Studio setup kit

Abstract

A studio setup kit is provided for effectively capturing clear images of a subject. The studio setup kit 1 includes: a foldable, cylindrical box 2; a flat rectangular cover 4; a roll-up back panel 6 laid as a background for the subject M; and a roller 8 for winding the back panel 6. A black anti-reflective film 64 is provided on the main side of the back panel 6 facing the subject M. The anti-reflective film 64 is a film with a thickness of 2 μm or more and 40 μm or less, formed by spraying a liquid composition of a specific composition.

Description

Technical Field

[0001] The invention relates to a kit for building a photography studio effective for clearly photographing a subject. Prior Art

[0002] A small studio kit called a mobile studio is known. It can be installed at a desired location and used to photograph products listed in catalogs, brochures, and the like in a pleasant environment (Patent Document 1). The small studio assembled from this kit includes an upper housing with an upper light source; a central housing, which serves as a shooting space and houses the subject while shielding it from external light that is unnecessary for photography (hereinafter referred to as "unnecessary light"); a lower panel with a lower light source; and a space containing a drive unit such as a generator. The upper housing is opened, and the subject is placed in the central housing equipped with a diffuser. After adjusting the light source, such as the upper light source, the subject is photographed using a camera device fixed to the central housing. [Prior Art Literature] [Patent Document]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 8-146498 Summary of the Invention

[0004] [Problems to be solved by the invention]

[0005] However, when the small studio disclosed in Patent Document 1 is used for actual photography, the flash light is scattered on the inner wall of the central housing (especially the background of the subject), resulting in halo, making it difficult to obtain clear photos.

[0006] The present invention was made in view of the above situation. The purpose of the present invention is to provide a kit for constructing a studio for photographing a subject, which is equipped with a backboard for the subject's background. The backboard has an anti-reflection film to prevent the occurrence of halation caused by flashlight, which is very effective for clearly photographing the subject. [Methods used to solve the problem]

[0007] After extensive research, the inventors discovered that a black anti-reflective film formed on a backboard used as a background for a photographic studio, as part of a kit for setting up a photography studio, is effective for capturing clear images of the subject by meeting the following requirements. A liquid composition of a specific composition is used, which contains concave-convex particles in a specified ratio. The concave-convex particles contain inorganic particles with a specified particle size range in a specified mass ratio range. Use the liquid composition of the above specific composition to form a film of specified thickness by spraying. The present inventors have completed the invention provided below based on this new discovery and have solved the above-mentioned problems.

[0008] In the following, (A) a resin component, (B) concavo-convex forming particles, (B1) small inorganic particles having a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less, (B2) large inorganic particles having a particle diameter (d2) of 2 μm or more and 6 μm or less, and (C) a diluting solvent.

[0009] The present invention provides a kit for building a studio. A kit for constructing a studio for photographing a subject includes at least a back plate, which is positioned against the background of the subject in the photographing space. The back plate has a black anti-reflection film on its main surface facing the subject. The anti-reflection film is formed by spraying a liquid composition and has a thickness of 2 μm to 40 μm. The liquid composition contains at least (A), (B) and (C), The composition contains 20% by mass or more and 60% by mass or less of (B) in 100% by mass of the total solid content of the composition, (B) contains 90% by mass or more of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less.

[0010] According to the present invention, an anti-reflection film is provided. This is a black anti-reflective film formed on a backboard used in a studio set for photographing a subject and placed against the background of the subject in the photographic space. The anti-reflective film is formed by spraying a liquid composition to a thickness of 2 μm to 40 μm. The liquid composition contains at least (A), (B) and (C), The composition contains 20% by mass or more and 60% by mass or less of (B) in 100% by mass of the total solid content of the composition, (B) contains 90% by mass or more of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less.

[0011] The above-mentioned liquid composition includes the following aspects: (B2) preferably contains silicon dioxide. The silicon dioxide is preferably a composite silicon dioxide that is blackened by a colorant. (B1) preferably contains carbon black. The viscosity at 25°C is preferably 1 mPa·s or higher and 30 mPa·s or lower.

[0012] The anti-reflection film may include the following aspects: Preferably, the outermost surface of the film-formed surface has a glossiness of less than 1% for light incident at an angle of incidence of 60° (hereinafter referred to as "60° glossiness"), a glossiness of less than 5% for light incident at an angle of incidence of 85° (hereinafter referred to as "85° glossiness"), a reflectivity of less than 4% for light having a wavelength of 550 nm (hereinafter referred to as "reflectivity"), an L value of less than 22 in the CIELAB colorimetric system as measured by SCE, and an optical density of at least 1.0. Preferably, the outermost surface of the film-formed surface has a maximum height Rz (hereinafter also referred to as "Rz") of 7 μm or greater in accordance with JIS B0601:2001, a length average Rsm (hereinafter also referred to as "Rsm") of the profile elements of 80 μm or greater, a skewness Rsk (hereinafter also referred to as "Rsk") of the profile curve of 0.3 or less, and a kurtosis Rku (hereinafter also referred to as "Rku") of 3 or greater. [Effects of the Invention]

[0013] The present invention provides a kit for constructing a photography studio for photographing a subject. The kit comprises a backboard for the subject's background, and the backboard has an anti-reflection film for preventing haloing caused by a flash, which is very effective for clearly photographing the subject. Simple diagram description

[0014] FIG1 is an exploded perspective view showing an example of the structure of a studio-building kit according to one embodiment of the present invention. FIG2 is a perspective view showing a state in which a subject is photographed in a studio equipped with the kit of FIG1. ​​FIG3 is a cross-sectional view of FIG2. FIG4 is a perspective view showing a portion of the kit of FIG1 being folded. FIG5 is a perspective view showing a portion of the kit of FIG4 being completely folded. FIG6 is an enlarged cross-sectional view of portion VI of FIG3. Implementation Method

[0015] The following describes the best embodiment of the present invention. However, the present invention is not limited to the following embodiment. Without departing from the spirit of the present invention, those skilled in the art may make appropriate changes and improvements to the following embodiment based on their common knowledge, which also fall within the scope of the present invention.

