Printed material

Abstract

To provide a printed material that enables switching of an image perceived according to the relationship with a light source, capable of forming high-resolution images, and easy to produce.SOLUTION: A printed material 1 comprises a bright layer 13 that contains a bright material and, when uniformly observed, does not display an image under a visual observation environment; a first printing layer 14 that is formed of a material having light transmittance, is laminated with the bright layer 13, and forms a first image 140; and a second printing layer 12 that is formed of a material not containing the bright material, is laminated on the side of the first printing layer 14 that is opposite to the observation side, and forms a second image 120.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This disclosure relates to printed matter. [Background technology]

[0002] There are known techniques for switching the image that is visible depending on the relationship with the light source. For example, the technique described in Patent Document 1 forms an image using a printed layer containing a glittering material, and switches the visible image by utilizing the fact that the reflection intensity of the glittering material changes depending on the relationship with the light source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-751 Summary of the Invention [Problem to be solved by the invention]

[0004] However, glittering materials (such as inks) contain glittering particles (such as pigments), and because the particle size of these glittering particles is relatively large, they are prone to clogging the printing plate. Furthermore, glittering materials are prone to printing defects, such as ink residue on the blanket, causing smearing. In particular, when attempting to form high-resolution images with glittering materials, the printing plate shape also becomes highly precise, making printing defects such as clogging and ink residue on the blanket even more likely to occur. Therefore, there is a problem in that printed materials using glittering materials are difficult to produce. Therefore, printing layers using conventional glittering materials are not suitable for forming high-resolution images, and it has been practical to form images with simple designs.

[0005] An object of the present disclosure is to provide a printed matter that can switch the image that is visible depending on the relationship with the light source, can form a high-definition image, and is easy to produce. [Means for solving the problem]

[0006] The present disclosure solves the above-mentioned problems by the following means: For ease of understanding, the following description will be given with reference numerals corresponding to the embodiments of the present disclosure, but the present disclosure is not limited to these.

[0007] The first disclosure is a printed matter (1, 1B, 1C, 1D) comprising a photoluminescent layer (13, 13B, 13C, 13D) that contains a photoluminescent material and is observed uniformly so that no image is observed under a visual environment, a first printed layer (14, 14B) that is formed from a light-transmitting material and is laminated with the photoluminescent layer (13, 13B, 13C) to form a first image (140), and a second printed layer (12, 12C) that is formed from a material that does not contain the photoluminescent material and is laminated on the side opposite the observation side of the first printed layer (14, 14B) to form a second image (120).

[0008] The second disclosure is a printed matter (1, 1B, 1C) according to the first disclosure, characterized in that the glossy layer (13, 13B, 13C) is uniformly formed by halftone dots or lines that are not visible to the naked eye.

[0009] The third disclosure is a printed matter (1D) described in the first disclosure, characterized in that the glossy layer (13D) is uniformly formed from a collection of symbols having a size of 300 μm or less.

[0010] The fourth disclosure is a printed matter (1, 1B, 1D) described in any one of the first to third disclosures, characterized in that it comprises a base material layer (11), the second printed layer (12) is laminated on the observation side of the base material layer (11), and the glossy layer (13, 13B, 13D) and the first printed layer (14, 14B) are laminated on the observation side of the second printed layer (12).

[0011] The fifth disclosure is a printed matter (1, 1D) characterized in that, in the printed matter (1, 1D) described in the fourth disclosure, the first printed layer (14) is positioned on the observation side of the glossy layer (13, 13D).

[0012] The sixth disclosure is a printed matter (1B) described in the fourth disclosure, characterized in that the glossy layer (13B) is positioned on the observation side of the first printed layer (14B).

[0013] The seventh disclosure is a printed matter (1B) described in the sixth disclosure, characterized in that a protective layer (15) is arranged on the observation side of the glossy layer (13B).

[0014] The eighth disclosure is a printed matter (1C) described in the first disclosure, characterized in that it comprises a base material layer (11), the glossy layer (13C) is laminated on the observation side of the base material layer (11), and the second printed layer (12C) is laminated on the observation side of the glossy layer (13C).

