Brilliant video pattern

Abstract

To provide a glittering video pattern of a display medium of a three-dimensional image, in which reflected light is used as means for sampling an image divided and compressed by an integral photography method, and thereby smooth movement and bright expression are possible when compared to the conventional three-dimensional image.SOLUTION: The present invention relates to a glittering video pattern formed by combining a glittering element group and a latent image element group having optical properties different from those of the glittering element group or integrating the same, wherein the glittering element group is formed by disposing a plurality of diffraction gratings with regularity, and the latent image element group is formed by disposing each of a plurality of latent image elements, the latent image elements being obtained by dividing and compressing a plurality of base images, the base images being obtained by successively capturing a three-dimensional structure from the viewpoint of different viewing angles, with the same regularity as the glittering element group in the order of the viewpoint captured successively from different viewing angles, and a three-dimensional image is visually recognized three-dimensionally according to changes in the observation angle.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a display medium characterized in that the image reproduced under specular reflection light is a three-dimensional image with a stereoscopic effect in the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passes, which are security printed matter that require anti-counterfeiting effects. [Background technology]

[0002] Three-dimensional images reproduced by 3D holograms and lenticular technology are highly eye-catching and difficult to counterfeit, so in recent years they have tended to be used more and more as elements for determining the authenticity of security prints. A representative technology that has this change effect is holograms, which are widely used and affixed to security prints that require the highest level of security, such as banknotes and passports.

[0003] In the early days of holograms, the master was created by a photography method in which object light and reference light from an object were printed on a dry plate in the form of interference fringes. However, today, many holograms are created using a method such as the dot matrix method, in which fine diffraction gratings, equivalent to the halftone dots in printed matter, are arranged as dots on an image plane to create an arbitrary image. There are also holograms of a different type from the dot matrix method, in which a diffraction grating is rotated and moved to create an image in the form of lines. Furthermore, by drawing a diffraction grating with an electron beam, it is possible to create more precise and detailed images than conventional dot matrix holograms (see, for example, Patent Documents 1, 2, 3, and 4).

[0004] On the other hand, there is a technology that applies integral photography to achieve a hologram-like moving image effect by sampling a divided and compressed image using reflected light. For example, there is a technology that uses a divided compressed image to create a moving image effect by using a semi-cylindrical image or reflected light from a diffraction grating as a sampling means (see, for example, Patent Document 5 and Patent Document 6). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 59-154482 [Patent Document 2] Japanese Patent Publication No. 59-88780 [Patent Document 3] Japanese Patent Application Laid-Open No. 62-191874 [Patent Document 4] Japanese Patent Application Laid-Open No. 2000-063459 [Patent Document 5] Patent No. 5200284 [Patent Document 6] Patent Publication No. 2021-81705 Summary of the Invention [Problem to be solved by the invention]

[0006] In the holograms using diffraction gratings described in Patent Documents 2 to 4, excluding Patent Document 1 which is an analog hologram, the image that appears under specular reflection light appears as a three-dimensional image, thereby achieving a so-called stereoscopic visual effect. Multiple discontinuous images observed from slightly different viewpoints are drawn using dots and lines on the diffraction grating with different angles and frequencies, and the images are reproduced one after another like a flip book in response to changes in the angle of the incident light, thereby achieving a stereoscopic visual effect.

[0007] However, in holograms using diffraction gratings, if you try to emphasize the three-dimensional effect of a three-dimensional image and make the image appear to rotate smoothly as the viewing angle changes, the number of images that need to be rendered increases, and the rendering area allocated to each image becomes smaller. As a result, the reproduced images have low brightness and appear dark. This is partly because the reproduced images are actually separate, discontinuous images with no connection between them.

[0008] The technologies described in Patent Documents 5 and 6 have a special image line configuration in which a portion of an image divided and compressed using the integral photography method is sampled by a specific means, and while they are excellent in terms of video effects and can create a certain sense of perspective in the reproduced latent image, they are unable to express the latent image itself as anything other than a flat image with no three-dimensionality, and have the problem of being limited to the expression of three-dimensionality based only on perspective, known as layer depth.

[0009] The present invention aims to solve the above-mentioned problems and is a display medium for three-dimensional images, which is characterized by using reflected light as a means of sampling images divided and compressed using an integral photography method, thereby allowing for smoother movement and higher brightness than conventional three-dimensional images. [Means for solving the problem]

[0010] The present invention provides a glittering moving image pattern that is a combination or integration of a glittering element group and a latent image element group having optical properties different from those of the glittering element group, wherein the glittering element group is composed of a plurality of diffraction gratings arranged with a regularity, each of which has the function of continuously moving the area that reflects light as the angle of incident light changes, and the latent image element group is composed of a plurality of latent image elements that are each divided and compressed from a plurality of base images of a three-dimensional structure captured successively from viewpoints at different observation angles, and which are arranged in a plurality of latent image elements in the order of the viewpoints captured successively from the different observation angles with the same regularity as the glittering element group, and wherein under specular reflection light, only a portion of the latent image element group is sampled and visualized by the glittering element group, resulting in the appearance of a three-dimensional image of the three-dimensional structure, and the three-dimensional image can be viewed stereoscopically as the observation angle changes.

