Brilliant video pattern forming body

Abstract

To provide a hologram which is characterized in that a reflection pattern has holographic visual effects and represents a technology that enables addition of a transparent pattern different from the reflection pattern of the hologram, and also characterized in that the transparent pattern does not obstruct the reflection pattern, enabling addition of both of highly visible reflection and transparent patterns without sacrificing the other of these.SOLUTION: Provided is a photoluminescent moving-image pattern forming substance characterized in that a photoluminescent moving-image pattern composed of a combination of a photoluminescent element group and a latent image element group having different optical characteristic than the photoluminescent element group, with a different pattern visually recognized under reflected light and under transmitted light.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a hologram in the field of security prints such as banknotes, passports, securities, identity certificates, cards, tickets, etc. that require anti-counterfeiting effects, in which a pattern that appears under reflected light produces a dynamic visual effect, and a different pattern from the pattern that appears under reflected light appears under transmitted light.

Background Art

[0002] Image change effects where multiple images switch and video effects where the image appears to move have high eye-catching properties and are difficult to counterfeit. Therefore, in recent years, they have been increasingly used as authenticity discrimination elements for security prints. A typical technology with this change effect is a hologram, which is also widely used by being attached to security prints such as banknotes and passports that require the highest level of security.

[0003] In the initial holograms, the original plate was produced by a photographing method in which object light from an object and reference light were burned onto a dry plate in the form of interference fringes. Currently, there are many holograms in a form in which the original plate is produced by a method of arranging fine diffraction gratings corresponding to the halftone dots of a printed matter as dots in an image plane to form an arbitrary image, typified by the dot matrix method. There are also types of holograms different from the dot matrix method in which the diffraction grating is rotated and moved to draw in the form of a line drawing to form an arbitrary image. Furthermore, by drawing the diffraction grating with an electron beam, higher accuracy than conventional dot matrix holograms is achieved, and a detailed image expression is possible.

[0004] Thus, there are currently a wide variety of holograms, among which there are not only images that simply appear in the hologram, but also special holograms with special authentication and discrimination functions. For example, by observing the hologram through a transparency (hereinafter referred to as "observing under transmitted light"), the hologram itself or a hidden pattern applied to its base appears, and a hologram for performing authenticity discrimination using this as a discrimination criterion is disclosed (see, for example, Patent Document 1 and Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The hologram described in Patent Document 1 is to see through the pattern applied to the base material of the hologram by making fine perforations in the metal film on the surface of the hologram. By observing the hologram under transmitted light, the underlying pattern that can be seen through is used as a criterion for authenticity discrimination. Also, the hologram described in Patent Document 2 directly applies a pattern to the hologram by removing the metal film on the surface of the hologram in the same way as the technology described in Patent Document 1. By observing under transmitted light, the pattern applied to the hologram itself can be seen through, and this is used as a criterion for authenticity discrimination. Both holograms are technologies that use the pattern observed under transmitted light (hereinafter referred to as "transmitted pattern") as a criterion for authenticity discrimination.

[0007] However, the technologies described in Patent Document 1 and Patent Document 2 are both configured to impart a transmission pattern by removing a part of the pattern of the original hologram composed of a diffraction grating. Since the pattern observed under reflected light (hereinafter referred to as the "reflection pattern") and the transmission pattern are different images that are not correlated with each other, if a transmission pattern is imparted, the reflection pattern will be deleted thereby, making it more difficult to view. Therefore, when limited to a configuration that does not affect the visibility of the reflection pattern, the visibility of the transmission pattern is not sufficient, and when the visibility of the transmission pattern is sufficient, there is a problem that the visibility of the reflection pattern is lowered.

[0008] In addition, the technology of Patent Document 2 has a major problem that when the visibility of the transmission pattern is finished at a level that can be authenticated by everyone, the transmission pattern is mixed in the reflection pattern and simultaneously visible, so that the transmission pattern that should be invisible under reflected light is visible.

[0009] The present invention aims to solve the above problems, and is characterized in that the reflection pattern has a dynamic visual effect. In addition, it is a technology capable of imparting a transmission pattern different from the reflection pattern of the hologram, and the transmission pattern does not inhibit the reflection pattern, and it is characterized in that it is possible to impart both a highly visible reflection pattern and a transmission pattern.

