JP5223609B2 - Display, adhesive label, transfer foil, and labeled article - Google Patents

Description

  The present invention relates to a counterfeit-preventing display body that is used by being attached to cards, securities, and the like.

Conventionally, forgery prevention optical members such as holograms have been widely used in cards, securities, brand protection, etc. (see, for example, Patent Document 1).
Optical members such as holograms are more complex than ordinary printed materials, and require a large-scale duplicating device for duplication. Therefore, they are difficult to forge, and are exposed to illumination light. Since it has a unique appearance such as bright and bright colors, it is easily distinguished by visual observation, so it is excellent as a visual security member.

  However, the feature that the image shines brightly and vividly has a problem that it is difficult to achieve a balance when used in combination with other image media such as a printed matter because it gives a flashy and intense impression.

In addition, there is a problem that the image can be seen as a very cheap image with an aluminum foil attached from a position where the image can be seen is narrow and the image cannot be seen.
For this reason, there is a problem that it is difficult to use especially those that require a high-class feeling.
JP 2004-230571 A

  As described above, conventional anti-counterfeiting optical members such as holograms are difficult to design because the observed image is too bright and vivid, and the image is often not visible, and it becomes very cheap where it cannot be seen. There was a problem.

  The present invention has been made to solve such problems. When viewed from near the front, the image can be observed as white near paper, and when viewed from the side, a specific image pattern like a hologram can be observed. By making it appear shining, it is easy to design an image when viewed from the front, and it is possible to observe a highly visible image pattern when viewed from the side, thereby providing an anti-counterfeit effect. ing.

In order to solve such a problem, the display body of the present invention includes first to n-th diffraction element regions (a first to n-th diffraction element regions) arranged on a display portion of the display body at a constant pitch with a gap therebetween. n is an integer of 2 or more) and one or a plurality of (n + 1) -th scattering element regions filling at least a part of the gap, each of which includes one or a plurality of interface portions, through n-th diffractive element region is a plurality of recesses or first to one or more areas including the n-th diffraction grating structure consisting of protrusions, lattice spacing of the first through n grating structure or arrangement direction of grating Unlike each other and the first through the lattice spacing of the n diffraction grating structure is at 250nm than 400nm or less, at least one of the one or more of the (n + 1) scattering element region, disordered Consisting of a plurality of recesses or protrusions arranged in, and And the half angle of the reflected light is scattered by the scattering element region 20 ° to 60 °, the portion located on the one or more first diffractive element region, when illuminated with white light from a first direction When the first element display unit that emits the first diffracted light in the first 'direction is configured, and the portion located in the one or more second diffractive element regions is illuminated with white light from the second direction When the second element display unit that emits the second diffracted light in the second ′ direction is configured, and the portion located in the one or more nth diffractive element regions is illuminated with white light from the nth direction A n-th element display unit configured to emit the n-th diffracted light in the n′-direction, and is white from the first to n-th directions at a position located in the one or more (n + 1) -th scattering element regions. when illuminated with light, the (n + 1) scattering element display unit for emitting the scattered light consists It is characterized in.

Further, the display body of the present invention illuminates with the white light from the first direction, and when the display unit is observed with the naked eye from the first ′ direction, the color corresponding to the first diffracted light. And the first element display unit can be identified from a portion of the display unit other than the first element display unit, illuminated with the white light from the second direction, and the display When the part is observed with the naked eye from the second 'direction, the color corresponding to the second diffracted light is displayed, and the second element display part is other than the second element display part among the display parts. If the display unit is observed with the naked eye from the n'th direction and illuminated with the white light from the nth direction, it corresponds to the nth diffracted light. And the nth element display unit is different from the nth element display unit in the display unit. And illuminating with the white light from the first to nth directions, and the display unit from the (n + 1) ′ direction different from the 1 ′ to n ′ directions. When observed with the naked eye, a color corresponding to the scattered light is displayed, and the (n + 1) th scattering element display unit is identified from a portion of the display unit other than the (n + 1) th scattering element display unit. It is characterized by being impossible.

  When the display body of the present invention is normally illuminated and observed from near the front, the entire surface is observed as white like paper and shines brightly like a normal hologram. There is no.

  For this reason, it is easy to use in combination with other image display media. For example, if an image is drawn by printing or the like from above, an image similar to a printed matter can be created, so that it can be used in combination with an ordinary printed matter without a sense of incongruity.

