Camera lens components

Abstract

To provide a camera lens component which reduces stress on a lens and is less likely to cause birefringence and create a gap with the lens.SOLUTION: A camera lens component of the present invention is made of a resin composition comprising a polyphenylene ether-based resin, a crystalline resin, and an inorganic filler.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a camera lens component. [Background technology]

[0002] In recent years, from the viewpoint of reducing the weight and cost of cameras, attempts have been made to construct lens components, such as a lens barrel that holds a lens, from resin (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 186103 [Patent Document 2] Patent No. 5146319 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional lens components such as lens barrels made of resin materials have a linear expansion coefficient that changes significantly near the glass transition temperature of the resin, and this difference in linear expansion coefficient can cause dimensional differences between the lens installed inside the lens component and the lens component itself, resulting in problems such as stress being applied to the lens, causing birefringence, or gaps being generated between the lens and the lens component, which can cause the lens to shift position and reduce image accuracy.

[0005] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a camera lens component that can reduce the stress applied to the lens, is less likely to cause birefringence, and is less likely to cause gaps between the lens and the component. [Means for solving the problem]

[0006] That is, the present invention is as follows. [1] A resin composition comprising a polyphenylene ether resin, a crystalline resin, and an inorganic filler.the law of nature, When the temperature is increased from -30°C to 120°C and the temperature is divided into temperature ranges in increments of 10°C, the lower temperature side of two adjacent temperature ranges is called the low temperature range and the higher temperature side is called the high temperature range, the low temperature linear expansion coefficient (mm / mm / °C) in the TD direction of the resin composition measured in accordance with ISO 11359 in the low temperature range and the high temperature linear expansion coefficient (mm / mm / °C) in the TD direction of the resin composition measured in accordance with ISO 11359 in the high temperature range satisfy the following relationship in any of the two adjacent temperature ranges: The mass ratio of the crystalline resin in 100 mass% of the resin composition is 20 to 55 mass%, and the mass ratio of the inorganic filler is 20 to 60 mass%. A camera lens component comprising: -50≦((Linear expansion coefficient in high temperature range - Linear expansion coefficient in low temperature range) / Linear expansion coefficient in low temperature range)×100≦50 [2] The temperature is increased from -30°C to 120°C in 10°C increments. The linear expansion coefficient of the resin composition in the TD direction measured in accordance with ISO 11359 in each temperature range is determined to be 10 × 10. -5 mm / mm / ℃ or less, [1 ] The camera lens component described above. [3] The crystalline resin is polyphenylene sulfide. [1] or [2] The camera lens component according to claim 1. [4] [1] to [2], wherein the dimensional change rate in the TD direction of the resin composition after being left standing for 1000 hours under conditions of 85°C and 85% RH is within ±0.05%. [3] 10. A camera lens component according to claim 9, wherein: [5] The resin composition further contains an amorphous resin other than the polyphenylene ether-based resin, [1] to [4] 10. A camera lens component according to claim 9, wherein: [6] The camera lens component according to any one of [1] to [5], wherein the phase containing the polyphenylene ether resin forms a dispersed phase, the phase containing the crystalline resin forms a continuous phase, and the phase containing the polyphenylene ether resin exists as a dispersed phase having an average diameter of 0.1 to 5 μm. [Effects of the Invention]

[0007] The camera lens component of the present invention has the above-described configuration, so that the stress acting on the lens can be reduced, birefringence is less likely to occur, and gaps are less likely to occur between the lens and the component. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram of ISO-A dumbbell test pieces prepared in Examples and Comparative Examples. [Figure 2]FIG. 2 is an explanatory view of cylindrical test pieces prepared in Examples and Comparative Examples. [Figure 3] FIG. 10 is an explanatory diagram of a method for evaluating optical distortion after heating. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0010] [Camera lens components] The camera lens component of this embodiment is made of a resin composition containing a polyphenylene ether resin, a crystalline resin, and an inorganic filler. In this specification, polyphenylene ether resins may be referred to as "PPE resins."

[0011] The camera lens component of this embodiment contains a polyphenylene ether resin, which can reduce the difference between the low-temperature linear expansion coefficient (mm / mm / °C) in the TD direction of the resin composition measured in accordance with ISO 11359 in a wide temperature range (e.g., −30 to 120°C) divided into temperature ranges in 10°C increments, with the lower temperature side of any two adjacent temperature ranges defined as the low-temperature range and the higher temperature side defined as the high-temperature range (mm / mm / °C) in the TD direction of the resin composition measured in accordance with ISO 11359 in a high-temperature range (sometimes referred to herein as “variation in linear expansion coefficient”). This can reduce stress on the lens due to shrinkage caused by temperature changes, making it less likely to cause optical distortion such as birefringence. Furthermore, expansion caused by temperature changes does not create a gap with the lens, reducing the likelihood of lens positional deviation. Furthermore, by including a polyphenylene ether resin and a crystalline resin, the variation in the linear expansion coefficient over a wide temperature range can be further reduced, and the molded appearance and heat resistance are excellent. Furthermore, by including an inorganic filler in addition to the polyphenylene ether resin and the crystalline resin, the dimensional accuracy is further improved.

