JP2017111248A - Coloring structure body and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structural color body having a high color contrast.SOLUTION: A coloring structure body includes: a base material; a rugged structure composed of an aggregate of a plurality of salients formed on the base material or a surface of the base material; and a laminate composed of two or more layers respectively containing materials transmitting light with the same wavelength range and having a difficult refractive index to the light of the wavelength range on the rugged structure. The rugged structure is a moth-eye structure including a material reflecting or absorbing the light of the wavelength range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coloring structure that develops color with a structure formed on a surface and a method for producing the same.

  Unlike a coloring phenomenon that involves electronic transitions due to light absorption such as dyes, the substance itself does not absorb light, but it does not cause diffraction, interference, or scattering by a periodic structure that is the same as or smaller than the wavelength of light Utilizing this, there is a coloring phenomenon that develops color by reflecting or transmitting only light of a specific wavelength. Hereinafter, in this specification, this coloring phenomenon is referred to as structural coloring.

  For example, when the structure color is composed of an inorganic dielectric material that does not deteriorate due to ultraviolet rays, the structure does not fade even when left in an environment irradiated with ultraviolet rays as long as the structure is maintained.

  In addition, structural color development using diffraction and interference has a feature that the wavelength of light recognized by the observation angle changes, so that high designability can be expressed.

  As a color developing body by such a structural color development, a color forming structure using multilayer film interference in which polymer materials having different refractive indexes are formed in a multilayer structure has been proposed (Patent Document 1).

  However, since the color developing structure proposed in Patent Document 1 is a multilayer structure of polymer materials, the refractive index difference between the materials constituting the adjacent layers is small, and multiple layers are stacked in order to obtain strong reflection. This increases the manufacturing cost. Furthermore, the influence of multilayer film interference becomes dominant, and the color change depending on the viewing angle becomes steep, making it difficult to express a specific color with a wide viewing angle.

  In view of this, a display device has been proposed that has a coloring structure having a coloring characteristic such as a morpho butterfly that inhabits nature and has a strong reflection and a gradual color change depending on an observation angle (Patent Document 2). ).

Further, a SiO ₂ fine particle layer in which silicon dioxide (SiO ₂ ) fine particles are arranged is formed on a substrate, a chromium (Cr) layer is formed on the SiO ₂ fine particle layer for light absorption, and the Cr layer is formed on the Cr layer. A light reflection plate in which titanium dioxide (TiO ₂ ) layers and SiO ₂ layers are alternately laminated has also been reported (Non-patent Document 1).

JP 2000-246829 A JP 2007-225935 A

Journal of the Optical Society of America A, Volume 30, No. 5, Page 962

  The color developing structure proposed in Patent Document 2 is formed of irregularities in the concavo-convex structure due to interference by the laminated film by forming a non-uniform concavo-convex structure on the substrate and forming a laminated film on the concavo-convex structure. A light spreading effect is given, and a gradual color change according to the viewing angle is realized.

  However, when the base material and the concavo-convex structure are made of a material that transmits light in the visible wavelength band, the light transmitted through the laminated film passes through the color former back as it is. Therefore, when viewed from the front side in an environment where light is irradiated not only from the front side of the color developing structure, but also from the back side, light transmitted from the back side is also observed, resulting in a decrease in color contrast. .

  In order to prevent a decrease in color contrast, even if a material that absorbs light in the visible wavelength range is formed on the back side of the color former, reflection at the interface with the substrate occurs. In addition, when the base material or the concavo-convex structure is changed to a material that absorbs light in the visible wavelength band such as carbon, for example, in applying the optical nanoimprint method using the resin effect by ultraviolet irradiation in the concavo-convex structure formation, Since it becomes impossible to irradiate ultraviolet rays from the substrate side, it becomes difficult to apply a highly productive photo nanoimprint method to the production of the color developing structure.

On the other hand, the light reflecting plate reported in Non-Patent Document 1 gives irregularity to the width and height of the concavo-convex structure by giving the particle diameter of the SiO ₂ fine particles 200 to 400 nm, Furthermore, since the light transmitted through the laminated film composed of the TiO ₂ layer and the SiO ₂ layer formed on the Cr layer is absorbed by the Cr layer formed on the fine particles, a reflector with high color contrast can be obtained.

