Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/06—Polystyrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/02—Fibres or whiskers
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
  • C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/24—Acids; Salts thereof
  • C08K3/26—Carbonates; Bicarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/02—Fibres or whiskers
  • C08K7/04—Fibres or whiskers inorganic
  • C08K7/14—Glass
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
  • C08L71/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols
  • C08L71/12—Polyphenylene oxides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
  • C08L81/04—Polysulfides

Definitions

• the present invention relates to a resin composition for an optical component and an optical component. More specifically, the present invention relates to a resin composition for an optical component suitable as a material for forming an optical system housing such as an optical pickup device, and an optical component obtained by molding the resin composition with a small optical axis deviation.
• an optical pickup device used to irradiate a light beam, a laser printer, a copying machine, especially high-speed color copying
• the optics housing of the machine has been manufactured by die casting metal such as aluminum or zinc.
• die casting metal such as aluminum or zinc.
• heat resistance and dimensional stability can be improved by using a resin composition having high thermal conductivity composed of polyarylene sulfide and an inorganic filler as a molding material.
• a holding container for an optical pick-up device which is excellent in the above and can suppress the deviation of the optical axis.
• An object of the present invention is to provide a resin composition having high utility as a molding material for an optical component having a small optical axis deviation of an optical system due to a temperature change, and an optical component molded from the molding material. It is. Disclosure of the invention
• the present inventors have conducted intensive studies to solve the above problems, and as a result, have achieved the above object effectively by reducing the anisotropy of the linear expansion coefficient of the resin composition for optical components.
• the present inventors have found that the present invention can be performed, and have completed the present invention based on these findings.
• the gist of the present invention is as follows.
• a resin composition for optical parts comprising (A) a resin component of 30 to 70% by volume of a syndiotactic polystyrene resin, and (B) 70 to 30% by volume of an inorganic filler component. .
• the (B) inorganic filler component is a mixture of (bl) 5 to 30% by volume of a fibrous inorganic filler and (b2) 95 to 70% by volume of a non-fibrous inorganic filler.
• the resin composition for an optical component according to any one of [1] to [3].
• the optical components are used in optical pickup devices, laser printers, or copiers.
• the optical component according to the above [5] which is an optical system housing.
• Fig. 1 shows the light with the optical board molded in the example.
• the resin composition for optical parts in the present invention comprises (al) a resin component composed of a syndiotactic polystyrene resin (A) 30 to 70% by volume, and (B) an inorganic filler component 70 to 30 volume. % Of a resin composition for optical parts.
• the resin component (A) in the resin composition for optical parts comprises (al) 60 to 97 volume% of syndiotactic polystyrene resin and (a 2) 40 to 3 volume% of polyphenylene sulfide resin.
• the (al) syndiotactic polystyrene resin used as the component (A) has a stereochemical structure of a polymer chain formed of a syndiotactic structure, that is, a carbon-carbon bond. It is a polystyrene resin having a steric structure in which phenyl groups, which are side chains, are alternately located in opposite directions to the main chain.
• the tacticity of the syndiotactic polystyrene resin is determined by nuclear magnetic resonance [ 13 C-NMR] using isotope carbon.
• the tacticity measured by the 13 C—NM, R method is the ratio of the presence of a plurality of continuous structural units.
• the syndiotactic-polystyrene resin used as the component (A) in the present invention may be, as the syndiotactic-polystyrene resin, 75% or more, preferably 85% or more in racemic diad, or racemic pentad.
• styrene-based polymer or copolymer examples include polystyrene, poly (alkylstyrene), poly (halogenated styrene), poly (alkylated styrene), poly (alkoxystyrene), and poly (vinyl).
• Benzoic acid esters), hydrides and mixtures thereof, or copolymers containing these as the main component are used.
• poly (alkylstyrene) examples include, for example, poly (methylstyrene), poly (ethylstyrene), poly (isopropyl styrene), poly (shallow butylstyrene), poly (phenylstyrene), There are poly (vinylnaphthalene) and poly (vinylstyrene).
• poly (halogenated styrene) include poly (chlorostyrene), poly (promostyrene), and poly (fluorostyrene).
• poly (octogenated alkylstyrene) includes poly (chloromethylstyrene) and the like
• poly (alekoxystyrene) includes poly (methoxystyrene) and poly (ethoxystyrene).