[0011] In the present invention, the glittering element is in the form of a dot, and the inside of the dot is Concentric circles or concentrated lines The glittering moving image pattern is characterized by being composed of a diffraction grating.

[0012] The present invention is a glittering moving image pattern characterized in that the glittering elements are in the form of lines, and the inside of the lines is made of a diffraction grating.

[0013] The present invention is a glittering moving image pattern characterized in that the glittering element is a blazed diffraction grating. [Effects of the Invention]

[0014] The glittering animation pattern of the present invention is not structured to move an image using a plurality of discontinuous images like a flip book, but has a structure that makes the image appear three-dimensional by sampling a portion of an image divided and compressed by an integral photography method using a semi-cylindrical image line or reflected or diffracted light from a diffraction grating. Therefore, the image is reproduced as a completely continuous image without any breaks, and is superior to conventional techniques in the stereoscopic expression of three-dimensional images.

[0015] Compared to traditional flip book-style 3D holograms, its unique structure makes it difficult to replicate a similar effect, making it highly effective at preventing counterfeiting.

[0016] Unlike the layer depth representation, which can be achieved by the conventional techniques of Patent Documents 5 and 6 and which only allows for perspective stereoscopic representation, it is possible to achieve a complete three-dimensional image, or a so-called full depth representation.

[0017] Compared to technologies that use lenticular or microarray lenses to sample a portion of a compressed image using the lens effect, this technology has high brightness and excellent visibility because it samples using specularly reflected light and diffracted light generated by luminous elements. [Brief explanation of the drawings]

[0018] [Figure 1] 1 shows a glittering moving image pattern according to the present invention. [Figure 2] 1 shows an outline of the basic configuration of the glittering moving image pattern of the present invention. [Figure 3] The configuration of the glittering element group in the present invention is shown below. [Figure 4] 1 shows the configuration of the glittering element in the present invention. [Figure 5] 1 shows a base image in the present invention. [Figure 6] 1 shows a latent image element in the present invention. [Figure 7] 1 shows a group of latent image elements in the present invention. [Figure 8] 1 shows the superposition of the glitter element group and the latent image element group in the present invention. [Figure 9] 1 shows a structure in which a glitter element and a latent image element are superimposed in the present invention. [Figure 10] The effect of the glittering moving image pattern of the present invention is shown. [Figure 11] 1 shows a glittering element in the present invention. [Figure 12] 1 shows an outline of the basic configuration of the glittering moving image pattern of the present invention. [Figure 13] The configuration of the glittering element group in the present invention is shown below. [Figure 14] 1 shows the configuration of the glittering element in the present invention. [Figure 15] 1 shows the configuration of the glittering element in the present invention. [Figure 16] 1 shows a base image in the present invention. [Figure 17] 1 shows a latent image element in the present invention. [Figure 18] 1 shows a group of latent image elements in the present invention. [Figure 19] 1 shows the superposition of the glitter element group and the latent image element group in the present invention. [Figure 20] The effect of the glittering moving image pattern of the present invention is shown. [Figure 21] 1 shows the layer structure of a glittering moving image pattern in the present invention. [Figure 22] 1 shows a prior art latent image element. [Figure 23] 1 shows a group of latent image elements in the prior art. [Figure 24] The effects of the prior art are shown. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following description will discuss embodiments of the present invention with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, and various other embodiments are also encompassed within the scope of the technical concept set forth in the claims.

[0020] The glittering dynamic pattern (3) of the present invention becomes a hologram if the glittering elements (6) are configured with diffraction gratings (7), and becomes a printed matter if the glittering elements (6) are configured with raised, kamaboko-shaped elements (kamaboko-shaped elements) by screen printing, etc. In this specification, we will mainly explain an example in which the glittering dynamic pattern (3) is configured as a hologram.

[0021] In this specification, a specific embodiment will be described in which the glittering element group (4) and the latent image element group (5) are holograms formed by a diffraction grating (7). When the glittering dynamic pattern (3) is in the form of a hologram, the glittering dynamic pattern (3) and the hologram-forming layer (15) are synonymous. A more practical embodiment can be achieved by subjecting the hologram-forming layer (15) to vapor deposition or protecting it with a transparent layer, but these are within the scope of common-sense applications of the present invention.

[0022] (First embodiment) First, Fig. 1 shows an attachment (1) of a glittering animated pattern (3) in which a line-type glittering animated pattern (3) of the present invention is attached. The attachment (1) of a glittering animated pattern (3) is an attachment (1) of a glittering animated pattern (3) attached to a substrate (2), and the substrate (2) to which the pattern is attached may be paper, plastic, metal, etc., and may be attached onto a printed matter with a base print.