[0012] Examples of the camera lens components include a lens barrel, a spacer, a housing, etc. Among these, a component that comes into contact with a camera lens is preferred, a component that houses the lens and comes into contact with the lens is more preferred, and a lens barrel is even more preferred.

[0013] The camera lens component of this embodiment may consist solely of the resin composition, or may consist of the resin composition and other materials (for example, a resin or resin mixture other than the resin composition, a metal, etc.). In particular, from the viewpoint of achieving even better dimensional stability over a wide temperature range (for example, −30 to 120°C), it is preferable that the portion that comes into contact with the camera lens consists solely of the resin composition. From the same viewpoint, it is also preferable that the resin-containing portion of the lens component consists solely of the resin composition, and it is more preferable that the entire lens component consists solely of the resin composition.

[0014] <Resin composition> The resin composition contains a polyphenylene ether resin, a crystalline resin, and an inorganic filler, and may further contain other components.

[0015] (Polyphenylene ether resin) The polyphenylene ether resin is preferably a homopolymer consisting of a repeating unit represented by the following formula (1) or a copolymer containing a repeating unit represented by the following formula (1). The copolymer is a copolymer having the repeating unit represented by the following formula (1) as the main repeating unit (for example, a copolymer in which the mass proportion of the repeating unit represented by the following formula (1) is more than 50 mass % (preferably 70 mass % or more) relative to 100 mass % of the copolymer). The polyphenylene ether resins may be used singly or in combination of two or more. [ka] (In the formula, R1, R2, R3, and R4 are each independently a monovalent group selected from the group consisting of a hydrogen atom, a halogen atom, a primary or secondary lower alkyl group having 1 to 7 carbon atoms, a phenyl group, a haloalkyl group, an aminoalkyl group, a hydrocarbonoxy group, and a halohydrocarbonoxy group in which at least two carbon atoms separate the halogen atom from the oxygen atom, and may be the same or different. Furthermore, n is an integer of 1 or greater.)

[0016] Specific examples of the polyphenylene ether resin include, but are not limited to, poly(2,6-dimethyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-phenyl-1,4-phenylene ether), poly(2-methyl-6-n-butyl-1,4-phenylene ether), poly(2-methyl-6-chloroethyl-1,4-phenylene ether), poly(2-methyl-6-hydroxyethyl-1,4-phenylene ether), poly Examples of the copolymers include homopolymers such as poly(2-ethyl-6-n-propyl-1,4-phenylene ether), poly(2-ethyl-6-isopropyl-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether), poly(2,6-diethyl-1,4-phenylene ether), and poly(2,6-di-n-propyl-1,4-phenylene ether); and copolymers such as copolymers of 2,6-dimethylphenol and other phenols (for example, 2,3,6-trimethylphenol and 2-methyl-6-butylphenol). Among these, poly(2,6-dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferred, and poly(2,6-dimethyl-1,4-phenylene ether) is more preferred, from the viewpoint of having a stable linear expansion coefficient over a wide temperature range (for example, −30 to 120°C) and being able to further suppress dimensional changes due to large expansion and contraction at specific temperatures.

[0017] The polyphenylene ether resin can be produced by a known method. The method for producing the polyphenylene ether resin is not particularly limited, and for example, it can be easily produced by oxidatively polymerizing 2,6-xylenol using a complex of cuprous salt and amine by Hay as a catalyst, as described in U.S. Pat. No. 3,306,874. Other examples include the methods described in U.S. Pat. No. 3,306,875, U.S. Pat. No. 3,257,357, U.S. Pat. No. 3,257,358, JP-B No. 17880 / 1977, JP-A No. 51197 / 1975, and JP-A No. 152628 / 1988.

[0018] The reduced viscosity of the polyphenylene ether resin (unit: dL / g, 0.5 g / dL chloroform solution, 30°C, measured with an Ubbelohde viscometer) is preferably in the range of 0.25 to 0.6, more preferably 0.35 to 0.55. A reduced viscosity in this range provides an excellent balance between fluidity, adhesion to fillers, and the like. The polyphenylene ether resin may be a mixture of two or more polyphenylene ether resins having different reduced viscosities. The reduced viscosity of the polyphenylene ether resin can be controlled by the production conditions such as the amount of catalyst used during polymerization and the polymerization time.

[0019] The polyphenylene ether resin may be a modified polyphenylene ether resin in which some or all of the structural units constituting the polyphenylene ether are modified with an unsaturated or saturated carboxylic acid or a derivative thereof. Examples of the modified polyphenylene ether resin include those described in JP-A-2-276823 (U.S. Pat. No. 5,159,027, U.S. Reissue Patent No. 35,695), JP-A-63-108059 (U.S. Pat. Nos. 5,214,109, 5,216,089), JP-A-59,724, etc. The modified polyphenylene ether resin can be produced, for example, by melt-kneading a polyphenylene ether resin with an unsaturated or saturated carboxylic acid or a derivative thereof in the presence or absence of a radical initiator to cause a reaction. Alternatively, the modified polyphenylene ether resin can be produced by dissolving a polyphenylene ether resin and an unsaturated or saturated carboxylic acid or a derivative thereof in an organic solvent in the presence or absence of a radical initiator and causing a reaction in the solution.

