HK1019171B - A colored light retroreflective material and a retroreflective hologram reconstructor using the same - Google Patents

Description

Colored light reproducing and reflecting member and reproduced reflection hologram reproduction body using the same

The present invention relates to a retroreflective member, and more particularly, to a colored light retroreflective member that colors return light, and to improvements in the appearance, decorativeness, and forgery prevention of a hologram reproduction body formed by using the retroreflective member.

When a retroreflective member is used for a traffic sign for night recognition, clothing, or the like, for example, and beam-shaped light such as a headlight of a motor vehicle is irradiated to the retroreflective member, even when the light beam enters the retroreflective member at a certain angle, the return light can be transmitted substantially in the incident direction.

Therefore, in the so-called specular reflection, since reflected light is generated so that the incident angle is substantially the same as the reflection angle, the reflected light does not return in the incident direction except when the light enters in the direction perpendicular to the mirror surface.

Thus, in the manner described in the documents such as JP 63-38902 a and JP 8-60627 a, small microspheres having a relatively high refractive index and a particle diameter of substantially 30 to 80 μm are provided on a light reflecting layer such as a metal film, so that even when light is incident at a certain angle, the light is returned substantially in the incident direction, and a so-called retroreflective member is widely used.

The above-described retroreflective member has an advantage that even for light incident at a certain incident angle, the rate of return thereof in the incident direction is high, but for a specular reflector, the point that light of the same hue as that of the incident light returns does not change.

In order to color the retroreflective member, a method of coloring a portion through which light passes with a pigment or dye having high transparency has been used in the past.

For example, a method of coloring an aluminum deposited film on the bottom of a glass microsphere or a method of coloring a glass microsphere itself is used, and isoindoline, copper chloride phthalocyanine, anthraquinone, thioindigo, or the like can be used as a coloring agent. Further, according to the method described in JP Kokoku publication Sho-58-55024, mica having a high reflectance is used as a reflective layer, and a transparent coloring agent is mixed therewith.

However, since the conventional coloring mechanism of the colorant absorbs light of a specific wavelength from incident light and develops the color with the remaining color, it is inevitable that the light utilization efficiency is low and the brightness or the sharpness is lowered. In addition, since it is necessary to use a colorant having high transparency in order to keep the light use efficiency high after coloring, there are also problems that only a very limited amount of colorant can be used, and the light and even heat stability of these colorants is deteriorated, and the use method is limited, and further, since only a limited amount of colorant can be used, there is a case that it is difficult to make the reproduction reflection member have good appearance.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a reproduction reflecting member which has high light utilization efficiency and can provide reflected light with various color tones. Another object of the present invention is to provide a hologram reproduction body which can reflect light in substantially the same direction as the incident direction when the linear light having a certain directivity is projected by using the above-mentioned reproduction reflecting member for the hologram reproduction body, and has an appearance, a decorative property and a high forgery prevention property.

In order to achieve the above object, a reproduction reflecting member according to the present invention is characterized in that a part of incident light is made to have a phase difference, the light components in a specific wavelength region are synthesized again, and a colored light having a color different from that of the incident light is returned in the incident light entering direction.

Therefore, the present inventors have employed interference of light to color the reflected light of the reproduction reflecting member. In addition, when the retroreflective member is used, unlike general specular reflection, light is refracted by the retroreflective member a plurality of times. The return light can be made to have an interference color by a substance that generates colored interference light in the optical path.

In the reflective member of the present invention, it is preferable that the reflective member includes a reflective main plate and transparent microspheres arranged in a row on the main plate, and an interference material layer for generating a colored interference color is provided on the reflective main plate.

In the reflecting member of the present invention, it is preferable that the reflecting member includes a main plate and transparent microspheres arranged in a row on the main plate, and an interference substance layer is provided on a surface of the transparent microspheres facing the main plate.

In the reflecting member of the present invention, preferably, the interference material layer is made of a scale-like powder coated with an oxidized metal.

In the reflecting member of the present invention, the metal oxide-coated scale-like powder is preferably coated titanium dioxide mica and/or coated titanium suboxide mica having a titanium oxide layer of 40nm or more in thickness.

In the reflecting member of the present invention, the reflecting plate preferably has a color tone different from the interference color of the titanium oxide coated mica.

In the reflecting member of the present invention, it is preferable that the scale-like powder coated with an oxidized metal is titanium oxide coated mica having an external color different from the interference color.

In the reflecting member of the present invention, it is preferable that the interference material layer is a surface oxide metal thin film.

Further, it is apparent from the analysis by the present inventors that interesting characteristics can be exhibited by combining the above-described retroreflective member with a hologram reproduction body.

That is, the hologram reproduction body is irradiated with coherent light to a certain object, and reflected waves generated from the object are recorded on the photosensitive recording medium. The reflected wave generated by the object is called an object wave. When an object wave is recorded on a photosensitive recording medium, a mirror or the like is placed close to the object, and a part of the light directed to the object is directly transmitted to the photosensitive recording medium without passing through the object. This light is called the reference wave. Then, an interference pattern formed by overlapping the object wave and the reference wave is recorded on the photosensitive recording medium. The interference pattern includes all information of both the amplitude and the phase of the object wave, although the photosensitive recording medium responds only to the light intensity.

The interference pattern is completely different from the original object and becomes an irregular pattern of fine fringes. However, if light is transmitted through the film on which the interference pattern is recorded, it reproduces a three-dimensional image of the original object.

The hologram film is composed of a hologram layer formed of a transparent synthetic resin film having hologram embossing formed by using a concavo-convex portion for expressing a hologram by a light interference system, and a reflection layer formed by vapor-depositing a light-reflective metal or a metal oxide having a high refractive index. Since the hologram layer formed of the synthetic resin film having the hologram embossing and the reflection layer formed of the metal vapor deposition film are stacked, when light is irradiated from the hologram layer side, incident light transmitted through the transparent resin is reflected by the reflection layer, and the hologram image is raised by the action of the embossed concave and convex portions in the hologram layer.

Since the hologram film having a light reflective metal in a reflective layer has rich gloss, presents a beautiful appearance, and is noticeable, it can be used in a large number of packages, brochures, books, and the like.

In particular, since the production and preparation costs of the hologram reproduction are high, the production requires a high technique, and it is difficult to copy and counterfeit the hologram reproduction, and thus the hologram reproduction can be used for certificates such as credit cards, securities, and certificates.

Further, products such as a semi-transparent hologram film in which a reflective layer is formed in a semi-vapor deposition state of 10 to 20% vapor deposition with respect to a state in which a light reflective metal is completely vapor deposited in 100%, and a transparent hologram film in which a reflective layer is formed by vapor deposition of a metal oxide having a high refractive index have recently come into the market.

However, in general, aluminum is used as a light reflective metal for the reflective layer in the hologram, so that the entire color substantially appears silver. In addition, even in a transparent or translucent hologram film, the appearance and decorativeness are poor due to monotonous color.

In addition, although a technique for imparting a color to a hologram film is disclosed in japanese patent laid-open No. 62-133476 or the like, since the technique disclosed herein employs a general ink-printed pattern on the surface layer of the hologram layer, the hologram may be in a visible state or an invisible state regardless of the state, but is often visually captured. Therefore, if a technique for producing a hologram is provided, since it is not difficult to provide a pattern, the pattern can be drawn with a material which is easy to handle, and thus the forgery prevention effect cannot be sufficiently exhibited.

In addition, it is currently the case that copying and manufacturing of an existing hologram reproduction are not difficult due to the recent improvement in the technical level and the progress of computer processing technology. Thus, it is not as valuable as when the hologram was originally used for the purpose of forgery prevention.

The present inventors have also found that by stacking the retroreflective member of the present invention on a hologram reproduction body, the appearance, decorativeness, and high forgery prevention properties that conventional hologram reproduction bodies do not have can be obtained.

Accordingly, the hologram reproduction body of the present invention is characterized in that a hologram reproduction body is stacked, and the hologram reproduction body is stacked with the above-described reproduction reflection member, hologram layer, and reflection layer, thereby reproducing a three-dimensional image.

