Compositions, optical components, optical filters, solid-state imaging devices, and camera modules

Abstract

The present invention provides an optical filter having a layer formed from the composition that exhibits excellent suppression of fluorescence generation, as well as excellent crack resistance and coating appearance. [Solution] A composition, optical member and optical filter, and a solid-state imaging device and camera module equipped with the optical filter, comprising (i) at least one structural unit selected from structural units derived from an N-substituted maleimide compound and structural units derived from a compound having a bridged alicyclic hydrocarbon group, and (ii) a structural unit derived from a compound having a (meth)acryloyl group (however, the structural unit relating to (ii) shall not include the structural unit relating to (i)), wherein the polymer 1 has a weight-average molecular weight (Mw) in terms of polystyrene, measured by gel permeation chromatography (GPC), of 50,000 to 1,500,000, an infrared absorber and a solvent.

Description

Technical Field

[0001] The present invention relates to a composition, an optical member and an optical filter, and a solid-state imaging device and a camera module using the optical filter.

Background Art

[0002] In solid-state imaging devices such as video cameras, digital still cameras, and mobile phones with camera functions, CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) image sensors, which are solid-state imaging elements for color images, are used. As these solid-state imaging elements, silicon photodiodes having sensitivity to near-infrared rays that cannot be perceived by the human eye are used in their light-receiving parts. In these solid-state imaging elements, it is necessary to perform visual sensitivity correction in order to make the obtained image have a natural color tone when viewed by the human eye, and an optical filter (e.g., near-infrared cut filter) that selectively transmits or cuts light rays in a specific wavelength region is often used.

[0003] As such a near-infrared cut filter, filters manufactured by various methods have been conventionally used. For example, in Patent Document 1, a transparent resin is used as a base material, and a squarylium-based dye is blended as a near-infrared absorbing dye in the transparent resin, and a near-infrared cut filter having a sufficient viewing angle and particularly suitable for use as a visual sensitivity correction filter for solid-state imaging elements such as CCDs and CMOSs is disclosed.

[0004] Further, Patent Document 2 discloses an optical filter in which a squarylium-based compound and a specific compound that absorbs or quenches fluorescence generated from the squarylium-based compound are used in combination as near-infrared absorbing dyes, and in which fluorescence transmission is low and transmittance characteristics are excellent.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2012-8532 [Patent Document 2] International Publication No. 2013 / 054864 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In recent years, with improvements in the performance of solid-state image sensors and the increase in quantum yield, using conventional optical filters has resulted in insufficient suppression of fluorescence that may be generated from the optical filter. This has led to image defects called flare, where the area around a light source of a specific wavelength appears in a color different from the actual color. Furthermore, due to their molecular structure, squarylium-based dyes generally tend to fluoresce easily, which can lead to fluorescence generation during light absorption or a decrease in camera image quality. While the aforementioned Patent Document 2 also investigates optical filters with low fluorescence transmission and excellent transmittance characteristics, further improvements are needed for optical filters that exhibit low fluorescence transmission and excellent transmittance characteristics.

[0007] As described above, optical filters capable of suppressing flare are known, but in recent years, the sensitivity of solid-state image sensors has improved, and it has been found that when the aforementioned conventional optical filters are used with such highly sensitive solid-state image sensors, flare cannot be sufficiently suppressed.

[0008] The problem that one embodiment of the present invention aims to solve is to provide an optical filter having a layer formed from the composition that exhibits excellent suppression of fluorescence generation, as well as excellent crack resistance and coating appearance. Furthermore, one embodiment of the present invention aims to solve the problem of providing an optical element and an optical filter that are excellent in suppressing fluorescence generation, as well as a solid-state imaging device and a camera module equipped with the optical filter. [Means for solving the problem]

[0009] As a result of diligent research to solve the aforementioned problems, the inventors of the present invention have found that the aforementioned problems can be solved by the following configuration example, and have completed the present invention. The means for solving the above problems include the following embodiments.

[0010] <1> A polymer 1 comprising (i) at least one structural unit selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups, and (ii) structural units derived from compounds having (meth)acryloyl groups (however, the structural units related to (ii) above do not include structural units corresponding to (i) above), and having a weight-average molecular weight (Mw) on a polystyrene basis of 50,000 to 1,500,000 as measured by gel permeation chromatography (GPC), Near-infrared absorber, Solvents and, A composition containing the following: <2> The substituent in the N-substituted maleimide compound is an alicyclic hydrocarbon group. <1> The composition described above. <3> The compound having the bridged alicyclic hydrocarbon group is a compound with 11 or fewer carbon atoms. <1> or <2> The composition described above. <4> The glass transition temperature (Tg) of polymer 1 is 130 to 200°C. <1> ~ <3> A composition as described in any one of the following. <5> The solvent comprises at least one compound selected from the group consisting of ketone compounds having 6 or fewer carbon atoms, ether compounds having 6 or fewer carbon atoms, and alkylene glycol monomethyl ether acetate compounds. <1> ~ <4> A composition as described in any one of the following. <6> The near-infrared absorber is at least one compound selected from the group consisting of squarylium compounds, phthalocyanine compounds, naphthalocyanine compounds, crokonium compounds, and polymethine compounds (excluding squarylium compounds, crokonium compounds, and cyanine compounds). <1> ~ <5> A composition as described in any one of the following. <7> <1> ~ <6> An optical member comprising an absorption layer 1 formed from any one of the compositions described in the Actual Composition. <8> The aforementioned absorption layer 1, A support disposed on the surface of the absorption layer 1, Equipped with, <7> Optical components as described above. <9> The support comprises a near-infrared absorbent and is an absorption layer 2 other than the absorption layer 1. <8> Optical components as described above. <10> The absorption layer 1 and the support further comprise an intermediate layer, <8> or <9> Optical components as described above. <11> <7> ~ <10> An optical component described in any one of the following, A dielectric multilayer film disposed on at least one surface of the optical member, An optical filter equipped with [specific features / features]. <12> <11> A solid-state imaging device equipped with the optical filter described above. <13> <11> A camera module equipped with the optical filter described above. [Effects of the Invention]

[0011] According to one embodiment of the present invention, an optical filter comprising a layer formed from the composition is provided that exhibits excellent suppression of fluorescence generation, as well as excellent crack resistance and coating appearance. Furthermore, according to one embodiment of the present invention, an optical member and an optical filter that exhibit excellent properties in suppressing fluorescence generation, as well as a solid-state imaging device and camera module equipped with the optical filter, are provided. [Modes for carrying out the invention]

[0012] The present invention will be described in detail below. It should be understood that the present invention is not limited to the embodiments described below, but also includes various modifications that do not alter the essence of the invention. In this specification, descriptions such as "A to B" that represent a numerical range are synonymous with "greater than or equal to A and less than or equal to B," and A and B are included within that numerical range. In this specification, the "~" indicating a numerical range means that the unit described on either side thereof indicates the same unit unless otherwise specified. Also, in this specification, the optical properties (e.g., transmittance, reflectance) at a wavelength of A~B nm represent the optical properties at a wavelength resolution of 1 nm in the wavelength range of A nm or more and B nm or less. In this specification, when referring to the amount of each component in a composition, in the case where there are a plurality of substances corresponding to each component in the composition, unless otherwise specified, it means the total amount of the plurality of substances present in the composition. In this specification, the combination of two or more preferred embodiments is a more preferred embodiment. In this specification, near-infrared light refers to light having a wavelength of 650~1700 nm, which is a wavelength with low human visual sensitivity among the detection wavelengths of silicon photodiodes, indium gallium arsenide photodiodes, etc.

[0013] 〔Composition〕 The composition according to the present invention contains (i) at least one structural unit selected from the structural unit derived from an N-substituted maleimide compound and the structural unit derived from a compound having a bridged alicyclic hydrocarbon group, and (ii) a structural unit derived from a compound having a (meth)acryloyl group (however, the structural unit according to (ii) does not include the structural unit corresponding to (i)), and contains a polymer 1 having a weight average molecular weight (Mw) in terms of polystyrene of 50,000~1,500,000 measured by gel permeation chromatography (GPC) method, a near-infrared absorber, and a solvent. In addition, the optical member provided with the absorption layer 1 formed from the composition according to the present invention is less likely to undergo alteration or the like due to the heat generated during vapor deposition or the like (that is, has excellent vapor deposition resistance) even when a layer such as a dielectric multilayer film is formed by vapor deposition or the like, and thus can be suitably used for an optical filter. Furthermore, by using an optical member including the absorption layer 1 formed from the composition according to the present invention as an optical filter, it is excellent in suppressing the occurrence of flare and the like, and can be suitably used for a solid-state imaging device, a solid-state imaging apparatus, etc. that can obtain a desired image. Furthermore, even when an organic coating layer for imparting scratch resistance and absorption performance is laminated on the optical member, an optical filter in which deterioration such as solvent cracking hardly occurs during coating is easily obtained.

[0014] Since the composition according to the present invention has the above-described configuration, it is excellent in crack resistance and coating appearance, so that an optical filter excellent in suppressing fluorescence generation can be obtained. The optical filter obtained from the composition according to the present invention is excellent in suppressing fluorescence generation, and particularly excellent in suppressing the occurrence of flare (pink flare) on the long wavelength region side. The reason why the composition according to the present invention exhibits the above effects is not necessarily clear, but the following mechanism is speculated. It is known that quenching by Förster-type energy transfer works more effectively as the intermolecular distance of the near-infrared absorber is closer. That is, if the absorbance per molecule (for example, the molar absorption coefficient measured at a concentration of 0.01% by mass) is about the same, the near-infrared absorber is at a high concentration, and in a layer that is a thin film, the absorption of near-infrared light can be significantly increased. The molar absorption coefficient measured at the concentration of 0.01% by mass (that is, the molar absorption coefficient when the concentration is sufficiently low and the intermolecular distance is far) is specifically obtained by preparing a dichloromethane solution having a concentration of 0.01% by mass and measuring the absorbance of the near-infrared absorber using a spectrophotometer (U-4100) manufactured by Hitachi High-Technologies Corporation and using a cell having an optical path width of 10 mm. In order to form a layer in a state where the concentration of the near-infrared absorber is high and the layer is a thin film, it is required to use a polymer having excellent compatibility with the near-infrared absorber and to be such that cracks hardly occur even in the thin film (the obtained layer is excellent in crack resistance). Further, as the composition, it is required that warping of the coating surface and roughness of the coating surface hardly occur when forming the layer. As a result of diligent research, the present inventors have found that when using a composition for forming a layer that includes polymer 1 comprising (i) at least one selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups, and (ii) structural units derived from compounds having (meth)acryloyl groups (however, the structural units related to (ii) shall not include structural units corresponding to (i)), if the molecular weight of polymer 1 is too low, the crack resistance tends to be poor, and if the molecular weight is too high, the compatibility with near-infrared absorbers tends to decrease. The composition according to the present invention comprises, as polymer 1, (i) at least one structural unit selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups, and (ii) structural units derived from compounds having (meth)acryloyl groups (however, the structural units related to (ii) shall not include structural units corresponding to (i)), and the weight-average molecular weight (Mw) of polymer 1 is 50,000 to 1,500,000. Since the aforementioned composition contains the polymer 1 having a specific structure with a weight-average molecular weight (Mw) of 50,000 or more, the layer formed from the composition exhibits excellent crack resistance. Furthermore, since the molecular weight of polymer 1 is 1,500,000 or less, polymer 1 and the near-infrared absorber are considered to be mutually compatible. Therefore, it is presumed that this composition has excellent coating properties when forming a layer, excellent appearance after coating, and that an optical filter having a layer formed from this composition has excellent optical properties such as suppression of fluorescence generation. The following describes each component that makes up the composition.

[0015] <<Polymer 1>> Polymer 1 of the present invention comprises (i) at least one structural unit selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups, and (ii) structural units derived from compounds having (meth)acryloyl groups (however, the structural units related to (ii) above do not include structural units corresponding to (i) above), and has a weight-average molecular weight (Mw) on a polystyrene basis measured by gel permeation chromatography (GPC) method of 50,000 to 1,500,000.

[0016] Polymer 1 may contain (i) at least one structural unit selected from structural units derived from an N-substituted maleimide compound and structural units derived from a compound having a bridged alicyclic hydrocarbon group, and may contain both structural units derived from an N-substituted maleimide compound and structural units derived from a compound having a bridged alicyclic hydrocarbon group, or may contain only one of the structural units derived from an N-substituted maleimide compound and structural units derived from a compound having a bridged alicyclic hydrocarbon group.