However, since Cr is deposited on the SiO ₂ fine particles, the surface roughness of the Cr layer surface is smaller than the surface roughness of the SiO ₂ fine particles. As a structure for preventing reflection of incident light, an aggregate of protrusion structures that imitates the eye of a moth is generally known. When an antireflection effect is obtained by an assembly of such protrusion structures, it is said that the higher the structure height of the protrusion structure, the higher the antireflection effect. However, in the reflector reported in Non-Patent Document 1, since the surface roughness of the Cr layer surface is defined by the particle diameter of the SiO ₂ fine particles, it is difficult to control the antireflection effect by the Cr layer.

Furthermore, since the SiO ₂ fine particles are arranged in a self-organized manner, there is a risk that the optical characteristics and the like will vary in the manufacture of the light reflecting plate, and the yield may be reduced.

  Therefore, an object of the present invention is to provide a coloring structure having a high color contrast and a method for producing the same.

  The color developing structure according to the present invention transmits a light having the same wavelength band on a concavo-convex structure composed of a base material, a base material surface or a base material, and a plurality of convex portions. And a laminate composed of two or more layers made of materials having different refractive indexes for light in the wavelength band, and the concavo-convex structure is made of a material that reflects or absorbs light in the wavelength band. The concavo-convex structure is composed of an assembly of protrusion structures that imitate the eye of the eyelid.

  Alternatively, the color developing structure according to the present invention includes a base material, a concavo-convex structure composed of a plurality of convex portions formed on the base material surface or the base material, and light having the same wavelength band on the concavo-convex structure. And a laminate composed of two or more layers made of materials having different refractive indexes with respect to light in the wavelength band, and the concavo-convex structure has a flat portion between adjacent convex portions. It is a concavo-convex structure that exists, and has a layer composed of a material that reflects or absorbs light in the wavelength band between the concavo-convex structure and the laminate.

  Further, the present invention includes a base material, a concavo-convex structure formed on the base material surface or the base material, and a laminate composed of two or more layers on the concavo-convex structure, and is irradiated with a predetermined wavelength band. The present invention relates to a method for producing a coloring structure that selectively reflects light of a part of the wavelength of light, and an optical nano having a lattice structure in which a plurality of concave portions are arranged in a lattice shape on a substrate An optical nanon print in which a flat portion exists between adjacent concave portions and the center of the concave portion is distributed with a deviation smaller than the pitch from the center position determined by the lattice structure of the lattice structure. A step of preparing a mold for use, a step of applying a photocurable resin to a substrate, a step of transferring a structure formed in the mold to the photocurable resin layer by a photoimprint method, and forming a concavo-convex structure On the substrate on which the concavo-convex structure is formed, A step of forming a metal layer that reflects light, and a layered structure are formed by alternately laminating materials on the metal layer that transmit light in the wavelength band and have different refractive indexes for the light in the wavelength band. And a film forming step.

  The present invention includes a base material, a concavo-convex structure formed on the surface of the base material or on the base material, and a laminate composed of two or more layers on the concavo-convex structure, and is irradiated with light of a predetermined wavelength band. A method for producing a coloring structure that selectively reflects light having a part of the wavelength, and a mold for optical nanoprinting having a lattice structure in which a plurality of recesses are arranged in a lattice pattern on a substrate A thermal nanonprint mold in which a flat part exists between adjacent concave parts, and the center of the concave part is distributed with a deviation smaller than the pitch from the center position determined by the lattice structure of the lattice structure. Steps of preparing, applying a thermoplastic resin or thermosetting resin to the substrate, and transferring the structure formed in the mold to the thermoplastic resin layer or thermosetting resin layer by the thermal imprint method The process of forming the structure and the uneven structure A step of forming a metal layer that reflects light in the wavelength band on the formed substrate, and a light that transmits light in the wavelength band and has a different refractive index with respect to the light in the wavelength band. And alternately stacking materials to form a laminate.

  According to the present invention, since the reflection of light transmitted through the laminate of the coloring structure is suppressed by the concavo-convex structure, a coloring structure with high color contrast can be realized.

1 is a schematic cross-sectional view of a coloring structure according to a first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a color developing structure according to a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a coloring structure according to a third embodiment of the present invention.

