JP7263780B2 - Labels and articles - Google Patents

Description

Embodiments of the present invention relate to display labels and articles with display labels.

A plurality of unit pixels are allocated to a display label capable of displaying a pseudo stereoscopic image. The display label has a fine concave-convex structure belonging to each pixel. The uneven structure includes a plurality of slopes that reflect light. Each pixel emits light in a direction corresponding to the inclination angles and azimuth angles of the plurality of slopes belonging to each pixel. The display label displays a pseudo three-dimensional image by the light emitted from each pixel. In this way, a pseudo-stereoscopic image is recorded on the display label by the inclination angle and the azimuth angle of the slope belonging to each pixel (see Patent Document 1, for example).

JP 2013-167796 A

By the way, the fine concave-convex structure belonging to each pixel is part of one relief layer of the display label. The plurality of slopes belonging to each concave-convex structure are part of the relief surface of the relief layer. Relief surfaces often include a plurality of ramps and a flat surface positioned around the plurality of ramps. A reflective layer with a higher light reflectance than the relief layer may be placed on the relief surface for the purpose of enhancing the sense of depth of the 3D image recorded on the display label and for the purpose of enhancing the design of the display label. be. In this case, the relief surface is usually provided with a reflective layer that has a shape that is less relevant to the three-dimensional image recorded on the display label and that is significantly larger than the area where the multiple slopes are located. be.

According to such a reflective layer, since high-intensity light is reflected from both the portion located on the flat surface and the portion located on the inclined surface in the reflective layer, the light reflected from the inclined surface forms a A stereoscopic image is less noticeable against light reflected from a flat surface. As a result, the 3D image formed by the display label may not catch the eye of the observer who observes the display label. Therefore, there is a demand for a technique capable of enhancing the sense of depth of a stereoscopic image recorded on a display label.

Embodiments of the present invention can provide a display label and an article that can enhance the sense of depth of a stereoscopic image recorded on the display label.

A display label for solving the above problems includes a recording area configured with fine unevenness for recording a stereoscopic image, and a flat area surrounding the recording area and being flatter than the recording area. a recording layer having a recording surface; and a light reflectance higher than that of the recording layer, overlapping the recording area when viewed from the thickness direction of the recording layer, and having a shape following the outer shape of the recording area. and a reflective layer.

An article for solving the above problem includes the display label and a plastic plate supporting the display label.
According to each of the above configurations, since the reflective layer has a shape that follows the outer shape of the recording area, it is possible to increase the contrast between the brightness of the recording area and the brightness of the flat area surrounding the recording area. As a result, the stereoscopic image recorded in the recording area stands out from the flat area, thereby enhancing the sense of depth of the stereoscopic image.

In the display label, in a shape following the outline of the recording area when viewed from the thickness direction of the recording layer, the edge of the recording area framing the outline of the recording area and the outline of the reflective layer framing. A distance from the edge of the reflective layer may be 1 mm or less over the entire edge of the recording area.

According to the above configuration, an observer observing the display label cannot separately observe the edge of the recording area and the edge of the reflective layer. Therefore, the observer recognizes that the shape of the recording area and the shape of the reflective layer are the same. This further enhances the contrast between the stereoscopic image recorded in the recording area and its surroundings. As a result, the sense of depth of the stereoscopic image recorded in the recording area is enhanced.

In the display label, in a shape following the outline of the recording area when viewed from the thickness direction of the recording layer, the edge of the recording area framing the outline of the recording area and the outline of the reflective layer framing. A distance from the edge of the reflective layer may be 5% or less of the maximum width of the recording area over the entire edge of the recording area.

In the above display label, a first direction and a second direction orthogonal to the first direction are set on a plane on which the display label extends, and when viewed from the thickness direction of the recording layer, it circumscribes the recording area. A distance between the center of the circumscribed circle and the center of the circumscribed circle circumscribing the reflective layer may be 1 mm or less in the first direction and the second direction.

According to each of the above configurations, an observer who observes the display label is more likely to recognize that the recording area and the reflective layer have the same shape when viewed from the thickness direction of the recording layer. This further enhances the contrast between the stereoscopic image recorded in the recording area and its surroundings. As a result, the sense of depth of the stereoscopic image recorded in the recording area is enhanced.

In the display label, the reflective layer may protrude from the recording area over the entire edge of the recording area when viewed from the thickness direction of the recording layer. According to the above configuration, since the reflective layer is larger than the recording area when viewed from the thickness direction of the recording layer, even if the reflective layer is displaced relative to the recording area, the entire recording area is reflective. Easily covered by layers.

In the display label, the reflective layer may be located inside the edge of the recording area over the entire edge of the recording area when viewed in the thickness direction of the recording layer. According to the above configuration, the reflective layer is smaller than the recording area when viewed from the thickness direction of the recording layer. It becomes difficult to protrude from the edge to the extent that it can be visually recognized by an observer.

According to the embodiments of the present invention, it is possible to enhance the sense of depth of the stereoscopic image recorded on the display label.

Sectional drawing explaining the structure in the display label of 1st Embodiment. The top view explaining the structure in the display label of 1st Embodiment. FIG. 2 is a partially enlarged plan view explaining an enlarged part of the structure of the display label of the first embodiment; FIG. 2 is a partially enlarged plan view explaining an enlarged part of the structure of the display label of the first embodiment; FIG. 4 is a schematic diagram for explaining observation points when observing the display label of the first embodiment; FIG. 4 is a diagram for explaining the action of the display label of the first embodiment; FIG. 4 is a diagram for explaining the action of the display label of the first embodiment; Sectional drawing which shows the structure in the display label of a comparative example. The figure for demonstrating the effect|action in the display label of a comparative example. The figure for demonstrating the effect|action in the display label of a comparative example. The top view explaining the structure in the planar view which opposes the surface in the article|item of 1st Embodiment. The top view explaining the structure in the planar view which opposes the back surface in the article|item of 1st Embodiment. Sectional drawing explaining the structure of the display label attached|subjected to the goods of 1st Embodiment. Sectional drawing explaining the structure in the display label of 2nd Embodiment. The figure for demonstrating the effect|action in the display label of 2nd Embodiment. The figure for demonstrating the effect|action in the display label of 2nd Embodiment.

[First embodiment]
A first embodiment of an indication label and an article provided with an indication label will be described with reference to FIGS. 1 to 13. FIG. In the following, the structure of the display label, the action of the display label, the structure of the display label of the comparative example, the action of the display label of the comparative example, the structure of the article, the manufacturing method of the display label, and the experimental results will be described in order.

[Display label structure]
The structure of the display label will be described with reference to FIGS. 1 to 4. FIG.
As shown in FIG. 1, the display label 10 has a recording layer 11 and a reflective layer 12 . The recording layer 11 has a recording surface 11S including a recording area 11A and a flat area 11B. The recording area 11A is composed of fine unevenness for recording a stereoscopic image. The flat area 11B surrounds the recording area 11A and is flatter than the recording area 11A. The light reflectance of the reflective layer 12 is higher than the light reflectance of the recording layer 11 . The reflective layer 12 overlaps the recording area 11A when viewed from the thickness direction of the recording layer 11 and has a shape that follows the outline of the recording area 11A. Furthermore, the contour of the reflective layer 12 is slightly outside or slightly inside the contour of the recording area 11A, or consists of a slightly outside contour portion and a slightly inside contour portion.

In this embodiment, the recording surface 11S includes a first recording area 11A1 and a second recording area 11A2. The first recording area 11A1 has a plurality of inclined surfaces A11 inclined at a predetermined angle with respect to the flat area 11B. The multiple inclined surfaces A11 include a first inclined surface and a second inclined surface. The direction in which the first inclined surface reflects the light incident on the first inclined surface is different from the direction in which the second inclined surface reflects the light incident on the second inclined surface. The second recording area 11A2 has a diffraction grating A21 for recording a stereoscopic image.

When viewed from the thickness direction of the recording layer 11, the reflective layer 12 includes a first reflective portion 12A having a shape following the outer shape of the first recording area 11A1 and a second reflective portion 12A having a shape following the outer shape of the second recording area 11A2. 2 reflector 12B.

The first inclined surface is incident on the first inclined surface by making at least one of the angle at which the first inclined surface is inclined with respect to the flat surface and the azimuth angle, which is the direction of the first inclined surface, different from the other surfaces. It is possible to reflect the emitted light in a direction different from that of the second inclined surface. Thus, a stereoscopic image is recorded in the first recording area 11A1. The azimuth angle is the angle formed by the projection line obtained by projecting the normal line of each inclined surface onto the recording surface 11S and the reference direction set on the recording surface 11S.