Means for Solving the Problems

[0010] A phosphorescent moving image forming body including a phosphorescent element group and a latent image element group, wherein the phosphorescent element group is formed by arranging a plurality of phosphorescent elements regularly, the phosphorescent element is composed of a diffraction grating on which a plurality of grating lines are arranged and a metal film covering the diffraction grating, and has a structure in which a region reflecting light in the phosphorescent element moves continuously due to a change in the angle of incident light on the grating lines; the latent image element group does not include a diffraction grating, is divided into a first latent image element group and a second latent image element group, one of them does not include the metal film, and the other includes the metal film. Further, the latent image element group is composed of: 1) a first latent image element group in which a plurality of first latent image elements obtained by compressing a base image are arranged regularly with at least one of the arrangement direction or arrangement pitch of the phosphorescent elements being different, and a second latent image element group in which a plurality of second latent image elements obtained by compressing a base image that is the same as or different from the base image are arranged regularly with at least one of the arrangement direction or arrangement pitch of the phosphorescent elements being different, or 2) a first latent image element group in which a plurality of first latent image elements obtained by dividing and compressing a base image are arranged regularly with the same regularity as the regularity of the arrangement direction or arrangement pitch of the phosphorescent elements, and a second latent image element group in which a plurality of second latent image elements obtained by dividing and compressing a base image that is the same as or different from the base image are arranged regularly with the same regularity as the regularity of the arrangement direction or arrangement pitch of the phosphorescent elements. Under reflected light, a first moving image pattern formed by the first latent image elements and a second moving image pattern formed by the second latent image elements appear, and depending on the viewing angle, the positions of the first moving image pattern and the second moving image pattern change and are visually recognized. Under transmitted light, a transmission pattern of an element group that does not include the metal film in either the first latent image element group or the second latent image element group is visually recognized. This is a phosphorescent moving image forming body characterized by this.

[0011] The present invention is a phosphorescent moving image forming body characterized in that the phosphorescent element is dot-shaped and the grating lines are arranged concentrically and / or convergently linearly.

[0012] The present invention is characterized in that the luminous element is linear, and at least one of the arrangement angle or density of the grid lines has a continuously changing structure, and it is a luminous moving image pattern forming body.

Advantages of the Invention

[0013] In the present invention, the reflection pattern that appears under reflected light has a moving image visual effect, and in addition, a transmission pattern different from the reflection pattern can be imparted. Further, since the transmission pattern is constituted by the pattern necessary for constituting the reflection pattern, the transmission pattern does not inhibit the visibility of the reflection pattern. If the visibility of the transmission pattern is improved, the visibility of the reflection pattern is also improved simultaneously.

[0014] One of the effects of the present invention, the moving image effect generated in the reflection pattern, is highly effective as a visual effect and attracts people's attention compared with the simple effect of a pattern appearing or changing. Also, certain knowledge is required for reproduction, and the resistance to forgery is relatively high.

Brief Description of the Drawings

[0015]

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Mode for Carrying Out the Invention

[0016] The mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the mode for carrying out described below, and includes various other modes within the scope of the technical idea described in the claims.

[0017] First, the iridescent moving image pattern (3) will be described. The iridescent moving image pattern (3) is generally called a hologram or an OVD (Optical Variable Device) and has a structure mainly composed of a diffraction grating (18). In this specification, the iridescent moving image pattern (3) will be described on the premise that it has a structure including a diffraction grating (18) formed of resin as a hologram forming layer (12) and a metal film (13) of a metal having no light transmissivity. This iridescent moving image pattern (3) may be attached to a substrate (2) having light transmissivity such as paper or plastic, or may be attached onto a printed matter with a printed background. When attached to a substrate (2) that does not transmit light like metal, the effects of the present invention are not exhibited, so it is not suitable.

[0018] (First Embodiment) First, FIG. 1 shows a printed matter (1) to which a slit-type iridescent moving image pattern (3) in the present invention is attached to a substrate (2) having light transmissivity. The iridescent moving image pattern (3) has a configuration including at least a hologram forming layer (12) and a metal film (13). Under reflected light, a moving image pattern (4) that produces a moving visual effect is visualized and recognized. As a preferred form, the moving image pattern (4) has a first moving image pattern (4-1) and a second moving image pattern (4-2). In this first embodiment, the moving image pattern (4) is formed by the first moving image pattern (4-1) and the second moving image pattern (4-2). However, as long as the latent image element group does not include a metal film, different information can be confirmed under reflected light and transmitted light. Therefore, the iridescent moving image pattern (3) of the present invention may be formed only in a configuration where the latent image element group does not include a metal film.

[0019] Fig. 2 shows an overview of the configuration of the luminous video pattern (3). The luminous video pattern (3) includes a luminous element group (5) and a latent image element group (6). The latent image element group (6) serves as a basis for an image that reproduces the video pattern (4) by interfering with the luminous element group (5). The latent image element group (6) is divided into a first latent image element group (6-1) that functions to reproduce the first video pattern (4-1) and a second latent image element group (6-2) that functions to reproduce the second video pattern (4-2). The video pattern (4) that was visually recognized as a perfect circle under reflected light is a moiré pattern reproduced by the interference between the latent image element group (6) and the luminous element group (5). The principle of moiré pattern generation will be described later. In this specification, the luminous element group (5) has a structure including a metal film (13) deposited on a hologram forming layer (12) containing a diffraction grating (18) formed of resin.

[0020] Fig. 3 shows the configuration of the luminous element group (5). The luminous element group (5) is formed by linearly arranged luminous elements (7) having regularity at a specific reference pitch (P0) in the first direction (S1 direction). The term "arranged with regularity" in this specification means arranging a plurality of elements continuously in the same width, at the same pitch, and in the same direction. Regarding the width of the luminous element (7) in the first direction (S1 direction), any size is acceptable as long as it is less than or equal to the reference pitch (P0). However, the effect of the present invention is highest when the width of the line is the same value as the reference pitch (P0). The enlarged view in the lower right of Fig. 3 shows the diffraction grating (18) inside the luminous element (7). The luminous element (7) in the first embodiment is composed of a diffraction grating (18) in which a plurality of arc-shaped grating lines (8) formed by continuous curves are arranged. However, the configuration of the diffraction grating (18) inside the luminous element (7) is not limited to this. In this specification, each groove forming the diffraction grating (18) is called a grating line (8).

