Lens, optical member, and imaging camera

Abstract

To provide a lens with which an imaging camera can be obtained, which has improved reliability in a high humidity condition and prevents generation of color noise.SOLUTION: A lens includes a compact of a resin composition including resin (A) and a coloring agent (B). The values of L*, a*, and b* in the L*a*b* colorimetric system obtained by measuring a flat plate with a thickness of 1 mm formed of the resin composition in conformity to JIS Z 8781-4:2013, are within the following ranges. L*: 80 or more and 95 or less. a*: -5 or more and 5 or less. b*: -20 or more and -5 or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a lens, an optical member, and an imaging camera. [Background technology]

[0002] In imaging cameras, a phenomenon called color noise is known in which colors different from the actual colors are generated. Color noise can occur due to various factors such as diffraction and aberration that occur in the optical system, or noise during digital processing, but since it reduces the contrast of the image, it is desirable to avoid it as much as possible.

[0003] Patent Document 1 discloses an imaging device having an optical lens and an imaging element having a light receiving surface that forms an image of a subject through the optical lens, generating and recording image data from an image signal output from the imaging element, the imaging device having a contrast data calculation means that calculates contrast data based on the image data, a color data calculation means that calculates color data based on the image data, a first lens position determination means that determines a first lens position of the optical lens that focuses the image of the subject on the light receiving surface based on the contrast data, a second lens position determination means that determines a second lens position of the optical lens where the color data reaches a peak, and a determination means that calculates a difference between the first lens position and the second lens position and compares the difference with a predetermined threshold value, and the determination means determines that color moiré will occur when the difference is smaller than the threshold value.

[0004] Furthermore, Patent Document 2 discloses an image processing device comprising: an estimation means for estimating a moiré component contained in an image based on optical characteristic information; a determination means for determining a correction amount based on the estimated moiré component; and a correction means for correcting the image based on the correction amount so as to reduce the moiré component contained in the image. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-053883 A [Patent Document 2] JP 2017-028594 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a lens that makes it possible to obtain an imaging camera with improved reliability under high humidity conditions and with reduced color noise. [Means for solving the problem]

[0007] That is, according to the present invention, there are provided a lens, an optical member, and an imaging camera as described below. 1. Resin (A); A dye (B); A lens comprising a molded article of a resin composition comprising: The L of a 1 mm-thick flat plate made of the resin composition was measured in accordance with JIS Z 8781-4:2013. * a * b * L in color space * , a * and b * Lenses whose values ​​are within the following ranges. L * :80 or more and 95 or less a * :-5 or more and 5 or less b * :-20 or more -5 or less 2. The lens according to claim 1, wherein the resin (A) comprises a thermoplastic resin. 3. The lens according to 1. or 2., wherein the resin (A) contains at least one selected from the group consisting of a copolymer of an α-olefin and a cyclic olefin, and a ring-opening polymer of a cyclic olefin. 4. The lens according to any one of 1. to 3., wherein the resin (A) has a structural unit (a) derived from a cyclic olefin represented by the following general formula [I]: [ka] (In the above general formula [I], n is 0 or 1, m is 0 or a positive integer, and q is 0 or 1. When q is 1, R a and R b are each independently the following atoms or hydrocarbon groups, and when q is 0, the respective bonds are bonded to form a 5-membered ring. 1 ~R 18 And R a and R b are each independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom. Here, the halogen atom is a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom. 5. The resin (A) is a copolymer of ethylene and tetracyclo[4.4.0.1 2,5 .1 7,10 5. The lens according to any one of 1. to 4., comprising a copolymer with 1-3-dodecene). 6. The lens according to any one of 1. to 5., wherein the dye (B) contains a compound represented by the following general formula (1): [ka] (In the above general formula (1), R 1 and R 2 , R 3 and R 4 , R 5 and R 6 And R 7 and R 8 Each of R represents a hydrogen atom or a linear, branched or cyclic alkyl group. 1 and R 2 , R 3 and R 4 , R 5 and R 6 And R 7 and R 8Each of the elements cannot be the same. M represents Cu or VO.) 7. In the general formula (1), R 1 , R 3 , R 5 and R 7 is a tert-butyl group, and R 2 , R 4 , R 6 and R 8 7. The lens according to 6., wherein is a hydrogen atom and M is Cu. 8. The lens according to any one of 1. to 7., wherein the content of the dye (B) relative to 100 parts by mass of the resin (A) is 0.0003 parts by mass or more and 0.03 parts by mass or less. 9. An optical member comprising a lens according to any one of 1. to 8. 10. An imaging camera equipped with the optical element described in 9. Effect of the Invention

[0008] According to the present invention, it is possible to provide a lens that can provide an imaging camera with improved reliability under high humidity conditions and with reduced color noise. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present invention will be described based on an embodiment. In this disclosure, the descriptions "XX to YY" and "XX to YY" representing a numerical range mean a numerical range including the lower and upper limits, which are the endpoints, unless otherwise specified. When a numerical range is described in stages, the upper and lower limits of each numerical range can be arbitrarily combined. Each monomer constituting the cyclic olefin copolymer of the present invention may be a monomer obtained from a fossil raw material, or a monomer obtained from an animal or plant raw material.

