WO2006059686A1 - 反射防止材、光学素子、および表示装置ならびにスタンパの製造方法およびスタンパを用いた反射防止材の製造方法 - Google Patents
反射防止材、光学素子、および表示装置ならびにスタンパの製造方法およびスタンパを用いた反射防止材の製造方法 Download PDFInfo
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- WO2006059686A1 WO2006059686A1 PCT/JP2005/022097 JP2005022097W WO2006059686A1 WO 2006059686 A1 WO2006059686 A1 WO 2006059686A1 JP 2005022097 W JP2005022097 W JP 2005022097W WO 2006059686 A1 WO2006059686 A1 WO 2006059686A1
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- stamper
- fine
- convex
- antireflection
- concavo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/118—Anti-reflection coatings having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/38—Anti-reflection arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
- H01J2211/20—Constructional details
- H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
- H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2329/00—Electron emission display panels, e.g. field emission display panels
- H01J2329/86—Vessels
- H01J2329/89—Optical components structurally combined with the vessel
- H01J2329/892—Anti-reflection, anti-glare, viewing angle and contrast improving means
Definitions
- the present invention relates to an antireflection material excellent in antireflection performance, and an optical element and a display device including the antireflection material.
- the present invention also relates to a method for manufacturing a stamper (also referred to as “metal mold” or “saddle type”), a method for manufacturing an antireflection material using the stamper, and an antireflection material.
- An optical element such as a display device or a camera lens used in a television or a mobile phone is usually provided with an antireflection technique in order to reduce surface reflection and increase light transmission.
- an antireflection technique in order to reduce surface reflection and increase light transmission. For example, when light passes through the interface of a medium with a different refractive index, such as when light enters the interface between air and glass, the amount of transmitted light is reduced due to Fresnel reflection, etc., and visibility decreases. is there.
- Examples of the antireflection technique include a method of providing an antireflection multilayer film on the surface of a substrate, in which a large number of thin films formed of inorganic particles such as silica or organic fine particles such as acrylic are laminated.
- the antireflection multilayer film is usually formed by using a vacuum deposition method or the like, there is a problem that the film formation time is long and the cost is high.
- higher antireflection performance is required in an environment where ambient light is very strong, it is necessary to increase the number of antireflection multilayer films, which further increases costs.
- the antireflection multilayer film uses the light interference phenomenon, the antireflection effect depends greatly on the incident angle and wavelength of light. For this reason, the antireflection effect is significantly reduced when the incident angle or wavelength is out of the design range.
- Patent Document 1 to Patent Document 5 there is a method of forming a fine concavo-convex pattern in which the concavo-convex period is controlled to be equal to or less than the wavelength of visible light on the substrate surface.
- This method uses the principle of the so-called moth-eye structure, and the refractive index of light incident on the substrate is measured along the depth direction of the irregularities. By continuously changing from the refractive index of the substrate to the refractive index of the substrate, reflection in the wavelength region where reflection is desired is suppressed.
- the concavo-convex pattern include cones such as cones and quadrangular pyramids (see Patent Document 3 to Patent Document 5).
- Fig. 11 (a) is a sectional view schematically showing a substrate on which rectangular irregularities are formed
- Fig. 11 (b) is a cross-sectional view schematically showing a substrate on which triangular irregularities are formed. It is.
- FIG. 11 (a) The substrate 1 on which the rectangular unevenness 2 as shown in FIG. 11 (a) is formed produces the same action as the substrate on which the single-layer thin film is formed.
- the concavo-convex pattern as shown in Fig. 11 (b) when the uneven shape is a triangle, the refractive index with respect to the light incident on the substrate changes along the depth direction of the uneven surface. Reduced The
- the concavo-convex pattern as shown in Fig. 11 (b) when the concavo-convex pattern as shown in Fig. 11 (b) is formed, it can exhibit an antireflection effect with a small incident angle dependency over a wide wavelength range as compared with the antireflection multilayer film described above, and many materials. And has an advantage that a concave / convex pattern can be directly formed on a substrate. As a result, a high-performance antireflection material can be provided at a low cost.
- a moth-eye structure is formed by a stamping method, an injection molding method, a casting method, or the like using a stamper (mold or vertical mold) having a surface with a structure in which the fine uneven shape is inverted. It is manufactured by transferring the fine irregular shape of the stamper surface to a light transmissive resin.
- a laser interference exposure method or an electron beam (EB) exposure method has been generally used as a stamper manufacturing method.
- EB electron beam
- Patent Document 6 discloses a method for mass-producing a stamper at low cost using an anodized porous alumina obtained by anodizing aluminum.
- anodized porous alumina obtained by anodizing aluminum will be briefly described.
- a method for producing a porous structure using anodization has attracted attention as a simple method capable of forming regularly arranged nano-order cylindrical pores.
- an acidic electrolytic solution such as sulfuric acid, oxalic acid, or phosphoric acid, or an alkaline electric field solution, and a voltage is applied using the substrate as an anode, oxidation and dissolution proceed simultaneously on the surface of the substrate. It is possible to form an acid film having pores. These cylindrical pores are oriented perpendicular to the oxide film and exhibit self-organized regularity under certain conditions (voltage, type of electrolyte, temperature, etc.). Is expected to be applied.
- the anodized / porous alumina layer 10 is constituted by cells 16 of a certain size having pores 12 and barrier layers 14.
- the shape of the cell 16 when a normal force is seen on the membrane surface is typically a regular hexagon.
- the cells 16 are arranged in the two-dimensionally most densely packed array when viewed from the direction perpendicular to the film surface.
- Each cell 16 has a pore 12 at its center, and the arrangement of the pores 12 has periodicity.
- the arrangement of pores 12 is periodic When viewed from the direction perpendicular to the membrane surface, each of all pores adjacent to the pore from the geometric center of gravity of the pore (hereinafter simply referred to as “center of gravity”).
- the sum of the vectors toward the center of gravity of the vector becomes zero.
- the six centroid forces of one pore 12 toward the centroid of each of the six adjacent pores 12 have the same length, and their directions differ from each other by 60 degrees. The sum of these vectors is zero.
- the vector has periodicity if the sum of the vectors is less than 5% of the total length of the vectors.
- the porous alumina layer 10 is formed on the aluminum layer 18 because it is formed by anodizing the surface of aluminum.
- the cell 16 is formed as a result of local dissolution and growth of the film, and dissolution and growth of the film proceed simultaneously at the bottom of the pores called the barrier layer 14.
- the size of the cell 16 that is, the interval between the adjacent pores 12 corresponds to approximately twice the thickness of the NOR layer 14 and is approximately proportional to the voltage during anodization.
- the diameter of the pore 12 depends on the type, concentration, temperature, etc. of the electrolyte, but is usually the size of the cell 16 (the length of the longest diagonal of the cell 16 when a perpendicular force is seen on the membrane surface) It is known to be about 1Z3.
- pores generated under specific conditions exhibit high regularity, and depending on the conditions, it is possible to form a pore array with irregularity to some extent.
- Patent Document 6 describes, as an example, (1) using anodic acid porous alumina on a Si wafer as a mask and dry etching the Si wafer to form fine irregularities on the surface of the Si wafer.
- a method is disclosed.
- (2) a method is disclosed in which anodized porous alumina is formed on the surface of an A1 plate, and metal A1 is dry etched using the porous alumina as a mask to form fine irregularities on the surface.
- (3) a method is disclosed in which anodized porous alumina is formed on the surface of an A1 plate, the alumina layer is dry-etched to leave a part thereof, and irregularities are formed on the surface.