  In the present invention, the wavelength band in which the color forming structure acts is determined by the line width and arrangement pitch of the convex portions (concave portions) constituting the concavo-convex structure, and the refractive index and film thickness of the laminate formed on the concavo-convex structure. The In the present invention, the wavelength band targeted by the coloring structure is not limited, but in the following embodiments, a coloring structure that specifically targets light in the visible region will be described with reference to the drawings. In the present embodiment, the visible region refers to light having a wavelength band of 360 nm to 830 nm.

(First embodiment)
FIG. 1 is a schematic cross-sectional view of the structural color body according to the first embodiment. Materials that reflect light in the visible wavelength band, such as silicon (Si), aluminum (Al), tantalum (Ta), Cr, or materials that absorb light in the visible wavelength band, such as carbon (C) A protrusion structure (moth-eye structure) 21 that imitates the eye of the eyelid as shown in FIG. 1A is formed on the base material 11 constituted by applying a known technique such as lithography or dry etching. . By the protrusion structure 21, the refractive index change at the interface between the material constituting the base material 11 and the material adjacent to the protrusion structure 21 becomes moderate, and reflection of the visible region at the interface on the protrusion structure surface can be suppressed.

  It is preferable that the plurality of convex portions constituting the protruding structure 21 are arranged in a lattice shape. When arranged in a lattice shape, a hexagonal close-packed lattice shape is more preferable, but a square lattice shape may also be used. It is preferable that the pitch of the grating structure (arrangement pitch of adjacent convex portions) is smaller than the wavelength band of the visible region, that is, 360 nm or less so that the light in the visible region is not first-order diffracted by the periodicity of the grating structure. Furthermore, it is preferable that the centers of the convex portions constituting the protrusion structure 21 are irregularly distributed with a deviation from the center position (design position) on the periodic structure of the lattice structure, and the deviation of the distribution is larger than the pitch of the lattice structure. A small value is preferable, and a value of 1/5 or less of the pitch of the lattice structure is more preferable.

  The value of the structure height of the plurality of convex portions constituting the protrusion structure 21 is appropriately designed depending on the reflection suppressing effect and the reflection optical characteristics of the surface of the structural color body. The structural height of the convex portion may be constant, but preferably has an irregular distribution in order to impart a scattering effect. However, if the scattering effect is promoted, the monochromaticity of the light reflected from the surface of the structural color body may be impaired. Therefore, the deviation of the structural height is 1/3 or less of the average value of the structural height. It is more preferable. The protruding structure 21 having a distributed structure height can be formed in a lump by, for example, designing the etching mask line width to be distributed and performing dry etching until the mask disappears completely. In this case, the deviation of the mask line width distribution is preferably 1/3 or less of the average value of the mask line width. Further, it is more preferable that the protrusion structure 21 has no flat portion on the bottom surface, but a flat portion may exist. The deviation of the bottom area of the convex portion is more preferably 1/3 or less of the design value. The reason is the same as in the case of the structural height. When the convex portions are arranged in a lattice pattern, the design value can be calculated from the periodicity of the lattice structure. In addition, the bottom area here is an area obtained by vertically viewing a region surrounded by an imaginary line defined by the side surface or bottom surface of another convex portion adjacent to the side surface of the convex portion from above the structural color body. It is. The upper direction corresponds to a direction perpendicular to the lower part of the structural color body in FIG. Even if the convex portion is inclined with respect to the bottom surface of the structural color body, the bottom area is calculated by a value viewed from a direction perpendicular to the bottom surface.

Next, as shown in FIG. 1B, a material having a different refractive index with respect to light in the visible wavelength band is formed on the surface of the protruding structure 21 by a sputtering method, a vapor deposition method, or a self-organization method. The laminated film 31 is formed by applying the above technique. In FIG. 1B, three pairs of two layers of a high refractive index layer 41 and a low refractive index layer 51 are sequentially formed on the surface of the protruding structure 21, but the number of these layers, material types, and the number thereof. The film thickness and the order of lamination are appropriately designed according to the required optical characteristics. As a material constituting the laminated film, for example, by applying a material having a large refractive index difference such as titanium dioxide (TiO ₂ ) as a high refractive index material and SiO ₂ as a low refractive index material, high reflection can be achieved even with a small number of laminated layers. However, even when the refractive index is slightly different, reflection at the interface occurs. Therefore, for example, a polymer material can be applied by appropriately designing the number of layers.

