JP3216375U - Light retroreflective sheet and article provided with light retroreflective sheet - Google Patents

Abstract

A light retroreflective sheet that can give a great surprise to a viewer and an article including the light retroreflective sheet are provided. The light retroreflective sheet 1 includes a black light retroreflective element 2 that reflects incident light L1 and returns to the light source direction, and a light transmissive property provided in the black light retroreflective element 2. Printing layer 3. When the diffused light L1 is applied, it appears black, and when a highly directional light is applied, the printed layer 3 is visible. [Selection] Figure 1

Description

  The present invention relates to a light retroreflective sheet. The present invention also relates to an article provided with a light retroreflective sheet.

  As a light retroreflective sheet, there exists a thing shown in patent document 1, for example. The light retroreflective sheet of Patent Document 1 is partially applied above or below the light retroreflective element, the transparent first colored layer applied above the light retroreflective element, and the first colored layer. And the hue, lightness, and saturation of the color of the second colored layer are the same as or substantially the same as the color of the first colored layer. The light retroreflective sheet of Patent Document 1 is configured so that the hue, lightness, and saturation of the color of the second colored layer are the same as or substantially the same as the color of the first colored layer. Although characters and the like expressed in the second colored layer cannot be visually recognized under the diffuse light condition, these characters and the like can be visually recognized under the light retroreflection condition.

JP 2000-32414 A

  However, in the light retroreflective sheet of Patent Document 1, the color of the light retroreflective element is the same as or substantially the same as the color of the first colored layer and the color of the second colored layer. It is red. As a result, the light retroreflective sheet of Patent Document 1 has the color of the light retroreflective element, the color of the first colored layer, and the color of the second colored layer under normal diffuse light conditions and light retroreflective conditions. I can see the color. As a result, the light retroreflective sheet of Patent Document 1 is different in whether the difference between the appearance under normal diffused light conditions and the appearance under the light retroreflective conditions is invisible or visible. And can not give a big surprise to the viewer.

  The problem to be solved by the present invention is to provide a light retroreflective sheet and an article provided with the light retroreflective sheet that can give a great surprise to the viewer.

  The light retroreflective sheet of the present invention is provided on the side of the black light retroreflective element that reflects the incident light and returns to the light source direction, and the side on which the light of the black light retroreflective element enters and retroreflects. A light-transmitting printed layer.

  In the light retroreflective sheet of the present invention, the black light retroreflective element is diffused light, and the reflected light of the diffused light reflected by the black light retroreflective element is black. And it is preferable that the reflected light of the light with strong directivity reflected by the black light retroreflective element is white.

  An article provided with the light retroreflective sheet according to the present invention includes an article and the light retroreflective sheet provided on the article (the light retroreflective sheet according to claim 1 or 2 of the utility model registration claim). ).

  The present invention can provide an optical retroreflective sheet and an article including the optical retroreflective sheet that can give a great surprise to a viewer.

FIG. 1 shows an embodiment of an article provided with a light retroreflective sheet and a light retroreflective sheet according to the present invention, and is a partially enlarged cross-sectional explanatory view of an observation state under normal diffused light conditions. FIG. 2 is a partially enlarged cross-sectional explanatory view showing an observation state under a light retroreflection condition. FIG. 3 is an explanatory front view showing a state under normal diffused light conditions. FIG. 4 is an explanatory front view showing a state under a light retroreflection condition. FIG. 5 is an explanatory front view schematically showing a state under normal diffused light conditions. FIG. 6 is a front explanatory view schematically showing a state under a light retroreflection condition.

  Hereinafter, one example of an embodiment (example) of an article provided with a light retroreflective sheet and a light retroreflective sheet according to the present invention will be described in detail based on the drawings. 5 and 6 are schematic diagrams depicting the outlines of the print layer 3 and the fan 100 so that the degree of visibility of the print layer 3 can be easily understood. For this reason, in FIGS. 5 and 6, the illustration of the motif (see FIG. 4) with motifs of mari and cherry blossoms drawn on the design portion 31 of the printed layer 3 is omitted.

  In this specification and the claim for utility model registration in the attached sheet, “light retroreflective” refers to reflection in which reflected light selectively returns in a direction substantially along the optical path of the incident angle over a wide irradiation angle. Say. “Black” and “white” are achromatic, that is, the saturation is zero.

(Description of Configuration of Embodiment)
Hereinafter, the structure of the article provided with the light retroreflective sheet and the light retroreflective sheet according to this embodiment will be described. In the figure, reference numeral 1 denotes a light retroreflective sheet according to this embodiment. In the figure, reference numeral 100 denotes an article provided with the light retroreflective sheet 1 according to this embodiment.