[0016] In the numerical ranges described in this specification, the upper limit or lower limit of certain numerical ranges can be replaced by the numerical values ​​disclosed in the examples. In this specification, the content rate or content amount of each component in a composition refers to the total content rate or content amount of the plurality of substances present in the composition, unless otherwise specified, when the composition contains a plurality of substances.

[0017] (Studio Kit) As shown in Figures 1 to 3, a studio construction kit 1 (hereinafter referred to as "kit 1") according to one embodiment of the present invention includes as its main components: a foldable square cylindrical box 2; a flat rectangular cover 4; a rolled backboard 6 laid as a background for the subject M; and a roller 8 for winding the backboard 6.

[0018] The lid 4 is rectangular in plan view and is configured so that a thin-walled portion on one side is connected to a thin-walled portion on the upper end (upper opening) of the case 2. This allows it to open and close as the top plate of the case 2. When the lid 4 is open (exposing the upper opening of the case 2), a subject M is placed in the case 2, and then the lid 4 is closed, the shooting space within the case 2 becomes light-shielded.

[0019] The box body 2 is in the shape of a square cylinder and has a front wall 22, a rear wall 24 and side walls 26. A photographing window 22a is formed in the front wall 22. This allows the subject M placed in the box 2 to be illuminated from the outside by the light 3 and photographed by the imaging device 5 (digital camera, analog camera, video camera, etc.). The upper edge of the photographing window 22a can be curved into an elliptical shape to prevent interference with the photographing process. A groove 26a is formed at the upper end of the side wall 26 (on the rear wall 24 side) to support the shaft 8a of the roller 8. The roller 8 can be freely attached and detached from the groove 26a. The middle portion of the back sheet 6, which is fed from a roll (located outside the box 2; see Figures 2 and 3), is wound around the roller 8, and the back sheet 6 is pulled into the box 2, making it easy to change the curvature of the back sheet 6. The back sheet 6 is a thin material that serves as a background for the subject M. Its detailed structure will be described later. As shown in FIG2 , the extended front end of the back panel 6 can be pressed by the lower end (lower opening side) of the housing 2. Alternatively, it can be fixed to the rear surface of the front wall 22 using a clip (not shown). Alternatively, it can be pressed by the subject M.

[0020] A thin-walled portion 26b, cut into a V-shape, is formed in the center of the side wall 26 as a vertical fold. As shown in Figure 4 , the side wall 26 is formed to allow for inward valley folding, bounded by the thin-walled portion 26b. Furthermore, the corners between the side wall 26 and the rear wall 24, as well as between the side wall 26 and the front wall 22, are thinner. This allows the front wall 22 and rear wall 24 to be folded, as shown in Figure 5 . As described above, the components of the box body 2 (front wall 22, rear wall 24, side walls 26) and the cover body 4 are all formed of a lightweight plastic material, as an example. They can also be formed of cardboard or wood.

[0021] In addition, aluminum foil 28 with high reflectivity can be attached to the inner sides of the front wall 22, rear wall 24, side wall 26 and lid 4 of the housing 2 as a diffusion part. The housing 2 can be formed of a material with high reflectivity (such as foamed polystyrene).

[0022] (Back panel) As shown in Figure 6 , the backing sheet 6 used in the kit 1 comprises a sheet-like substrate 62 and a black antireflection film 64. The sheet-like substrate 62 can be made of, for example, a synthetic resin (polyolefin, polyester, polyamide, etc.), paper, cloth, or nonwoven fabric. A black pigment (carbon black, aniline black, etc.) can be pre-mixed into the sheet-like substrate.

[0023] When the sheet substrate 62 is made of synthetic resin, it is preferred to apply a matte finish to one or both sides of the sheet substrate as needed. This can enhance the anti-halation effect. Matting can be performed by methods such as chemical etching, sandblasting, or chemical matting using synthetic resin and a surface roughening material. The thickness of the sheet substrate 62 is not limited; however, if the sheet substrate 62 is made of synthetic resin, its thickness is preferably between 25 μm and 200 μm. If the thickness is less than 25 μm, the anti-reflection effect may not be fully achieved, while if it exceeds 200 μm, it may be disadvantageous in terms of weight reduction.

[0024] (Black anti-reflective film) In this example, a black antireflection film 64 is provided on a portion or all of the principal surface of the sheet substrate 62. The term "principal surface" encompasses not only the antireflection film formed directly on the principal surface of the sheet substrate 62, but also the antireflection film formed on an upper surface after interposing any layer (e.g., a primer layer) between the sheet substrate 62 and the antireflection film 64. The term "partially or entirely" also encompasses the antireflection film 64 formed on a portion of the principal surface of the sheet substrate 62.

[0025] The anti-reflection film 64 of this example is composed of a film formed from a liquid composition. <Liquid composition> A liquid composition (hereinafter referred to as the "composition") is used to form a film on the main surface of a sheet-like substrate 62 (hereinafter referred to as the "substance to be coated") and includes (A) a resin component, (B) concavo-convex particles, and (C) a diluent. (B) used in the composition includes (B1) small particles with a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less, and (B2) large particles with a particle diameter (d2) of 2 μm or more and 6 μm or less. The composition may also include components other than (B1) and (B2). Specifically, the composition includes (A), (B1), (B2), and (C). The composition is suitable for spray coating when applied to the surface of the substrate.

[0026] -(A)- (A) used to form the composition serves as the binder for (B). The material of (A) is not particularly limited, and either a thermoplastic resin or a thermosetting resin can be used. Examples of thermosetting resins include acrylic resins, ethyl formate resins, phenolic resins, melamine resins, urea resins, diallyl phthalate resins, unsaturated polyester resins, epoxy resins, and alkyd resins. Examples of thermoplastic resins include polyacrylate resins, polyvinyl chloride resins, butyral resins, and styrene-butadiene copolymer resins. From the perspective of the heat resistance, moisture resistance, solvent resistance, and surface hardness of the resulting uneven film, it is preferable to use a thermosetting resin as (A). When considering the flexibility and toughness of the resulting film, acrylic resin is particularly preferred as the thermosetting resin. One type of (A) can be used alone, or two or more types can be used in combination. The content (total amount) of (A) is not particularly limited, but considering the ratio with other ingredients, it is preferably 5% by mass or more, more preferably 15% by mass or more, more preferably 25% by mass or more, preferably 50% by mass or less, more preferably 45% by mass or less, and more preferably 40% by mass or less relative to the total amount of all solid components of the composition (100% by mass).