[0023] In the first embodiment, the glittering elements (6) are in the form of lines (images), and the interior of the lines is filled with a diffraction grating (7). In the first embodiment, a configuration will be described in which the latent image (14) reproduced on the glittering moving image pattern (3) is a soccer ball, and the soccer ball is a three-dimensional image with a continuous three-dimensional effect.

[0024] As shown in Figure 2, the glittering moving image pattern (3) is composed of a combination of two element groups: a glittering element group (4) and a latent image element group (5) with optical properties different from those of the glittering element group (4). For simplicity of explanation, the glittering element group (4) and the latent image element group (5) are described as separate components, but the glittering element group (4) and the latent image element group (5) do not necessarily need to exist separately, and the glittering element group (4) and the latent image element group (5) may be integrated into one component, as will be described later in Figure 9(b).

[0025] Figure 3 shows the glittering element group (4). The glittering element group (4) consists of a collection of glittering elements (6). The glittering elements (6) are arranged regularly at a first pitch (P1) in a first direction (S1 direction). In this specification, "arranged regularly" means that multiple elements are arranged consecutively in the same direction with the same width and pitch. In the first embodiment, the glittering elements (6) are lines, and the line angle of the lines is 90 degrees, which is vertical.

[0026] The lustrous elements (6) constituting the lustrous element group (4) are highly reflective optical elements characterized by the function of continuously shifting the light-reflecting areas within the lustrous elements (6) as the angle of incident light changes. A structure in which the entire lustrous element (6) reflects light when light is incident from any direction does not satisfy the requirements for the lustrous elements (6) of the present invention. Examples of lustrous elements (6) that satisfy this characteristic include kamaboko-shaped elements that are glossy and have a raised height, and elements filled with diffraction gratings (7) whose angles, such as arc-shaped or concentric circles, change continuously.

[0027] In the first embodiment, the luminous element (6) is described as an optical element formed of a collection of arc-shaped diffraction gratings (7), but the configuration of the luminous element (6) is not limited to this. Figure 4 shows an example of the configuration of the diffraction grating (7) in the luminous element (6). All of these luminous elements (6) have the function of continuously moving the light-reflecting area in the luminous element (6) as the angle of incident light changes.

[0028] In this specification, "the light-reflecting area moves continuously" refers to a situation where, for example, assuming that light is incident on the luminous element (6) and a certain area of ​​the luminous element (6) reflects the light, when the angle of the incident light changes slightly, a completely different area separate from the area that was previously reflecting the light reflects the light (this is considered "discontinuous movement"), but rather, a region adjacent to the area that was previously reflecting the light reflects the light.

[0029] To achieve this, at least a portion of the diffraction grating of the luminous element (6) must have a structure in which the angle of the diffraction grating (7) changes continuously within a certain range, like the arc in Figure 3 or Figure 4(a), or even if the diffraction grating (7) is formed in a straight line as shown in Figure 4(b) and Figure 4(c), or even if the angle change is discontinuous, the angle difference between adjacent diffraction gratings (7) must be the smallest compared to the angle difference with other diffraction gratings (7) in the luminous element (6).

[0030] 3 is used for the diffraction grating (7) inside the glittering element (6) in the present invention, the arc rise angle is 10 degrees or more and 85 degrees or less (-10 degrees or more and -85 degrees or less at the opposite end) if it is a slit type, and more preferably 30 degrees or more and 80 degrees or less (-30 degrees or more and -80 degrees or less at the opposite end). If this angle is too small, the degree of rotation of the reproduced three-dimensional image will be small, and if it is too large, the diffraction gratings (7) will be likely to overlap at the ends, making it difficult to generate diffracted light, which is undesirable.

[0031] Next, the latent image element group (5) will be described. The glittering moving image pattern (3) of the present invention differs from the conventional technology in the configuration of the latent image element group (5). In the conventional technology described in Patent Document 5, the latent image element group (5) is configured with the aim of enhancing the moving image effect, whereas in the present invention, the aim is to enhance the three-dimensional effect of a three-dimensional image rather than the moving image effect, and therefore there is a significant difference in the configuration of the latent image element group (5).

[0032] The biggest difference between the present invention and the prior art is that there are as many base images (10) that form the basis of the latent image element group (5) as there are latent image elements (12). In the prior art, the base image (10) that forms the basis of the latent image element group (5) is a single image, and all latent image elements (12) are constructed using the exact same base image (10).

[0033] However, in the present invention, in order to make the reproduced latent image (14) a three-dimensional image, the base image (10) is a series of multiple images captured by visually observing a soccer ball (8), which is an actual three-dimensional structure, from multiple viewpoints (9), as shown in Figure 5.