In the retroreflective hologram regenerator of the present invention, it is preferable that a hologram regenerator for regenerating a three-dimensional image is stacked by stacking a retroreflective member of the present invention, a hologram layer, and a reflective layer, the retroreflective member being composed of an interference material layer for generating a colored interference color, and transparent microspheres arranged in a row on the interference material layer.

In the reconstructed reflection hologram reconstruction body according to the present invention, it is preferable that the position where the interference substance is provided is manipulated so as to draw a character or a figure corresponding to a difference in interference color of incident light.

In the reproduced reflection hologram reproduction medium according to the present invention, it is preferable that the characters or figures drawn by the interference substance are different from the hologram image reproduced by the hologram layer.

FIG. 1 is an explanatory view of a schematic structure of a colored light-reproducing reflecting member according to an embodiment of the present invention;

FIG. 2 is an explanatory view of the main structure of a colored light reproducing reflecting member according to embodiment 1-1, 1-2, 2-1 and 2-2 of the present invention;

FIG. 3 is an explanatory view of the main structure of a colored light reproduction reflecting member according to embodiments 1 to 3 and 2 to 3 of the present invention;

FIG. 4 is an explanatory view of the main structure of a colored light reproduction reflecting member according to embodiments 1 to 4 and 2 to 4 of the present invention;

FIG. 5 is an explanatory view of the main structure of a colored light reproduction reflecting member according to embodiments 1 to 5 and 2 to 5 of the present invention;

FIG. 6 is an explanatory view of the main structure of a colored light reproduction reflecting member according to embodiments 1 to 6 and 2 to 6 of the present invention;

FIG. 7 is a schematic view of a general hologram reproduction body;

FIG. 8 is an explanatory view of a schematic configuration of one embodiment of a reproduced reflection hologram reproduction body of the present invention;

FIG. 9 is a view of a reproduced reflection hologram of the present invention viewed under normal light;

fig. 10 is a view of the reproduced reflection hologram reproduction body of the present invention viewed in the light source direction under straight light.

Preferred embodiments of the retroreflective member and the hologram reproduction body using the retroreflective member according to the present invention will be described in detail below.

Reproduction reflection member

1 st to 1 st embodiment

Fig. 1 shows a schematic structure of a retroreflective member according to an embodiment of the present invention.

In the figure, in the retroreflective member 10, a resin layer 14 is provided on a retroreflective main plate 12, and a plurality of transparent microspheres 16 are provided in a row on the surface layer side of the resin layer, and the microspheres 16 are made of glass or the like and have a particle diameter in the range of 30 to 80 μm.

In addition, incident light 18 entering from the outside travels inside the small microsphere 16. At least a part of the incident light 18 passes through the transparent microspheres 16, is reflected by the resin layer 14 toward the reflective main plate 12, returns to the microspheres 16 again, and travels outward. Since the outwardly projecting surface of the small microsphere 16 is a spherical surface, the same effect is produced even when the incident angle is changed to some extent, and the reflected light 20 can be returned in the incident direction.

The present invention is characterized in that the reflected light 20 is colored by means of light interference, and therefore, according to the present embodiment, an interference material layer 22 is provided on the reflection main plate 12.

As a result, the incident light 18 interferes with the interference material layer 22, and the reflected light 20 has a color tone of a wavelength emphasized by the interference action.

That is, as shown in fig. 2, in the present embodiment, the interference material layer 22 is formed of mica coated with titanium dioxide, and the mica 22 coated with titanium dioxide is composed of scaly mica 24 and a titanium dioxide layer 26 coated on the mica 24. In addition, a part 20a of the incident light 18 is reflected by the surface of the titanium dioxide layer 26, and another part 20b is reflected by the interface between the mica 24 and the titanium dioxide layer 26. The reflected light 20a and the reflected light 20b have an optical path difference of about twice that of the titanium dioxide layer 26, and of the wavelength components of the reflected light 20a and the reflected light 20b, a component whose optical path difference is an odd multiple of a half wavelength is amplified and a component whose optical path difference is an integral multiple of the wavelength is attenuated. As a result, by adjusting the layer thickness of the titanium dioxide layer 26, the reflected interference light 28 having a desired color tone can be obtained. In addition, as shown in FIG. 1 above, the colored reflected interference light 28 returns through the transparent microspheres 16 in substantially the same direction as the optical path of the incident light.

In the present embodiment, if the reflectance of the titanium dioxide coated mica 22 is increased, the colored reflected interference light 28 is clearly observed from the return direction.

If the colored light reproduction reflecting member 10 of the present embodiment is used as described above, since the interference of light is utilized to provide a color tone to the returning light, the light utilization efficiency is extremely high, and further, by adjusting the layer thickness of titanium dioxide, an arbitrary color tone can be obtained. Further, since the interference color is generated by an inorganic substance which is chemically and optically stable, i.e., mica coated with a titanium dioxide layer, a colored light-reproducing reflective member excellent in heat resistance and weathering resistance can be formed.

Further, in the case of mica coated with a titanium dioxide layer, the following relationship was observed with respect to the thickness of the titanium dioxide layer and the interference color.

TABLE 1

Interference color	Geometric thickness (nm) of titanium dioxide
		Silver (Ag)	20～40
Gold (Au)	40～90
		Red wine	90～110
Purple pigment	110～120
		Blue (B)	120～135
Green	135～155
		Grade 2 gold	155～175
Class 2 violet	175～200

Therefore, it is preferable that the geometric layer thickness of the titanium dioxide-overcoated mica used in the present embodiment is 40nm or more.

1 st and 2 nd embodiments

In fig. 2, if the light transmittance of the mica 22 coated with titanium dioxide is adjusted to increase the reflection ratio of the reflection main plate 12, the reflection light 30 of the reflection main plate 12 can be observed. Therefore, since the reflection master 12 is colored, the color tone of the return light 20 is synthesized by the colored reflected interference light 28 and the reflected light 30 representing the master color. In this case, the colored reflected interference light 28 is not observed substantially in the direction other than the return incident direction, and the color tone of the reflection main plate 22 is observed, and if a light beam such as a headlamp in an automobile is incident, the light observed in the light source direction and the light observed in the other direction can be observed in different color tones.

Embodiments 1 to 3

Fig. 3 shows a colored light retroreflective member according to embodiments 1 to 3 of the present invention, and the portions corresponding to the above-mentioned embodiments 1 to 1 are denoted by numerals with 100 added thereto, and the description thereof is omitted.

The interference material 122 of this embodiment is mica coated with a color titanium-based composite oxide.

In this case, as in the above-described embodiment 1-2, the return light 128 is observed by the color tone of the composite oxide 126 synthesized with an interference color formed by an optical path difference based on the composite oxide layer, and the color tone observed from a direction other than the light source direction is the original color tone of the mica 126 overcoated with the composite oxide.

Embodiments 1 to 4

Fig. 4 shows the main parts of the colored light recycling reflective member according to embodiments 1 to 4 of the present invention, and the parts corresponding to fig. 2 are indicated by numerals with 200 added thereto, and the description thereof is omitted.

In the colored light retroreflective member 210 shown in the figure, the interference substance 222 adheres to the buried surface of the resin layer 214 of the transparent microspheres 216. As the interfering substance to be adhered, general interference, mica coated with titanium dioxide, or colored mica coated with a composite oxide can be used as described above.

In this case, whether to return after repeated reflection in the small microspheres 216 and the interference substance layer 222 or to return after reflection by the reflection master plate 212 is determined by a factor such as a difference in refractive index between the transparent small microspheres 216 and the interference substance 222. Also where light passes through the interference substance layer 222, and is reflected by the reflective main plate 212, colored return light can be obtained due to the generation of so-called transmitted interference light when the light passes through the interference substance.

Embodiments 1 to 5

Fig. 5 shows the main parts of the colored light recycling reflective member according to embodiments 1 to 5 of the present invention, and the parts corresponding to fig. 2 are indicated by numerals with 300 added thereto, and the description thereof is omitted.

In the reproduction reflecting member 310 shown in the figure, an interference substance layer 322 is directly provided on the reflection master plate 312. In addition, a specific color tone can be obtained by interference between the reflected light 320a reflected by the surface of the interference substance layer 322 and the reflected light 320b reflected on the reflection main plate 312.