[0027] -(B)- (B) used in forming the composition must be a combination of a plurality of concavo-convex particles of varying sizes. (B) is primarily a combination of small particles (B1) and large particles (B2). For example, when (B) is composed of only two types of concavo-convex particles of varying sizes (i.e., (B1) and (B2)), the particle diameter (d2) of (B2) is preferably 10 times or greater, more preferably 15 times or greater, preferably 40 times or less, and more preferably 35 times or less, as large as the particle diameter (d1) of (B1). As (B), when three or more types of concave-convex forming particles of different sizes are used, the relationship between the particle diameter (d max) of the concave-convex forming particles indicating the maximum particle diameter and the particle diameter (d min) of the concave-convex forming particles indicating the minimum particle diameter, that is, (d max) compared to (d min), can be adjusted to preferably 10 times or more, preferably 15 times or more, preferably 40 times or less, and preferably 35 times or less.

[0028] In one embodiment, (d1) is preferably 0.05 μm or more, more preferably 0.1 μm or more, more preferably 0.4 μm or less, and even more preferably 0.3 μm or less. (d2) is preferably 2 μm or more, more preferably 3 μm or more, more preferably 6 μm or less, more preferably 5 μm or less, and even more preferably 4 μm or less. The particle diameter (d1) of (B1) and the particle diameter (d2) of (B2) were measured using a laser diffraction / scattering particle size distribution measuring device, with the median diameter being the equal volume standard.

[0029] In one embodiment, the mass ratio of (B2) in (B) to (B1) is 1:1, preferably exceeding 1.75, more preferably 1.8 or greater, more preferably less than 3.58, and more preferably 3.3 or less. Within this mass ratio range, the combined use of (B1) and (B2) having the aforementioned specific particle size range facilitates embedding one particle of (B1) between two adjacent particles of (B2) in the formed film. As a result, the inventors have discovered that, in addition to achieving low gloss and low reflectivity on the film surface, blackness can also be improved (lower L value).

[0030] The total content (total amount) of (B1) and (B2) in (B) is preferably 90% by mass or more, more preferably 95% by mass or more. The upper limit is not particularly limited and is 100% by mass. That is, in one embodiment, (B1) and (B2) are preferably 90% by mass or more in 100% by mass of (B).

[0031] The content (total amount) of (B) relative to the total solids content of the composition (100% by mass) is preferably 20% by mass or more, more preferably 25% by mass or more, more preferably 30% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, more preferably 45% by mass or less, and particularly preferably 40% by mass or less. If the total amount of (B) is less than 20% by mass, gloss may be increased and optical density may be insufficient. If it exceeds 60% by mass, the amount of (A) in the resulting coating film may be relatively low, resulting in the coating film peeling off the coated object.

[0032] As (B2), either resin particles or inorganic particles may be used. Examples of resin particles include melamine resins, benzoguanamine resins, benzoguanamine / melamine / formalin condensates, acrylic resins, ethyl formate resins, styrene resins, fluororesins, and silicone resins. On the other hand, examples of inorganic particles include silica, alumina, calcium carbonate, barium sulfate, titanium oxide, and carbon. These particles may be used alone or in combination of two or more.

[0033] To achieve superior properties, (B2) preferably uses inorganic particles. Using inorganic particles as (B2) facilitates the formation of a highly light-shielding film with lower gloss. Silicon dioxide is preferred as the inorganic particles used in (B2). While the shape of (B2) is not particularly limited, to achieve even lower gloss, lower reflectivity, and a lower L value on the resulting film surface, particles with a narrow particle size distribution (e.g., a CV (Coefficient of Variation) value of 15 or less) (sharp-edged particles) are preferred. The CV value numerically represents the degree of dispersion (particle diameter variability) of the particle size distribution relative to the average particle size (arithmetic mean particle size). Using such particles increases the chances of contact between (B2) and (B1) in the resulting film, facilitating even lower gloss, lower reflectivity, and a lower L value on the film surface. Furthermore, to further reduce the glossiness of the film-forming surface, it is preferable to use amorphous particles as (B2). Among these, porous amorphous silica particles are particularly preferred as (B2). By using such particles as (B2), the glossiness of the film surface can be further reduced due to repeated refraction of light on the surface and inside of (B2) during film formation.

[0034] In one embodiment, to enhance the effect of preventing light reflection (so-called halation) on the film-forming surface, (B2) can be colored black using an organic or inorganic colorant. Examples of such materials include composite silica, conductive silica, and black silica. Examples of composite silica include carbon black (hereinafter referred to as "CB") and silica synthesized and composited at the nanoscale. Examples of conductive silica include silica particles coated with conductive particles such as CB. Examples of black silica include natural ore containing millstones within silica rock.

[0035] On the other hand, as with (B2), the material of (B1) is not particularly limited, and either resin particles or inorganic particles can be used. Examples of resin particles include melamine resin, benzoguanamine resin, benzoguanamine / melamine / formalin condensate, acrylic resin, ethyl formate resin, styrene resin, fluororesin, and silicone resin. On the other hand, examples of inorganic particles include silica, alumina, calcium carbonate, barium sulfate, titanium oxide, and CB. These particles can be used alone or in combination of two or more.

[0036] As (B1), for example, CB added as a coloring agent or a conductive agent can also be used. By using CB as (B1), the formed film is colored, thereby enhancing the anti-reflection effect and obtaining a good antistatic effect.

[0037] -(C)- (C) is added to form the composition to dissolve (A) and adjust the overall viscosity of the composition. The use of (C) facilitates mixing of (A) and other components added as needed, thereby improving the uniformity of the composition. Furthermore, the ability to adjust the viscosity of the composition improves the workability of the composition and the uniformity of the coating thickness when forming a film on the surface of the coated object.