  When the structural color body obtained as described above is irradiated with white light from the surface side of the substrate 11, the light interfered by the laminate 31 is extracted as reflected light from the surface of the structural color body. On the other hand, light in other wavelength bands is transmitted through the laminate 31, but reflection at the interface is suppressed by the protruding structure 21, so that it is hardly extracted from the surface of the structural color body. As a result, only the light interfered by the stacked body 31 is observed with high contrast. Furthermore, the laminate 31 is formed on the surface of the protruding structure 21. In the formation process of each layer, the film is formed while following the surface shape of the adjacent lower layer. Therefore, the laminated body 31 has irregularity in the height direction, and further, a diffraction effect can be imparted by arranging the protruding structures 21 in a lattice shape. Therefore, since the structural color body gives a light spreading effect to the interference caused by the stacked body 31, it is possible to realize a gradual color change depending on the observation angle.

(Second Embodiment)
FIG. 2 is a schematic cross-sectional view of the structural color body according to the second embodiment. First, as shown in FIG. 2A, a concavo-convex structure 61 in which a flat portion exists between the convex portions adjacent to the surface of the substrate 12 is formed. As a material constituting the base material 12, a material that can be processed by applying a known technique such as lithography or dry etching such as Si, SiO ₂ , Cr, and Ta is preferable.

  The shape of the convex portion of the concavo-convex structure 61 is more preferably a needle shape having no flat portion on the upper surface, but as shown in FIG. 2A, the shape having a flat portion on the upper surface may be used, and the side wall angle is It may be vertical. The uneven structure 61 is preferably arranged in a lattice pattern. When arranged in a lattice shape, a hexagonal close-packed lattice shape is more preferable, but a square lattice shape may also be used. The pitch of the grating structure is preferably smaller than the wavelength band of the visible region, that is, 360 nm or less so that the light in the visible region is not first-order diffracted by the periodicity of the grating structure. Furthermore, it is preferable that the center of the convex portion has an irregular distribution with respect to the center of the lattice structure, and the deviation of the distribution is preferably smaller than the pitch of the lattice structure. A value of 5 or less is more preferable.

  The structure height of the protrusions of the concavo-convex structure 61 may be constant, but may have an irregular distribution in order to impart a scattering effect. However, if the scattering effect is promoted, the monochromaticity of the light reflected from the surface of the structural color body may be impaired. Therefore, the deviation of the structural height is 1/3 or less of the average value of the structural height. Is preferred. The protruding structure 21 having a distributed structure height can be formed in a lump by, for example, a design having a distributed etching mask line width and dry etching until the mask disappears completely. In this case, the deviation of the mask line width distribution is preferably 1/3 or less of the average value of the mask line width.

  Next, as shown in FIG. 2 (b), a material that reflects light in the visible wavelength band or absorbs light in the visible wavelength band is absorbed on the substrate 12 on which the concavo-convex structure 61 is formed. A material to be formed is formed by applying a known technique such as a sputtering method or a vapor deposition method to form the curved layer 71, thereby obtaining the protrusion structure 22 that imitates the eye of the eyelid. When the film thickness of the bending layer 71 is formed on a flat surface, the transmittance of light in the visible wavelength band is preferably 20% or less. The curved layer 71 is more preferably formed with a film thickness that eliminates the flat portion between the convex portions. However, since the reflection suppressing effect can be obtained even if the flat portion between the convex portions is present, It may be formed thinner than a film thickness that eliminates the flat portion.

Next, as shown in FIG. 2C, a material having a different refractive index with respect to light in the visible wavelength band is applied to the surface of the protrusion structure 22 on the surface, such as sputtering, vapor deposition, or self-organization. Lamination is performed by applying a known technique to form a laminated film 32. In FIG. 2 (c), three pairs of two types of high refractive index layer 42 and low refractive index layer 52 are sequentially formed on the surface of the protrusion structure 22, but the number of these layers, the type of material and the number thereof, The film thickness and the order of lamination are appropriately designed according to the required optical characteristics. For example, TiO _{2 as} a high refractive index material and SiO ₂ as a low refractive index material can be used as a material constituting the laminated film to obtain a high reflectance even with a small number of laminated layers. However, even when the refractive index is slightly different, reflection at the interface occurs, so that, for example, a polymer material can be applied by appropriately designing the number of layers.

