JP2003029012A - Retroreflective body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retroreflective body having sufficient adhesion property even on a curved face and useful, for example, to check whether an article is unsealed. SOLUTION: The retroreflective body has a reflective substrate layer, a stretchable layer which can be stretched in the direction parallel to the layer, and a layer of transparent microspheres disposed on the top layer side of the substrate layer. Further, a pattern layer, particularly a hologram reproducing layer is preferably laminated on the top layer side of the retroreflective body. Or, a non-stretchable layer is preferably laminated on the top layer side of the retroreflective body. Or, a non-stretchable layer is preferably laminated between the pattern layer and other layers in the retroreflective body. The stretchable layer has elasticity in the retroreflective body. Or, the stretchable layer has plasticity. Seals for confirmation of unsealing, seals for prevention of forgery and decorative seals containing the above retroreflective body are also presented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to retroreflectors, and more particularly to improvements in their constituent materials.

[0002]

2. Description of the Related Art Conventionally, a retroreflector is expensive to manufacture and prepare, requires a high level of technology to manufacture, is difficult to copy and forge, and its existence is unnoticeable. It is used for certificates such as credit cards, cash vouchers, certificates, etc. for the purpose of distinguishing between genuine products and counterfeit products and preventing forgery because it is not possible to know by just doing.

As one of the retroreflectors, one shown in FIG. 9 (a) is known. This retroreflector is used by being attached to an adherend for the purpose of distinguishing between genuine products and counterfeit products. In the retroreflector 100 shown in the figure, an interference substance layer 104 is laminated on an adhesive layer 102, and a non-stretchable resin layer 108 having a transparent microsphere layer 106 sandwiched therebetween is laminated on the interference substance layer 104. It is characterized by

Since the retroreflector receives light from various directions on the retroreflector under normal light such as sunlight or illumination light, the interference color due to the interference material layer 104 is not observed. When the light aligned in the traveling direction (this is called linear light) is irradiated, an interference color due to light interference is observed in the interference substance layer. Therefore, it is possible to discriminate between the genuine product and the counterfeit product by irradiating with the linear light. This retroreflector makes the adhesive force between the adhesive layer 102 and the adherend 130 stronger than the adhesive force between the non-stretchable resin layer 108 and the transparent microsphere layer 106, and separates above and below the transparent microsphere layer 106 at the time of peeling. (FIG. 9B), the state of retroreflective formation is destroyed,
It cannot be reused.

[0005]

However, the conventional retroreflector as shown in FIG. 9 has a problem in that after peeling, a part of the retroreflector remains on the adherend to impair the appearance. Also,
Although it is premised that the transparent microsphere layer 108 is separated above and below and cannot be reused at the time of peeling, it can be integrally peeled by using alcohol or by heating and may be reused. It was The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a retroreflector that has sufficient adhesion even to a curved surface and is useful for confirmation of opening and the like.

[0006]

In view of the above problems, the inventors of the present invention have earnestly studied, and as a result, by laminating a stretched layer on a retroreflector, the retroreflector has sufficient adhesion even to a curved surface and further stretches. The inventors have found that it can be used for various purposes by adjusting the rate and the like, and completed the present invention.

The first subject of the present invention is to include a reflective substrate layer, a stretchable layer stretchable in a direction parallel to the layer, and a transparent microsphere layer arranged on the surface side of the reflective substrate layer. It is a retroreflector characterized by. In the retroreflector, it is preferable that an extension layer having a transparent microsphere layer sandwiched therebetween is laminated on the reflection substrate layer. In the retroreflector, it is preferable that a stretched layer is laminated on the reflective substrate layer, and a transparent microsphere layer is laminated on the stretched layer.

In the retroreflector, it is preferable to further laminate a pattern layer on the surface layer side. In the retroreflector, the pattern layer is preferably a hologram reproducing layer. In the retroreflector, it is preferable to further laminate a non-stretched layer on the surface side thereof to increase mechanical strength, prevent stretching during sticking, remove the non-stretched layer after sticking, and stretch during peeling.