[0034] For example, as shown in Figure 5, an image of a soccer ball (8), which is a three-dimensional structure, viewed from viewpoint 1 (91) is defined as the base image (101) of viewpoint 1 (91), an image viewed from viewpoint 2 (92) is defined as the base image (102) of viewpoint 2 (92), an image viewed from viewpoint 3 (93) is defined as the base image (103) of viewpoint 3 (93), an image viewed from viewpoint 4 (94) is defined as the base image (104) of viewpoint 4 (94), and an image viewed from viewpoint 5 (95) is defined as the base image (105) of viewpoint 5 (95). For simplicity of explanation, we have limited to five representative viewpoints, but in reality, there are as many viewpoints (9) and base images (10) as there are latent image elements (12).

[0035] Next, as shown in Fig. 6, for each of the original images (10) from the original image (101) to the original image (105), multiple frames (11) of the same size (W0) are applied to one original image (10), and the original images (101) to (105) that fit within the frames are each divided into multiple parts and extracted, and all compressed at the same rate in the first direction (S1 direction), so that all of the latent image elements (121) for the original image (101) to the latent image element 5 (125) for the original image (105) are the same size (W1). This operation is repeated for all of the original images (10) from the original image (101) to the original image (105), and the created latent image elements (12) for each of the latent image elements 1 (121) to 5 (125) are arranged with a specific pitch (P1) and in the order of the viewpoints observed at successive angles, thereby completing the latent image element group (5) shown in Fig. 7. This becomes the latent image element group (5) in the present invention.

[0036] The configuration of this latent image element group (5) is an application of integral photography, a method of capturing and reproducing three-dimensional images, and is a pseudo-reproduction of a multi-viewpoint image obtained by capturing an image of a three-dimensional object through a lenticular or microarray lens. However, unlike conventional integral photography, the image is reproduced using lenticular or microarray lenses used for capturing images, but using reflected light and diffracted light from the photoluminescent element group (4). Therefore, it is difficult to simply apply the multi-viewpoint image obtained by the integral photography method to the latent image element group (5), and a pseudo-reproduction method is used.

[0037] Furthermore, the three-dimensional structure that forms the basis of the base image (10) viewed from multiple viewpoints (9) is not limited to a tangible material in the real world; it is also possible to use computer graphics, etc., to calculate images of a virtually created object observed from multiple viewpoints (9) and use them as the base image (10).

[0038] By combining the glitter element group (4) and the latent image element group (5) configured as described above, the glitter moving image pattern (3) shown in Figure 8 is formed. In this invention, "combining the glitter element group (4) and the latent image element group (5)" refers to a configuration in which the latent image element group (5) and the glitter element group (4) overlap, and the diffraction grating (7) of the glitter element (6) does not exist in the area where the latent image element (12) and the glitter element (6) overlap, as shown in Figure 9(a). Furthermore, "integrating the glitter element group (4) and the latent image element group (5)" refers to a configuration in which the interior or outline of the latent image element (12) is originally formed by the diffraction grating (7) of the overlapping glitter element (6), and there is a latent image element (12) with a diffraction grating (7), but the diffraction grating (7) of the glitter element (6) does not exist around it, as shown in Figure 9(b).

[0039] Note that the diffraction grating (7) of the glittering element (6) should not be present inside the latent image element (12) in Figure 9(a) or around the latent image element (12) in Figure 9(b), but there is no problem if there is a diffraction grating (7) with an angle or density different from that of the diffraction grating (7) of the glittering element (6). What is important is to make the optical properties of the glittering element group (4) and the latent image element group (5) different, more specifically, to make the reflection properties and diffraction properties different.

[0040] The effect of the glittering dynamic pattern (3) having the above-described configuration will be explained using FIG. 10. As shown in FIG. 10(a), when light is incident from the left side on the affixed item (1) with the glittering dynamic pattern (3), a latent image (14) of a soccer ball (8), an actual three-dimensional structure, viewed from the left side is reproduced in the glittering dynamic pattern (3). The reproduced latent image (14) is not a conventional flat, two-dimensional image, but a three-dimensional image that allows the viewer to perceive a three-dimensional sense of volume. As shown in FIG. 10(b), when light is incident from directly above the affixed item (1) with the glittering dynamic pattern (3), a latent image (14) of a soccer ball (8), an actual three-dimensional structure, viewed from the front is reproduced as a three-dimensional image in the glittering dynamic pattern (3). As shown in Figure 10(c), when light is incident on the affixed object (1) with the glittering dynamic pattern (3) from the right side, a latent image (14) of a soccer ball (8), an actual three-dimensional structure, viewed from the right side is reproduced within the glittering dynamic pattern (3) as a three-dimensional image. Conversely, when the position of the light source (13) is fixed and the viewpoint (9) from which the glittering dynamic pattern (3) is viewed is changed, the glittering dynamic pattern (3) appears to rotate in response to changes in the viewpoint (9) as the observation angle changes left and right. Regardless of the angle from which it is viewed, the latent image (14) is perceived as a stereoscopic three-dimensional image, and therefore can be said to be a multi-view three-dimensional image.