- Patent Document 1 Special Table 2001-517319
- Patent Document 2 JP 2004-205990 A Patent Document 3: Japanese Patent Application Laid-Open No. 2004-287238
- Patent Document 4 Japanese Patent Laid-Open No. 2001-272505
- Patent Document 5 Japanese Patent Laid-Open No. 2002-286906
- Patent Document 6 Japanese Unexamined Patent Publication No. 2003-43203
- Non-Patent Document 1 Masuda et al., 52nd Joint Conference on Applied Physics, Proceedings (Spring 2005, Saitama University) 30p—ZR—9, p. 1112.
- the regular reflection that is, the antireflection effect for zero-order reflected diffracted light is insufficient.
- the use of anti-reflective materials for mobile displays used outdoors with strong sunlight reduces the visibility significantly.
- the aspect ratio of the unevenness (the ratio of the height to the unevenness period) should be increased.
- the concavo-convex pattern is usually produced by a transfer method using a mold (stamper) from the viewpoint of mass productivity.
- a mold stamper
- the desired antireflection effect cannot be obtained when an antireflection material is produced by the transfer method! / In many cases! ,.
- One of the main objects of the present invention is to generate diffracted light of a short wavelength light component over a wide incident angle.
- An object of the present invention is to provide an antireflective material that can suppress life and can prevent the occurrence of regular reflection, and can exhibit an excellent antireflection effect even if it is produced by a transfer method.
- Another object of the present invention is to provide a stamper manufacturing method that can be suitably used for manufacturing a stamper having a large area or a special shape.
- an object of the present invention is to provide a stamper suitably used for forming an uneven surface structure of an antireflection material using a moth-eye structure, and a manufacturing method thereof.
- the antireflective material of the present invention is an antireflective material formed on the surface of a substrate in the concave and convex pattern force direction and the y direction having a period smaller than the shortest wavelength of incident light, and the shortest wavelength of the incident light Min, the maximum incident angle of the incident light is 0 i
- ⁇ and Ay are collectively expressed as “Ax, y”.
- formula (1) is represented by the following formula (2)
- the coordinate axis in the height direction of the concavo-convex pattern is h-axis
- the differential coefficient (dn (h) Zdh) of the effective refractive index n (h) is expressed by the following eff eff
- the effective refractive index n (h) is expressed by the following formula (5)
- the coordinate axis in the height direction of the concavo-convex pattern is h-axis
- the convex portion of the concave / convex pattern has a stepped side surface.
- An optical element of the present invention includes any of the antireflection materials described above.
- a display device of the present invention includes the optical element described above.
- the stamper manufacturing method of the present invention is a stamper manufacturing method having a fine concavo-convex structure on the surface, and (a) a base material provided with an aluminum layer containing at least 95% by mass of aluminum on the surface is prepared. (B) forming a porous alumina layer having a plurality of fine recesses by partially anodizing the aluminum layer; and (c) converting the porous alumina layer into an alumina etchant. The step of expanding the plurality of fine recesses of the porous alumina layer by contacting the porous alumina layer with the porous alumina layer by alternately performing the steps (b) and (c) a plurality of times.
- a plurality of fine recesses each having a stepped side surface are formed.
- Ti and Z or Si are preferably contained in an amount of 1 to 5% by mass.
- the aluminum layer is made of 99.99 aluminum. It may be contained by mass% or more.
- the last step is the step (b).
- the deepest portion of the plurality of fine recesses is substantially a point.
- the plurality of minute recesses include a minute recess having three or more and six or less minute protrusions formed around.
- the base material further includes a conductive metal layer or semiconductor layer on the base of the aluminum layer.
- a conductive metal layer or semiconductor layer on the base of the aluminum layer.
- the conductive metal platinum (Pt), gold (Au), silver (Ag) and copper (Cu) are preferable. Silicon (Si) is preferred as the conductive semiconductor layer.
- the metal layer is formed of a valve metal.
- Valve metal is a general term for metals that are anodized.
- tantalum (Ta), -ob (Nb), Mo (molybdenum), titanium (Ti), hafnium (Hf), zirconium (Zr), zinc (Zn), tungsten (W), bismuth (Bi), and antimony (Sb) are included.
- tantalum (Ta), niobium (Nb), Mo (molybdenum), titanium (Ti), and tungsten (W) are preferred!
- the high-hardness metal layer is formed so as to cover the porous alumina layer after forming the plurality of fine recesses having the stepped side surfaces in the porous alumina layer. Is further included.
- the method further includes a step of performing a surface treatment after forming the plurality of fine recesses having the stepped side surfaces in the porous alumina layer.
- the base material is columnar or cylindrical, and the surface is an outer peripheral surface of the base material, and the plurality of fine recesses are seamlessly formed on the outer peripheral surface.
- the base material is cylindrical, and the surface is an inner peripheral surface of the base material, and the plurality of minute recesses are seamlessly formed on the inner peripheral surface.
- the substrate has a further concavo-convex structure larger than 780 nm under the aluminum layer.
- the plurality of fine recesses of the fine concavo-convex structure are: The distance between adjacent minute recesses is in the range of lOOnm to 200nm.
- the fine recesses are formed such that the plurality of fine recesses of the fine uneven structure have no periodicity.
- the porous alumina layer in which the plurality of fine recesses each having a stepped side surface are formed, or a transfer product on which a surface structure of the porous alumina layer is transferred is formed. And further including the step of fabricating a metal stamper.
- the method for producing an antireflection material of the present invention is a method for producing an antireflection material using a stamper, the step of producing the stamper by any of the above methods, and the surface of the stamper. And a step of transferring the fine concavo-convex structure.
- the stamper of the present invention is a stamper having a fine concavo-convex structure on a surface, a base material, an aluminum layer provided on the base material and containing at least 95% by mass of aluminum, and the aluminum layer A porous alumina layer provided on the porous alumina layer, wherein the porous alumina layer has a plurality of fine recesses each having a stepped side surface.
- the aluminum layer contains an element other than aluminum, Ti and Z or Si are preferably contained in an amount of 1% by mass to less than 5% by mass.
- the aluminum layer may contain 99.99% by mass or more of aluminum.
- the deepest portion of the plurality of fine recesses is substantially a point.
- the plurality of minute recesses include a minute recess having three or more and six or less minute protrusions formed around.
- the base material further includes a conductive metal layer or semiconductor layer as a base of the aluminum layer.
- the metal layer is made of a valve metal.
- a hard metal layer that covers the porous alumina layer is further provided.
- the fine concavo-convex structure is subjected to a surface treatment.
- the surface treatment is, for example, a mold release treatment that improves transferability.
- the base material is columnar or cylindrical, and the surface is an outer peripheral surface of the base material, and the plurality of minute recesses are seamlessly formed on the outer peripheral surface. It is made.
- the base material is cylindrical
- the surface is an inner peripheral surface of the base material
- the plurality of fine recesses are formed seamlessly on the inner peripheral surface.
- the base material has a further uneven structure larger than 780 nm under the aluminum layer.
- the fine concavo-convex structure exhibits an antireflection function
- the further concavo-convex structure exhibits an antiglare (antiglare) function.
- the plurality of fine recesses of the fine concavo-convex structure have a distance between adjacent fine recesses in the range of lOOnm to 200nm.
- the antireflection material manufactured using this stamper the diffraction of reflected light is suppressed, which is preferable.
- the plurality of fine concave portions of the fine concavo-convex structure are arranged so as not to have periodicity.