In the retroreflector, it is preferable that a non-stretched layer is further laminated on the surface layer side to increase the mechanical strength to prevent stretching during sticking, and the non-stretched layer is separated from other layers upon peeling and stretched. Is. In the retroreflector, a non-stretched layer is further laminated between the pattern layer and the other layer to increase mechanical strength, prevent stretching during sticking, and separate the non-stretched layer from the other layer during peeling and stretch. Is preferred.

In the retroreflector, it is preferable that the stretched layer has elasticity. In the retroreflector, it is preferable that the stretched layer has plasticity. In the retroreflector, it is preferable to use metal oxide-coated scale powder for the reflective substrate layer. In the retroreflector, it is preferable that an adhesive layer is further laminated on the reflective substrate layer side. A second subject matter of the present invention is an opening confirmation seal, a forgery prevention seal, and a designable seal using the retroreflector.

In the present invention, "stretching" means extending in a plane parallel to the layers as shown in FIG. In the present invention, the elongation means the percentage of the ratio of the elongation between the gauge points on the test piece when pulled by a force of 1 N / cm and the original gauge point distance. Further, in the present invention, elasticity is defined as a deformation rate of less than 5% when the tensile tension is removed after stretching in the tensile direction, and plasticity is defined as a deformation rate of 5% or more.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. The retroreflector of the present invention is characterized by including a reflective substrate layer, a stretching layer, and a transparent microsphere layer arranged on the surface side of the reflective substrate layer.

First, the name of light used in the present invention will be defined. As described in the above-mentioned related art, the ordinary light refers to light in a state in which the wavelengths existing under sunlight, such as light from a fluorescent lamp or the like, are different and the traveling directions of the light are also different. . On the other hand, linear light means light whose traveling directions are aligned even if the wavelengths of existing light are different.

FIG. 2 shows a schematic structure of one embodiment of the retroreflector according to the present invention (first embodiment). In the figure, the retroreflector 10 has a stretchable stretched layer 4 laminated on the reflective substrate layer 2, and a transparent microsphere layer 6 laminated on the stretched layer 4. The normal light 40 incident from the outside travels into the transparent microsphere layer 6. And at least a part thereof is reflected from the transparent microsphere layer 6 to the reflective substrate layer 2 through the stretched layer 4,
It returns to the transparent microsphere layer 6 again and proceeds outward. Since the outwardly projecting surface of the transparent microsphere layer 6 is a spherical surface, the same effect is produced even if the incident angle slightly changes, and the reflected light 50 can be returned in the incident direction.

However, even if such a state is observed with the naked eye, the incident directions of the incident light 40 are various directions, and light is scattered in each layer, so that the retroreflected light cannot be practically observed.

On the other hand, when the linear light is irradiated, the light enters the retroreflective material 10 of the present invention from only one direction, so that the reflected light also has a certain directionality (substantially the incident light entering direction). When observing such a state with the naked eye from the substantially linear light irradiation direction, since the traveling direction of the reflected light advances toward the observing naked eye, it is possible to observe the light very brightly. In this way, the retroreflective material can observe the retroreflected light only under the linear light, and cannot observe the retroreflected light under the normal light, so that it can have the secret information.

The retroreflector of the present invention can be used by adhering it to an adherend by laminating the adhesive layer 8 on the reflective substrate layer 2 side (FIG. 2 (b)).

The retroreflective body of the present invention is a seal for opening confirmation,
When used as a forgery preventive seal or the like, the stretched layer preferably has plasticity. When the stretched layer has plasticity, the retroreflector 10 stretches in the pulling direction when peeled from the adherend 30 (FIG. 1), the reflective substrate layer 2 is destroyed, and the focal length changes (FIG. 3). Even after peeling, the shape does not return to its original shape, and retroreflected light cannot be observed. Therefore, by confirming whether or not the retroreflected light can be observed, it is possible to confirm whether or not the seal is peeled off, which is useful for preventing forgery or for confirming opening. In this case, the elongation of the stretched layer is 20 to 500%.
Is preferable, and particularly 50 to 200% is optimum. 20%
When it is below, the structure that forms retroreflection is not sufficiently destroyed, and when it is 500% or more, it is difficult to handle at the time of peeling.