[0041] The principle behind the above effect will be explained below. On the left side of the latent image element group (5), latent image elements (12) that are compressed versions of original images (10) of an actual soccer ball (8) viewed from the left side are arranged, and as you move toward the center of the latent image element group (5), latent image elements (12) that are compressed versions of original images (10) viewed from the front are arranged, and as you move to the right, latent image elements (12) that are compressed versions of original images (10) viewed from the right side are arranged. In addition, within each latent image element (12), the one on the left is an image located relatively to the left of the soccer ball (8), and the one on the right is an image located relatively to the right of the soccer ball (8).

[0042] In this configuration, when light is incident from the left onto the glittering moving image pattern (3) combined with the glittering elements (6), only the left side of each glittering element (6) strongly reflects light, and only the image on the left side of the latent image element (12) combined with this reflective surface is sampled. In this case, the image reproduced is the soccer ball (8) viewed from a viewpoint closer to the left. If light is incident from directly above, only the center of each glittering element (6) strongly reflects light, and only the image on the center of the latent image element (12) combined with this reflective surface is sampled. In this case, the image reproduced is the soccer ball (8) viewed from a viewpoint closer to the center. If light is incident from the right, only the right side of each glittering element (6) strongly reflects light, and only the image on the right side of the latent image element (12) combined with this reflective surface is sampled. In this case, the image reproduced is the soccer ball (8) viewed from a viewpoint closer to the right. Furthermore, the latent image (14) captured by the left eye is an image of the soccer ball seen from the left side, and the latent image (14) captured by the right eye is an image of the soccer ball seen from the left side. This creates a stereoscopic effect due to binocular parallax, similar to when viewing a real three-dimensional object, and the latent image (14) is reproduced as a three-dimensional image using a multi-view system. This is the principle behind the present invention, in which a three-dimensional image is reproduced within the photoluminescent stereoscopic image (3), and by changing the observation angle or the position of the light source (13), a latent image (14) with a correspondingly changed perspective can be seen.

[0043] In integral photography, a multi-viewpoint image corresponding to the latent image element group (5) of the present invention is sampled by the refraction of light from the lenticular or microlens array used to capture the multi-viewpoint image, and a three-dimensional image is reproduced. The present invention samples the latent image element group (5) corresponding to this multi-viewpoint image by the reflection and diffraction of light from the glitter element group (4), and a three-dimensional image is reproduced.

[0044] When the diffraction grating (7) in the photoluminescent element (6) is configured with a density of 500 lines per mm or more, the color of the latent image (14) or the surrounding background gradually changes and moves between different hues, such as blue, green, yellow, and red. When using a diffraction grating (7) to express color through diffracted light, a diffraction grating (7) with 500 lines per mm or more produces rainbow-colored diffracted light ranging from purple to red. Increasing the number of lines per mm in the diffraction grating (7) increases the diffraction angle of the diffracted light, thereby changing the angular range in which the diffracted light is visible. For example, if the diffraction angle of the first-order diffracted light produced by a diffraction grating (7) with a density of 500 lines per mm is approximately 10 degrees, then the diffraction angle of a diffraction grating (7) with 1000 lines will be approximately 20 degrees, and that of a diffraction grating (7) with 1500 lines will be approximately 40 degrees. This phenomenon can be used to control the hue of the diffracted light perceived by the observer. For example, when viewed from a specific angle where the first-order diffracted light of a diffraction grating (7) with 500 lines per mm appears red, a diffraction grating (7) with a density of 600 lines appears green, and one with 700 lines appears purple. As described above, by controlling the density of the diffraction grating (7), it is possible to select the hue of the diffracted light.

[0045] Next, as a second embodiment, an example in which the lustrous dynamic pattern (3) is composed of dots (pixels) instead of lines will be described. In the first embodiment, the lustrous dynamic pattern (3) has the effect of causing the latent image (14) to change in a rotating manner in response to angular changes in the left-right direction, but in the second embodiment, an example will be described in which changes in the up-down and diagonal directions are added to the left-right direction, thereby producing the effect of causing the latent image (14) to change in a rotating manner in response to any angular changes.

[0046] 11 shows a glittering moving image pattern (3) affixed to an object (1) having a dot-type glittering moving image pattern (3) of the present invention. The glittering moving image pattern (3) affixed to an object (1) has a glittering moving image pattern (3) affixed to a substrate (2), and the substrate (2) to which the pattern is affixed may be paper, plastic, metal, etc., and may be affixed onto a printed matter on which a base print has been applied.

[0047] In the second embodiment, the glittering elements (6) are dots, and the inside of the dots is filled with a diffraction grating (7). In the second embodiment, an embodiment will be described in which the image reproduced on the glittering moving image pattern (3) is a cube, and the cube is a three-dimensional image with a three-dimensional effect.

[0048] As shown in Figure 12, the glittering moving image pattern (3) is composed of a combination of two element groups: a glittering element group (4) and a latent image element group (5) with optical properties different from those of the glittering element group (4). For simplicity of explanation, the glittering element group (4) and the latent image element group (5) are described as separate configurations, but the glittering element group (4) and the latent image element group (5) do not necessarily need to exist separately, and the glittering element group (4) and the latent image element group (5) may be configured as an integrated unit, as explained in the example of the line in the first embodiment.