In addition, the range in which the scatterer appears white is considerably wider than that of an ordinary hologram, so it is much less if it looks like a cheap aluminum foil without shining at all.
Furthermore, when the display body of the present invention is observed from the lateral direction, a specific image pattern shines with a bright color like a hologram. For this reason, since it can be easily discriminated visually as in the case of a conventional hologram or the like, an effect as a security medium with high visibility can also be obtained.

  Hereinafter, a first embodiment according to the present invention will be described in detail with reference to the drawings. In addition, this embodiment is a structure in case n is 2 in Claims 1 and 2.

  FIG. 1 is a schematic view showing a display body of a first embodiment according to the present invention. In this figure, this display body has a half-value angle of reflected light of 20 ° to spread uniformly in the areas 1 and 2 where a periodic pattern of about 250 to 400 nm is recorded and the other areas. It is constituted by a scatterer region 3 which is scattered at 60 °. Here, the regions 1, 2, and 3 have a relief structure as shown in FIG. 2, and the reflective layer 4 is formed on the surface by metal vapor deposition or the like.

  In addition, the diffraction grating regions of the periodic pattern formed by the regions 1 and 2 have a halftone dot arrangement configuration regularly arranged, and the pitch between the regions is set to 200 μm or less. The region 1 and the region 2 have a lattice shape with different directions (90 ° in this figure), and are arranged so as to indicate a specific pattern (letter T in this figure).

  When the observer normally observes the display body 5 as described above, for example, as shown in FIG. 3, the illumination light is incident from an angle of about 20 to 45 degrees obliquely upward, and the observer 6 is close to the front. Will be observed from.

The first-order diffracted light from the diffraction grating has a relationship of d = λ / (sinθ1 + sinθ2) (Equation 1) when the diffraction grating pitch is d, the incident light angle θ1, the outgoing light angle θ2, and the wavelength λ. It holds.
When light is incident on the diffraction grating region 1 with a pitch of 250 to 400 nm at an angle of 20 to 45 ° and the visible light wavelength is 380 to 780 nm, the emitted diffraction light has the smallest angle when the pitch is 400 nm, When the incident light is 45 ° and the wavelength is 380 nm, the emission angle of the diffracted light in this case is about 14 °, and under other conditions, the light is emitted at a larger angle.

  Therefore, with respect to incident light from an angle of about 20 to 45 °, the diffracted light from the diffraction grating region 1 with a pitch of 250 to 400 nm is, for example, a large angle upward with respect to the observer as shown in FIG. Or the angle becomes too large to be emitted, and the diffracted light does not reach the observer.

  The diffraction grating region 2 is emitted at a large angle in the lateral direction. For this reason, this light does not reach the observer.

  The scatterer region 3 is a scatterer region in which reflected light is scattered at a half-value width of 20 ° to 60 ° when parallel light is incident. Typically, it consists of several recessed part or convex part arrange | positioned disorderly. The plurality of concave portions or convex portions are arranged at a random center distance, for example. In addition, the depth or height of the plurality of concave portions or convex portions is typically non-uniform.

  Since the half-value angle of the reflected light in the scatterer region is 20 ° or more, for example, light incident from 20 ° returns light having an intensity of more than half of the regular reflection direction in the front direction. For this reason, as shown in FIG. 5, a considerable amount of light is scattered in the direction close to the front, and the observer 6 observes this scattered light.

  At this time, since the regions 1 and 2 are arranged in a sufficiently fine dot pattern with a pitch of 200 μm or less, the viewer does not distinguish the regions 1 and 2 from each other and regards them as uniform. For this reason, it appears to the observer that the display body 5 emits scattered light uniformly over the entire surface, and the whole is recognized as white.

  In this case, the white range is an angular range of ± 20 ° or more because the scatterer has a half-value angle of 20 ° or more. A reconstructed image of an ordinary rainbow hologram can only be observed from a range of about 10 ° (± 5 °) and 15 ° (± 7.5 °) around the front direction when reproduced with parallel light. For this reason, it can be observed from a wide range compared with the conventional hologram, and there are few cases where it looks like a cheap aluminum foil.

  On the other hand, when the observer 5 changes the angle of the display body 5 and observes the display body 5 from an obliquely downward direction, for example, the display body 5 is observed in the form shown in FIG. It will be incident at an angle of ~ 60 °.