On the other hand, when it is used as a designable seal or the like, the stretched layer preferably has elasticity. When the stretched layer is elastic, the seal returns to its original shape even when stretched, so that the structure that forms retroreflection is not destroyed even if some movement occurs during application. Further, in this case, the elongation of the stretched layer is preferably 2 to 20%, particularly 5 to
Optimally 10%. If it is 2% or less, the effect of using the stretched layer is difficult to be exhibited, and if it is 20% or more, it becomes difficult to maintain the structure for forming retroreflection during sticking.

In the present invention, as the stretched layer, polyurethane resin, polyethylene resin, polypropylene resin,
Resin layers such as polyvinyl chloride resin, polyvinylidene chloride resin, and silicone resin can be used. Among these resins, polyurethane resin is preferable. The stretched layer may have a single structure or a multilayer structure. If necessary, a curing agent may be added to adjust the strength and elongation. The stretched layer can also be colored by adding a pigment, a dye or the like to the resin used as the stretched layer.

In the present invention, as the pressure-sensitive adhesive layer, general pressure-sensitive adhesives such as acrylic type and rubber type can be widely used. In this embodiment, the retroreflector in which the adhesive layer 8 is laminated on the reflective substrate layer 2 side has been described, but when applied to an adherend having an adhesive property, the adhesive layer 8 may not be present.

Further, when the retroreflective body of the present invention has an adhesive layer, it is preferable to laminate a release paper in order to protect the surface of the adhesive layer. In the present invention, as the release paper, one obtained by coating a base material such as paper or film with a silicone resin, wax, paraffin or the like is used. In addition, the retroreflector 10 of the present invention may have a configuration in which the stretched layer 4 with the transparent microsphere layer 6 sandwiched therebetween is laminated on the reflective substrate layer 2 (FIG. 4).

Further, it is preferable to use metal oxide-coated scale-like powder for the reflective substrate layer. The use of the metal oxide coated piece powder can impart a pearly luster to the reflected light. Further, the reflective substrate layer may be colored to color the reflected light. Giving pearly luster to the reflected light or coloring it makes it easier to confirm the reflected light.

[0024]Retroreflector with laminated pattern layers Further, the retroreflector of the present invention may be further laminated with a pattern layer.
And are preferred. The pattern in the pattern layer is visually appealing
It refers to all things that can be done, and has a specific meaning in terms of content.
It may or may not have, functionally,
For the purpose of design, appearance decoration, or communication of information
It may be the one you want. For example, such a pattern
Images such as letters, numbers, symbols, figures, patterns, and tint blocks.
You can Various forming methods such as printing are possible.
It Further, the pattern layer is preferably a hologram reproducing layer
Is.

FIG. 5 shows a schematic structure of one embodiment of a retroreflector in which a pattern layer according to the present invention is laminated (second embodiment). The second embodiment (FIG. 5) is one in which a pattern layer is laminated on the surface layer side of the first embodiment (FIG. 2). Here, the pattern layer is the hologram reproducing layer 16 including the hologram portion 12 and the reflecting portion 14. Hologram reproduction layer 16
Part of the light 60b incident from the outside of the hologram part 1 is
2 and is reflected by the reflection part 14 and reflected light 7
It becomes 0 '.

The hologram reproducing layer 16 receives the reflected light 7
The hologram image can be raised by refracting and interfering with 0'by the hologram emboss which the hologram section 12 has. That is, the hologram reproducing layer can reproduce a hologram image by causing light having a specific direction to interfere with each other by the action of refraction at the hologram embossing even under such normal light.