(Description of the light retroreflective sheet 1)
As shown in FIGS. 1 and 2, the light retroreflective sheet 1 includes a black light retroreflective element 2, a light transmissive printed layer 3, a clear layer (protective layer, surface layer) 4, and an adhesive. An agent layer (adhesive layer) 5 and a substrate (release liner, separator) 6 are provided.

(Description of black light retroreflective element 2)
The black light retroreflective element (hereinafter referred to as “light retroreflective element”) 2 is an encapsulated lens type light retroreflective element in this example, and “3M (registered trademark) Scotchcal (registered trademark)”. Reflective sheet 680 series 680-85 black "is used. In this light retroreflective element 2, the reflected light L12 (see FIG. 1) of the diffused light L1 is black, and the reflected light L20 (see FIG. 2) of the light L2 having strong directivity is white. The black light retroreflective element 2 may be an example other than the above examples. For example, “Nippon Carbide Industries Co., Ltd. Nikkalite Retroreflective Sheet Type Encapsulated Lens Type Retroreflective Sheet Grade 6200 Series (Pressure Sensitive Type) Black”.

  As shown in FIGS. 1 and 2, the light retroreflective element 2 includes a large number of light-transmitting spheres (glass beads) 20, an adhesive layer (binder layer, transparent plastic film) 21, and a focus resin. It has a layer (focal layer, glue) 22 and a reflective layer (reflective surface) 23.

  In this example, the sphere 20 is a glass sphere having a high refractive index and a diameter of about 35 to 120 mm. The adhesive layer 21 and the focus resin layer 22 enclose a large number of spheres 20 in a planar shape from both sides (upper and lower sides). The film thickness (thickness) of the adhesive layer 21 and the film thickness of the focus resin layer 22 have a film thickness sufficient to enclose a large number of spheres 20 in a planar shape. The adhesive layer 21 and the focus resin layer 22 are made of a light transmissive material. The adhesive layer 21 is black. Thereby, the light retroreflective element 2 becomes black. When the adhesive layer 21 is colorless and transparent, a light-transmitting black print layer is provided on one surface of the adhesive layer 21 (the surface opposite to the sphere 20 side).

  The reflective layer 23 is formed on the focus resin layer 22 side. That is, the reflective layer 23 is formed on the surface of the focal resin layer 22 opposite to the sphere 20. The reflective layer 23 is formed from a part of a spherical surface that is concentric or substantially concentric with the center of the sphere 20. The reflective layer 23 is made of a metal layer such as aluminum.

  Here, the light retroreflection in the light retroreflective element 2 is demonstrated with reference to FIG. 1, FIG. Lights L1 and L2 from a light source (not shown) are transmitted through the adhesive layer 21 and the sphere 20 and are refracted at the surface (interface) of the sphere 20 when passing through the sphere 20 to be reflected by the reflective layer 23. It converges (gathers) at an upper focal point (not shown). The light that has converged on the focal point is reflected by the reflective layer 23 and passes through the spherical body 20 and the adhesive layer 21 again as reflected light L10 and L20, and when passing through the spherical body 20, the surface (interface) of the spherical body 20 Is refracted and returns to the light source direction in parallel or substantially parallel to the incident light.

(Description of the light-transmissive printing layer 3)
The light-transmissive printing layer (hereinafter referred to as “printing layer”) 3 is a resin-based transparent ink (light-transmissive ink) printed using a conventional printing method such as a screen printing method or a gravure printing method. Has been. In particular, it is preferable to form the printing layer 3 by screen printing. The film thickness of the printing layer 3 is about 2 to 20 μm in this example. In addition, the film thickness of the printing layer 3 can be widely changed according to a desired effect and its formation method, and may be a film thickness other than about 2 to 20 μm.

  As shown in FIGS. 1 and 2, the print layer 3 is provided on the light retroreflective element 2 on the side where light is incident and retroreflected, that is, on the adhesive layer 21 side of the light retroreflective element 2. (Stacked). As shown in FIG. 4, the print layer 3 has a design portion 31. The design portion 31 is colored with an arbitrary color (color). In the design portion 31, in this example, a design with a motif of mariya cherry blossom petals is drawn. The design portion 31 may be drawn with a design other than a design with a motif of Mariya or cherry blossom petals, or may be drawn with letters, numbers, diagrams, or the like in addition to the design. In addition, the printing layer 3 may be provided in the whole with respect to the optical retroreflection element 2, and may be provided partially.