[0017] [N-substituted maleimide compounds] Examples of substituents in N-substituted maleimide compounds include aliphatic hydrocarbon groups. These aliphatic hydrocarbon groups may be linear, branched, or cyclic, and may be saturated or unsaturated hydrocarbon groups. Among these, alicyclic hydrocarbon groups are preferred substituents in N-substituted maleimide compounds. Examples of alicyclic hydrocarbon groups include alicyclic hydrocarbon groups having 3 to 20 carbon atoms. The alicyclic hydrocarbon group having 3 to 20 carbon atoms may be saturated or unsaturated, and may be monocyclic or polycyclic. The polycyclic group may be bridged polycyclic or spirocyclic. There are no particular restrictions on the number of ring members of the alicyclic hydrocarbon group, but it is preferably 3 to 14, more preferably 3 to 8, and even more preferably 3 to 6. The alicyclic hydrocarbon group having 3 to 20 carbon atoms is preferably an alicyclic hydrocarbon group having 3 to 14 carbon atoms, more preferably an alicyclic hydrocarbon group having 3 to 12 carbon atoms, even more preferably an alicyclic alkyl group having 3 to 10 carbon atoms, and particularly preferably an alicyclic alkyl group having 3 to 8 carbon atoms.

[0018] Examples of the above-mentioned alicyclic hydrogen groups having 3 to 20 carbon atoms include cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclopentenyl group, cyclohexyl group, t-butylcyclohexyl group, cycloheptyl group, cyclooctyl group, 1-cyclohexenyl group, norbornane group, and adamantyl group. Among these, the cyclohexyl group is preferred as the alicyclic hydrogen group having 3 to 20 carbon atoms.

[0019] Examples of N-substituted maleimide compounds include N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-isopropylmaleimide, Nt-butylmaleimide, N-cyclohexylmaleimide, N-octylmaleimide, N-2-ethylhexylmaleimide, N-phenylmaleimide, N-benzylmaleimide, and N-naphthylmaleimide. Among these, N-benzylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide are preferred as N-substituted maleimide compounds from the viewpoint of excellent heat resistance. Furthermore, N-cyclohexylmaleimide (CHMI) is more preferred as an N-substituted maleimide compound from the viewpoint of excellent heat color resistance.

[0020] [Compounds containing bridged alicyclic hydrocarbon groups] The bridged alicyclic hydrocarbon group is not particularly limited as long as it is a cyclic hydrocarbon group having a crosslinking structure, and examples include norbornyl group, norvonylmethyl group, hydroxynorbornyl group, tricyclodecanyl group, and adamantyl group. Examples of compounds having the above-mentioned bridged alicyclic hydrocarbon group include adamantane, hydroxyadamantane, tricyclopentane, norbornene, and tricyclo[5.2.1.02,6 Examples include bridged alicyclic hydrocarbon compounds such as decane and bicyclo[2.2.2]octane; and (meth)acrylates having bridged alicyclic hydrocarbon groups such as isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate, tricyclodecanyl (meth)acrylate, adamantyl (meth)acrylate, 3,5-dimethyladamantyl (meth)acrylate, and 3-tetracyclododecyl (meth)acrylate. Compounds having a bridged alicyclic hydrocarbon group are preferably those with 12 or fewer carbon atoms, and more preferably those with 11 or fewer carbon atoms. The lower limit of the carbon number of compounds having a bridged alicyclic hydrocarbon group is preferably 7 or more carbon atoms. Among these, from the viewpoint of having good crack resistance and fluorescent lamp exposure resistance in the layer formed from the composition, adamantane, hydroxyadamantane, or adamantyl (meth)acrylate are preferred as the compound having a bridged alicyclic hydrocarbon group.

[0021] [Compounds containing a (meth)acryloyl group] Polymer 1 includes (ii) structural units derived from a compound having a (meth)acryloyl group (however, the structural units related to (ii) above do not include structural units corresponding to (i) above). The statement "(ii) does not include structural units that fall under (i) above" means, for example, that structural units derived from compounds having a (meth)acryloyl group and a bridged alicyclic hydrocarbon group, such as adamantyl (meth)acrylate, are structural units derived from compounds having a bridged alicyclic hydrocarbon group, i.e., fall under (i) above, and therefore are not included in (ii) structural units derived from compounds having a (meth)acryloyl group. Examples of compounds having a (meth)acryloyl group include (meth)acrylic acid; Alkyl (meth)acrylates such as methyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and lauryl (meth)acrylate; Alicyclic (meth)acrylates such as cyclohexyl (meth)acrylate and (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate (CCMA); Aryl (meth)acrylates such as phenyl (meth)acrylate; Aralkyl(meth)acrylates such as benzyl(meth)acrylate; Alkoxy(poly)alkylene glycol (meth)acrylate; Examples include cyano group-containing (meth)acrylates such as allyloxy(poly)alkylene glycol (meth)acrylate and (meth)acrylonitrile. Alicyclic (meth)acrylates are ester compounds of a compound having an aliphatic ring structure and (meth)acrylic acid. The hydroxyl group involved in the esterification reaction in the compound having an aliphatic ring structure may be directly connected to the aliphatic ring structure or to a structure other than the aliphatic ring structure. The aliphatic ring structure may be an aliphatic heterocyclic structure containing a heteroatom in the ring. From the viewpoint of superior heat resistance to coloring and affinity with near-infrared absorbers, the compound having a (meth)acryloyl group is preferably an alkyl (meth)acrylate or an alicyclic (meth)acrylate, more preferably an alkyl (meth)acrylate having 5 to 20 carbon atoms or an alicyclic (meth)acrylate having 3 to 12 carbon atoms forming an alicyclic ring, and even more preferably an alkyl (meth)acrylate having 5 to 18 carbon atoms or an alicyclic (meth)acrylate having 3 to 8 carbon atoms forming an alicyclic ring.

[0022] [Other structures] Polymer 1 may contain structural units derived from compounds other than the above-mentioned (i)N-substituted maleimide compounds, compounds having a bridged alicyclic hydrocarbon group, and compounds having a (meth)acryloyl group (hereinafter also simply referred to as "other compounds"), as long as they do not interfere with the effects of the present invention. Other compounds include, for example, dialkyl maleate esters and other unsaturated dialkyl dicarboxylic acids; and aromatic compounds having ethylenically unsaturated bonds, such as styrene, α-methylstyrene, o,m or p-methylstyrene, and o,m or p-methoxystyrene.

[0023] The content of structural units derived from other compounds is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less, based on 100% by mass of the total of (i) structural units selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups in polymer 1, and (ii) structural units derived from compounds having acryloyl groups (however, the structural units related to (ii) above do not include structural units corresponding to (i) above). Structural units derived from other compounds may be included in polymer 1 either individually or in combination of two or more types.

[0024] [Weight-average molecular weight (Mw) of polymer 1] The weight-average molecular weight (Mw) of polymer 1, measured by gel permeation chromatography (GPC), is 50,000 to 1,500,000, preferably 200,000 to 700,000. When the weight-average molecular weight (Mw) of polymer 1 is 50,000 or more, it exhibits high toughness and superior crack resistance. When the weight-average molecular weight (Mw) of polymer 1 is 1,500,000 or less, the viscosity of the coating solution does not become too high, resulting in excellent coating properties. The weight-average molecular weight (Mw) is determined by the measurement method described in the examples below.

[0025] [Glass transition temperature of polymer 1] The glass transition temperature (Tg) of polymer 1 is preferably 130 to 205°C, more preferably 150 to 190°C, even more preferably 150 to 185°C, and particularly preferably 150 to 170°C. When the glass transition temperature (Tg) of polymer 1 is 130°C or higher, it exhibits excellent heat resistance and can suppress whitening (i.e., deterioration of appearance) of the optical filter obtained during the vapor deposition process. The glass transition temperature (Tg) is determined by the measurement method described in the examples below. When polymer 1 is applied to the surface of the absorption layer 2 (resin), which will be described later, the higher the glass transition temperature (Tg) of the coating film, the greater the internal stress, which may cause warping of the optical filter. From the viewpoint of suppressing warping of the optical filter, when polymer 1 is applied to the surface of the absorption layer 2 (resin), which will be described later, it is preferable that the glass transition temperature (Tg) is within the temperature range described above.

[0026] [Ratio of N-substituted maleimide compounds and compounds having an acryloyl group] In polymer 1, the ratio of structural units derived from the N-substituted maleimide compound to structural units derived from the compound having an acryloyl group (structural units derived from the N-substituted maleimide compound: structural units derived from the compound having an acryloyl group) is preferably 90:10 to 30:70 by mass, and more preferably 60:40 to 40:60. When the content ratio of structural units derived from the N-substituted maleimide compound in polymer 1 is within the above range, the decrease in the glass transition temperature (Tg) of polymer 1 can be suppressed, and an optical filter with excellent heat resistance can be obtained.

[0027] [Ratio of compounds having bridged alicyclic hydrocarbon groups and compounds having acryloyl groups] In polymer 1, the ratio of structural units derived from a compound having a bridged alicyclic hydrocarbon group to structural units derived from a compound having an acryloyl group (structural units derived from a compound having a bridged alicyclic hydrocarbon group: structural units derived from a compound having an acryloyl group) is preferably 30:70 to 90:10 by mass, and more preferably 40:60 to 80:20. If the content ratio of structural units derived from compounds having bridged alicyclic hydrocarbon groups in polymer 1 is within the above range, the decrease in the glass transition temperature (Tg) of polymer 1 can be suppressed, and an optical filter with excellent heat resistance can be obtained.

[0028] The content of polymer 1 is preferably 5 to 30% by mass, and more preferably 8 to 20% by mass, based on the total mass of the composition. Polymer 1 may be used alone or in combination of two or more types.

[0029] <Near-infrared absorber> There are no particular restrictions on the near-infrared absorber; it may be either an inorganic compound or / or an organic compound. As near-infrared absorbers, various known compounds used as dyes and pigments can be used, for example. Specific examples of near-infrared absorbers include azo compounds, azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, quinophthalone compounds, coumarin compounds, dipyromethene compounds, pyrrolopyrrole compounds, diketopyrrolopyrrole compounds, diphenylmethane compounds, triarylmethane compounds, xanthene compounds, acridine compounds, polymethine compounds, oxonol compounds, merocyanine compounds, allylidene compounds, benzylidene compounds, cyanine compounds, squarylium compounds, crokonium compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, naphthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, their metal chelates, metal dithiolate compounds, copper complex compounds, and iron complex compounds. Furthermore, polymethine compounds are polymethine compounds excluding oxonol compounds, merocyanine compounds, allylidene compounds, benzylidene compounds, cyanine compounds, squarylium compounds, and crokonium compounds, while phthalocyanine compounds are phthalocyanine compounds excluding porphyrin compounds and tetraazaporphyrin compounds. Among these, the near-infrared absorber is preferably at least one compound selected from the group consisting of squarylium compounds, phthalocyanine compounds, naphthalocyanine compounds, crokonium compounds, and polymethine compounds (however, squarylium compounds, crokonium compounds, and cyanine compounds are not included), more preferably at least one compound selected from the group consisting of squarylium compounds and polymethine compounds, and even more preferably a polymethine compound.

[0030] The near-infrared absorber preferably has an absorption maximum wavelength of 650 to 900 nm, more preferably 700 to 840 nm. The specific structures of near-infrared absorbers are described, for example, in "New Edition Dye Handbook" (edited by the Society of Synthetic Organic Chemistry; Maruzen, 1970) and "Pigment Handbook" (edited by Okawara et al.; Kodansha, 1986).

[0031] From the viewpoint of superior suppression of fluorescence emission, the content of the near-infrared absorber (total amount if two or more types of near-infrared absorbers are included) is preferably 1 to 20 parts by mass, and more preferably 3 to 10 parts by mass, per 100 parts by mass of polymer 1. Near-infrared absorbing agents may be used individually or in combination of two or more types.

[0032] <Solvent> There are no particular restrictions on the solvent, and known solvents used in the manufacture of optical filters are examples. Preferably, the solvent contains at least one compound selected from the group consisting of ketone compounds having 6 or fewer carbon atoms, ether compounds having 6 or fewer carbon atoms, and alkylene glycol monomethyl ether acetate compounds.

[0033] Examples of ketone compounds with six or fewer carbon atoms include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone. Examples of ether compounds with six or fewer carbon atoms include diethyl ether, tetrahydrofuran, 1,3-dioxolane, tetrahydropyran, and 4-methyltetrahydropyran. Examples of alkylene glycol monomethyl ether acetate compounds include ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, and diethylene glycol monomethyl ether acetate.