The incident light 60a transmitted through the hologram reproducing layer 16 is reflected by the transparent microsphere layer 6 through the stretching layer 4 on the reflective substrate layer 2, returned to the transparent microsphere layer 6 again, and hologram is reproduced again. The reflected light 70 enters the layer 16 and exits outward. Since the surface of the transparent microsphere layer 6 projecting outward is a spherical surface, the same effect is produced even if the incident angle changes slightly, and the reflected light 70 can be returned in the incident direction.

However, since the directionality of the light emitted from the light source is not determined under normal light as described above, retroreflected light is not observed. Therefore, under normal light, retroreflected light is not observed, and only the hologram image can be observed.

However, as described above, when the retroreflector is irradiated with the linear light at a higher intensity than the surrounding light, the retroreflected light can be identified only when the retroreflector is observed from the substantially linear light irradiation direction. At this time, the hologram image reproduced by the interference of light by the hologram embossing of the hologram unit 12 is
No longer observed. This is considered to be because retroreflected light strongly returns in the observation direction and cancels weak light in the hologram image reproduced by interference.

In the retroreflector having the hologram reproducing layer laminated in this way, a hologram image emerges under normal light, and when linear light is irradiated, the light due to retroreflection is emphasized more than the hologram image, and the hologram image becomes You can see the retroreflected light without seeing it.

The retroreflector of the second embodiment can also be used by adhering it to an adherend by laminating the adhesive layer 8 on the reflective substrate layer 2 side. When used as a seal for opening confirmation, a seal for forgery prevention, etc., the stretched layer preferably has plasticity. When the stretched layer has plasticity, the retroreflector 10 stretches in the pulling direction at the time of peeling from the adherend 30 (FIG. 1), the hologram reproducing layer and the reflective substrate layer are destroyed, and the focal length changes, causing peeling. After that, the shape does not return to the original shape, and the hologram image and the retroreflected light cannot be observed. Therefore, by confirming whether or not the hologram image and the retroreflected light can be observed, it is possible to confirm whether or not the retroreflector is peeled off, which is useful for preventing forgery or confirming opening. In this case, the elongation of the stretched layer is preferably 20 to 500%,
Particularly, 50 to 200% is optimum. If it is 20% or less, the structure for forming holograms and retroreflection is not sufficiently destroyed, and if it is 500% or more, handling is difficult at the time of peeling.

On the other hand, when it is used as a designable seal or the like, it is preferable that the stretched layer has elasticity. When the stretched layer has elasticity, the seal returns to its original shape even when stretched, so that the hologram and retroreflection are not destroyed even if some movement occurs during application. In this case, the elongation of the stretched layer is preferably 2 to 20%, and particularly 5 to 10%.
% Is optimal. If it is 2% or less, the effect of using the stretched layer is difficult to be exhibited, and if it is 20% or more,
It becomes difficult to maintain the structure that forms the hologram and retroreflection during application.

The design of the design drawn by the holographic image refers to all things visually appealing, and may or may not have a specific meaning in terms of content, functionally, the design, It may be for the purpose of external appearance decoration or for the purpose of information transmission. Examples of such patterns include images of letters, numbers, symbols, figures, patterns, and tint blocks.

[0034]Retroreflector laminated with non-stretched layers By increasing the mechanical strength of the entire retroreflector in the present invention,
In order to prevent the retroreflector from stretching when attached,
You can also stack a non-stretch layer on the bright retroreflector.
Wear. FIG. 6 is a retroreflector of the present invention in which non-stretched layers are laminated.
This is one embodiment (third embodiment). Re in the figure
The retroreflector is a retro-reflector holog in the second embodiment.
The non-stretched layer 18 is laminated between the lamb reproduction layer 16 and other layers.
It is characterized by being The unstretched layer may be a single structure or a multilayer structure.
It can be made.