  At this time, the diffracted light from the region 1 has a smaller emission angle, for example, when the pitch is 400 nm, for example, 35 ° incident light and 550 nm light are emitted at an angle of 40 ° larger than the incident light. The diffracted light enters the eyes of the observer 6 in the form shown in FIG.

  For the larger emission angle, even at 250 nm pitch, for example, 60 ° incidence and 400 nm light are emitted at an angle of 70 °, so the diffracted light is also observed as shown in FIG. can do. A smaller pitch is possible when considering only the visible light range, but considering that diffracted light can be observed with a certain degree of brightness, it is better to set a pitch interval larger than this.

  The diffracted light from the region 2 is emitted at a large lateral angle. For this reason, it does not enter the eyes of the observer 6 when viewed from the front.

  The scattered light from the region 3 spreads around the regular reflection direction as shown in FIG. The angle reaching the eyes of the observer is a large angle, and the light emitted as scattered light is considerably weakened. At this time, in order for the scattered light to be sufficiently weak, it is better to make the angle between the incident light and the observation direction more than double the half-value angle, so the half-value angle of the scatterer becomes 60 ° or less. It is better to be.

  In this case, only the diffracted light from the region 1 reaches the observer's eyes, and as shown in FIG. 9, only the region 1 portion shines and the other portions appear dark. For this reason, in the case of this figure, it looks as if it is shining in a pattern of T to the observer.

  At this time, if the observer can clearly recognize the pattern T, a higher anti-counterfeit effect can be expected. For example, in the direction in which the diffracted light is emitted, the intensity of the diffracted light is the intensity of the scattered light in the above direction. It should be at least twice as large.

  Further, when the observer 6 changes the angle of the display body 5 and observes it from an oblique lateral direction, for example, for the same reason, only the portion of the region 2 is lit and the other portions are dark as shown in FIG. appear. For this reason, in this case, the pattern around the letter T appears to shine.

  Next, a second embodiment according to the present invention will be described in detail with reference to the drawings. In addition, this embodiment is also a structure in case n is 2 in Claims 1 and 2.

  FIG. 11 is a schematic view showing a display body according to the second embodiment of the present invention. In this figure, the display body includes regions 7 and 8 in which a periodic pattern of about 250 to 400 nm is recorded, and a scatterer region in which the half-value angle of reflected light is scattered at 20 ° to 60 °. 3.

  Here, the diffraction grating regions of the periodic pattern formed by the regions 7 and 8 are arranged in a regular dot pattern, and the pitch between the regions is set to 200 μm or less. The region 7 and the region 8 are lattices having periods with different pitch intervals (for example, the region 7 is 340 nm, the region 8 is a lattice with a 400 nm pitch), and has a specific pattern (T in this figure). It is arranged to indicate.

  When an observer normally observes such a display body, the entire surface is observed in white for the same reason as in the case of observing the display body of the first embodiment.

On the other hand, when such a display body is observed obliquely from below, the diffracted light reaches the observer's eyes for the same reason as in the first embodiment. However, in this case, since the pitch is different in the area 7 and region 8, will be different wavelength reaching the eye from the relationship (Equation 1).

  Therefore, these two areas can be observed in different colors. For example, as shown in FIG. 12, the T-shaped part corresponding to the area 7 is green, and the surrounding part corresponding to the area 8 is reproduced in red. It will be done. So, as a whole, the letter pattern T appears to shine in red and green.

  FIG. 13 is a schematic view showing a display body according to the third embodiment of the present invention. Here, for example, the entire display body has a configuration similar to that shown in FIG. By doing so, it is possible to make the pattern look white when viewed from the front and shine like a pattern when viewed from the side.

  FIG. 14 is a schematic view showing a display body according to the fourth embodiment of the present invention. Here, for example, a picture is drawn by a transparent colored ink layer on a display body having the same configuration as that shown in FIG. In this way, it looks like an ordinary picture from the front, and it looks shining when viewed from an angle.

  A display body like this invention can be produced as follows, for example.

  First, a resist dry plate is prepared in which a photoresist is coated on a glass plate like EB. Then, a pattern is drawn thereon using an EB drawing apparatus.