[0038] The solvent (C) is not particularly limited as long as it can dissolve (A), and examples thereof include organic solvents and water. Examples of organic solvents include methyl ethyl ketone, toluene, propylene glycol monomethyl ether acetate, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, and butanol. (C) may be used alone or in combination of two or more.

[0039] The content (total amount) of (C) in the composition is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and preferably 20 parts by mass or less, relative to 100 parts by mass of (A) in order to obtain the effects obtained by incorporating (C) as described above.

[0040] -(D) Optional ingredients- In addition to the aforementioned components ((A), (B), and (C)), the composition may also contain (D) to the extent that the effects of the present invention are not impaired. Examples of (D) include leveling agents, thickeners, pH adjusters, lubricants, dispersants, defoaming agents, hardeners, and reaction catalysts.

[0041] Especially when a thermosetting resin is used as (A), the crosslinking of (A) can be accelerated by adding a hardener. Examples of hardeners include urea compounds, melamine compounds, isocyanate compounds, epoxy compounds, aziridine compounds, and oxazolidinone compounds having functional groups. Among these hardeners, isocyanate compounds are preferred. Hardeners may be used alone or in combination of two or more. The ratio of the hardener to be added to the composition is preferably 10 parts by mass or more and 80 parts by mass or less per 100 parts by mass of (A). Adding the hardener within this range increases the hardness of the formed film. As a result, even when the film is placed in an environment where it slides against other components, the film's surface properties are maintained for a long period of time, and low gloss, high light shielding, low reflectivity, and high blackness are easily maintained. When a hardener is added to the composition, a reaction catalyst may be used to accelerate the reaction between (A) and the hardener. Examples of the reaction catalyst include ammonia and ammonium chloride. The reaction catalyst is preferably added to the composition in a ratio of 0.1 parts by mass to 10 parts by mass per 100 parts by mass of the hardener.

[0042] For one embodiment of the composition, the viscosity at 25°C is preferably 1 mPa·s or higher, preferably 30 mPa·s or lower, and even more preferably 20 mPa·s or lower, in order to maintain smoothness on the surface of the coating while allowing for spray application. If the viscosity of the composition is too low, a film thick enough to prevent halation may not form. If the viscosity of the composition is too high, the composition may not be sprayed evenly onto the surface of the coating, resulting in the inability to form a film of sufficient thickness and uniform properties. The above viscosity varies depending on the components contained in the composition, that is, the type and molecular weight of (A) and (B) used. In addition, when (D) is blended in addition to (A) and (B), the viscosity will also vary depending on the type and molecular weight of (D). However, it can be easily adjusted by adjusting the content of (C) in the composition within the above range.

[0043] One form of the composition is prepared by adding (A) and (B) to (C), and optionally adding (D), and mixing and stirring. The order of mixing the components is not particularly limited, as long as the components are uniformly mixed.

[0044] The composition according to one aspect of the present invention may be a one-component or two-component composition. When a hardener (D) is incorporated into the composition, the composition according to one aspect may be a two-component composition comprising a first liquid containing components other than the hardener and a second liquid containing the hardener.

[0045] The film-forming method is not particularly limited. The film can be formed on the substrate by any method or apparatus, such as spray coating (e.g., air spray, airless spray, electrostatic spray, etc.), brush coating, curtain flow coating, roller coating, rod coating, kiss roll, metering roll, gravure roll, reverse roll, dip coating, or die-cast coating.

[0046] In particular, the composition of one form is preferably formed by spraying droplets from a relatively small nozzle hole. In other words, the film formed by spraying is a sprayed film. By spraying a composition in one form, droplets of the composition gradually adhere to the surface of the object being coated. Simultaneously, the (C) in the droplets already adhering to the object evaporates. As a result, solid components (particles) removed from the droplets gradually accumulate on the surface of the object, forming a solid particle layer. According to one form, this solid particle layer forms a film.

[0047] When a thermosetting resin is used as (A) and a composition containing a hardener is used as (D), it is preferred to heat the solid particle layer after attaching it to the surface of the coated object to cure it. In this case, even if a small amount of (C) remains in the layer before heating, the heating will almost completely volatilize (C). The heating conditions can be appropriately adjusted depending on the thickness of the laminate before heating, the heat resistance of the substrate, and the type of (C) used. An example of the heating conditions is 70°C to 150°C for 1 minute to 10 minutes, preferably 100°C to 130°C for 2 minutes to 5 minutes.

[0048] The thickness of the antireflection film 64 is not particularly limited, as long as it maintains good adhesion to the sheet-like substrate 62 and prevents the formation of halation on the surface where the film is formed. Preferred film thicknesses include, for example, 2 μm or greater, 5 μm or greater, 40 μm or less, and 25 μm or less. The thickness of the anti-reflection film 64 is the height from the surface of the coated object including the protrusions of the films (B2) and (B1). The film thickness can be measured according to the method of JIS K7130.

[0049] <Film Characteristics> The properties of a film formed from a composition of a certain form are as follows.

[0050] (gloss, reflectivity, L value, optical density, adhesion) The film formed from the composition of the related form preferably has a surface glossiness of less than 1% at 60°, less than 5% at 85°, a reflectivity of less than 4%, an L value of less than 22, and an optical density of greater than 1.0.

[0051] Here, when a film formed from a composition of one embodiment is exposed to the outermost surface, as described above, the 60° gloss, 85° gloss, reflectivity, L value, and optical density of the film surface are preferably within the above-mentioned ranges. When another film is applied over a film formed from a composition of one embodiment, the 60° gloss, 85° gloss, reflectivity, L value, and optical density of the surface of the other film (i.e., the outermost surface of the backsheet 6) are preferably within the above-mentioned ranges. Hereinafter, these surfaces are collectively referred to as the "film outermost surface."

[0052] A film formed from the composition of one embodiment preferably has a 60° gloss of less than 1%, an 85° gloss of less than 5%, a reflectance of 4% or less, an L value of 22 or less, and an optical density of 1.0 or greater on the outermost surface of the film. By setting the 60° gloss, 85° gloss, reflectance, L value, and optical density of the outermost surface of the film within the above ranges, low gloss and reflectance (excellent anti-reflection properties, the same applies hereinafter), high blackness, and high light-shielding properties can be achieved on the outermost surface of the film.