[0021] The grating lines (8) of the diffraction grating (18) inside the luminescent element (7) in the first embodiment will be described using a form in which a part of the grating lines (8) has a structure in which the angle of the grating lines (8) continuously changes. The grating lines (8) can be straight or curved. When using the arc shown in FIG. 3, the arc rising angle should be 10 degrees or more and 85 degrees or less (if it is the opposite end, -10 degrees or more and -85 degrees or less) for the slit type, and more preferably 30 degrees or more and 80 degrees or less (if it is the opposite end, -30 degrees or more and -80 degrees or less). If this angle is too small, the magnitude of the movement of the moving image pattern (4) becomes small. If it is too large, the grating lines (8) of the diffraction grating (18) are likely to overlap, making it difficult to generate diffracted light, which is not desirable.

[0022] As an example, FIG. 4 shows an example of the configuration of the diffraction grating (18) of the luminescent element (7). The diffraction grating (18) in FIG. 4(a) is formed by arranging a plurality of straight grating lines (8) with slightly different angles for each of a plurality of cells (7a) obtained by dividing the luminescent element (7) in the vertical direction, thereby pseudo-reproducing the structure of an arc-shaped diffraction grating (18) similar to that in FIG. 3. The angle corresponding to the arc rising angle of the grating lines (8) in this example is approximately 80 degrees. The diffraction grating (18) in FIG. 4(b) is formed by arranging a plurality of straight grating lines (8) with slightly different angles concentrated linearly for each of a plurality of cells (7a) obtained by dividing the luminescent element (7) in the horizontal direction. The rising angle of the grating lines (8) in this example is approximately -80 degrees. When it is not arc-shaped, a negative angle is not a problem.

[0023] The diffraction grating (18) in FIG. 4(c) has a structure in which a part of the grid lines (8) of an arc or a curve is cut out for each of a plurality of cells (7a) obtained by horizontally partitioning the luminance element (7). In this example, the arc rising angle of the grid lines (8) is about 80 degrees. As described above, the diffraction grating (18) in the luminance element (7) may have a structure in which the angle of the grid lines (8) continuously changes within a certain range at least in part. It is desirable that the magnitude of the angle change be 30 degrees or more and 180 degrees or less. For example, in the example of FIG. 4(a), if the arc rising angle at the left end is 80 degrees, the center is 0 degrees, and the angle at the right end is -80 degrees, the angle change is 160 degrees. If the change in this angle is too small, the function of continuously moving the region that reflects light in the luminance element (8) due to the change in the angle of the incident light deteriorates, and the video effect of the video pattern (4) becomes low. Conversely, if the change in the angle is too large, the visibility of the video pattern (4) becomes low. Note that in FIG. 4, the grid lines (8) are arranged in a concentrated line and arc shape for each of the plurality of cells (7a), but the grid lines (8) may be arranged in a concentrated line and arc shape for the entire luminance element (7) without dividing it into a plurality of cells (7a).

[0024] Also, although the structure in which the arrangement angle of the grid lines (8) gradually changes within the luminance element (7) as shown in FIG. 2 has been described for the luminance element (7), the structure of the grid lines (8) of the luminance element (7) of the present invention is not limited to this, and a structure in which the density of the grid lines (8) changes may be used. For example, as shown in FIG. 19(a), a configuration in which the density of the grid lines (8) in the luminance element (7) changes stepwise from coarse to dense or from dense to coarse may be used. As shown in FIG. 19, even when the density of the grid lines (8) changes, an effect of continuously moving the region that reflects light in the luminance element (8) is produced. The density of the grid lines (8) is preferably designed in the range of 200 lines / mm to 5000 lines / mm, and more preferably in the range including 500 lines / mm to 2000 lines / mm.

[0025] Also, as shown in FIGS. 19(b), 19(c), and 19(d), although the interior of the luminescent element (7) is divided into minute line units (7a) of a constant width and the density of the grid lines (8) inside each minute line is the same, the density of the grid lines (8) between the respective minute lines is different. The density of the grid lines (8) of the minute lines adjacent to each other in the first direction (S1 direction) in the luminescent element (7) may be configured to gradually increase or decrease stepwise with a directionality from coarse to dense or from dense to coarse. In any case, as long as the luminescent element (7) has the effect that the region reflecting the light in the luminescent element (7) continuously moves due to the change in the incident light angle, the configuration of the grid lines (8) may be any configuration.

[0026] FIG. 5 illustrates the effect that occurs when the angle of the incident light changes with respect to the luminescent element (7) having the above-described structure. As shown in FIG. 5(a), when light is incident on the luminescent element (7) from the light source (11) on the left, the surface (7a) where each luminescent element (7) strongly reflects the light is on the left side of the luminescent element (7). As shown in FIG. 5(b), when light is incident on the luminescent element (7) from the light source (11) in the center, the surface (7a) where each luminescent element (7) strongly reflects the light is in the center of the luminescent element (7). As shown in FIG. 5(c), when light is incident on the luminescent element (7) from the light source (11) on the right, the surface (7a) where each luminescent element (7) strongly reflects the light is on the right side of the luminescent element (7).