• particularly preferred styrene-based polymers include polystyrene, poly (p-methylstyrene), poly (m-methylstyrene), poly (p-short-butylstyrene), poly (p-chlorostyrene), Examples include poly (m-chlorostyrene), poly (p-fluorostyrene), hydrogenated polystyrene, and copolymers containing these structural units.
• the method for producing the (al) syndiotactic polystyrene resin is described, for example, in Japanese Patent Application Laid-Open No. 62-187708, that is, in an inert hydrocarbon solvent or in a solvent.
• a method of polymerizing a styrene monomer using a titanium compound and a condensation product of water and trialkylaluminum as a catalyst can be used.
• poly (halogenated alkylstyrene) and hydrides thereof for example, the methods described in JP-A-1146912 and JP-A-11-78505 are used. Can be.
• the (al) syndiotactic polystyrene resin which is a component of the resin composition for an optical component of the present invention, has a weight average molecular weight of 50,000 or more, and is 20 ⁇ by a differential scanning calorimeter. Those having a melting peak temperature of 275 ° C. or less when the temperature is raised in the above range are suitably used.
• the weight-average molecular weight is a value measured at 135 ° C. by gel permeation method using benzene with trichloride as a solvent.
• the weight average molecular weight is less than 50,000
• the resulting resin composition for optical parts may not have sufficient thermal and mechanical properties.
• the weight average molecular weight of the syndiotactic polystyrene resin used as the (al) component is more preferably 100,000 or more, and even more preferably 200,000 or more.
• the (a 2) polyphenylene sulfide resin in the resin composition for an optical component of the present invention a resin having a p-phenylene sulfide unit as a basic repeating unit is preferable, and further, the p-phenylene sulfide unit is preferably used.
• m-phenylene sulfide unit o-phenylene sulfide unit, p 'diphenylene sulfide-one sulfide unit, p, p'-diphenylene sulfone-sulfide unit, p, p '-biphenylene Repetition of one sulfide unit, p, p 'diphenylene ether-sulfide unit, P, P' diphenylene methylene-sulfide unit, p, p 'diphenylene cumenyl-sulfide unit, various naphthyl-one sulfide units, etc. It may contain a unit.
• the (a 2) polyphenylene sulfide resin a resin produced by a method in which a general dihalogeno aromatic compound and a sulfur source are subjected to a condensation polymerization reaction in an organic polar solvent can be used.
• the form of the polymer chain may be substantially linear and have no branched structure or cross-linked structure, or a small amount of a monomer having three or more functional groups during the production. It may be added to introduce a branched structure or a crosslinked structure.
• the resin temperature is 300 ° C.
• T A melt viscosity of 50 to 100,000 voids at a shear rate of 100,000 sec- 1 is preferably used. If the melt viscosity is less than 50 voids, the mechanical strength is low, and if the melt viscosity exceeds 100,000 voids, the resin composition using the same as the component (a2) has a low mechanical strength. Fluidity decreases. Therefore, the dimensional accuracy of the obtained molded body is reduced, and the optical axis shift in the optical system is increased. More preferably, the melt viscosity of the (a 2) polyphenylene sulfide resin is from 50 to 3,000. It's Boise's.
• Examples of the (bl) fibrous inorganic filler in the optical component shelf composition of the present invention include glass fiber, carbon fiber, alumina fiber, silicon carbide fiber, ceramic fiber, potassium titanate whiskers, and zinc oxide whiskers. , Calcium carbonate, whiskers and the like.
• glass fibers, carbon fibers and zinc oxide whiskers are particularly preferred.
• the form of these (bl) fibrous inorganic fillers may be any form such as cloth, mat, bundle cut, short fiber, filament, and whiskers.
• the fiber diameter of these (b 1) fibrous inorganic fillers is preferably 5 to 20 / xm, and the fiber length of the cut and bundled fibers is 0.05 to 5 Omm. Are preferably used.
• the (bl) fibrous inorganic filler which has been subjected to a surface treatment for improving the adhesion to the component (a1) and the component (a2).
• the surface treatment agent used here include commonly used coupling agents, for example, aminopropyltrimethoxysilane, N-3- (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, Titanium-based coupling agents such as sidoxypropyltrimethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxyisopropyltri ( ⁇ -amidoethyl) titanate and isopropyltri (aminoethyl) titanate are preferred.
• the film former a generally used urethane-based, epoxy-based, or polyether-based film former can be used.