[0053] The upper limit of 60° glossiness is preferably less than 0.8%, and even more preferably less than 0.5%. Adjusting 60° glossiness within this range can enhance the subject's attractiveness in frontal shots. There is no specific lower limit for 60° glossiness; the lower the better. The upper limit of 85° glossiness is preferably less than 3.5%, and even more preferably less than 2.5%. By adjusting 85° glossiness within this range, angle dependence is eliminated, making it easier to enhance the subject's appeal regardless of the angle. There is no specific lower limit for 85° glossiness; the lower the better.

[0054] The upper limit of the reflectivity is preferably 3% or less, and more preferably 2.5% or less. The lower limit of the reflectivity is not specifically limited; the lower the better. By adjusting the reflectivity within this range, the attractiveness of the subject is enhanced (increasing the subject's attractiveness by preventing reflections).

[0055] The upper limit of the L value (blackness) is preferably 20 or less, and more preferably 18 or less. While there is no specific lower limit for the L value, the lower the better for clearer subjects. Adjusting the L value within this range improves blackness, making blackness more pronounced and enhancing design quality, thereby maintaining a high-quality appearance. The L value above is the lightness L* value of the film's outermost surface expressed using the SCE method using the CIE 1976 L*a*b* (CIELAB) color scale. The SCE method eliminates specular reflection, meaning it measures color by eliminating specular reflection. The SCE method is defined in JIS Z 8722 (2009). Because the SCE method eliminates specular reflection, the color is closer to what the human eye actually sees. CIE stands for Commission internationale de l'éclairage, meaning International Commission on Illumination. The CIELAB color display system, recommended in 1976 and specified in JIS Z 8781(2013), is an equal color space for measuring color differences caused by differences in perception and device. CIELAB's three coordinates are represented by L*, a*, and b* values. L* indicates lightness and is scaled from 0 to 100. An L* value of 0 represents black, and an L* value of 100 represents diffuse white. The a* value represents colors between red and green. Negative a* values ​​indicate colors closer to green, while positive values ​​indicate colors closer to red. The b* value represents colors between yellow and blue. Negative b* values ​​indicate colors closer to blue, while positive values ​​indicate colors closer to yellow.

[0056] The lower limit of optical density is preferably 1.5 or higher, and more preferably 2.0 or higher. By adjusting the optical density within this range, light-shielding properties can be further enhanced. There is no specific upper limit for optical density; the higher the better.

[0057] The glossiness, reflectance, L value, and optical density can be measured using a post-processing method. In addition to the aforementioned properties (gloss, reflectivity, L value, and optical density), a film formed from the composition preferably exhibits good adhesion to the surface of the coated object. As shown in the adhesion evaluations described in the Examples below, the film formed from the composition preferably exhibits adhesion to the surface of the coated object with a coating film residue of 75% or greater.

[0058] (Rz, Rsm, Rsk, Rku, Ra) A film formed from the composition of the aforementioned embodiment preferably has a maximum height Rz of 7 μm or greater, a profile element length average Rsm of 80 μm or greater, a profile skewness Rsk of 0.3 or less, and a profile kurtosis Rku of 3 or greater on the film's outermost surface. By setting Rz, Rsm, Rsk, and Rku on the film's outermost surface within the aforementioned ranges, the film's outermost surface gloss, optical density, reflectivity, and L value can be within the aforementioned ranges (60° gloss less than 1%, 85° gloss less than 5%, reflectivity less than 4%, L value less than 22, and optical density greater than 1.0). As a result, the film's outermost surface exhibits low gloss, low reflectivity, high blackness, and, if necessary, high light-shielding properties.

[0059] The lower limit of Rz is preferably 10 μm or greater. By setting the lower limit of Rz to the above value, it is easier to adjust low gloss, low reflectivity, and high light-shielding properties. The upper limit of Rz is not particularly limited, but is preferably 50 μm or less, and more preferably 30 μm or less. By setting the upper limit of Rz to the above value, it is easy to achieve further low gloss, low reflectivity, high blackness, and high light-shielding properties on the outermost surface of the film.

[0060] Rsm represents the average length of the profile curve elements within a reference length. The lower limit of Rsm is preferably 100 μm or greater, and more preferably 120 μm or greater. Setting the lower limit of Rsm to this value makes it easier to achieve the advantage of low gloss. While the upper limit of Rsm is not specifically limited, it is preferably 160 μm or less. Within this range, superior adhesion is achieved between the coated substrate and the film formed thereon.

[0061] Rsk is an indicator that represents the deviation from the mean line of the film's surface irregularities, expressed as the cube of the root mean square height (Zq) and the average of the cube of the height Z(x) within a dimensionless reference length. This indicator, in other words, indicates the degree of deformation. A positive Rsk value (Rsk > 0) indicates that the irregularities are biased toward the concave side, resulting in sharper protrusions. A negative Rsk value (Rsk < 0) indicates that the irregularities are biased toward the convex side, resulting in blunter protrusions. Blurred protrusions on the profile curve will result in lower haze than sharper ones. The upper limit of Rsk is preferably 0.2 or less. By setting the upper limit of Rsk to this value, the advantage of low gloss can be more easily achieved. The lower limit of Rsk is not particularly limited, but is preferably 0 or greater. By setting the lower limit of Rsk to this value, the advantage of low gloss can be more easily achieved.

[0062] Rku is an indicator that expresses the sharpness of the top edges of the film's outermost surface irregularities, expressed as the fourth power of the height Z(x) averaged over a dimensionless reference length, the root mean square height (Zq). As Rku increases, the top edges of the irregularities become more pointed. This increases the inclination angle near the front edges of the irregularities, while the inclination angles elsewhere decrease, tending to cause background reflections. Conversely, as Rku decreases, the top edges of the irregularities become more flat, resulting in a smaller inclination angle at the front edges, tending to cause background reflections. The lower limit of Rku is preferably 3.3 or higher. By setting the lower limit of Rku to this value, the advantage of low gloss can be more easily achieved. The upper limit of Rku is not particularly limited, but is preferably 5 or lower. By setting the upper limit of Rku to this value, the advantage of low gloss can be more easily achieved.

