pattern, and a pattern area other than the first area and the second area,
The plurality of pixels constituting the first region, the second region, and the pattern region have the same shape, size, and pitch,
The plurality of pixels constituting the first region and the pattern region are formed by ink having no functionality or ink having functionality different from the functionality,
In the first region, pixels of two or more different colors are arranged so that the first latent image pattern is a multi-tone image having a desired number of colors,
When a lenticular lens is overlaid on the print area, the first latent image pattern is visually recognized as a multi-tone image having a desired number of colors, and an observation method corresponding to the functional ink that forms the second area Then, the second latent image pattern is visually recognized. The second region includes a third region constituting a third latent image pattern formed by shifting a phase of a part of the plurality of pixels in a second direction different from the first direction. Have
The third latent image pattern is a function in which the second region is formed when the lenticular lens is overlapped along the second direction and the lenticular lens is overlapped along the second direction. The latent image printed matter according to claim 1 , wherein the latent image printed matter can be visually recognized by an observation method corresponding to an ink having a property.

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