• Examples of (b2) the non-fibrous inorganic filler in the resin composition for an optical component of the present invention include talc, carbon black, graphite, titanium dioxide, silica, My power, calcium carbonate, calcium sulfate, and barium carbonate. , Barium sulfate, magnesium carbonate, magnesium sulfate, oxysulfate, tin oxide, alumina, kaolin, silicon carbide, metal powder, glass powder, glass flake, glass beads and the like.
• These (b 2) non-fibrous inorganic fillers are in the form of particles. It may be in the form of powder or powder, and those having a particle size in the range of 0.5 to 100 m are suitably used.
• the non-fibrous inorganic filler similarly to (bl) the fibrous inorganic filler, those treated with the above-mentioned surface treating agent or film former can be used.
• the volume fraction of the component (A) with respect to the entire resin composition is 30 to 70% by volume, and the volume of the component (B) with respect to the entire resin composition.
• the fraction should be 70-30% by volume. It is this
• the volume fraction of the component (A) with respect to the entire resin composition is less than 30% by volume, the fluidity of the resin composition will be reduced, and the injection molding will be hindered. If the volume fraction with respect to the entire resin composition exceeds 70% by volume, the optical axis deviation of an optical component obtained by molding the resin composition becomes large.
• the composition ratio between the component (A) and the component (B) in the present invention is defined by the volume fraction because the ratio of these two components and the resin composition for optical parts are molded.
• the deviation of the optical axis in the obtained optical component is based not on the mass ratio of the two components but on the correlation with the volume ratio.
• this volume fraction is the component (A),
• (B) A value calculated by dividing the mass of each component by the density of each component at 25 ° C and atmospheric pressure.
• the volume fraction of the component (A) with respect to the entire resin composition is set to 30 to 50% by volume
• the volume fraction of the component (B) By setting the volume fraction of the component (B) to the entire resin composition to be 70 to 50% by volume, a resin composition for optical parts having better physical properties can be obtained.
• a resin composition of (al) 60 to 97 volume% of syndiotactic polystyrene resin and (a 2) 40 to 3 volume% of a polyphenylene sulfide resin is used as the component (A) in the present invention.
• the blending ratio of the polyphenylene sulfide resin of the component (a 2) is less than 3% by volume with respect to the component (al) which is the main component, the mechanical strength which is the effect of the addition of the component (a 2) If the improvement of the composition is not sufficient, and if the blending ratio of the component (a2) exceeds 40% by volume, the temperature of the optical component obtained by molding the resin composition for an optical component, for example, a temperature exceeding 80 ° C This is because the deviation of the optical axis when used in the optical system is increased.
• (bl) a fibrous inorganic filler or (b 2) a non-fibrous inorganic filler may be used alone.
• a mixture of (b 1) a fibrous inorganic filler of 5 to 30% by volume and (b 2) a non-fibrous inorganic filler of 95 to 70% by volume has better physical properties.
• a resin composition for optical parts can be obtained.
• the resin composition for an optical component of the present invention it is preferable that (b 1) a fibrous inorganic filler and (b 2) a non-fibrous inorganic filler are used in combination, in which case the (bl) component and (b) 2)
• the proportion of the component (b) is within the above range if the proportion of the component (bl) is less than 5% by volume of the entire component (B).
• a resin composition having an optical strength cannot be obtained, and when the use ratio of the (bl) component exceeds 30% by volume of the entire component (B), the resin composition for an optical component is obtained by molding. This is because the deviation of the optical axis of the used optical component increases.
• the resin composition for an optical component of the present invention comprises the above components (A) and (B) as basic constituent components.
• the resin component (A) and the inorganic component (B) are used as components. It is preferable to add a polymer having a polar group in order to increase the affinity with the porous filler component and improve the adhesive strength between these components.
• the content of the polymer in the component (A) is 0.1 to 10% by mass, preferably 0.5 to 8% by mass, and more preferably 1 to 5% by mass. If the content of this polymer is less than 0.1% by mass, the adhesion between the component (A) and the component (B) may be insufficient, and the content of the polymer within 10% by mass may be insufficient. This is because if the content ratio is set, the adhesiveness of both components can be sufficiently improved.