- the anti-reflective material manufactured using this stamper the diffraction of the reflected light is suppressed.
- the antireflection film of the present invention is an antireflection material having a fine concavo-convex structure on the surface, and the fine concavo-convex structure includes a plurality of fine protrusions each having a stepped side surface. .
- the plurality of fine concave portions include fine convex portions in which three or more and six or less fine concave portions are formed around.
- a distance between arbitrary convex portions adjacent to each other among the plurality of fine convex portions is P
- the shortest wavelength of incident light is obtained
- the maximum incident angle of the incident light is 0 i
- the formula (1 ') is expressed by the following formula (2,).
- an antireflection material having a small incident angle dependency over a wide wavelength range. Further, according to the present invention, since the occurrence of regular reflection can be sufficiently suppressed, it is possible to provide an antireflection material that can be suitably used for a mobile phone and other mopile equipment that is used in an environment where ambient light is very strong.
- a method for manufacturing a stamper that can be suitably used for manufacturing a stamper having a large area or a special shape (for example, a roll). Since the fine concave portion of the stamper has stepped side surfaces, the specific surface area is widened. As a result, the effect of the surface treatment is strongly obtained.
- an antireflection material having a large area can be easily produced.
- the plurality of fine protrusions of the antireflection material according to the present invention can have stepped side surfaces sufficiently smaller than the wavelength of visible light, the light reflection (0 The following reflection diffraction is unlikely to occur.
- FIG. 1 is a cross-sectional view showing a path when light having a wavelength ⁇ is incident on a substrate on which a fine uneven pattern is formed.
- FIG. 2 (a) is a cross-sectional view showing how zero-order reflected diffracted light and transmitted diffracted light and first-order transmitted diffracted light propagate through an antireflection material, and (b) shows zero-order reflected light. It is sectional drawing which shows a mode that reflected diffracted light and transmitted diffracted light propagate through an antireflection material.
- 3 A perspective view schematically showing a configuration of the antireflection material of embodiment 1 according to the present invention.
- ⁇ 4] (a) is a graph showing the diffraction efficiency of antireflection material I, (b) is a graph showing the diffraction efficiency of antireflection material II, and (c) is the diffraction efficiency of antireflection material ⁇ . It is a graph showing efficiency.
- FIG. 5 (a) is a perspective view schematically showing a configuration of an antireflection material in which a cone is formed on the surface of the substrate, and (b) is a diagram in which a quadrangular pyramid is formed on the surface of the substrate. It is a perspective view which shows the structure of an antireflection material typically.
- (C) is a graph showing the relationship between the effective refractive index n (h) and the height of the unevenness (hZd) in the antireflection material shown in (a) and (b). ) And (efff
- FIG. 6 is a graph showing the relationship between the zero-order reflection diffraction efficiency and the height of the unevenness (dZ ⁇ ) expressed by the relationship with the wavelength ⁇ of incident light in the antireflection material shown in b).
- ⁇ 6] (a) to (e) are perspective views schematically showing the configuration of the antireflection material (structure A to structure E) of Embodiment 3 according to the present invention.
- (B) is a projection of the concavo-convex pattern from structure A to structure E on the xh plane
- (c) is the zero from structure A to structure E.
- 6 is a graph showing the relationship between the next reflection diffraction efficiency and the height of the unevenness (dZ ⁇ ) expressed by the relationship with the wavelength ⁇ of incident light.
- Kama et al. (C) is a perspective view schematically showing the configuration of the antireflection material (structure F to structure H) of Embodiment 4 according to the present invention.
- FIG. 10 (a) is a plan view of the top force of the convex portion in the concavo-convex pattern of structure A shown in FIG. 6 (b), and (b) is the structure F shown in FIG. 8 (a). It is the top view seen from the top of a convex part in this uneven
- (C) is a sectional view taken along cc in (b), and (d) is a sectional view taken along dd in (b).
- FIG. 11 (a) is a cross-sectional view schematically showing a substrate on which rectangular irregularities are formed, and (b) It is sectional drawing which shows typically the board
- FIG. 12 is a diagram schematically showing the structure of a porous alumina layer.
- FIG. 13] (a) to (g) are schematic cross-sectional views for explaining a stamper manufacturing method according to an embodiment of the present invention.
- FIG. 14 (a) and (b) are schematic views showing the shapes of the pores 12a of the porous alumina layer 10a obtained by the stamper manufacturing method according to the embodiment of the present invention.
- FIG. 15 (a) and (b) are schematic views showing the shapes of the pores 12b of the porous alumina layer 10b obtained by the stamper manufacturing method according to the embodiment of the present invention.
- FIG. 16 (a) and (b) are schematic views showing the shapes of the pores 12c of the porous alumina layer 10c obtained by the stamper manufacturing method according to the embodiment of the present invention.
- FIG. 17 (a) and (b) show the porous alumina layer obtained by forming the pores 12a shown in FIG. 14 and then repeating the steps of the oxidation and etching under the same conditions. It is a figure which shows the structure of 10a 'typically.
- FIG. 18 (a) and (b) show the porous alumina layer 10b shown in FIG. 15 and the porous alumina layer 10c shown in FIG. Is a diagram schematically showing the structure of the porous alumina layer 10b ′ and the porous alumina layer 10c ′ obtained by repeating the anodizing step and the etching step until the convex portions become pointed protrusions under the above conditions. is there.
- FIG. 19 is a schematic diagram for explaining a method of forming a concavo-convex structure on the entire outer peripheral surface of a roll-shaped substrate 22a by applying the stamper manufacturing method according to the embodiment of the present invention.
- FIG. 20 is a schematic diagram for explaining a method of forming a concavo-convex structure on the entire inner peripheral surface of a cylindrical base material 22b by applying a stamper manufacturing method according to an embodiment of the present invention.
- FIG. 21 is a view showing an electron micrograph of the concavo-convex structure on the stamper surface of the embodiment of the present invention, where (a) is a front view of the concavo-convex structure, (b) is a perspective view, and (c) is a cross-sectional view. Show.
- FIG. 22 is a diagram showing the results of observing the surface of an antireflection material of an example of the present invention with a scanning electron microscope.
- (A) shows an SEM image of about 63500 times and (b) about 36800 times. .
- FIG. 24 This is a graph showing the spectral reflectance characteristics of regular reflection light of the antireflection material of the example of the present invention.
- (a) is a schematic diagram showing the arrangement of convex portions used in the simulation, and (b) is the shape of the side surface of the convex portion (continuous side with no steps, 10 stepped side surfaces, 5 steps)
- (C) is a graph showing the wavelength dependence of 0th-order diffraction efficiency (reflection efficiency) obtained by simulation.
- the antireflective material of this embodiment is an antireflective material in which concave and convex patterns having a period smaller than the wavelength of incident light are formed on the surface of the substrate.
- the shortest wavelength of incident light is ⁇ min, and the maximum incident light is The incident angle is 0 i, the refractive index of the incident medium is ni, the refractive index of the antireflection material is ns,
- Fig. 1 shows the structure of the antireflection material in which the uneven pattern is arranged one-dimensionally. If a one-dimensional uneven pattern as shown in Fig. 1 is formed !, the difference in refractive index between ⁇ (electric field) mode and ⁇ (magnetic field) mode can be seen. In the case of having a pattern, such a difference is not seen and is isotropic.
- m is the diffraction order (integer of 0, ⁇ 1, ⁇ 2, etc.)