[0020] Examples of unsaturated carboxylic acids or derivatives thereof include maleic acid, fumaric acid, itaconic acid, halogenated maleic acids, cis-4-cyclohexene-1,2-dicarboxylic acid, endo-cis-bicyclo(2,2,1)-5-heptene-2,3-dicarboxylic acid, and the like, as well as acid anhydrides, esters, amides, imides, and the like of these dicarboxylic acids, as well as acrylic acid, methacrylic acid, and the like, as well as esters, amides, and the like of these monocarboxylic acids.

[0021] In this embodiment, examples of the saturated carboxylic acid or its derivative include compounds that can be thermally decomposed at the reaction temperature during production of the modified polyphenylene ether resin to become derivatives of the modified polyphenylene ether resin, such as malic acid and citric acid.

[0022] The mass ratio of the polyphenylene ether resin to the crystalline resin in the resin composition is preferably 40 to 80 parts by mass, more preferably 45 to 75 parts by mass, and even more preferably 50 to 70 parts by mass, of the polyphenylene ether resin per 100 parts by mass of the total mass of the polyphenylene ether resin and the crystalline resin, from the viewpoints of improving molded appearance, further stabilizing the linear expansion coefficient over a wide temperature range (for example, −30 to 120°C), and further suppressing dimensional changes due to large expansion and contraction at specific temperatures.

[0023] The polyphenylene ether resin may be used in the form of a polymer alloy with other resins, such as the amorphous resins described below.

[0024] (crystalline resin) Examples of the crystalline resin include polyamide resin, polyphenylene sulfide, polyolefin resin such as polyethylene or polypropylene, polyester resin such as polyethylene terephthalate or polybutylene terephthalate, etc. Among these, polyamide resin and polyphenylene sulfide are preferred from the viewpoints of molded appearance and heat resistance, and polyphenylene sulfide is more preferred from the viewpoints of being able to suppress dimensional changes due to water absorption and to suppress the occurrence of birefringence. The above crystalline resins may be used alone or in combination of two or more.

[0025] The mass proportion of the crystalline resin in 100% by mass of the resin composition is preferably 20 to 60% by mass, more preferably 25 to 55% by mass, and even more preferably 30 to 50% by mass, from the viewpoint of molded appearance.

[0026] -Polyamide resin- Any polyamide resin can be used as long as it has an amide bond {-NH-C(=O)-} in the repeating unit of the polymer main chain. The polyamide resin is a polymer or copolymer whose main raw materials are, for example, amino acids, lactams, or diamines and dicarboxylic acids.

[0027] Representative examples of raw materials for polyamide resins include amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and para-aminomethylbenzoic acid; lactams such as ε-caprolactam and ω-laurolactam; aliphatic diamines such as tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, 2-methylpentamethylenediamine, nonamethylenediamine, decamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- / 2,4,4-trimethylhexamethylenediamine, and 5-methylnonamethylenediamine; aromatic diamines such as metaxylylenediamine and paraxylylenediamine; 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane, and 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexanone; alicyclic diamines such as benzene, bis(4-aminocyclohexyl)methane, bis(3-methyl-4-aminocyclohexyl)methane, 2,2-bis(4-aminocyclohexyl)propane, bis(aminopropyl)piperazine, and aminoethylpiperazine; aliphatic dicarboxylic acids such as adipic acid, suberic acid, azelaic acid, sebacic acid, and dodecanedioic acid; aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodiumsulfoisophthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid; and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, and 1,3-cyclopentanedicarboxylic acid.

[0028] Among these, polymers of diamines and dicarboxylic acids are preferred, and from the viewpoints of heat resistance and water absorbency, polymers of aliphatic diamines and aliphatic dicarboxylic acids or aromatic dicarboxylic acids, and polymers of aromatic diamines and aliphatic diamines are preferred. Furthermore, the polyamide may be a polyamide containing dicarboxylic acid units containing 60 to 100 mol % of terephthalic acid units and diamine units containing 60 to 100 mol % of aliphatic diamine units having 9 to 12 carbon atoms, or a polyamide containing dicarboxylic acid units containing 60 to 100 mol % of isophthalic acid units and diamine units containing 80 to 100 mol % of aliphatic diamine units having 4 to 10 carbon atoms.

[0029] Specific examples of polyamide resins include polyamide 6, polyamide 66, polyamide 46, polyamide 410, polyamide 56, polyamide 510, polyamide 610, polyamide 612, polyamide 106, polyamide 1010, polyamide 1012, polyamide 11, polyamide 12, polyamide 4T, polyamide 5T, polyamide 6I, polyamide 6T, polyamide 9T, polyamide 10I, polyamide 10T, polyamide MXD6, polyamide MXD10, polyamide PXD6, polyamide PXD10, and polyamide copolymers containing at least two different polyamide components selected from these, or mixtures of these. Among these, polyamide 66, polyamide 6I, polyamide 9T, and polyamide MXD6 are preferred, and polyamide 9T is more preferred, from the viewpoints of molded appearance, heat resistance, and water absorbency.