[0010] [lens] The lens of this embodiment will be described in detail below.

[0011] The lens of this embodiment is Resin (A); A dye (B); A lens comprising a molded article of a resin composition comprising: The L of a 1 mm-thick flat plate made of the resin composition was measured in accordance with JIS Z 8781-4:2013. * a * b * L in color space * , a * and b * The values ​​are within the following ranges. L * :80 or more and 95 or less a * :-5 or more and 5 or less b * :-20 or more -5 or less

[0012] The mechanism by which the lens of this embodiment solves the above problems is not clear, but it is speculated that the above problems are solved by the following mechanism. First, the resin composition L which is the raw material of the lens of this embodiment * , a * and b * It is speculated that adjusting the value of to a certain range will suppress excessive incidence of yellow light into the RGB color sensor. In general, yellow light is highly sensitive to both the R sensor and G sensor of the RGB color sensor, and is therefore likely to cause color noise. Therefore, it is speculated that color noise will be corrected by suppressing the excessive incidence of yellow light.

[0013] Here, in the methods described in Patent Documents 1 and 2, etc., it may be necessary to add a driving system or the like to correct color noise, which may result in an increase in the size of the imaging device, or an increase in the power consumption of the device due to complex image processing. On the other hand, the lens of this embodiment makes it possible to obtain an imaging camera in which the generation of color noise is suppressed. Therefore, the lens of this embodiment makes it possible to take measures against color noise without using an additional driving system or the like or image processing technology.

[0014] Hereinafter, each component contained in the resin composition for the lens of the present embodiment will be described in detail.

[0015] <Resin (A)> The resin composition for the lens of the present embodiment contains a resin (A). Resin (A) is not particularly limited, and may be a thermosetting resin or a thermoplastic resin.Specific examples include epoxy resin, polyester resin, polyolefin resin (including copolymer of α-olefin and cyclic olefin), polycarbonate resin, polyvinyl chloride resin, styrene resin, acrylic resin, polyamide resin, cellulose resin, urethane resin, and silicone resin.Resin (A) may be used alone or in combination of two or more.

[0016] Among these, from the viewpoints of dimensional stability, moldability, and optical properties of the lens, it is preferable for the resin (A) to contain a thermoplastic resin, and it is more preferable for it to contain at least one type selected from a copolymer of an α-olefin and a cyclic olefin, and a ring-opening polymer of a cyclic olefin (hereinafter, these are also collectively referred to as a "cyclic olefin polymer").

[0017] The cyclic olefin polymer will be described in detail below.

[0018] From the viewpoints of dimensional stability, moldability, and optical properties of the lens, and of reducing the water absorption rate described below, it is preferable that the resin (A) contains a cyclic olefin polymer having a structural unit (a) derived from a cyclic olefin represented by the following general formula [I]. A specific example of such a cyclic olefin polymer is the polymer (A) described in JP-A-2009-120794.

[0019] [ka]

[0020] In the above general formula [I], n is 0 or 1, m is 0 or a positive integer, and q is 0 or 1. When q is 1, R a and R b are each independently the following atoms or hydrocarbon groups, and when q is 0, the respective bonds are bonded to form a 5-membered ring. 1 ~R 18 And R a and R b are each independently a hydrogen atom, a halogen atom or a hydrocarbon group which may be substituted with a halogen atom, wherein the halogen atom is a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0021] Examples of the hydrocarbon group include, independently, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, and an aromatic hydrocarbon group. More specifically, examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, an amyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group, and an octadecyl group, examples of the cycloalkyl group include a cyclohexyl group, and examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, and the like. These hydrocarbon groups may be substituted with a halogen atom.

[0022] Furthermore, in the above general formula [I], R 15 ~R 18 may be bonded to each other (together with each other) to form a monocyclic or polycyclic ring, and the monocyclic or polycyclic ring thus formed may have a double bond. Specific examples of the monocyclic or polycyclic ring formed here are shown below.