The recording layer 11 has a light transmittance that allows the light incident on the recording layer 11 to pass through to the reflective layer 12 . The recording layer 11 has an observation surface 11OB opposite to the recording surface 11S. The observation surface 11OB is flatter than the recording surface 11S. The observation surface 11OB is a substantially flat surface. Therefore, the inclination angle of the inclined surface can also be defined by the observation surface 11OB.

The recording layer 11 has a plurality of convex portions each including an inclined surface A11. Each convex portion protrudes with respect to the flat region 11B. In a cross section along a plane perpendicular to the flat region 11B, each projection has a right-angled triangular shape, whereby the plurality of projections have a sawtooth shape. The height of each projection may be 100 nm or more and 5 μm or less, or may be 400 nm or more and 500 nm or less. The height of each convex portion is the amount of protrusion from the flat region 11B. In a cross section along a plane orthogonal to the flat region 11B, the pitch of the protrusions may be 1 μm or more and 20 μm or less. A stereoscopic image formed by white light is recorded in the first recording area 11A1.

The diffraction grating A21 diffracts the light incident on the diffraction grating A21 as diffracted light. As a result, a three-dimensional image is recorded in the second recording area 11A2, which is formed by light beams obtained by splitting white light and having different wavelengths. The diffraction grating A21 provided in the second recording area 11A2 may include a plurality of portions that differ from each other in at least one of the spatial frequency and the direction in which the unevenness is repeated in the diffraction grating A21. In the diffraction grating A21, the height and pitch of the convex portions may be smaller than the height and pitch of the convex portions located in the first recording area 11A1.

When the display label 10 is viewed from the direction facing the reflective layer 12 , light that has entered the reflective layer 12 without passing through the recording layer 11 is reflected by the reflective layer 12 . The light reflected by the reflective layer 12 is visually recognized by an observer. On the other hand, when the display label 10 is viewed from the direction facing the recording layer 11, the light incident on the reflective layer 12 via the recording layer 11 is reflected at the interface between the recording layer 11 and the reflective layer 12. reflected. Then, the light reflected at the interface is emitted outside the display label 10 through the recording layer 11, and as a result, is visually recognized by an observer. However, in any case, the direction in which the light incident on the display label 10 is reflected depends on the characteristics of the inclined surface A11 located in the first recording area 11A1 and the diffraction grating located in the second recording area 11A2. It depends on the properties of A21.

The first emission direction in which the light that has entered the first recording area 11A1 is emitted from the first recording area 11A1 is different from the second emission direction in which the light that has entered the second recording area 11A2 is emitted from the second recording area 11A2. ing.

The direction in which the light incident on the inclined surface A11 is reflected depends on the angle at which the inclined surface A11 is inclined and the azimuth angle of the inclined surface A11. Also, the direction in which the light incident on the diffraction grating A21 is reflected depends on the spatial frequency of the diffraction grating A21 and the direction in which the unevenness is repeated on the diffraction grating A21. Therefore, in the display label 10, the first emission direction in which the first recording area 11A1 reflects light and the second emission direction in which the second recording area 11A2 reflects light are the angle at which the inclined surface A11 is inclined and the angle at which the inclined surface A11 is inclined. Different directions are set depending on the azimuth angle of A11, the spatial frequency of the diffraction grating A21, and the repeating direction of the unevenness of the diffraction grating A21.

The fact that the shape of the first reflective portion 12A follows the shape of the first recording area 11A1 means that the first reflective portion 12A has a shape substantially identical to the shape of the first recording area 11A1 in plan view facing the recording surface 11S. and having a shape substantially similar to the shape of the first recording area 11A1. The fact that the shape of the second reflective portion 12B follows the shape of the second recording area 11A2 means that the second reflective portion 12B has a shape substantially identical to the shape of the second recording area 11A2 in plan view facing the recording surface 11S. and having a shape substantially similar to the shape of the second recording area 11A2.

In the first recording area 11A1, the first reflecting portion 12A is positioned on each inclined surface A11, while the side surface of the convex portion other than the inclined surface A11 and substantially orthogonal to the flat area 11B has a not located. Alternatively, in the first reflecting portion 12A, the thickness of the portion located on each inclined surface A11 is thicker than the thickness of the portion of the convex portion located on the side surface other than the inclined surface A11. In the second recording area 11A2, the second reflecting portions 12B are located on the top surfaces of the respective convex portions and the grooves between the convex portions, while the side surfaces of the convex portions other than the top surfaces are located in the flat areas 11B. It is not positioned on a side surface substantially orthogonal to the Alternatively, in the second reflecting portion 12B, the top surface of each projection and the portion located in the groove between the projections are thicker than the side surfaces of the projections other than the top surface.

The optical density of the reflective layer 12 is preferably 1.0 or more. The optical density is defined by the following formula in JIS Z 8120:2001, and is a quantity representing the extent to which a substance absorbs light.

D=log ₁₀ (l ₀ /l)
In the above formula, D is the optical density, _l0 is the intensity of the incident light, and l is the intensity of the transmitted or reflected light.

Materials for forming the recording layer 11 may be various synthetic resins. The synthetic resin can be a thermoplastic resin, a thermoset resin, or an ultraviolet curable resin. The thermoplastic resin can be an acrylic resin or the like. The thermosetting resin can be a urethane resin, a urethane acrylate resin, or the like. The UV curable resin can be an acrylic resin, an acrylic acrylate resin, a urethane acrylate resin, or the like. The thickness of the recording layer 11 may be 1 μm or more and 3 μm or less. Materials for forming the reflective layer 12 may be various metals. The thickness of the reflective layer 12 may be 5 nm or more and 100 nm or less. Furthermore, the thickness of the reflective layer 12 may be 10 nm or more and 80 nm or less. In this range, reflection of visible light tends to occur.

FIG. 2 shows a planar structure of the recording layer 11 observed from the observation surface 11OB. In FIG. 2, the outline of the first recording area 11A1 and the outline of the second recording area 11A2 of the recording surface 11S are indicated by solid lines. On the other hand, in FIG. 2, the outer shape of each part of the reflective layer 12 is indicated by a chain double-dashed line.

As shown in FIG. 2, in the display label 10, the second recording area 11A2, the first recording area 11A1, and the second recording area 11A2 may be arranged with a gap along one direction. In the configuration illustrated in FIG. 2 of this embodiment, one of the two second recording areas 11A2 records an illustration of a human face as a stereoscopic image in one of the second recording areas 11A2, and the other second recording area 11A2 records The area 11A2 has a configuration in which an illustration of the sun is recorded as a stereoscopic image. In this configuration, the outer shape of each second recording area 11A2 and the outer shape of the stereoscopic image recorded in each second recording area 11A2 are substantially the same.

On the other hand, in the first recording area 11A1 having the configuration described in FIG. 2 of the present embodiment, rectangles substantially similar to each other are arranged as a stereoscopic image so that the centers of the rectangles are aligned with each other. is recorded. The outer shape of the first recording area 11A1 and the outer shape of the stereoscopic image recorded in the first recording area 11A1 are substantially the same. The three-dimensional images recorded in the recording areas 11A1 and 11A2 are not limited to the images described above, and may be geometric patterns, texts, signs, symbols, emblems, crests or codes, or combinations thereof. Symbols and emblems include flags, shields, swords, spears, crowns, stars, moons, hearts, logos, ribbons, lines, flowers, leaves, grains, fruits, birds, wings, fish, arthropods, mammals, mythical Can include organisms, reptiles and amphibians. The code can be a one-dimensional code or a two-dimensional code. A one-dimensional code can be a bar code, a serial number, or a combination of both. The two-dimensional code can be a QR code (registered trademark). The geometric pattern can be a three-dimensional image of a Guilloche. Text can be letters, numbers, symbols, and the like.

FIGS. 3(a) and 3(b) show an enlarged view of a region A surrounded by a dashed line in FIG. 2. FIG. FIG. 3(a) shows an example of the relationship between the outer shape of the second recording area 11A2 and the outer shape of the second reflecting section 12B, while FIG. 3(b) shows the outer shape of the second recording area 11A2. and the outer shape of the second reflecting portion 12B. Note that the relationship between the outer shape of the second recording area 11A2 and the outer shape of the second reflecting section 12B described below also applies to the relationship between the outer shape of the first recording area 11A1 and the outer shape of the first reflecting section 12A. Is possible.