In the retroreflector shown in the figure, it is preferable that the non-stretched layer is made of a material having high transparency in order to keep the light reflected by the retroreflection visible from the outside. The material of the non-stretched layer is not particularly limited as long as it is a highly transparent material, but is preferably selected from those having performances such as abrasion resistance, stain resistance, and solvent resistance.
It is preferable to use polyvinyl chloride, polyester, polycarbonate, acrylic resin, urethane resin or the like.

The retroreflector of the third embodiment can also be used by adhering it to an adherend by laminating the adhesive layer 8 on the reflective substrate layer 2 side. When used as a seal for opening confirmation, a seal for forgery prevention, etc., the stretched layer preferably has plasticity. Further, if the adhesive force between the adhesive layer 8 and the adherend 30 is made stronger than the adhesive force between the non-stretched layer 18 and the other layer and the non-stretched layer 18 is adjusted so as to be separated from the other layer at the time of peeling, at the time of sticking The non-stretched layer 18 is separated from other layers at the time of peeling without stretching the retroreflector, the stretched layer 4 stretches, the reflective substrate layer 2 is destroyed, and the focal length changes (FIG. 7). However, its shape does not return to its original shape, and retroreflection does not occur. Therefore, the presence or absence of peeling of the seal can be confirmed by confirming whether the retroreflected light can be observed.

Further, since the non-stretched layer 18 is separated from other layers, the hologram reproducing layer 1 laminated on the non-stretched layer 18 is separated.
The presence or absence of peeling can be confirmed without destroying 6. For that purpose, the adhesive force between the adherend and the adhesive layer is 1 to 10 N / c.
m, the adhesive force between the non-stretched layer and other layers is 0.01 to 0.5 N /
It is suitable to be cm, especially 0.04 to 0.3 N / cm. The elongation of the stretched layer is preferably 20 to 500%,
Particularly, 50 to 200% is optimum. When it is 20% or less, it is difficult to determine the destruction of the structure that forms the retroreflection.
When it is at least 00%, it is difficult to handle at the time of peeling.

FIG. 8 shows another embodiment of the retroreflector in which the non-stretched layers according to the present invention are laminated (fourth embodiment). The retroreflector in the figure is characterized in that the non-stretched layer 18 is laminated on the surface of the retroreflector in the second embodiment. Since the non-stretched layer is provided on the surface layer, the surface of the retroreflector can be protected. The non-stretched layer may have a single structure or a multilayer structure. As the material of the non-stretched layer,
Although not particularly limited, it is preferable to select from those having performance such as abrasion resistance, stain resistance, solvent resistance, etc., and use polyvinyl chloride, polyester, polycarbonate, acrylic resin, urethane resin, etc. Is preferred.

The retroreflector of the fourth embodiment can also be used by being attached to an adherend by laminating the adhesive layer 8 on the reflective substrate layer 2 side. In this case, the non-stretched layer can be used after being attached to the adherend and then removed, or can be left as it is during attachment. When the non-stretched layer is used after being removed after being attached to the retroreflector, it is preferable to weaken the adhesive force between the non-stretched layer and the stretched layer so as to facilitate peeling.
It is preferably 1 to 0.5 N / cm, and particularly preferably 0.04 to 0.3 N / cm. Further, in this case, the non-stretched layer does not necessarily have to be made of a material having high transparency.

In particular, when used as a seal for opening confirmation, a seal for preventing forgery, etc., it is preferable that the stretched layer has plasticity. By laminating the non-stretched layer, the mechanical strength of the entire retroreflector is increased, and the retroreflector is prevented from stretching when it is attached to an adherend. Further, since the non-stretched layer is removed after sticking, at the time of peeling, the stretched layer stretches, the hologram reproducing layer and the reflective substrate layer are destroyed, and the focal length changes, and even after peeling, the shape does not return to the original shape, The hologram image and retroreflected light cannot be observed. Therefore, the presence or absence of peeling can be confirmed by confirming whether or not the hologram image and the retroreflected light can be observed.