[0015] The ninth disclosure is a printed matter (1, 1B) described in any one of the first to third disclosures, characterized in that the more easily visible image between the first image (140) and the second image (120) is switched depending on the change in the relationship with the light source (LS). [Effects of the Invention]

[0016] According to the present disclosure, it is possible to provide a printed matter that is easy to manufacture, capable of switching the image that is visible depending on the relationship with the light source, and capable of forming a high-definition image. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing a layer structure of a printed matter 1 according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating how the second printed layer 12, the glossy layer 13, and the first printed layer 14 appear. [Figure 3] FIG. 2 is a diagram illustrating a visual image 201 obtained when the printed matter 1 is observed under diffuse reflected light. [Figure 4] FIG. 2 is a diagram illustrating a visual image 202 obtained when the printed matter 1 is observed under specular reflection light. [Figure 5] FIG. 10 is a diagram showing the layer structure of a printed matter 1B according to a second embodiment. [Figure 6] FIG. 10 is a diagram showing the layer structure of a printed matter 1C according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0019] (First embodiment) FIG. 1 is a diagram showing the layer structure of a printed matter 1 of the first embodiment. FIG. 2 is a diagram illustrating the appearance of the second printed layer 12, the glossy layer 13, and the first printed layer 14. Note that the following figures, including FIG. 1, are schematic diagrams, and the size and shape of each part are exaggerated or omitted as appropriate for ease of understanding. In the following description, specific numerical values, shapes, materials, etc. are used for explanation, but these can be changed as appropriate. In addition, in this disclosure, "transparent" refers to something that transmits at least the wavelength of light to be used. For example, even if a material does not transmit visible light, if it transmits infrared light, it will be treated as transparent when used in infrared applications.

[0020] In the printed matter 1 of the first embodiment, a base material layer 11, a second printed layer 12, a glossy layer 13, and a first printed layer 14 are laminated in this order from the back side to the observation side (front side). The observation side (front side) refers to the side from which the image displayed by the printed matter 1 is observed, and is the side (upper side) on which the first printed layer 14 is provided in FIG. 1. The back side is the side opposite the observation side (front side). In this specification and claims, unless otherwise specified, the term "laminated" includes not only a configuration in which two layers are directly laminated, but also a configuration in which two layers are indirectly laminated with a layer other than the two layers sandwiched between them.

[0021] The base layer 11 is a layer that forms the base of the printed matter 1 and may be formed from, for example, white paper. Note that the base layer 11 is not limited to white paper, and may be any material that has a flat surface that can support other layers, which will be described later. For example, the base layer 11 may be other materials such as fine paper, coated paper, art paper, tack paper, OCR paper, label paper, plastic card, film, etc.

[0022] The second printing layer 12 may be formed of a material that does not contain a glittering material. The second printing layer 12 is laminated on the opposite side (back side) of the glittering layer 13 and the first printing layer 14 (described later) from the observation side to form the second image 120. A material that does not contain a glittering material means that it does not contain a glittering material equivalent to the glittering material contained in the glittering layer 13 (described later). Therefore, the second printing layer 12 does not exclude the inclusion of a glittering material with a particle size sufficiently smaller than that of the glittering material contained in the glittering layer 13. More specifically, the second printing layer 12 may contain a glittering material with a particle size similar to that of other pigments, such as black, to an extent that it is unlikely to cause printing defects such as clogging in the printing plate shape. In other words, the second printing layer 12 may contain 3% of the glittering material.

[0023] To more clearly differentiate the appearance from the glossy layer 13 described below, it is desirable that the second printing layer 12 not contain any glossy material with a small particle size. The second printing layer 12 of this embodiment may be a black ink containing a black pigment but no glossy material. For example, general process ink can be suitably used for the second printing layer 12. The second image 120 can be formed using an ink that is less likely to cause printing defects such as clogging in the printing plate. Therefore, the second image 120 can be an extremely high-resolution image. Therefore, even a portrait, such as that shown in FIG. 2, can be formed as a high-quality image that is sufficiently pleasing to be appreciated. The second printing layer 12 can be formed by various printing methods. In offset printing, the fineness of the print can be expressed by the screen ruling, which indicates the number of lines that can be drawn per inch. Here, high definition means, for example, a screen ruling of 150 lines (resolution of 300 dpi) or more.