As shown in FIG. 3A, the second reflective portion 12B may protrude from the second recording area 11A2 over the entire edge 11E of the second recording area 11A2 when viewed from the thickness direction of the recording layer 11. FIG. The edge 11E of the second recording area 11A2 is a linear portion having a shape that borders the outer shape of the second recording area 11A2. Since the reflective portions 12A and 12B are larger than the recording areas 11A1 and 11A2 when viewed from the thickness direction of the recording layer 11, even if the relative positional deviation of the reflective portions 12A and 12B with respect to the recording areas 11A1 and 11A2 occurs, , the entire recording areas 11A1 and 11A2 are likely to be covered with the reflecting portions 12A and 12B.

Alternatively, as shown in FIG. 3(b), the second reflecting portion 12B, when viewed from the thickness direction of the recording layer 11, extends from the edge 11E of the second recording area 11A2 over the entire edge 11E of the second recording area 11A2. may also be located inside. Since the reflective portions 12A and 12B are smaller than the recording areas 11A1 and 11A2 when viewed from the thickness direction of the recording layer 11, even if the relative positions of the reflective portions 12A and 12B with respect to the recording areas 11A1 and 11A2 are displaced, , the reflection portions 12A and 12B are less likely to protrude from the edges 11E of the recording areas 11A1 and 11A2 to such an extent that they can be visually recognized by the observer.

In any of these cases, it is preferable that the outer shape of the second reflecting portion 12B and the outer shape of the second recording area 11A2 satisfy the following conditions. The outer shape of the second reflecting portion 12B and the outer shape of the second recording area 11A2 may satisfy only one of the following two conditions, or may satisfy both of the two conditions at the same time.

(Condition 1) When viewed from the thickness direction of the recording layer 11, in a shape that follows the outline of the second recording area 11A2, the edge 11E of the second recording area 11A2 bordering the outline of the second recording area 11A2, A distance DIS (see FIG. 3) between the edge 12E of the second reflecting portion 12B and the outer shape of the reflecting portion 12B is 1 mm or less over the entire edge 11E of the second recording area 11A2.

(Condition 2) When viewed from the thickness direction of the recording layer 11, in a shape following the outline of the second recording area 11A2, the edge 11E of the second recording area 11A2 bordering the outline of the second recording area 11A2, and The distance DIS (see FIG. 3) between the edge 12E of the second reflecting portion 12B framing the outer shape of the reflecting portion 12B is the maximum width of the second recording area 11A2 over the entire edge 11E of the second recording area 11A2. It can be 5% or less. Furthermore, the distance DIS may be 1% or less of the maximum width of the second recording area 11A2.

When condition 1 or condition 2 is satisfied, the observer observing the display label 10 cannot individually observe the edges 11E of the recording areas 11A1 and 11A2 and the edges 12E of the reflecting portions 12A and 12B. Therefore, the observer recognizes that the shape of the recording areas 11A1 and 11A2 and the shape of the reflecting portions 12A and 12B are the same. As a result, the contrast between the stereoscopic image recorded in the recording areas 11A1 and 11A2 and its surroundings is enhanced. As a result, the sense of depth of the stereoscopic images recorded in the recording areas 11A1 and 11A2 is enhanced.

In this embodiment, the outer shape of the second recording area 11A2 can be circular. If the outer shape of the second recording area 11A2 is circular and the second recording area 11A2 and the second reflecting portion 12B satisfy Condition 1, the outer shape of the second reflecting portion 12B is also substantially circular. That is, the outer shape of the second recording area 11A2 and the outer shape of the second reflecting section 12B can be similar. Also, the distance DIS can be set to 1 mm or less over the entire circumferential direction of the second recording area 11A2.

When the second recording area 11A2 and the second reflecting section 12B satisfy Condition 2, the outer shape of the second reflecting section 12B is also substantially circular, and the distance DIS is the entire circumference of the second recording area 11A2. 5% or less of the maximum width of the second recording area 11A2. Since the outer shape of the second recording area 11A2 is circular, the maximum width of the second recording area 11A2 is equal to the diameter of the second recording area 11A2.

When Condition 1 is satisfied, the value of the distance DIS may be constant over the entire edge 11E of the second recording area 11A2, or the value of the distance DIS may vary along the edge 11E. Also, when condition 2 is satisfied, the value of the distance DIS may be constant over the entire edge 11E of the second recording area 11A2, or the value of the distance DIS may vary along the edge 11E. In any of these cases, by satisfying condition 1 or condition 2, it is possible to obtain an equivalent sense of depth.

FIG. 4 illustrates a planar structure of a portion of the display label 10 including the second recording area 11A2 and an enlarged structure of an area B that is part of the portion.
The outer shape of the second reflecting portion 12B and the outer shape of the second recording area 11A2 can further satisfy the following conditions.

(Condition 3) A first direction D1 and a second direction D2 orthogonal to the first direction D1 are set on the plane on which the display label 10 extends. When viewed from the thickness direction of the recording layer 11, the distance between the center MC11 of the circumscribed circle circumscribing the second recording area 11A2 and the center MC12 of the circumscribed circle circumscribing the second reflecting portion 12B is the first direction D1. and 1 mm or less in the second direction D2.

When the condition 3 is satisfied, an observer observing the display label 10 recognizes that the recording areas 11A1 and 11A2 and the reflecting portions 12A and 12B have the same shape when viewed from the thickness direction of the recording layer 11. more likely to do so. As a result, the contrast between the stereoscopic image recorded in the recording areas 11A1 and 11A2 and its surroundings is enhanced. As a result, the sense of depth of the stereoscopic images recorded in the recording areas 11A1 and 11A2 is enhanced.

As shown in FIG. 4, the center MC11 of the circumscribed circle of the second recording area 11A2 is also the center of the inscribed circle of the second recording area 11A2. The center MC12 of the circumscribed circle of the second reflecting portion 12B is also the center of the inscribed circle of the second reflecting portion 12B. A first distance DIS1 is the distance between the center MC11 of the circumscribed circle of the second recording area 11A2 and the center MC12 of the circumscribed circle of the second reflecting portion 12B in the first direction D1. In the second direction D2, the distance between the center MC11 of the circumscribed circle of the second recording area 11A2 and the center MC12 of the circumscribed circle of the second reflecting portion 12B is the second distance DIS2. The first distance DIS1 can be 1 mm or less, and the second distance DIS2 can also be 1 mm or less.

The display label 10 may satisfy any one of conditions 1 to 3 described above. Alternatively, the display label 10 may satisfy a plurality of conditions 1 to 3 at the same time. When the display label 10 satisfies all of the conditions 1 to 3, the displacement of the reflective layer 12 with respect to the position of the second recording area 11A2 is easily suppressed.

[Effect of display label]
The operation of the display label 10 will be described with reference to FIGS. 5 to 7. FIG. The operation of the display label 10 when the light source of the light incident on the display label 10 is positioned above the display label 10 in the vertical direction will be described below. 5, the illustration of the reflective layer 12 included in the display label 10 is omitted for convenience of illustration.

As shown in FIG. 5, the light source LS is located above the display label 10 in the vertical direction. The light source LS is, for example, room light or natural light. The light incident on the display label 10 is reflected by each of the first recording area 11A1 and the second recording area 11A2. Therefore, the side of the display label 10 on which light is incident is the light emission side and also the viewing side of the display label 10 . A first observation point OB1 and a second observation point OB2 are set on the observation side of the display label 10 . The second observation point OB2 is different from the first observation point OB1 in the space on the observation side of the display label 10 .

The first recording area 11A1 emits light to a first range, which is a predetermined range on the viewing side of the display label 10 . The light emitted from the first recording area 11A1 has an intensity distribution within the first range. The first recording area 11A1 emits the reflected light RL1 with the highest intensity in the first emission direction FD, which is the direction toward the first observation point OB1. Therefore, when the viewer of the display label 10 views the display label 10 from the first observation point OB1, the stereoscopic image displayed by the first recording area 11A1 can be viewed with the highest brightness.

On the other hand, each second recording area 11A2 emits light to a second range, which is a predetermined range on the viewing side of the display label 10. As shown in FIG. The second range is a range different from the first range. The second range is composed of a region that overlaps with the first range and a region that does not overlap with the first range. The light emitted from each second recording area 11A2 has an intensity distribution within the second range. The second recording area 11A2 emits the reflected light RL2 with the highest intensity in the second emission direction SD, which is the direction toward the second observation point OB2. Therefore, when the viewer of the display label 10 views the display label 10 from the second observation point OB2, the stereoscopic image displayed by the second recording area 11A2 can be viewed with the highest brightness.