Embodiments 1 to 6

Fig. 6 shows the main parts of the colored light recycling reflective member according to embodiments 1 to 6 of the present invention, and the parts corresponding to fig. 2 are indicated by numerals with 400 added thereto, and the description thereof is omitted.

In the retroreflective member 410 shown in the figure, an interference material layer 422 is formed on the buried surface of the resin layer 414 of the transparent microspheres 416. In this case, a reflection layer 440 is provided in the interference substance layer 422 closer to the outer edge, and a specific color tone can be obtained by interference between the reflected light 420a generated by the interface between the transparent microspheres 416 and the interference substance layer 422 and the reflected light 420b generated by the reflection layer 440.

Further, as the interference substance used in the above embodiments 1-1 to 1-4, it is preferable to use an interference scale-like powder represented by the above mica coated with titanium dioxide.

Examples of the scale-like powder constituting the main component of the interference scale-like powder include powders of metallic aluminum, metallic titanium, stainless steel, or the like, inorganic plate-like oxides such as plate-like iron oxide, plate-like silica, plate-like titanium oxide, plate-like aluminum oxide, or the like, layered compounds such as muscovite, biotite, sericite, kaolinite, talc, or the like, and organic polymer foils such as PET resin films, acrylic resin films, or the like, but the scale-like powder used in the present invention is not particularly limited to this component. In order to improve the light utilization efficiency, it is preferable to use a component having light transmittance also in the flaky powder. The particle size of the flaky powder used in the present invention is not particularly limited, but when the particle size of the flaky powder is in the range of 1 to 200 μm, preferably 10 to 120 μm, the flat body easily gives a beautiful gloss and interference color.

In order to impart an interference color to these flaky powders, the surfaces of the flaky powders are generally covered with a metal oxide, and the metal oxide includes titanium dioxide, iron oxide, titanium suboxide, zirconium oxide, silica, alumina, cobalt oxide, nickel oxide, cobalt titanate, and the like, and Li₂CoTi₃O₈Or KNiTiO_xAnd the like, or a mixture of these metal oxides, but when the metal oxide is a metal oxide which can exhibit an interference color, the metal oxide is not particularly limited to these components.The covering of the flaky powder with these metal oxides is achieved by: a method of heating or neutralizing and hydrolyzing an organic salt or an inorganic salt of these metal oxides, or a vapor deposition operation such as CVD or PVD.

The surface of these interference scale-like powders may be subjected to surface treatment with an organic or inorganic compound as required. The method of using the interference scale-like powder used in the present invention is not particularly limited, and when an interference color appears, the combination with an existing colorant or the order of addition may be arbitrarily employed.

In addition, the interference substance layer used in embodiments 1-5 to 1-6 may be a metal film having an interference color obtained by oxidizing the surface of the metal film. Examples of the method for forming such a metal film include a method of anodizing a metal aluminum, a metal titanium, a stainless steel film, etc., a method of preparing and applying a metal oxide capable of developing the interference color by a sol-gel method, a method of applying a metal alkoxide capable of developing the interference color on a metal film and decomposing the metal alkoxide by heating, and a vapor deposition method such as CVD or PVD.

The colored light-reproducing reflective member of the present invention, which is excellent in the efficiency of utilization of light colored by an interference color, can provide excellent appearance to a marking film, a daily use article such as a shoe, a bag, a hat, or clothing, furniture, an electric appliance, a building, an automobile, a bicycle, a printed matter, or a molded article such as paper, plastic, or metal, and can be used for forgery prevention when the colored light-reproducing reflective member of the present invention is used for such a product.

Embodiments of the reproduction reflecting part of the present invention are described below.

First, a method for producing the interference scale-like powder preferably used in the present invention will be described.

[ production examples 1-1 ]

50 parts by weight of mica was added to 100 parts by weight of ion-exchanged water, and sufficiently stirred to be uniformly dispersed. To the obtained dispersion, 208.5 parts of a 40% strength by weight aqueous solution of titanyl sulfate was added, and it was boiled for 6 hours while being stirred. After cooling, the mixture was subjected to filtration washing and firing at 900 ℃ to obtain 90 parts of titanium dioxide-overcoated mica having a green interference color. The mica coated with titanium dioxide obtained by the above production example 1-1 can be used in the above embodiments 1-1, 1-2 and 1-4.

[ production examples 1-2 ]

50 parts of mica was added to 500 parts of ion-exchanged water, and the mixture was sufficiently stirred to be uniformly dispersed. 312.5 parts of a 40% strength by weight aqueous solution of titanyl sulfate was added to the obtained dispersion, and while stirring, heating and boiling were carried out for 6 hours. After cooling, the coating was washed with filtered water and fired at 900 ℃ to obtain 100 parts of titanium dioxide-overcoated mica having a green interference color. Then, 1.2 parts of metallic titanium was mixed with 100 parts of the obtained mica titanium, and the mixture was stirred with an oil diffusion pump at 10 degrees^-3The mixture was subjected to a thermal reduction treatment at 800 ℃ for 4 hours in a vacuum of not more than Torr. After cooling, 101.2 parts of mica coated with titanium suboxide/titanium dioxide having a vivid greenish color with a pearl gloss in appearance and interference colors were obtained. The mica coated with titanium suboxide (low-acid チタン) obtained in production example 1-2 can be used in the above embodiments 1-1, 1-2 and 1-4, and particularly, a clear color tone of returned light can be obtained.

[ production examples 1 to 3 ]

100 parts of mica titanium (イリオジン 235) manufactured by Merck, Germany was subjected to a reduction treatment at 800 ℃ for 4 hours under an ammonia gas flow of 31/min. After cooling, 98.5 parts of mica coated with titanium oxynitride/titanium dioxide having a vivid greenish color with a pearl gloss in appearance and interference colors were obtained. The mica coated with titanium oxynitride/titanium dioxide obtained in production examples 1 to 3 can be used in the above embodiments 1 to 1, 1 to 2 and 1 to 4, and particularly, can obtain a clear color tone of returned light.

[ production examples 1 to 4 ]

100 parts of the green interference mica titanium obtained by production example 1-2 was added to 200 parts of ion-exchanged water, and stirred to be uniformly dispersed. 110 parts of an aqueous 10% strength cobalt chloride solution were added to the dispersion obtained in the following manner: the mica titanium coated with hydrous cobalt oxide was dried at 105 ℃ for 3 hours at 80 ℃ while maintaining the pH in the range of 4 to 5 with 1M aqueous caustic soda solution, filtered, washed with water, and then dried to obtain 102 parts of mica titanium coated with hydrous cobalt oxide. Next, 100 parts of the obtained mica titanium coated with hydrous cobalt oxide was uniformly mixed with 11.5g of lithium carbonate by means of a small mixer, and the obtained mixed powder was put into a magnetic crucible and subjected to firing treatment at 900 ℃ for 4 hours, thereby obtaining 105 parts of coated Li having a vivid green appearance color₂CoTi₃O₈Mica titanium of (2).

The mica coated with a titanium-based composite oxide obtained in the production examples 1 to 4 can be used in the embodiments 1 to 3 and 1 to 4.

[ production examples 1 to 5 ]

50 parts of mica was added to 500 parts of ion-exchanged water, and the mixture was sufficiently stirred to be uniformly dispersed. 350 parts of a 2M aqueous titanyl sulfate solution was added to the obtained dispersion, heated while stirring it, and boiled for 3 hours. After cooling, the mixture was filtered, washed with water, and dried at a temperature of 200 ℃ to obtain 90 parts of titanium dioxide-coated mica. Next, 50 parts of the obtained titanium dioxide coated mica was added to 500 parts of ion-exchanged water, and stirred to be uniformly dispersed. 295 parts of a 0.42M aqueous cobalt chloride solution were added to the dispersion obtained in the following manner: the mica titanium containing hydrous nickel oxide was obtained in an amount of 54.8 parts by adding the mica titanium at 80 ℃ for 3 hours while maintaining the pH in the range of 4 to 5 with 1M aqueous caustic soda solution, filtering and washing the mixture with water, and then drying the washed mixture at 105 ℃.

