Coating liquid composition and method for manufacturing light control member using the same

Abstract

A coating liquid composition for forming an optical film 12 on a substrate 11, wherein the coating liquid composition contains fine particles, a binder precursor for supplying a binder for fixing the fine particles, and a solvent, and at least one of conditions (i) to (iii) is satisfied. Condition (i): the ratio of the binder to the fine particles is 0.5 or more on a mass basis. Condition (ii): further contains a fine particle adhesion inhibitor for inhibiting adhesion of the fine particles to each other in the optical film. Condition (iii): further contains a dispersant corresponding to at least one selected from the group consisting of an anionic polymer-type dispersant and a high-molecular dispersant.

Description

Technical Field

[0001] This invention relates to coating liquid compositions and to a method for manufacturing light control components using the same. Background Technology

[0002] Light control components comprising a substrate and an optical thin film are widely used. An example of an optical thin film is a low-reflection film that reduces reflected light from the substrate. Examples of substrates include cover glass, lenses, prisms, and transmission-type diffractive optical elements. Light control components include, for example, glass plates with low-reflection films, lenses with low-reflection films, prisms with low-reflection films, and transmission-type diffractive optical elements with low-reflection films.

[0003] To form optical thin films, a coating liquid composition comprising microparticles, a binder precursor, and a solvent is sometimes used. An example of microparticles is silica microparticles. Solid microparticles and hollow microparticles with internal pores are known as microparticles. The binder is generated from the binder precursor, for example by a sol-gel method, after the coating liquid composition has been coated. This binder bonds the microparticles together in the film, and further bonds the microparticles to the substrate, thereby fixing the microparticles in place.

[0004] Patent Document 1 discloses a coating liquid composition comprising hollow microparticles and a binder precursor as a coating liquid composition for forming a low-reflection film. In an embodiment of Patent Document 1, the ratio of binder to hollow microparticles is 0.39 by mass. As in this example, the ratio of microparticles used to impart the desired properties is arguably higher than the binder used to reinforce the material. It should be noted that in the embodiment of Patent Document 1, the coating liquid composition is applied by flow coating.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2023-177176 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In addition to flow coating, known coating methods for coating liquid compositions include spin coating, roll coating, and spray coating. The inventors have recently discovered that optical films coated by spray coating are prone to developing minute defects. One object of the present invention is to provide a coating liquid composition that can suppress the formation of minute defects in optical films even when coated by spray coating.

[0010] Methods for solving problems

[0011] This invention provides a coating liquid composition for forming an optical thin film on a substrate, wherein... The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. The ratio of the binder to the particles is 0.5 or more by mass.

[0012] Furthermore, the present invention provides a coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a particle contact inhibitor that suppresses contact between the particles in the optical film.

[0013] Furthermore, the present invention provides a coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

[0014] That is, the present invention provides a coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the coating liquid composition, at least one of the group consisting of condition (i), condition (ii) and condition (iii) is satisfied.

[0015] Here, condition (i) is that the ratio of the binder to the particles is 0.5 or more by mass, condition (ii) further includes a particle contact inhibitor that inhibits contact between the particles in the optical film, and condition (iii) further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

[0016] Furthermore, the present invention also provides a method for manufacturing an optical control component, comprising coating a coating liquid composition onto a substrate to form an optical thin film on the substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the coating liquid composition, at least one of the group consisting of condition (i), condition (ii), and condition (iii) is satisfied. The coating liquid composition is applied to the substrate by spraying.

[0017] Here, conditions (i), (ii), and (iii) are as described above.

[0018] The present invention also provides a method for manufacturing an optical control component, comprising coating a coating liquid composition onto a substrate to form an optical thin film on the substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the method for manufacturing the coating liquid composition, conditions (a) and (b) are met. The coating liquid composition is applied to the substrate by spraying.

[0019] Here, condition (a) is that in the optical film, the ratio of the binder to the microparticles is less than 0.5 by mass, and condition (b) is that in the spraying process, the distance between the spray nozzle from which the coating liquid composition is sprayed and the substrate is more than 25 mm and less than 35 mm.

[0020] Invention Effects

[0021] According to the present invention, a coating liquid composition suitable for suppressing the generation of minute defects in optical thin films is provided, even when coating is performed by spraying. Additionally, a method for manufacturing an optical control component capable of suppressing the generation of minute defects even when spraying is applied in the film formation of the optical thin film is provided. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view showing an example of a light control component.

[0023] Figure 2 This is a cross-sectional view showing another example of a light control component.

[0024] Figure 3 The results are obtained by observing the optical thin film of Example 2 under a microscope.

[0025] Figure 4 These are the observation results of an example of an optical thin film made in the same manner as in Examples 3-14, observed under a microscope.

[0026] Figure 5 This is the observation result of the optical thin film in Example 15.

[0027] Figure 6 This is an example of the results of observing an optical thin film before plasma treatment using a scanning electron microscope (SEM).

[0028] Figure 7This is an example of the results of observing a plasma-treated optical thin film using SEM. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below, but this description is not intended to limit the invention to the specific embodiments. In this specification, "optical thin film" refers to a film used to adjust the reflection and / or transmission of light. It should be noted that the term "thin" is not intended to limit the thickness of the film, but rather is used because "optical thin film" is more commonly used as a technical term than "optical film." Similarly, the "micro" in "particle" is not intended to limit the size of the "particles" to a specific range.

[0030] In this specification, "light control component" refers to a component that utilizes the properties of optical thin films. "Particle adhesion inhibitor" refers to a substance in an optical thin film that has the function of inhibiting the adhesion between particles. However, a "particle adhesion inhibitor" does not need to completely eliminate the contact between particles; it only needs to mitigate the degree of adhesion. "Polymer-type dispersant" refers to a dispersant with an average molecular weight of 2000 or more. The benchmark for average molecular weight is lower than the general definition of polymer based on convention in the field of dispersants. Surfactants commonly used as leveling agents typically have an average molecular weight of less than 1000, and even if high, less than 2000. All expressions regarding average molecular weight in this specification refer to weight-average molecular weight. Furthermore, "silicon (Si)" is treated as a metallic element according to convention in the field of sol-gel methods. "(Meth)acrylic acid" includes both acrylic acid and methacrylic acid.