On the other hand, the intensity of the reflected light RL1 emitted from the first recording area 11A1 in the second emission direction SD is the same as the intensity of the reflected light RL1 emitted from the first recording area 11A1 in the first emission direction FD, and the intensity of the reflected light RL1 emitted from the first recording area 11A1 in the first emission direction FD. The intensity of the area 11A2 is relatively low with respect to the intensity of the reflected light RL2 emitted in the second emission direction SD. Further, the intensity of the reflected light RL2 emitted from each second recording area 11A2 in the first emission direction FD is equal to the intensity of the reflected light RL2 emitted from the second recording area 11A2 in the second emission direction SD, and the intensity of the reflected light RL2 emitted from the second recording area 11A2 in the second emission direction SD 11A1 is relatively low with respect to the intensity of the reflected light RL1 emitted in the first emission direction FD.

FIG. 6 shows the planar structure of the display label 10 when the display label 10 is observed from the first observation point OB1. On the other hand, FIG. 7 shows the planar structure of the display label 10 when the display label 10 is observed from the second observation point OB2. 6 and 7, for convenience of illustration, the edge 11E of the first recording area 11A1 and the edge 12E of the first reflecting portion 12A are indicated by one solid line. 6 and 7, for convenience of illustration, the edge 11E of the second recording area 11A2 and the edge 12E of the second reflecting section 12B are indicated by one solid line.

As shown in FIG. 6, since the display label 10 is observed from the first observation point OB1, a stereoscopic image recorded by the inclined surface A11 of the first recording area 11A1 is observed. As described above, the first recording area 11A1 is covered with the first reflecting portion 12A having a shape that follows the edge 12E of the first recording area 11A1. The brightness of the reflected light RL1 emitted from the first recording area 11A1 is higher than when the first recording area 11A1 is not covered with the recording area 11A1. On the other hand, since the reflected light RL2 emitted from each second recording area 11A2 is hardly observed at the first observation point OB1, the second recording area 11A2 has a substantially uniform luminance and is the same as the first recording area. It is observed as a region with a luminance lower than that of 11A1.

At this time, the first recording area 11A1 and the second recording area 11A2 are covered with the reflecting portions 12A and 12B that follow the recording areas 11A1 and 11A2, while the flat areas located between the recording areas 11A1 and 11A2 11B is barely covered by the reflective layer 12 . Therefore, when the first recording area 11A1 is observed from the first observation point OB1, the brightness of the reflected light emitted from the flat area 11B surrounding the first recording area 11A1 is the brightness of the reflected light emitted from the first recording area 11A1. Very low relative to the brightness of light RL1. As a result, the contrast between the brightness of the first recording area 11A1 and the brightness of the flat area 11B positioned around it is increased, and as a result, the stereoscopic image recorded in the first recording area 11A1 stands out. It is possible to enhance the sense of depth of the image.

As shown in FIG. 7, since the display label 10 is observed from the second observation point OB2, a stereoscopic image recorded by the diffraction grating A21 provided in the second recording area 11A2 is observed. As described above, the second recording area 11A2 is covered with the second reflecting section 12B having a shape that follows the edge 12E of the second recording area 11A2. The brightness of the reflected light RL2 emitted from the second recording area 11A2 is higher than when the second recording area 11A2 is not covered with the second recording area 11A2. On the other hand, since the reflected light RL1 emitted by the first recording area 11A1 is hardly observed at the second observation point OB2, the first recording area 11A1 has a substantially uniform luminance and the second recording area 11A2 observed as a region with a lower luminance than

At this time, the first recording area 11A1 and the second recording area 11A2 are covered with the reflecting portions 12A and 12B that follow the recording areas 11A1 and 11A2, while the flat areas located between the recording areas 11A1 and 11A2 11B is barely covered by the reflective layer 12 . Therefore, when the second recording area 11A2 is observed from the second observation point OB2, the brightness of the reflected light emitted from the flat area 11B surrounding the second recording area 11A2 is Very low relative to the brightness of light RL2. As a result, the contrast between the brightness of the second recording area 11A2 and the brightness of the flat area 11B positioned around it is increased, and as a result, the stereoscopic image recorded in the second recording area 11A2 stands out. It is possible to enhance the sense of depth of the image.

As described above, according to the display label 10, the three-dimensional image displayed by the display label 10 is obtained when the display label 10 is observed from the first observation point OB1 and when the display label 10 is observed from the second observation point OB2. is different. Therefore, it is possible to easily determine the authenticity of the display label 10 by verifying whether or not the stereoscopic image displayed by the display label 10 is different by changing the observation point from which the display label 10 is observed. .

Further, according to the display label 10, the reflecting portions 12A and 12B have shapes that follow the respective recording areas 11A1 and 11A2. Therefore, the display label 10 cannot be forged without using a patterning technique capable of forming the reflecting portions 12A and 12B having shapes that follow the recording areas 11A1 and 11A2. Therefore, counterfeiting of the display label 10 is more difficult than the display label having the reflective layer 12 over the entire recording surface 11S, and as a result, counterfeiting of the display label 10 can be further suppressed.

[Structure of display label in comparative example]
The structure of the display label of the comparative example will be described with reference to FIG.
As shown in FIG. 8, the display label 20 of the comparative example has a recording layer 11 having the same shape as the display label 10 described above. On the other hand, the display label 20 has a reflective layer 22 that covers substantially the entire recording surface 11S of the recording layer 11 . The reflective layer 22 covers not only the first recording area 11A1 and the second recording area 11A2 on the recording surface 11S, but also the flat area 11B located between the recording areas 11A1 and 11A2. Therefore, the reflective layer 22 does not have a shape related to each of the recording areas 11A1 and 11A2.

[Action in display label of comparative example]
The operation of the display label 20 of the comparative example will be described with reference to FIGS. 9 and 10. FIG. As described above, since the display label 20 has the same recording layer 11 as the display label 10 of the first embodiment, the first recording area 11A1 has the highest luminance with respect to the first observation point OB1. The second recording area 11A2 emits the reflected light RL2 having the highest brightness with respect to the second observation point OB2.

FIG. 9 shows the planar structure of the display label 20 when the display label 20 is observed from the first observation point OB1. FIG. 10 explains the planar structure of the display label 20 when the display label 20 is observed from the second observation point OB2.

As shown in FIG. 9, since the display label 20 is observed from the first observation point OB1, a stereoscopic image recorded by the inclined surface A11 of the first recording area 11A1 is observed. However, since the display label 20 includes the reflective layer 22 covering substantially the entire recording surface 11S, when the first recording area 11A1 is observed from the first observation point OB1, the flat area 11B surrounding the first recording area 11A1 Reflected light with high luminance is also emitted from the . As a result, the contrast between the brightness of the first recording area 11A1 and the brightness of the flat area 11B located around it is less likely to occur, and as a result, the stereoscopic image recorded in the first recording area 11A1 is reflected by the reflective layer 22. inconspicuous against reflected light.

As shown in FIG. 10, since the display label 20 is observed from the second observation point OB2, a stereoscopic image recorded by the diffraction grating A21 provided in the second recording area 11A2 is observed. However, since the display label 20 includes the reflective layer 22 covering substantially the entire recording surface 11S, when the second recording area 11A2 is observed from the second observation point OB2, the flat area 11B surrounding the second recording area 11A2 Reflected light with high luminance is also emitted from the . As a result, the contrast between the luminance of the second recording area 11A2 and the luminance of the flat area 11B positioned around it is less likely to occur, and as a result, the stereoscopic image recorded in the second recording area 11A2 is reflected by the reflective layer 22. inconspicuous against reflected light.

[Item structure]
The structure of the article will be described with reference to FIGS. 11 to 13. FIG. In addition, below, the case where articles|goods are materialized as a card is demonstrated. The card may be a credit card, a loyalty card, a driver's license, an ID card, and the like. The ID card can be a national ID card or the like. FIG. 11 illustrates the planar structure of the card viewed from the direction facing the surface of the card. FIG. 12 illustrates the planar structure of the card viewed from the direction facing the back surface of the card.

As shown in FIG. 11, the card 30 comprises a display label 10 and a plastic plate 31 supporting the display label 10. As shown in FIG. The plastic plate 31 has a plate shape and includes a front surface 31F and a back surface 31R opposite to the front surface 31F. The display label 10 is attached to the surface 31F of the plastic plate 31. As shown in FIG. Alternatively, the display label 10 may be embedded inside the plastic plate 31 .