Then, the obtained water-soluble nickel-containing mica titanium was uniformly mixed with 2.75 parts of potassium chloride by a small mixer, put into a magnetic crucible, and subjected to firing treatment at a temperature of 900 ℃ for 3 hours, thereby obtaining 51.0 parts of glossy powder having a vivid yellow appearance color and a red interference color.

The mica coated with a titanium-based composite oxide obtained in the production examples 1 to 5 can be used in the embodiments 1 to 3 and 1 to 4.

The invention is described below by way of examples.

[ 1-1 example ]

A silicone resin solution was applied to a whole polyester film having a thickness of 50 μm, and when the resin was dried to such an extent that no flow was generated, transparent glass fine particle beads having a refractive index of 1.9 and a mesh number within the range of 200 to 250 mesh were spread and attached to a single layer so that the half spheres or more were not buried, and were dried, and then heat-treated at 120 ℃ for 3 minutes to temporarily attach the glass fine particle beads. Next, a transparent colored screen printing ink containing the green interference mica titanium of production example 1-1, which was formed in accordance with the mixing ratio in table 2, was used to screen print a pattern on the glass fine particle temporarily adhering surface of the film to which the above-mentioned transparent glass fine particle balls were temporarily adhered, and when the pattern was not dried, nylon resin fine particles having a mesh size in the range of 80 to 250 mesh were spread and adhered and dried, and heat-treated at a temperature of 140 ℃ for 5 minutes or more to obtain a reproduced reflection pattern film (film for reproduction) which exhibited green reflection light of the same color as the interference color in the green interference mica titanium.

TABLE 2

Acrylic resin solution (concentration 45 w/w%) 100 parts of Green interference mica titanium (particle size 10 to 60 μm) of production example 1-1 30 parts of other additive

[ examples 1-2 ]

A silicone resin solution is applied to the entire surface of a polyester film having a thickness of 50 μm, and when the resin is dried to such an extent that no flow occurs, transparent glass fine particle beads having a refractive index of 1.9 and a mesh number within the range of 200 to 250 mesh are spread, and dried while being attached in a single layer so that the half spheres are not buried therein, and thereafter, the glass fine particle beads are temporarily attached by heating at a temperature of 120 ℃ for 3 minutes. Next, a transparent colored screen printing ink formed in accordance with the blending ratio in table 3 was used to screen print a pattern on the polyester film to which the glass microparticle beads had temporarily adhered. Then, aluminum was deposited on the film by vacuum deposition so as to have a thickness of 80 nm. Further, an acrylic resin solution is applied to the surface, fine particles of a dried nylon resin within the range of 80 to 250 mesh are spread and adhered to the surface when the surface is not dried, and the resultant is heat-treated at a temperature of 140 ℃ for 5 minutes or more to obtain a reproduced reflection pattern film (transfer film) which exhibits bluish green reflected light of the same color as the appearance color (interference color) of mica coated with titanium suboxide/titanium dioxide.

TABLE 3

Acrylic resin solution (concentration 45 w/w%) 100 parts of the greenish mica coated with titanium suboxide/titanium dioxide of production example 1-2 (particle size 1)0 to 60 μm)30 parts of other additive materials

[ examples 1 to 3 ]

A silicone resin solution was applied to the entire surface of a polyester film 50 μm thick, and when the resin was dried to such an extent that no flow was generated, transparent glass fine particle spheres having a refractive index of 1.9 and a particle size within the range of 200 to 250 mesh were spread, and dried by single-layer adhesion so that the spheres were not buried above the spheres, and then heated at 120 ℃ for 3 minutes to temporarily adhere the glass fine particle spheres. Next, a transparent coloring screen printing ink having glossy powder with a vivid yellow appearance color and a red interference color formed in accordance with the blending ratio in table 4 was used to print a pattern on the polyester film to which the glass microparticle beads had temporarily adhered.

Next, an acrylic paint was applied to the aluminum powder having an average particle size of 20 μm on the printing surface by using an applicator having a gap of 0.101 mm. Then, an acrylic resin solution is applied on the surface, and when it is not dried, fine particles of a nylon resin having a mesh number within the range of 80 to 250 are spread, adhered and dried, and heat-treated at 140 ℃ for 5 minutes or more to obtain a film (transfer film) having a reproduction reflection pattern, which is yellow in appearance and red in reproduction reflection light.

TABLE 4

Acrylic resin solution (concentration 45 w/w%) 100 parts of glossy powder (particle size 10 to 60 μm) having yellow appearance color and red interference color of production examples 1 to 5 30 parts of other additive materials

[ examples 1 to 4 ]

100g of transparent fine glass particle spheres having a refractive index of 1.9 and a mesh number in the range of 200 to 250 were dispersed in 1000ml of isopropanol, 150g of a titanium tetraisopropoxide solution was added thereto, and then 100ml of a mixed solution of water/isopropanol in a ratio of 1: 1 was dropped at a rate of 5ml/min while maintaining the dispersed solution at a temperature of 30 ℃. After the dropping of the mixed solution, the mixture was continuously stirred for 4 hours, filtered, washed with water, and dried at a temperature of 200 ℃ for 3 hours, thereby obtaining transparent glass microparticle beads having a yellow interference color. Then, a silicone resin solution was applied to the entire surface of a polyester film having a thickness of 50 μm, and when the resin was dried to such an extent that no flow was generated, transparent fine glass particle spheres having a yellow interference color prepared in advance were spread, and single-layer adhesion drying was performed so that the spheres were not buried in the resin, and thereafter, the glass fine particle spheres were temporarily adhered by heating at a temperature of 120 ℃ for 3 minutes. Next, a pattern was screen-printed on a temporary adhesion surface of the film on which the transparent glass fine particle beads were temporarily adhered with a transparent coloring screen printing ink containing mica titanium according to production examples 1 to 4, nylon resin fine particles having a mesh number in the range of 80 to 250 were spread, adhered and dried while the pattern was not dried, and heat-treated at a temperature of 140 ℃ for 5 minutes or more to obtain a reproduced reflection pattern film (film for reproduction) which exhibited yellow reflected light.

In the retroreflective member of the present invention, when a linear light having a certain directivity is irradiated, the refractive index of the glass spheres used is preferably in the range of 1.7 to 2.2, particularly preferably in the range of 1.8 to 2.1, and the average particle diameter is preferably in the range of 20 to 60 μm, particularly preferably in the range of 30 to 50 μm, in order to clearly observe the interference color of the interference substance.

When the refractive index of the glass sphere is greater than this value or less than this value, the focus is blurred, and clear reflected light cannot be obtained. In addition, when the particle diameter of the glass spheres is less than this value, the glass particles are buried in the resin layer, or the effective incident portion of the reproducible reflected light becomes narrow. On the other hand, when the particle diameter of the glass spheres is larger than this value, printing is difficult in the case where the interference substance is screen-printed on the glass particles as described in examples. Further, there are problems that it is also difficult to align the focal length, and ink enters into the gap between the glass balls.

In the case of using a PET film as the outermost layer part in the present invention as in the examples, the thickness of the PET film which can be the outermost layer is preferably in the range of 23 to 150 μm, particularly preferably in the range of 38 to 50 μm. When the thickness of the PET film is more than this value, it is difficult to focus a hard focus, and when less than this value, it causes difficulty in manufacturing due to softness.

As described above, when the retroreflective article of the present invention is used for a product, it can exhibit extremely high forgery prevention. When the interference substance in the reproduction reflecting member of the present invention emits linear light having a certain directivity at an intensity greater than that of ambient light, an interference color is generated. For this reason, when the reproduction reflecting member of the present invention irradiates linear light with an intensity greater than that of ambient light, an interference color formed by the interference substance can be observed in the irradiation direction thereof.

However, since general light itself such as sunlight or illumination has various directivities, the light also enters the retroreflective member of the present invention in various directions. Then, the incident lights interfere with each other variously, and the interference color is difficult to be observed. Therefore, it is difficult to observe interference colors in directions other than the incident direction of the linear light. Therefore, when the retroreflective member of the present invention is used in a product, when the retroreflective member is irradiated with linear light, the pattern or character is made visible by the interference color of the interference material, and thus it is possible to determine whether the product is genuine or counterfeit.