[0027] As described above, as the light source (11) moves in the first direction (direction S1), the surface (7a) that strongly reflects the light in the luminescent element (7) also continuously moves in the same first direction (direction S1). Note that the moving direction of the light source (11) and the moving direction of the surface (7a) of the luminescent element (7) that strongly reflects light do not have to be the same, and it is not a problem if they move in the opposite direction. That is, the diffraction grating (18) in the luminescent element (7) has a structure in which the angle or density of the grating lines (8) continuously changes, so that due to the change in the angle of the incident light, an effect is produced in which the region that reflects the light in the luminescent element (7) continuously moves. Conversely, when light is incident from an arbitrary direction, a structure in which the entire luminescent element (7) reflects light does not satisfy the requirements of the present invention.

[0028] The effect that the region that reflects the light in the luminescent element (7) continuously moves due to the change in the angle of the incident light, which the luminescent element (7) of the present invention has, is essential for obtaining the moving image effect of the present invention. As described above, the luminescent moving image pattern (3) of the present invention must have a structure in which the angle of the grating lines (8) continuously changes within a certain range in at least a part of the diffraction grating (18) of the luminescent element (7).

[0029] Subsequently, the latent image element group (6) will be described with reference to FIG. 6. The latent image element group (6) is divided into a first latent image element group (6-1) and a second latent image element group (6-2). The difference in the configuration between the first latent image element group (6-1) and the second latent image element group (6-2) is the presence or absence of the metal film (13), but by devising the line drawing configuration of each latent image element group (6-1, 6-2), the moving image effect can be made more diverse. As an example, an example will be described using a configuration that imparts a special visual effect in which the first moving image pattern (4-1) and the second moving image pattern (4-2) move in opposite directions in the line drawing configurations of the first latent image element group (6-1) and the second latent image element group (6-2).

[0030] First, the line pattern of the first latent image element group (6-1) will be described. First, an image that serves as the basis for the image to be reproduced as the moving image pattern (4), in this specification, this is referred to as the reference image (9). In the first embodiment, the image to appear is a perfect circle. This reference image (9) is compressed in the first direction (S1 direction), which is the arrangement direction of the phosphorescent elements (7), to form the first latent image element (10-1). The degree of compression of the first latent image element (10-1) needs to be set to a width that is at least narrower than the pitch (P1, P2) to be arranged. A plurality of these first latent image elements (10-1) are arranged regularly in the first direction (S1 direction), which is the same as the arrangement direction of the phosphorescent elements (7), at a specific first pitch (P1). When the value of the reference pitch (P0), which is the arrangement pitch of the reference phosphorescent elements (7), is set to 100, the values of the first pitch (P1) and the second pitch (P2) need to be set to numerical values within the range of 80% to 120% excluding 100%. In this example, the first pitch (P1) is set to a value slightly larger than the reference pitch (P0).

[0031] Subsequently, the line pattern of the paired second latent image element group (6-2) will be described. The second latent image element group (6-2) has a plurality of second latent image elements (10-2) arranged regularly in the first direction (S1 direction), which is the same as the arrangement direction of the phosphorescent elements (7), at a specific second pitch (P2). Assuming that the first pitch (P1) of the first latent image element group (6-1) is set to a value larger than the reference pitch (P0), it is desirable to set the second pitch (P2) to a value smaller than the reference pitch (P0). This is a device for making the moving directions of the first moving image pattern (4-1) and the second moving image pattern (4-2), which are reproduced when light is reflected and produce a moving image effect, opposite to each other.

[0032] Also, this time, the video pattern (4) is a perfect circle and a symmetric image. However, if a non-symmetric image is used and the values of the first pitch (P1) and the second pitch (P2) are set to be larger than the reference pitch (P0), when compressing the base image (9), it is necessary to mirror-invert the base image (9) about an axis perpendicular to the first direction (S1 direction). This is because when the arrangement pitch (P2) of the second latent image element (10-2) is larger than the reference pitch (P0), the reproduced video pattern (4) will be an image obtained by mirror-inverting the base image (9). To prevent this, it is necessary to mirror-invert the base image (9) in advance.

[0033] In addition, in this specification, the first latent image element (10-1) and the second latent image element (10-2) are formed by the same base image (9), but they may also be formed by different base images (9).

[0034] By combining the group of luminescent elements (5) and the group of latent image elements (6) configured as described above, a luminescent video pattern (3) is formed. In the present invention, "combining the group of luminescent elements (5) and the group of latent image elements (6)" means that, as shown in Fig. 16(a), the group of latent image elements (6) and the group of luminescent elements (5) overlap, and in the region where the latent image element (10) and the luminescent element (7) overlap, there is no diffraction grating (18) derived from the luminescent element (7). Also, "the group of luminescent elements (5) and the group of latent image elements (6) are integrated" means that, as shown in Fig. 16(b), the inside and contour of the latent image element (10) are originally constituted by the diffraction grating (18) of the overlapping luminescent element (7), and there is a latent image element (10) having a diffraction grating (18), but there is no diffraction grating (18) of the luminescent element (7) around it.