In the plastic plate 31, when viewed from the thickness direction of the display label 10, at least the portion overlapping the first recording area 11A1 is transparent. In this embodiment, the plastic plate 31 has a transparent window 31A. The transparent window 31A is part of the plastic plate 31 and may have a rectangular shape in a plan view facing the surface 31F. The transparent window 31A has transparency to transmit light between the front surface 31F and the rear surface 31R of the plastic plate 31 . In a plan view facing the surface 31F, the transparent window 31A overlaps the first recording area 11A1 and has an area larger than the entire first recording area 11A1. Parts of the plastic plate 31 other than the transparent window 31A are translucent or opaque.

As shown in FIG. 12, when viewed from the direction facing the back surface 31R of the plastic plate 31, the first recording area 11A1 of the display label 10 can be observed through the transparent window 31A. Therefore, the observer of the card 30 can see the display label 10 both when viewing the display label 10 from the direction facing the front surface 31F of the plastic plate 31 and when viewing the display label 10 from the direction facing the back surface 31R of the plastic plate 31. , it is possible to observe a stereoscopic image recorded in the first recording area 11A1.

FIG. 13 shows the cross-sectional structure of the display label 10 along a plane perpendicular to the plane in which the display label 10 extends.
As shown in FIG. 13, when the display label 10 is attached to the plastic plate 31 that supports the display label 10, the display label 10 includes the base material 13 and the adhesive layer in addition to the recording layer 11 and the reflective layer 12. 14. The base material 13 supports the recording layer 11 and suppresses physical damage and chemical damage to the recording layer 11 . The base material 13 has a light transmittance that allows the stereoscopic image recorded on the recording layer 11 to pass therethrough. The adhesive layer 14 adheres the display label 10 to the plastic plate 31 . The adhesive layer 14 has a light transmittance that allows the stereoscopic image recorded on the recording layer 11 to pass therethrough.

[Manufacturing method of display label]
The display label 10 described above can be manufactured by the method described below.
[Recording layer 11]
The recording layer 11 is formed by applying a coating liquid for forming the recording layer 11 to a substrate supporting the recording layer 11 . The coating method for forming the recording layer 11 may be gravure coating, reverse gravure coating, die coating, lip coating, micro gravure coating, or the like.

Materials forming the recording layer 11 may be thermoplastic resins, thermosetting resins, and UV or electron beam curing resins. Thermoplastic resins may be acrylic, epoxy, cellulosic, and vinyl resins. The thermosetting resin may be a melamine-based resin, a phenol-based resin, or a cross-linked urethane resin obtained by adding a polyisocyanate as a cross-linking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group. UV or electron beam curable resins may be epoxy (meth)acrylics and urethane (meth)acrylates.

Both the first recording area 11A1 and the second recording area 11A2 are formed on the recording surface 11S by, for example, the following method. First, a relief plate is prepared for forming the inclined surface A11 provided in the first recording area 11A1 and the diffraction grating A21 provided in the second recording area 11A2. When creating a relief plate, an electron beam curable resin is prepared. Next, a part of the electron beam curable resin is exposed by irradiating the electron beam curable resin with an electron beam in a predetermined pattern. A master plate can be obtained by developing the electron beam curable resin after exposure. Subsequently, by forming a metal thin film on the surface of the master plate using an electroplating method, the uneven pattern of the master plate is replicated. Thereby, a metal relief plate can be obtained. Then, the recording layer 11 having the recording surface 11S can be obtained by thermocompression bonding a relief plate to the cured coating layer. Alternatively, the recording layer 11 having the recording surface 11S can be formed by curing the coating layer while the relief plate is in close contact with the coating layer before curing.

The recording layer 11 having the recording surface 11S can also be formed by cutting one surface of the precursor layer of the recording layer 11 .
The diffraction grating A21 provided in the second recording area 11A2 is, for example, an interference fringe formed by irradiating the scattering light obtained by applying light with high coherence to the object and irradiating the reference light from the same light source. is recorded on a photosensitive material. Alternatively, the diffraction grating A21 provided in the second recording area 11A2 may be based on a structure previously obtained by simulation using a computer.

On the other hand, in the first recording area 11A1, the shape of the stereoscopic image recorded in the first recording area 11A1 is determined by the height of the inclined surface A11, the width of the inclined surface A11, and the azimuth angle of the inclined surface A11. It is possible to control In other words, the normal vector of the inclined plane A11 can be the direction in which the virtual planes forming the stereoscopic image to be displayed face.

[Reflection layer 12]
The reflective layer 12 can be metal. Metals of the reflective layer 12 may be aluminum, silver, tin, chromium, nickel, copper, gold, and brass. Alternatively, the metal or alloy for forming the reflective layer 12 can be formed by physical deposition or chemical deposition. Physical deposition can be vacuum evaporation and sputtering.

The reflective layer 12 having the reflective portions 12A and 12B having shapes following the first recording area 11A1 and the second recording area 11A2 can be formed by any of the methods listed below. Moreover, any two or more of the following methods may be combined.

In the first method, a predetermined printing method is used to form the reflecting portions 12A and 12B having shapes that follow the shapes of the respective recording areas 11A1 and 11A2. In the second method, the reflective portions 12A and 12B are deposited using a mask having openings that follow the shape of the first recording area 11A1 and openings that follow the shape of the second recording area 11A2, or It is formed by coating. As a result, the reflecting portions 12A and 12B having shapes following the shapes of the recording areas 11A1 and 11A2 other than the portions masked by the mask can be formed.

In the third method, first, a resin soluble in a solvent is applied to areas other than the first recording area 11A1 and the second recording area 11A2 on the recording surface 11S. Next, the reflective layer 12 is formed on the entire recording surface 11S, that is, on both the portion covered with the soluble resin and the portion not covered with the soluble resin in the recording surface 11S. A thin film is formed to Next, by using a solvent, the area formed on the resin in the thin film is removed from the recording surface 11S together with the resin. As a result, the reflecting portions 12A and 12B having shapes following the shapes of the recording areas 11A1 and 11A2 other than the resin-covered areas can be formed.

In the fourth method, first, areas other than the first recording area 11A1 and the second recording area 11A2 are formed on the recording surface 11S by using a resin that is easier to peel off from the recording surface 11S than the thin film for forming the reflective layer 12. Then, a resin layer is formed. Next, a thin film for forming the reflective layer 12 is formed on the entire recording surface 11S. Then, by pressing an adhesive roll or adhesive paper against the thin film on the recording surface 11S, the resin layer is transferred to the adhesive sheet or adhesive paper. Thereby, the reflecting portions 12A and 12B having shapes that follow the respective recording areas 11A1 and 11A2 can be formed.

In the fifth method, first, a thin film for forming the reflective layer 12 is formed over the entire recording surface 11S. Next, a resin layer having chemical resistance is formed on the thin film so as to have a shape following the first recording area 11A1 and the second recording area 11A2. Then, the portion of the thin film exposed from the resin layer is dissolved by using an alkaline etchant or an acidic etchant. In this case, after partially dissolving the thin film, the chemical-resistant resin layer may or may not be removed from the reflective layer 12 . By placing a chemical-resistant resin layer on the reflective layer 12 , the resin layer can be used as a protective layer to protect the reflective layer 12 or a printing layer to decorate the reflective layer 12 . As a result, the reflecting portions 12A and 12B having shapes following the shapes of the recording areas 11A1 and 11A2 in the areas where the resin was formed can be formed.

In the sixth method, first, a thin film for forming the reflective layer 12 is formed over the entire recording surface 11S. The entire thin film is then covered with a photosensitive resin. After that, the photosensitive resin layer is exposed and developed according to the shapes of the first recording area 11A1 and the second recording area 11A2. If the photopolymer layer is negative acting, the photopolymer remains in the exposed areas. If the photopolymer layer is positive acting, the photopolymer remains in the areas that have not been exposed to light. Then, the portion of the thin film exposed from the photosensitive resin layer is dissolved by using an alkaline etchant or an acidic etchant. In this case, as in the fifth method, the photosensitive resin layer may or may not be removed from the reflective layer 12 after partially dissolving the thin film. By positioning the photosensitive resin layer on the reflective layer 12 , the photosensitive resin layer can be used as a protective layer for protecting the reflective layer 12 or a printing layer for decorating the reflective layer 12 . As a result, the reflecting portions 12A and 12B having shapes following the shapes of the recording areas 11A1 and 11A2 in which the resin remains after the development can be formed.