[0024] To facilitate understanding of the printing fineness (how detailed the image) that can be produced by the second printing layer 12, the screen ruling and resolution (dpi) for typical printed matter will be categorized and explained below. For rough printing of newspapers (such as on recycled paper), a screen ruling of 60 to 80 lines (resolution of 120 dpi to 160 dpi) can be used. For fine printing of books and magazines, which are primarily text-based, a screen ruling of 100 to 150 lines (resolution of 200 dpi to 300 dpi) can be used. For high-resolution color printing of catalogs, calendars, etc. (on coated paper, art paper, etc.), a screen ruling of 150 to 200 lines (resolution of 300 dpi to 400 dpi) can be used. Furthermore, for high-quality printed matter, such as photographs and paintings, a screen ruling of 300 lines (resolution of 600 dpi) or higher may be used.

[0025] Furthermore, although the second printed layer 12 in this embodiment is a black-and-white image formed using black ink, it may also be a color image formed by combining multiple colors of ink. In this embodiment, the second image 120 is formed in a single color using black ink, and therefore the second printed layer 12 is illustrated as being partially laminated on the base material layer 11. However, the second printed layer 12 may be a single-color, multi-tone second image 120. Furthermore, when the second image 120 is formed by combining multiple colors of ink, the second printed layer 12 may be laminated over the entire surface of the base material layer 11. Furthermore, in FIG. 2, the second printed layer 12 is illustrated as being partially provided, as if voids were present. However, the representation in FIG. 2 is a schematic representation for ease of understanding, and in reality, no such voids exist (the same applies to other figures). In this embodiment, as shown in FIG. 2, the second image 120 formed by the second printed layer 12 is a high-resolution photographic image. However, it goes without saying that the second image 120 formed by the second print layer 12 may be an image such as a simpler graphic.

[0026] Not only the second printed layer 12, but also the glossy layer 13 and the first printed layer 14 described below may be formed by offset printing. Offset printing generally refers to wet offset printing. However, the method for forming the second printed layer 12, glossy layer 13, and first printed layer 14 is not limited to wet offset printing, and may be, for example, gravure printing, dry offset printing, letterpress printing, waterless lithographic printing, flexographic printing, screen printing, intaglio printing, inkjet printing, laser printing, etc. Also, a combination of methods may be used, such as inkjet printing for the first printed layer, laser printing for the glossy layer, and offset printing for the second printed layer. In this way, the printed matter 1 can be variably printed using a printer. In particular, it is preferable to produce the layer closest to the substrate using normal printing (fixed printing) and the layer closest to the viewer using a printer (variable printing). This allows for efficient management of the contents to be shipped when the printed matter 1 is finally variable printed, improving production efficiency. The above-mentioned line count and resolution can be used as a measure of fineness to evaluate the print results regardless of the printing method used. The second print layer 12 can be printed with high fineness of 150 screen lines (300 dpi resolution) or more regardless of the printing method used.

[0027] The glittering layer 13 may be uniformly formed and contain a glittering material, or may not have an image formed thereon. The glittering layer 13 may be, for example, a silver ink containing aluminum powder, copper powder, zinc powder, tin powder, or iron phosphide. The glittering layer 13 may also be an ink obtained by mixing a silver ink with a chromatic ink containing a colored dye, such as a pigment or dye. The glittering layer 13 may also be an ink containing only a glittering material exhibiting a bluish gold or reddish gold color. Furthermore, the glittering layer 13 may also be an ink containing a glittering material exhibiting a bluish gold or reddish gold color, mixed with a chromatic ink containing the above-mentioned colored dye. The glittering layer 13 may also be an ink containing a functional pigment whose color changes when light is reflected, such as pearl ink, liquid crystal ink, OVI (Optical Variable Ink), or CSI (Color Shifting Ink). Pearl ink is an ink containing a pearl pigment that has a pearlescent luster compared to ordinary pigments and has its safety, gloss, and luxurious feel. Liquid crystal ink is an ink containing liquid crystals that have the property of changing color with temperature. Inks containing the above-mentioned glittering materials have the characteristic of changing their appearance depending on the light source. For example, silver ink appears dark gray under diffuse reflected light, which does not strongly reflect light, but appears lighter gray or white under specular reflected light, which strongly reflects light.