[0031] In this specification, "minor defects" refers to discolored areas with a maximum diameter exceeding 20 μm in magnified images observed using a microscope with an objective lens having at least 20x optical magnification. Agglomerates with diameters ranging from 1 μm to several μm may exist within the discolored areas. Figure 3 As shown, the color difference can be locally confirmed when comparing the discolored area with the background color. The evaluation of the number of minor defects, for example, is based on the 50mm... 2Within a rectangular area, several discolored portions with a maximum diameter exceeding 20 μm were counted. It is speculated that such agglomeration occurs when a liquid composition containing particles adheres to the surface of the object, dries along with the agglomeration of these particles, and results in a color difference compared to other areas. In spraying, even if the liquid composition is sprayed only towards the target area (area A), it is unavoidable that the composition adheres outside the sprayed area (area B) due to the nature of the spraying process. This adhesion of the composition outside the sprayed area (area B) is called outward adhesion. For example, it is speculated that even if coating is performed towards area A, some composition will still adhere outwards to area B. If coating is performed before and after this area, but directly towards area B, during the drying process, local deviations occur, causing the outwardly adhered portions to exhibit a color difference in reflected light when observed compared to other areas, thus being visually identified as discolored portions.

[0032] [Coating Liquid Composition]

[0033] In this embodiment, the coating liquid composition comprises at least microparticles, a binder precursor, and a solvent. The coating liquid composition is selected from at least one of the following groups: (i) the binder-to-microparticle ratio is 0.5 or more by mass; (ii) it further comprises a microparticle adhesion inhibitor; and (iii) it further comprises an anionic polymeric dispersant and / or a polymeric dispersant. The materials constituting the coating liquid composition will be described below.

[0034] (particle)

[0035] The particles can be inorganic or organic. Inorganic particles include, for example, oxide particles and halide particles, especially oxide particles. Examples of oxide particles include silica particles, alumina particles, zirconium oxide particles, and titanium dioxide particles. Oxide particles can be oxides containing multiple elements, such as aluminosilicate particles. Halide particles include, for example, chloride particles and fluoride particles. Examples of fluoride particles include magnesium fluoride particles and calcium fluoride particles. Organic particles can be resin particles. Examples of resins contained in resin particles include (meth)acrylic resins, styrene resins, and polyurethane resins. However, when the treatment, represented by plasma irradiation (plasma treatment) described later, is applied to the membrane, inorganic particles are preferred.

[0036] The microparticles can be solid or hollow. Microparticles can contain hollow microparticles. Hollow microparticles are beneficial for reducing the refractive index of optical thin films. Microparticles can contain both solid and hollow microparticles. For reducing the refractive index, hollow microparticles made of silicon dioxide and magnesium fluoride are particularly preferred. Microparticles can be hollow silicon dioxide microparticles.

[0037] The average particle size is, for example, 10–300 nm, 10–200 nm, 10–150 nm, or, depending on the case, 10–100 nm. The average particle size can be in the range of 15–100 nm, further in the range of 20–100 nm, or 30–100 nm. The average particle size can be in the range of 30–80 nm. The average particle size can be determined using a transmission electron microscope or a scanning electron microscope. This determination is performed by averaging the maximum particle size of 50 randomly selected particles. The average particle size described here is based on the so-called primary particle size.

[0038] (Adhesives and their precursors)

[0039] Binders serve to bind microparticles together and adhere them to underlying structures such as substrates. In optical thin films, binders fix the microparticles, improving the film's abrasion resistance. Binders are added as precursors to coating liquid compositions. Binders may contain, for example, oxide components, and more specifically, metal oxide components. The binder precursor supplying the metal oxide component can be a metal alkoxide. The metal oxide component is provided by a method known as the sol-gel process. For example, silanolates provide the silica component through hydrolysis and polycondensation. Metal alkoxides are not limited to silanolates; they can also be aluminum alkoxides, zirconium alkoxides, titanium alkoxides, niobium alkoxides, tantalum alkoxides, etc.

[0040] The binder may contain organic components along with the metal oxide component. The organic components may be derived from metal alkoxides, and more specifically, from organic groups bonded to the metal atoms constituting the metal alkoxide. That is, the binder may be an inorganic-organic composite containing both a metal oxide component and an organic component. For example, a binder that is an inorganic-organic composite can be derived from R… 2 n Si(OR 1 ) 4-n The supply of silanol salts is indicated. Here, R... 1 R is an alkyl group having 1 to 4 carbon atoms. 2 For supplying organic components to the binder, n is 1 or 2, particularly 1. R 2 There are no particular limitations; it can be an aliphatic group, an aromatic group, or it can contain heteroatoms. R 2 It can be a hydrocarbon group with 1 to 10 carbon atoms, particularly an alkyl group with 1 to 10 carbon atoms, and further, an alkyl group with 1 to 4 carbon atoms. A binder called sesquioxane is supplied from a silanolate (trialkoxysilane) with n=1.

[0041] The binder may be supplied from only one precursor or from two or more precursors. An example of a combination of two precursors is an alkyltrialkoxysilane and a tetraalkoxysilane. Here, the number of carbon atoms in the alkyl group is not particularly limited; for example, the alkyl group contained in the alkoxy group is 1 to 4, and for the alkyl group bonded to silicon atoms, it is 1 to 10, particularly 1 to 4. A tetraalkoxysilane corresponds to a compound in the above general formula where n=0.

[0042] Metal alkoxides, such as silanolates, can be included in the coating liquid composition in the form of hydrolysates. The hydrolysates can be partially hydrolyzed. The binder precursor can be a metal alkoxide or its hydrolysates, particularly alkoxysilanes or their hydrolysates.