Further, by drawing a figure or a character by using the interference color generated when the linear light is irradiated by operating the position where the interference substance is provided by utilizing the difference between the linear light of the interference substance and the color exhibited by the general light, the figure or the character can be observed under the linear light even in the case where the color obtained by combining the substrate color and the appearance color of the interference substance exhibits a single color under the general light. In addition, since the corresponding figures or characters are drawn in the colors expressed under normal light and the colors expressed under linear light, respectively, the figures or characters observed under normal light and the figures or characters observed under linear light are different, and thus, the appearance and high forgery prevention can be provided.

In the above-described manner, when the retroreflective member of the present invention is used for a product, since it has retroreflective properties, it is difficult to copy the product by a copying machine or the like, and since the irradiated light can exhibit a color tone which can be different depending on whether it is normal light or straight light, it is possible to directly discriminate whether it is a counterfeit product or a genuine product based on an analysis of the color tone or a figure or a character or the like exhibited, by: a linear light irradiation device for emitting linear light is used to irradiate the linear light onto a reproduction reflecting member portion for a product.

When the colored light reproduction reflecting member of the present invention is used in the above-described manner, since the color tone is provided by the interference effect caused between incident lights, the selectivity of the color tone is wide and, in addition, the utilization efficiency of light is high.

Further, in the present invention, since the interference substance is made of mica coated with titanium dioxide or mica coated with titanium suboxide, which has high light transmittance, and the primary plate color has a color, a color tone in which the primary plate color and the interference color are combined is observed in the incident light returning direction, and the primary plate color is observed in the other direction, so that the appearance can be improved.

In the present invention, since the interference material is mica coated with a titanium-based composite oxide, the resultant color tone of the composite oxide color and the interference color can be observed in the incident light returning direction, and the composite oxide color can be observed in other directions, thereby improving the appearance.

Reproducing reflective holographic reproduction

Fig. 7 is a schematic diagram of a general hologram reproduction body. The hologram reproduction body 50 in this figure is composed of a support 52, a release layer 54, a protective layer 56, a hologram layer 58, a reflection layer 60, a coating layer 62, and an adhesive layer 64 in a superposed manner.

The holographic layer 58 and the reflective layer 60 are layers in which light transmitted through the holographic layer 58 having holographic embossings is reflected by the reflective layer 60 in the above-described manner, and the holographic image is reproduced by the reflected light. By adjusting the properties of the material used for the reflective layer 60 or the reflectance to incident light, products called a general easily viewable total reflection type hologram reproduction body, a semi-transparent hologram reproduction body, a transparent hologram reproduction body, and the like are obtained.

The support 52 provides support for the other layers stacked and is peeled off from the other layers after transferring the hologram regenerated body, and for materials having strength, heat resistance, surface properties for achieving the purpose, there are the following components selected, for example, polyethylene terephthalate, polyester, polypropylene, and the like.

In order to easily peel the support 52 from the transferred hologram reproduction body, a peeling layer 54 is used. Obviously, the release layer is also made of resin, but may be a release agent.

The protective layer 56 is used to protect the hologram layer 58, and is made of a material selected from light-transmitting resins having properties such as abrasion resistance, stain resistance, and solvent resistance. The protective layer 56 may serve as a release layer at the same time in view of releasability from the support, or may serve as a hologram layer at the same time in view of providing hologram embossing.

Since the coating 62 is applied to the holographic embossing and reflective layer in the holographic layer 58, the holographic embossing, reflective layer is protected from abrasion, contamination, etc. When the adhesive is bonded to an article such as a card, the adhesive may be bonded to the article without using a coating layer.

The adhesive layer 64 is provided so as to adhere the hologram reproduction body to the article, but in the case where the hologram reproduction body is used as a hologram plate or a hologram film, the adhesive layer may not be provided.

The present invention can produce each layer by the same material or formation method as the general hologram reproduction body shown in fig. 7. The hologram reproduction body of the present invention is characterized in that a reproduction reflection member which returns incident light toward an incident light entering direction is stacked in the hologram reproduction body shown in fig. 7, thereby obtaining the effect of the present invention.

The hologram reproduction body used in the present invention is such that a reproduction reflection layer is further provided by a reproduction reflection member on a semi-transparent hologram reproduction body having a light reflective metal provided on a reflection layer by a semi-vapor deposition method or on a transparent hologram reproduction body using a metal oxide on a reflection layer. The hologram reproduction of the present invention will be described more specifically below according to one embodiment. In addition, the hologram reproduction body of the present invention is not limited to only the embodiments described below.

2 nd to 1 st embodiment

Fig. 8 shows a schematic structure of a reproduced reflection hologram reproduction body according to an embodiment of the present invention. The hologram reproduction device according to the present invention employs the above-described embodiment 1-1 as a reproduction reflecting member.

Accordingly, the same reference numerals are used for the parts corresponding to fig. 2 described above.

In the reproduced reflection hologram reproduction body in this figure, a reproduction reflection layer 68 formed of a reproduction reflection member is superposed on a transparent hologram plate in which a hologram layer 58 having holographic emboss, a reflection layer 60, a coating layer 62 are superposed. In the present embodiment, the hologram layer 58 serves as both the release layer 54 and the protective layer 56 in fig. 7.

A part of the light 18b incident from the outside of the hologram plate 66 is transmitted through the hologram layer, and is reflected by the reflection layer 60 included in the hologram plate 66, thereby forming reflected light 20'. In addition, transmission occurs through the reflection layer 60 and the coating layer 62, and the incident layer 18a entering the reproduction reflection layer 68 is reflected on the main plate 12 and enters the hologram plate 66 again, thereby forming reflected light 20 passing through toward the outside. In the holographic plate 66, these reflected lights 20, 20' interfere in a refractive manner by the holographic embossing provided in the holographic layer, thereby causing the holographic image to appear.

The reproduction reflective layer 68 is configured in such a manner that: a resin layer 14 is provided on a main plate 12, and a plurality of transparent microspheres 16 made of glass having a particle diameter of 30 to 80 μm are provided in a row on the surface layer thereof. The light transmitted through the hologram plate 66 and traveling inside the microspheres 16 is reflected from the transparent microspheres on the main plate 12 via the resin layer 14, returns to the microspheres 16 again, and travels toward the outside. Since the outwardly projecting surface of the small microsphere 16 is a spherical surface, the same effect is produced even when the incident angle is changed to some extent, and the reflected light 20 can be returned in the incident direction.

The hologram reproduction body of the present invention is characterized in that the reflected light 20 of the incident light 18a is colored by interference of light, and for this reason, according to the present embodiment, an interference material layer 22 is provided on the main plate 12. As a result, the incident light 18a interferes with the light by the interference material layer 22, and the reflected light 20 has a color tone of a wavelength emphasized by the interference action.

Therefore, as shown in fig. 2 described with respect to the above-described retroreflective member, the interference material 22 in the retroreflective layer 68 is constituted of mica coated with titanium dioxide in the present embodiment, and the mica 22 coated with titanium dioxide is constituted of scaly mica 24 and a titanium dioxide layer 26 coated on the mica 24. Thus, a portion 20a of the incident light 18 is reflected by the surface of the titanium dioxide layer 26, while another portion 20b is reflected by the interface between the mica 24 and the titanium dioxide layer 26. The reflected light 20a and the reflected light 20b have an optical path difference of about 2 times that of the titanium dioxide layer 26, and of the wavelength components of the reflected light 20a and the reflected light 20b, a component having an optical path difference of an odd multiple of a half wavelength is amplified, and a component having an optical path difference of an integral multiple of a wavelength is attenuated. As a result, by adjusting the layer thickness of the titanium dioxide layer 26, the reflected interference light 28 of a desired color tone can be obtained. In addition, as shown in FIG. 8, the colored reflected interference light 28 passes through the transparent microspheres 16 and returns in substantially the same direction as the incident light.

Further, in the present embodiment, if the reflectance of the titanium dioxide-overcoated mica 22 is increased, the colored reflected interference light 28 can be clearly observed in the returning direction.