  When the structural color body obtained as described above is irradiated with white light from the surface side of the substrate 12, the light interfered by the laminate 32 is extracted as reflected light from the surface of the structural color body. On the other hand, light in other wavelength bands is transmitted through the laminate 32, but is hardly extracted from the surface of the structural color body because the projection structure 22 suppresses reflection at the interface. As a result, only the light interfered by the stacked body 32 is observed with high contrast. Furthermore, the laminate 32 is formed on the surface of the protruding structure 22. In the formation process of each layer, the film is formed while following the surface shape of the adjacent lower layer. Therefore, the laminated body 32 has irregularities in the height direction, and further, a diffraction effect can be imparted by arranging the protruding structures 22 in a lattice shape. Therefore, since the structural color body has a light spreading effect on the interference caused by the stacked body 32, a gradual color change depending on the observation angle can be realized.

(Third embodiment)
FIG. 3 is a schematic cross-sectional view of a structural color body according to the third embodiment. In the third embodiment, the base material and the concavo-convex structure, or a part forming the concavo-convex structure are made of different materials. First, as shown in FIG. 3A, a structure layer 81 in which a concavo-convex structure 62 in which a flat portion exists between adjacent convex portions is formed on the surface of the base material 13 is formed. In FIG. 3A, the flat surface between the convex portions of the concavo-convex structure 62 exists above the surface of the base material 13, but the flat surface between the convex portions of the concavo-convex structure 62 is the same surface as the surface of the base material 13, Alternatively, it may exist below the surface of the substrate 13. The uneven structure 62 is similar to the uneven structure 61 described in the second embodiment.

  As a method for forming the concavo-convex structure 62 in the structure layer 81, application of the optical nanoimprint method or the thermal nanoimprint method is particularly suitable. In this case, the material constituting the structural layer 81 is a photocurable resin when the optical nanoimprint method is applied, and a thermoplastic resin or a thermosetting resin when the thermal nanoimprint method is applied. Moreover, as a material which comprises the base material 13, what is necessary is just a material with high adhesiveness with a photocurable resin, a thermoplastic resin, or a thermosetting resin, for example, the polyethylene terephthalate film which implemented the easily bonding process Etc. are applicable.

As the optical nanoimprint mold or the thermal nanoimprint mold, for example, a master mold obtained by processing a concavo-convex inverted structure of the concavo-convex structure 62 using a known technique such as lithography or dry etching on a SiO ₂ or Si substrate, or a master mold is used. It is possible to fabricate and apply a replica mold by processing the same structure as the concavo-convex structure 62. Anodization may be applied to the production of the master mold.

  If it is necessary to trim the shape of the concavo-convex structure obtained by applying the optical nanoimprint method or the thermal nanoimprint method, such as the structure height or line width, plasma treatment is performed after the optical nanoimprint or thermal nanoimprint is performed. You can do it.

  Next, as shown in FIG. 2B, a material that reflects light in the visible wavelength band or a material that absorbs light in the visible wavelength band is formed on the structural layer 81 by sputtering or vapor deposition. By applying a known technique such as the above, a film is formed to form the curved layer 72, and the protrusion structure 23 imitating the eye of the eyelid is obtained. When the film thickness of the bending layer 71 is formed on a flat surface, the transmittance of light in the visible wavelength band is preferably 20% or less. The curved layer 72 is more preferably formed with a film thickness that eliminates the flat part between the convex parts. However, since the reflection suppressing effect can be obtained even if the flat part between the convex parts exists, It may be formed thinner than a film thickness that eliminates the flat portion.

Next, as shown in FIG. 2 (c), a material having a different refractive index with respect to light in the visible wavelength band is applied to the surface of the protrusion structure 23 on the surface, such as sputtering, vapor deposition, or self-organization. Lamination is performed by applying a known technique to form a laminated film 33. In FIG. 2C, two pairs of two layers of a high refractive index layer 43 and a low refractive index layer 53 are sequentially formed on the surface of the protruding structure 23. The number of these layers, the type of material, and the number thereof. The film thickness and the order of lamination are appropriately designed according to the required optical characteristics. For example, TiO _{2 as} a high refractive index material and SiO ₂ as a low refractive index material can be used as a material constituting the laminated film to obtain a high reflectance even with a small number of laminated layers. However, even when the refractive index is slightly different, reflection at the interface occurs, so that, for example, a polymer material can be applied by appropriately designing the number of layers.