[0043] (Ratio of microparticles to binder)

[0044] In the following description, the ratio of binder to particles is entirely based on mass. Furthermore, this ratio is calculated based on the composition supplied to the film, not the precursor. Therefore, R in the above general formula, for example... 1 Differences will not have a comparative effect. The ratio of binder to particles is preferably 0.5 or higher. This ratio can be 0.8 or higher, 1.0 or higher, 1.1 or higher, 1.2 or higher, 1.5 or higher, 1.7 or higher, and more preferably 1.8 or higher. Coating compositions with this ratio adjusted to a high level are less prone to producing minute defects associated with particle aggregation in the resulting optical film, even when coated by spraying. There is no particular upper limit to this ratio, and it can be 1000 or less, particularly 100 or less. An example of this ratio is 0.5 or more and 100 or less, or 1.0 or more and 100 or less. However, when a particle adhesion inhibitor or dispersant is mixed in, and when the spray nozzle is appropriately adjusted as described later, the ratio of binder to particles can also be 1 or less, less than 0.5, 0.3 or less, 0.2 or less, and depending on the situation, 0.1 or less. When a particulate adhesion inhibitor or dispersant is mixed in, and when the spray nozzle height is appropriately adjusted, the ratio can be 0.001 or more, 0.005 or more, 0.01 or more, and more preferably 0.03 or more. Examples of this ratio when a particulate adhesion inhibitor or dispersant is mixed in, and when the spray nozzle height is appropriately adjusted, are 0.001 or more and less than 0.5, 0.001 or more and less than 0.2, and more preferably 0.005 or more and less than 0.2.

[0045] (Particulate contact inhibitor)

[0046] In the coating liquid composition, it is preferable to add a particle adhesion inhibitor.

[0047] The particle adhesion inhibitor may, for example, have a boiling point of 300°C or higher, and more particularly, 400°C or higher. The boiling point of the particle adhesion inhibitor is preferably higher than the curing temperature of the binder precursor. The curing temperature of the binder precursor is the highest temperature used in the heating process for generating the binder from the binder precursor. Furthermore, the boiling point of the particle adhesion inhibitor is preferably higher than that of the solvent. When the coating liquid composition contains two or more compounds as solvents, the particle adhesion inhibitor may have a boiling point higher than the boiling point of all the compounds contained as solvents. When the coating liquid composition contains a first solvent and a second solvent, and the boiling point of the second solvent is higher than that of the first solvent, the boiling point of the particle adhesion inhibitor may be higher than that of the second solvent.

[0048] It is speculated that controlling the evaporation of the liquid composition is important in suppressing minute defects. In the above-described manner of the present invention, the liquid composition serving as a precursor to the film contains a particle adhesion inhibitor having a boiling point or thermal decomposition temperature of 300°C or higher and having a particle aggregation inhibition function. After the liquid composition is applied to the surface of the substrate, when removing components other than the cured components such as particles and binders, it is desirable to remove the particle adhesion inhibitor relatively slowly in order to maintain the function of inhibiting particle adhesion. In such a case, it is speculated that even when the liquid composition based on outward adhesion is mixed with the liquid composition based on directional adhesion, deviations in the evaporation of components other than solids are suppressed to an extent that the degree of aggregation cannot be identified or the degree of aggregation inhibition is limited.

[0049] The particle adhesion inhibitor can have a viscosity of 1000 mPa·s or higher, 1200 mPa·s or higher, 1400 mPa·s or higher, 1600 mPa·s or higher, and further, 1800 mPa·s or higher. When the coating composition contains two or more compounds as solvents, the particle adhesion inhibitor can have a viscosity higher than the viscosity of all the compounds contained as solvents. The relatively high viscosity of the particle adhesion inhibitor is particularly useful when coating the coating composition onto curved surfaces. When the coating composition contains a first solvent and a second solvent, and the viscosity of the second solvent is higher than the viscosity of the first solvent, the viscosity of the particle adhesion inhibitor can be higher than the viscosity of the second solvent. It should be noted that the viscosity can be measured at room temperature (25°C) using a vibratory viscometer (e.g., Sekonic, probe: PR-10L, controller: VM-10A). When the particle adhesion inhibitor contains a solvent, the viscosity measurement is performed after removing the solvent.

[0050] Particulate adhesion inhibitors can be polymers, especially thermoplastic polymers. Particulate adhesion inhibitors can also be dispersants.

[0051] (Dispersant)

[0052] In the coating liquid composition, a dispersant preferably added is at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants. The dispersant can function as a particulate adhesion inhibitor. The dispersant can have a boiling point exemplified with respect to particulate adhesion inhibitors. The dispersant can have a viscosity exemplified with respect to particulate adhesion inhibitors.

[0053] Anionic polymeric dispersants possess anionic groups, primarily carboxylate and sulfonate groups. Furthermore, they exhibit a polymeric molecular structure, meaning a molecular structure containing repeating units. Anionic polymeric dispersants can be homopolymers or copolymers. Preferably, the repeating units in anionic polymeric dispersants contain anionic groups.

[0054] Examples of anionic polymeric dispersants include polyacrylates, polystyrene sulfonates, styrene-maleic anhydride copolymers, olefin-maleic anhydride copolymers, acrylamide-acrylate copolymers, alginates, and carboxymethyl cellulose salts. The salts are, for example, alkali metal salts such as sodium and potassium salts. Carboxylic acids derived from maleic anhydride may also exist in the form of sodium salts, etc.

[0055] Polymer dispersants have an average molecular weight of 2000 or higher, which is relatively large compared to low molecular weight dispersants, which are commonly used surfactants, allowing them to effectively target microparticles. The molecular weight of polymer dispersants can be 3000 or higher, 4000 or higher, 5000 or higher, 6000 or higher, 7000 or higher, 8000 or higher, 9000 or higher, and further, 10000 or higher. There is no particular upper limit to the molecular weight; for example, it can be below 200,000, and further, below 100,000. Polymer dispersants can be anionic, nonionic, or cationic, preferably anionic or nonionic.

[0056] Examples of anionic polymeric dispersants are the same as those of anionic polymeric dispersants. Examples of nonionic polymeric dispersants include polyvinyl alcohol, polyethylene glycol, and polyacrylamide. Examples of cationic polymeric dispersants include polyethyleneimine and polyvinylimidazoline.