(Description of clear layer 4, pressure-sensitive adhesive layer 5 and substrate 6)
The clear layer 4 is provided (stacked) on the printed layer 3 side of the light retroreflective element 2. The clear layer 4 acts as a protective film that protects the light retroreflective element 2 and the print layer 3. Therefore, it is desirable that the clear layer 4 has weather resistance and heat resistance in addition to transparency, which is an essential property, and is preferably an appropriate resin among various resins that satisfy such properties. Can be selected and formed. It is also desirable that the clear layer 4 has good adhesion to the printing layer 3 that is the base. The resin for forming the clear layer 4 is not limited to those listed below, but examples thereof include polyester resin, polyethylene resin, urethane resin, vinyl chloride resin, acrylic resin, and vinylidene fluoride resin.

  Moreover, although the film thickness of the clear layer 4 can be widely changed depending on a desired effect, it is usually preferably in the range of about 5 to 100 μm, more preferably in the range of about 20 to 75 μm. . That is, the film thickness of the clear layer 4 is not particularly limited as long as it does not impair the flexibility of the entire sheet. Further, as an additional effect of the clear layer 4, it can be expected that the sheet surface is given gloss.

  The substrate 6 is provided (stacked) on the opposite side of the light retroreflective element 2 with respect to the print layer 3, that is, on the focal resin layer 22 side, with the adhesive layer 5 interposed therebetween. The base material 6 supports the light retroreflective sheet 1 and facilitates handling and sticking thereof. As the substrate 6, a release liner can be advantageously used. The pressure-sensitive adhesive layer 5 with a release liner is commercially available. By using such a pressure-sensitive adhesive layer 5 with a base material 6 (release liner) in combination with the light retroreflective sheet 1, general users can easily attach it to any article. In addition, the clear layer 4, the adhesive layer 5, and the base material 6 do not need to provide.

(Description of article 100)
The article 100 is a fan in this example. An article 100 (hereinafter referred to as a “round fan”) that is a fan has a fan part 101 and a handle 102 as shown in FIGS. 3 to 6. The fan 100 is made of a black resin in this example. The color of the fan 100 may be a color other than black, and the material of the fan 100 may be a material other than resin.

  The light retroreflective sheet 1 is provided on one surface (or both surfaces) of the fan unit 101 of the fan 100. That is, the base material 6 of the light retroreflective sheet 1 is peeled from the pressure-sensitive adhesive layer 5, and the pressure-sensitive adhesive layer 5 of the light retroreflective sheet 1 is attached to one surface (or both surfaces) of the fan 101 of the fan 100. Here, in FIG. 1, FIG. 2, the fan 100 and the base material 6 are shown by the same thing. That is, in the case of the light retroreflective sheet 1, it is the base material 6, and when the light retroreflective sheet 1 is attached to the fan 100, it is the fan 100. 1 and 2, in the case of the fan 100, the thickness of the fan 100 is larger than the thickness of the base material 6.

(Description of the operation of the embodiment)
The light retroreflective sheet 1 and the fan 100 according to this embodiment are configured as described above. Here, “under normal diffused light conditions” refers to a state where diffused light L1 such as natural light or illumination light hits the light retroreflective sheet 1 and the fan 100. In addition, “light retroreflective conditions” means that light L2 having strong directivity such as light emitted from a headlight of a vehicle or flash light from a light emitting element mounted on a portable electronic device (smartphone, tablet, etc.) This refers to a state in which the light retroreflective sheet 1 and the fan 100 are irradiated. In addition, the observation state of the light retroreflective sheet 1 and the fan 100 may be day or night or indoor or outdoor.

(Explanation under normal diffused light conditions)
First, the operation under normal diffused light conditions will be described with reference to FIGS. 1, 3, and 5. FIG. In FIG. 3, in order to clarify the lead lines denoted by reference numerals “101” and “102”, the black background portion (black portion) around the lead line is illustrated with white portions (white portion, ground color portion of the drawing). . However, the real thing looks black (black).

  Diffused light L1 such as natural light or illumination light hits the light retroreflective sheet 1 and the fan 100. Then, the diffused light L1 passes through the clear layer 4 and reaches the print layer 3 as shown in FIG. A part of the diffused light L1 is reflected by the printing layer 3 to be reflected as light L11 and transmitted through the clear layer 4 to be emitted to the outside. The reflected light L11 has a color of the design portion 31 of the printed layer 3. Part of this reflected light L11 enters the human eye 7.