[0034] From the viewpoint of excellent solubility and liquid storage stability of polymer 1, the solvent preferably contains at least one compound selected from the group consisting of ketone compounds having 6 or fewer carbon atoms and ether compounds having 6 or fewer carbon atoms, and more preferably contains both ketone compounds having 6 or fewer carbon atoms and ether compounds having 6 or fewer carbon atoms. Furthermore, methyl ethyl ketone and 1,3-dioxolane are even more preferred as combinations of ketone compounds having 6 or fewer carbon atoms and ether compounds having 6 or fewer carbon atoms.

[0035] The solvent content is preferably 200 to 2000 parts by mass, and more preferably 500 to 1000 parts by mass, per 100 parts by mass of polymer 1. The solvent may be used alone or in combination of two or more types.

[0036] <Other additives> The composition may also contain compounds other than the polymer 1, the near-infrared absorber, and the solvent (hereinafter sometimes referred to as "other additives"). Other additives include, for example, leveling agents such as silicone-based surfactants and fluorine-based surfactants, silane coupling agents as adhesion enhancers when laminating to glass, and antioxidants. Other additives may be used individually or in combination of two or more. The content of other additives is preferably 10 parts by mass or less, and more preferably 5 parts by mass or less, per 100 parts by mass of polymer 1.

[0037] <<Method for preparing the composition>> The method for preparing the composition is not particularly limited as long as the above components can be mixed uniformly, and it can be prepared using known methods.

[0038] [Optical components] The optical member according to the present invention comprises an absorption layer 1 formed from the above composition, and preferably comprises the absorption layer 1 and a support disposed on the surface of the absorption layer 1. The following describes in detail each component of the optical element.

[0039] <<Absorption layer 1>> The absorption layer 1 is a layer formed from the above composition. In the optical member according to the present invention, the absorption layer 1 may be in contact with the support described later, or other layers may be disposed between the absorption layer 1 and the support. Examples of other layers include adhesive layers. The absorption layer 1 is preferably in contact with the support described later. The thickness of the absorption layer 1 is preferably 3 to 20 μm, and more preferably 5 to 10 μm.

[0040] There are no particular restrictions on the method for forming the absorption layer 1, and the above composition may be applied by known coating methods. Examples of such coating methods include spray coating, roll coating, rotary coating (spin coating), slit die coating (slit coating), and bar coating.

[0041] <<Support>> As the support, known supports used in optical filters can be used, such as absorption glass and PET (polyethylene terephthalate) plates. Alternatively, the support may be the absorption layer 2 described later. Examples of absorbing glass include phthalate-based glass and near-infrared absorbing glass (absorbing glass made by adding CuO, etc., to phosphate-based glass, etc.). From the viewpoint of obtaining an optical filter with superior fluorescence emission suppression, it is preferable that the support material contains a near-infrared absorbent and is an absorption layer 2 other than the absorption layer 1 described above. If the support contains a near-infrared absorbent and the absorption layer 2 is different from the absorption layer 1 described above, the fluorescence generated in absorption layer 1 (fluorescence that could not be completely extinguished by Förster-type energy transfer) can be absorbed by absorption layer 2, and an optical filter equipped with such a support is superior in suppressing fluorescence emission.

[0042] <<Absorption layer 2>> Absorbent layer 2 contains a near-infrared absorbent and is not particularly limited as long as it is a layer other than absorbent layer 1. Preferably, absorbent layer 2 is an absorbent layer formed from a composition containing polymer 2 and a near-infrared absorbent, as described later.

[0043] [polymer2] The polymer 2 contained in the absorption layer 2 is not particularly limited as long as it does not impair the effects of the present invention. However, a resin having a glass transition temperature (Tg) of preferably 110 to 380°C, more preferably 110 to 370°C, and even more preferably 120 to 360°C is preferred, as it ensures thermal stability and moldability of the layer, and has excellent vapor deposition resistance, and in particular, it is possible to easily obtain a layer that can form a dielectric multilayer film by high-temperature vapor deposition carried out at a vapor deposition temperature of about 100°C or higher. Furthermore, when polymer 2 is a resin with a glass transition temperature (Tg) of 140°C or higher, a layer with superior vapor deposition resistance can be obtained, and in particular, a layer that can form a dielectric multilayer film at a higher temperature, which is especially preferable. Examples of such polymers 2 include cyclic (poly)olefin polymers, polyether polymers, polyimide polymers, polyester polymers, polycarbonate polymers, polyamide (aramid) polymers, polyarylate polymers, polysulfone polymers, polyethersulfone polymers, poly(para)phenylene polymers, polyamide-imide polymers, polyethylene naphthalate (PEN) polymers, fluorinated aromatic polymer polymers, (modified) (meth)acrylic polymers, and epoxy polymers. Among these, cyclic (poly)olefin polymers and polyarylate polymers are preferred as resin 2.

[0044] The content of polymer 2 is preferably 30 to 98% by mass, and more preferably 50 to 90% by mass, based on the total mass of the composition used to form the absorbent layer 2. Polymer 2 may be a single type or a combination of two or more types.

[0045] [Near-infrared absorber] The near-infrared absorbent used to form the absorption layer 2 is the same as the near-infrared absorbent contained in the above-described composition, and the preferred embodiment is also the same.

[0046] The content of the near-infrared absorbent is preferably 0.03 to 10% by mass, and more preferably 0.1 to 1% by mass, relative to the total mass of the composition used to form the absorption layer 2. Near-infrared absorbing agents may be used individually or in combination of two or more types.

[0047] [Other additives] The composition used to form the absorption layer 2 may contain compounds other than the polymer 2 and the near-infrared absorber (hereinafter also referred to as "other additives"). Other additives are not particularly limited and include, for example, antioxidants, ultraviolet absorbers, fluorescent quenchers, and metal complex compounds. Other additives may be used individually or in combination of two or more.

[0048] The thickness of the absorption layer 2 is not particularly limited as long as it does not affect the effects of the present invention, but is preferably 30 to 300 μm, and more preferably 50 to 200 μm.

[0049] One method for forming the absorption layer 2 is to prepare a composition containing the polymer 2 used for forming the absorption layer 2, a near-infrared absorber, and other additives as needed, and then apply this composition. Known coating methods can be used to apply the above composition, including, for example, spray coating, roll coating, rotary coating (spin coating), slit die coating (slit coating), and bar coating.

[0050] <Middle class> The optical member may further include an intermediate layer between the absorption layer 1 and the support. The intermediate layer is not particularly limited as long as it is transparent across the entire wavelength range. Preferably, the intermediate layer is formed from a curable resin composition containing, for example, a coating agent such as an anti-reflective agent, a hard coat agent, and / or an antistatic agent. Examples of curable resin compositions containing the above-mentioned coating agent include vinyl-based, urethane-based, urethane acrylate-based, acrylate-based, isocyanurate group-containing acrylate-based, epoxy-based, and epoxy acrylate-based curable resin compositions.

[0051] There are no particular restrictions on the method for forming the intermediate layer. For example, one method involves applying a curable resin composition containing the above-mentioned coating agent onto the absorption layer 2 using a bar coater or the like, and then curing it by ultraviolet irradiation or the like to form the intermediate layer. The thickness of the intermediate layer is preferably 0.5 to 10 μm, and more preferably 1 to 5 μm.

[0052] [Optical filters] The optical filter according to the present invention preferably comprises the optical member and a dielectric multilayer film disposed on at least one surface of the optical member.

[0053] <<Dielectric Multilayer Film>> By incorporating a dielectric multilayer film into the optical filter, it is possible to easily obtain an optical filter with low near-infrared transmittance. There are no particular restrictions on the number of dielectric multilayer films in an optical filter; it may be one or two or more. The entire dielectric multilayer film exhibiting the desired optical properties (e.g., the entire 22 layers of Design 1 in the example described later) is referred to as one dielectric multilayer film. Furthermore, the portion of the optical filter other than the dielectric multilayer film is sometimes referred to as the "absorption laminate."

[0054] The dielectric multilayer film may be placed on at least one surface of the optical component, on one side of the optical filter, or on both sides of the optical filter. When the dielectric multilayer film is placed on one surface of the optical filter, the optical filter offers excellent manufacturing cost and ease of manufacture. When the dielectric multilayer film is placed on both surfaces of the optical filter, it is possible to easily obtain an optical filter with high strength and low warping.

[0055] The dielectric multilayer film is preferably a film that has the ability to reflect near-infrared light. The dielectric multilayer film is such that, in the wavelength range of 650 to 1700 nm, the average reflectance of unpolarized light incident at an angle of 5° from the direction perpendicular to the dielectric multilayer film surface is preferably 80% or more, more preferably 90% or more.

[0056] In this specification, the average reflectance of wavelengths A to B nm refers to the value calculated by measuring the reflectance at each wavelength in 1 nm increments from An nm to B nm, and dividing the sum of these reflectances by the number of measured reflectances (wavelength range, B - A + 1). Since measuring the reflectance of unpolarized light incident from the vertical is extremely difficult, this specification determines it by measuring the reflectance characteristics of unpolarized light incident from a 5° angle from the vertical.

[0057] In this specification, "unpolarized light" refers to light rays that do not have a polarization direction bias, and means a collection of waves in which the electric field is distributed approximately uniformly in all directions. The "average transmittance of unpolarized light" may be the average of the "average transmittance of S-polarized light" and the "average transmittance of P-polarized light." The "average reflectance of unpolarized light" may be the average of the "average reflectance of S-polarized light" and the "average reflectance of P-polarized light."

[0058] Furthermore, it is preferable that the dielectric multilayer film has a reflectivity of 80% or more to light of any wavelength between 800 and 1200 nm, incident at an angle of 5° from the direction perpendicular to the dielectric multilayer film surface. In particular, when using an optical filter in an imaging device, it is preferable to place an optical filter having a dielectric multilayer film with a reflectivity of 80% or more to light of any wavelength between 800 and 1200 nm on the sensor (image sensor) side.

[0059] Examples of the dielectric multilayer film include a laminate in which high refractive index material layers and low refractive index material layers are alternately stacked.

[0060] As the material constituting the high refractive index material layer, a material with a refractive index of 1.7 or higher can be used, and a material with a refractive index in the range of 1.75 to 2.5 is usually selected. Examples of such materials include at least one selected from titanium oxide, zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide, and indium oxide.

[0061] Materials with a refractive index of less than 1.7 can be used to constitute the low refractive index layer, and materials with a refractive index in the range of 1.2 to 1.6 are usually selected. Examples of such materials include at least one selected from silica, alumina, lanthanum fluoride, magnesium fluoride, and sodium aluminum hexafluoride. Among these, materials with a lower refractive index are preferred, and at least one selected from silica and magnesium fluoride is preferred.

[0062] There are no particular limitations on the method for stacking the high refractive index material layer and the low refractive index material layer, as long as a dielectric multilayer film is formed by stacking these material layers. For example, a dielectric multilayer film can be formed by directly stacking the high refractive index material layer and the low refractive index material layer alternately on the absorption laminate using methods such as CVD (Chemical Vapor Deposition), sputtering, vacuum deposition, ion-assisted deposition, or ion plating.

[0063] Furthermore, if warping occurs in the resulting optical filter after the formation of the dielectric multilayer film, this can be resolved by forming the dielectric multilayer film on both sides of the optical filter or by irradiating the dielectric multilayer film surface with electromagnetic waves such as ultraviolet light. When irradiating with electromagnetic waves, the electromagnetic waves may be irradiated during the formation of the dielectric multilayer film, or they may be irradiated separately after the dielectric multilayer film has been formed.

[0064] The thickness of each of these high-refractive-index and low-refractive-index material layers is usually preferably between 0.1λ and 0.5λ, where λ (nm) is the near-infrared wavelength to be blocked. When the thickness is within this range, the optical film thickness, calculated by the product of refractive index (n) and film thickness (d) (n × d) as λ / 4, is approximately the same as the thickness of each of the high-refractive-index and low-refractive-index material layers. This tends to allow for easy control of blocking and transmission of specific wavelengths based on the relationship between the optical properties of reflection and refraction. Furthermore, each of these high-refractive-index material layers and low-refractive-index material layers may have a thickness other than 0.1λ to 0.5λ. Such layers with thicknesses other than 0.1λ to 0.5λ are particularly preferably found in the 10 layers near the absorption laminate or in the outermost layer of the dielectric multilayer film.

[0065] The total number of layers of high refractive index material layers and low refractive index material layers in a dielectric multilayer film is preferably 5 to 60 layers, more preferably 6 to 50 layers.