On the other hand, when it is used as a designable seal, the stretched layer preferably has elasticity. By laminating the non-stretched layer, the mechanical strength of the entire retroreflector is increased and the surface can be protected. Furthermore, since the non-stretched layer is removed after sticking, the stretchability is excellent, and the structure forming the hologram and retroreflection is not destroyed even if some movement occurs during sticking.

When the non-stretched layer is used while being left attached during application, it is preferable that the non-stretched layer is made of a material having high transparency in order to keep the color due to retroreflection visible from the outside. In particular, when used as a seal for opening confirmation, a seal for preventing forgery, etc., it is preferable that the stretched layer has plasticity. Further, it is preferable that the adhesive force between the adhesive layer and the adherend is made stronger than the adhesive force between the non-stretched layer and the other layer, and the non-stretched layer is separated from the other layer at the time of peeling. To that end, the adhesive force between the adherend and the adhesive layer is 1 to 1
0 N / cm, the adhesive force between the non-stretched layer and other layers is 0.01 to
It is preferably 0.5 N / cm, particularly 0.04 to 0.3 N / cm.

By laminating the non-stretched layer, the mechanical strength of the entire retroreflector is increased, the retroreflector is not stretched at the time of sticking, and the nonstretched layer is separated from other layers at the time of peeling,
The stretching layer stretches, the hologram reproducing layer and the reflection substrate layer are destroyed, the focal length changes, and the shape does not return to the original shape even after peeling, so that the hologram image and retroreflected light cannot be observed. Therefore, the presence or absence of peeling can be confirmed by confirming whether or not the hologram image and the retroreflected light can be observed.

Further, the shape of the retroreflector of the present invention is not particularly limited, but a shape which allows the effect of the retroreflector to be easily exhibited is appropriately selected in accordance with the shape of the container to which the retroreflector is applied. Used in shapes such as, oval, strip, and polygon.

In the retroreflector of the present invention, each layer is formed by selecting an appropriate material in consideration of adhesiveness, heat resistance, weather resistance, chemical resistance, etc. depending on the product used.
Fine paper, art paper, mirror coated paper, Japanese paper, rough surface paper, E
General printing such as steps, UV printing, UV varnish, UV coated paper,
Press coat, soft, hard, vinyl such as foamed vinyl, ABS, AS, HiPS, AC, PVC, PP, P
It can be used for various materials such as plastics such as ET, bookbinding, albums, T-shirts, various fibers such as cloth products, leather, glass, metal, and woodworking. The materials that can be used in the present invention are not limited to those listed here.

[0046]

According to the present invention, the use of the stretched layer makes it possible to obtain a retroreflector which has sufficient adhesion even to a curved surface and is useful for confirmation of opening and the like.

[Brief description of drawings]

FIG. 1 is an explanatory view of stretching a retroreflector according to the present invention at the time of peeling.

FIG. 2 is a schematic view of an embodiment of a retroreflector according to the present invention.

FIG. 3 is an explanatory diagram in which retroreflection collapses when the retroreflector according to the present invention is peeled off.

FIG. 4 is a schematic view of another embodiment of a retroreflector according to the present invention.

FIG. 5 is a schematic view of an embodiment of a retroreflector having laminated pattern layers according to the present invention.

FIG. 6 is a schematic view of an embodiment of a retroreflector in which a non-extending layer according to the present invention is laminated.

FIG. 7 is an explanatory diagram at the time of peeling a retroreflector in which a non-stretched layer according to the present invention is laminated.

FIG. 8 is a schematic view of another embodiment of a retroreflector in which a non-stretched layer according to the present invention is laminated.

FIG. 9 is an explanatory diagram of a conventional retroreflector.