In the above manner, the reproduced reflective hologram reproduction body of the present invention having a structure in which the reproduction reflective layer 68 and the hologram plate 66 are stacked exhibits different effects depending on the irradiation light.

As described below with reference to fig. 8 again, since the directivity of light emitted from the light source is not determined under normal light of general illumination such as sunlight or a fluorescent lamp, light incident on the reproduced reflection hologram reproduction body also enters in a plurality of directions. Therefore, even when light incident on the reproduction reflection layer 68 appears, the light reacts with the reflected light 20' generated by the reflection layer 60 in the transparent hologram plate 66 to form complicated light, and thus color due to interference of the reproduction reflection member using the reproduction reflection layer cannot be observed. However, even in the case of such normal light, the hologram layer can reproduce a hologram image by causing interference of light having a specific direction by the action of refraction or the like of the hologram embossing.

Therefore, even when characters and figures are drawn under normal light, the characters and figures cannot be confirmed by the interference color expressed by the interference substance used in the reflecting member, and only the hologram image is observed, and the hologram image shown in fig. 9 is observed, and the figure drawn by the interference substance cannot be confirmed.

However, if the reproduction reflection hologram reproduction body of the present invention is irradiated with a linear light emitted from a light source in a certain direction at an intensity higher than that of the ambient light, the interference substance appears as an interference color only when viewed in the linear light irradiation direction due to the reproduction reflectivity of the reproduction reflection layer 68, and characters or figures drawn by the interference substance shown in fig. 10 can be recognized. At this time, the hologram image reproduced by the interference of light is hardly observed due to the effect of the hologram embossing in the hologram layer. The reason for this is considered to be: due to the effect of the retroreflectivity of the retroreflecting layer 68, the weak light interfering with the hologram image to be reproduced disappears due to the reflected light strongly returning in the observation direction.

In the above-described manner, in the reproduction reflection hologram reproduction body in which the pattern drawn by the provision of the interference substance can be recognized by only the interference color exhibited by the interference substance when the linear light is irradiated, if the pattern drawn by the interference substance is different from the hologram image, the hologram image appears under normal light such as sunlight or illumination, and when the linear light is irradiated, the pattern different in color from that developed by the interference of the light is projected with respect to the hologram image, and when the hologram image is not visible, the pattern drawn by the interference substance can be seen. In order to identify whether the product is genuine or counterfeit, the pattern is exposed by a straight light beam to determine whether the product is genuine or counterfeit.

In order to impart the appearance, decorativeness, and high forgery prevention to the hologram reproduction body, the present inventors have employed a retroreflective member that can impart an interference color to the returning light by means of a substance that generates a colored interference color in the optical path.

Further, if the reproduction reflecting layer 68 of the present embodiment is employed, since the color tone is given to the returning light by the interference action of light, the utilization rate of light is extremely high, and further, by adjusting the thickness of the titanium dioxide layer, an arbitrary color tone can be obtained. Further, since the interference color is generated by chemically and optically stable inorganic substances, i.e., mica coated with titanium dioxide, a reproduction reflective layer having excellent heat resistance and durability can be formed.

Further, as described above, when mica coated with titanium dioxide is used, it is confirmed that the layer thickness of titanium dioxide and the interference color have the relationship shown in Table 1.

Therefore, the mica coated with titanium dioxide preferably has a geometric layer thickness of 40nm or more.

In the present embodiment, the main plate 12 is used as the reconstruction reflection layer 68, but the main plate 12 used for the reconstruction reflection hologram reconstruction body of the present invention does not necessarily have light reflectivity. The reason for this is that: the interference substance layer 32 provided on the main plate also has high reflectivity. For this reason, even in the case where the main board 12 is not employed, the above-described effects can be obtained.

2 nd to 2 nd embodiments

In embodiment 2-2, the retroreflective layer 68 of fig. 8 employs the retroreflective member described in embodiment 1-2. As described below with reference to fig. 2, in the 2 nd to 1 st embodiment, when the light transmittance of the titanium dioxide coated mica 22 is adjusted, the color of the main board 12 can be observed. Therefore, if a plate having high light reflectivity is used as the main plate 12, the light transmittance of the mica 22 coated with titanium dioxide is adjusted to increase the reflection ratio of the main plate 12, and the reflected light 30 of the main plate 12 is observed. Therefore, when the main plate 12 is colored, the color tone of the return light 20 is a composite color tone of the colored reflected interference light 28 and the reflected light 30 showing the main plate color. In this case, in the other direction than the return direction of the incident direction, the colored reflected interference light 28 is not substantially observed, but the color tone of the reflective main plate 12 is observed, so that light observed in the direction of the light source emitting linear light having a certain directivity and light observed in the other direction can be observed with different color tones.

In addition, in the case where the main plate is not reflective, for example, in the case where a pigment layer is used for the main plate, the color of the pigment can be observed under normal light, and the interference color formed by the interference substance can be observed under straight line light. Therefore, a hologram reproduction body substantially limited to a silver color can be provided with a rich color.

Embodiments 2 to 3

In the present embodiment, the retroreflective member described in embodiments 1 to 3 above is used as the retroreflective layer. This is described below with reference to fig. 3.

The interference material 122 of this embodiment is colored mica coated with a titanium-based composite oxide.

Also in this case, similarly to embodiment 2-2, in the return light 128, the color tone of the composite oxide 126 and the interference color based on the optical path difference of the composite oxide layer are synthesized and observed, and on the other hand, the color tone observed in the direction other than the light source of the straight light is the color tone of the mica 126 itself overcoated with the composite oxide.

In the present embodiment, if the color of the appearance color of the interference substance used and the color exhibited by interference are taken into consideration, the pattern formed by the appearance color may be different from the pattern formed by the interference color. Further, by using an interference substance having the same appearance color and different interference colors, a hologram reproduction body in which a hologram image appears on a reflection surface having a single color in a direction other than the direction of irradiation of the linear light, but a different pattern formed by the interference colors can be observed in the direction of irradiation of the linear light can be formed.

Embodiments 2 to 4

In the present embodiment, the retroreflective member described in embodiments 1 to 4 above is used as the retroreflective layer. This is described below with reference to fig. 4.

In the retroreflective layer 210 shown in this figure, an interference substance is attached to the buried surface of the resin layer 214 of the transparent microspheres 216. In addition, as the interference material to be adhered, general interference coated titanium dioxide mica or colored coated composite oxide mica can be used.

In this case, whether the microspheres 216 and the interference material 222 return by repeating reflection or return by reflection on the reflection master 212 is determined by factors such as the difference in refractive index between the transparent microspheres 216 and the interference material 222. Even in the case where light passes through the interference substance layer 222, reflected by the main plate 212, colored return light is obtained due to the transmitted interference light generated when the light passes through the interference substance 222.

Embodiments 2 to 5

In the present embodiment, the retroreflective member described in embodiments 1 to 5 above is used as the retroreflective layer. This is described below with reference to fig. 5.

In the reproduction reflective layer 310 shown in the figure, the interference substance 322 is directly provided on the reflective main plate 312. In addition, a specific color tone can be obtained by interference between the reflected light 320a reflected by the surface of the interference substance 322 and the reflected light 320b reflected on the reflection main plate 312.

Embodiments 2 to 6

In the present embodiment, the retroreflective member described in embodiments 1 to 6 above is used as the retroreflective layer. This is described below with reference to fig. 6.

In the retroreflective layer 410 shown in this figure, an interference substance 422 is formed on the buried surface of the resin layer 414 of the transparent microspheres 416. In this case, the reflective layer 440 is provided on the outer edge of the interference material layer 422, and a specific color tone can be obtained by interference between the reflected light 420a generated at the interface between the transparent microspheres 416 and the interference material 422 and the reflected light 420b of the reflective layer 440.

Further, as described with respect to the retroreflective member, it is preferable that the interference material used in the embodiments 2-1 to 2-4 is an interference scale-like powder represented by the mica coated with titanium dioxide.