[0049] Figure 13 shows the glittering element group (4). The glittering element group (4) consists of a collection of dot-shaped glittering elements (6). The glittering elements (6) are regularly arranged at a first pitch (P1) in a first direction (S1 direction) and at a second pitch (P2) in a second direction (S2 direction). The first pitch (P1) and the second pitch (P2) may be different values ​​or may be the same value.

[0050] The dot-shaped glittering elements (6) that make up the glittering element group (4) are highly reflective optical elements characterized by the function of continuously moving the light-reflecting areas in the glittering elements (6) as the angle of incident light changes. A structure in which the entire glittering element (6) reflects light when light is incident from any direction does not satisfy the requirements of the glittering elements (6) of the present invention. These are the same functions required of the line-shaped glittering elements (6) in the first embodiment.

[0051] In addition, it is also possible to use dot-shaped glittering elements (6) printed with glossy dots and raised by screen printing or the like. Screen printing of dots with glossy ink can form high-gloss raised pixels with gently sloping raised areas, satisfying the requirements for glittering elements (6). However, in this second embodiment, as in the first embodiment, an example will be described in which the glittering elements (6) are configured with diffraction gratings (7). Examples of glittering elements (6) formed using diffraction gratings (7) include those filled with concentric circular or convergent linear diffraction gratings (7) whose angles change continuously, as shown in Figures 14(a) to 14(d). All of these glittering elements (6) have the function of continuously shifting the light-reflecting areas in the glittering elements (6) as the angle of incident light changes. However, when the glittering element group (4) is composed of the glittering elements (6) shown in Figures 14(a) to 14(d), there is a problem that two latent images (14) are always reproduced as a pair. In this case, the image that appears is a three-dimensional image, so the effect desired by the present invention can be achieved.

[0052] The reason for the appearance of two latent images (14) is that the photoluminescent elements (6) shown in Figures 14(a) to 14(d) are each composed of a diffraction grating (7) with a 360-degree angular range. When light is incident from one light source (13), two diffraction gratings (7) are present in one photoluminescent element (6) at angles perpendicular to the incident light, resulting in two light-reflecting regions, or so-called two bright spots. These two bright spots sample the latent image element group (5), resulting in the reproduction of two three-dimensional images. If light is incident on the photoluminescent moving image pattern (3) from two different light sources (13), four three-dimensional images will be reproduced; if light is incident from three different light sources (13), six three-dimensional images will be reproduced. This is the same as the prior art described in JP 2021-81705 A, where dots are composed of concentric diffraction gratings (7).

[0053] In order to obtain the effect of reproducing one three-dimensional image for one incident light beam using a luminous element (6) composed of a diffraction grating (7) with an angular range of 360 degrees as shown in Figures 14(a) to 14(d), it is necessary to use a special diffraction grating (7) such as a Fresnel structure or a blazed type having a cross-sectional structure with a specific inclination angle in the height direction of the diffraction grating (7) as shown in Figures 15(a) and 15(b). Alternatively, as shown in Figures 15(c) and 15(d), by forming dots with a diffraction grating (7) limited to an angular range of less than 180 degrees, it is possible to obtain the effect of reproducing one three-dimensional image for one incident light beam even when using a diffraction grating (7) with a normal cross-sectional structure.

[0054] Note that the dots in Figure 15(c) only change the angle of the diffraction grating (7), while the dots in Figure 15(d) change both the angle and density of the diffraction grating (7). Configuring the glittering elements (6) using both changes in angle and density, as in the dots in Figure 15(d), allows for smoother movement of the bright spots within the glittering elements (6), enhancing the effects of the present invention. In the second embodiment, an example will be described in which glittering elements (6) using the blazed diffraction grating (7) shown in Figure 15(b) are regularly arranged to form a glittering element group (4).

[0055] Next, the latent image element group (5) will be described. As in the first embodiment, the second embodiment differs from similar conventional techniques in the configuration of the latent image element group (5). Even in the dot form, there are as many original images (10) that form the basis of the latent image element group (5) as there are latent image elements (12). In the dot form, in the present invention, in order to make the reproduced latent image (14) a three-dimensional image, images of a cube, which is an actual three-dimensional structure, viewed from all multiple viewpoints (9) above, below, left, right, and diagonally are used as the original images (10) respectively, as shown in FIG.

[0056] As shown in FIG. 17, the original images (101, 102, 103, 104, 105, . . . 10) viewed from each viewpoint (9) are i 10 n), a frame (11) of a certain size is applied to the original image (10) and the original image (10) that fits within the frame (11) is divided and extracted, and compressed in the first direction (S1 direction) and the second direction (S2 direction), to form each latent image element (12). At this time, the aspect ratio of the frame (11) and the compression ratio of the original image (10) in the first direction (S1 direction) and the second direction (S1 direction) are set to values ​​that conform to the ratio P1:P2. By repeating this process and arranging multiple latent image elements (12) in the same regularity as the glitter element group (4), the latent image element group (5) shown in Figure 18 is completed. This becomes the latent image element group (5) in the form of dots in the present invention.