[0030] -Polyphenylene sulfide- Examples of the polyphenylene sulfide include linear polyphenylene sulfide (hereinafter sometimes abbreviated as "linear PPS") and crosslinked polyphenylene sulfide (hereinafter sometimes abbreviated as "crosslinked PPS").

[0031] --Linear PPS-- The linear PPS is a polymer containing arylene sulfide repeating units represented by the following formula (1) in an amount of usually 50 mol % or more, preferably 70 mol % or more, and more preferably 90 mol % or more. [-Ar-S-] (1) (Here, Ar represents an arylene group, and examples of the arylene group include a p-phenylene group, an m-phenylene group, a substituted phenylene group (the substituent is preferably an alkyl group having 1 to 10 carbon atoms or a phenyl group), a p,p'-diphenylenesulfone group, a p,p'-biphenylene group, a p,p'-diphenylenecarbonyl group, and a naphthylene group.)

[0032] The linear PPS may be a homopolymer containing one type of arylene group as a structural unit, or may be a copolymer obtained by mixing two or more different arylene groups from the viewpoints of processability and heat resistance. Among these, linear polyphenylene sulfide resins having p-phenylene sulfide repeating units as the main structural unit are preferred because they are excellent in processability and heat resistance and are easily available industrially, and PPS containing p-phenylene sulfide repeating units is more preferred, preferably 50 mol % or more, more preferably 70 mol % or more, and even more preferably 90 mol % or more.

[0033] Typical methods for producing the linear PPS include polymerizing a halogen-substituted aromatic compound, such as p-dichlorobenzene, in the presence of sulfur and sodium carbonate; polymerizing in a polar solvent in the presence of sodium sulfide or sodium hydrogen sulfide and sodium hydroxide, or in the presence of hydrogen sulfide and sodium hydroxide or sodium aminoalkanoate; and self-condensation of p-chlorothiophenol. Of these, the preferred method is reacting sodium sulfide with p-dichlorobenzene in an amide solvent such as N-methylpyrrolidone or dimethylacetamide, or a sulfone solvent such as sulfolane. Examples of methods for producing the linear PPS include those described in U.S. Pat. No. 2,513,188, Japanese Patent Publication Nos. 44-27671, 45-3368, 52-12240, 61-225217, U.S. Pat. No. 3,274,165, Japanese Patent Publication No. 46-27255, Belgian Patent No. 29437, and Japanese Patent Publication No. 5-222196, as well as prior art methods exemplified in these documents.

[0034] --Crosslinked PPS-- The crosslinked (including semi-crosslinked) polyphenylene sulfide is obtained by polymerizing the linear polyphenylene sulfide and then further subjecting it to a heat treatment or the like in the presence of oxygen at a temperature below the melting point of the polyphenylene sulfide to promote oxidative crosslinking and thereby appropriately increasing the polymer molecular weight and viscosity.

[0035] The linear PPS and the crosslinked PPS may be acid-modified PPS. The acid-modified PPS herein is obtained by modifying the above-mentioned PPS with an acid compound, and examples of such acid compounds include unsaturated carboxylic acids or their anhydrides, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and maleic anhydride, as well as saturated aliphatic carboxylic acids and aromatic-substituted carboxylic acids. Furthermore, examples of such acid compounds include inorganic acid compounds, such as acetic acid, hydrochloric acid, sulfuric acid, phosphoric acid, silicic acid, and carbonic acid.

[0036] The linear PPS and crosslinked PPS may have a melt viscosity at 300° C. of 1 to 10,000 Pa·s, preferably 50 to 8,000 Pa·s, and more preferably 100 to 5,000 Pa·s. The melt viscosity was measured using a flow tester (Model CFT-500 manufactured by Shimadzu Corporation) under the following conditions: a load of 196 N, die length (L) / die diameter (D) = 10 mm / 1 mm; the PPS was preheated at 300°C for 6 minutes, using JIS K-7210 as the reference test method.

[0037] (inorganic filler) Examples of the inorganic filler include, but are not limited to, fibrous inorganic fillers such as glass fiber, potassium titanate fiber, gypsum fiber, brass fiber, stainless steel fiber, steel fiber, ceramic fiber, and boron whisker fiber; plate-like inorganic fillers such as mica, talc, kaolin, calcined kaolin, and glass flakes; granular inorganic fillers such as titanium oxide, apatite, glass beads, silica, calcium carbonate, and carbon black; and acicular inorganic fillers such as wollastonite and xonotlite. Among these, preferred are fibrous inorganic fillers, plate-like inorganic fillers, and acicular inorganic fillers, more preferred are glass fiber, glass flakes, mica, and talc, and even more preferred are glass fiber, glass flakes, and mica. These inorganic fillers may be used alone or in combination of two or more.

[0038] The mass proportion of the inorganic filler in 100 mass% of the resin composition is preferably 10 to 70 mass%, more preferably 15 to 65 mass%, and even more preferably 20 to 60 mass%.