[0028] Furthermore, the glossy layer 13 may be formed uniformly as described above, or may not have an image formed thereon. Here, "formed uniformly and not having an image formed thereon" refers to a form in which the glossy layer 13 is observed to be uniform under normal visual conditions, and is provided in a manner in which no pattern (picture), lettering, or the like is recognizable. In this embodiment, the glossy layer 13 may be formed by solid printing of silver ink. Furthermore, the glossy layer 13 is not limited to solid printing, and may be formed, for example, in the form of fine stripes (lines) that are not visible to the naked eye, or in the form of fine halftone dots that are not visible to the naked eye.

[0029] Furthermore, even when the glossy layer 13 is solidly printed as described above, it may be formed to a thickness that allows the second image 120 formed by the second printed layer 12, which is provided on the backside of the glossy layer 13, to be observed through the ink. The glossy layer 13 contains a glossy pigment (glossy material), which may be dispersed in a binder. Since binders are typically optically transparent, the glossy layer 13 can be formed to have optical transparency. For example, the silver offset ink (UV No. 3 Silver manufactured by T&K TOKA) used in this embodiment can be observed through the second image 120 formed by the second printed layer 12, which is provided on the backside of the glossy layer 13, as long as the layer thickness is 4 μm or less. The glossy layer 13 in this embodiment was formed using a silver offset ink (UV No. 3 Silver manufactured by T&K TOKA) to a layer thickness of approximately 2 μm. Therefore, the glossy layer 13 can be observed through the second image 120 formed by the second printed layer 12, which is located on the back side of the glossy layer 13. For ease of understanding, FIG. 2 shows a glossy layer observation example 130, which shows the appearance of the glossy layer 13 alone. This glossy layer observation example 130 illustrates that the glossy layer 13 is uniformly observed and is shown as a reference for the appearance in FIG. 4 and other figures. Therefore, the glossy layer observation example 130 does not show that "dots" are actually observed, as in the glossy layer observation example 130 shown in FIG. 2. In this embodiment, the glossy layer 13 is solidly printed as described above, and therefore the transparency is preferably adjusted by the thickness. However, for example, if the glossy layer 13 is formed in a fine stripe pattern (line pattern) or a fine halftone dot pattern that is not visible to the naked eye, the transparency can be adjusted by adjusting the spacing and size of the stripes or halftone dots.

[0030] The first printed layer 14 is formed of a light-transmitting material and may be laminated with the glossy layer 13 to form a first image different from the second image. Here, being light-transmitting may be transparent or translucent, and refers to having enough light transmittance to allow the second image 120 formed by the second printed layer 12 to be observed through the glossy layer 13. The first printed layer 14 may be formed as a binary image by partially forming the first printed layer 14 on the glossy layer 13, or the first printed layer 14 may be formed as a monochromatic gradation image by providing multiple levels of shading in different locations.

[0031] Because the first printing layer 14 is transparent or translucent, it is difficult to see visually under diffuse reflected light. However, under specular reflected light, it reflects light different from that of the glossy layer 13 toward the observation point. Therefore, the first printing layer 14 allows the first image formed by the first printing layer 14 to be visually recognized against the background of the uniformly strong reflected light from the glossy layer 13. Examples of light-transmitting materials that can be used for the first printing layer 14 include matte OP varnish, gloss OP varnish, clear varnish, ink varnish, clear ink, and medium ink. When the first printing layer 14 is disposed on the outermost surface, a glossy ink may be used for the first printing layer 14. However, using a matte ink for the first printing layer 14 makes the difference from the uniformly strong reflected light from the glossy layer 13 more clear, making the first image more visible.