[0066] <Overcoat layer> The optical filter may have an overcoat layer on at least one surface of the optical component for purposes such as improving surface hardness, chemical resistance, antistatic properties, and scratch removal.

[0067] The overcoat layer is preferably a layer made of a composition containing a curable resin (hereinafter sometimes referred to as the "curable resin composition"). The curable resin may be a resin that hardens by the action of either heat or light. Examples of curable resins include epoxy resins, allyl ester-based curable resins, silsesquioxane-based photocurable resins, acrylic-based photocurable resins, and vinyl-based photocurable resins. Preferred curable resins include epoxy resins, silsesquioxane-based photocurable resins, and acrylic-based photocurable resins.

[0068] The curable resin composition preferably contains a polymerization initiator. Known photopolymerization initiators or thermal polymerization initiators can be used as the polymerization initiator, and a combination of photopolymerization initiators and thermal polymerization initiators may be used. The polymerization initiator may be used alone or in combination of two or more types. The content of the polymerization initiator in the curable resin composition is preferably 0.1 to 10% by mass, more preferably 0.5 to 10% by mass, and even more preferably 1 to 5% by mass, when the total amount of the curable resin composition is 100% by mass. When the polymerization initiator content is within the aforementioned range, a curable resin composition with excellent curing properties and handling characteristics can be easily obtained, and an overcoat layer with the desired hardness can be easily obtained.

[0069] Furthermore, an organic solvent may be added to the curable resin composition as a solvent, and any known organic solvent can be used as the organic solvent. Specific examples of the organic solvent include alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; esters such as ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate; ethers such as ethylene glycol monomethyl ether and diethylene glycol monobutyl ether; aromatic hydrocarbons such as benzene, toluene, and xylene; and amides such as dimethylformamide, dimethylacetamide, and N-methylpyrrolidone. These solvents may be used individually or in combination of two or more types.

[0070] The curable resin composition may contain leveling agents and defoaming agents as additives. The inclusion of additives in the curable resin composition facilitates the production of the overcoat layer. Each of these additives may be used individually or in combination of two or more.

[0071] The thickness of the overcoat layer is preferably 0.1 to 20 μm, more preferably 0.5 to 10 μm, and even more preferably 0.7 to 5 μm. When the thickness of the overcoat layer is within the aforementioned range, the occurrence of unevenness in the formation of the overcoat layer can be easily suppressed, and the total thickness of the optical filter can be reduced.

[0072] There are no particular restrictions on the method for forming the overcoat layer; the composition containing the curable resin can be applied by known application methods. Examples of such application methods include spraying, roll coating, rotary coating (spin coating), slit die coating (slit coating), and bar coating. An optical filter may have only one overcoat layer or it may have two overcoat layers.

[0073] [Solid-state imaging device] The solid-state imaging device according to the present invention includes the optical filter described above. Here, the solid-state imaging device is an image sensor equipped with a solid-state image element such as a CCD or CMOS image sensor, and can be used in applications such as digital still cameras, smartphone cameras, mobile phone cameras, wearable device cameras, and digital video cameras. Furthermore, it is also useful as a heat-cutting filter attached to glass in automobiles, buildings, etc.

[0074] [Turf Module] The camera module according to the present invention includes the above-mentioned optical filter. Since the above-mentioned optical filter has a wide field of view and excellent near-infrared cut capability, it can be suitably used as a filter for correcting the visual sensitivity of a solid-state image sensor such as a CCD or CMOS image sensor in a camera module. In particular, it is useful in solid-state imaging devices such as digital still cameras, mobile phone cameras, digital video cameras, PC cameras, surveillance cameras, and automotive cameras, as well as in televisions, car navigation systems, personal digital assistants, personal computers, video games, portable game consoles, fingerprint authentication systems, and digital music players. Furthermore, it is also useful as a heat-cutting filter attached to glass in automobiles, buildings, etc. [Examples]

[0075] The present invention will be described in detail below based on examples, but the present invention is not limited to these examples.

[0076] (spectral transmittance) The transmittance of the optical filters obtained in the following examples or comparative examples in each wavelength range was measured using a spectrophotometer (U-4100) manufactured by Hitachi High-Tech Corporation.

[0077] <Glass transition temperature (Tg)> Measurements were taken using a differential scanning calorimeter (DSC250) manufactured by TA Instrument, at a heating rate of 20°C per minute, under a nitrogen atmosphere.

[0078] <Near infrared (NIR) shielding performance> The transmittance of optical elements or dielectric multilayer films fabricated in the following examples and comparative examples was measured at wavelengths of 700 nm to 800 nm, and the near-infrared (NIR) shielding performance was evaluated according to the following evaluation criteria. If the NIR shielding performance is evaluated as "○" or "△", it can be judged that the shielding performance against near-infrared rays is excellent. If the NIR shielding performance is evaluated as "△", it can be said that the shielding performance against near-infrared rays is slightly inferior to that of "○", but is at a level that does not pose a practical problem. If the NIR shielding performance is evaluated as "×", it can be judged that the shielding performance against near-infrared rays is poor. -Evaluation Criteria- "〇": The average transmittance in the wavelength range of 700nm to 800nm ​​was less than 0.3%. "△": The average transmittance at wavelengths of 700nm to 800nm ​​was between 0.3% and less than 0.5%. "×": The average transmittance in the wavelength range of 700nm to 800nm ​​was 0.5% or higher.

[0079] <Interlayer adhesion> For the optical components prepared in the following examples and comparative examples, the surface of absorption layer 1 was cross-cut into a 10mm x 10mm grid (100 squares) (cut so as to reach absorption layer 2). Cellophane tape was attached to this grid and peeled off at a 90° angle to the optical component surface. The number of squares on which the coating remained attached to the optical component was visually confirmed, and the adhesion was evaluated according to the evaluation criteria below. If the adhesion evaluation is "○" or "△", it can be judged that the adhesion is excellent. If the adhesion evaluation is "△", it can be said that the adhesion is slightly inferior to that of "○", but is at a level that does not cause practical problems. If the adhesion evaluation is "×", it can be judged that the adhesion is poor. -Evaluation Criteria- "〇": The number of squares that remained without peeling off from the optical component was 100. "△": The number of squares that remained without peeling off from the optical component was between 10 and 99. "×": The number of squares remaining without detaching from the optical component was between 0 and 9.

[0080] <Suppression of fluorescence generation> The fluorescence suppression performance of the optical filter was evaluated using flare images. First, the near-infrared cut filter located between the lens and the solid-state image sensor in the camera module of an OPPO FindX10 smartphone was removed, and then the dielectric multilayer optical filter obtained in the following example or comparative example was installed. Subsequently, a camera module having a solid-state image sensor equipped with the dielectric multilayer optical filter was fabricated by soldering the wiring. The fabricated camera module was then installed back into the FindX10 smartphone. In a darkroom, a halogen lamp (Osram JS12V20W-AXS), which served as the light source, was imaged using the FindX10 smartphone from a distance of 3m from the light source. The captured image was split into 256 levels of red, blue, and green intensity. The area of ​​the region in the captured image where the red or blue intensity around the light source was 1.2 times stronger than the green intensity and had 20 or more levels was defined as the R flare, and the area of ​​the region where the intensity of any of the red, blue, or green was 150 or more levels was defined as the R light source. The area of ​​the R flare to the R light source area (R flare / R light source) was evaluated for its ability to suppress fluorescence generation according to the evaluation criteria below. If the R flare / R light source value is less than 0.1, or if it is between 0.1 and 0.5, it can be determined that the fluorescence emission suppression is excellent. -Evaluation Criteria- "◎": The R flare / R light source value was less than 0.1. "○": The R flare / R light source value was between 0.1 and less than 0.5. "×": The R flare / R light source value exceeded 0.5.

[0081] <Vapor deposition resistance (NIR (near-infrared) absorption)> The transmittance at 700 nm was measured for the optical components fabricated in the examples and comparative examples described later, and for the optical filters with dielectric multilayer films attached thereto. The absorbance calculated from this transmittance was evaluated for vapor deposition resistance according to the evaluation criteria below. If the vapor deposition resistance evaluation is "○" or "△", it can be judged that the vapor deposition resistance is excellent. If the vapor deposition resistance evaluation is "△", it can be said that the vapor deposition resistance is slightly inferior to that of "○", but is at a level that does not cause practical problems. If the vapor deposition resistance evaluation is "×", it can be judged that the vapor deposition resistance is poor. -Evaluation Criteria- "〇": The ratio of (absorbance of the optical filter at 700nm) / (absorbance of the substrate at 700nm) was 0.9 or higher. "△": The ratio of (absorbance of optical filter at 700nm) / (absorbance of substrate at 700nm) was 0.8 or higher and less than 0.9. "×": The ratio of (absorbance of optical filter at 700nm) / (absorbance of substrate at 700nm) was less than 0.8.

[0082] (Appearance of the coating) In the fabrication of optical components in the examples and comparative examples described later, after applying the absorption layer 1 solution, the coated surface was visually observed and its appearance was evaluated according to the evaluation criteria below. If the evaluation of the coated surface appearance is "○" or "△", it can be determined that the coated surface has a good appearance and is excellent. -Evaluation Criteria- "〇": The coated surface showed no warping or roughness, and was usable. "△": Slight warping or partial surface roughness was observed on the coated surface, but it was at a level that did not pose a practical problem. "×": Significant warping was observed on the coated surface, or overall surface roughness was observed on the coated surface, making it unusable.

[0083] <Crack resistance> In the fabrication of the optical components in the examples and comparative examples described later, after coating the absorption layer 1 with the OC1 layer, the coated surface was placed under a fluorescent lamp and visually observed. The degree of solvent cracking (crack resistance) was evaluated according to the following evaluation criteria. If the crack resistance evaluation is "○" or "△", it can be judged that the crack resistance is excellent. If the crack resistance evaluation is "△", cracks were observed in some areas, but it can be said that it is at a level that does not cause practical problems. If the crack resistance evaluation is "×", cracks were observed throughout, and it can be judged that the crack resistance is poor. -Evaluation Criteria- "〇": No cracks were observed on the coated surface. "△": Partial cracks were observed on the coated surface. "×": Cracks were observed across the entire coated surface.

[0084] <Fluorescent light exposure resistance> First, the transmittance at a wavelength of 700 nm was measured for the optical components fabricated in the examples and comparative examples described later. Next, the transmittance at a wavelength of 700 nm was measured after exposure to a fluorescent lamp environment with an illuminance of 360 lux for 48 hours, and the absorbance calculated from this transmittance was determined. The ratio of the absorbance at a wavelength of 700 nm after exposure to fluorescent lamp exposure to the absorbance at a wavelength of 700 nm before exposure ((absorbance at 700 nm after exposure to fluorescent lamp) / (absorbance at 700 nm before exposure to fluorescent lamp)) was calculated, and the resistance to fluorescent lamp exposure was evaluated according to the evaluation criteria below. If the fluorescent lamp exposure resistance rating is "◎" or "〇", it can be judged to have excellent fluorescent lamp exposure resistance. If the fluorescent lamp exposure resistance rating is "△", it is slightly inferior to the "〇" case, but still at a level that does not cause practical problems. If the fluorescent lamp exposure resistance rating is "×", it can be judged to have poor fluorescent lamp exposure resistance. -Evaluation Criteria- "◎": The ratio of (absorbance at 700nm after exposure to fluorescent light) / (absorbance at 700nm before exposure to fluorescent light) was 0.99 or higher, indicating excellent resistance to exposure to fluorescent light. "〇": The ratio of (absorbance at 700 nm after exposure to fluorescent light) / (absorbance at 700 nm before exposure to fluorescent light) was 0.96 or greater and less than 0.99. "△": The ratio of (absorbance at 700 nm after exposure to fluorescent light) / (absorbance at 700 nm before exposure to fluorescent light) was 0.93 or higher and less than 0.96. "×": The ratio of (absorbance at 700 nm after exposure to fluorescent light) / (absorbance at 700 nm before exposure to fluorescent light) was less than 0.93.

[0085] [Example 1] <<Fabrication of Absorption Layer 2>> (Preparation of absorption layer 2 solution (i)) By adding 100 parts by mass of cyclic olefin resin (manufactured by JSR Corporation, product name: "Arton G7800"), 0.054 parts by mass of the following near-infrared absorber 1, 0.185 parts by mass of the following ultraviolet absorber 1 (manufactured by ADEKA Corporation, product name: Adeka Stab LA-24), 0.3 parts by mass of the following antioxidant 1, and 0.3 parts by mass of the following antioxidant 2, and further adding methylene chloride, an absorption layer 2 liquid (i) with a solid content of 20% by mass was obtained.