[0057] (Mixing amount of particulate close contact inhibitors, etc.)

[0058] The mixing amount of particulate adhesion inhibitors or dispersants relative to the particulate matter, on a mass basis, can be 0.4 or more, 0.5 or more, 1 or more, 2 or more, 4 or more, 5 or more, 6 or more, 7 or more, 8 or more, 9 or more, and further, 10 or more. There is no particular upper limit to this ratio, and it can be below 1000, particularly below 100. Examples of this ratio are 0.4 or more but below 100, 0.5 or more but below 100, 1 or more but below 100, 4 or more but below 100, 6 or more but below 100, 8 or more but below 100, and further, 10 or more but below 100.

[0059] Particulate adhesion inhibitors or dispersants, like binders, can maintain the spacing between particles. When a particulate adhesion inhibitor or dispersant is included, the ratio of the total amount of binder to the particulate adhesion inhibitor or dispersant relative to the particles is preferably 0.4 or more. This ratio is also described on a mass basis. This ratio can be 0.5 or more, 0.8 or more, 1.0 or more, 1.1 or more, 1.2 or more, 1.5 or more, 1.7 or more, and more preferably 1.8 or more. There is no particular upper limit to this ratio, and it can be 1000 or less, particularly 100 or less. Examples of this ratio are 0.4 or more but less than 100, 0.5 or more but less than 100, and 1.0 or more but less than 100.

[0060] (solvent)

[0061] The solvent may consist of a single type of solvent, but preferably includes two or more solvents with different boiling points. The solvent may include a first solvent and a second solvent, which are organic solvents, particularly polar organic solvents. The boiling point of the first solvent is preferably 70–150°C, 80–140°C, and more preferably 90–130°C. The boiling point of the second solvent is preferably above 150°C (but not including 150°C), above 165°C, and particularly above 170°C. The boiling point of the second solvent may be below 280°C. An example of the boiling point of the second solvent is 150–280°C. In cases where particulate adhesion inhibitors or dispersants are included, the boiling point of the second solvent may be lower than the boiling point of the particulate adhesion inhibitors or dispersants.

[0062] The ratio of the second solvent to the first solvent is used to express that the first and second solvents can be mixed in a mass ratio of less than 1, 0.8 or less, further less than 0.6, and particularly less than 0.4. The lower limit of this ratio can be 0.03 or more, 0.05 or more, and further more than 0.07. For example, the ratio is 0.03 or more and less than 0.8, 0.05 or more and less than 0.5, and further more than 0.07 or less and less than 0.4. The total amount of solvent is expressed as a ratio to the solid components in the coating liquid composition, and can be in the range of 10 to 50, and further more 20 to 40, based on a mass ratio. These ratios are particularly suitable for coating liquid compositions applied to curved surfaces by spraying.

[0063] As the first and second solvents, a combination of solvents with excellent compatibility can be selected. Such a combination can be easily achieved, for example, by making both the first and second solvents alcohols containing alkoxy groups.

[0064] (Other ingredients)

[0065] The coating liquid composition may further include thickeners, thixotropic agents, surfactants, crosslinking agents, leveling agents, etc. Leveling agents improve the wetting of microparticles. The coating liquid composition may further include surfactants. Surfactants are preferably low molecular weight surfactants, specifically those with an average molecular weight of less than 2000.

[0066] [Optical control components and optical thin films]

[0067] Figure 1 This is a cross-sectional view showing an example of a light control component. The light control component 10 includes a substrate 11 and an optical thin film 12 formed on the substrate 11. The surface of the substrate 11 on which the optical thin film 12 is formed is planar. The substrate 11 is a substrate with two mutually parallel surfaces as its main surfaces. The light control component 10 is, for example, a cover glass of an image display device. The optical thin film 12 is, for example, a low-reflection film.

[0068] Figure 2 This is a cross-sectional view showing another example of a light control component. The light control component 20 includes a substrate 21 and an optical thin film 22 formed on the substrate 21. The surface of the substrate 21 on which the optical thin film 22 is formed is curved. The light control component 20 is, for example, a resin lens. The optical thin film 22 is, for example, a low-reflection film.

[0069] Optical films 12 and 22 can also form multilayer films together with other layers (not shown). In this case, optical films 12 and 22 can also form multilayer optical interference films as layers with a specified thickness and refractive index. Optical films 12 and 22 can be light-transmitting layers that allow light to pass through while protecting the underlying material with relatively low scratch resistance.

[0070] The light control component is not limited to the above and can be various optical components. As the material constituting the substrate, transparent materials such as glass and resin are preferred. In this embodiment, known compositions of glass and types of resin used in light control components can also be used without particular limitation.

[0071] The optical thin film on the light control component is preferably contained in every 50 mm when viewed from above. 2 The area with 5 or fewer defects, 3 or fewer defects, further 1 or fewer defects, and particularly 0 defects. The optical thin film on the light control component is more preferably present in the entire area per 50 mm when viewed from above. 2The number of minute defects is 5 or less, 3 or less, further less than 1, and especially 0. In optical thin films, every 50 mm... 2 The number of minute defects can be obtained, for example, by counting the number of discolored portions in the obtained image using a metal microscope with magnification of 20 to 500x, a confocal microscope (with a laser or white light source), or a stereomicroscope. The discolored portions that can be counted using the above counting method have a maximum diameter exceeding 20 μm. In the detection of minute defects, a confocal microscope equipped with an objective lens of at least 20x (nominal value) can be used for the detection and counting of minute defects. In this case, the field of view projected onto the observation monitor can be, for example, H × V = (500 μm to 1500 μm) × (500 μm to 1500 μm). Here, H is, for example, the horizontal direction (lateral), and V is, for example, the vertical direction (longitudinal).