[0023] [ka]

[0024] In the above examples, the carbon atoms numbered 1 and 2 are R 15 (R 16 ) or R 17 (R18 ) indicates the carbon atom to which the atom is bonded. 15 and R 16 With or R 17 and R 18 and the like may form an alkylidene group. Such an alkylidene group is usually an alkylidene group having 2 to 20 carbon atoms, and specific examples of such an alkylidene group include an ethylidene group, a propylidene group, and an isopropylidene group.

[0025] More specific examples of the cyclic olefin represented by the above general formula [I] are given below.

[0026] [ka]

[0027] Examples of the bicyclo[2.2.1]-2-heptene represented by the above formula (wherein the numbers 1 to 7 indicate the carbon position numbers) and derivatives of bicyclo[2.2.1]-2-heptene substituted with, for example, a halogen atom or a hydrocarbon group which may be substituted with a halogen atom are included. Examples of the halogen atom include the same as the halogen atom in the above general formula [I]. Examples of the hydrocarbon group include, for example, 5-methyl, 5,6-dimethyl, 1-methyl, 5-ethyl, 5-n-butyl, 5-isobutyl, 7-methyl, 5-phenyl, 5-methyl-5-phenyl, 5-benzyl, 5-tolyl, 5-(ethylphenyl), 5-(isopropylphenyl), 5-(biphenyl), 5-(beta-naphthyl), 5-(alpha-naphthyl), 5-(anthracenyl), 5,6-diphenyl, and the like. These hydrocarbon groups may be substituted with a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.

[0028] Further derivatives include cyclopentadiene-benzyne adducts, cyclopentadiene-acenaphthylene adducts, 1,4-methano-1,4,4a,9a-tetrahydrofluorene, and 1,4-methano-1,4,4a,5,10,10a-hexahydroanthracenadonobicyclo[2.2.1]-2-heptene derivatives.

[0029] Further derivatives include tricyclo[4.3.0.1 2,5 ]-3-decene, 2-methyltricyclo[4.3.0.1 2,5 ]-3-decene, 5-methyltricyclo[4.3.0.1 2,5 ]-3-decene and other tricyclo[4.3.0.1 2,5 ]-3-decene derivatives, tricyclo[4.4.0.1 2,5 ]-3-Undecene, 10-Methyltricyclo[4.4.0.1 2,5 ]-3-undecene and other tricyclo[4.4.0.1 2,5 ]-3-undecene derivatives and the like.

[0030] [ka]

[0031] The tetracyclo[4.4.0.1 2,5 .1 7,10]-3-dodecene (wherein the numbers 1 to 12 indicate the carbon position numbers) and derivatives thereof substituted with a hydrocarbon group. Examples of the hydrocarbon group include 8-methyl, 8-ethyl, 8-propyl, 8-butyl, 8- Isobutyl, 8-hexyl, 8-cyclohexyl, 8-stearyl, 5,10-dimethyl, 2,10-dimethyl, 8,9-dimethyl, 8-ethyl-9-methyl, 11,12-dimethyl, 2,7,9-trimethyl, 2,7-dimethyl-9-ethyl, 9-isobutyl-2,7-dimethyl, 9,11,12-trimethyl, 9-ethyl-11,12-dimethyl, 9-isobutyl-11,12-dimethyl, 5,8,9,10-tetramethyl, 8-ethylidene, 8-ethylidene-9-methyl, 8-ethylidene-9-ethyl, 8-ethylidene-9-isopropyl, 8-ethylidene-9-butyl, 8-n-propylidene, 8-n-propylidene-9-methyl, 8-n-propyl 8-n-propylidene-9-isopropyl, 8-n-propylidene-9-butyl, 8-isopropylidene, 8-isopropylidene-9-methyl, 8-isopropylidene-9-ethyl, 8-isopropylidene-9-isopropyl, 8-isopropylidene-9-butyl, 8-chloro, 8-bromo, 8-fluoro, 8,9-dichloro, 8-phenyl, 8-methyl-8-phenyl, 8-benzyl, 8-tolyl, 8-(ethylphenyl), 8-(isopropylphenyl), 8,9-diphenyl, 8-(biphenyl), 8-(beta-naphthyl), 8-(alpha-naphthyl), 8-(anthracenyl), 5,6-diphenyl, and the like.

[0032] Specific examples of the cyclic olefin represented by the general formula [I] are given above, but more specific structural examples of these compounds include structural examples of cyclic olefins shown in paragraphs

[0038] to

[0058] of the original specification of JP-A-6-228380 and structural examples of cyclic olefins shown in paragraphs

[0027] to

[0029] of the original specification of JP-A-2005-330465. The cyclic olefin polymer according to this embodiment may contain two or more types of units derived from the above cyclic olefins.