[0035] Next, the cross-sectional configurations of the luminescent element group (5) and the two latent image element groups (6) are shown in FIG. 7. The luminescent element (7) has at least a diffraction grating (18) and a metal film (13). The first latent image element group (6-1) has at least the metal film (13), but no grating lines (8) are engraved and it does not have a diffraction grating (18) (the first latent image element group (6-1) is formed by the metal film (13)). On the other hand, the second latent image element group (6-2) does not have at least the metal film (13) and may or may not have a diffraction grating (18). In this first embodiment, it is in a form without a diffraction grating (18). What is important is that either one of the regions corresponding to the latent image element groups (6) of the first latent image element group (6-1) and the second latent image element group (6-2) does not have the metal film (13), and the other has the metal film (13).

[0036] The second latent image element group (6-2) is configured to remove the metal film (13) or not to deposit it in the first place. When removing the metal film, it can be formed by irradiating a laser with a wavelength corresponding to the absorption wavelength band of the metal film or by a method of partially removing the metal film (13) with a chemical such as an acid or an alkali (demetallization process). Also, when the second latent image element group (6-2) has a diffraction grating (18), a configuration of a diffraction grating (15) in which grating lines (8) having the same pattern as the luminescent element (7) are engraved may be used inside the second latent image element group (6-2). In this embodiment, the first latent image element group (6-1) has the metal film (13) and the second latent image element group (6-2) does not have the metal film (13), but this may be reversed. In addition, in this first embodiment, the first latent image element group (6-1) and the second latent image element group (6-2) are arranged separately in the vertical direction, but they may be arranged separately in the horizontal direction instead of the vertical direction.

[0037] The effects of the present invention under reflected light will be described. First, light is incident on the phosphorescent moving image pattern (3), and the effects visible in the situation where diffracted light is generated under reflected light are shown in FIG. 8. As shown in FIG. 8(a), when light is incident from a light source (11) existing in a certain direction, two moving image patterns (4-1, 4-2) appear in the phosphorescent moving image pattern (3). Subsequently, as shown in FIG. 8(b), when the position of the light source (11) changes, among the two moving image patterns (4-1, 4-2) that have appeared in the phosphorescent moving image pattern (3), one moves in the first direction (S1 direction), and the other moves in the direction opposite to the first direction (S1 direction). As shown in FIG. 8(c), when the position of the light source (11) changes, among the two moving image patterns (4-1, 4-2) that have appeared in the phosphorescent moving image pattern (3), one further moves in the first direction (S1 direction), and the other further moves in the direction opposite to the first direction (S1 direction). As described above, as the angle between the light source (11) and the phosphorescent moving image pattern (3) changes, a moving image effect of moving in the S1 direction and the direction opposite to the S1 direction occurs in the two moving image patterns (4-1, 4-2) in the phosphorescent moving image pattern (3). Also, the fact that these two moving image patterns (4-1, 4-2) appear to have the same density visually and cannot be distinguished at a glance is one of the special effects of the present invention.

[0038] Next, the effect in which a transmission pattern appears under transmitted light, which is another feature of the phosphorescent moving image pattern (3) of the present invention, will be described with reference to FIG. 9. When the phosphorescent moving image pattern (3) is observed under transmitted light, the first latent image element group (6-1) blocks light, and the second latent image element group (6-2) transmits light. In the present invention, since the phosphorescent element group (5) also has a configuration that blocks light, when the phosphorescent moving image pattern (3) is seen through, an effect of transmitting light only through the second latent image element group (6-2) occurs.

[0039] The principle that causes the above effects will be described. When the light-emitting element group (5) reflects light under reflected light, while extremely strong light is generated by the strong diffracted light derived from the diffraction grating, the latent image element groups (6-1, 6-2) do not emit diffracted light, so the light they reflect is relatively extremely small. Therefore, when light is incident on the light-emitting moving image pattern (3), strong light and darkness are generated by the light-emitting element group (5) and the latent image element groups (6-1, 6-2). When light is incident on the light-emitting element group (5), each latent image element (10-1, 10-2) does not emit diffracted light uniformly from the entire surface. As shown in FIG. 5, only the part where the angle of the grating line (8) of the internal diffraction grating (18) is orthogonal to the incident light emits diffracted light.

[0040] In this case, diffracted light is regularly generated in a thin strip shape from the light-emitting element group (5) at a period of a specific reference pitch (P0). Due to the strong diffracted light generated in a strip shape at this specific reference pitch (P0), the latent image element groups (6-1, 6-2) are periodically sampled and visualized, and as a result, two moving image patterns (4-1, 4-2) are visualized. The reason why the moving image pattern (4) is reproduced from the latent image element group (6) which are completely different images is that a special phenomenon called Moire Magnification (hereinafter referred to as "moire magnification phenomenon") occurs due to the interference between the light-emitting element group (5) and the latent image element group (6).