[0032] As shown in Fig. 2, the first printed layer 14 of this embodiment forms a first image 140 as a binary image by partially forming the first printed layer 14 on the glossy layer 13. In the example of Fig. 2, the first image 140 displays the characters "ABCDEFG." However, because the first printed layer 14 is optically transparent, the first image 140 is not visible or is difficult to see with the naked eye under diffuse reflected light.

[0033] Next, the appearance of the printed matter 1 of the first embodiment will be described. The visually perceived image (hereinafter referred to as the visual image) of the printed matter 1 of this embodiment varies depending on the relationship between the light source and the printed matter when observed. FIG. 3 is a diagram illustrating a visual image 201 when the printed matter 1 is observed under diffuse reflected light. Under diffuse reflected light, the first image 140 is difficult to see because the first printed layer 14 is optically transparent. Therefore, as shown in FIG. 3, the visual image 201 under diffuse reflected light is observed as the second image 120 passing through the uniform glossy layer 13. Note that FIG. 3 shows an observer O observing the printed matter 1 from the front (approximately normal to the surface of the printed matter 1). However, under diffuse reflected light, the visual image 201 will appear similar to the visual image 201 shown in FIG. 3 even when observed from another direction unless the conditions are equivalent to those under specular reflected light, which will be described later. Here, the second printed layer 12 is laminated on the side opposite to the observation side of the first printed layer 14. However, since the first printed layer 14 is formed from a light-transmitting material, the first printed layer 14 does not affect how the second image 120 formed by the second printed layer 12 appears.

[0034] FIG. 4 illustrates a visual image 202 when the printed matter 1 is observed under specular reflection light. The observation state shown in FIG. 4 is a positional relationship in which light from the light source LS is specularly reflected from the surface of the printed matter 1 and the reflected light reaches the observer O. When the printed matter 1 is observed under specular reflection light as shown in FIG. 4, the glossy layer 13 strongly reflects light. Therefore, when the glossy layer 13 of this embodiment is a silver ink, the visual image 202 appears paler gray or white. Furthermore, because the reflected light from the glossy layer 13 is strong, the second image 120 located on the backside is invisible or barely visible. Furthermore, when the printed matter 1 is observed under specular reflection light as shown in FIG. 4, the first printed layer 14 reflects light different from that of the glossy layer 13 toward the observation point. As a result, the first image 140 can be seen in the visual image 202 against the background of uniformly strong reflected light from the glossy layer 13. Therefore, when the printed matter 1 is observed under specular reflection light as shown in Figure 4, the second image 120 is not visible or is barely visible, while the first image 140 is visible against the background of the uniformly strong reflected light from the shiny layer 13. Therefore, when the printed matter 1 is observed under specular reflection light, the visible image 202 is observed as shown in Figure 4. Here, the second printed layer 12 is laminated on the side opposite the observation side of the first printed layer 14. Therefore, the second printed layer 12 does not affect the appearance of the first image 140 due to the first printed layer 14.

[0035] As described above, according to this embodiment, the printed matter 1 is configured to switch between the first image 140 and the second image 120, whichever is more easily visible, depending on the change in the relationship with the light source, while the glossy layer 13 is uniformly formed and does not form an image. This prevents the printed matter 1 from causing printing defects such as clogging of the printing plate due to the glossy material. Furthermore, by providing a second printing layer that forms the second image, the second printing layer can form a high-resolution second image. Therefore, the present disclosure can provide a printed matter 1 that can switch the visible image depending on the relationship with the light source, can form a high-resolution image, and is easy to manufacture.

[0036] Next, we will explain an evaluation test of the visibility of the patterns in the first printing layer 14 and the second printing layer 12 for the printed matter 1 of this embodiment when the density of the fine halftone dots forming the glossy layer 13 is changed. Here, the density of the halftone dots in the glossy layer 13 refers to the proportion of halftone dot printing per unit area, and a halftone dot density of 100% corresponds to a so-called solid printing state. The halftone dot density of the glossy layer 13 also includes the proportion of fine lines per unit area when fine halftone dots are replaced with fine lines.