- ⁇ is the wavelength of the incident light
- ⁇ is the period of irregularities
- 6 i is the incident angle
- 0 m is the m-th diffraction angle Represents.
- the diffraction orders are expressed in the order shown in FIG. 1, and ⁇ i and ⁇ m are positive in the direction of the arrows shown in FIG.
- the reflected and transmitted diffracted lights are both higher-order diffracted lights having larger diffraction orders as the wavelength ⁇ of the incident light becomes longer or the period ⁇ of the irregularities becomes shorter. It turns out that it changes into evanescent light (light that does not propagate) in order of force. Therefore, when the period of irregularities is very small compared to the wavelength of incident light, the first-order diffracted light also becomes evanescent light, and zero-order diffracted light (transmitted diffracted light and reflected diffracted light) does not generate any force. Will improve.
- the main factor that decreases the visibility of conventional antireflection materials is mainly short-wavelength light (blue) that propagates to a specific diffraction angle ⁇ m depending on the incident angle ⁇ i. It is considered to be reflected diffraction light of the first order.
- the present inventor determined the above equation (1) as a condition for making all reflected diffracted light such as the first order evanescent light and propagating only zero-order diffracted light (regular reflection).
- the above equation (1) is an equation in which the condition for the propagation of the zero-order diffracted light only for reflection is defined by the relationship between the concave-convex period ⁇ and the wavelength of the incident light, and zero for transmission. Diffracted light other than the following may be generated. The presence of first-order transmitted diffracted light may reduce visibility.
- max ⁇ ni, ns ⁇ means one of rd and ns having a higher refractive index.
- Substitution (8) is derived by substituting.
- the range of visible light to be prevented from force reflection calculated by setting the shortest wavelength of visible light min to 380 nm differs depending on the application to which the antireflection material is applied. In consideration of these, it can be set to an appropriate range.
- the condition for eliminating only the first-order reflected diffracted light is that ⁇ and Ay are both controlled to be less than 200 nm based on the above equation (7).
- the condition for eliminating both the first-order reflected diffracted light and the first-order transmitted diffracted light is that if ⁇ and Ay are both controlled to less than 160 nm based on the above equation (8) Good.
- FIG. 3 is a perspective view schematically showing the configuration of the antireflection material used in the present embodiment.
- a quadrangular pyramid 4 having a period of ⁇ in the X direction and Ay in the y direction is formed on the surface of the substrate 1 as an uneven pattern.
- the height d of the quadrangular pyramid 4 is 380 nm, and the refractive index of the antireflection material 3 on which the quadrangular pyramid 4 is formed is 1.5.
- the antireflection material I is a comparative example in which neither the above formula (1) nor the above formula (2) is satisfied.
- scalar diffraction theory is not adopted in this embodiment because force cannot be applied if the period of the unevenness is sufficiently large compared to the wavelength of incident light.
- the diffraction efficiency based on the vector diffraction theory is calculated based on parameters such as the polarization of incident light, the incident angle, the period of the concavo-convex pattern, and the refractive index of the substrate. For details, refer to, for example, M. G. Moharam: “Coupled Wave Analysis of Two—Dimensional Dielectric Gratings”, SPIE883 (1988), p8-11.
- Figures 4 (a) to (c) show the diffraction efficiencies of antireflection materials ⁇ to ⁇ , respectively.
- the left figure shows the 0th-order and 1st-order diffracted light related to reflection
- the right figure shows the 0th-order and 1st-order diffracted light related to transmission.
- the first-order diffraction efficiency can be suppressed to almost 0% at all incident angles, it means that an excellent antireflection function can be realized over a wide wavelength range.
- the antireflection material of this embodiment is the antireflection material of Embodiment 1 that satisfies the above formula (1), preferably the formula (2), and the coordinate axis in the height direction of the concavo-convex pattern is the h axis,
- the antireflection material of this embodiment the occurrence of regular reflection (zero-order reflection diffraction light) can be sufficiently suppressed.
- the effective refractive index is determined by the occupation ratio (Fill Factor) of the unevenness in the incident medium (for example, air).
- Fill Factor the occupation ratio of the unevenness in the incident medium
- P Lalanne et al. 1, J. Wodern Optics, Vol. 43, No. 10, p. 2063 (1996) can be referred to for calculating the effective refractive index.
- the method of designing the concavo-convex pattern using the effective refractive index is known as a simple method that can almost accurately reproduce the diffraction phenomenon of the concavo-convex pattern, which is difficult to analyze.
- Examples of the uneven shape satisfying the above equation (3) include polygonal pyramids such as a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, and a hexagonal pyramid.
- the polygonal pyramid is composed of a polygonal bottom surface and a side surface formed by connecting one point (vertex) outside the bottom surface to the bottom surface. Depending on the shape of the bottom, it is called a triangular pyramid or a quadrangular pyramid.
- the shape of the side surface is not particularly limited, and may be a polygon such as a triangle as shown in Fig. 6 (a) described later, or a polygon other than those shown in Figs. 6 (b) to (e) described later. Shape may be sufficient.
- the regular antireflection effect of the antireflection material of the present embodiment will be described in detail below with reference to FIGS. Specifically, it is an anti-reflective material with a concave / convex shape of a quadrangular pyramid (example satisfying the above equation (3)) or cone (not satisfying the above equation (3) !, example)! / Then, the effective refractive index and the zero-order reflection diffraction efficiency of both were compared.
- FIG. 5 (a) is a perspective view schematically showing a configuration of an antireflection material in which a cone is formed on the surface of a substrate (not shown), and FIG. 5 (b) is a diagram of the substrate (not shown). 2) is a perspective view schematically showing a configuration of an antireflection material in which a quadrangular pyramid is formed on the surface of FIG.
- the antireflection material shown in FIG. 5 (a) and the antireflection material shown in FIG. 5 (b) differ only in the shape of the unevenness, and the period and height of the uneven pattern are the same.
- the refractive index ns of the antireflection material is 1.5.
- the zero-order reflection diffraction efficiency is calculated from the diffraction efficiency simulation based on the vector diffraction theory described above.
- the height of the concave / convex height (dZ) expressed in relation to the wavelength ⁇ of the incident light is 0.4 to 1.8. Over a range of.
- Fig. 5 (c) shows the effective refractive index
- Fig. 5 (d) shows the zero-order reflection diffraction efficiency.
- the antireflection effect can be enhanced by making the irregular shape a square pyramid (country in the figure) compared to the cone ( ⁇ in the figure).
- the generation of zero-order reflected diffracted light cannot be completely eliminated even if the height of the unevenness represented by (dZ) (hereinafter sometimes referred to as the normalized height) is increased.
- the generation of zero-order reflected diffracted light could be almost eliminated by controlling the standard height to about 1.8. Since ⁇ is set to 550 nm, the height d of the unevenness can be controlled within the range of about 990 nm in order to almost eliminate the zero-order reflected diffracted light.
- the regular reflectance can be suppressed to 0.1% or less even if the standard height expressed by (dZ) is further smaller than the antireflection material of the second embodiment.
- the effective refractive index n (h) of the concavo-convex shape represented by a function of the concavo-convex height h is the concavo-convex expressed by the above formula (5).
- Eff ranges from 0 to d
- the present inventor has found that it is necessary to satisfy the above requirements in order to sufficiently suppress the occurrence of regular reflection, and has arrived at the present invention.
- the antireflection materials shown in FIGS. 6 (a) to 6 (e) are referred to as Structure A to Structure E, respectively.
- the structure A has the same shape as the quadrangular pyramid shown in FIG. 5 (b).