• Examples of the polymer having a polar group suitable for improving the affinity with the inorganic filler component include an acid anhydride group, a carboxylic acid group, a carboxylic acid ester group, and a carboxylic acid chloride group. , Carboxylic acid amide group, carboxylic acid group, sulfonic acid group, sulfonic acid ester group, sulfonic acid chloride group, sulfonic acid amide group, sulfonic acid group, epoxy group, amino group, imide group, oxazoline group, etc. A polymer having a group is exemplified.
• this polymer examples include those having structural units such as atactic polystyrene, isotactic polystyrene, styrene-based copolymer, polyphenylene ether, and polyvinyl methyl ether as a main chain, a block structural unit, and a graft chain. Is preferably used.
• Polymers that improve the affinity with the inorganic filler component include, for example, maleic anhydride, maleic acid, maleic ester, and maleic anhydride.
• Maleic acid derivatives such as imide, maleimide N-substituted product, maleate; fumaric acid derivatives such as fumaric acid, fumaric acid ester, fumarate; itaconic anhydride, itaconic acid, itaconic acid ester, itaconic acid salt Itaconic acid derivatives; acrylic acid derivatives such as acrylic acid, acrylic acid esters, acrylic acid amides, acrylates; etc .; Methacrylic acid, Methacrylic acid esters, Methacrylic acid amide, Methacrylic acid salts, Glycidyl methacrylic acid By reacting a methacrylic acid derivative such as methacrylic acid.
• maleic anhydride, fumaric acid, and glycidyl methacrylate are particularly preferably used.
• This reaction can be carried out, for example, by a method of melt-kneading at a temperature of 150 to 350 ° C. in a roll mill Banbury mixer or extruder, or in a solvent such as benzene, toluene, or xylene. The method can be performed by a thermal reaction. Further, in order to facilitate this reaction, benzoyl peroxide di-t-butylpropyl oxide, dicumyl peroxide, t_butylperoxybenzoate, azobisisobutyronitrile, azobisisovalerodioxide were added to this reaction system. It is effective to use radical generators such as tolyl and 2,3-diphenyl 2,3-dimethylbutane.
• polystyrene-maleic anhydride copolymer examples include a styrene-maleic anhydride copolymer, a styrene-glycidyl methacrylate copolymer, a terminal ruponic acid-modified polystyrene, and a terminal epoxy-modified polystyrene.
• Terminal oxazoline-modified polystyrene Terminal amine-modified polystyrene, Sulfonated polystyrene, Styrene-based ionomer, Styrene-methyl methacrylate graft copolymer, (Styrene-glycidyl methacrylate) Monomethyl methacrylate-Daraft copolymer , Acid-modified acrylic-styrene-graft copolymer, (styrene-glycidyl methacrylate) -styrene 'graft copolymer, polybutylene terephthalate-polystyrene-graft copolymer, maleic anhydride-modified polystyrene, fuma Modified polystyrenes such as acid-modified polystyrene, glycidyl methacrylate-modified polystyrene, and amine-modified polystyrene; (st
• modified polystyrenes And modified polyphenylene ethers are preferably used.
• the content ratio of the polar group in these copolymers and modified polymers is from 0.01 to 20% by mass, preferably from 0.05 to 10% by mass.
• the content ratio of the polar group is less than 0.01% by mass, the adhesiveness of the component (B) to the inorganic filler is reduced, and when added in a large amount to increase the adhesive strength, the mechanical properties and This is because thermal properties and moldability are reduced, and when the content of the polar group exceeds 20% by mass, compatibility with the component (A) is reduced.
• a release agent generally used for a synthetic resin in addition to the above-mentioned components, a release agent generally used for a synthetic resin, a lubricant, a crystallization nucleating agent, a plasticizer , An antioxidant, an elastomer, a coloring agent, a flame retardant, and the like can be blended in a usual addition ratio.
• a release agent include polyethylene wax / silicone oil, long-chain carboxylic acid, and metal salt of long-chain carboxylic acid.
• crystallization nucleating agent examples include metal salts of carboxylic acids such as aluminum di (pt-butylbenzoate) and metal phosphates such as sodium methylenebis (2,4-di_t_butylphenol) acid phosphate. , Talc and phthalocyanine derivatives are preferred.
• plasticizer examples include polyethylene glycol, polyamide oligomer, ethylene bisstearamide, phthalate, polystyrene oligomer, polyethylene wax, mineral oil, and silicone oil.
• the antioxidant a phosphorus-based, phenol-based, or zeolite-based antioxidant is preferably used.