  The remainder of the diffused light L1 (the remainder of the diffused light L1 that has not been reflected by the printing layer 3) passes through the printing layer 3 and reaches the adhesive layer 21 of the light retroreflective element 2. The remaining part of the diffused light L1 is reflected by the adhesive layer 21 and passes through the printing layer 3 and the clear layer 4 as the reflected light L12 and is emitted to the outside. The reflected light L <b> 12 is the black color of the adhesive layer 21. Part of this reflected light L12 enters the human eye 7.

  The remainder of the diffused light L1 (the remainder of the diffused light L1 that has not been reflected by the printing layer 3 and the adhesive layer 21) is retroreflected by the light retroreflective element 2, and is reflected as the reflected light L10. 4 is transmitted to the outside. The reflected light L10 is white, but the amount of light is small (low) and the light is weak (dark). For this reason, even if a part of the reflected light L10 enters the human eye 7, it is difficult for the human eye 7 to visually recognize the white reflected light L10 with a small amount of light. The optical path of the diffused light L1 on the incident side and the optical path of the retroreflected reflected light L10 on the outgoing side are parallel or substantially parallel.

  Under this normal diffused light condition, the light retroreflective sheet 1 and the fan 100 appear black as shown in FIG. Depending on the viewing direction of the light retroreflective sheet 1 and the fan 100, the design portion 31 of the printed layer 3 may be slightly visible on a black background (see the broken line in FIG. 5).

(Explanation under light retroreflective conditions)
Next, the operation under the light retroreflection condition will be described with reference to FIGS. In FIG. 4, in order to clarify the lead lines with reference numerals “3”, “31”, “101”, and “102”, the black background part (black part) around the lead line is outlined (white part, ground part of the drawing). (Color part). However, the real thing looks black (black).

  The light retroreflective sheet 1 and the fan 100 are irradiated with light L2 having high directivity. Then, the light L2 having high directivity is transmitted through the clear layer 4 and the printing layer 3 and retroreflected by the light retroreflective element 2 as shown in FIG. The light passes through the layer 4 and is emitted to the outside. The optical path of the light L2 having a strong directivity on the incident side and the optical path of the reflected light L20 on the outgoing side are parallel or substantially parallel.

  Here, the reflected light L20 retroreflected by the light retroreflective element 2 is white. Moreover, the amount of the reflected light L20 of the light L2 having a strong directivity is larger (higher) and stronger (brighter) than the amount of the reflected light L10 of the diffused light L1. For this reason, the white reflected light L20 having a large amount of light passes through the printing layer 3 and the clear layer 4 and is emitted to the outside, so that the design portion 31 of the printing layer 3 has a black background as shown in FIG. The reflective sheet 1 and the fan 100 appear to float partially. That is, the reflected light L20 retroreflected from the light retroreflective element 2 functions as a so-called “backlight”, and is a design portion 31 of the printed layer 3 that is difficult or invisible under normal diffused light conditions. To make it visible.

  In particular, as shown in FIG. 2, the amount of reflected light L20 is further increased by irradiating light retroreflective sheet 1 and fan 100 vertically or substantially vertically with light L2 having high directivity. Further, by positioning the human eye 7 near the light source of the light L2 having high directivity, the amount of the reflected light L20 entering the human eye 7 is further increased. Thereby, the design portion 31 of the printed layer 3 can be seen more clearly in the black light retroreflective sheet 1 and the fan 100.

  Even if the light retroreflective sheet 1 and the fan 100 are irradiated obliquely with the light L2 having a strong directivity, the design portion 31 of the printing layer 3 is a black background in substantially the same manner as when irradiated vertically or substantially vertically. It looks like the light retroreflective sheet 1 and the fan 100. Further, the design portion 31 of the printing layer 3 may be visible over the entire light retroreflective sheet 1 and the fan 100. Further, depending on the viewing direction of the light retroreflective sheet 1 and the fan 100, the design portion 31 of the printed layer 3 that was slightly visible under normal diffused light conditions (see the broken line in FIG. 5) is a solid line in FIG. As you can see, it may become clearly visible.

(Explanation of effect of embodiment)
The light retroreflective sheet 1 according to this embodiment and the article 100 that is a fan are configured and operated as described above, and the effects thereof will be described below.

  Since the light retroreflective sheet 1 and the article 100 according to this embodiment are provided with the light-transmissive printing layer 3 on the black light retroreflective element 2, the normal diffusion that the diffused light L1 strikes is provided. On the other hand, the design portion 31 of the printed layer 3 can be seen under the light retroreflective condition where the light L2 having a high directivity hits. As described above, the retroreflective sheet 1 and the article 100 according to this embodiment can see the design portion 31 of the printed layer 3 that is not visible under normal diffused light conditions by applying the light L2 having high directivity.