[0039] (amorphous resin) The resin composition may further contain an amorphous resin other than the polyphenylene ether resin from the viewpoint of improving molding flowability. As the amorphous resin, a polystyrene resin is preferred from the viewpoint of further improving molding flowability when used in combination with a polyphenylene ether resin. The amorphous resins may be used alone or in combination of two or more.

[0040] Examples of the polystyrene resin include a homopolymer of a styrene compound, a copolymer of two or more types of styrene compounds, a rubber-modified styrene resin (high impact polystyrene resin) in which a rubber-like polymer is dispersed in particulate form in a matrix of a polymer of a styrene compound, etc. Among these, a homopolymer of a styrene compound is preferred. The polystyrene resin may be a polystyrene having a stereoregular structure such as atactic polystyrene or syndiotactic polystyrene. Examples of the styrene-based compound include styrene, o-methylstyrene, p-methylstyrene, m-methylstyrene, α-methylstyrene, ethylstyrene, α-methyl-p-methylstyrene, 2,4-dimethylstyrene, monochlorostyrene, and p-tert-butylstyrene.

[0041] (Other ingredients) The resin composition may contain other components in addition to the polyphenylene ether resin, the crystalline resin, the inorganic filler, and the amorphous resin. Examples of the other components include, but are not limited to, stabilizers (e.g., metal-based stabilizers such as zinc oxide and zinc sulfide; hindered phenol-based stabilizers, phosphorus-based stabilizers, hindered amine-based stabilizers, etc.), antioxidants, metal deactivators, crystal nucleating agents, flame retardants (organic phosphate ester compounds, ammonium polyphosphate compounds, silicone-based flame retardants, magnesium hydroxide, aluminum hydroxide, etc.), plasticizers (epoxidized soybean oil, polyethylene glycol, fatty acid esters, fatty acid metal salts, etc.), weather (light) resistance improvers, slip agents, various colorants, release agents, adhesion improvers, antistatic agents, ultraviolet absorbers, compatibilizers such as citric acid, maleic acid, itaconic acid, and anhydrides thereof, etc. The mass proportion of the other components in 100% by mass of the resin composition may be 0 to 5% by mass as the total amount of the other components.

[0042] (Method of producing resin composition) The resin composition can be produced by a conventionally known melt-kneading method using the polyphenylene ether resin, crystalline resin, inorganic filler, and, if necessary, amorphous resin and other components. Examples of the method include melt-kneading using a single-screw extruder, a twin-screw extruder, a roll, a kneader, a Brabender plastograph, a Banbury mixer, etc., but among these, a method using a twin-screw extruder is preferred, and in particular, a method using a twin-screw extruder equipped with an upstream supply port and one or more downstream supply ports is even more preferred. The melt-kneading temperature is preferably within the range of 280 to 360°C.

[0043] <Characteristics of resin composition> In the resin composition used in the camera lens component of this embodiment, when the temperature is increased from -30°C to 120°C and divided into temperature ranges in increments of 10°C, the lower temperature side of two adjacent temperature ranges is defined as the low temperature range and the higher temperature side is defined as the high temperature range, the low temperature range linear expansion coefficient (mm / mm / °C) which is the linear expansion coefficient in the TD direction of the resin composition measured in accordance with ISO 11359 in the low temperature range and the high temperature range linear expansion coefficient (mm / mm / °C) which is the linear expansion coefficient in the TD direction of the resin composition measured in accordance with ISO 11359 in the high temperature range satisfy the following relationship in either of the two adjacent temperature ranges: -50≦((Linear expansion coefficient in high temperature range - Linear expansion coefficient in low temperature range) / Linear expansion coefficient in low temperature range)×100≦50 It is preferable to satisfy the following relationship. By satisfying the above relationship, a large change in the linear expansion coefficient does not occur at a specific temperature (for example, near the glass transition temperature of the resin contained in the resin composition), and the change in the linear expansion coefficient can be kept below a certain level over a wide temperature range from -30°C to 120°C. This means that even when combined with a lens having a relatively uniform linear expansion coefficient regardless of the temperature range, optical distortion and lens positional deviation after heating tend to be less likely to occur. The above relationship is -45≦((Linear expansion coefficient in high temperature range - Linear expansion coefficient in low temperature range) / Linear expansion coefficient in low temperature range)×100≦45 It is more preferable that -40≦((Linear expansion coefficient in high temperature range - Linear expansion coefficient in low temperature range) / Linear expansion coefficient in low temperature range)×100≦40 It is more preferable that: The temperature ranges mentioned above refer to 15 temperature ranges obtained by dividing the temperature range from -30°C to 120°C into 15 groups: -30°C to -20°C, -20°C to -10°C, -10°C to 0°C, ..., 110°C to 120°C. Two adjacent temperature ranges refer to any of the 14 combinations of two adjacent temperature ranges among the 15 divided temperature ranges. The above relationship is to be satisfied for all combinations (14 combinations) of two adjacent temperature ranges selected from the 15 divided temperature ranges. The coefficient of linear expansion in the TD direction of the resin composition measured in accordance with ISO 11359 refers to a value measured using a test piece prepared by the method described in the Examples below under the conditions described in the Examples below.