In the seventh method, first, a thin film for forming the reflective layer 12 is formed over the entire recording surface 11S. Next, the portion of the thin film other than the portion covering the first recording area 11A1 and the portion covering the second recording area 11A2 is removed from the recording surface 11S by irradiating the thin film with a laser beam. As a result, the reflecting portions 12A and 12B having shapes following the shapes of the recording areas 11A1 and 11A2 other than the areas irradiated with the laser beam can be formed.

[Base material 13]
If the display label 10 comprises a substrate 13, the substrate 13 may be a transparent polymeric resin film. Materials forming the polymer resin film may be vinyl chloride resin, polyethylene terephthalate resin, nylon resin, polyethylene resin, polypropylene resin, polyolefin resin, ABS resin, polycarbonate resin, and polyethylene naphthalate resin.

[Adhesion layer 14]
When the display label 10 includes the adhesive layer 14 , the adhesive layer 14 is formed by coating the recording surface 11</b>S of the recording layer 11 . The application method for forming the adhesive layer 14 may be an offset printing method, a gravure printing method, a letterpress printing method, or a screen printing method.

Materials for forming the adhesive layer 14 include starch-based, methylcellulose-based, carboxycellulose-based, hydroxyethylcellulose-based, polyvinyl alcohol-based, polyvinylpyrrolidone-based, vinyl ethyl ether-maleic anhydride copolymer-based, polyacrylic acid-based, and polyethylene. It may be an oxide-based adhesive or pressure-sensitive adhesive. The material forming the adhesive layer 14 may be a pressure sensitive material and a heat sensitive material.

[Experimental result]
[Experimental result 1]
A polyethylene terephthalate film having a thickness of 25 μm was prepared as the substrate 13 . Next, the following ink was applied to the base material 13 by gravure printing, and the applied layer was dried to obtain a precursor layer of the recording layer 11 having a thickness of 1.5 μm. Then, a recording layer 11 having a recording surface 11S was obtained by thermocompression bonding a relief plate for forming the first recording area 11A1 and the second recording area 11A2.

[Ink for recording layer]
Acrylic resin 18.0 parts by weight Silane coupling agent 2.0 parts by weight Methyl ethyl ketone 80.0 parts by weight

An aluminum film having a thickness of 80 nm was formed on the entire recording surface 11S using a vacuum deposition method. Next, a photosensitive layer having a thickness of 5 μm was obtained by applying a photosensitive agent to the entire aluminum film using a screen printing method and then drying the applied layer. Then, the photosensitive layer was exposed using an exposure mask. Next, the aluminum film was etched while developing the photosensitive layer using a developing solution. Subsequently, by removing the photosensitive layer from the aluminum film using a peeling solution, a first reflecting portion 12A having a shape following the first recording area 11A1 and a second reflecting portion 12A having a shape following the second recording area 11A2 are formed. A reflective layer 12 composed of two reflective portions 12B was obtained.

After the following ink was applied to the entire recording surface 11S using a gravure printing method, the applied layer was dried to form an adhesive layer 14 having a thickness of 7 μm. Thus, the display label 10 of Experiment Result 1 was obtained. Then, a card 30 of Experiment Result 1 was obtained by pasting the display label 10 onto a plastic plate 31 using a hot stamp machine.

[Ink for adhesive layer]
Vinyl chloride resin 30.0 parts by weight Ethyl acetate 50.0 parts by weight Toluene 20.0 parts by weight

[Comparison result 1]
A display label 20 of Comparative Result 1 was obtained in the same manner as in Experimental Result 1, except that in the display label 10 of Experimental Result 1, the aluminum film formed on the entire recording surface 11S was used as the reflective layer 22 . Further, a card of Comparative Result 1 was obtained by attaching the display label 20 of Comparative Result 1 to the plastic plate 31 in the same manner as in Experimental Result 1. FIG.

[Evaluation results]
In the card 30 of Experiment Result 1, the brightness of the 3D image recorded in the first recording area 11A1 and the brightness of the 3D image recorded in the second recording area 11A2 in the display label 10 of Experiment Result 1 are different for each recording area. It was found to be significantly higher than the brightness of the flat region 11B surrounding 11A1 and 11A2. As a result, the 3D image recorded in the recording areas 11A1 and 11A2 stands out from its surroundings, and as a result, the 3D image recorded on the display label 10 has a heightened sense of depth.

On the other hand, in the card of comparison result 1, the brightness of the stereoscopic image recorded in each of the recording areas 11A1 and 11A2 in the display label 10 of comparison result 1 and the brightness of the flat area 11B surrounding each of the recording areas 11A1 and 11A2 It was found that the stereoscopic images recorded in the respective recording areas 11A1 and 11A2 were inconspicuous due to the small difference in .

As described above, according to the display label and the first embodiment of the article, the following visual effects and productivity can be obtained.
(1) Since the reflective portions 12A and 12B have shapes that follow the contours of the recording areas 11A1 and 11A2, the contrast between the luminance of the recording areas 11A1 and 11A2 and the luminance of the flat area 11B surrounding the recording areas 11A1 and 11A2 is increased. It is possible to As a result, the three-dimensional image recorded in the recording areas 11A1 and 11A2 stands out from the flat area 11B, thereby enhancing the sense of depth of the three-dimensional image.

(2) An observer observing the display label 10 cannot observe the edges 11E of the recording areas 11A1 and 11A2 and the edges 12E of the reflecting portions 12A and 12B separately. Therefore, the observer recognizes that the shape of the recording areas 11A1 and 11A2 and the shape of the reflecting portions 12A and 12B are the same. As a result, the contrast between the stereoscopic image recorded in the recording areas 11A1 and 11A2 and its surroundings is enhanced. As a result, the sense of depth of the stereoscopic images recorded in the recording areas 11A1 and 11A2 is enhanced.

(3) An observer who observes the display label 10 is more likely to recognize that the recording areas 11A1 and 11A2 and the reflecting portions 12A and 12B have the same shape when viewed from the thickness direction of the recording layer 11 . As a result, the contrast between the stereoscopic image recorded in the recording areas 11A1 and 11A2 and its surroundings is enhanced. As a result, the sense of depth of the stereoscopic images recorded in the recording areas 11A1 and 11A2 is enhanced.

(4) Since the reflective portions 12A and 12B are larger than the recording areas 11A1 and 11A2 when viewed from the thickness direction of the recording layer 11, the relative positional deviation of the reflective portions 12A and 12B with respect to the recording areas 11A1 and 11A2 occurs. Even so, the entire recording areas 11A1 and 11A2 are likely to be covered with the reflecting portions 12A and 12B.

(5) Since the reflective portions 12A and 12B are smaller than the recording areas 11A1 and 11A2 when viewed from the thickness direction of the recording layer 11, the relative positional deviation of the reflective portions 12A and 12B with respect to the recording areas 11A1 and 11A2 occurs. Even so, it becomes difficult for the reflecting portions 12A and 12B to protrude from the edges 11E of the recording areas 11A1 and 11A2 to the extent that the observer can visually recognize them.

It should be noted that the above-described embodiment can be implemented with appropriate modifications as follows.
[Recording layer]
- The recording layer 11 may include only one of the first recording area 11A1 and the second recording area 11A2. Even in this case, it is possible to obtain a sense of depth in the same way as in (1) above.

[Reflection layer]
The reflective layer 12 has a shape following the recording areas 11A1 and 11A2 when viewed from the thickness direction of the recording layer 11, and the recording areas 11A1 and 11A2 extend over the entire edges 11E of the recording areas 11A1 and 11A2. and each of the distances DIS1 and DIS2 may be greater than 1 mm and equal to or less than 3 mm. In this case, the portion of the reflective layer 12 located outside the edge 11E of each of the recording areas 11A1 and 11A2 is observed in a state separated from the edge of the stereoscopic image displayed by each of the recording areas 11A1 and 11A2. be done. Therefore, the portions of the reflective layer 12 located outside the edges 11E of the recording areas 11A1 and 11A2 frame the stereoscopic images displayed by the recording areas 11A1 and 11A2, thereby improving the design of the stereoscopic images. Increased.

The edge 12E of each of the reflecting portions 12A and 12B is the portion positioned inside the edge 11E of the recording area 11A1 and 11A2 and and portions located outside the edge 11E of 11A1 and 11A2. Even in this case, if the conditions 1 and 2 described above are satisfied, it is possible to obtain a sense of depth in the same way as in (2) described above.