  The pattern to be drawn is, for example, as follows. First, in FIG. 15, EB writing is performed on a 100 μm square region at an interval of, for example, 300 nm, and such a region is disposed so as to indicate a letter T, for example. Next, EB writing is performed on a 100 μm square region at intervals of 300 nm in a direction perpendicular to the rectangular region, and these are arranged so as to line up around the letter T. Then, drawing is performed so that these two regions are regularly arranged vertically and horizontally at intervals of 200 μm. Next, for example, random lines with an interval of 1 μm to 5 μm are drawn in a portion between these regions.

  In this way, a surface relief pattern is created by developing the drawn resist dry plate. At this time, the lattice portions at intervals of 300 nm are set to a depth of about 100 nm, for example, and the random relief portions around 1 μm to 5 μm around the lattice portions are set to a depth of about 300 nm, for example.

  The surface relief pattern on the resist dry plate thus prepared is copied onto a metal mold by a technique such as metal plating.

  Using this metal mold, for example, by embossing on a resin film such as a vinyl chloride film, a surface relief pattern is formed on the resin.

  For example, by depositing a metal such as aluminum on such a resin film to form a reflective layer, the diffraction grating and the scattering layer as shown in the embodiment according to the present invention are arranged in a dot pattern. You can create something like this.

  When the film created in this way is illuminated obliquely from the top and viewed from the front, the whole will shine white, and when the film is tilted and observed from obliquely below, the letter T becomes blue like a hologram. It looks like shining. In addition, when observed obliquely from the side, the letter T appears black and the surrounding area appears to glow blue.

  The display body according to the present invention described above may be used as a part of an adhesive label, a transfer foil, or the like.

  The pressure-sensitive adhesive label can be prepared by providing a pressure-sensitive adhesive layer on the display body. When the adhesive layer is provided, the surface of the relief pattern can be prevented from being exposed, so that it is possible to make it more difficult to duplicate the concave portion or convex portion of the previous interface. This adhesive label is affixed, for example, to an article whose authenticity is to be confirmed, or is attached to another article such as a tag base material to be attached to such an article. Thereby, the forgery prevention effect can be provided to the said article | item.

  On the other hand, the transfer foil can be prepared by providing a support layer that releasably supports the display body. As an example, a peeling protective layer is provided between the display surface and the support layer, and an adhesive layer is provided on the back surface of the display. The peeling protective layer plays a role of facilitating peeling of the support layer when transferring the transfer foil to the transfer target.

  In addition, the display body according to the present invention can be incorporated into a labeled article. As an example, the display body can be fixed to a base material of an IC (integrated circuit) card via an adhesive layer. Since this IC card further includes an IC chip and a printed layer in addition to the display body, it is possible to adopt a forgery prevention measure using them.

As described above, the display body of the present invention appears white when viewed from near the front, and shines like a hologram when viewed from an oblique direction.
For this reason, it can be attached to cards and securities, etc., and can display a calm image when viewed normally, and is effective as a member for preventing counterfeiting that is highly visible when viewed from an oblique direction. Can be issued.
For this reason, it may be used as a member for security purposes.

These are the schematic diagrams which show the display body of 1st Embodiment which concerns on this invention. These are the schematic diagrams which show one structural example when the area | region of the display body of 1st Embodiment which concerns on this invention is seen from the side. These are the schematic diagrams which show an Example of an observation layout when observing the display body of 1st Embodiment which concerns on this invention from the front. These are the schematic diagrams which show an example of the emission direction of the diffracted light from a diffraction grating area | region when illumination light hits the display body of 1st Embodiment which concerns on this invention. These are the schematic diagrams which show an example of the emission direction of the scattered light from a scatterer area | region when the illumination light hits the display body of 1st Embodiment which concerns on this invention. These are the schematic diagrams which show one Example of an observation layout when observing the display body of 1st Embodiment which concerns on this invention from diagonally downward direction. These are the schematic diagrams which show an example of the emission direction of the diffracted light from a diffraction grating area | region when illumination light hits the display body of 1st Embodiment which concerns on this invention. These are the schematic diagrams which show an example of the emission direction of the scattered light from a scatterer area | region when the illumination light hits the display body of 1st Embodiment which concerns on this invention. These are the schematic diagrams which show an example of the image seen when observing the display body of 1st Embodiment which concerns on this invention from diagonally downward direction. These are the schematic diagrams which show an example of the image seen when observing the display body of 1st Embodiment which concerns on this invention from diagonally horizontal direction. These are the schematic diagrams which show the example of 1 structure of the display body of 2nd Embodiment which concerns on this invention. These are the schematic diagrams which show an example of the image seen when observing the display body of 2nd Embodiment which concerns on this invention from diagonally downward direction. These are the schematic diagrams which show the example of 1 structure of the display body of 3rd Embodiment which concerns on this invention. These are the schematic diagrams which show the example of 1 structure of the display body of 4th Embodiment which concerns on this invention. These are the schematic diagrams which show the structural example of one Example of the display body of 1st Embodiment which concerns on this invention.