[0057] The glittering moving image pattern (3) is formed by combining the glittering element group (4) and the latent image element group (5) configured as described above as shown in Fig. 19. The definition and configuration of the combination are the same as those in the first embodiment.

[0058] The effect of the glittering dynamic pattern (3) having the above-described configuration will be explained using Figures 20(a) to 20(d). As shown in Figure 20(a), when light is incident from the front on the affixed object (1) with the glittering dynamic pattern (3), a latent image (14) of a cube viewed from the front is reproduced in the glittering dynamic pattern (3). The reproduced latent image (14) is not a flat, planar image as in the past, but a three-dimensional image that allows the observer to perceive a three-dimensional sense of volume. As shown in Figure 20(b), when the position of the light source (13) is fixed and the affixed object (1) with the glittering dynamic pattern (3) is observed from the bottom right, a latent image (14) of a cube viewed from the bottom right is reproduced as a three-dimensional image in the glittering dynamic pattern (3). As shown in Figure 20(c), when the affixed item (1) with the glittering dynamic pattern (3) is viewed from the upper right, a latent image (14) of a cube viewed from the upper right is reproduced as a three-dimensional image in the glittering dynamic pattern (3). As shown in Figure 20(d), when the affixed item (1) with the glittering dynamic pattern (3) is viewed from the upper left, a latent image (14) of a cube viewed from the upper left is reproduced as a three-dimensional image in the glittering dynamic pattern (3). As shown in Figure 20(e), when the affixed item (1) with the glittering dynamic pattern (3) is viewed from the lower left, a latent image (14) of a cube viewed from the lower left is reproduced as a three-dimensional image in the glittering dynamic pattern (3).

[0059] An example of a layer structure is shown in Figure 21, which assumes that the glittering moving image pattern (3) of the present invention will be attached to paper or printed matter. In this specification, only the glittering element group (4) and latent image element group (5), which are essential for the configuration of the glittering moving image pattern (3) of the present invention, have been specifically described. However, these are the minimum configuration of the hologram-forming layer (15), and it is within the scope of common sense applications of the present invention to apply a vapor deposition layer (16) or transparent reflective layer (17) to this configuration to increase brightness, to provide a protective layer (18) to increase durability, or to provide an adhesive anchor layer (19) or adhesive layer (20) to make it possible to attach it to a substrate (2).

[0060] In this specification, the configuration of the glittering element group (4) uses straight lines with no change in image angle for the line form and perfect circles for the dot form, but this is not limited to this. For example, the glittering element group (4) may be curved or a combination of curved lines and straight lines. In addition, the glittering elements (6) do not all need to have the same shape; as long as they have a pattern consistent with the latent image element group (5), the individual glittering elements (6) may have different shapes. For example, if the glittering elements (6) are configured with curved lines, the configuration of the base image (10) of the present invention can be applied to the latent image element group (5) of Japanese Patent No. 6,032,423. If the glittering elements (6) are configured with a combination of straight lines and curved lines, the configuration of the base image (10) of the present invention can be applied to Japanese Patent No. 6,112,357 or Japanese Patent No. 6,412,8576.

[0061] However, since binocular parallax is one of the conditions for reproducing a three-dimensional image with a sense of depth, whether the line is straight, curved, or a combination of these, it is desirable for the line angle to be between 60 and 120 degrees, with vertical being 90 degrees. If this angle range is exceeded, the tilt of the rotation axis of the latent image (14) becomes too great, significantly reducing the sense of depth achieved by utilizing binocular parallax. Furthermore, in addition to representing the latent image (14) as a three-dimensional image, it is also possible to impart the effect of changing it into a different three-dimensional image. The configuration of the base image (10) of the present invention can be applied to the configuration of the latent image element group (5) used in Japanese Patent Publication No. 6,032,426. Furthermore, to change the rotation direction of an image at a specific angle, the configuration of the base image (10) of the present invention can be applied to the configuration of the latent image element group (5) described in Japanese Patent Publication No. 6,361,978. Furthermore, if the configuration of the base image (10) of the present invention is applied to the configuration of the latent image element group (5) described in Japanese Patent No. 6516262, it is possible to obtain the effect of making a three-dimensional image appear to fluctuate. The above patent group can obtain its effect by combining it with the prior art technology described in Japanese Patent Laid-Open No. 2021-81705, but when functioning as a three-dimensional image, applying the configuration of the base image (10) of the present invention makes it possible to obtain a wider variety of effects.

[0062] When the photoluminescent element group (4) is composed of a diffraction grating (7), it is desirable that the line width and pitch be 10 μm or more and 500 μm or less. It is desirable that the dot diameter and pitch be 10 μm or more and 500 μm or less. This is because if the dot diameter exceeds 500 μm, it becomes easy to reproduce by printing and resistance to counterfeiting decreases. If the dot diameter is less than 10 μm, it becomes difficult to impart sufficient angle change and density to the diffraction grating (7), and it becomes difficult to draw the latent image element group (5) with a certain resolution even when using an electron beam drawing device.