[0072] The appropriate range of refractive index for an optical thin film varies depending on the type of optical control component, the type of substrate, and the required function of the optical thin film. For example, a single-layer low-reflection film formed directly on a substrate can have a refractive index of 1.4 or less, 1.38 or less, further 1.35 or less, 1.3 or less, 1.25 or less, and depending on the situation, 1.2 or less. The lower limit of the refractive index is not particularly limited, but for example, it is 1.07 or more. Here, the refractive index can be determined by the method described in the Examples section. The appropriate thickness of the optical thin film also varies depending on the factors mentioned above. For example, a single-layer low-reflection film formed directly on a substrate can have a thickness of 50 nm to 350 nm, further 80 nm to 200 nm. It should be noted that, unless otherwise specified, the refractive index in this specification refers to the refractive index at a wavelength of 550 nm.

[0073] In the light control components 10 and 20, substrates 11 and 21 are directly contacted with optical films 12 and 22, but this is not a limitation; other films may be sandwiched between the substrate and the optical films. Furthermore, the surfaces of optical films 12 and 22 are exposed. However, this is not a limitation; the surfaces of the optical films may also be covered by other layers. The optical film is not limited to the single-layer film shown in the figure, but may also be a layer constituting a multilayer film. In the case where it is a layer constituting a multilayer film, the optical film's function of adjusting light reflection and / or transmission works in conjunction with the other layers constituting the multilayer film.

[0074] [Manufacturing method for optical control components]

[0075] The coating liquid composition of this embodiment can be supplied to various coating processes and is suitable for coating by spraying. Therefore, the method for manufacturing the light control component of this embodiment includes applying the above-described coating liquid composition onto a substrate by spraying. Spraying is a known coating process in which the coating liquid composition is sprayed from a spray nozzle.

[0076] In optical films formed by spray coating a composition comprising microparticles, a binder precursor, and a solvent, micro-defects are more likely to occur compared to optical films formed by other coating processes. One possible reason for this is the adhesion of aggregated microparticles. By using the aforementioned coating composition, the generation of micro-defects is reduced, and may even be eliminated depending on the situation. Spray coating itself is a coating method with excellent mass production capabilities, capable of handling curved surfaces, and is also a coating process that can continuously form films on multiple substrates. The manufacturing method of this embodiment is highly valuable in terms of its ability to improve the quality of optical films through spray coating.

[0077] The spray nozzle used in the coating process can be a single-fluid spray nozzle that sprays a fluid composed of a coating liquid composition, or a two-fluid spray nozzle that sprays a mixture of a carrier gas such as air and the coating liquid composition. When using a two-fluid spray nozzle, it can be a typical two-fluid spray nozzle that generates a straight flow of the mixed fluid, or it can be a two-fluid spray nozzle that generates a swirling flow of the mixed fluid. Examples of two-fluid spray nozzles that generate a swirling flow of the mixed fluid include those using an annular liquid film microparticle formation method.

[0078] The coating pattern of the coating liquid composition in spraying is not particularly limited. Spraying is performed, for example, in the following manner: the substrate is arranged horizontally so that the surface to be coated with the coating liquid composition (coating surface), and the spray nozzle is positioned vertically above the coating surface of the substrate so that the fluid flow containing the coating liquid composition is directed vertically downwards. The distance between the nozzle outlet and the coating surface of the substrate (spray nozzle ejection height) is preferably 25 mm to 35 mm, more preferably 28 mm to 32 mm. When using such a spray nozzle ejection height, the flow rate of the coating liquid composition sprayed from the spray nozzle is preferably 0.1 ml / min to 0.3 ml / min, more preferably 0.15 ml / min to 0.25 ml / min. When using such a spray nozzle ejection height, the coating liquid composition may or may not contain particulate adhesion inhibitors or dispersants. It should be noted that when using a dual-fluid spray nozzle, the flow rate of the liquid composition is set as follows: with the supply air flow rate at 0, the liquid composition is sprayed for 10 minutes and then recovered, and its volume is measured to calculate the spray volume per unit time (1 minute).

[0079] That is, the manufacturing method of the light control component in this embodiment can also make the following conditions (a) and (b) true.

[0080] Condition (a): In optical films, the ratio of binder to particles is less than 0.5 by mass.

[0081] Condition (b): During spraying, the distance between the spray nozzle from which the coating liquid composition is sprayed and the substrate is more than 25 mm and less than 35 mm.

[0082] In addition to the conditions (a) and (b) described above, the manufacturing method of the light control component in this embodiment may also make the following condition (c) true.

[0083] Condition (c): The flow rate of the coating liquid composition sprayed from the spray nozzle is more than 0.1 ml / min and less than 0.3 ml / min.

[0084] In the manufacturing method of the light control component in this embodiment, the spray nozzle can be a two-fluid spray nozzle, specifically, it can be a two-fluid spray nozzle that generates a swirling flow of mixed fluid, and more specifically, it can be a two-fluid spray nozzle with an annular liquid film microparticle method.

[0085] The method for manufacturing the light control component according to this embodiment can be applied to both manufacturing a single light control component and continuously manufacturing multiple light control components. As an example of continuously manufacturing multiple light control components, a manufacturing method can be described in which multiple substrates are continuously conveyed along a conveying direction at predetermined intervals, while a coating liquid composition is sprayed onto the substrates by spraying. The multiple substrates can be arranged in one row or multiple rows along the conveying direction.

[0086] In a coating liquid composition applied to a substrate, an adhesive is generated from an adhesive precursor to form an optical thin film. Particulate adhesion inhibitors or dispersants contained in the formed optical thin film can be at least partially removed thereafter. Specifically, the removal of particulate adhesion inhibitors or dispersants can be carried out by various treatments of the optical thin film. Examples of such treatments include plasma treatment, corona treatment, UV cleaning, high-temperature treatment, organic cleaning, acid cleaning, and alkaline cleaning. Plasma treatment can be carried out by irradiating oxidizing reactive species, such as oxygen plasma.

[0087] As explained above, the following technologies are provided through this embodiment.

[0088] (Technology 1)

[0089] A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. The ratio of the binder to the particles is 0.5 or more by mass.