[0086] • Near-infrared absorber 1: A compound represented by the following structure.

[0087] [ka]

[0088] • UV absorber 1: A compound represented by the following structure.

[0089] [ka]

[0090] • Anti-aging agent 1: A compound represented by the following structure.

[0091] [ka]

[0092] • Anti-aging agent 2: A compound represented by the following structure.

[0093] [ka]

[0094] <<Fabrication of Absorption Layer 2>> The absorption layer 2 solution (i) prepared above was cast (i.e., cast molded) onto a smooth PET plate to form a layer. Then, after drying at 20°C for 8 hours, it was peeled off the PET plate. The peeled coating was further dried under reduced pressure at 100°C for 8 hours to obtain an absorption layer 2 with a thickness of 200 μm and a size of 20 cm × 30 cm.

[0095] <<Fabrication of Intermediate Layer 1>> (Preparation of intermediate layer 1 solution (i)) In a container, weigh out 1:80 parts by mass of the monomer listed below, 20 parts by mass of urethane acrylate (manufactured by Taisei Fine Chemical Co., Ltd., product name: 8UX-082A), 3 parts by mass of the photopolymerization initiator 1 (manufactured by BASF, product name: Irgacure 184), and 0.2 parts by mass of coating film surface modifier 1 (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KP-624). Dilute the mixture with a solvent in a mixing ratio (volume %) of MEK (methyl ethyl ketone): IPA (isopropyl alcohol): PGME (propylene glycol monomethyl ether) of 20:45:35 to prepare intermediate layer 1 solution (i) (curable resin composition) with a solid content concentration of 22% by mass.

[0096] • Photopolymerization initiator 1: A compound represented by the following structure.

[0097] [ka]

[0098] • Monomer 1: A compound represented by the following structure.

[0099] [ka]

[0100] <<Fabrication of Intermediate Layer 1>> The absorption layer 2 prepared as described above was prepared, and then the curable resin composition prepared as described above was applied to the surface of the absorption layer 2 by bar coating so that the thickness of the resulting resin layer was 2 μm. The curable resin composition was cured by irradiation with ultraviolet light under a nitrogen atmosphere to form an intermediate layer 1 on the absorption layer 2, thereby obtaining a laminate (absorption layer 2 / intermediate layer 1).

[0101] (Synthesis of polymer 1-1) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 40% by mass of methyl methacrylate (MMA) and 60% by mass of N-cyclohexylmaleimide (CHMI) were added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-1 (polymer 1). The molecular weight of the obtained polymer 1-1 was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), with the weight-average molecular weight (Mw) being 400,000 and the number-average molecular weight (Mn) being 160,000. The glass transition temperature was also measured. The results are shown in Table 3.

[0102] (Preparation of absorbent layer 1 solution) 100 parts by mass of the polymer 1-1 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, and 0.3 parts by mass of antioxidant 2 were each weighed out, and a solvent with a mixing ratio (volume %) of DIOX (1,3-dioxolane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) = 65 / 20 / 15 was added and diluted to prepare an absorption layer 1 solution with a solid content concentration of 16% by mass.

[0103] Near-infrared absorber 2: A compound represented by the following structure.

[0104]

Chemical formula

[0105] Near-infrared absorber 3: A compound represented by the following structure.

[0106]

Chemical formula

[0107] Near-infrared absorber 4: A compound represented by the following structure.

[0108]

Chemical formula

[0109] <<Fabrication of Absorption Layer 1>> The laminate (absorption layer 2 / intermediate layer 1) prepared above was prepared, and the absorption layer 1 solution was coated on the surface of the intermediate layer 1 in the laminate by the bar coating method so that the thickness of the resulting absorption layer 1 would be 5 μm. The coating film was heated at 70 °C for 3 minutes and then at 120 °C for 5 minutes to form the absorption layer 1, thereby obtaining a laminate (absorption layer 2 / intermediate layer 1 / absorption layer 1).

[0110] <<Fabrication of OC (Overcoat) Layer 1>> (Preparation of OC1 Solution) Weigh out 37.5 parts by mass of Monomer 2, 62.5 parts by mass of Monomer 3, 3 parts by mass of the above Photoinitiator 1, and 0.08 parts by mass of Film Surface Modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) into a container, add a solvent with a mixing ratio (volume %) of IPA:MEK = 10:90 and dilute to prepare an OC1 solution (curable resin composition) with a solid content concentration of 22% by mass. Next, prepare a laminate (Absorbent Layer 2 / Intermediate Layer 1 / Absorbent Layer 1), and coat the surface of Absorbent Layer 1 with the OC1 solution prepared above by the bar coating method so that the thickness of the resulting resin layer becomes 2.2 μm. Cure by irradiating with ultraviolet light under a nitrogen atmosphere to form an OC Layer 1, thereby obtaining a laminate (Absorbent Layer 2 / Intermediate Layer 1 / Absorbent Layer 1 / OC Layer 1).

[0111] · Monomer 2: A compound represented by the following structure.

[0112]

Chemical formula

[0113] · Monomer 3: A compound represented by the following structure.

[0114]

Chemical formula

[0115] <<Preparation of OC Layer 2>> (Preparation of OC2 Solution) Weigh out 30 parts by mass of Monomer 2, 50 parts by mass of Monomer 3, 20 parts by mass of Monomer 1, 3 parts by mass of Photoinitiator 1, and 0.08 parts by mass of Film Surface Modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) into a container, add a solvent with a mixing ratio (volume %) of IPA:PGME:MEK = 45:35:20 and dilute to prepare a curable resin composition with a solid content concentration of 22% by mass. Next, a laminate (absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1) was prepared, and the above curable resin composition was applied to the surface of absorption layer 2 by bar coating so that the thickness of the resulting resin layer was 2 μm. The resin was cured by ultraviolet irradiation under a nitrogen atmosphere to form the OC2 layer. In this way, an optical component was fabricated in which each layer was formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1.

[0116] <Fabrication of optical filters> A dielectric multilayer film according to Design 1 below was deposited on the OC layer 1 of the obtained optical component, and a dielectric multilayer film according to Design 2 below was deposited on the OC layer 2 of the obtained optical component, using an ion-assisted deposition apparatus (Showa Vacuum Co., Ltd., Model: Sapio1300i), thereby obtaining an optical filter with a dielectric multilayer film. Each of the above evaluations was performed on the obtained optical filters. The results are shown in Table 3.

[0117] [Table 1]

[0118] [Table 2]

[0119] [Example 2] (Synthesis of polymers 1-2 in absorption layer 1) Polymer 1-2 was synthesized in the same manner as polymer 1-1 in absorption layer 1 of Example 1, except that the polymerization conditions were changed so that the weight-average molecular weight (Mw) of the resulting polymer was 850,000. The glass transition temperature (Tg) was measured in the same manner as polymer 1-1 of Example 1. The results are shown in Table 3.

[0120] <Fabrication of optical filters> Except for preparing the absorption layer 1 solution using polymer 1-2 instead of polymer 1-1 in Example 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. Using the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0121] [Example 3] <<Synthesis of Polymers 1-3>> A flask equipped with a condenser and a stirrer was pre-charged with 0.02 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 40% by mass of methyl methacrylate (MMA) and 60% by mass of N-cyclohexylmaleimide (CHMI) were added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to terminate the polymerization. Then, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-3 with a weight-average molecular weight (Mw) of 236,000 and a number-average molecular weight (Mn) of 100,000. The glass transition temperature (Tg) of polymer 1-3 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 3.

[0122] <Fabrication of optical filters> In Example 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, except that polymer 1-3 was used instead of polymer 1-1 to prepare the absorption layer 1 solution. An optical component was then fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. Using the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0123] [Example 4] (Preparation of Absorbent Layer 1 Solution) Weighed out 100 parts by mass of the polymer synthesized above, 0.42 parts by mass of the following near-infrared absorber 5, 2.18 parts by mass of the following near-infrared absorber 6, 0.60 parts by mass of the near-infrared absorber 3, 4.06 parts by mass of the near-infrared absorber 4, 0.3 parts by mass of the antioxidant 1, and 0.3 parts by mass of the antioxidant 2. These were diluted with a solvent in a mixture ratio (volume %) of DIOX (1,4-dioxane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) of 65 / 20 / 15 to prepare an absorption layer 1 solution with a solid content of 16% by mass.

[0124] • Near-infrared absorber 5: A compound represented by the following structure.

[0125] [ka]

[0126] • Near-infrared absorber 6: A compound represented by the following structure.

[0127] [ka]

[0128] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0129] [Example 5] (Preparation of Absorbent Layer 1 Solution) As polymer 1-4, 100 parts by mass (maleimide copolymer (polymer of N-phenylmaleimide, methyl methacrylate, and styrene), manufactured by Nippon Shokubai Co., Ltd., product name: Polyimilex® PML203):, near-infrared absorber 2: 2.5 parts by mass, near-infrared absorber 3: 1.5 parts by mass, near-infrared absorber 4: 3.75 parts by mass, antioxidant 1: 0.3 parts by mass, and antioxidant 2: 0.3 parts by mass were weighed out and diluted with a solvent in a mixture ratio (vol.%) of DIOX (1,3-dioxolane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) = 65 / 20 / 15 to prepare absorption layer 1 solution with a solid content concentration of 16% by mass. The weight-average molecular weight (Mw) and glass transition temperature (Tg) of polymer 1-4 are shown in Table 3.

[0130] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0131] [Example 6] (Preparation of Absorbent Layer 1 Solution) The polymer synthesized above was weighed out in 100 parts by mass in a ratio of 1-1:2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, and 0.3 parts by mass of antioxidant 2. These were then diluted with a solvent in a mixing ratio of CPN (cyclopentanone) / PGMEA = 85 / 15 (volume %) to prepare an absorption layer 1 solution with a solid content concentration of 16% by mass.

[0132] <Fabrication of optical filters> Except for forming the absorption layer 1 using the absorption layer 1 solution prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0133] [Example 7] (Synthesis of polymers 1-5) A flask equipped with a condenser and a stirrer was pre-charged with 0.005 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 35% by mass of methyl methacrylate (MMA), 5% by mass of n-butyl acrylate (BA), and 60% by mass of N-cyclohexylmaleimide (CHMI) were added. After purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to complete the polymerization. The reaction product solution was then added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-5 with a weight-average molecular weight (Mw) of 730,000 and a number-average molecular weight (Mn) of 250,000. The glass transition temperature (Tg) of polymer 1-5 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 3.

[0134] (Preparation of Absorbent Layer 1 Solution) The polymer 1-5 synthesized above was weighed out in 100 parts by mass, near-infrared absorber 2 in 2.5 parts by mass, near-infrared absorber 3 in 1.5 parts by mass, near-infrared absorber 4 in 3.75 parts by mass, antioxidant 1 in 0.3 parts by mass, and antioxidant 2 in 0.3 parts by mass. These were then diluted with a solvent containing DIOX (1,3-dioxolane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) in a mixture ratio of 65 / 20 / 15 (volume %) to prepare an absorption layer 1 solution with a solid content concentration of 12% by mass.

[0135] <Fabrication of optical filters> Except for forming the absorption layer 1 using the absorption layer 1 solution prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0136] [Example 8] (Synthesis of polymers 1-6) A flask equipped with a condenser and a stirrer was pre-charged with 0.005 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 30% by mass of methyl methacrylate (MMA), 10% by mass of n-butyl acrylate (BA), and 60% by mass of N-cyclohexylmaleimide (CHMI) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymers 1-6. The weight-average molecular weight (Mw) and number-average weight-average molecular weight (Mn) of polymer 1-6 were measured under the same measurement conditions as polymer 1-1 in Example 1. The weight-average molecular weight (Mw) was 730,000 and the number-average molecular weight (Mn) was 250,000. The glass transition temperature (Tg) of polymer 1-6 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 3.

[0137] (Preparation of Absorbent Layer 1 Solution) The polymers 1-6 synthesized above were weighed out in 100 parts by mass, near-infrared absorber 2 in 2.5 parts by mass, near-infrared absorber 3 in 1.5 parts by mass, near-infrared absorber 4 in 3.75 parts by mass, antioxidant 1 in 0.3 parts by mass, and antioxidant 2 in 0.3 parts by mass. These were then diluted with a solvent containing DIOX (1,3-dioxolane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) in a mixture ratio of 65 / 20 / 15 (volume %) to prepare an absorption layer 1 solution with a solid content concentration of 12% by mass.