[0037] The present applicant prepared printed matter having a glossy layer 13 with different halftone dot densities (20 to 100%). The present applicant then evaluated the visibility of the pattern (second image 120) of the second printed layer 12 under diffuse reflected light as shown in FIG. 3 and the visibility of the pattern (first image 140) of the first printed layer 14 under specular reflected light as shown in FIG. 4. Each evaluation was performed by an operator visually inspecting the printed matter 1 used in the evaluation test. When the pattern was sufficiently visible, it was evaluated as "Good." When the pattern was difficult to see but could be seen depending on the external environmental conditions, it was evaluated as "Good." When the pattern was not visible, it was evaluated as "Poor."

[0038] Each printed matter 1 used in the evaluation test had the same pattern printed under the same conditions on the second printed layer 12 and the first printed layer 14, and differed only in the dot density of the glossy layer 13. The glossy layer 13 was formed by offset printing using silver ink containing a glossy material. The evaluation results are summarized in Table 1 below.

[0039] [Table 1]

[0040] As shown in Table 1, when the dot density of the glossy layer 13 is 90% or less, the visibility of the pattern of the second printed layer 12 under diffuse reflected light was rated as "Good." However, when the dot density is 100%, i.e., solid printing, it was confirmed that the visibility of the pattern of the second printed layer 12 was rated as "Average." This evaluation result is thought to be due to the fact that when the dot density of the glossy layer 13 is 100% (solid printing), the amount of light that passes through the glossy layer 13 decreases, thereby reducing the amount of light that reaches the second printed layer 12.

[0041] (Regarding visibility of the image on the first printing layer 14) When the dot density of the glossy layer 13 is 70% or higher, the visibility of the image in the first printing layer 14 under specular reflected light was rated as "Good." However, when the dot density is 60%, the visibility of the image in the first printing layer 14 was confirmed to be "Average." Furthermore, when the dot density is 40% or lower, the visibility of the image in the first printing layer 14 under specular reflected light was confirmed to be "Poor." This suggests that if the dot density of the glossy layer 13 is too low, the specular reflection efficiency of the glossy layer 13 decreases, and that printed matter 1 with a dot density of the glossy layer 13 of 40% or lower affects the visibility of the image in the first printing layer 14.

[0042] From the above, in order to ensure the visibility of the patterns in the first printing layer 14 and the second printing layer 12, the lower limit of the dot density of the glossy layer 13 is preferably 60% or more, more preferably 70% or more. The upper limit of the dot density of the glossy layer 13 is preferably 100% or less, more preferably 90% or less.

[0043] (Second embodiment) FIG. 5 is a diagram showing the layer structure of printed matter 1B of the second embodiment. Printed matter 1B of the second embodiment differs from printed matter 1 of the first embodiment in that the positional relationship between glossy layer 13B and first printed layer 14B is reversed from the positional relationship between glossy layer 13 and first printed layer 14 of the first embodiment. Printed matter 1B of the second embodiment also differs from printed matter 1 of the first embodiment in that it includes a protective layer 15. The rest of the configuration of printed matter 1B of the second embodiment is the same as that of printed matter 1 of the first embodiment. Therefore, parts that perform the same functions as those of the first embodiment described above are assigned the same reference numerals, and duplicate explanations will be omitted as appropriate.

[0044] The printed matter 1B of the second embodiment has a base layer 11, a second printed layer 12, a first printed layer 14B, a glossy layer 13B, and a protective layer 15 laminated in this order from the back side to the observation side (front side).

[0045] The first printed layer 14B has the same configuration as the first printed layer 14 of the first embodiment, except that it is arranged on the back side of the glossy layer 13B. The first printed layer 14B forms the first image 140 (see FIG. 2) as in the first embodiment. In this embodiment, other layers (the glossy layer 13B and the protective layer 15) are arranged on the observation side of the first printed layer 14B. Therefore, using a glossy ink for the first printed layer 14B makes the difference in gloss easier to see, and the first image 140 formed by the first printed layer 14B can be more easily viewed.

[0046] The glossy layer 13B has the same configuration as the glossy layer 13 of the first embodiment, except that it is arranged closer to the observation side than the first printed layer 14B. Like the glossy layer 13 of the first embodiment, the glossy layer 13B is formed with a thickness that allows observation through the second image 120 formed by the second printed layer 12 provided on the back side of the glossy layer 13B. Therefore, in the printed matter 1B, not only the second image 120 but also the first image 140 formed by the first printed layer 14B arranged on the back side of the glossy layer 13B can be observed through the glossy layer 13B.