[0090] (Technology 2)

[0091] According to the coating liquid composition of Technique 1, the ratio is 1.2 or more by mass.

[0092] (Technology 3)

[0093] A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a particle adhesion inhibitor that suppresses the close contact between the particles in the optical film.

[0094] (Technology 4)

[0095] According to the coating liquid composition of Technique 3, the particulate adhesion inhibitor has a boiling point of 300°C or higher.

[0096] (Technology 5)

[0097] According to the coating liquid composition of technique 3 or 4, the boiling point of the particle adhesion inhibitor is higher than that of the solvent.

[0098] (Technology 6)

[0099] According to any one of techniques 3 to 5, the coating liquid composition wherein the viscosity of the particle adhesion inhibitor is higher than that of the solvent.

[0100] (Technology 7)

[0101] According to any one of techniques 3 to 6, the coating liquid composition wherein the particle adhesion inhibitor is a thermoplastic polymer.

[0102] (Technology 8)

[0103] A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

[0104] (Technology 9)

[0105] According to the coating liquid composition of Technique 8, wherein the anionic polymeric dispersant contains anionic groups in the repeating units.

[0106] (Technology 10)

[0107] According to any one of the techniques 3 to 9, the coating liquid composition wherein the total amount of the binder and the particle adhesion inhibitor or the dispersant relative to the particles is 0.4 or more on a mass basis.

[0108] (Technology 11)

[0109] According to any one of the techniques 3 to 10, the coating liquid composition wherein the ratio of the particle adhesion inhibitor or the dispersant to the particles is 0.4 or more on a mass basis.

[0110] (Technology 12)

[0111] The coating liquid composition according to any one of techniques 1 to 11, wherein the microparticles comprise hollow microparticles.

[0112] (Technology 13)

[0113] According to any one of techniques 1 to 12, the coating liquid composition wherein the precursor comprises at least one selected from the group consisting of alkoxysilanes and hydrolysates of alkoxysilanes.

[0114] (Technology 14)

[0115] The coating liquid composition according to any one of techniques 1 to 13 is a liquid composition for spraying.

[0116] (Technology 15)

[0117] The coating liquid composition according to any one of techniques 1 to 14, wherein, The solvent comprises a first solvent and a second solvent. The boiling point of the second solvent is higher than that of the first solvent.

[0118] (Technology 16)

[0119] According to the coating liquid composition of Technique 15, the ratio of the second solvent to the first solvent is 0.8 or less by mass.

[0120] (Technology 17)

[0121] A method for manufacturing an optical control component includes coating a coating liquid composition onto a substrate to form an optical thin film on the substrate, wherein... The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the coating liquid composition, at least one of the group consisting of condition (i), condition (ii), and condition (iii) is satisfied. The coating liquid composition is applied to the substrate by spraying.

[0122] Here, condition (i) is that the ratio of the binder to the particles is 0.5 or more by mass, condition (ii) further includes a particle adhesion inhibitor that inhibits direct contact between the particles in the optical film, and condition (iii) further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

[0123] (Technology 18)

[0124] According to the manufacturing method of the light control component of Technology 17, wherein, In the coating liquid composition, at least condition (ii) or condition (iii) is met. The method further includes performing a treatment on the optical film to remove at least a portion of the particle adhesion inhibitor or the dispersant.

[0125] (Technology 19)

[0126] According to the manufacturing method of the light control component of Technique 18, the process includes plasma irradiation.

[0127] (Technology 20)

[0128] A method for manufacturing an optical control component according to any one of techniques 17 to 19, wherein the optical thin film is a low-reflection film with a refractive index of 1.4 or less.

[0129] (Technology 21)

[0130] According to the manufacturing method of the light control component of technology 20, the optical thin film is a low-reflection film with a refractive index of 1.2 or less.

[0131] (Technology 22)

[0132] A method for manufacturing a light control component according to any one of techniques 17 to 21, wherein the substrate has a curved surface, and the coating liquid composition is coated on the curved surface.

[0133] (Technology 23)

[0134] A method for manufacturing an optical control component includes coating a coating liquid composition onto a substrate to form an optical thin film on the substrate, wherein... The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the method for manufacturing the coating liquid composition, conditions (a) and (b) are met. The coating liquid composition is applied to the substrate by spraying.

[0135] Here, condition (a) is that in the optical film, the ratio of the binder to the microparticles is less than 0.5 by mass, and condition (b) is that in the spraying process, the distance between the spray nozzle from which the coating liquid composition is sprayed and the substrate is more than 25 mm and less than 35 mm.

[0136] (Technology 24)

[0137] According to the manufacturing method of the light control component of technology 23, in the manufacturing method of the coating liquid composition, further condition (c) is met.

[0138] Here, condition (c) refers to a flow rate of the coating liquid composition sprayed from the spray nozzle that is more than 0.1 ml / min and less than 0.3 ml / min.

[0139] (Technology 25)

[0140] According to the manufacturing method of the light control component of technology 23 or 24, the spray nozzle is a dual-fluid spray nozzle.

[0141] (Technology 26)

[0142] According to the manufacturing method of the light control component of the technology 25, the dual-fluid spray nozzle is a dual-fluid spray nozzle that generates a swirling flow of a mixed fluid of the coating liquid composition and the carrier gas.

[0143] (Technology 27)

[0144] According to the manufacturing method of the light control component of technology 26, the dual-fluid spray nozzle is a dual-fluid spray nozzle with an annular liquid film microparticle atomization method.

[0145] (Technology 28)

[0146] An optical thin film, which is an optical thin film on a light control component, wherein, The optical film comprises microparticles and a binder that fixes the microparticles. The ratio of the binder to the particles is less than 0.5 by mass. When the optical film is observed at a magnification of 20x to 500x, the optical film contains per 50mm 2 The area under observation is defined as having fewer than 5 minor defects.

[0147] (Technology 29)

[0148] An optical thin film, which is an optical thin film on a light control component, wherein, The optical film comprises microparticles and a binder that fixes the microparticles. The ratio of the binder to the particles is 0.5 or more by mass.