[0044] The average value of the linear expansion coefficient in the TD direction measured in accordance with ISO 11359 in each temperature range, where the temperature is divided into 15 sections at 10°C intervals when the temperature is increased from -30°C to 120°C (the average value of the 15 linear expansion coefficient values, sometimes referred to as the "average linear expansion coefficient" in this specification), is set to 4 × 10 from the viewpoint of suppressing the occurrence of birefringence. -5 ~10×10 -5 mm / mm / °C, and more preferably 5×10 -5 ~9×10 -5 mm / mm / °C, more preferably 6×10 -5 ~8×10 -5 mm / mm / ℃. The average linear expansion coefficient can be set within the above range by adjusting the type and amount of inorganic filler.

[0045] The resin composition of the present embodiment has a maximum coefficient of linear expansion in the TD direction measured in accordance with ISO 11359 within a temperature range divided into 15 10°C intervals when the temperature is increased from -30°C to 120°C, of ​​10 × 10 -5 mm / mm / °C or less, and more preferably 2 × 10 -5 mm / mm / ℃~8×10 -5 mm / mm / ℃. The maximum value is 10×10 -5When the temperature is mm / mm / °C or less, large dimensional changes can be suppressed, birefringence is less likely to occur, and displacement of the lens is less likely to occur.

[0046] From the viewpoint of being able to suppress the occurrence of optical distortion such as birefringence due to dimensional changes caused by water absorption, the resin composition used in the camera lens component of this embodiment preferably has a dimensional change rate in the TD direction within a range of ±0.05% (i.e., −0.05% or more and +0.05% or less), more preferably −0.04 to +0.04%, after being left standing at 85°C and 85% RH for 1000 hours. The dimensional change rate can be measured by the method described later in the Examples using a test piece prepared by the method described later in the Examples. The dimensional change rate can be reduced by using, for example, a crystalline resin that does not easily absorb water (a crystalline resin that does not contain many hydrophilic structural units).

[0047] <Manufacturing methods for camera lens components> The camera lens component of the present embodiment can be produced by molding the resin composition using a conventionally known method, such as injection molding, metal in-mold molding, outsert molding, blow molding, extrusion molding, sheet molding, film molding, heat press molding, rotational molding, laminate molding, etc. Among these, injection molding is preferred, as it allows for the flexible production of highly designable shapes.

[0048] Camera lens components can be made into a lens unit by fitting a lens in. The lens may be made of plastic (e.g., polycarbonate, polymethyl methacrylate, cyclic olefin resin, etc.) or glass. The camera lens component may be a component in which the lens is made only of a molded product (e.g., a lens barrel) of the above-mentioned resin composition, or a component in which a lens unit consisting of a lens and a lens barrel is bonded onto a substrate.

[0049] The camera lens component of this embodiment preferably has a dispersed form in which a phase containing a polyphenylene ether resin forms a dispersed phase and a phase containing a crystalline resin forms a continuous phase. The dispersed phase containing a polyphenylene ether resin is preferably in a form in which, when the surface or any cross section of the camera lens component is observed with a transmission electron microscope at a magnification of 10,000, the phase containing a polyphenylene ether resin exists as a dispersed phase with an average diameter of 0.1 to 5 μm (preferably 0.1 to 3 μm, more preferably 0.1 to 2 μm). [Example]

[0050] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0051] The materials used in the examples and comparative examples are as follows.

[0052] (Polyphenylene ether resin) PPE: Zylon (registered trademark) S201A (manufactured by Asahi Kasei Corporation)

[0053] (amorphous resin) GPPS: PSJ-Polystyrene (registered trademark) 685 (manufactured by PS Japan Co., Ltd.)