[0138] <Fabrication of optical filters> Except for forming the absorption layer 1 using the absorption layer 1 solution prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0139] [Example 9] In Example 1, after fabricating the absorption layer 2, the absorption layer 1 solution was applied to the surface of the absorption layer 2 in the laminate by the bar coating method so that the thickness of the resulting absorption layer 1 was 5 μm. Except for this, the OC layer 1 and OC layer 2 were formed in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0140] [Example 10] <<Fabrication of Intermediate Layer 1>> (Preparation of Intermediate Layer 1 (H)) 1:20 parts by mass of monomer, 2:30 parts by mass of monomer, 3:50 parts by mass of monomer, 1:3 parts by mass of photopolymerization initiator, and 0.19 parts by mass of coating film surface modifier 1 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-624) were weighed into a container, and diluted with a solvent in a mixing ratio (volume %) of IPA / PGME / MEK = 45 / 35 / 20 to prepare intermediate layer 1 solution (H) with a solid content concentration of 20% by mass.

[0141] <Fabrication of optical filters> Except for forming the intermediate layer 1 using the intermediate layer 1 solution (H) prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 3.

[0142] [Example 11] <<Fabrication of Intermediate Layer 1>> (Preparation of Intermediate Layer 1 (ii)) 1:80 parts by mass of monomer, 3:20 parts by mass of monomer, 1:3 parts by mass of photopolymerization initiator, and 0.19 parts by mass of coating film surface modifier 1 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-624) were weighed into a container, and diluted with a solvent in a mixing ratio (volume %) of IPA / PGME / MEK = 45 / 35 / 20 to prepare intermediate layer 1 solution (ii) with a solid content concentration of 20% by mass.

[0143] <Fabrication of optical filters> Except for forming the intermediate layer 1 using the intermediate layer 1 solution (ii) prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0144] [Example 12] <<Fabrication of Intermediate Layer 2>> (Preparation of intermediate layer 1 solution (v)) 1.50 parts by mass of monomer, 50 parts by mass of urethane acrylate (manufactured by Taisei Fine Chemical Co., Ltd., product name: 8UX-082A), 1.3 parts by mass of photopolymerization initiator, and 0.19 parts by mass of coating film surface modifier 1 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-624) were weighed into a container, and diluted with a solvent in a mixing ratio (volume %) of IPA / PGME / MEK = 45 / 35 / 20 to prepare intermediate layer 1 solution (v) with a solid content concentration of 20% by mass.

[0145] <Fabrication of optical filters> Except for forming the intermediate layer 1 using the intermediate layer 1 solution (v) prepared above, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0146] [Example 13] <<Absorption layer 2>> As the second absorption layer, a near-infrared absorbing glass plate (model number: "BS-13", manufactured by Matsunami Glass Industry Co., Ltd., 100mm x 100mm, thickness 200μm) was used.

[0147] <<Fabrication of Intermediate Layer 2>> (Preparation of Intermediate Layer 1 (iii)) In a container, weigh out 1:80 parts by mass of monomer, 20 parts by mass of urethane acrylate (manufactured by Taisei Fine Chemical Co., Ltd., product name: 8UX-082A), 1:3 parts by mass of photopolymerization initiator, and 2 parts by mass of silane coupling agent (3-(trimethoxysilyl)propyl acrylate). Dilute these mixtures with a solvent in a mixing ratio (volume %) of IPA / PGME / MEK = 45 / 35 / 20 to prepare intermediate layer 1 solution (iii) with a solid content concentration of 20% by mass.

[0148] <Fabrication of optical filters> Except for using the above-mentioned absorption layer 2 and intermediate layer 1 formed using the intermediate layer 1 solution (iii) prepared above, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0149] [Example 14] (Synthesis of polymers 1-7) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 60% by mass of methyl methacrylate (MMA) and 40% by mass of N-cyclohexylmaleimide (CHMI) were added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to complete the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-7. The weight-average molecular weight (Mw) and number-average weight-average molecular weight (Mn) of polymer 1-7 were measured under the same measurement conditions as polymer 1-1 in Example 1, and the weight-average molecular weight (Mw) was 400,000 and the number-average molecular weight (Mn) was 160,000. The glass transition temperature (Tg) of polymers 1-7 was measured in the same manner as for polymer 1-1 in Example 1. The results are shown in Table 4.

[0150] (Preparation of Absorbent Layer 1 Solution) The polymers 1-6 synthesized above were weighed out in 100 parts by mass, near-infrared absorber 2 in 2.5 parts by mass, near-infrared absorber 3 in 1.5 parts by mass, near-infrared absorber 4 in 3.75 parts by mass, antioxidant 1 in 0.3 parts by mass, and antioxidant 2 in 0.3 parts by mass. These were then diluted with a solvent containing DIOX (1,4-dioxane) / MEK / PGMEA (propylene glycol monomethyl ether acetate) in a mixture ratio of 65 / 20 / 15 (volume %) to prepare an absorption layer 1 solution with a solid content of 16% by mass.

[0151] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 2 was deposited on OC layer 1 of the optical component and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0152] [Example 15] (Synthesis of polymers 1-8) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 60% by mass of methyl methacrylate (MMA) and 40% by mass of N-phenylmaleimide (PhMI) were added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours to complete the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-8. The weight-average molecular weight (Mw) and number-average weight-average molecular weight (Mn) of polymer 1-8 were measured under the same measurement conditions as polymer 1-1 in Example 1, and the weight-average molecular weight (Mw) was 200,000 and the number-average molecular weight (Mn) was 100,000. The glass transition temperature (Tg) of polymers 1-8 was measured in the same manner as for polymer 1-1 in Example 1. The results are shown in Table 4.

[0153] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-6 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of MEK:DIOX(1,3-dioxolane):PGMEA = 20:65:15 to prepare a composition of one liquid absorbent layer with a solid content concentration of 16% by mass.

[0154] (Fabrication of laminates) A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0155] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical member was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical member, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical member and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical member in the same manner as in Example 1, to form a dielectric multilayer The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0156] [Example 16] (Preparation of Absorption Layer 2 Solution (ii)) By adding 100 parts by mass of cyclic olefin resin (manufactured by JSR Corporation, product name: "Arton G7800"), 0.11 parts by mass of near-infrared absorber 1, 0.37 parts by mass of ultraviolet absorber 1 (manufactured by ADEKA Corporation, product name: Adeka Stab LA-24), 0.3 parts by mass of antioxidant 1, and 0.3 parts by mass of antioxidant 2, and further adding methylene chloride, an absorption layer 2 solution (ii) with a solid content of 20% by mass was obtained.

[0157] <<Fabrication of Absorption Layer 2>> The absorption layer 2 solution (ii) prepared above was cast (i.e., cast molded) onto a smooth PET plate to form a layer. Then, after drying at 20°C for 8 hours, the layer (coating) formed from absorption layer 2 solution (ii) was peeled off the PET plate. The peeled coating was further dried under reduced pressure at 100°C for 8 hours to obtain an absorption layer 2 with a thickness of 100 μm and a size of 20 cm × 30 cm.

[0158] <Fabrication of optical filters> Except for using the absorption layer 2 solution (ii) prepared above to form and use the absorption layer 2, the absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, and an optical component was fabricated in which the layers were formed in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on the OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on the OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0159] [Example 17] (Synthesis of polymers 1-9) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 40% by mass of methyl methacrylate (MMA), 20% by mass of N-cyclohexylmaleimide (CHMI), and 40% by mass of 1-adamantyl methacrylate (AdMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymers 1-9. The molecular weight in polystyrene terms of polymers 1-9 was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran). The weight-average molecular weight (Mw) was 300,000 and the number-average molecular weight (Mn) was 120,000. The glass transition temperature (Tg) of polymer 1-9 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 4.

[0160] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-9 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of DIOX (1,3-dioxolane):MEK:PGMEA = 65:20:15 to prepare a composition of one liquid absorbent layer with a solid content concentration of 16% by mass.

[0161] <<Fabrication of Absorption Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0162] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0163] [Example 18] (Synthesis of polymers 1-10) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 35% by mass of methyl methacrylate (MMA), 20% by mass of N-cyclohexylmaleimide (CHMI), 40% by mass of 1-adamantyl methacrylate (AdMA), and 5% by mass of 2-ethylhexyl methacrylate (EHMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-10. The molecular weight in polystyrene terms of polymers 1-10 was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and one KF-602 column, developing solvent: tetrahydrofuran). The weight-average molecular weight (Mw) was 300,000 and the number-average molecular weight (Mn) was 120,000. The glass transition temperature (Tg) of polymer 1-10 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 4.

[0164] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-10 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of DIOX (1,3-dioxolane):MEK:PGMEA = 65:20:15 to prepare a composition of one liquid absorbent layer with a solid content concentration of 16% by mass.

[0165] <<Preparation of Absorbent Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0166] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0167] [Example 19] (Synthesis of polymers 1-11) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 20% ​​by mass of methyl methacrylate (MMA) and 80% by mass of 1-adamantyl methacrylate (AdMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-11. The molecular weight of polymer 1-11 obtained was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), with the weight-average molecular weight (Mw) being 300,000 and the number-average molecular weight (Mn) being 120,000. The glass transition temperature (Tg) of polymer 1-11 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 4.

[0168] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-11 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute with a solvent in a mixing ratio (volume %) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate (BuOAc) = 40:40:20 to prepare a composition of absorbing layer 1 with a solid content concentration of 16% by mass.

[0169] <<Fabrication of Absorption Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0170] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 4.

[0171] [Example 20] (Synthesis of polymers 1-12) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 60% by mass of methyl methacrylate (MMA) and 40% by mass of 1-adamantyl methacrylate (AdMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-12. The molecular weight of the obtained polymers 1-12 was measured in polystyrene equivalent using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran). The weight-average molecular weight (Mw) was 300,000 and the number-average molecular weight (Mn) was 120,000. The glass transition temperature (Tg) of polymer 1-12 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0172] (Preparation of absorbent layer 1 solution) Into a container, weigh 100 parts by mass of Polymer 1 - 12 synthesized above, 2.5 parts by mass of Near - infrared absorber 2, 1.5 parts by mass of Near - infrared absorber 3, 3.75 parts by mass of Near - infrared absorber 4, 0.3 parts by mass of Antioxidant 1, 0.3 parts by mass of Antioxidant 2, and 0.2 parts by mass of Coating film surface modifier 2 (manufactured by Shin - Etsu Chemical Co., Ltd., model number: KP - 423). Add a solvent with a mixing ratio (volume%) of MEK:MTHP(4 - methyltetrahydropyran):Butyl acetate (BuOAc)=40:40:20 and dilute to prepare a composition of Absorption layer 1 solution with a solid content concentration of 16% by mass.

[0173] [Production of Absorption layer 1] Prepare the laminate (Absorption layer 2 / Intermediate layer 1) produced above, and coat the composition of the Absorption layer 1 solution on the surface of the Intermediate layer 1 in the laminate by the bar - coating method so that the thickness of the resulting Absorption layer 1 is 5 μm. Heat the coating film at 70 °C for 3 minutes, and then at 120 °C for 5 minutes to obtain a laminate (Absorption layer 2 / Intermediate layer 1 / Absorption layer 1) with a 5 - μm - thick Absorption layer 1 formed.

[0174] [Production of Optical Filter] Except for forming and using Absorption layer 1 with the Absorption layer 1 solution prepared above, prepare Absorption layer 2, Intermediate layer 1, Absorption layer 1, OC layer 1, and OC layer 2 in the same manner as in Example 1 to produce an optical member in which each layer is formed in the order of OC layer 2 / Absorption layer 2 / Intermediate layer 1 / Absorption layer 1 / OC layer 1. For the obtained optical member, in the same manner as in Example 1, deposit a dielectric multilayer film of Design 1 on the OC layer 1 of the optical member and deposit a dielectric multilayer film of Design 2 on the OC layer 2 of the optical member to produce a dielectric - multilayer - film - coated optical filter. Perform the above evaluations on the obtained optical filter. The results are shown in Table 5.

[0175] [Example 21] [Production of Absorption layer 2] The absorbent layer 2 solution (i) prepared above was cast (i.e., cast molded) onto a smooth PET plate to form a layer. Then, after drying at 20°C for 8 hours, the absorbent layer 2 solution (i) layer (coating) was peeled off from the PET plate, and this coating was further dried under reduced pressure at 100°C for 8 hours to produce two absorbent layers 2A with a thickness of 100 μm and a size of 20 cm × 30 cm. Methyl-n-pentyl ketone was applied to one absorbent layer 2A with a bar coater to a liquid film thickness of 2.0 μm, and then the other absorbent layer 2A was laminated onto the surface coated with methyl-n-pentyl ketone using a laminator (manufactured by U-BON Co., Ltd., product name: Lamyman IKO-650E) to produce absorbent layer 2.