[0033] The cyclic olefin represented by the above general formula [I] can be produced by the Diels-Alder reaction of cyclopentadiene with olefins having the corresponding structure. The cyclic monomer obtained by such a Diels-Alder reaction is usually obtained as an isomer mixture of endo and exo isomers, with the endo isomer being the predominant isomer. However, the concentration of the exo isomer in the isomer mixture can be increased by a method known in the art, for example, a method described in JP-A-5-86131. ​​In accordance with this, the ratio of endo isomer / exo isomer of the cyclic monomer can be adjusted within a range that does not impair the object of the present invention.

[0034] Among the above, the cyclic olefin polymer according to the present embodiment is preferably a norbornene polymer obtained by polymerizing a norbornene monomer containing a structural unit derived from a monomer having a norbornene skeleton. Specific examples of the norbornene monomer are described below.

[0035] (Ethylene or α-olefin and cyclic olefin copolymer) As described above, the cyclic olefin polymer according to the present embodiment includes at least one selected from the copolymer of ethylene or an α-olefin and a cyclic olefin, and the ring-opening polymer of a cyclic olefin, and preferably includes the copolymer of ethylene or an α-olefin and a cyclic olefin. As the copolymer of ethylene or α-olefin and cyclic olefin, for example, the polymers described in paragraphs 0030 to 0123 of WO 2008 / 047468 and the cyclic olefin polymers described in JP 2016-8236 A can be used.

[0036] The copolymer of ethylene or an α-olefin and a cyclic olefin is, for example, a polymer having an alicyclic structure in at least a portion of the repeating structural units (hereinafter, also simply referred to as a "polymer having an alicyclic structure"), as long as at least a portion of the repeating units of the polymer has an alicyclic structure, and specifically, it is preferable to include a polymer having one or more structures represented by the following general formula (1).

[0037] [ka] In formula (1), x and y represent a copolymerization ratio and are real numbers that satisfy the relationship 0 / 100≦y / x≦95 / 5. x and y are on a molar basis. n represents the number of substituents Q and is a real number satisfying 0≦n≦2. R 1 R is one or more 2+n-valent groups selected from the group consisting of hydrocarbon groups having 2 to 20 carbon atoms, preferably 2 to 12 carbon atoms. 2 R is one or more monovalent groups selected from the group consisting of a hydrogen atom and a hydrocarbon group having 1 to 10 carbon atoms. 3 represents one or more tetravalent groups selected from the group consisting of hydrocarbon groups having 2 to 10 carbon atoms, preferably 2 to 5 carbon atoms. Q is for COOR d (R d is a hydrogen atom or a monovalent group selected from the group consisting of hydrocarbon groups having 1 to 10 carbon atoms. R 1 , R 2 , R 3 and Q may each be one type, or two or more types in any ratio.

[0038] For each symbol in the above formula (1), the following preferable conditions can be mentioned, and these conditions can be used in combination as necessary. [1] R 1 is a group having at least one ring structure in its structure. [2] R 3 When n=0, the following exemplary structures are (a), (b), and (c).

[0039] [ka] In the above formulas (a) to (c), R 1 is the same as equation (1).

[0040] [3] n is 0. [4] y / x is a real number satisfying 20 / 80≦y / x≦65 / 35. [5] R 2 is a hydrogen atom and / or -CH3. [6] Q is a -COOH or -COOCH group.

[0041] The cyclic olefin polymer used in the present embodiment is more preferably a polymer having one or more structures represented by the following formula (2). [ka]

[0042] In the above formula (2), R 1 represents one or more divalent groups selected from the group consisting of hydrocarbon groups having 2 to 20 carbon atoms, preferably 2 to 12 carbon atoms. R 2 represents one or more monovalent groups selected from the group consisting of a hydrogen atom and hydrocarbon groups having 1 to 10 carbon atoms.

[0043] In the above formula (2), x and y represent a copolymerization ratio and are real numbers that satisfy 5 / 95≦y / x≦95 / 5, preferably 50 / 50≦y / x≦95 / 5, and more preferably 55 / 45≦y / x≦80 / 20. x and y are on a molar basis.

[0044] For each symbol in the above formula (2), the following preferable conditions can be mentioned, and these conditions can be used in combination as necessary. [1] R 1 The group is a divalent group represented by the following formula (3).

[0045] [ka]

[0046] In the above formula (3), p is an integer of 0 to 2. Preferably, p is 1 in the above formula (3), which is a divalent group.

[0047] [2]R 2 is a hydrogen atom.