- Fig. 7 (b) shows a projection of the concavo-convex pattern from structure A to structure E onto the xh plane.
- the refractive index of these structures and the period of the concavo-convex pattern are the same as those shown in Fig. 5 (b).
- the structure D ( ⁇ in the figure) has the most excellent antireflection performance among the structures A to E.
- the structure D satisfies the above requirements defined in this embodiment.
- the effective refractive index n (h) is the force that intersects the function N (h) at the above three points, but is not limited to this, and eff eff
- the effective refractive index change rate changes drastically, unlike structures B and C described later.
- regions with a relatively small effective refractive index change rate (tangential slope) are formed in the vicinity of (h / d) O and (hZd).
- Structures other than the structure D are comparative examples in which V and deviation do not satisfy the above-mentioned requirements defined in the present embodiment (see FIG. 7 (a)). These have a region where the change rate of the effective refractive index fluctuates in the range where the height of the unevenness (hZd) is from 0 to d. descend.
- the anti-reflective action in each structure will be described individually.
- Structure B ( ⁇ in Fig. 7 (a)) is a region where the effective refractive index change rate is relatively large ((hZd)
- the antireflection material of this embodiment is the antireflection material of any one of Embodiments 1 to 3 described above.
- the antireflection material that satisfies the above-mentioned requirements defined in Embodiment 3 while satisfying the above formula (3), or the above formula (3) and the following formula An antireflection material satisfying (4) can be obtained.
- the above equation (4) means that the effective refractive index fraction coefficient (tangential slope) represented by the left side is almost the same as the average value of the effective refractive index represented by the right side. In other words, the change in the effective refractive index ⁇ The ratio ( ⁇ Z Ah) is almost constant over the entire range from 0 to d.
- the above requirements are defined from the viewpoint of accurately forming a concavo-convex pattern having an excellent antireflection effect even when produced by a transfer method.
- the concavo-convex pattern is usually produced by a transfer method using a mold.
- the concavo-convex pattern (antireflection material) formed by the transfer method seems to have the bottom of the concave portion and the top of the convex portion shaved.
- the shape is often different.
- the antireflection material has the shape of the structure B or structure C described above, the rate of change of the effective refractive index in the antireflection material increases rapidly in the vicinity of (hZd) O. The prevention performance may be significantly reduced.
- an antireflective material satisfying the above-mentioned requirement defined in Embodiment 3 or the above formula (4) as well as the effective refractive index distribution of the uneven pattern satisfying the above formula (3) even when manufactured by the transfer method is used. It is hoped to provide.
- the effective refractive index and zero-order reflection diffraction efficiency of the concavo-convex antireflection material shown in FIGS. 8 (a) to (c) were compared and examined.
- Figures 8 (a) to 8 (c) show the concavo-convex shape of one period portion of the concavo-convex pattern of each antireflection material.
- the antireflection materials shown in FIGS. 8 (a) to 8 (c) are referred to as the structure F and the structure H, respectively.
- the projection of structure A is shown in Fig. 9 (b).
- the period ( ⁇ and Ay) and refractive index of the concavo-convex pattern in structure F and structure H are the same as in structure A. 200 nm, refractive index ns is 1.5.
- FIG. 10 (a) is a plan view of the concavo-convex pattern of structure A shown in Fig. 6 (a), as viewed from the top of the convex portion
- Fig. 10 (b) shows the structure F shown in Fig. 8 (a). It is the top view seen from the top of a convex part in this uneven
- a cross-sectional view along cc in FIG. 10 (b) is shown in FIG. 10 (c), and a cross-sectional view along dd in FIG.
- FIGS. 10 (b) is shown in FIG. ).
- FIGS. 10 (c) and 10 (d) are cross-sectional views of structure A fabricated in the same manner as structure F.
- Fig. 9 (a) shows the effective refractive index
- Fig. 9 (c) shows the zero-order reflection diffraction efficiency.
- the effective refractive index and zero-order reflection diffraction efficiency of structure A are shown in Figs. 9 (a) and 9 (c).
- structure F and structure G there is no region where the rate of change of the effective refractive index changes drastically as in structure B and structure C described above.
- (h / d ) In the vicinity of O and in the vicinity of (hZd) I, the rate of change of the effective refractive index (tangential slope) is relatively small, and the region is gently formed.
- the effective refractive index is determined by the area ratio between the concavo-convex medium and the incident medium on the xy plane.
- the boundary line often cannot be accurately reproduced, and the boundary line becomes a two-dimensional region having a finite extent, so that the area occupation ratio of the incident medium increases.
- an effective antireflective action can be obtained because the effective refractive index distribution hardly changes even when manufactured by the transfer method.
- the regular reflectance can be made completely zero by setting the height of the unevenness (dZ) to about 1.8.
- the regular reflectance can be made substantially zero by setting the height of the unevenness (dZ) to about 0.8 to 0.9.
- the height of the unevenness (dZ) is about 0.6 to 1. Since the regular reflectance in the range of 3 is 0.1% or less and is lower than that of the structure A, it is excellent in the regular antireflection effect in the region where the unevenness is low.
- the shape of the structure F when it is desired to obtain the highest regular antireflection effect, it is particularly preferable to use the shape of the structure F.
- the shape of the structure H is preferable in consideration of the ease of manufacturing the mold.
- the convex and concave tips In the structure F and the structure G, the convex and concave tips have acute angles, whereas in the structure H, the convex and concave have curved shapes. This is because it is easy to manufacture.
- the interval between any adjacent convex parts (or concave parts) is P, the relation described above for the period ⁇ or period Ay ( ⁇ y) (the above formulas (1) and (2) If the following equations (1 ') and (2') obtained by replacing ⁇ y with ⁇ are satisfied, the same effect can be obtained.
- the interval P between adjacent convex portions (or concave portions) is preferably in the range of lOOnm to 200nm.
- the above-described antireflection film can be produced, for example, by a transfer method using a stamper.
- a method for forming an anodized porous alumina described below is used, a large-area stamper can be manufactured relatively easily.
- a plurality of fine recesses having stepped side surfaces is formed will be described, but a recess having smooth side surfaces can also be formed.
- the inventor has studied a method for manufacturing a stamper that can be suitably used for manufacturing a stamper having a large area or a special shape by using a method for forming an anodized porous alumina.
- Anodized alumina can be formed by a wet process, so it is not necessary to have a vacuum process if the substrate with an aluminum layer can be immersed in an electrolyte or etching solution. There is. Further, if the base material can be immersed in an electrolytic solution or an etching solution, it is difficult to be affected by the shape of the base material, so that a stamper having a special shape such as a roll can be manufactured.
- the (cell wall and barrier layer) are isotropically etched, it is difficult to control the uneven shape. For example, it is difficult to obtain a fine concavo-convex structure having a preferable shape on the surface of the antireflection film.
- a stamper manufacturing method is a stamper manufacturing method having a fine concavo-convex structure on a surface, and (a) an aluminum layer containing at least 95% by mass of aluminum is provided on the surface.
- a step of preparing a substrate ( b ) a step of forming a porous alumina layer having a plurality of fine recesses by partially anodizing the aluminum layer, and (c) a step of forming the porous alumina layer into alumina.
- a step of expanding a plurality of fine recesses of the porous alumina layer by contacting with an etchant of step (b) and (c). Forms a plurality of fine recesses having stepped side surfaces.
- Non-Patent Document 1 discloses that anodized alumina having various shapes was produced by repeating anodization of aluminum and a diameter expansion process.