[0176] (Preparation of intermediate layer 1 solution (x)) In a container, weigh out 1:20 parts by mass of monomer, 3:70 parts by mass of monomer, 10 parts by weight of isocyanuric acid-modified di-triacrylate (product name: Aronics M-313, manufactured by Toagosei Co., Ltd.), 1:3 parts by mass of photopolymerization initiator, and 2 parts by mass of silane coupling agent (3-(trimethoxysilyl)propyl acrylate). Dilute these mixtures with a solvent in a mixing ratio (vol.%) of IPA / PGME / MEK = 45 / 35 / 20 to prepare intermediate layer 1 solution (x) (curable resin composition) with a solid content concentration of 20% by mass.

[0177] <<Fabrication of Intermediate Layer 1>> An absorption layer 2 was prepared, and then the curable resin composition prepared above was applied to the surface of the absorption layer 2 by bar coating so that the thickness of the resulting resin layer was 2 μm. The curable resin composition was cured by irradiation with ultraviolet light under a nitrogen atmosphere to form an intermediate layer 1 on the absorption layer 2, thereby obtaining a laminate (absorption layer 2 / intermediate layer 1).

[0178] <Fabrication of optical filters> Except for using the laminate (absorption layer 2 / intermediate layer 1) prepared above, absorption layer 1, OC layer 1, and OC layer 2 were prepared in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0179] [Example 22] (Synthesis of polymers 1-13) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 38% by mass of methyl methacrylate (MMA), 60% by mass of 1-adamantyl methacrylate (AdMA), and 2% by mass of butyl acrylate (BA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-13. The molecular weight of polymer 1 obtained was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., apparatus model: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), with the weight-average molecular weight (Mw) being 300,000 and the number-average molecular weight (Mn) being 120,000. The glass transition temperature (Tg) of polymers 1-13 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0180] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-13 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute with a solvent in a mixing ratio (volume %) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate (BuOAc) = 40:40:20 to prepare a composition of absorbing layer 1 with a solid content concentration of 16% by mass.

[0181] <<Preparation of Absorbent Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0182] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0183] [Example 23] (Synthesis of polymers 1-14) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 25% by mass of methyl methacrylate (MMA), 70% by mass of 1-adamantyl methacrylate (AdMA), and 5% by mass of 2-ethylhexyl methacrylate (EHMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-14. The molecular weight of polymer 1 obtained was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), with the weight-average molecular weight (Mw) being 300,000 and the number-average molecular weight (Mn) being 120,000. The glass transition temperature (Tg) of polymer 1-14 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0184] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-14 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate (BuOAc) = 40:40:20 to prepare a composition of absorbing layer 1 with a solid content concentration of 16% by mass.

[0185] <<Fabrication of Absorption Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0186] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0187] [Example 24] (Synthesis of polymers 1-15) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 70% by mass of 1-adamantyl methacrylate (AdMA) and 30% by mass of (2-oxo-1,3-dioxolan-4-yl)methyl methacrylate (CCMA) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-15. For the obtained polymers 1-15, the molecular weight in terms of polystyrene was measured using a gel permeation chromatography (GPC) apparatus (manufactured by Showa Denko K.K., model number: GPC-104 type, column: a combination of three LF-604 and KF-602 manufactured by Showa Denko K.K., developing solvent: tetrahydrofuran). As a result, the weight average molecular weight (Mw) was 300,000 and the number average molecular weight (Mn) was 120,000. For polymer 1-15, the glass transition temperature (Tg) was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0188] (Preparation of Absorption Layer 1 Solution) Weighed 100 parts by mass of the polymer 1-15 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) into a container, and added and diluted with a solvent having a mixing ratio (volume%) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate = 40:40:20 to prepare a composition of the absorption layer 1 solution with a solid content concentration of 16% by mass.

[0189] (Fabrication of Absorption Layer 1) Prepared the laminate (absorption layer 2 / intermediate layer 1) fabricated above, and coated the composition of the absorption layer 1 solution on the surface of the intermediate layer 1 in the laminate by the bar coating method so that the thickness of the resulting absorption layer 1 would be 5 μm. The coating film was heated at 70°C for 3 minutes and then at 120°C for 5 minutes to obtain a laminate (absorption layer 2 / intermediate layer 1 / absorption layer 1) with an absorption layer 1 having a thickness of 5 μm.

[0190] (Fabrication of Optical Filter) Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0191] [Example 25] (Synthesis of polymers 1-16) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 70% by mass of 1-adamantyl methacrylate (AdMA), 5% by mass of methyl methacrylate, and 25% by mass of dicyclopentanyl methacrylate (DCM) was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-16. The molecular weight in polystyrene terms of polymer 1-16 was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), and the weight-average molecular weight (Mw) was 300,000 and the number-average molecular weight (Mn) was 120,000. The glass transition temperature (Tg) of polymer 1-16 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0192] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-16 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate (BuOAc) = 40:40:20 to prepare a composition of absorbing layer 1 with a solid content concentration of 16% by mass.

[0193] <<Fabrication of Absorption Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0194] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0195] [Example 26] (Synthesis of polymers 1-17) A flask equipped with a condenser and a stirrer was pre-charged with 0.01 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) and 200 parts by mass of cyclopentanone. 100 parts by mass of a mixture containing 70% by mass of 1-adamantyl methacrylate (AdMA), 25% by mass of methyl methacrylate, and 5% by mass of lauryl methacrylate was added, and after purging with nitrogen, gentle stirring was started. The temperature of the solution was raised to 70°C and maintained at this temperature for 5 hours, then the temperature was raised to 90°C and maintained at this temperature for 2 hours to terminate the polymerization. Subsequently, the reaction product solution was added dropwise to a large amount of methanol to solidify the reaction product. The resulting solid was vacuum-dried at 45°C for 4 hours to obtain polymer 1-17. The molecular weight of polymer 1-17 obtained was measured using a gel permeation chromatography (GPC) apparatus (Showa Denko K.K., model number: GPC-104, column: three LF-604 columns and KF-602 column, developing solvent: tetrahydrofuran), with the weight-average molecular weight (Mw) being 300,000 and the number-average molecular weight (Mn) being 120,000. The glass transition temperature (Tg) of polymer 1-17 was measured in the same manner as polymer 1-1 in Example 1. The results are shown in Table 5.

[0196] (Preparation of absorbent layer 1 solution) In a container, weigh out 100 parts by mass of polymer 1-17 synthesized above, 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423). Dilute these mixtures with a solvent in a mixing ratio (volume %) of MEK:MTHP (4-methyltetrahydropyran):butyl acetate (BuOAc) = 40:40:20 to prepare a composition of absorbing layer 1 with a solid content concentration of 16% by mass.

[0197] <<Fabrication of Absorption Layer 1>> A laminate (absorbent layer 2 / intermediate layer 1) prepared as described above was prepared, and the composition of absorbent layer 1 was applied to the surface of intermediate layer 1 in the laminate by bar coating so that the thickness of the resulting absorbent layer 1 would be 5 μm. The coating was heated at 70°C for 3 minutes, and then at 120°C for 5 minutes to obtain a laminate (absorbent layer 2 / intermediate layer 1 / absorbent layer 1) with an absorbent layer 1 having a thickness of 5 μm.

[0198] <Fabrication of optical filters> Except for using the absorption layer 1 solution prepared above to form and use absorption layer 1, absorption layer 2, intermediate layer 1, absorption layer 1, OC layer 1, and OC layer 2 were fabricated in the same manner as in Example 1, and an optical component was fabricated in the order of OC layer 2 / absorption layer 2 / intermediate layer 1 / absorption layer 1 / OC layer 1. For the obtained optical component, a dielectric multilayer film of design 1 was deposited on OC layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to fabricate an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0199] [Comparative Example 1] (Preparation of Absorbent Layer 1 Solution) A solution of absorbent layer 1 with a solid content of 20% by mass was prepared by weighing out 100 parts by mass of cyclic olefin resin (manufactured by JSR Corporation, product name: "Arton G7800"), 0.0325 parts by mass of near-infrared absorbent 2, 0.12 parts by mass of near-infrared absorbent 4, 0.018 parts by mass of near-infrared absorbent 1, 0.185 parts by mass of ultraviolet absorbent 1 (manufactured by ADEKA Corporation, product name: Adeka Stab LA-24), 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423), diluting with methylene chloride, and so on.

[0200] <<Fabrication of Absorption Layer 1>> A PET plate was prepared, and the above absorption layer 1 liquid was cast (i.e., cast-molded) on the surface of the PET plate so that the thickness of the resulting absorption layer 1 would be 200 μm to form a layer. Then, after drying at 20 °C for 8 hours, the layer (coating film) formed from the absorption layer 1 liquid was peeled off from the PET plate. The peeled coating film was further dried at 100 °C for 8 hours under reduced pressure to produce an absorption layer 1 with a thickness of 200 μm and a size of 20 cm × 30 cm.

[0201] <<Fabrication of OC1 layer>> (Preparation of OC1 liquid (ii)) Weighed out 20 parts by mass of monomer 1, 30 parts by mass of monomer 2, 50 parts by mass of monomer 3, 3 parts by mass of photoinitiator 1, 3 parts by mass of the following photoinitiator 2, and 0.08 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) into a container respectively, and added a solvent with a mixing ratio (volume %) of IPA:PGME:MEK = 45:35:20 to dilute them, and prepared a curable resin composition with a solid content concentration of 22% by mass. Next, an absorption layer 1 was prepared, and the curable resin composition prepared above was applied onto the surface of the absorption layer 1 by the bar coating method so that the thickness of the resulting resin layer would be 2.2 μm. The curable resin composition was cured by irradiating with ultraviolet light under a nitrogen atmosphere to form an OC1 layer, and a laminate (absorption layer 1 / OC1 layer) was obtained.

[0202] <<Fabrication of OC2 layer and optical filter>> The OC2 liquid used for the fabrication of the OC2 layer was the curable resin composition prepared in Example 1. The laminate (absorption layer 1 / OC1 layer) prepared above was prepared, and the curable resin composition was applied onto the surface of the absorption layer 1 by the bar coating method. It was cured by irradiating with ultraviolet light under a nitrogen atmosphere to form an OC2 layer, and an optical member with each layer formed in the order of OC2 layer / absorption layer 1 / OC1 layer was fabricated. For the obtained optical member, in the same manner as in Example 1, a dielectric multilayer film of Design 1 was deposited on the absorption layer 1 of the optical member, and a dielectric multilayer film of Design 2 was deposited on the OC layer 2 of the optical member to fabricate a dielectric multilayer film-coated optical filter. For the obtained optical filter, the above evaluations were carried out. The results are shown in Table 5.

[0203] [Comparative Example 2] <<Fabrication of Absorption Layer 2>> The absorption layer 2 solution (ii) used to prepare absorption layer 2 was the absorption layer 2 solution (ii) prepared in Example 16. Absorbent layer 2 solution (ii) was cast (i.e., cast molded) onto a PET plate to form a layer. Then, after drying at 20°C for 8 hours, the layer (coating) formed from absorbent layer 2 solution (ii) was peeled off from the PET plate. The peeled coating was further dried under reduced pressure at 100°C for 8 hours to obtain absorbent layer 2 with a thickness of 100 μm and a size of 20 cm × 30 cm.

[0204] <<Fabrication of Intermediate Layer 1>> (Preparation of Intermediate Layer 1 (iv)) 7.5 parts by mass of epoxy resin (manufactured by ThreeBond Co., Ltd., product name: 2077B), 2.5 parts by mass of curing agent (manufactured by ThreeBond Co., Ltd., product name: 2077B, 4,4-methylenebis(2-methylcyclohexaneamine) = 25-35% by mass, modified aliphatic polyamine = 65-75% by mass), and 90 parts by mass of MEK were weighed out into a container to prepare an intermediate layer 1 solution (iv) (curable resin composition) with a solid content concentration of 22% by mass. Next, an absorption layer 2 was prepared, and the intermediate layer 1 solution (iv) prepared above was applied to the surface of the absorption layer 2 by bar coating so that the thickness of the resulting resin layer was 0.6 μm. The curable resin composition was cured by irradiation with ultraviolet light under a nitrogen atmosphere, and the intermediate layer 1 was formed on the absorption layer 2, thereby obtaining a laminate (absorption layer 2 / intermediate layer 1).