[0048] Examples of the ethylene or α-olefin include ethylene, propylene, butene-1, etc., with ethylene being preferred. Examples of the cyclic olefin include the cyclic olefin represented by the above general formula [I], such as bicyclo[2.2.1]-2-heptene, tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene, 1,4-methano-1,4,4a,9a-tetrahydrofluorene, cyclopentadiene-benzyne adduct and cyclopentadiene-acenaphthylene adduct are preferred, and bicyclo[2.2.1]-2-heptene and tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene is more preferable.

[0049] From the viewpoints of dimensional stability, moldability, and optical properties of the lens, as well as low water absorption rate described later, the resin (A) is a copolymer of ethylene and tetracyclo[4.4.0.1 2,5 .1 7,10 It is preferred that the copolymer contains 1-(2-methyl-1,2-dioxane)-3-dodecene.

[0050] The copolymer of ethylene or α-olefin and cyclic olefin according to the present embodiment may have a repeating structural unit derived from another copolymerizable monomer, as long as the excellent physical properties of the resin composition according to the present embodiment and the molded article obtained from the resin composition are not impaired. The copolymerization ratio is not particularly limited, but the repeating structural unit derived from a monomer other than ethylene or α-olefin and cyclic olefin is preferably 20 mol% or less, more preferably 10 mol% or less, when the cyclic olefin polymer is taken as 100 mol%. When the copolymerization ratio is equal to or less than the upper limit, the optical properties of the obtained resin composition and the molded article obtained from the resin composition are improved, and optical components with higher accuracy can be obtained.

[0051] Examples of other copolymerizable monomers include aromatic vinyl compounds. Aromatic vinyl compounds include styrene and its derivatives. Styrene derivatives are compounds in which other groups are bonded to styrene, and examples of such compounds include alkylstyrenes such as o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, o-ethylstyrene, and p-ethylstyrene, hydroxystyrene, t-butoxystyrene, vinylbenzoic acid, vinylbenzyl acetate, o-chlorostyrene, and p-chlorostyrene, which are substituted styrenes in which a hydroxyl group, an alkoxy group, a carboxyl group, an acyloxy group, or a halogen is introduced into the benzene nucleus of styrene, and vinylbiphenyl compounds such as 4-vinylbiphenyl and 4-hydroxy-4'-vinylbiphenyl. Among these, from the viewpoint of the optical properties of the resulting molded article, monomers having a benzene ring unit are preferred, such as styrene and its derivatives.

[0052] In addition, the type of the copolymer of ethylene or α-olefin and cyclic olefin according to the present embodiment is not particularly limited, but various known copolymer types such as random copolymers, block copolymers, alternating copolymers, etc. can be applied. Among them, random copolymers are preferred.

[0053] (Ring-opening polymer of cyclic olefin) As described above, the cyclic olefin polymer according to the present embodiment includes at least one selected from the copolymer of ethylene or α-olefin and cyclic olefin, and the ring-opening polymer of cyclic olefin. Hereinafter, the ring-opening polymer of cyclic olefin will be described. Examples of the ring-opening polymer of a cyclic olefin include a ring-opening polymer of a norbornene monomer, a ring-opening polymer of a norbornene monomer and another monomer capable of ring-opening copolymerization with the norbornene monomer, and hydrogenated products thereof, and examples thereof include the norbornene-based polymers described in Japanese Patent No. 6256353.

[0054] Examples of the norbornene monomer include norbornene-based monomers, tetracyclododecene-based monomers, dicyclopentadiene-based monomers, and methanotetrahydrofluorene-based monomers.

[0055] <Dye (B)> The resin composition for the lens of the present embodiment contains a dye (B). The dye (B) will be described below.

[0056] The content of the dye (B) in the resin composition for the lens of this embodiment is L * a * b * L in color space * , a * and b * From the viewpoint of easily controlling the value within a predetermined range, the amount is preferably 0.0003 parts by mass or more, more preferably 0.001 parts by mass or more, even more preferably 0.0015 parts by mass or more, and even more preferably 0.002 parts by mass or more, relative to 100 parts by mass of the aforementioned resin (A), and is preferably 0.03 parts by mass or less, more preferably 0.015 parts by mass or less, even more preferably 0.01 parts by mass or less, even more preferably 0.0080 parts by mass or less, and even more preferably 0.004 parts by mass or less.

[0057] The dye (B) is not particularly limited, and any known dye can be used. * a * b * L in color space * , a * and b * From the viewpoint of easily controlling the value within a predetermined range, it is preferable to include a tetraazaporphyrin compound described in JP-A-2011-221456, and more preferably to include a compound represented by the following general formula (1).