- an antireflection material having a moth-eye structure is produced using PMMA with a non-bell-shaped tapered pore-shaped alumina as a saddle shape, and the reflectance of this antireflection material is About 1% or less.
- the side surface of the recess formed in the alumina layer described in Non-Patent Document 1 is smooth (continuous) and the force is linear.
- the stamper according to the embodiment of the present invention has a stepped side surface with a fine concave portion, so that the specific surface area is widened.
- the effect of the surface treatment is strongly obtained.
- the transferability is improved by subjecting the stamper surface to a mold release treatment.
- an antifouling effect can be obtained by subjecting the surface of the antireflection material to water / oil repellent treatment (for example, fluorine treatment).
- the antireflective material obtained using this stamper is less prone to light reflection (0th order diffraction) than the antireflective material having the same pitch and height because the fine convex portions have stepped side surfaces. , And have the characteristics.
- the concavo-convex shape of the surface of the stamper means the arrangement period of the plurality of concave portions, the depth of the concave portions, the opening area, and the aspect ratio (the size of the opening) in the concavo-convex structure.
- the ratio is characterized by the ratio of depth to depth).
- the size of the opening of the recess can be expressed by a diameter when approximating a circle having the same area, for example.
- the shape of the concavo-convex structure on the surface of the antireflection material produced by transferring the stamper means the arrangement period of the plurality of bulges in the concavo-convex structure, the height of the bulges, the bottom area, and the false It refers to the shape characterized by the petato ratio (ratio of height to bottom size).
- the size of the bottom surface of the convex portion can be expressed, for example, by the diameter when approximated to a circle having the same area.
- the reason for expressing the shape of the concavo-convex structure as described above is that the direct control in the manufacturing method of the stamper using anodized alumina is the plurality of concave portions (in the antireflection material, the stamper This is because the concave portion is a transferred portion).
- a base material provided with an aluminum layer (A1 layer) 18 on the surface is prepared.
- A1 layer aluminum layer
- the aluminum layer 18 is shown here.
- an insulating material for example, glass
- Valve metal is preferred as the conductive metal.
- Valve metal is a general term for anodized metals.
- tantalum (Ta), niobium (Nb), Mo (molybdenum), titanium (Ti), hafnium (Hf), zirconium (Zr), zinc (Zn), tungsten (W), bismuth (Bi), antimony (Sb) are included.
- tantalum (Ta), niobium (Nb), Mo (molybdenum), titanium (Ti), and tungsten (W) are preferred.
- the semiconductor is preferably silicon (Si). Since semiconductors such as valve metals and Si do not generate bubbles even when they come into contact with the electrolyte during the anodic oxidation process, an oxide film can be formed stably without causing peeling or destruction.
- the A1 layer 18 contains 99.99% by mass or more of aluminum is exemplified, but for example, as described in Patent Document 6, the A1 layer 18 contains an element other than aluminum. But you can. In this case, Ti and Z or Si are preferably contained in an amount of 1% by mass or more and less than 5% by mass. Since Si and Ti are difficult to dissolve in A1, when the A1 layer 18 is formed by vacuum deposition or the like, it acts to suppress A1 crystal grain growth. There is an advantage that you can get 8.
- the A1 layer 18 may be formed by a known method such as a vacuum deposition method or a molten aluminum plating method, or the base material itself may be formed of an aluminum metal.
- the surface of the A1 layer 18 is preferably flattened in advance.
- the surface can be flattened by electropolishing using a mixed solution of perchloric acid and ethanol. This is because the flatness of the surface of the A1 layer 18 affects the formation of pores in the anodized porous alumina.
- a porous alumina layer 10 ′ is formed by subjecting the A1 layer 18 partially (surface portion) to anodization under a predetermined condition.
- anodic oxidation eg, formation voltage, electrolyte type, concentration, and anodic acid soaking time, etc.
- the size of pores, generation density, depth of pores, etc. can be controlled.
- the regularity of the pore arrangement can be controlled by controlling the magnitude of the formation voltage.
- the conditions for obtaining a highly ordered array are (1) anodizing at an appropriate constant voltage unique to the electrolyte and (2) anodizing for a long time. It is known that the combination of electrolyte and chemical voltage at this time is 28V for sulfuric acid, 40V for oxalic acid, and 195V for phosphoric acid.
- the porous alumina layer 10 ′ In the porous alumina layer 10 'produced in the initial stage, the arrangement of pores tends to be disturbed. Therefore, considering reproducibility, the porous alumina layer 10' was formed first as shown in Fig. 13 (c). It is preferable to remove the porous alumina layer 10 '.
- the thickness of the porous alumina layer 10 ′ is preferably 2000 nm or less from the viewpoint of productivity, which is preferably 200 nm or more from the viewpoint of reproducibility.
- FIG. 13 (c) shows an example in which the porous alumina layer 10 ′ is completely removed.
- the porous alumina layer 10 ′ may be partially removed (for example, to a depth with surface force).
- the removal of the porous alumina layer 10 ′ can be performed by a known method, for example, by immersing the porous alumina layer 10 ′ in a phosphoric acid aqueous solution or a chromium phosphoric acid mixed solution for a predetermined time.
- anodization is again performed to form the porous alumina layer 10 having the pores 12.
- the porous alumina layer 10 having the pores 12 is brought into contact with an alumina etchant to etch the pores 12 by enlarging the pores 12 by a predetermined amount.
- an alumina etchant to etch the pores 12 by enlarging the pores 12 by a predetermined amount.
- the amount of etching (ie, the size and depth of the pores 12) can be controlled by adjusting the type of etchant 'concentration and the etching time. For example, it is removed by dipping in a phosphoric acid aqueous solution or chromium phosphoric acid mixed solution for a predetermined time.
- the pores 12 are grown in the depth direction and the porous alumina layer 10 is thickened. To do.
- the growth of the pores 12 also starts the bottom force of the pores 12 that have already been formed, so the side surfaces of the pores 12 are stepped.
- the porous alumina layer 10 is further etched by bringing the porous alumina layer 10 into contact with an alumina etchant, whereby the pore diameter of the pores 12 is further expanded.
- the stamper manufacturing method according to the embodiment of the present invention is suitably used, for example, for manufacturing an antireflection material having a moth-eye structure.
- an antireflection material having a moth-eye structure for example, for manufacturing an antireflection material having a moth-eye structure.
- the uneven shape of the antireflection material having high antireflection performance will be described.
- the antireflective material using the uneven structure is The anti-shooting performance depends on the uneven shape.
- the continuity of effective refractive index change and the height (or aspect ratio) of the refractive index at the interface between the incident medium (air, etc.) and the concavo-convex structure and the interface between the concavo-convex structure and the substrate greatly contribute to antireflection performance. Affect. It is preferable that the interface between the incident medium and the concavo-convex structure and the interface between the concavo-convex structure and the base material is a point, and the area of the contacting portion is preferably small.
- the shape of the unevenness itself, that is, the effective refractive index distribution of the uneven portion also affects the antireflection performance.
- the concave portions or the array of convex portions in the concavo-convex structure have no periodicity.
- Non-periodicity means that if the sum of the vectors from the center of gravity of a pore toward the center of gravity of all the pores adjacent to the pore is 5% or more of the total length of the vector, it is substantially It can be said that it does not have periodicity.
- the period is preferably smaller than the wavelength of light.