[0149] (Technology 30)

[0150] An optical thin film, which is an optical thin film on a light control component, wherein, The optical film comprises microparticles and a binder that fixes the microparticles. It further includes a particle adhesion inhibitor that suppresses the close contact between the particles in the optical film.

[0151] (Technology 31)

[0152] An optical thin film, which is an optical thin film on a light control component, wherein, The optical film comprises microparticles and a binder that fixes the microparticles. It further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

[0153] Example

[0154] [Examples 1 to 15]

[0155] (Membrane formation)

[0156] A binder mixture was prepared by mixing tetraalkoxysilane (TEOS), methyltriethoxysilane (MTES), and 0.3% formic acid in a mass ratio of 8.7:3.7:7.6. This mixture was then combined with microparticles, a dispersant, a leveling agent, a low-boiling-point solvent, and a high-boiling-point solvent to obtain a coating liquid composition. The coating liquid compositions were mixed in the mass ratios shown in Table 1 for the raw materials and in the mass ratios shown in Table 2 for the resulting films. In Table 2, TEOS and MTES, as binder precursors, were used in binder form, i.e., converted to SiO2 and CH3SiO2, respectively. 1.5 To express.

[0157] Next, the coating liquid composition was applied to the surface of the glass plate by spraying. A two-fluid spray nozzle (manufactured by Shimadza Appli Co., Ltd.) with an annular liquid film microparticle atomization method was used as the spray nozzle. The glass plate coated with the coating liquid composition was then allowed to air dry for 10 minutes, followed by heating in an oven set to 200°C for 10 minutes to obtain a low-reflection film as an optical thin film. The thickness of the formed low-reflection film was in the range of 50 nm to 350 nm. The raw materials used are described below.

[0158] • Microparticles: Hollow silica microparticles, Balloon Sil (registered trademark), Nano (manufactured by Toyota Chemical, average particle size 40nm)

[0159] • Binder precursor 1: Tetraalkoxysilane (TEOS), tetraethyl orthosilicate (manufactured by Tama Chemical Industry Co., Ltd.)

[0160] • Binder precursor 2: Methyltriethoxysilane (MTES), KBE-13 (manufactured by Shin-Etsu Silicon Co., Ltd.)

[0161] • Particulate contact inhibitors (dispersants) are listed below A to L: A: Polyethylene glycol 400 (Fujifilm and photoresist) B: Polyethylene glycol 600 (Fujifilm and photoresist) C: Polyethylene glycol 1000 (Fujifilm and photoresist) D: Styrene-maleic anhydride copolymer BYK-2013 (manufactured by BYK) E: Solution of block copolymer with basic pigment affinity groups, BYK-2150 (manufactured by BYK) F: Hyperbranched polyester BYK-2152 (manufactured by BYK) G: Acrylic polymer POLYFLOW No. 36 (manufactured by Kyoei Chemicals) H: Acrylic polymer POLYFLOW No. 99C (manufactured by Kyoei Chemicals) I: Acrylic copolymer FLOWLEN DOPA-35 (Kyoei Chemicals) J: FLOWLEN DOPA-100, a mixture of nonionic surfactant and polycarboxylic acid (manufactured by Kyoei Chemicals). K: Polycarboxylate FLOWLEN G-700 (Kyoei Chemicals) L: FLOWLEN G-1500, a modified product containing carboxylic acid copolymer (manufactured by Kyoei Chemicals). • Low-boiling-point solvent: 1M2P (1-methoxy-2-propanol), boiling point 120°C, (manufactured by Tokyo Chemical Industry) • High-boiling-point solvent: 3M3M1B (3-methoxy-3-methyl-1-butanol), boiling point 174°C, (manufactured by Tokyo Chemical Industry) Leveling agent: Polyether modified silicone, KP-341 (manufactured by Shin-Etsu Silicones Co., Ltd.) For Examples 1 to 15, the spraying conditions are all set to A of the following coating conditions A to D.

[0162] <Coating Condition A>

[0163] Spray nozzle spray height: 60mm; coating liquid composition flow rate: 0.2ml / min.

[0164] <Coating Condition B>

[0165] Spray nozzle spray height: 30mm; coating liquid composition flow rate: 0.2ml / min.

[0166] <Coating Condition C>

[0167] Spray nozzle spray height: 10mm; coating liquid composition flow rate: 0.2ml / min.

[0168] <Coating Condition D>

[0169] Spray nozzle spray height: 30mm; coating liquid composition flow rate: 0.4ml / min.

[0170] It should be noted that the average molecular weight of D, F, K, and L mentioned above is at least 2000 or higher. Additionally, KP-341 (polyether-modified silicone) is a suitable surfactant for use as a leveling agent, with an average molecular weight of less than 2000.

[0171] [Table 1]

[0172] Liquid composition

[0173] [Table 2]

[0174] Membrane composition

[0175] (Determination of refractive index)

[0176] In the refractive index measurement, for Examples 1-15, the film formed in the same manner as described above was used as the substrate, except that a silicon wafer was used. In the refractive index measurement, the spectral reflectance in the visible light region of the film was measured using an Olympus USPM. Based on this spectral reflectance data, the film structure was simulated and fitted using optical film design software (HULINX TFCalc, Inc.), thereby obtaining the refractive index. Regarding the films obtained in Examples 3-14, plasma treatment was applied under the following conditions, and the refractive index was measured before and after treatment.

[0177] Plasma treatment

[0178] The substrate with the film is placed in the chamber of a vacuum plasma apparatus (PIB-20 manufactured by Vacuum Device Co., Ltd.). After evacuation, the flow ratio of argon to oxygen is set to 1:1. The plasma is applied to the film surface by discharging at an atmospheric pressure of 50 Pa and a discharge charge of 30 mA for 90 seconds.