[0058] [ka] (In the above general formula (1), R 1 and R 2 , R 3 and R 4 , R 5 and R 6 And R 7 and R 8 Each of R represents a hydrogen atom or a linear, branched or cyclic alkyl group. 1 and R 2 , R 3 and R 4 , R 5 and R 6 And R 7 and R 8 Each of the elements cannot be the same. M represents Cu or VO.)

[0059] The tetraazaporphyrin compound includes all R 1 ~R 8 Any combination of M's described in the publication may be used. Among them, in the general formula (1), R 1 , R 3 , R 5 and R 7 is a linear, branched or cyclic alkyl group, and R 2 , R 4 , R 6 and R 8Compounds where is H and M is VO; R 1 , R 3 , R 5 and R 7 is a linear, branched or cyclic alkyl group, and R 2 , R 4 , R 6 and R 8 is H and M is Cu; R 1 , R 3 , R 5 and R 7 is a linear, branched or cyclic alkyl group, and R 2 , R 4 , R 6 and R 8 is F and M is Cu; R 1 , R 3 , R 5 and R 7 is a linear, branched or cyclic alkyl group, and R 2 , R 4 , R 6 and R 8 is -OCH2CF3 and M is Cu; R 1 , R 3 , R 5 and R 7 is a linear, branched or cyclic alkyl group, and R 2 , R 4 , R 6 and R 8 is -CN and M is Ni; and R 1 , R 3 , R 5 and R 7 is a phenyl group, and R 2 , R 4 , R 6 and R 8 is an n-butyl group, and M is VO; R 1 , R 3 , R 5 and R 7is a tert-butyl group, and R 2 , R 4 , R 6 and R 8 More preferably, the compound includes a compound in which is a hydrogen atom and M is Cu.

[0060] The compound represented by the general formula (1) can be produced, for example, by the method described in JP-A-2011-221456.

[0061] Furthermore, the dye (B) may contain a compound other than the compound represented by formula (1).

[0062] <Other ingredients> The resin composition for the lens of the present embodiment may contain components other than the resin (A) and dye (B) as long as the effects of the present invention are not impaired. Examples of such components include phenol-based stabilizers, higher fatty acid metal salts, antioxidants, ultraviolet absorbers, hindered amine-based light stabilizers, hydrochloric acid absorbers, metal deactivators, antistatic agents, antifogging agents, lubricants, slip agents, nucleating agents, plasticizers, flame retardants, phosphorus-based stabilizers, etc., which can be blended to an extent that does not impair the object of the present invention, and the blending ratio is an appropriate amount.

[0063] <L * a * b * L in color space * , a * and b * Value of > The resin composition for the lens of the present invention is a resin composition having a thickness of 1 mm, and the resin composition is used in a flat plate having a thickness of L * a * b * L in color space * , a * and b * The values ​​are within the following ranges. L * :80 or more and 95 or less a * :-5 or more and 5 or less b * :-20 or more -5 or less

[0064] The above L * The value of L is 80 or more and 95 or less, preferably 82 or more and 92 or less, and more preferably 85 or more and 90 or less. * If the value is within the above range, the image will not become unnaturally dark. * The value can be controlled by the type and amount of the resin (A) and dye (B) used.

[0065] Above a * The value of is -5 or more and 5 or less, preferably -3 or more and 3 or less, more preferably -2 or more and 2 or less, and further preferably -1 or more and 1.5 or less. * When the value of is within the above range, the image does not have unnatural coloring and color noise can be effectively suppressed. * The value can be controlled by the type and amount of the resin (A) and dye (B) used.

[0066] Above b * The value of is -20 or more and -5 or less, preferably -16 or more and -7 or less, and more preferably -14 or more and -10 or less. * When the value of is within the above range, the image does not have unnatural coloring and color noise can be effectively suppressed. * The value can be controlled by the type and amount of the resin (A) and dye (B) used.

[0067] <Water absorption rate> The resin composition for the lens of this embodiment has a water absorption rate of 0.15% or less, measured in accordance with ASTM D570 by immersing a 1 mm-thick flat plate made of the resin composition in distilled water at a temperature of 23° C. for 24 hours. A water absorption rate of 0.15% or less increases the stability of the molded article and lens made of the resin composition of the present invention under high humidity conditions, which is preferable from the viewpoint of reliability under high humidity environments. The water absorption rate is preferably 0.10% or less, and more preferably 0.05% or less. The lower limit of the water absorption rate is not particularly limited, but may be, for example, 0.000% or more, or 0.001% or more. The water absorption rate can be controlled by the type of resin (A) in the resin composition, or by the ratio of two or more resins when the resin (A) is a combination of these resins, etc. Specifically, for example, when the resin (A) contains at least one selected from a copolymer of an α-olefin and a cyclic olefin, and a ring-opening polymer of a cyclic olefin, the water absorption rate tends to decrease.