  As a result, the light retroreflective sheet 1 and the article 100 according to this embodiment can be seen as black under normal diffused light conditions and the design portion 31 of the printed layer 3 under the light retroreflective conditions. Is larger than the light retroreflective sheet of Patent Document 1 described above. Thereby, the light retroreflective sheet 1 and the article 100 according to this embodiment can give a great surprise (impact) to the viewer.

  In particular, the design portion 31 of the printed layer 3 can be seen more clearly under the light retroreflecting condition of the light L2, which is flash light from a light emitting element mounted on a portable electronic device and has a very strong directivity. In addition, in the portable electronic device, a light emitting element as a light source and an image pickup element (an image element, an image sensor, an image sensor) corresponding to the human eye 7 are arranged close to each other. , The design portion 31 of the printed layer 3 can be seen more clearly.

  The light retroreflective sheet 1 and the article 100 according to this embodiment can be changed from the black background to the design portion 31 of the printed layer 3 at any time and anywhere as long as there is a device or equipment that emits light L2 having strong directivity. Can see. Currently, portable electronic devices possessed by most people are equipped with a light emitting element that emits light L2 having particularly high directivity. As a result, the retroreflective sheet 1 and the article 100 according to this embodiment can be enjoyed by changing most people from the black background to the design portion 31 of the printed layer 3 at any time and anywhere.

  In the light retroreflective sheet 1 and the article 100 according to this embodiment, as the black light retroreflective element 2, the reflected light L12 which is the diffused light L1 and reflected by the light retroreflective element 2 is black, and The black light retroreflective element 2 is used, which is the light L2 having strong directivity and the reflected light L10 reflected by the light retroreflective element 2 is white. As a result, the light retroreflective sheet 1 and the article 100 according to this embodiment can be seen as black under normal diffused light conditions and the design portion 31 of the printed layer 3 under the light retroreflective conditions. The difference between and can be further reliably increased. Thereby, the optical retroreflection sheet 1 and the article 100 according to this embodiment can more surely give a great surprise (impact) to the viewer.

(Description of example other than embodiment)
In the above embodiment, an encapsulated lens type light retroreflective element is used as the light retroreflective element 2. However, in the present invention, for example, a capsule lens type light retroreflective element or a prism type light retroreflective element may be used as the light retroreflective element 2 in addition to the encapsulated lens type light retroreflective element. .

  Moreover, in the said embodiment, the light retroreflective sheet 1 and the fan 100 are each manufactured separately, and the light retroreflective sheet 1 is affixed on the fan 100. FIG. However, in the present invention, the light retroreflective sheet 1 may be directly provided on the fan 100 or other articles.

  Furthermore, in the said embodiment, the fan 100 is used as an article | item. However, in the present invention, an article other than the fan 100 may be used as the article. For example, a plate is used as an article, and the light retroreflective sheet 1 is attached to the plate and used as a decoration or a poster.

  In addition, this invention is not limited by the said embodiment. That is, the light retroreflective sheet of the present invention may be any one provided with the black light retroreflective element 2 and the light transmissive printed layer 3, and includes the clear layer 4, the pressure-sensitive adhesive layer 5, and the base material. 6 may not be provided.

1 light retroreflective sheet 100 article (round fan)
2 Black light retroreflective elements (light retroreflective elements)
20 Sphere 21 Adhesive Layer 22 Focus Resin Layer 23 Reflective Layer 3 Light-Transparent Print Layer (Print Layer)
31 Design part 4 Clear layer 5 Adhesive layer 6 Base material 7 Eye L1 Diffused light L10 Reflected light (reflected light that is diffused light and retroreflected by a light retroreflective element)
L11 Reflected light (diffuse light reflected from the printing layer)
L12 reflected light (diffused light reflected by the adhesive layer of the light retroreflective element)
L2 Light with strong directivity L20 Reflected light (reflected light with strong directivity and retroreflected by the light retroreflective element)

Claims (3)

A black light retroreflective element that reflects incident light and returns to the light source direction;
A light-transmitting printed layer provided on the side of the black light retroreflective element on which light is incident and retroreflected;
An optical retroreflective sheet comprising: The black light retroreflective element is
Diffuse light, the reflected light of the diffused light reflected by the black light retroreflective element is black,
The reflected light of the light having strong directivity and reflected by the black light retroreflective element is white.
The light retroreflective sheet according to claim 1, wherein: Goods,
The light retroreflective sheet according to claim 1 or 2 provided in the article,
Comprising
An article comprising a light retroreflective sheet characterized by the above.

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