[0179] (Defect determination)

[0180] For Examples 1-15, films were fabricated using cyclic olefin resin lenses as the substrate, in the same manner as described above, and the number of defects was measured. The film was formed on the concave surface of the lens. The number of defects was measured by counting the defects in the obtained image using a confocal microscope (Lasertec OPTELICS HYBRID L7 laser microscope; xenon white light source; objective magnification = ×20; field of view H×V = 750μm × 750μm (observation magnification on the monitor = 370x)). The observation area of ​​the stereo microscope was 50 mm². 2 The measurement results of Example 2 are shown below. Figure 3 One of the measurement results from Examples 3 to 14 is shown below. Figure 4 The measurement results of Example 15 are shown in Figure 5 .

[0181] In Examples 3-14, the generation of defects was suppressed. The decrease in refractive index caused by plasma treatment in Examples 3-14 sometimes reached 0.1 or more. For example, a film with a refractive index of 1.27 became a film with a refractive index of 1.16 after plasma treatment. After plasma treatment, the defects in Examples 3-14 were also substantially the same. On the other hand, in Example 15, where the binder / particle ratio was appropriately adjusted, the generation of defects was eliminated.

[0182] The changes in the membranes of Examples 3-14 before and after plasma treatment were observed using SEM. One example is shown below. Figure 6 (before processing) and Figure 7 (After processing). It can be confirmed that the increase in porosity in the film leads to a decrease in refractive index.

[0183] [Examples 16~18]

[0184] (Membrane formation)

[0185] The spraying conditions are shown in Table 3. For Examples 16-18, any one of B-D is used. Otherwise, the low-reflection film is formed from the coating liquid composition in the same way as in Example 2.

[0186] [Table 3]

[0187] Liquid composition

[0188] For Examples 16-18, the refractive index and defects were measured in the same manner as in Examples 1-15. Furthermore, color unevenness was observed as follows.

[0189] (Confirmation of whether uneven coloring has occurred)

[0190] During defect determination, visual inspection of the obtained images confirms color unevenness of the optical film. Cases where no color unevenness is observed are marked as ○, and cases where color unevenness is observed are marked as ×.

[0191] [Table 4]

[0192] Membrane composition

[0193] In Examples 17 and 18, where the spray nozzle height was appropriately adjusted, the generation of defects was suppressed. In Example 18, where the flow rate of the coating liquid composition was also appropriately adjusted, no color unevenness occurred. In Example 17, where the flow rate of the coating liquid composition was not appropriately adjusted, the optical film was formed thicker in the central portion of the concave surface of the substrate (concave lens) than in other portions, resulting in color unevenness. On the other hand, in Examples 2 and 16, where the spray nozzle height was not appropriately adjusted, the generation of defects could not be suppressed. It should be noted that in Examples 1 to 15, no color unevenness occurred.

Claims

1. A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. The ratio of the binder to the particles is 0.5 or more by mass.

2. The coating liquid composition according to claim 1, wherein, The ratio is 1.2 or higher based on mass.

3. A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a particle adhesion inhibitor that suppresses the close contact between the particles in the optical film.

4. The coating liquid composition according to claim 3, wherein, The particle close contact inhibitor has a boiling point of over 300°C.

5. The coating liquid composition according to claim 3, wherein, The boiling point of the particle adhesion inhibitor is higher than that of the solvent.

6. The coating liquid composition according to claim 3, wherein, The viscosity of the particle adhesion inhibitor is higher than that of the solvent.

7. The coating liquid composition according to claim 3, wherein, The particle adhesion inhibitor is a thermoplastic polymer.

8. A coating liquid composition for forming an optical thin film on a substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. It further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

9. The coating liquid composition according to claim 8, wherein, The anionic polymeric dispersant contains anionic groups in its repeating units.

10. The coating liquid composition according to claim 3 or 8, wherein, The ratio of the combined amount of the binder and the particle adhesion inhibitor or the dispersant to the particles is 0.4 or more on a mass basis.

11. The coating liquid composition according to claim 3 or 8, wherein, The ratio of the microparticle close-contact inhibitor or the dispersant to the microparticles is 0.4 or more on a mass basis.

12. The coating liquid composition according to any one of claims 1, 3, and 8, wherein, The particles include hollow particles.

13. The coating liquid composition according to any one of claims 1, 3, and 8, wherein, The precursor comprises at least one selected from the group consisting of alkoxysilanes and hydrolysates of alkoxysilanes.

14. The coating liquid composition according to any one of claims 1, 3 and 8, wherein it is a liquid composition for spraying.

15. The coating liquid composition according to any one of claims 1, 3, and 8, wherein, The solvent comprises a first solvent and a second solvent. The boiling point of the second solvent is higher than that of the first solvent.

16. The coating liquid composition according to claim 15, wherein, The ratio of the second solvent to the first solvent is 0.8 or less by mass.

17. A method for manufacturing an optical control component, comprising coating a coating liquid composition onto a substrate to form an optical thin film on the substrate, wherein, The coating liquid composition comprises microparticles, an adhesive precursor for supplying an adhesive to fix the microparticles, and a solvent. In the coating liquid composition, at least one of the group consisting of condition (i), condition (ii), and condition (iii) is satisfied. The coating liquid composition is applied to the substrate by spraying. Here, condition (i) is that the ratio of the binder to the particles is 0.5 or more by mass, condition (ii) further includes a particle contact inhibitor that inhibits contact between the particles in the optical film, and condition (iii) further includes a dispersant equivalent to at least one selected from the group consisting of anionic polymeric dispersants and polymeric dispersants.

18. The method for manufacturing the light control component according to claim 17, wherein, In the coating liquid composition, at least condition (ii) or condition (iii) is met. The method further includes performing a treatment on the optical film to remove at least a portion of the particle adhesion inhibitor or the dispersant.

19. The method for manufacturing the light control component according to claim 18, wherein, The treatment includes plasma irradiation.

20. The method for manufacturing the light control component according to claim 17, wherein, The optical thin film is a low-reflection film with a refractive index of less than 1.

4.

21. The method for manufacturing the light control component according to claim 20, wherein, The optical thin film is a low-reflection film with a refractive index of less than 1.

2.

22. The method for manufacturing the light control component according to claim 17, wherein, The substrate has a curved surface, and the coating liquid composition is applied to the curved surface.

Images