[Print layer]
- The display label 10 may include a print layer in addition to the recording layer 11, the reflective layer 12, the substrate 13, and the adhesive layer 14. The display label 10 can have a printed layer on a portion other than between the recording layer 11 and the reflective layer 12 . Ink containing various dyes and pigments can be used as the ink for forming the printed layer. The method for forming the printing layer may be letterpress printing, gravure printing, offset printing, and screen printing. By providing the display label 10 with a printed layer, it is possible to improve the design of the display label 10 and improve the anti-counterfeiting property of the display label 10 compared to the case where the display label 10 does not have a printed layer. is.

[Goods]
- The display label 10 may be embedded in a recess that the front surface 31F or the rear surface 31R of the plastic plate 31 has. In this case, the adhesive for forming the above-described adhesive layer may be applied to the wall surfaces defining the recesses of the plastic plate 31, or the adhesive may not be applied.

- The plastic plate 31 of the card 30 may not have the transparent window 31A. In this case the entire plastic plate 31 is translucent or opaque.
- The article to which the display label 10 is attached may be an article other than the card described above. The article may be an article whose authenticity is certified by the display label 10, or may be various certificates.

[Second embodiment]
A second embodiment of the display label and article will now be described with reference to FIGS. 14-16. The second embodiment differs from the first embodiment in that the display label has a transparent reflective layer. Therefore, in the following, while the differences between the second embodiment and the first embodiment will be described in detail, the same reference numerals will be given to the configurations in the second embodiment that are common to the first embodiment. Description is omitted. Also, the structure of the display label, the action of the display label, the manufacturing method of the display label, and the experimental results will be described in order below.

[Display label structure]
The structure of the display label will be described with reference to FIG.
As shown in FIG. 14, the display label 40 has a recording layer 41 and a reflective layer 42 . The recording layer 41 corresponds to the recording layer 11 included in the display label 10 of the first embodiment. In the recording layer 41, the recording surface 41S corresponds to the recording surface 11S of the first embodiment, the first recording area 41A1 corresponds to the first recording area 11A1 of the first embodiment, and the second recording area 41A2 corresponds to the first recording area 41A1. It corresponds to the second recording area 11A2 of one embodiment. In the recording layer 41, a flat area 41B corresponds to the flat area 11B of the first embodiment. The reflective layer 42 is different from the reflective layer 12 of the first embodiment in that it is positioned only on the first recording area 41A1.

When viewed from the thickness direction of the recording layer 41, the transparent reflective layer 43 is covered by the reflective layer 42 on the surface of the reflective layer 42 opposite to the surface facing the first recording area 41A1 and on the recording surface 41S. It covers the part that is not covered. The difference between the refractive index of the transparent reflective layer 43 and the refractive index of the recording layer 41 is 0.2 or more. The transparent reflective layer 43 has transmissivity for transmitting the light that has entered the transparent reflective layer 43 , and the difference between the refractive index of the transparent reflective layer 43 and the refractive index of the recording layer 41 causes the incident light to enter the transparent reflective layer 43 . It is possible to reflect the reflected light.

[Effect of display label]
The action of the display label 40 will be described with reference to FIGS. 15 and 16. FIG. FIG. 15 shows the planar structure of the display label 40 when the display label 40 is observed from the first observation point OB1. On the other hand, FIG. 16 shows the planar structure of the display label 40 when the display label 40 is observed from the second observation point OB2. 15 and 16, as in FIGS. 6 and 7, for convenience of illustration, the edge of the first recording area 41A1 and the portion of the edge of the reflective layer 42 overlapping the edge of the first recording area 41A1 are shown. It is indicated by one solid line.

As shown in FIG. 15, the first recording area 41A1 has the same shape as the first recording area 11A1 of the first embodiment. One of the two second recording areas 41A2 has a heart shape. The other of the two second recording areas 41A2 has a star shape.

Since the display label 40 is observed from the first observation point OB1, a stereoscopic image recorded by the inclined surface A11 provided in the first recording area 41A1 is observed as in the display label 10 of the first embodiment. Since the first recording area 41A1 is covered with the reflective layer 42 having a shape that follows the edge 41E of the first recording area 41A1, compared to the case where the first recording area 41A1 is not covered with the reflective layer 42, , the brightness of the reflected light emitted from the first recording area 41A1 is high.

On the other hand, the reflected light emitted from each second recording area 41A2 is hardly observed at the first observation point OB1. Moreover, since each second recording area 41A2 is covered with the transparent reflective layer 43, when the second recording area 41A2 is observed from the first observation point OB1, the second recording area 41A2 is almost transparent. is. Therefore, the second recording area 41A2 is indistinguishable from the flat area 41B surrounding the second recording area 41A2. As a result, the stereoscopic image recorded in the first recording area 41A1 stands out more.

As shown in FIG. 16, since the display label 40 is observed from the second observation point OB2, a stereoscopic image recorded by the diffraction grating A21 provided in the second recording area 41A2 is observed. Since each second recording area 41A2 is covered with the transparent reflective layer 43 instead of the metallic reflective layer 42, the diffracted light emitted from the diffraction grating A21 is superimposed on the transparent layer instead of the metallic luster. , the stereoscopic image recorded in the second recording area 41A2 is observed.

[Manufacturing method of display label]
The display label 40 described above differs from the display label 10 of the first embodiment in that it includes a transparent reflective layer 43 . Therefore, hereinafter, while the step of forming the transparent reflective layer 43 in the method of manufacturing the display label 40 will be described in detail, the explanation of the steps of forming other layers will be omitted.

The transparent reflective layer 43 is a transparent thin film having a higher refractive index than the recording layer 41 . The refractive index of the transparent reflective layer 43 is higher than that of the recording layer 41 by 0.2 or more, preferably 2.0 or more.

The transparent reflective layer 43 can be a dielectric. The dielectric can be a metal compound or silicon oxide. Metal compounds can be metal oxides, metal sulfides, metal fluorides, metal nitrides, metal halides, and the like. Materials for forming the transparent reflective layer 43 may be the materials listed below. Materials for forming the transparent reflective layer 43 include _{Sb2O3 , Fe2O3} , _TiO2 , CdS, _CeO2 , ZnS, _{PbCl2 ,} CdO, _WO3 , SiO _{, Si2O3} , _In2O . ₃ , PbO, _Ta2O3 , ZnO, _ZrO2 , MgF _, CaF, and GaN. The transparent reflective layer 43 can be formed by a deposition method. The deposition method can be a physical deposition method or a chemical deposition method. Physical deposition methods can be vacuum deposition and sputtering. Also, the transparent reflective layer 43 can be a single layer or multiple layers. The multilayer transparent reflective layer 43 can be made by alternately depositing dielectrics with different refractive indices. The thickness of the transparent reflective layer 43 may be 5 nm or more and 1000 nm or less.

[Experimental result]
[Experimental result 2]
In the display label 10 of the experimental result 1, the display label 40 of the experimental result 2 and the card of the experimental result 2 were obtained by the same method as the experimental result 1, except that the following points were changed. That is, in Experimental result 2, the reflective layer 42 having a shape following the first recording area 11A1 was formed, but the reflective layer 42 was not formed on the second recording area 41A2. Next, a Si ₂ O ₃ film having a thickness of 100 nm was formed as a transparent reflective layer 43 on both the area covered with the reflective layer 42 and the area not covered with the reflective layer 42 on the recording surface 11S. . A vacuum deposition method was used to form the Si ₂ O ₃ film.

[Comparison result 2]
Comparative result 2 was obtained in the same manner as in experimental result 2, except that the aluminum film formed on the entire recording surface 11S was used as the reflective layer and the transparent reflective layer 43 was not formed in the display label 40 of experimental result 2. got the display label. In addition, by attaching a display label of Comparative Result 2 to the plastic plate 31 in the same manner as Experimental Result 1, a card of Comparative Result 2 was obtained.

[Evaluation results]
In the card of Experimental Result 2, the brightness of the stereoscopic image recorded in the first recording area 41A1 in the display label 40 of Experimental Result 2 was the same as that of the flat area 11B surrounding the first recording area 41A1 and the brightness of the second recording area 41A2. was found to be significantly higher than As a result, it was recognized that the sense of depth of the stereoscopic image recorded in the first recording area 41A1 was enhanced.