- the distance between adjacent concave parts in the antireflection material, the distance between adjacent convex parts
- the distance between adjacent convex parts must be within the range of lOOnm or more and 200nm or less. Suppression of diffraction in the entire visible wavelength range (380 ⁇ ! To 780nm) From the viewpoint of
- the stamper for forming the antireflection material a shape obtained by inverting the desired concavo-convex shape having high antireflection performance by controlling each factor contributing to the antireflection performance as described above, or the shape thereof. If it is made on the surface of the base material,
- a metal stamper for example, Ni stamper
- an antireflection material may be produced by using the transfer method.
- a known technique such as an electrolytic plating method or an electroless plating method can be appropriately used for producing a Ni electrode stamper or the like.
- a shape obtained by inverting a desired concave-convex shape having high antireflection performance on the surface of the base material is produced, it may be used as it is as a stamper for producing the antireflection material. If the strength is insufficient to be used as a stamper as it is, for example, a layer having a high material strength such as Ni or W may be laminated on the surface having an uneven structure.
- the factors important for improving the antireflection performance can be easily controlled.
- the period of the concavo-convex structure that determines whether or not unnecessary diffracted light is generated that is, the pore interval
- the pore interval can be controlled by the formation voltage during anodization.
- it is possible to eliminate generation of unnecessary diffracted light by producing under the condition that disturbs the periodicity of the pores (the condition deviating from the above-described condition for obtaining a film having a high periodicity).
- the depth (aspect ratio) of the concavo-convex structure can be controlled by the amount of fine pores formed by anodization and the amount of etching.
- the pore formation amount (depth) is made larger than the etching amount (opening size)
- a concavo-convex structure with a high aspect ratio is formed.
- the height (depth) of the uneven structure of the antireflection material is most important for improving the antireflection performance.
- the size of the steps (steps and widths) is smaller than the wavelength, even if the arrangement of the pores 12a is periodic, the reflection having the same pitch is required. Diffraction (reflection) of light is less likely to occur than prevention materials.
- FIG. 24 is a schematic diagram showing the arrangement of convex portions used in the simulation, and Fig. 24 (b) shows the shape of the side surfaces of the convex portions (continuous side surface without steps, 1
- FIG. 24 (c) is a graph showing the wavelength dependence of the 0th-order diffraction efficiency (reflection efficiency) obtained by simulation. The simulations were performed on the 10th and 5th stages as well as on the 4th, 6th and 7th stages.
- Fig. 24 (a) square pyramidal projections with a height of 500 ⁇ m and a length force S of 200 m on one side of the square were periodically arranged here.
- the reflective member was examined.
- Figure 24 (c) If the step of the side staircase is sufficiently smaller than the wavelength of visible light (380 nm to 780 nm) so that the force is also reduced, the light reflection (0 next time) Is unlikely to occur.
- the antireflection effect is high when the number of steps on the side is 5 or more (the step is lOOnm or less). Particularly, when the number of steps is 5 to 6, the antireflection effect is high in a wide range of visible light.
- the optimal number of steps is set as appropriate, but the antireflection efficiency is improved by having stepped side surfaces. Furthermore, when the arrangement of the convex portions does not have periodicity, the wavelength dependency of the antireflection efficiency is further lowered, and the antireflection effect can be obtained in a wide range and in a wavelength range.
- the shape of the concavo-convex structure itself can be controlled by adjusting the amount of pore formation and the amount of etching in the anodizing step and the etching step performed a plurality of times.
- the pores 12b having a stepped shape having a gentle step as the depth increases.
- the etching amount can be controlled by the type, temperature, concentration, etching time, etc. of each etching solution.
- the electrolytic solution when no voltage is applied can be used as the etching solution.
- the continuity of the effective refractive index at the interface between the incident medium and the concavo-convex structure and the interface between the concavo-convex structure and the substrate is increased. It is preferable to minimize the area of the touch portion. That is, an antireflection material is produced by a transfer method. In the uneven structure of the stamper for this purpose, it is preferable that the concave portion and the convex portion are both sharp and practically points.
- the etching process is performed after the anodization process. By not doing so, the area of the bottom of the pores can be minimized.
- the sharpened pores 12c can be formed. That is, according to the present embodiment, it is possible to form the pores 12c having a stepped shape having a steep step as the depth increases. The step at the deepest portion of the narrow hole 12c is lower than the step at the previous one, but of course it is not limited to this, and a higher step may be formed.
- FIGS. 17 (a) and 17 (b) after the formation of the pores 12a shown in FIG. 14, the steps of anodizing and etching are repeated under the same conditions (however, the final step is the anode step).
- the porous alumina layer 10a ′ obtained by the oxidation process) is shown.
- the substantially conical pores 12a are enlarged, and the portion farthest from the center of each pore 12a ′ is finally left, and the pointed protrusion ( Vertices).
- FIG. 17 shows an example in which the pores 12a ′ are regularly arranged.
- each of the pores 12a is obtained by repeating the anodizing step and the etching step.
- a pointed protrusion is finally formed at a portion farthest from the center of '.
- the concavo-convex structure produced by this method is characterized by three pointed protrusions (vertical points) around one base point (pore center). ). In addition, there is a depression (buttock) between these vertices.
- FIGS. 18 (a) and 18 (b) show the porous alumina layer 10b shown in FIG. 15 and the porous alumina layer 10c shown in FIG. The anodizing process and the etching process until the convex part becomes a pointed projection (Where the final step is the anodizing step) showing the porous alumina layer 10b 'and the porous alumina layer 10c' obtained by!
- the shape of the collar portion ( ⁇ The depth of the line, etc.) can also be controlled, and the effective refractive index distribution of the concavo-convex area after transfer can be controlled in various ways, and the concave and convex portions can be formed in sharp shapes.
- the pore shape of the anodized porous alumina can be shaped relatively freely. For this reason, it becomes possible to produce a desired uneven shape on the substrate surface. For this reason, it is possible to design a stamper in consideration of a shape change due to curing shrinkage or the like of a transfer resin as well as a stamper having a shape having high antireflection performance.
- an antiglare (antiglare) effect is often required as well as an antireflection effect.
- the anti-glare effect diffuses reflected light due to surface irregularities and reduces the reflection of the light source.
- the surface unevenness having the antiglare effect is sufficiently larger than the wavelength of light, at least larger than 780 nm, and is much larger than the size of the fine uneven structure that exhibits the antireflection effect. Therefore, it is possible to use both the antiglare effect due to the macro uneven structure and the antireflection effect due to the fine uneven structure.
- AGAR antireflection material having both an antiglare effect and an antireflection effect can be produced by transferring to a resin etc. using a stamper produced by this method.
- stamper manufacturing method according to the embodiment of the present invention is basically completed by a wet process, it is possible to form a concavo-convex structure on the surface of a substrate having various shapes.
- a roll-to-roll method with a low cost and high viewpoint power is preferred, and a roll-shaped transfer stamper is generally used.
- a shim thin stamper
- the stamper on the flat plate is fixed in a roll shape.
- seams are formed in the concavo-convex pattern, and continuous transfer cannot be performed in a large area.
- a transfer stamper in which a pattern is formed on the entire side surface of the roll.
- FIG. 19 shows a method of forming a concavo-convex structure on the entire outer peripheral surface of a roll-shaped base material 22a, for example, by applying the stamper manufacturing method described above.
- a roll-shaped (columnar) base material 22a having aluminum on its outer peripheral surface is used as an anode, and it is immersed in an electrolytic solution 32 in an electrolytic bath 30, and a cylindrical cathode 24a so as to surround the outside. And apply voltage from the power supply 40.