[0047] As described above, in printed matter 1B, the positional relationship between glossy layer 13B and first printed layer 14B is reversed from the positional relationship between glossy layer 13 and first printed layer 14 in the first embodiment. However, even with the arrangement of the layers in printed matter 1B of the second embodiment, as in the first embodiment, the more easily visible image between first image 140 and second image 120 switches depending on the change in the relationship with the light source. Therefore, printed matter 1B can achieve the same effect as printed matter 1 of the first embodiment.

[0048] Furthermore, in this embodiment, the printed matter 1B is provided with a protective layer 15. The protective layer 15 is laminated on the observation side of the glossy layer 13B and is a transparent layer with high light transmittance that protects the surface of the printed matter 1B. Providing the protective layer 15 can improve the durability of the printed matter 1B. The protective layer 15 can also be provided in the first embodiment and the third embodiment described below. However, for example, in the layer arrangement of the first embodiment, if the protective layer 15 is laminated directly on the first printed layer 14, the transparent protective layer 15 and the transparent first printed layer 14 will directly overlap. Therefore, in the printed matter provided with the protective layer 15 in the first embodiment, the visibility of the first image 140 formed by the first printed layer 14 may be reduced. In contrast, in the second embodiment, the glossy layer 13B is provided between the protective layer 15 and the first printed layer 14B. Therefore, in the printed matter 1B, the transparent layers do not come into contact with each other, and the visibility of the first image 140 formed by the first printed layer 14B is good.

[0049] (Third embodiment) 6 is a diagram showing the layer structure of printed matter 1C of the third embodiment. Printed matter 1C of the third embodiment is similar to printed matter 1 of the first embodiment, except that the positional relationship between second printed layer 12C and glossy layer 13C is reversed from the positional relationship between second printed layer 12 and glossy layer 13 of the first embodiment. Therefore, parts that perform the same functions as in the first embodiment described above are given the same reference numerals, and duplicate explanations will be omitted as appropriate.

[0050] The printed matter 1C of the third embodiment has a base layer 11, a glossy layer 13C, a second printed layer 12C, and a first printed layer 14 laminated in this order from the back surface side to the observation side (front surface side).

[0051] The glossy layer 13C has the same configuration as the glossy layer 13 of the first embodiment, except that it is arranged on the back side of the second printed layer 12C, i.e., is laminated directly on the base material layer 11. The glossy layer 13C does not need to be light transmissive because no other layers that form an image are provided on the back side of the glossy layer 13C.

[0052] The second printed layer 12C has the same configuration as the second printed layer 12 of the first embodiment, except that it is disposed at a position sandwiched between the first printed layer 14 and the glossy layer 13C.

[0053] As described above, in printed matter 1C, the positional relationship between second printed layer 12C and glossy layer 13C is reversed from the positional relationship between second printed layer 12 and glossy layer 13 in the first embodiment. However, even with the arrangement of the layers in printed matter 1C of the third embodiment, as in the first embodiment, the more easily visible image between first image 140 and second image 120 changes depending on the change in the relationship with the light source. Therefore, printed matter 1C can obtain the same effect as printed matter 1 of the first embodiment.

[0054] (Fourth embodiment) The printed matter 1D of the fourth embodiment has a layer structure similar to that of the printed matter 1 of the first embodiment shown in Fig. 1, but differs from the first embodiment in that the glossy layer 13D is formed by a collection of symbols that are not visible to the naked eye. Therefore, parts that perform the same functions as those in the first embodiment described above are given the same symbols, and duplicate explanations will be omitted as appropriate.

[0055] Instead of using halftone dots, the bright layer 13D of this embodiment is formed by a collection of symbols that are invisible to the naked eye. Here, symbols that are invisible to the naked eye refer to symbols that are too small to be recognized visually, but whose shapes can be recognized by magnifying them with a microscope or the like. More specifically, symbols that are invisible to the naked eye refer to symbols (letters, symbols, figures, etc.) that are 300 μm or smaller in size. Furthermore, the size of the symbol refers to the larger of the vertical and horizontal dimensions of the symbol.