[0063] The film formed from the composition of the related form has an arithmetic average roughness (Ra) of the outermost surface of the film of preferably 0.5 μm or more, more preferably 1.0 μm or more, and even more preferably 1.5 μm or more.

[0064] In addition, Rz, Rsm, Rsk, Rku and Ra of the outermost surface of the film as described above can be measured and calculated according to JIS B0601:2001.

[0065] The anti-reflection film 64 of the aforementioned embodiment can be formed directly on the main surface of the sheet-like substrate 62 without undergoing pretreatment or after undergoing pretreatment, but is not limited to this embodiment. For example, an anti-reflection film sheet can be prepared by spraying an anti-reflection film onto an ultra-thin plastic film (such as a PET film), cutting the sheet to conform to the shape of the main surface of the sheet-like substrate 62, and then attaching the sheet to the main surface of the sheet-like substrate 62 via an adhesive layer to form the anti-reflection film 64.

[0066] (How to build a shed) Next, a method of constructing a studio using the above-mentioned kit 1 will be described. First, as shown in Figure 5, the folded box body 2 of the kit 1 is pushed outwards, as shown in Figure 4, by pushing the thin portion 26b of the side wall 26 outwards, returning the box body to the rectangular shape shown in Figure 1. This allows the kit 1 to be folded and carried to the filming location, providing excellent portability and convenience.

[0067] Next, as shown in Figure 2, roller 8 is installed in groove 26a, and the rolled backing plate 6 is wound around roller 8 with the anti-reflection film 64 facing outward (toward the subject M during delivery). The rolled backing plate 6 is then pulled into the housing 2 to create a curved background. Here, the subject M is placed on the backing plate 6, and the lid 4 is closed to prevent light from entering from outside the imaging window 22a. Then, when the light 3 is used to illuminate the subject M through the shooting window 22a, the light is reflected by the aluminum foil 28 and becomes diffuse light, making it difficult for the subject M to be shadowed, that is, providing a uniform lighting effect. In this state, the subject M can be photographed by the camera 5.

[0068] By using the kit 1 according to one embodiment of the present invention, a studio that is effective for clearly photographing the subject can be easily constructed. After the photograph is completed, the roller 8 is removed and the case 2 is folded as shown in FIG5 , thereby saving storage space for the kit 1 .

[0069] Furthermore, in the above example, the box body 2 is folded by forming a V-shaped thin-walled portion 26b in the center of the side wall 26 as a folding portion, but the present invention is not limited to this configuration. The thin-walled portion 26b serving as the folding portion does not need to be formed in the center of the side wall 26, so the box body 2 can also be formed into a non-foldable structure. Experimental example

[0070] The present invention is described below in detail based on experimental examples (including Examples and Comparative Examples). However, the present invention is not limited to these experimental examples. In the following description, "part" means "part by mass" and "%" means "% by mass."

[0071] [Components of the composition] As A (resin component), the following items were prepared. A1: Thermosetting acrylic resin (ACRYDIC A801, manufactured by DIC Corporation, solid content 50%)

[0072] The following items were prepared as B1 (small particles) belonging to B (concave-convex particles). B1a: Carbon black (CB) (particle size 150nm) (MH Black_#273, manufactured by Mikoku Color Co., Ltd., CB content 9.5%) B1b: Transparent silicon dioxide (particle size 58nm) (ACEMATT R972, manufactured by EVONIK)

[0073] As B2 (large particles) belonging to B, the following items are prepared. B2a: Composite silicon dioxide (particle size 3μm) (BECSIA ID, manufactured by Fuji Silysia Chemical Co., Ltd.) B2b: Black acrylic beads (particle size 3μm) (RUBCOULEUR 224SMD black, manufactured by Dainichi Seika Industries, Ltd.) B2c: Transparent silicon dioxide (particle size 4.1μm) (SYLYSIA 430, manufactured by Fuji Silysia Chemical Co., Ltd.) B2d: Transparent silicon dioxide (particle size 8μm) (SYLYSIA 450, manufactured by Fuji Silysia Chemical Co., Ltd.) B2e: Transparent acrylic beads (particle size 3μm) (Uni powder-NMB-0320C, manufactured by ENEOS)

[0074] The BECSIA ID used in B2a (composite silica) is a composite particle of CB and silica, with a CB / silica mass ratio of approximately 25 / 75. MHI Black #273 used in B1a (CB) is a CB dispersion. Of the 18% total solids content, 9.5% is CB, and the remaining 8.5% is other compounds. Of the 8.5% of other compounds, 3% is a copper compound and 5.5% is an acrylic resin.

[0075] As D (optional ingredient), the following items are prepared. D1: Isocyanate compound (TAKENATE D110N, manufactured by Mitsui Chemicals, solid content 75%)

[0076] [Object to be painted] As the coating object, a sample substrate for evaluation was prepared. A black polycarbonate sheet (100 mm long, 50 mm wide, 1.5 mm thick) was used as the sample substrate. Both sides of the sheet in the thickness direction (X direction) were matte-finished to form a rectangular polycarbonate flat plate (100 mm long, 50 mm wide, 1.5 mm thick).

[0077] [Experimental Examples 1-17] 1. Preparation of the composition To achieve a solid content ratio as shown in Table 1, with a total solid content of approximately 25% by mass, the components of each experimental example were added to a required amount of a mixed solvent (50:50 butanone:butyl acetate) as the diluent (C), and the mixture was stirred to prepare a liquid composition (hereinafter referred to as the "liquid").

[0078] 2. Preparation of evaluation samples The liquid obtained in each experimental example was sprayed onto one side of the substrate (glass plate) using the coating method described in (3-1) below. The sample for evaluation was then dried by heating at 120°C for 3 minutes. The resulting heated coating film (hereinafter referred to as the "coating film") formed a solid particle accumulation layer having an average film thickness of 20 μm on the surface of the substrate.