Claims (11)

First to n-th diffraction element regions (n is an integer of 2 or more) arranged in a halftone dot pattern with a gap between each other and at least a part of the gap are filled in the display portion of the display body. One or more (n + 1) th scattering element regions each comprising one or more interfaces,
The first to nth diffraction element regions are one or a plurality of regions including first to nth diffraction grating structures composed of a plurality of concave portions or convex portions,
The first to the array direction of the lattice spacing or the lattice of the n grating structure Unlike each other, and the lattice spacing of the first through n diffraction grating structure is at 250nm than 400nm or less,
At least one of the one or more (n + 1) th scattering element regions is composed of a plurality of recesses or protrusions arranged randomly, and the half-value angle of the reflected light scattered in the scattering element region is 20 °. More than 60 degrees,
A first element display unit configured to emit the first diffracted light in the first ′ direction when the white light is illuminated from the first direction at the position located in the one or more first diffractive element regions is configured,
A second element display unit configured to emit the second diffracted light in the second 'direction when illuminated with white light from the second direction at a location located in the one or more second diffractive element regions is configured,
An n-th element display unit that emits the n-th diffracted light in the n-th direction when illuminated with white light from the n-th direction at a location located in the one or more n-th diffraction element regions is configured,
A (n + 1) -th scattering element display unit that emits scattered light when illuminated with white light from the first to n-th directions at a position located in the one or more (n + 1) -th scattering element regions is configured. Being
A display body characterized by that. When illuminating with the white light from the first direction and observing the display unit with the naked eye from the first ′ direction, a color corresponding to the first diffracted light is displayed, and the first element The display unit can be identified from the display unit other than the first element display unit,
When illuminating with the white light from the second direction and observing the display unit with the naked eye from the second ′ direction, a color corresponding to the second diffracted light is displayed, and the second element The display unit can be identified from the display unit other than the second element display unit,
When illuminating with the white light from the n-th direction and observing the display unit with the naked eye from the n-th direction, a color corresponding to the n-th diffracted light is displayed, and the n-th element The display unit can be identified from the display unit other than the n-th element display unit,
When the white light is illuminated from the first to n-th directions and the display unit is observed with the naked eye from the (n + 1) ′ direction different from the 1 ′ to n′-directions, the scattered light display color corresponding to a and the (n + 1) th scattering element display unit unable to identify from said first (n + 1) portions other than the scattering element display unit of said display unit,
The display body according to claim 1. In at least one of the one or more interface portions, the one or more (n + 1) th scattering element regions are uniformly arranged over the entire first interface portion. The display body according to claim 1 or 2. In at least one of the one or more interface portions, at least one of the one or more first to n-th diffraction element regions is a pattern made of a pattern, a character, or a symbol on the interface portion. The display body according to claim 1, wherein the display body is arranged in a shape. At least one of the one or more interface portions includes at least one of the first to (n + 1) th scattering element regions, and the first to (n + 1) th scattering element regions. 5. The display body according to claim 1, wherein at least one of them forms a halftone dot at the interface portion. 6. Wherein at least one of the intensity of the first 'to n' diffracted light, any one of claims 1 to 5, characterized in that said at first (n + 1) more than twice the intensity of the scattered light emitted in the direction The display body according to item 1. Overall shape of the display according to any one of claims 1 to 6, the display according to any one of claims 1 to 6, characterized in that is in the form that has a specific meaning body. On the display body according to any one of claims 1 to 7, the ink layer is provided, any claim 1 to 7, characterized in that the characters or images are expressed by the ink layer The display body according to item 1. Adhesive label, characterized in that the display body, and and a pressure-sensitive adhesive layer provided on the display member according to any one of claims 1 to 8. Transfer foil, wherein the display body according, by comprising a support layer which is releasably supporting the display body in any one of claims 1 to 8. Labeled article, characterized by comprising a product of displaying body and supporting the according to any one of claims 1 to 8.

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