Therefore, the scale-like powder constituting the main body of the interference scale-like powder includes, for example, powders of metallic aluminum, metallic titanium, stainless steel, or the like, inorganic plate-like oxides such as plate-like iron oxide, plate-like silica, plate-like titanium oxide, plate-like aluminum oxide, or the like, layered compounds such as muscovite, biotite, sericite, kaolin, talc, or the like, and organic polymer foils such as PET resin films, acrylic resin films, or the like, but the scale-like powder used in the present invention is not limited to these components. In order to improve the light utilization efficiency, it is preferable to use a flaky powder having light transmittance therein. Further, the particle size of the flaky powder used in the present invention is not particularly limited, and when it is in the range of 1 to 200. mu.m, particularly preferably in the range of 10 to 120. mu.m, a flat powder easily exhibits beautiful luster and interference color.

In order to impart an interference color to these flaky powders, the surfaces of the flaky powders are generally covered with a metal oxide, and the metal oxide includes titanium dioxide, iron oxide, titanium suboxide, zirconium oxide, silica, alumina, cobalt oxide, nickel oxide, cobalt titanate, and the like, and Li₂CoTi₃O₈Or KNiTiO_xAnd the like, or a mixture of these metal oxides, and the like, as long as they are metal oxides capable of expressing an interference color, are not particularly limited to these components. The coating of these metal oxides on the flaky powder can be carried out by: these metal oxide organic or inorganic salts are subjected to heating or neutralization and hydrolysis, or vapor deposition such as CVD or PVD.

The surface of these interference scale-like powders may be subjected to surface treatment with an organic or inorganic compound, as required. The method of using the interference scale-like powder used in the present invention is not particularly limited, and any combination with a conventional colorant or any order of addition may be used as long as the interference color is expressed.

As described above with respect to the retroreflective member, the interference substance layer used in embodiments 2-5 to 2-6 may be a metal film having an interference color obtained by oxidizing the surface of the metal film, and examples of the metal film include a method of anodizing a metal aluminum, a metal titanium, a stainless steel film, or the like, a method of preparing and applying a metal oxide capable of expressing the interference color by a sol-gel method, a method of applying a metal alkoxide capable of expressing the interference color to a metal film and then heating the metal oxide, and a deposition method such as CVD or PVD.

As described above, the reproduction reflective layer excellent in the utilization efficiency of light colored by an interference color of the present invention can provide a hologram reproduction body with high forgery prevention, appearance, and decoration properties.

In addition, by rendering the colors of the interference substances, characters or images can be drawn, thereby providing higher anti-counterfeiting performance.

The following describes an embodiment of the hologram reproduction body of the present invention.

[ 2-1 example ]

A protective layer of 0.5 μm thickness made of cellulose acetate resin was provided on a support of a polyethylene terephthalate film of 25 μm thickness, and the protective layer was used as a release layer, and a mold was closely adhered thereto by pressing, wherein a resin surface of a hologram layer of 2.5 μm thickness made of acrylic resin was etched to form an uneven portion, and irradiated with an electron beam to be cured, and aluminum as a reflective layer was semi-evaporated. A coating layer having a thickness of 12 μm and formed of a PET resin is provided thereon, a silicone resin solution is applied to the entire coating layer, and when the coating layer is dried to such an extent that the resin does not flow, transparent glass fine particles having a refractive index of 1.9 and a mesh number in the range of 200 to 250 are spread, single-layer adhesion drying is performed so that the half spheres or more thereof are not buried, and then heating treatment is performed at a temperature of 120 ℃ for 3 minutes to temporarily adhere the glass fine particles. Next, using a transparent coloring screen printing ink including the green interference mica titanium of production example 1-1 in the mixing ratio shown in table 5, on the glass fine particle temporarily adhering surface of the film having the transparent glass fine particles temporarily adhered thereto, a pattern was printed by screen printing, and when the pattern was not dried, nylon resin fine particles having a mesh number within a range of 80 to 250 were spread, adhered and dried, and heat-treated at 140 ℃ for 5 minutes or more, thereby obtaining a reproduced reflection hologram reproduction body (film for reproduction) showing green reflected light of the same color as the interference color of the green interference mica titanium.

TABLE 5

Acrylic resin solution (concentration 45 w/w%) 100 parts of Green interference mica titanium (particle size 10 to 60 μm) of production example 1-1 30 parts of other additive

[ examples 2 to 2 ]

A protective layer of 0.5 μm thickness made of cellulose acetate resin was provided on a support of a polyethylene terephthalate film of 25 μm thickness, and the protective layer was used as a release layer, and a mold was closely adhered thereto by pressing, wherein a resin surface of a hologram layer of 2.5 μm thickness made of acrylic resin was etched to form a concavo-convex portion, and irradiated with an electron beam to be cured, and titanium dioxide as a transparent reflective layer was subjected to vapor deposition treatment. Furthermore, the entire surface of the glass is coated with a silicone resin solution, and when the resin is dried to such an extent that the resin does not flow, the glass is temporarily attached by spreading transparent glass fine particles having a refractive index of 1.9 and a mesh number within a range of 200 to 250, drying the glass fine particles by single layer attachment so that the particles do not sink over the hemisphere, and then heating the glass fine particles at 120 ℃ for 3 minutes. Next, a transparent coloring screen printing ink containing the blending ratio shown in table 6 was used to form a pattern by screen printing on the film to which the glass fine particles were temporarily attached. Then, aluminum was deposited on the film by vacuum deposition so as to have a thickness of 80 nm. Further, the surface is coated with an acrylic resin solution, and when it is not dried, fine particles of a nylon resin having a mesh number in the range of 80 to 250 are spread, adhered and dried, and heat-treated at a temperature of 140 ℃ for 5 minutes or more, thereby obtaining a reproduced reflection hologram (film for copying) which exhibits a greenish reflected light substantially the same as the appearance color (interference color) of mica coated with titanium suboxide and titanium dioxide.

TABLE 6

Acrylic resin solution (concentration 45 w/w%) 100 parts of the greenish mica coated with titanium suboxide/titanium dioxide (particle size 10 to 60 μm) of production example 1-2 30 parts of other additives

[ examples 2 to 3 ]

A protective layer of 0.5 μm thickness made of cellulose acetate resin was provided on a support of a polyethylene terephthalate film of 25 μm thickness, and the protective layer was used as a release layer, and a mold described below was closely adhered thereto by pressing, and on the resin surface of a hologram layer of 2.5 μm thickness made of acrylic resin, concave and convex portions were etched, and irradiated with an electron beam to be cured, and aluminum as a reflective layer was deposited by vapor deposition. A coating layer having a thickness of 20 μm and formed of a PET resin is provided thereon, a silicone resin solution is applied to the entire surface of the coating layer, and when the coating layer is dried to such an extent that the resin does not flow, transparent glass fine particles having a refractive index of 1.9 and a mesh number in the range of 200 to 250 are spread, single-layer adhesion drying is performed so that the half spheres or more thereof are not buried, and then, heating treatment is performed at a temperature of 120 ℃ for 3 minutes to temporarily adhere the glass fine particles. Next, a transparent coloring screen printing ink including glossy powder having a vivid yellow appearance color and a red interference color in accordance with the blending ratio of table 7 was used to print a pattern on the film to which the glass fine particles were temporarily attached.

Next, an aluminum powder having an average particle size of 20 μm was sprayed on the printed surface by an acrylic paint using an applicator having a gap of 0.101 mm. Then, an acrylic resin solution was applied on the surface, and when it was not dried, fine particles of a nylon resin having a mesh number in the range of 80 to 250 were spread, adhered and dried, and heat-treated at 140 ℃ for 5 minutes or more, thereby obtaining a reproduced reflection hologram (film for reproduction) having an appearance color of yellow and reproduced reflection light of red.