[0079] 3. Evaluation The liquid formulations obtained in each experimental example were evaluated for various properties (applicability) using the following method (liquid formulation evaluation). Furthermore, the coating films formed on the evaluation samples obtained in each experimental example were evaluated for various properties (properties and surface texture) using the following method (sample evaluation). The results are shown in Table 1.

[0080] [Liquid preparation evaluation] (3-1) Coating properties The coating properties of the liquid agent are evaluated by observing the uneven coating after spray coating. Each liquid was injected into an air sprayer (an air brush (SPRAY-WORK HG single air brush, manufactured by TAMIYA) attached to an air can (SPRAY-WORK AIR CAN 420D, manufactured by TAMIYA). The spray was applied from the tip of the air brush to the outer surface of the object at a distance of 10 cm. After 10 seconds, the resulting solid particle layer was visually evaluated for uneven coating. The evaluation criteria were as follows.

[0081] ○: No uneven coating (uneven thickness) was observed. △: Local uneven coating has been confirmed ×: Uneven coating has been confirmed in most areas

[0082] [Sample Evaluation] (3-2) Characteristics -Glossiness- The glossiness of the coating film surface formed on each evaluation sample was measured at an incident angle of 60° (60° specular gloss) and at an incident angle of 85° (85° specular gloss) using a gloss meter (VG 7000, manufactured by Nippon Denshoku Industries) according to JIS Z8741 at nine points. The average of the values ​​was used as the glossiness. The evaluation criteria were as follows.

[0083] (60° mirror gloss) ◎: Glossiness is less than 0.8% (extremely excellent) ○: Glossiness is 0.8% or more and less than 1% (excellent) ×: Glossiness is 1% or more (inadequate)

[0084] (85° mirror gloss) ◎: Glossiness is less than 3.5% (excellent) ○: Glossiness is 3.5% or more, less than 5% (excellent) ×: Glossiness is 5% or more (inadequate)

[0085] (Comprehensive evaluation of gloss) ◎: Both the 60° and 85° specular glossiness ratings are ◎ (extremely good low gloss) 0: At least one of the evaluations of 60° specular gloss and 85° specular gloss is 0, and neither is × (good low gloss) ×: At least one of the evaluations of 60° specular gloss and 85° specular gloss was × (low glossiness is insufficient)

[0086] -Reflectivity- The reflectance of the coating film surface formed on each evaluation sample with respect to light with a wavelength of 400 to 700 nm was measured using a spectrophotometer (CM-5, manufactured by Konica Minolta) according to JIS Z8722. Nine points were measured at 1 nm intervals, and the average of the measured results was used as the reflectance. The evaluation criteria were as follows.

[0087] ◎: Reflectivity is less than 3% (extremely good low reflectivity) ○: Reflectivity is more than 3% and less than 4% (good low reflectivity) ×: Reflectivity exceeds 4% (low reflectivity is insufficient)

[0088] -Blackness- The blackness of the coating surface formed on each evaluation sample was evaluated by measuring the lightness L* value of the coating surface in the CIE 1976 L*a*b* (CIELAB) color system using the SCE method. The lightness L* value was measured using a spectrophotometer (CM-5, manufactured by Konica Minolta Co., Ltd.) according to the method described in JIS Z8781-4:2013. The evaluation criteria are as follows. The measurement used CIE standard illuminant D65 as the light source, with a viewing angle of 10°, and the L* value in the CIELAB color system was calculated using the SCE method. CIE standard illuminant D65 is specified in JIS Z 8720 (2000), "Standard Illuminants and Standard Light Sources for Color Measurement," and ISO 10526 (2007). CIE standard illuminant D65 is used when expressing the color of objects illuminated by daylight. The viewing angle of 10° is specified in JIS Z 8723 (2009), "Methods for Visual Comparison of Surface Color," and ISO / DIS 3668.

[0089] ◎: L value is less than 20 (extremely high blackness) ○: L value is more than 20 and less than 22 (high blackness) ×: L value exceeds 22 (blackness is insufficient)

[0090] -Light blocking properties- The light-shielding properties of the coatings formed on each evaluation sample were evaluated by calculating the optical density of the coatings. The optical density of the coatings formed on each evaluation sample was calculated using an optical densitometer (X-rite 361T (Ortho filter), manufactured by Japan Flat Panel Machinery Co., Ltd.) by illuminating the coated side of the sample with a vertically transmitted light beam. The optical density was expressed as a logarithm compared to the uncoated state. An optical density of 6.0 or higher was considered the upper detection limit. The evaluation criteria were as follows.

[0091] ◎: Optical density is 1.5 or more (light-shielding properties are very good) ○: Optical density is 1.0 or higher and less than 1.5 (good light-shielding properties) ×: Optical density is less than 1.0 (light-shielding property is insufficient)

[0092] -Adhesion- The adhesion of the coating film formed on each evaluation sample to the coated surface was evaluated by scoring the film with a commercially available utility knife in a checkered pattern, affixing transparent tape (Cellotape, manufactured by Nichiban) to the surface, and then removing the tape. The remaining coating was then visually inspected. The evaluation criteria were as follows.

[0093] ◎: Coating film remains 100% (extremely high adhesion) ○: The coating film remains at least 75% but less than 100% (high adhesion) ×: The coating film remains less than 75% (insufficient adhesion)

[0094] - Comprehensive Assessment - The glossiness, reflectivity, blackness, light-shielding properties, and adhesion mentioned above were comprehensively evaluated. The evaluation criteria are as follows.

[0095] ◎: Glossiness, reflectivity, blackness, light blocking and adhesion are all ◎ 0: At least one of the evaluations of glossiness, reflectivity, blackness, light shielding and adhesion is 0, and none of them are × ×: At least one of the evaluations of glossiness, reflectivity, blackness, light shielding and adhesion is ×

[0096] (3-3) Surface properties -Rz value, Rsm value, Rsk value, Rku value, Ra value- The surface properties (Rz, Rsm, Rsk, Rku, and Ra) of the coating films formed on each evaluation sample were measured using a surface roughness tester (SURFCOM 480B, manufactured by Tokyo Seimitsu Co., Ltd.) according to the method described in JIS B0601:2001. The evaluation criteria are as follows.