[0068] [Optical components] The optical member of this embodiment will be described below.

[0069] The optical member of the present embodiment includes the above-described lens.

[0070] An example of the optical member is a lens module (lens unit) that includes a plurality of lenses and, if necessary, electronic components. When the optical member of the present embodiment is a lens module (lens unit), the number of lenses in the lens module (lens unit) is not particularly limited and may be 2, 4, 6, 10 or more. Furthermore, the installation position of the lens of the present invention in a lens configuration consisting of multiple lenses is not particularly limited, and the number of the lens of the present invention in the lens configuration may be one or two or more.

[0071] [Imaging camera] The imaging camera of this embodiment will be described below.

[0072] The imaging camera of this embodiment includes the optical member described above, and preferably includes a lens module (lens unit). The imaging camera is not particularly limited as long as it includes the optical member described above, and may be a digital camera or a film camera. In addition, the imaging camera may be a still camera, a video camera, an imaging camera mounted on a device such as a notebook computer, a tablet, or a smartphone, or an imaging camera used by being attached externally to these devices.

[0073] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above can also be adopted. Furthermore, the present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of the present invention that can achieve the object of the present invention are included in the present invention. EXAMPLES

[0074] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the following examples as long as it does not depart from the gist of the present invention.

[0075] In the examples and comparative examples, the following raw materials were used.

[0076] <Resin> Resin 1: Ethylene and cyclic olefin (tetracyclo[4.4.0.1 2,5 .1 7,10 ]-3-dodecene) (manufactured by Mitsui Chemicals, product name: APEL 5014CL: MFR: 36g / 10min (260°C, 2.16kg load, compliant with ASTM D1238), Tg: 135°C).

[0077] <Dye> Dye 1: In the following general formula (1), R 1 and R 2 , R 3 and R 4 , R 5 and R 6 , R 7 and R 8 In each combination of 2 , R 4 , R 6 , R 8 ) is a hydrogen atom, the other (R 1 , R 3 , R 5 , R 7 ) is a tert-butyl group and M is Cu.

[0078] [ka]

[0079] Dye 2: (4Z)-4-[6-(2-ethylhexanoylamino)-2,3,3-trimethyl-1-octyl-2H-indol-1-ium-5-ylidene]-3-oxo-2-[6-(2-ethylhexanoylamino)-2,3,3-trimethyl-1-octyl-2H-indol-5-yl]cyclobuten-1-olate

[0080] Pigment 3:2-(5-chlorobenzotriazol-2-yl)-5-(ethylamino)-4-methylphenol

[0081] Pigment 4:2-tert-butyl-4-methyl-6-(5-octylsulfanylbenzotriazol-2-yl)phenol

[0082] [Example 1] 0.003 parts by mass of the dye 1 was added to 100 parts by mass of the pellets made of the resin 1, and the mixture was melt-kneaded using a twin-screw extruder (manufactured by Japan Steel Works, Ltd.: TEX44) at a cylinder temperature of 260°C and a rotation speed of 150 rpm to obtain a resin composition 1. The obtained resin composition 1 was injection-molded using an injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd.: model name: SE30DUZ) at a cylinder temperature of 260°C, an injection pressure of 600 bar, and a mold temperature of 130°C to produce a flat plate with a thickness of 1 mm and a lens with a thickness of 1.2 mm at the thickest part. The obtained lens was combined with five other lenses and a sensor to produce an imaging camera. The imaging camera we created was configured as follows, from the subject side: the obtained lens, five other lenses, and a sensor.

[0083] [Comparative Example 1] A flat plate, a lens and an imaging camera were prepared in the same manner as in Example 1, except that dye 1 was not added.

[0084] [Comparative Example 2] A flat plate, a lens, and an imaging camera were prepared in the same manner as in Example 1, except that 0.006 parts by mass of dye 2 was added instead of dye 1.

[0085] [Comparative Example 3] A flat plate, a lens, and an imaging camera were prepared in the same manner as in Example 1, except that 0.024 parts by mass of dye 3 and 0.1 parts by mass of dye 4 were added instead of dye 1.

[0086] [Comparative Example 4] A flat plate, a lens, and an imaging camera were prepared in the same manner as in Example 1, except that instead of dye 1, 0.006 parts by mass of dye 2, 0.024 parts by mass of dye 3, and 0.1 parts by mass of dye 4 were added.

[0087] [Hue rating] The obtained flat plate was measured for L according to JIS Z 8781-4:2013 using a spectroscopic haze meter SH7000 manufactured by Nippon Denshoku Industries Co., Ltd. * , a * and b * The results of measuring the values ​​are shown below.