[0054] (crystalline resin) PA9T: It was produced according to the method described in the examples of JP-A No. 2000-212433. 3272.96 g (19.7 mol) of terephthalic acid as the dicarboxylic acid component, 2532.64 g (16.0 mol) of 1,9-nonanediamine and 633.16 g (4.0 mol) of 2-methyl-1,8-octanediamine as diamine components, 73.26 g (0.60 mol) of benzoic acid as an end-capping agent, 6.5 g of sodium hypophosphite monohydrate (0.1% by mass relative to the raw materials), and 6 L of distilled water were placed in a 20 L autoclave and purged with nitrogen. The mixture was stirred at 100°C for 30 minutes, and the internal temperature was raised to 210°C over 2 hours. At this time, the autoclave was pressurized at 22 kg / cm. 2 The reaction was continued for 1 hour, and then the temperature was raised to 230°C. The temperature was then maintained at 230°C for 2 hours, and the steam was gradually released to reduce the pressure to 22 kg / cm. 2 The reaction was carried out while maintaining the pressure at 10 kg / cm over 30 minutes. 2 The temperature was lowered to 0°C and the reaction was continued for another hour, yielding a prepolymer with an intrinsic viscosity [η] of 0.25 dL / g. This was dried at 100°C under reduced pressure for 12 hours and crushed to a size of 2 mm or less. This was then solid-state polymerized at 230°C and 0.1 mmHg for 10 hours to yield polyamide granular polymer. The resulting granular polymer was extruded in a twin-screw extruder with a cylinder temperature set to 330°C to yield pelletized PA9T. Melting point: 304°C, intrinsic viscosity [η]: 1.20 dl / g, end-capping ratio: 90%, terminal amino group concentration: 10 μmol / g, terminal carboxyl group concentration: 60 μmol / g, phosphorus content: 300 ppm PA6I: 1500 g of an equimolar salt of isophthalic acid and hexamethylenediamine and 1.5 mol % excess adipic acid relative to the total equimolar salt components were dissolved in 1500 g of distilled water to prepare a 50 mass % equimolar homogeneous aqueous solution of raw material monomers. The mixture was concentrated by gradually releasing steam to a solution concentration of 70% by mass while stirring at a temperature of 110 to 150°C. The internal temperature was then raised to 220°C. At this time, the autoclave was pressurized to 1.8 MPa. The reaction was continued for 1 hour while maintaining the pressure at 1.8 MPa by gradually releasing steam until the internal temperature reached 245°C. The pressure was then reduced over 30 minutes, and the autoclave was then maintained at a reduced pressure of 650 torr for 10 minutes using a vacuum device, with the final internal temperature of the polymerization reaching 265°C. The mixture was then pressurized with nitrogen and formed into strands from the lower spinneret (nozzle), cooled with water, cut, and discharged as pellets. The pellets were dried at 100°C for 12 hours in a nitrogen atmosphere to obtain polyamide. Mw=20,000, Mw / Mn=2. (B-1: PA6I) PA66: Leona (registered trademark) 1300S (manufactured by Asahi Kasei Corporation) PAMXD6: Reny (registered trademark) #6002 (manufactured by Mitsubishi Engineering Plastics Corporation) PPS-1: A linear PPS with a melt viscosity of 30 Pa·s (measured using a flow tester at 300°C, a load of 196 N, and an L / D ratio of 10 / 1 after holding for 6 minutes), an extractable amount with methylene chloride of 0.7 mass%, and a repeating unit of p-phenylene sulfide with an -SX group content of 32 μmol / g. PPS-2: A cross-linked PPS with a melt viscosity of 60 Pa·s (measured using a flow tester at 300°C, a load of 196 N, and an L / D ratio of 10 / 1 for 6 minutes) and a volatile content of 160 ppm by mass when collected in a molten state at 320°C.

[0055] (inorganic filler) GF: Glass fiber with an average fiber diameter of 13 μm and a cut fiber length of 3 mm GFL: Glass flakes with an aspect ratio of 1.7 and an average particle size of 80 μm Mica: Mica with an aspect ratio of 1.5 and an average particle size of 5 μm

[0056] [Extrusion kneading] Next, the extrusion kneading method will be described. Using a twin-screw extruder (ZSK-25 manufactured by Coperion), the above components were fed through a first feed port of the extruder in the composition shown in Table 1 and melt-kneaded to obtain a resin composition in the form of pellets. The twin-screw extruder was set to a barrel temperature of 270 to 320°C and a screw rotation speed of 300 rpm.

[0057] [Molding] Under the temperature conditions shown in Table 1, an ISO-A dumbbell test piece shown in Figure 1, a 150 mm x 150 mm x 2 mm flat test piece, and a cylindrical test piece shown in Figure 2 were prepared.

[0058] [evaluation] The following measurements were carried out using the molded test pieces obtained in the Examples and Comparative Examples.

[0059] (linear expansion coefficient) A test piece cut out from the ISO-A dumbbell shown in Figure 1 was left to stand for 168 hours in a laboratory controlled at a temperature of 23°C and a humidity of 50%RH. After that, the linear expansion coefficient was measured under the following conditions using a thermomechanical analyzer (TMA, product name TMA / SS6100, manufactured by SII Technology Co., Ltd.) in accordance with ISO11359. After cooling to -40°C under a nitrogen atmosphere (flow rate 100 ml / min) and a compressive load of 3 gf, the specimen was heated to 150°C at a rate of 5°C / min, and the linear expansion coefficient in the TD direction was measured. The linear expansion coefficient was measured in 15 temperature ranges, divided into 10°C intervals from -30°C to 120°C. The highest value of the linear expansion coefficients in the 15 temperature ranges was taken as the maximum linear expansion coefficient (mm / mm / °C), and the average value of the linear expansion coefficients in the 15 temperature ranges (average linear expansion coefficient) (mm / mm / °C) was calculated. Furthermore, when the lower temperature side of any two adjacent temperature ranges among the 15 temperature ranges was defined as the low temperature range and the higher temperature side was defined as the high temperature range, the linear expansion coefficient of the low temperature range (low temperature range linear expansion coefficient (mm / mm / °C)) and the linear expansion coefficient of the high temperature range (high temperature range linear expansion coefficient (mm / mm / °C)) were used to calculate the rate of change in the linear expansion coefficient between the low temperature range and the high temperature range using the following formula, and the value with the largest rate of change was defined as the maximum rate of change (%). (Ratio of change in linear expansion coefficient between low and high temperature ranges) = (|Linear expansion coefficient in high temperature range - Linear expansion coefficient in low temperature range| / Linear expansion coefficient in low temperature range) x 100 The above-mentioned two adjacent temperature ranges refer to 14 combinations of adjacent temperature ranges (for example, a combination of a low temperature range of -30°C to -20°C and a high temperature range of -20°C to -10°C, a combination of a low temperature range of -20°C to -10°C and a high temperature range of -10°C to 0°C, etc.) among the 15 temperature ranges obtained by dividing the temperature range from -30°C to 120°C into 10°C intervals (-30°C to -20°C, -20°C to -10°C, -10°C to 0°C, ..., 110°C to 120°C).