  When the structural color body obtained as described above is irradiated with white light from the surface side of the substrate 13, the light interfered by the laminate 33 is extracted as reflected light from the surface of the structural color body. On the other hand, light in other wavelength bands is transmitted through the laminate 33, but reflection at the interface is suppressed by the protrusion structure 23, so that it is hardly extracted from the surface of the structural color body. As a result, only the light interfered by the stacked body 33 is observed with high contrast. Further, the stacked body 33 is formed on the surface of the protruding structure 23. In the formation process of each layer, the film is formed while following the surface shape of the adjacent lower layer. Therefore, the stacked body 33 has irregularity in the height direction, and further, a diffraction effect can be imparted by arranging the protruding structures 23 in a lattice shape. Therefore, since the structural color body gives a light spreading effect to the interference caused by the stacked body 33, a gradual color change depending on the observation angle can be realized.

  In addition, as in the first to third embodiments described above, the color structure is manufactured by providing a design in which at least one of the center position, the structure height, and the bottom area of the convex portion is irregular. Even when variations (manufacturing errors) occur between batches at the same time, variations in optical characteristics can be suppressed and yield can be improved.

  First, a mold for optical nanoimprint was prepared. Specifically, since the wavelength of light irradiated in the optical nanoimprint was 365 nm, synthetic quartz that transmits light of this wavelength was used as a material for the mold. Cr was deposited on the surface of the synthetic quartz substrate by sputtering, and an electron beam resist pattern was formed on the electron beam resist applied on the Cr film by electron beam lithography. The electron beam resist used was a positive type, and the film thickness was 150 nm. A pattern drawn by an electron beam has a standard deviation of 15 nm with a square value of 150 nm on a side of a square area of 3 cm in a XY coordinate system, centered on the center coordinates of a square lattice array with a period of 300 nm for both X and Y coordinates. The region in which the electron beam is drawn is a square inner region. Cr in the region where the surface was exposed was etched away by plasma generated by applying a high frequency to a mixed gas of chlorine and oxygen. Subsequently, quartz was etched in a region where the surface was exposed by plasma generated by applying a high frequency to ethane hexafluoride gas. The quartz depth etched by this process was 150 nm. The remaining resist and Cr film were removed, and OPTOOL HD-1100 (manufactured by Daikin Industries) was applied as a release agent to obtain a mold for optical nanoimprint.

Next, a photocurable resin was applied to a synthetic quartz wafer to a thickness of 100 nm, and light of 365 nm was irradiated with 10 J / m ² while pressing a mold for photo nanon printing on the synthetic quartz wafer with a pressure of 50 kN in a vacuum. Subsequently, the mold for photon nanoprinting was released from the synthetic quartz wafer to obtain a synthetic quartz substrate on which a photocurable resin pattern was formed.

Next, the synthetic quartz substrate on which the photocurable resin pattern was formed was exposed to plasma generated by applying a high frequency to oxygen gas, and the residual film generated in the photo nanoimprint process was removed. Subsequently, quartz was etched in a region where the surface was exposed by plasma generated by applying a high frequency to ethane hexafluoride gas. The quartz depth etched by this process was 120 nm. On the surface of the synthetic quartz substrate from which the remaining resist is removed, a 300 nm-thick Al film is formed by vapor deposition, and then 55 nm-thick TiO ₂ and 76 nm-thick SiO ₂ are alternately deposited by five pairs. A film was formed to obtain a structural color body.

  When reflection spectroscopy measurement was performed on the obtained structural color body from the vertical direction, a spectrum having a peak intensity of about 60% at the maximum at about 460 nm was obtained in the region where the structure was formed. Although there was a sharp well at about 500 nm in the region where the structure was not formed, a spectral spectrum showing a reflectance of 80% or more was obtained in other wavelength regions. When the obtained structural color body is tilted in the ± 50 ° region under white light irradiation, the color of the structure forming region is not substantially changed.