[0041] The latent image element groups (6-1, 6-2) with different layer structures appear to have the same density under reflected light, and the effect that the different layer structures cannot be immediately distinguished is due to the strong diffracted light derived from the combination of the diffraction grating (18) and the metal film (13) of the light-emitting element group (6), the moving image patterns (4-1, 4-2) are reproduced, and the difference in only the presence or absence of the metal film (13) does not have a visually noticeable effect on the visibility of the moving image patterns (4-1, 4-2). On the other hand, as the configuration of the second latent image element group (6-2), there is also a form that has a diffraction grating (18) and does not have a metal film (13). In this case as well, as a result, the two moving image patterns (4-1, 4-2) are visually recognized to have the same density, and the effect that the different layer structures cannot be immediately distinguished can be obtained.

[0042] Also, as the angle of the incident light changes, as shown in FIG. 5, the region that emits strong diffracted light in the group of phosphorescent elements (5) moves. As a result, the position of the latent image element group (6) to be sampled also changes, and as a result, the positions of the resulting video patterns (4-1, 4-2) change, producing a video-like visual effect. This is the principle by which, in the present invention, a video pattern (4), which is a pattern completely different from the latent image element group (6), is reproduced, and an effect is produced such that the video pattern (4) appears to move in response to a change in the angle of the incident light.

[0043] By using this moiré magnification phenomenon, various patterns can be magnified and made to appear to move. By applying this configuration, video effects rich in various variations can be reproduced. Specific examples of the moiré magnification phenomenon will be described later.

[0044] Subsequently, the principle by which a transmission pattern is produced under transmitted light will be described. Since the group of phosphorescent elements (5) and the first latent image element group (6-1) are provided with a metal film (13), light does not transmit through them. On the other hand, since the second latent image element group (6-2) is not provided with a metal film (13), light transmits through it. Therefore, since the intensity of the transmitted light varies depending on the presence or absence of the metal film (13), as shown in FIG. 9, it is possible to authenticate a pattern different from the video pattern (4) as a transmission pattern, thereby enabling authenticity discrimination.

[0045] As described above, the characteristic of the effect of the present invention is that, under reflected light, two video patterns (4-1, 4-2) that are indistinguishable at first glance actually have different layer structures, and under transmitted light, it is possible to visually recognize a transmission pattern resulting from the difference in the layer structures.

[0046] (Second Embodiment) Next, as a second embodiment, a configuration will be described in which the luminescent element (7) is formed of dots instead of a strip line. Also, in the first embodiment, the transmissive pattern that can be authenticated under transmitted light was a pattern that had no particular meaning because the image of the latent image element group (6-2) was directly visible. However, in the example of the second embodiment, an example in which significant information with meaning is represented as the transmissive pattern will be described.

[0047] FIG. 10 shows the luminescent element group (5) in the second embodiment. The diffraction grating (18) inside the dot-shaped luminescent element (7) is composed of concentric grating lines (8). This dot-shaped luminescent element (7) is arranged at a specific reference pitch (P0) in the first direction (S1 direction) and also at a specific reference pitch (P0) in the second direction (S2 direction), but the pitches in the first direction (S1 direction) and the second direction (S2 direction) do not have to be the same and may be different.

[0048] Also, in the second embodiment, the dots are formed as perfect circles with a diameter (P0), but they do not have to be perfect circles, and other shapes such as ellipses or polygons can be used without problems. As shown in FIG. 18, the grating lines (8) constituting the diffraction grating (18) do not have to be concentric circles, and the grating lines (8) can be composed of convergent lines or a set of straight lines with different angles, etc. Similar to the case of lines, as long as the effect of continuously moving the region that reflects the light in the luminescent element (7) is produced due to the change in the angle of the incident light, at least a part of the diffraction grating (18) of the luminescent element (7) may have a structure in which the angle of the grating lines (8) continuously changes within a certain range.

[0049] Next, FIG. 11 shows the line configuration of the dot-like latent image element group (6). The dot-like latent image element (10) has a form in which the base image (9) to be reproduced upon reflection is compressed in both the first direction (S1 direction) and the second direction (S2 direction). It is also possible to regard the originally minute-sized image as the base image (9). In this example, the alphabet "OK" is used as the base image (9), which is reduced to form the latent image element (10). These latent image elements (10-1, 10-2) are continuously arranged at a specific first pitch (P1) in the first direction (S1 direction) and at a specific second pitch (P2) in the second direction (S2 direction). The specific first pitch (P1) arranged in the first direction (S1 direction) may be the same or different. The relationship between the first pitch (P1) and the second pitch (P2) of this latent image element (10) and the reference pitch (P0) of the phosphorescent element (7) is the same as that in the first embodiment. When the reference pitch (P0) is set to 100, the first pitch (P1) and the second pitch (P2) need to be set to values excluding 100% within the range of 80% to 120%.

[0050] FIG. 12 shows the division between the first latent image element group (6-1) and the second latent image element group (6-2) of the latent image element group (6). For convenience of explanation, the second latent image element group (6-2) is shown hatched, but actually the hatching is not formed. The "OK" inside the circle indicated by the hatching is the second latent image element group (6-2), and the surrounding area is divided by the first latent image element group (6-1). Each configuration is the same as in the first embodiment, and the phosphorescent element (7) has at least a metal film (13) on the diffraction grating (18). The first latent image element group (6-1) has at least a metal film (13) and does not have a diffraction grating (18). The second latent image element group (6-2) does not have at least a metal film (13) and may or may not have a diffraction grating (18). In this example, it is in a form without a diffraction grating (18).