[0063] In this specification, the photoluminescent element group (4) and the latent image element group (5) have been described as being formed by the configuration of the diffraction grating (7) or the presence or absence thereof, but the configuration of the photoluminescent moving image pattern (3) is not limited to a hologram configuration based on the diffraction grating (7). Since the prior art of Patent No. 5200284 is a technology that is primarily based on printing, the photoluminescent element group (4) may be formed as convex lines (semi-cylindrical elements) or convex pixels having light-dark flip-flop properties or color flip-flop properties by screen printing, intaglio printing, flexo printing, etc., while the latent image element group (5) may be formed by screen printing, flexo printing, gravure printing, offset printing, letterpress printing, etc. using a material with a lower reflectivity than the photoluminescent element group (4). The luminous element (6) only needs to have the function of continuously moving the light-reflecting area in the luminous element (6) in response to changes in the angle of the incident light, and the latent image element group (5) can be formed using any device, method, or means as long as it has optical properties different from those of the luminous element (6).

[0064] Brightness flip-flop is an optical property in which brightness increases upon specular reflection, while color flip-flop is a property in which the hue changes upon specular reflection. When constructing the glitter element group (4) by printing, it is desirable for the line width and pitch to be between 100 μm and 1 mm, and for dots, it is desirable for the line width to be between 100 μm and 1 mm. Regarding height, it is desirable for it to be at least 2 μm, and there is no particular upper limit, but considering distribution suitability, it is practical to keep it at 100 μm or less.

[0065] In this invention, a line (image line) refers to a dotted line, a broken line, a straight line, a curved line, a broken line, etc., which are small dots that are the smallest unit that form each image and are arranged continuously for a certain distance in a specific direction, and a dot (pixel) refers to various shapes such as a circle, triangle, polygon including a square, star, etc., which are small dots that are the smallest unit that form each image, or a group of small dots that are grouped together, or letters, symbols, numbers, etc.

[0066] (Comparative Example) Here, a method for producing the latent image element group (C) of the prior art technique described in JP-A-2021-81705 and its effects will be described as a comparative example.

[0067] In conventional technology, the original images (A) that form the basis of the latent image elements (B) are all the same image. The soccer balls that are the original images (A) shown in Figure 22 are all images that can be observed when a flat, two-dimensional soccer ball is viewed from the front, and when forming any of the latent image elements (B), the same original image (A) is used and compressed in the first direction (S1 direction) as shown in Figure 23 to form latent image elements (B), and latent image element groups (C) are formed by regularly arranging the latent image elements (B).

[0068] The effect of the conventional technology is shown in Figure 24. When light is incident from the left, as shown in Figure 24(a), the latent image of the soccer ball is reproduced on the left side. When light is incident from directly above, as shown in Figure 24(b), the latent image of the soccer ball is reproduced in the center. When light is incident from the right, as shown in Figure 24(c), the latent image of the soccer ball is reproduced on the right side. As described above, although a moving image effect of the soccer ball moving left and right is produced, the latent image that appears in either case is a flat, two-dimensional image without any sense of depth. [Explanation of symbols]

[0069] 1. Photo-luminescent video pattern stickers 2 Base material 3. Luminous video patterns 4 Photoluminescent element group 5 Latent image element group 6 Photoluminescent elements 7 Diffraction Grating 8 Actual three-dimensional object 9 Perspectives 10 images 11 frames 12 Latent Image Elements 13 Light source 14 Latent Image 15 Hologram forming layer 16 Deposited layer 17 Transparent reflective layer 18 Protective layer 19 Adhesive anchor layer 20 Adhesive layer

Claims

1. A glittering moving image pattern formed by combining or integrating a glittering element group with a latent image element group having optical properties different from those of the glittering element group, wherein the glittering element group is formed by arranging a plurality of diffraction gratings with a regularity, the diffraction gratings having a function of continuously moving areas that reflect light as the angle of incident light changes, and the latent image element group is formed by dividing and compressing a plurality of base images of a three-dimensional structure captured successively from viewpoints at different observation angles, and arranging the plurality of latent image elements with the same regularity as the glittering element group in the order of the viewpoints captured successively from the different observation angles, and wherein under specular reflection light, the glittering element group samples and visualizes only a portion of the latent image element group, thereby causing a three-dimensional image of the three-dimensional structure to appear, and the three-dimensional image can be viewed stereoscopically as the observation angle changes.

2. 2. The glittering moving image pattern according to claim 1, wherein the glittering elements are in the form of dots, and the interior of the dots is made up of a diffraction grating in the form of concentric circles or converging lines.

3. 2. The glittering moving image pattern according to claim 1, wherein the glittering elements are linear, and the interior of the linear elements is made of a diffraction grating.

Images