[Explanation of Codes] 10 Retroreflector 2 Reflective Substrate Layer 4 Stretching Layer 6 Transparent Microsphere Layer 8 Adhesive Layer 12 Hologram Part 14 Reflecting Part 16 Hologram Reproducing Layer 18 Non-Stretching Layer 30 Adherend

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09J 7/02 C09J 7/02 Z 5C096 G03H 1/18 G03H 1/18 G09F 3/02 G09F 3/02 W 13/16 13/16 F (72) Inventor Takeshi Miyamoto 2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Shiseido Research Center Co., Ltd. (Shin-Yokohama) (72) Kenichi Sakuma Tsuzuki, Yokohama-shi, Kanagawa Prefecture 2-2-1, Hayabuchi, Ward Shiseido Research Center (Shin-Yokohama) (72) Inventor Tetsuyuki Osawa 2-2-1, Hayabuchi, Tsuzuki-ku, Yokohama, Kanagawa Shiseido Research Center (Shin-Yokohama) (72) Inventor Asahi Kimura 2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa Shiseido Research Center Co., Ltd. (Shin-Yokohama) F-term (reference) 2C005 HA02 HB10 JB08 KA48 2H042 EA07 EA15 2K008 AA13 CC00 EE04 4F100 AA17A AK04 AK07 AK15 AK16 AK51 AK52 AR00B AR00E AT00A BA03 BA04 BA05 BA07 BA10A BA10C BA10D BA10E DE02A DE04C EJ37B GB71 HB00D JK06 JK07B JK11 JK13B JK17B JL13E JL14E JN01C JN06A JN30D 4J004 AA05 AA10 AB01 CA03 CA04 CA05 CA06 CB02 CC03 CC08 CD07 DA01 DA04 DA05 DB02 EA06 FA10 5C096 AA21 BA03 CA26 CE03 CE22

Claims (15)

[Claims] 1. A retroreflector comprising a reflective substrate layer, a stretched layer that can be stretched in a direction parallel to the layer, and a transparent microsphere layer disposed on the surface side of the reflective substrate layer. 2. The retroreflector according to claim 1, wherein a stretched layer having a transparent microsphere layer sandwiched therebetween is laminated on the reflective substrate layer. 3. The retroreflector according to claim 1, wherein a stretched layer is laminated on the reflective substrate layer, and a transparent microsphere layer is laminated on the stretched layer. 4. The retroreflector according to claim 1, further comprising a pattern layer laminated on the surface side thereof. 5. The retroreflector according to claim 4, wherein the pattern layer is a hologram reproducing layer. 6. The retroreflector according to any one of claims 1 to 5, further comprising a non-stretched layer on the surface side thereof to increase mechanical strength, prevent stretching during sticking, and prevent the stretched layer after sticking. The retroreflector characterized in that the film is removed and stretched at the time of peeling. 7. The retroreflector according to any one of claims 1 to 5, further comprising a non-stretched layer on the surface side thereof to increase mechanical strength, prevent stretching during sticking, and prevent peeling during peeling. Is separated from other layers and stretched, and a retroreflector. 8. The retroreflector according to claim 4, further comprising a non-stretching layer laminated between the pattern layer and another layer to increase mechanical strength, prevent stretching during sticking, and prevent peeling during peeling. A retroreflector characterized in that the non-stretched layer is separated from other layers and stretched. 9. The retroreflector according to any one of claims 1 to 8, wherein the stretched layer has elasticity. 10. The retroreflector according to any one of claims 1 to 8, wherein the stretched layer has plasticity. 11. The retroreflector according to any one of claims 1 to 10, characterized in that a metal oxide coated scale powder is used for the reflective substrate layer. 12. The retroreflector according to any one of claims 1 to 11, further comprising an adhesive layer laminated on the reflective substrate layer side. 13. A seal for opening confirmation, which comprises the retroreflector according to any one of claims 1 to 12. 14. An anti-counterfeiting seal comprising the retroreflector according to any one of claims 1 to 12. 15. A designable seal comprising the retroreflector according to any one of claims 1 to 12.