[0097] (Rz) ◎: Rz is 10 μm or more (very good) ○: Rz is 7 μm or more and less than 10 μm (good) ×: Rz is less than 7 μm (defective)

[0098] (Rsm) ◎: Rsm is 120 μm or more (very good) ○: Rsm is 80 μm or more and less than 120 μm (good) ×: Rsm is less than 80μm (defective)

[0099] (Rsk) ◎: Rsk is 0.2 or less (extremely good) ○: Rsk is more than 0.2 and less than 0.3 (good) ×: Rsk exceeds 0.3 (defective)

[0100] (Rku) ◎: Rku is 3.3 or above (very good) ○: Rku is 3 or higher, but less than 3.3 (good) ×: Rku is less than 3 (poor)

[0101] (Ra) ◎: Ra is 1.5 μm or more (very good) ○: Ra is 0.5 μm or more and less than 1.5 μm (good) ×: Ra is less than 0.5 μm (poor)

[0102]

Table 1

[0103] 4. Investigation As shown in Table 1, when the liquid formulation did not contain at least one of (B1) and (B2) as (B) (Experiments 6, 7, 9, 11, and 12), at least one of the film characteristics of gloss, reflectivity, L value, light-shielding properties, and adhesion was not satisfied. On the other hand, even when the liquid formulation contained both (B1) and (B2) as (B) (Experiments 1-5, 8, and 10), if the mass ratio of (B2) to (B1):1 was less than 1.75 (Experimental Example 1) or greater than 3.58 (Experimental Example 5), at least one of the film characteristics of L value and adhesion was not satisfied. Even if both (B1) and (B2) are included, and the mass ratio of (B1):(B2) is within an appropriate range (exceeding 1.75 and less than 3.58) (Experimental Examples 2-4, 13-17), when the (B) content (total amount) in 100% by mass of the total solid content is less than 20% by mass (Experimental Example 13) or exceeds 60% by mass (Experimental Example 17), at least one of the film properties of glossiness, reflectivity, L value, light-shielding properties, and adhesion cannot be satisfied. On the other hand, when the mass ratio of (B2) to (B1):1 is greater than 1.75 and less than 3.58, and the total content of (B) per 100% by mass of the total solid content of the composition is greater than 20% by mass and less than 60% by mass (Experimental Examples 2-4, 8, 10, 14-16), all the coating properties, film characteristics, and film shapes of the liquid can be satisfied.

[0104] 1: Studio Building Kit 2: Cabinet 22: Anterior wall 22a: Photography window 24: Back wall 26: Sidewall 26a: Slot 26b: thin-walled portion (folded portion) 28: Aluminum foil (diffusing part) 4: Cover 6: Back panel 62: Sheet substrate 64: Anti-reflective film 8: Roller 8a: shaft 3: Light 5: Camera device M: Subject

Claims

1. A kit for setting up a photography studio, comprising at least a back panel disposed on the background of the subject in the shooting space, the back panel having a black anti-reflective film on the main side facing the subject, the anti-reflective film being a film with a thickness of 2 μm or more and 40 μm or less formed by spraying from a liquid composition, the liquid composition comprising at least (A), (B) and (C), wherein in 100% by mass of the total solids content of the composition, (B) comprises 20% by mass and 60% by mass of (B), (B) comprises 90% by mass of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 or more and 3.3 or less; (A) is a resin component, (B) is an unevenness-forming particle, and (B1) is an inorganic small particle with a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less. (B2) refers to inorganic large particles with a particle diameter (d2) of 2 μm or more and 6 μm or less; (C) refers to a diluting solvent; the surface of the film has a gloss of less than 1% for incident light at an incident angle of 60°, a gloss of less than 5% for incident light at an incident angle of 85°, a reflectance of less than 4% for light with a wavelength of 550 nm, an L value of less than 22 in the CIELAB color system measured by SCE method, and an optical concentration of more than 1.

0.

2. As in request item 1, the kit, wherein, (B2) Contains silicon dioxide.

3. As in request item 2, the kit, Silicon dioxide includes composite silicon dioxide that is blackened by coloring agents.

4. A kit as requested in any of items 1 through 3, wherein, (B1) contains carbon black.

5. As in request item 1, the kit, wherein, The surface of the film-forming surface has a maximum height Rz of 7 μm or more according to JIS B0601:2001, an average length Rsm of the profile curve elements of 80 μm or more, a skewness Rsk of the profile curve of 0.3 or less, and a kurtosis Rku of the profile curve of 3 or more.

6. The kit according to any one of claims 1 to 3 further comprises: a box body, which is a square cylindrical shape consisting of a front wall, a rear wall, and two side walls and is foldable; a cover body, which is a planar rectangular shape, with a thin-walled portion on one side connected to a thin-walled portion on the upper side of the box body, serving as the top plate of the box body, and can be opened and closed; and rollers, which are detachably disposed on the upper ends of the two side walls of the box body, and are wound around the middle portion of the back panel from the roll body that delivers the back panel into a roll, and pulled into the box body, thereby creating a photographic space inside the box body.

7. An anti-reflective film, which is a black anti-reflective film formed on a back panel, the back panel being used in a kit for constructing a photography studio for photographing a subject and disposed on the background of the subject in the shooting space, the anti-reflective film being composed of a film formed by spraying from a liquid composition with a thickness of 2 μm or more and 40 μm or less, the liquid composition comprising at least (A), (B) and (C), of which (B) comprises 20% to 60% by mass of (B) in 100% by mass of total solids, (B) comprises 90% to 90% by mass of (B1) and (B2), and the mass ratio of (B2) to (B1):1 is 1.8 to 3.3 or less; (A) is a resin component, (B) is an uneven particle, and (B1) is an inorganic small particle with a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less. (B2) refers to inorganic large particles with a particle diameter (d2) of 2 μm or more and 6 μm or less; (C) refers to a diluting solvent; the surface of the film has a gloss of less than 1% for incident light at an incident angle of 60°, a gloss of less than 5% for incident light at an incident angle of 85°, a reflectance of less than 4% for light with a wavelength of 550 nm, an L value of less than 22 in the CIELAB color system measured by SCE method, and an optical concentration of more than 1.0.

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