[0205] (Preparation of Absorbent Layer 1 Solution) A solution of absorbent layer 1 with a solid content of 20% by mass was prepared by weighing out 100 parts by mass of cyclic olefin resin (manufactured by JSR Corporation, product name: "Arton G7800"), 0.17 parts by mass of near-infrared absorbent 2, 0.1 parts by mass of near-infrared absorbent 3, 0.26 parts by mass of near-infrared absorbent 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423), diluting with methylene chloride, and so on.

[0206] <<Fabrication of Absorption Layer 1>> A PET plate was prepared, and the above Absorption Layer 1 liquid was cast (i.e., cast molded) on the surface of the PET plate so that the thickness of the resulting Absorption Layer 1 would be 70 μm to form a layer. Subsequently, after drying at 20°C for 8 hours, the layer (coating film) formed from the Absorption Layer 1 liquid was peeled off from the PET plate. The peeled coating film was further dried under reduced pressure at 100°C for 8 hours to fabricate an Absorption Layer 1 with a thickness of 70 μm and a size of 20 cm × 30 cm. Next, the laminate (Absorption Layer 2 / Intermediate Layer 1) fabricated above was prepared, and they were bonded together such that the Intermediate Layer 1 of the laminate faced the Absorption Layer 1 of the Absorption Layer 1 to fabricate a laminate (Absorption Layer 2 / Intermediate Layer 1 / Absorption Layer 1).

[0207] <<Fabrication of OC1 Layer>> For the OC1 liquid (ii) used in the fabrication of the OC1 layer, the OC1 liquid (ii) (curable resin composition) prepared in Comparative Example 1 was used. A laminate (Absorption Layer 2 / Intermediate Layer 1 / Absorption Layer 1) was prepared, and the above OC1 liquid (curable resin composition) was applied by the bar coating method on the surface of the Absorption Layer 1 so that the thickness of the resulting resin layer would be 2.2 μm. The curable resin composition was cured by irradiating with ultraviolet rays in a nitrogen atmosphere to form the OC1 layer, and a laminate (Absorption Layer 2 / Intermediate Layer 1 / Absorption Layer 1 / OC1 Layer) was obtained.

[0208] <<Fabrication of OC2 Layer and Optical Filter>> For the OC2 liquid used in the fabrication of the OC2 layer, the curable resin composition prepared in Example 1 was used. A laminate (Absorption Layer 2 / Intermediate Layer 1 / Absorption Layer 1 / OC1 Layer) was prepared, and the above curable resin composition was applied by the bar coating method on the surface of the Absorption Layer 2. It was cured by irradiating with ultraviolet rays in a nitrogen atmosphere to form the OC2 layer, and an optical member with each layer formed in the order of OC2 layer / Absorption Layer 2 / Intermediate Layer 1 / Absorption Layer 1 / OC1 layer 1 layer was fabricated. For the obtained optical member, in the same manner as in Example 1, a dielectric multilayer film of Design 1 was deposited on the OC layer 1 of the optical member, and a dielectric multilayer film of Design 2 was deposited on the OC layer 2 of the optical member to fabricate a dielectric multilayer film-coated optical filter. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0209] [Comparative Example 3] <<Fabrication of Absorption Layer 2>> The absorption layer 2 solution (i) used to prepare absorption layer 2 was the absorption layer 2 solution (i) prepared in Example 1. Absorbent layer 2 solution (i) was cast (i.e., cast molded) onto a PET plate to form a layer. Then, after drying at 20°C for 8 hours, the layer (coating) formed from absorbent layer 2 solution (i) was peeled off the PET plate. The peeled coating was further dried under reduced pressure at 100°C for 8 hours to obtain absorbent layer 2 with a thickness of 100 μm and a size of 20 cm × 30 cm.

[0210] <<Fabrication of Intermediate Layer 1>> The absorption layer 1 solution used to prepare absorption layer 1 was the absorption layer 1 solution prepared in Example 1. Next, the absorption layer 2 prepared as described above was prepared, and the curable resin composition prepared as described above was applied to the surface of the absorption layer 2 by bar coating so that the thickness of the resulting resin layer was 2.2 μm. The curable resin composition was cured by irradiation with ultraviolet light under a nitrogen atmosphere to form the intermediate layer 1 on the absorption layer 2, thereby obtaining a laminate (absorption layer 2 / intermediate layer 1).

[0211] <<Fabrication of Absorption Layer 1>> (Preparation of Absorbent Layer 1 Solution) 100 parts by mass of polycarbonate (manufactured by Mitsubishi Gas Chemical Company, Inc., product name: "PCZ200"), 2.5 parts by mass of near-infrared absorber 2, 1.5 parts by mass of near-infrared absorber 3, 3.75 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.2 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) were weighed out, and diluted with a solvent in a mixing ratio of CPN (cyclopentanone) / PGMEA = 85 / 15 (volume %) to prepare an absorption layer 1 solution with a solid content concentration of 16% by mass. Next, the laminate (absorbing layer 2 / intermediate layer 1) prepared above was prepared, and the curable resin composition prepared above was applied by a bar coating method onto the surface of the intermediate layer 1 so that the thickness of the resulting resin layer would be 5 μm. By curing the curable resin composition by irradiating with ultraviolet rays in a nitrogen atmosphere to form the absorbing layer 1, a laminate (absorbing layer 2 / intermediate layer 1 / absorbing layer 1) was obtained. was obtained.

[0212] [[OC1 layer fabrication]] For the OC1 solution (ii) used in the fabrication of the OC1 layer, the OC1 solution (ii) (curable resin composition) prepared in Comparative Example 1 was used. The laminate (absorbing layer 2 / intermediate layer 1 / absorbing layer 1) prepared above was prepared, and the above OC1 solution (ii) (curable resin composition) was applied by a bar coating method onto the surface of the absorbing layer 1 so that the thickness of the resulting resin layer would be 2.2 μm. By curing the curable resin composition by irradiating with ultraviolet rays in a nitrogen atmosphere to form the OC1 layer, a laminate (absorbing layer 2 / intermediate layer 1 / absorbing layer 1 / OC1 layer) was obtained.

[0213] [[OC2 layer and optical filter fabrication]] For the OC2 solution used in the fabrication of the OC2 layer, the curable resin composition prepared in Example 1 was used. The laminate (absorbing layer 2 / intermediate layer 1 / absorbing layer 1 / OC1 layer) prepared above was prepared, and the above curable resin composition was applied by a bar coating method onto the surface of the absorbing layer 2. By curing by irradiating with ultraviolet rays in a nitrogen atmosphere to form the OC2 layer, an optical member in which each layer was formed in the order of OC2 layer / absorbing layer 2 / intermediate layer 1 / absorbing layer 1 / OC1 layer was fabricated. For the obtained optical member, in the same manner as in Example 1, a dielectric multilayer film of Design 1 was deposited on the OC layer 1 of the optical member, and a dielectric multilayer film of Design 2 was deposited on the OC layer 2 of the optical member to fabricate a dielectric multilayer film-coated optical filter. For the obtained optical filter, the above evaluations were performed. The results are shown in Table 5.

[0214] [Comparative Example 4] [[Fabrication of absorbing layer 2]] For the production of the absorption layer 2, the absorption layer 2 solution (i) prepared in Example 1 was used. The absorption layer 2 solution (i) was cast (i.e., cast-molded) onto a PET plate to form a layer. Then, after drying at 20 °C for 8 hours, the layer (coating film) formed from the absorption layer 2 solution (i) was peeled off from the PET plate. The peeled coating film was further dried under reduced pressure at 100 °C for 8 hours to obtain an absorption layer 2 with a thickness of 100 μm and a size of 20 cm × 30 cm.

[0215] <<Fabrication of the absorption layer 1>> (Preparation of the absorption layer 1 solution) 20 parts by mass of monomer 1, 30 parts by mass of monomer 2, 50 parts by mass of monomer 3, 4.2 parts by mass of near-infrared absorber 2, 2.5 parts by mass of near-infrared absorber 3, 6.3 parts by mass of near-infrared absorber 4, 0.3 parts by mass of antioxidant 1, 0.3 parts by mass of antioxidant 2, and 0.08 parts by mass of coating film surface modifier 2 (manufactured by Shin-Etsu Chemical Co., Ltd., model number: KP-423) were each taken, and a solvent with a mixing ratio (volume %) of CPN / PGME (propylene glycol monomethyl ether) / IPA / MEK: 40 / 30 / 20 / 10 was added and diluted to prepare an absorption layer 1 solution with a solid content concentration of 22% by mass. Next, the absorption layer 2 prepared above was prepared, and the curable resin composition prepared above was applied onto the surface of the absorption layer 2 by the bar coating method so that the thickness of the resulting resin layer would be 3 μm. The curable resin composition was cured by irradiating with ultraviolet light in a nitrogen atmosphere to form the absorption layer 1, thereby obtaining a laminate (absorption layer 2 / absorption layer 1).

[0216] <<Fabrication of the OC2 layer and the optical filter>> For the production of the OC2 layer, the curable resin composition prepared in Example 1 was used as the OC2 liquid. A laminate (absorption layer 2 / absorption layer 1) prepared as described above was prepared, and the curable resin composition was applied from the laminate onto the surface of absorption layer 2 by bar coating. By curing with ultraviolet irradiation under a nitrogen atmosphere, an OC2 layer was formed, thereby creating an optical component in which each layer was formed in the order of OC2 layer / absorption layer 2 / absorption layer 1. Using the obtained optical component, a dielectric multilayer film of design 1 was deposited on absorption layer 1 of the optical component, and a dielectric multilayer film of design 2 was deposited on OC layer 2 of the optical component, in the same manner as in Example 1, to create an optical filter with a dielectric multilayer film. The obtained optical filters were evaluated according to the above criteria. The results are shown in Table 5.

[0217] [Table 3]

[0218] [Table 4]

[0219] [Table 5]

[0220] Optical filters equipped with an absorption layer 1 formed from the compositions of Examples 1 to 26 exhibit superior fluorescence emission suppression compared to optical filters equipped with an absorption layer 1 formed from the compositions of Comparative Examples 1 to 4. Layers formed from the compositions of Examples 1 to 26 exhibit superior crack resistance and coating appearance compared to layers formed from the compositions of Comparative Examples 1 to 4.

Claims

1. A polymer 1 comprising (i) at least one structural unit selected from structural units derived from N-substituted maleimide compounds and structural units derived from compounds having bridged alicyclic hydrocarbon groups, and (ii) structural units derived from compounds having (meth)acryloyl groups (however, the structural units related to (ii) above do not include structural units corresponding to (i) above), and having a weight-average molecular weight (Mw) on a polystyrene basis of 50,000 to 1,500,000 as measured by gel permeation chromatography (GPC), Near-infrared absorber, Solvents and, A composition containing the following:

2. The composition according to claim 1, wherein the substituent in the N-substituted maleimide compound is an alicyclic hydrocarbon group.

3. The composition according to claim 1, wherein the compound having a bridged alicyclic hydrocarbon group is a compound having 11 or fewer carbon atoms.

4. The composition according to claim 1, wherein the glass transition temperature (Tg) of the polymer 1 is 130 to 200°C.

5. The composition according to claim 1, wherein the solvent comprises at least one compound selected from the group consisting of ketone compounds having 6 or fewer carbon atoms, ether compounds having 6 or fewer carbon atoms, and alkylene glycol monomethyl ether acetate compounds.

6. The composition according to claim 1, wherein the near-infrared absorber is at least one compound selected from the group consisting of squarylium compounds, phthalocyanine compounds, naphthalocyanine compounds, crokonium compounds, and polymethine compounds (however, squarylium compounds, crokonium compounds, and cyanine compounds are not included).

7. An optical member comprising an absorption layer 1 formed from the composition described in any one of claims 1 to 6.

8. The aforementioned absorption layer 1, A support disposed on the surface of the absorption layer 1, The optical member according to claim 7, comprising:

9. The optical member according to claim 8, wherein the support comprises a near-infrared absorbing agent and is an absorbing layer 2 other than the absorbing layer 1.

10. The optical member according to claim 8, further comprising an intermediate layer between the absorption layer 1 and the support.

11. The optical member according to claim 7, A dielectric multilayer film disposed on at least one surface of the optical member, An optical filter equipped with [specific features / features].

12. A solid-state imaging device comprising the optical filter described in claim 11.

13. A camera module comprising the optical filter described in claim 11.

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