- the base material 22a may be an aluminum cylinder of Balta as long as aluminum is exposed on the outermost surface, or may be one in which an aluminum layer is formed on the surface of a roll-shaped base material made of another material.
- the shape of the base material 22a is not limited to a cylindrical shape, and may be a cylindrical shape.
- the cross-sectional shape is not limited to a circle but an ellipse or the like.
- the electrolytic solution 32 during anodization is preferably kept stationary, but in consideration of the shape of the base material 22a, etc. If necessary, the electrolyte solution 32 can be stirred.
- FIG. 20 shows a method of forming a concavo-convex structure on the entire inner peripheral surface of, for example, a cylindrical base material 22b by applying the stamper manufacturing method described above.
- a cylinder made of aluminum of Balta or a cylindrical base material 22b having an aluminum layer on the inner peripheral surface is used as an anode, and a cathode 24b is arranged inside the cylinder 22b to perform positive electrode oxidation.
- a concavo-convex structure is produced on the inner peripheral surface of the substrate using the above-described method.
- the force that can also use this inner peripheral surface as a stamper A Ni electrode stamper that transfers the shape of this inner peripheral surface is prepared by appropriately using a known technique such as an electrolytic plating method or an electroless plating method. This may be used as a stamper.
- an antireflection material can be produced using a known transfer method.
- methods for producing nano-order structures include transfer methods using UV curing and heat (cycle). These use a press method to transfer a pattern (fine concavo-convex structure) from a stamper (mold, mold, master) having a nano-sized fine concavo-convex structure to a photocurable resin or thermoplastic resin. It is.
- the antireflection material can be produced, for example, by sequentially performing the following steps (a) to (e) using a UV curing transfer method.
- a photocurable resin for example, urethane acrylate resin
- ultraviolet light for example, 365 nm ultraviolet light, 10 mW, irradiation for 360 seconds
- porous alumina layer was removed by immersing in 8 mol ZL of phosphoric acid (30 ° C) for 30 minutes (Fig. 13 (c)).
- FIG. 21 shows an electron micrograph of the concavo-convex structure of the stamper surface produced by this method.
- FIG. 21 (a) is a front view of the concavo-convex structure, (b) is a perspective view, and (c) is a sectional view.
- the spacing between adjacent pores of the concavo-convex structure is about 200 nm, and although there is no periodicity, the pores are closely packed.
- the depth of the recess is about 840 nm (the aspect ratio is about 4.2), and the deepest portion of the recess is substantially a point.
- the tip of the convex portion is also sharp and substantially a point.
- positioning of the recessed part was formed in the substantially close-packing arrangement
- the side surface of the minute recess has a stepped shape formed by repeating the multi-step anodic oxidation process and the etching process! /
- a UV-cured resin (urethane acrylate-based resin manufactured by The Inktec Co., Ltd.) film coated on a PET film was pressed against the surface of the resulting stamper having a concavo-convex structure, and UV irradiation (3 65 nm ultraviolet light, 10 mW, irradiation for 360 seconds), an antireflection material composed of a resin film having a concavo-convex structure transferred to the surface was obtained.
- UV irradiation 3 65 nm ultraviolet light, 10 mW, irradiation for 360 seconds
- Fig. 22 shows the results of observation of the surface of the obtained antireflection material with a scanning electron microscope.
- Fig. 22 (a) SEM photo about 63500 times up to ⁇ , and (b) about 36800 times up to ⁇ .
- the side surface of the convex portion to which the concave portion of the stamper is transferred also has a stepped shape.
- Figure 23 shows the spectral reflectance characteristics of specularly reflected light from this antireflective material. The regular reflectance in the visible light region (380 ⁇ ! To 780 ⁇ m) was about 0.5% or less, and no diffracted light was generated.
- an antireflection material capable of preventing the generation of first-order diffracted light and further preventing the generation of zero-order reflected diffracted light can be obtained.
- the antireflection material of the present invention includes optical elements such as a light guide plate, a polarizing plate, a protective plate, and an antireflection plate, a liquid crystal display device including such an optical element, an electochromic display device, an electrophoretic display device, and the like. Wide range of display devices You can use it.
- a manufacturing method of a stamper that is suitably used for manufacturing an antireflection material having a moth-eye structure, a manufacturing method of an antireflection material using the stamper, and an antireflection material.
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- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Surface Treatment Of Optical Elements (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Liquid Crystal (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800415969A CN101088030B (zh) | 2004-12-03 | 2005-12-01 | 抗反射材料、光学元件、显示器件及压模的制造方法和使用了压模的抗反射材料的制造方法 |
JP2006548005A JP4368384B2 (ja) | 2004-12-03 | 2005-12-01 | 反射防止材、光学素子、および表示装置ならびにスタンパの製造方法およびスタンパを用いた反射防止材の製造方法 |
US11/702,583 US7835080B2 (en) | 2004-12-03 | 2007-02-06 | Antireflective member, optical element, display device, method of making stamper and method of making antireflective member using the stamper |
US12/382,896 US8431004B2 (en) | 2004-12-03 | 2009-03-26 | Antireflective member, optical element, display device, method of making stamper and method of making antireflective member using the stamper |
US12/382,897 US8262382B2 (en) | 2004-12-03 | 2009-03-26 | Antireflective member, optical element, display device, method of making stamper and method of making antireflective member using the stamper |
US13/870,251 US9429686B2 (en) | 2004-12-03 | 2013-04-25 | Antireflective member, optical element, display device, method of making stamper and method of making antireflective member using the stamper |
Applications Claiming Priority (4)
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JP2004-350863 | 2004-12-03 | ||
JP2004350863 | 2004-12-03 | ||
JP2005285188 | 2005-09-29 | ||
JP2005-285188 | 2005-09-29 |
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US11/702,583 Continuation US7835080B2 (en) | 2004-12-03 | 2007-02-06 | Antireflective member, optical element, display device, method of making stamper and method of making antireflective member using the stamper |
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WO2006059686A1 true WO2006059686A1 (ja) | 2006-06-08 |
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PCT/JP2005/022097 WO2006059686A1 (ja) | 2004-12-03 | 2005-12-01 | 反射防止材、光学素子、および表示装置ならびにスタンパの製造方法およびスタンパを用いた反射防止材の製造方法 |
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US (4) | US7835080B2 (ja) |
JP (3) | JP4368384B2 (ja) |
KR (2) | KR100898470B1 (ja) |
TW (1) | TWI290233B (ja) |
WO (1) | WO2006059686A1 (ja) |
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US8262382B2 (en) | 2012-09-11 |
US20090252825A1 (en) | 2009-10-08 |
JP4850270B2 (ja) | 2012-01-11 |
US20070159698A1 (en) | 2007-07-12 |
US7835080B2 (en) | 2010-11-16 |
KR20080106595A (ko) | 2008-12-08 |
TWI290233B (en) | 2007-11-21 |
US20130242398A1 (en) | 2013-09-19 |
US8431004B2 (en) | 2013-04-30 |
JP2009166502A (ja) | 2009-07-30 |
KR100898470B1 (ko) | 2009-05-21 |
JPWO2006059686A1 (ja) | 2008-06-05 |
JP2009217278A (ja) | 2009-09-24 |
US9429686B2 (en) | 2016-08-30 |
JP4368415B2 (ja) | 2009-11-18 |
US20090211912A1 (en) | 2009-08-27 |
TW200636278A (en) | 2006-10-16 |
KR100893251B1 (ko) | 2009-04-17 |
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KR20070044017A (ko) | 2007-04-26 |
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