[0056] The glossy layer 13D is formed by arranging multiple symbols that are invisible to the naked eye in a regular or irregular pattern. When the glossy layer 13D is viewed as a whole, it appears uniform; images need not be formed on it, and the symbols themselves cannot be recognized. The invisible symbols used in the glossy layer 13 may be multiple identical symbols across the entire surface of the glossy layer 13, or multiple different symbols may be used. For example, the glossy layer 13D may be formed by arranging multiple character strings of characters that are invisible to the naked eye in succession. The glossy layer 13D can be formed, for example, by arranging multiple microcharacters that are invisible to the naked eye.

[0057] In the glossy layer 13D, the area ratio of the invisible symbols is preferably approximately the same as the density of the halftone dots described in the first embodiment. That is, the lower limit of the area ratio of the invisible symbols in the glossy layer 13D is preferably 60% or more, more preferably 70% or more. Furthermore, the upper limit of the area ratio of the invisible symbols in the glossy layer 13D is preferably 100% or less, more preferably 90% or less. This allows the printed matter 1D to effectively ensure the visibility of the patterns in the first printing layer 14 and the second printing layer 12. Here, the area ratio of the invisible symbols refers to the proportion of the printed symbols per unit area.

[0058] In this way, the glossy layer 13D uses symbols that are not visible to the naked eye. Similar to the first embodiment described above, this glossy layer 13D can be observed to be uniform under normal visual conditions, and no image may be formed, making the symbols unrecognizable. This allows the printed matter 1D of this embodiment to achieve the same effects as the printed matter 1 of the first embodiment described above. The configuration of the glossy layer 13D of the printed matter 1D of this embodiment may also be applied to the glossy layer 13B of the printed matter 1B of the second embodiment and the glossy layer 13C of the printed matter 1C of the third embodiment.

[0059] The present disclosure is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the scope of the present disclosure. The present disclosure is not limited to the embodiments described above. [Explanation of symbols]

[0060] 1 Printed matter 1B Printed matter 1C Printed matter 1D prints 11 Base material layer 12 2nd printing layer 12C 2nd printing layer 13 Photoluminescent layer 13B Bright layer 13C bright layer 13D luminous layer 14 1st printing layer 14B 1st printing layer 15 Protective layer 120 2nd image 130 Example of observation of luminous layer 140 First Image 201 Visual Image 202 Visual Image

Claims

1. a bright layer that contains a bright material and is uniformly observed so that no image is observed under a visual environment; a first print layer formed of a light-transmitting material and laminated with the glossy layer to form a first image; a second print layer that is laminated on the side opposite to the observation side of the first print layer and forms a second image; A printed matter comprising:

2. The printed matter according to claim 1, The bright layer is uniformly formed of dots or lines that are not visible to the naked eye; A printed matter characterized by:

3. The printed matter according to claim 1, the bright layer is uniformly formed by a collection of symbols having a size of 300 μm or less; A printed matter characterized by:

4. The printed matter according to any one of claims 1 to 3, A substrate layer is provided, the second printed layer is laminated on the observation side of the base material layer, the glossy layer and the first printed layer are laminated on the observation side of the second printed layer; A printed matter characterized by:

5. The printed matter according to claim 4, the first print layer is disposed on the observation side of the glossy layer; A printed matter characterized by:

6. The printed matter according to claim 4, the glossy layer is disposed on the observation side of the first printed layer; A printed matter characterized by:

7. The printed matter according to claim 6, a protective layer is disposed on the observation side of the glossy layer; A printed matter characterized by:

8. The printed matter according to claim 1, A substrate layer is provided, The glossy layer is laminated on the observation side of the base layer, The second printed layer is laminated on the observation side of the glossy layer. A printed matter characterized by:

9. The printed matter according to any one of claims 1 to 3, switching between the first image and the second image to an image that is more easily visible in accordance with a change in the relationship with a light source; A printed matter characterized by:

Images