The stereoscopic image recorded in the second recording area 41A2 is an image in which the diffracted light emitted by the diffraction grating A21 is superimposed on the transparent layer, and thus the stereoscopic image of the first recording area 41A1 is observed with metallic luster. It was observed that an image different in appearance from the image was observed. It was also recognized that the depth feeling of the stereoscopic images recorded in the respective recording areas 41A1 and 41A2 is heightened by such a difference between the stereoscopic images.

On the other hand, in the card of comparison result 2, the brightness of the stereoscopic image recorded in each of the recording areas 41A1 and 41A2 in the display label of comparison result 1 and the brightness of the flat area 41B surrounding each of the recording areas 41A1 and 41A2 are different. It was found that the stereoscopic images recorded in the respective recording areas 41A1 and 41A2 were inconspicuous because the difference was small.

As described above, according to the second embodiment of the display label and article, in addition to the visual effects and productivity of (1) to (5) described above, the visual effects described below can be obtained.
(6) The reflective layer 42 enhances the sense of depth of the stereoscopic image recorded in the first recording area 41A1, and the stereoscopic image recorded in the second recording area 41A2 is reflected by the refractive index of the recording layer 41 and the transparent reflective layer 43. It is possible to display by reflection of light due to the difference between the refractive indices of .

In addition, the above-described second embodiment can be implemented with the following changes.
[Transparent reflective layer]
The difference between the refractive index of the recording layer 41 and the refractive index of the transparent reflective layer 43 should be 0.2 or more. It can be low. Even in this case, the effect according to (6) described above can be obtained.

- The transparent reflective layer 43 may have a shape that follows each second recording area 41A2. Even in this case, it is possible to obtain the same visual effect as in (6) above.

Technical ideas derived from the above embodiments and modifications are added below.
[Appendix 1]
The display label according to any one of claims 1 to 6, wherein the reflective layer has an optical density of 1.0 or more.

According to the above configuration, the reflectance of the reflective layer is higher than when the optical density of the reflective layer is less than 1.0, thereby enhancing the contrast between the reflective layer and the flat area located around it. be done.

[Appendix 2]
The recording area is
a plurality of inclined surfaces formed at a predetermined angle with respect to the flat region, comprising a first inclined surface and a second inclined surface having an angle different from that of the first inclined surface with respect to the flat region; a first recording area comprising the plurality of inclined surfaces, or
7. The display label according to any one of Claims 1 to 6 or Appendix 1, which is a second recording area having a diffraction grating.

According to the above configuration, whether the recording area is the first recording area or the second recording area, the sense of depth of the stereoscopic image recorded in the recording area can be enhanced.

[Appendix 3]
The recording area is a first recording area, and the first recording area includes a plurality of inclined surfaces inclined at a predetermined angle with respect to the flat area, and the plurality of inclined surfaces are composed of a first inclined surface and a first inclined surface. wherein the direction in which the first inclined surface emits the light incident on the first inclined surface is different from the direction in which the second inclined surface emits the light incident on the second inclined surface,
the recording surface further includes a second recording area having a diffraction grating for recording a stereoscopic image;
The reflective layer includes a first reflective portion having a shape following the outline of the first recording area and a second reflective portion having a shape following the outline of the second recording area when viewed from the thickness direction of the recording layer. 7. The display label according to any one of claims 1 to 6 or claim 1, comprising a reflective portion.

According to the above configuration, the sense of depth can be enhanced for both the stereoscopic image recorded in the first recording area and the stereoscopic image recorded in the second recording area.

[Appendix 4]
The recording area is a first recording area, and the first recording area includes a plurality of inclined surfaces inclined at a predetermined angle with respect to the flat area, and the plurality of inclined surfaces are composed of a first inclined surface and a first inclined surface. wherein the direction in which the first inclined surface emits the light incident on the first inclined surface is different from the direction in which the second inclined surface emits the light incident on the second inclined surface,
the recording surface further includes a second recording area having a diffraction grating for recording a stereoscopic image;
the reflective layer has a shape following the outer shape of the first recording area when viewed from the thickness direction of the recording layer;
When viewed from the thickness direction of the recording layer, the surface of the reflective layer opposite to the surface facing the first recording area and the portion of the recording surface not covered by the reflective layer 7. The method according to any one of claims 1 to 6, or according to appendix 1, further comprising a covering transparent reflective layer, wherein the difference between the refractive index of the transparent reflective layer and the refractive index of the recording layer is 0.2 or more. label.

According to the above configuration, the reflective layer enhances the sense of depth of the 3D image recorded in the first recording area, and the 3D image recorded in the second recording area has the refractive index of the recording layer and the refractive index of the transparent reflective layer. It is possible to display by the reflection of light due to the difference in the index.

[Appendix 5]
A first emission direction in which the light that has entered the first recording area is emitted from the first recording area is different from a second emission direction in which the light that has entered the second recording area is emitted from the second recording area. Labels as described in appendix 3 or 4.

According to the above configuration, the display label can display the stereoscopic image recorded in the first recording area and the stereoscopic image recorded in the second recording area in different directions. Therefore, when determining the authenticity of a display label from a stereoscopic image recorded on the display label, it is necessary to determine whether or not the stereoscopic image displayed by the display label changes due to a change in the relative position of the observation point with respect to the display label. Judge. Therefore, it is easy to determine the authenticity of the display label.

[Appendix 6]
8. The article according to claim 7, wherein at least a portion of the plastic plate overlapping with the recording area is transparent when viewed from the thickness direction of the display label.

According to the above configuration, the display label is directed toward both an observer who observes the display label from the direction facing the front surface of the plastic plate and an observer who observes the display label from the direction facing the back surface of the plastic plate. It is possible to display a stereoscopic image.

10, 20, 40... display label, 11, 41... recording layer, 11A... recording area, 11A1, 41A1... first recording area, 11A2, 41A2... second recording area, 11B, 41B... flat area, 11E, 12E, 41E... Edge 11OB... Observation surface 11S, 41S... Recording surface 12, 22, 42... Reflection layer 12A... First reflection part 12B... Second reflection part 13... Base material 14... Adhesive layer 30 Card 31 Plastic plate 31A Transparent window 31F Front surface 31R Back surface 43 Transparent reflective layer A11 Inclined surface A21 Diffraction grating LS Light source MC11, MC12 Center OB1 Third 1 observation point, OB2 . . . 2nd observation point.

Claims (7)

a recording layer having a recording surface including a recording area configured with fine unevenness for recording a stereoscopic image, and a flat area surrounding the recording area and being flatter than the recording area;
a reflective layer having a higher light reflectance than the recording layer, overlapping the recording area when viewed from the thickness direction of the recording layer, and having a shape following the outline of the recording area ;
The recording area is a first recording area,
The recording surface further includes a second recording area configured with fine unevenness for recording a stereoscopic image,
the reflective layer does not overlap the second recording area when viewed from the thickness direction of the recording layer;
When viewed from the thickness direction of the recording layer, the surface of the reflective layer opposite to the surface facing the first recording area and the portion of the recording surface not covered by the reflective layer It further comprises a covering transparent reflective layer, wherein the difference between the refractive index of the transparent reflective layer and the refractive index of the recording layer is 0.2 or more.
display label. When viewed from the thickness direction of the recording layer, in a shape that follows the outline of the first recording area, the edge of the first recording area that borders the outline of the first recording area and the outline of the reflective layer are edges. 2. The display label according to claim 1, wherein the distance between the edge of said reflective layer taken is 1 mm or less over the entire edge of said first recording area. When viewed from the thickness direction of the recording layer, in a shape that follows the outline of the first recording area, the edge of the first recording area that borders the outline of the first recording area and the outline of the reflective layer are edges. 3. The display label according to claim 1, wherein the distance between the edge of the reflective layer and the edge of the first recording area is 5% or less of the maximum width of the first recording area over the entire edge of the first recording area. A first direction and a second direction orthogonal to the first direction are set in a plane in which the display label extends,
When viewed from the thickness direction of the recording layer, the distance between the center of the circumscribing circle circumscribing the first recording area and the center of the circumscribing circle circumscribing the reflective layer is equal to the first direction and the second 4. The display label according to any one of claims 1 to 3, being 1 mm or less in any direction. The display label according to any one of claims 1 to 4, wherein the reflective layer protrudes from the first recording area over the entire edge of the first recording area when viewed from the thickness direction of the recording layer. 5. The reflective layer according to any one of claims 1 to 4, wherein the reflective layer is positioned inside the edge of the first recording area over the entire edge of the first recording area when viewed from the thickness direction of the recording layer. Display label of description. a display label according to any one of claims 1 to 6;
and a plastic plate supporting the display label.

Images