• the component (A), the component (B) and the additive component are mixed with a mixer or a kneader generally used for mixing or melt-kneading a resin.
• a homogeneous resin composition can be obtained by supplying the mixture to a kneader and melt-kneading.
• it may be molded by known injection molding, extrusion molding, solvent molding, press molding, thermoforming, or the like. Of these molding methods, injection molding is preferred because of its excellent productivity and dimensional accuracy of the molded product.
• the optical component of the present invention obtained by molding in this way includes CD, CD-R, CD-RM, CD-RW, DVD, DV-R, DV-RM, DVD-R Optical pick-up optics used for recording and reproducing information on recording surfaces such as AM System housing, laser's printer, copier's optical housing, chassis etc.
• the optical system housing includes components that accommodate and hold members, such as an optical pickup board and a holding container of the optical pickup device. Since these optical components of the present invention are molded with the above resin composition, even when these components need to have a higher environmental temperature than before, for example, an environmental temperature exceeding 80 ° C., the laser light Axis displacement can be sufficiently suppressed to within an allowable limit.
• each component shown in the above [1] was used at the compounding ratio (mass ratio) shown in Table 1, and as a polymer for improving the affinity with the inorganic filler component, fumaric acid-modified polyphenylene ether was used as (al) 2.0% by mass based on the component, 0.5% by mass of the crystallization nucleating agent [Asahi Denka Kogyo Co., Ltd.
• NA-35 based on the component (al), and a phenolic antioxidant as an antioxidant [Ciba Specialty Chemical Co., Ltd .; Ilganox 1010] was added in an amount of 0.2% by mass based on the component (al), and after dry blending, a twin screw extruder [Toshiba Machine Co., Ltd .; The mixture was melt-kneaded at 300 ° C to obtain pellets of the resin composition for optical components.
• the resin composition for an optical component thus obtained was obtained by calculating the volume fraction of the resin composition (A) contained in the resin composition based on the density and the mixing ratio of the above raw material components. As shown in Table 1.
• the mold temperature was set to 150 ° C, and the injection was performed.
• the optical pick-up board for digital versatile disc was molded at a molding temperature of 300 ° C.
• the magnitude of the deformation of the optical pickup substrate molded in [3] was visually observed, and the dimensional accuracy was evaluated according to the following evaluation criteria.
• the bending strength of the optical pickup substrate formed in [3] above was measured at room temperature in accordance with ASTM D790.
• the evaluation of the optical pickup substrate was performed by mounting the optical pickup substrate obtained in the above [3] on the optical pickup device shown in FIG.
• a semiconductor laser light source 1, a half mirror 12, an objective lens 3, and a light receiving section 5 are held on an optical pickup board 6 mounted in a holding container 9.
• the laser light emitted from the semiconductor laser light source 1 is converged on the recording surface 8 of the optical disk 7 by the objective lens 3 via the half mirror 2 and the collimator lens 4, and from the recording surface 8
• the reflected light is made incident on a light receiving section 5 through an objective lens 3, a collimator lens 4 and a half mirror 12, so that an error signal such as a de-evening signal and a focus error signal is obtained.
• the optical pickup substrate 6 is configured to be able to irradiate one laser beam over the entire recording surface 8 of the optical disk 7 while moving in conjunction with the shaft in the holding container 9.
• the measurement of the optical axis deviation (angle) of the digital versatile disc using this optical pick-up device was performed by fixing the two surfaces of the half mirror horizontally and irradiating it with laser light at 23 ° C. The reflection angle was measured. Then, after the temperature was raised to 90 ° C. and maintained for 10 minutes, the laser was again irradiated with one laser beam, and the reflection angle was measured. The difference between the reflection angle at 90 ° C and the reflection angle at 23 ° C was defined as the optical axis shift (angle, minute).
• the measurement of the reflection angle was performed using a measuring device provided with a non-contact angle measuring mechanism. The resolution of this measurement mechanism is 0.08 minutes.
• a digital versatile disc is set in the optical pickup device of (3) above, and the temperature to which the optical pickup device is exposed is set to 90 ° C. Was evaluated.
• the evaluation criteria here were as follows.
• Table 1 shows the evaluation results of these optical components.
• a resin composition having high utility as a molding material for an optical component having a small optical axis deviation due to a temperature change, and an optical component having a small optical axis deviation molded from the molding material. can do.

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