[0060] (Dimensional change due to water absorption) Measurements were carried out using a 150mm x 150mm x 2mm flat test piece. The length of the test piece in the TD direction before heating was measured, and then the test piece was left to stand at 85°C and 85% RH for 1000 hours, after which the length in the TD direction was measured. The dimensional change rate (%) in the TD direction was calculated using the following formula. (Dimensional change rate in the TD direction) (%) = {(length in the TD direction after heating (mm)) - (length in the TD direction before heating (mm))} / (length in the TD direction before heating (mm)) × 100 The TD direction refers to the direction perpendicular to the direction of resin flow.

[0061] (Optical distortion after heating) Three test samples were prepared by placing a 3 mm thick molded piece made of polycarbonate resin on one side of the MD direction of the cylindrical molded products shown in Figure 2 obtained in the Examples and Comparative Examples. They were left to stand for 10 minutes at a temperature of 90°C, 110°C, or 130°C, and then removed from the oven. The optical distortion after heating was evaluated by sandwiching both ends of the cylindrical shape in the MD direction between polarizing plates and visually observing light leakage from behind using the crossed Nicols method (Figure 3). When light leakage from the test samples before heating was evaluated, no light leakage was observed. The light leakage was evaluated according to the following criteria. ○ (Excellent): No light leakage observed in any sample △ (Good): Slight light leakage is observed in at least one sample × (bad): Light leakage in at least one sample

[0062] (Lens position deviation after heating) A 3 mm thick molded piece of polycarbonate resin was placed in contact with the inner diameter of one end of the cylindrically molded camera lens component shown in Figure 2 obtained in the Examples and Comparative Examples, and used as a test sample. The test sample had a cylindrical shape with one end closed where a lens was placed and the other end open. Three of the above test samples were prepared and placed in an oven with the open side facing downwards at a temperature of 90°C, 110°C, or 130°C for 10 minutes, after which the test samples were removed. The lens misalignment was evaluated according to the following criteria. ○ (Excellent): No change in lens position from the initial installation position for any sample △ (Good): The lens position was shifted from the initial position in at least one sample. × (bad): When lifted with at least one sample, the lens came off from the camera lens component.

[0063] [Table 1]

Claims

1. The resin composition comprises a polyphenylene ether resin, a crystalline resin, and an inorganic filler, When the temperature is increased from −30° C. to 120° C. and the lower temperature side of two adjacent temperature ranges is defined as the low temperature range and the higher temperature side is defined as the high temperature range, the low temperature range linear expansion coefficient (mm / mm / ° C.) in the TD direction of the resin composition measured in accordance with ISO 11359 in the low temperature range and the high temperature range linear expansion coefficient (mm / mm / ° C.) in the TD direction of the resin composition measured in accordance with ISO 11359 in the high temperature range satisfy the following relationship in either of the two adjacent temperature ranges: A camera lens component, characterized in that the mass ratio of the crystalline resin is 20 to 55 mass% and the mass ratio of the inorganic filler is 20 to 60 mass% in 100 mass% of the resin composition. −50≦((linear expansion coefficient in high temperature range−linear expansion coefficient in low temperature range) / linear expansion coefficient in low temperature range)×100≦50

2. The temperature is increased from -30°C to 120°C by dividing the temperature into temperature ranges of 10°C each, and the maximum linear expansion coefficient of the resin composition in the TD direction measured in accordance with ISO 11359 in each temperature range is 10 × 10 －５ 2. The camera lens component according to claim 1, wherein the modulus is mm / mm / °C or less.

3. 3. A camera lens component according to claim 1, wherein the crystalline resin is polyphenylene sulfide.

4. 4. The camera lens component according to claim 1, wherein a dimensional change rate in the transverse direction of the resin composition after being left to stand for 1000 hours under conditions of 85°C and 85% RH is within a range of ±0.05%.

5. 5. The camera lens component according to claim 1, wherein the resin composition further contains an amorphous resin other than the polyphenylene ether resin.

6. A camera lens component described in any one of claims 1 to 5, wherein the phase containing the polyphenylene ether resin forms a dispersed phase, the phase containing the crystalline resin forms a continuous phase, and the phase containing the polyphenylene ether resin exists as a dispersed phase with an average diameter of 0.1 to 5 μm.

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