  The coloring structure of the present invention can be used for a display with high design properties. In particular, it is expected to be suitably used in the field of surface decoration.

11, 12, 13 ... base material 21, 22, 23 ... projection structure 31, 32, 33 ... laminate 41, 42, 43 ... high refractive index layer 51, 52, 53 ... low refractive index layer 61, 62 ... uneven structure 71, 72 ... curved layer 81 ... structural layer

Claims (10)

A base material, a concavo-convex structure formed of an assembly of a plurality of convex portions formed on the base material surface or the base material, and transmits light of the same wavelength band on the concavo-convex structure, and the wavelength band In a coloring structure having a laminate composed of two or more layers made of materials having different refractive indexes with respect to the light of
The uneven structure is composed of a material that reflects or absorbs light in the wavelength band,
The color-developing structure is characterized in that the concavo-convex structure is composed of an assembly of protrusion structures that imitate the eye of the eyelid. A base material, a concavo-convex structure formed of an assembly of a plurality of convex portions formed on the base material surface or the base material, and transmits light of the same wavelength band on the concavo-convex structure, and the wavelength band In a coloring structure having a laminate composed of two or more layers made of materials having different refractive indexes with respect to the light of
The concavo-convex structure is a concavo-convex structure in which a flat portion exists between the adjacent convex portions,
A color forming structure comprising a layer made of a material that reflects or absorbs light in the wavelength band between the concavo-convex structure and the laminate.   The concavo-convex structure formed on the base material surface or the base material is a lattice structure in which a plurality of the convex portions are arranged in a lattice shape. Coloring structure.   The center of the convex part of the concavo-convex structure is distributed with a deviation smaller than the pitch from the center position determined by the structural period of the lattice-like structure. Coloring structure.   The color development structure according to claim 4, wherein a value of the deviation is 1/5 or less of a pitch of the lattice structure.   The color developing structure according to any one of claims 3 to 5, wherein a pitch of the lattice structure is smaller than a wavelength band of light transmitted through a material constituting the laminated body.   In the uneven structure, the structure height of the protrusions has a distribution having a deviation of 1/3 or less with respect to the average value of the structure heights of the protrusions. The coloring structure according to any one of the above.   8. The color development structure according to claim 3, wherein the uneven structure has a distribution in which a bottom area of the convex portion is a deviation of 1/3 or less of a design value. A substrate, a concavo-convex structure formed on the substrate surface or on the substrate, and a laminate composed of two or more layers on the concavo-convex structure; A method for producing a coloring structure that selectively reflects light of some wavelengths,
An optical nanoprint mold having a lattice structure in which a plurality of recesses are arranged in a lattice pattern on a substrate, wherein a flat portion exists between the adjacent recesses, and the center of the recess is the lattice shape Preparing an optical nanonprint mold distributed with a deviation smaller than the pitch from the center position determined by the structure period of the structure;
Applying a photocurable resin to the substrate;
Transferring the structure formed in the mold to the photocurable resin layer by a photoimprint method to form the concavo-convex structure;
Forming a metal layer that reflects light in the wavelength band on the substrate on which the uneven structure is formed;
Forming a laminate on the metal layer by alternately laminating materials having a different refractive index to the light of the wavelength band and transmitting the light of the wavelength band. A method for producing a coloring structure characterized by the above. A substrate, a concavo-convex structure formed on the substrate surface or on the substrate, and a laminate composed of two or more layers on the concavo-convex structure; A method for producing a coloring structure that selectively reflects light of some wavelengths,
An optical nanoprint mold having a lattice structure in which a plurality of recesses are arranged in a lattice pattern on a substrate, wherein a flat portion exists between the adjacent recesses, and the center of the recess is the lattice shape Providing a thermal nanonprint mold that is distributed with a deviation smaller than the pitch from a center position determined by the structure period of the structure;
Applying a thermoplastic resin or a thermosetting resin to the substrate;
Transferring the structure formed in the mold to the thermoplastic resin layer or the thermosetting resin layer by a thermal imprint method, and forming the concavo-convex structure;
Forming a metal layer that reflects light in the wavelength band on the substrate on which the uneven structure is formed;
Forming a laminate on the metal layer by alternately laminating materials having a different refractive index to the light of the wavelength band and transmitting the light of the wavelength band. A method for producing a coloring structure characterized by the above.