[0051] Next, the effects of the present invention under reflected light will be described. First, light is incident on the phosphorescent moving image pattern (3), and the effects visually recognized in the situation where diffracted light is generated under the reflected light are shown in FIG. 13. As shown in FIG. 13(a), when light is incident from a light source (11) in a certain direction, two moving image patterns (4) appear in the phosphorescent moving image pattern (3). In the second embodiment, the two appearing moving image patterns (4) form a pair. When there is one light source, two moving image patterns (4) appear, and when there are two light sources (11), four moving image patterns (4) appear.

[0052] This is different from the phosphorescent element (7) of the first embodiment. Since the phosphorescent element (7) composed of concentric dots has two angles orthogonal to the light incident from one light source (11), as shown in FIG. 18 described later, there are two bright spots (α1, α2) sampling the latent image element group (6), and as a result, two moving image patterns (4) appear. Subsequently, as shown in FIG. 13(b), when the position of the light source (11) changes, the two moving image patterns (4) that have appeared in the phosphorescent moving image pattern (3) rotate along the circumference (S3) of the grid line (8) while moving in opposite directions. As shown in FIG. 13(c), when the position of the light source (11) changes, the two moving image patterns (4) that have appeared in the phosphorescent moving image pattern (3) further rotate and move along the circumference (S3) of the grid line (8). As described above, when the position of the light source (11) changes, a moving image effect occurs in which the two moving image patterns (4) in the phosphorescent moving image pattern (3) rotate along the circumference (S3) of the grid line (8). Also, when visually observing these two moving image patterns (4), they appear to have the same density and it is not possible to distinguish the difference at first glance.

[0053] Next, regarding the effect that the transmission pattern appears under transmitted light, which is another feature of the luminous moving image pattern (3) of the present invention, it will be described with reference to FIG. 14. When the luminous moving image pattern (3) is observed under transmitted light, the first latent image element group (6-1) blocks light, and the second latent image element group (6-2) has the effect of transmitting light. Since the luminous element group (5) also has a configuration that blocks light, when the luminous moving image pattern (3) is seen through, only the second latent image element group (6-2) transmits light, and as a result, a circular figure appears. As described above, by arbitrarily combining the first latent image element group (6-1) and the second latent image element group (6-2), significant information can be constructed and meaning can be imparted to the latent image pattern.

[0054] Note that the figures of the luminous element group (5) and the latent image element group (6) shown in the first embodiment and the second embodiment are deformed images for clarity of explanation. Originally, they are composed of a large number of minute lines and dots in the order of several hundred to several tens of μm, and the lines and dots themselves are extremely small and cannot be seen by the naked eye and are configured with a very high density. Therefore, the transmitted image itself is not limited to a simple pattern such as a circular figure as in the second embodiment, and it goes without saying that by dividing it into the first latent image element group (6-1) and the second latent image element group (6-2), complex characters, symbols, marks, etc. can be represented.

[0055] In addition, in order to make the moving image pattern (4) that appears under reflected light not two but one, instead of using a general diffraction grating (18) for the luminous element (7) composed of concentric circles, a diffraction grating (18) with a special structure having an angle in the cross-sectional direction called a blazed diffraction grating may be used. Alternatively, the special dot configuration described in Japanese Patent Application Laid-Open No. 2021-81705 may be used. By configuring the dots with grid lines (8) within an angular range of 180 degrees instead of grid lines (8) in an angular range of 360 degrees as in the dots described in this publication, it is possible to obtain a form in which one moving image pattern (4) appears for the light incident from one light source.

[0056] By arranging the compressed characters, symbols, figures, etc. at a pitch slightly different from the pitch of the luminescent elements (7) in the luminescent video pattern (3) serving as the basis for sampling, a phenomenon called the moiré magnification phenomenon, in which the compressed characters, symbols, etc. appear enlarged, is utilized in, for example, Japanese Patent No. 4844894 and Japanese Patent No. 5131789. When superimposing compressed images with slightly different pitches on a group of lines or a group of pixels, the compressed images appear as moiré. In each embodiment, a simple character such as a circle or "OK" was selected as the base image (9) for the moiré magnification phenomenon, but it is not limited to this, and any image such as symbols, numbers, marks, photographs, etc. can be used.

[0057] In addition, as a method of utilizing the moiré magnification phenomenon other than changing the pitch, there is a method of slightly changing the arrangement angle of the characters or images to be arranged. For example, even when characters (latent image elements (10)) currently configured vertically (90 degrees) are continuously arranged at a slightly inclined angle in either the left or right direction, the first direction (S1), the moiré magnification phenomenon occurs. When the arrangement angle is changed significantly, the resulting moiré becomes distorted and unclear, so it is desirable to keep the arrangement angle within about ±5 degrees. The change in the angle of these latent image elements (10) can be used in combination with the change in pitch without any problem. When using the change in the arrangement angle of the latent image elements (10), there is no problem even if the pitch is 100%.