TABLE 7

Acrylic resin solution (concentration 45 w/w%) 100 parts of glossy powder (particle size 10 to 60 μm) having yellow appearance color and red interference color of production examples 1 to 5, 30 parts of other additive materials

[ examples 2 to 4 ]

100g of transparent glass microspheres having a refractive index of 1.9 and a mesh number in the range of 200 to 250 were dispersed in 1000ml of isopropanol, 150g of a titanium tetraisopropoxide solution was added thereto, and then 100ml of a mixed solution of water/isopropanol in a ratio of 1: 1 was dropped into the dispersion at a rate of 5ml/min while maintaining the dispersion at a temperature of 30 ℃. After dropping, the mixture was continuously stirred for 4 hours, filtered, washed with water, and dried at a temperature of 200 ℃ for 3 hours, thereby obtaining transparent glass microspheres having a yellow interference color. Further, a protective layer of 0.5 μm thickness formed of a cellulose acetate resin was provided on a support of a polyethylene terephthalate film of 25 μm thickness, and the protective layer was used as a release layer, and a mold was closely adhered thereto by pressing, and on the resin surface of a hologram layer of 2.5 μm thickness formed of an acrylic resin, concave and convex portions were etched, irradiated with an electron beam, and cured, and titanium dioxide as a transparent reflective layer was vapor-deposited. A coating layer having a thickness of 12 μm and formed of a PET resin was provided thereon, a silicone resin solution was applied to the entire surface of the coating layer, and when the coating layer was dried to such an extent that the resin did not flow, transparent glass fine particles having a yellow interference color, which had been prepared in advance, were spread over the entire surface, and were subjected to single-layer adhesion drying so as not to bury over the hemisphere thereof, followed by heating treatment at a temperature of 120 ℃ for 3 minutes to temporarily adhere the glass fine particles. Next, using a transparent coloring screen printing ink containing mica titanium of production examples 2 to 4, a pattern was printed on the temporary adhesion surface of the transparent glass fine particle of the film on which the glass fine particles were temporarily adhered, and when the pattern was not dried, nylon resin fine particles having a mesh number in the range of 80 to 250 were spread, adhered and dried, and heat-treated at a temperature of 140 ℃ for 5 minutes or more, thereby obtaining a reproduced reflection hologram (film for reproduction) described below, which exhibited yellow reflected light.

In addition, in the present embodiment, a method of forming a reproduction reflection layer on a hologram plate is used, but the present invention is not necessarily limited to this method, and the present invention may also be applied to a method of forming an interference material layer on a master plate, spreading transparent glass fine particles thereon, forming a reproduction reflection layer, then forming a coating layer, a reflection layer, a hologram layer, and a protective layer, and laying a hologram plate previously stacked at a place where the reproduction reflection layer of the present invention is formed, whereby the effects of the present invention can be obtained, and the present invention is not particularly limited to these forming methods.

In the reproduced reflection hologram of the present invention, when a linear light having a certain directivity is irradiated, it is preferable that the refractive index of the glass spheres used is in the range of 1.7 to 2.2, particularly preferably in the range of 1.8 to 2.1, and the average particle diameter thereof is in the range of 20 to 60 μm, particularly preferably in the range of 30 to 50 μm, so that the pattern or character drawn by the interference substance can be clearly observed.

When the refractive index of the glass sphere is greater than the above value or less than the above value, the focus is blurred, and thus clear reflected light cannot be obtained. In addition, when the particle diameter of the glass spheres is less than the above value, the glass particles are buried in the resin layer, or an effective incident portion capable of reproducing reflected light becomes narrow. On the contrary, when the particle diameter of the glass spheres is larger than the above value, in the case where the interference substance is screen-printed on the glass particles described in the above examples, it is difficult to perform the printing. Further, there is also a problem that it is difficult to align the focal length, and further, ink enters into the gap between the glass spheres.

Further, the hologram layer portion in the reproduced reflection hologram reproduction of the present invention is preferably in the range of 20 to 75 μm, and particularly preferably in the range of 23 to 50 μm. When the thickness of the hologram layer is greater than this value, safety may be lowered, and when the thickness is less than the above value, manufacturing difficulty may be caused.

Since the reproduced reflection hologram reproduction of the present invention employs a hologram plate which is difficult to copy in addition to the reproduced reflection member, it is obvious that a counterfeit or a genuine product can be directly discriminated by analyzing the color tone, pattern, character, or the like presented by irradiating a portion of the reproduced reflection member used in the product with a linear light by using a linear light irradiation device which emits a linear light, as in the case of the reproduced reflection member, and it is difficult to copy by using a copying machine or the like.

As described above, according to the reproduced reflection hologram reproduction body of the present invention, since the color tone is provided by the interference action between the incident lights, the selectivity of the color tone is wide and, in addition, the utilization rate of the light is high.

Further, in the hologram reproduction body of the present invention, when the master plate is included in the reproduction reflection layer, since the interference substance is titanium dioxide-coated mica or titanium suboxide-coated mica having high light transmittance, and the master plate is colored, the composite color tone of the master plate color and the interference color can be observed in the straight light returning direction, and the master plate color can be observed in the other directions, so that the appearance can be improved.

In the hologram reproduction of the present invention, since the interference substance is mica coated with a titanium-based composite oxide, the composite color tone of the composite oxide color and the interference color can be observed in the direction of returning the straight light, and the composite oxide color can be observed in the other direction, thereby improving the appearance.

Further, in the present invention, since the characters or figures are drawn by the difference of the interference colors with respect to the incident light by operating the position where the interference substance is disposed, the figures are displayed by the interference colors only when the interference substances meet the straight light, so that the appearance and the forgery prevention can be improved.

Claims (16)

1. A colored light reproducing/reflecting member which causes a part of incident light to have a phase difference, recombines the incident light, enhances a light component in a specific wavelength region by an interference method, and returns colored light of a color tone different from that of the incident light in the incident direction of the incident light. Characterized in that the colored light reproduction reflecting member includes:

a reflective main board;

a plurality of transparent microspheres arranged on the main board in rows;

an interference substance layer that generates a colored interference color;

wherein the interference substance layer is provided between the transparent microspheres and the reflective main plate, or on a surface of the transparent microspheres opposite to the reflective main plate.

2. The colored light reproducing reflecting member according to claim 1, wherein said interference material layer is a scale-like powder coated with an oxidized metal.

3. The colored light reproducing reflective member according to claim 2, wherein said metal oxide-coated scale-like powder is coated titanium dioxide mica and/or coated titanium suboxide mica having a titanium oxide layer thickness of 40nm or more.

4. The colored light reproducing reflective member according to claim 3, wherein said reflective main plate has a color tone different from an interference color of the mica coated with titanium oxide.

5. The colored light reproducing reflective member according to claim 2, wherein the oxidized metal-coated scale-like powder is a titanium-coated mica having an appearance color different from an interference color thereof.

6. The colored light recycling reflective member according to claim 1, wherein said interference material layer is a surface oxidized metal thin film.

7. A retroreflective hologram reproduction body characterized in that a retroreflective member and a hologram reproduction body are laminated, wherein the retroreflective member is as described in any one of claims 1 to 6, and the hologram reproduction body reproduces a three-dimensional image by laminating a hologram layer and a reflective layer.

8. The retroreflective hologram reproduction according to claim 7, wherein the retroreflective member is composed of an interference substance layer that produces colored interference colors and transparent microspheres that are arranged in rows on the interference substance layer.

9. The reproduction of reflection holograms according to claim 8, wherein said interference substance layer is a scaly powder coated with an oxidized metal.

10. The reproduction reflection hologram reproduction body according to claim 9, wherein the metal-clad scale-like powder is a titanium oxide layer-clad titanium dioxide mica and/or a titanium suboxide-clad mica having a thickness of 40nm or more.

11. The reproduction reflection hologram reproduction body according to claim 10, wherein the scale-like powder coated with an oxidized metal is a titanium-coated composite oxide mica having an appearance color different from a color tone of interference color thereof.

12. The reproduction of a reflection hologram according to claim 8, wherein the interference substance layer is a surface oxidized metal thin film.

13. The reproduction of a reflection hologram according to claim 7, wherein a text or a figure is drawn with respect to a difference in interference color exhibited by incident light by operating a position where the interference substance layer is provided.

14. The hologram reproduction body according to any one of claims 8 to 12, wherein a text or a figure is drawn with respect to a difference in interference color with respect to incident light by operating a position where the interference material layer is provided.

15. The reproduction hologram reproduction body according to claim 13, wherein the interference substance is used to draw a character or a figure different from the hologram image reproduced by the hologram layer.

16. The reproduction of reflection holograms according to claim 14, wherein said interference substance is adapted to draw a text or a figure different from the hologram reproduced by the hologram layer.