[0088] [Table 1]

[0089] [Color noise evaluation] Using the obtained imaging camera, an exterior shot was taken so that a building with a white exterior wall was captured. The subject, the exterior wall of the building, was trimmed so that nothing other than the exterior wall of the building was captured and the number of pixels was 630. Within the total of 630 pixels of the trimmed image of the exterior wall of the building, the area with a hue angle ranging from 20 degrees to 60 degrees was defined as color noise, and the number of pixels corresponding to color noise was counted.

[0090] [Table 2]

[0091] In Example 1, the number of pixels corresponding to color noise was 0, whereas in Comparative Examples 1 to 4, the number of pixels corresponding to color noise exceeded 10. This shows that the lens according to this embodiment improves reliability under high humidity conditions and provides an imaging camera in which the occurrence of color noise is suppressed.

[0092] Here, in the methods described in Patent Documents 1 and 2, etc., it may be necessary to add a driving system or the like to correct color noise, which may result in an increase in the size of the imaging device, or the power consumption of the device may increase due to complex image processing. On the other hand, this example shows that the lens of this embodiment can provide an imaging camera in which the generation of color noise is suppressed. This shows that the lens of this embodiment can take measures against color noise without using an additional driving system or the like or image processing technology.

[0093] [Comparative Example 5] A flat plate was produced in the same manner as in Example 1, except that Resin 1 was replaced with Resin 2 (polycarbonate, manufactured by Sumika Polycarbonate Co., Ltd., product name: SD2173M).

[0094] [Evaluation of water absorption rate] The obtained flat plate was immersed in distilled water at 23° C. for 24 hours in accordance with ASTM D570, and the water absorption rate was calculated from the rate of change in mass before and after immersion.

[0095] [Table 3]

[0096] Example 1, which used a cyclic olefin copolymer, had a water absorption rate of less than 0.05%, while Comparative Example 5, which used polycarbonate, had a high water absorption rate of 0.20%. This shows that the use of a cyclic olefin copolymer reduces the water absorption rate.

Claims

1. Resin (A) and Pigment (B) and, A lens comprising a molded body of a resin composition containing, A 1 mm thick flat plate made of the aforementioned resin composition was measured in accordance with JIS Z 8781-4:2013. ＊ a ＊ b ＊ L in color systems ＊ a ＊ and b ＊ Lenses whose values ​​are within the following ranges. L ＊ 80 and below a ＊ -5 or more, less than 5 b ＊ -20 or more -5 or less

2. The lens according to claim 1, wherein the resin (A) includes a thermoplastic resin.

3. The lens according to claim 1 or 2, wherein the resin (A) comprises at least one selected from the group consisting of copolymers of α-olefins and cyclic olefins, and ring-opening polymers of cyclic olefins.

4. The lens according to claim 1 or 2, wherein the resin (A) has a constituent unit (a) derived from a cyclic olefin represented by the following general formula [I]. 【Chemistry 1】 (In the above general formula [I], n is 0 or 1, m is 0 or a positive integer, and q is 0 or 1. When q is 1, R ａ and R ｂ Each of these is independently one of the following atoms or hydrocarbon groups, and when q is 0, the bonds between them combine to form a five-membered ring. １ ~R １８ And R ａ and R ｂ Each of these is independently a hydrogen atom, a halogen atom, or a hydrocarbon group which may be substituted with a halogen atom. Here, the halogen atom is a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.

5. The aforementioned resin (A) is composed of ethylene and tetracyclo[4.4.0.1 ２，５ 1. ７，１０ The lens according to claim 1 or 2, comprising a copolymer with ]-3-dodecene.

6. The lens according to claim 1 or 2, wherein the dye (B) comprises a compound represented by the following general formula (1). 【Chemistry 2】 (In the above general formula (1), R １ and R ２ , R ３ and R ４ , R ５ and R ６ And R ７ and R ８ Each of these represents a hydrogen atom or a linear, branched, or cyclic alkyl group. However, R １ and R ２ , R ３ and R ４ , R ５ and R ６ And R ７ and R ８ None of them are the same. (M represents Cu or VO.)

7. In the above general formula (1), R １ , R ３ , R ５ and R ７ is a tert-butyl group, R ２ , R ４ , R ６ and R ８ The lens according to claim 6, wherein is a hydrogen atom and M is Cu.

8. The lens according to claim 1 or 2, wherein the content of the dye (B) per 100 parts by mass of the resin (A) is 0.0003 parts by mass or more and 0.03 parts by mass or less.

9. An optical component comprising the lens described in claim 1 or 2.

10. An imaging camera comprising the optical element described in claim 9.

Images