[0058] In addition to the moiré magnification phenomenon, as a line configuration that can utilize a similar compressed image to produce a moving image effect and can make the latent image element group (6) and the moving image pattern (4) into different images, there is a line configuration called the Integral Photography method (hereinafter referred to as the "IP image method") inspired by the imaging method of a stereoscopic image. It is also possible to apply this to the latent image element group (6). By applying the configuration of the latent image element group (6) described in Patent Document No. 5200284, while expressing a more expressive moving image effect, the layer structure of the latent image element group (6) is divided into the first latent image element group (6-1) and the second latent image element group (6-2) in an arbitrary shape, which may also be a form in which a transmitted image can be authenticated under transmitted light of the present invention. To form a hologram using the moiré magnification phenomenon or the line configuration called the IP image method, the configuration and method described in Japanese Patent Application Laid-Open No. 2021-81705 may be used in the present invention.

[0059] As an example, as shown in FIG. 17, with respect to the base image (9) of a cherry blossom petal, the base image (9) is cut out in a first direction (S1 direction) with a certain width, and by compressing it in the first direction (S1 direction) at a specific reduction ratio, one latent image element (10) is produced. While shifting the position where the base image (9) is cut out at the same pitch (P1) and in the same width (W2) in the first direction (S1 direction), the cutting and compression are repeated to sequentially produce the latent image elements (10), and the latent image element group (6) can be produced by arranging the respective latent image elements (10) in the first direction (S1 direction) at the same pitch (P1).

[0060] The diffraction grating (18) in the luminescent element (7) is preferably configured with a density of 500 or more grating lines (8) per 1 mm. In this case, the moving image pattern (4) produces an effect of moving while gradually changing to different hues such as blue, green, yellow, and red. When it is desired to impart the effect of hue change, it may be configured with about 500 to 3000 grating lines (8) according to the drawing ability of the device.

[0061] Fig. 15 shows an example of a layer structure assumed to be attached to a printed matter using the luminous moving image pattern (3) of the present invention. In this specification, with respect to the luminous moving image pattern (3) of the present invention, it is within the scope of common sense application of the present invention to apply a hologram forming layer (12) with a minimum configuration, a metal film (13), a transparent reflective layer (14) to enhance the luminance, a protective layer (15) to enhance the durability, and an adhesive anchor layer (16) or an adhesive layer (17) to enable attachment to a substrate.

Explanation of Reference Numerals

[0062] 1 Printed matter with a luminous moving image pattern attached 2 Substrate 3 Luminous moving image pattern 4 Moving image pattern 4-1 First moving image pattern 4-2 Second moving image pattern 5 Group of luminous elements 6 Group of latent image elements 6-1 First group of latent image elements 6-2 Second group of latent image elements 7 Luminous element 8 Grid lines of diffraction grating 9 Base image 10 Latent image element 10-1 First latent image element 10-2 Second latent image element 11 Light source 12 Hologram forming layer 13 Metal film 14 Transparent reflective layer 15 Protective layer 16 Adhesive anchor layer 17 Adhesive layer 18 Diffraction grating

Claims

1. A luminescent moving image pattern forming body including a group of luminescent elements and a group of latent image elements, wherein the group of luminescent elements is formed by arranging a plurality of luminescent elements regularly, the luminescent element is composed of a diffraction grating on which a plurality of grating lines are arranged and a metal film covering the diffraction grating, and has a structure in which a region reflecting light in the luminescent element moves continuously due to a change in the incident light angle of light to the grating lines, the group of latent image elements does not include a diffraction grating, and is divided into a first group of latent image elements and a second group of latent image elements, one of which does not include the metal film and the other includes the metal film, furthermore, the group of latent image elements 1) consists of the first group of latent image elements in which a plurality of first latent image elements with a compressed base image are arranged with a regularity different from at least one of the arrangement direction or arrangement pitch of the luminescent elements, and the second latent image elements with a compressed base image the same as or different from the base image are arranged with a regularity different from at least one of the arrangement direction or arrangement pitch of the luminescent elements, or 2) consists of the first group of latent image elements in which a plurality of first latent image elements with a base image divided and compressed are arranged with the same regularity as the regularity of the arrangement direction or arrangement pitch of the luminescent elements, and the second latent image elements with a base image divided and compressed the same as or different from the base image are arranged with the same regularity as the regularity of the arrangement direction or arrangement pitch of the luminescent elements, under reflected light, a first moving image pattern by the first latent image elements and a second moving image pattern by the second latent image elements appear, and depending on the viewing angle, the positions of the first moving image pattern and the second moving image pattern change and are visually recognized, A luminescent moving image pattern forming body, characterized in that under transmitted light, a transmission pattern of an element group that does not include the metal film of either the first group of latent image elements or the second group of latent image elements is visually recognized.

2. The luminescent moving image pattern forming body according to Claim 1, wherein the luminescent element is dot-shaped, and the grating lines are arranged concentrically and / or convergently linearly.

3. The luminescent moving image pattern forming body according to Claim 1, wherein the luminescent element is line-shaped, and has a structure in which at least one of the arrangement angle of the grating lines or the density of the grating lines changes continuously.

Images