WO2008032501A1 - Matériau d'élément optique en plastique, et élément optique en plastique et appareil phonocapteur optique utilisant celui-ci - Google Patents

Matériau d'élément optique en plastique, et élément optique en plastique et appareil phonocapteur optique utilisant celui-ci Download PDF

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Publication number
WO2008032501A1
WO2008032501A1 PCT/JP2007/065158 JP2007065158W WO2008032501A1 WO 2008032501 A1 WO2008032501 A1 WO 2008032501A1 JP 2007065158 W JP2007065158 W JP 2007065158W WO 2008032501 A1 WO2008032501 A1 WO 2008032501A1
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WIPO (PCT)
Prior art keywords
optical element
group
plastic optical
light
optical
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PCT/JP2007/065158
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English (en)
Japanese (ja)
Inventor
Yasumitsu Fujino
Hiroko Omori
Original Assignee
Konica Minolta Opto, Inc.
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Publication of WO2008032501A1 publication Critical patent/WO2008032501A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L43/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium or a metal; Compositions of derivatives of such polymers
    • C08L43/04—Homopolymers or copolymers of monomers containing silicon
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0037—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration with diffracting elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B2007/13722—Fresnel lenses

Definitions

  • Plastic optical element material plastic optical element using the same, and optical pickup device
  • the present invention relates to a plastic optical element material suitably used for a plastic optical element and the like, a plastic optical element using the same, and an optical pickup device to which the plastic optical element is applied.
  • optical pickups have been used for recording devices such as players, recorders, and drives that read and record information on MO, CD, DVD, and optical information recording media (hereinafter abbreviated as media).
  • a device is provided.
  • the optical pickup device includes an optical element unit that irradiates a medium with light having a predetermined wavelength emitted from a light source, and receives the reflected light with a light receiving element.
  • the optical element unit transmits the light to a reflection layer of the medium. It has an optical element such as a lens for condensing light by the light receiving element.
  • the optical element of the optical pickup device is preferably made of plastic as a material because it can be manufactured at low cost by means such as injection molding.
  • plastics applicable to optical elements include copolymers of cyclic olefin and ⁇ -olefin (see, for example, Patent Document 1).
  • the optical pickup device has a shape of both media and a wavelength of light to be applied. It is necessary to make the configuration corresponding to the difference. In this case, it is preferable from the viewpoint of cost and pickup characteristics that the optical element unit is common to all the media.
  • Patent Document 1 JP 2002-105131 A (page 4)
  • An object of the present invention is a plastic optical element (hereinafter, also simply referred to as an optical element) capable of improving light stability, being excellent in transparency, and maintaining its characteristics over a long period of time. To provide an optical pickup device having good pickup characteristics using it.
  • a plastic optical element material which is a resin composition containing a bur organic polymer containing at least a metal element and inorganic fine particles.
  • the bur-based organic polymer is composed of at least one silane compound selected from alkoxysilanes containing (meth) atalyloyl groups and acyloxysilanes containing (meth) atalyloyl groups, and the following general formula: 2.
  • the plastic optical element material as described in 1 above which is a polymer obtained from a dehydration-type or dealcohol-type condensate of the metal element represented by (1) with an oxy compound.
  • M represents at least one metal element selected from the group 2 to group 15 metal elements and transition metal elements of the periodic table, and R represents a hydrogen atom or a carbon number;! To 5 And any one of an alkynole group, an amino ano quinole group, an alkenyl group, and an alkoxyalkyl group, and n represents an integer of 2 to 4.
  • the Bull organic polymer contains a Bull monomer and a (meth) ataryloyl group 2.
  • the polymer according to 1 above which is a polymer of at least one selected silane compound and a dehydration-type or dealcohol-type condensation product of an oxy compound of the metal element represented by the general formula (1).
  • Plastic optical element material which is a polymer of at least one selected silane compound and a dehydration-type or dealcohol-type condensation product of an oxy compound of the metal element represented by the general formula (1).
  • the inorganic fine particles are a semiconductor crystal composition, an inorganic oxide, or a mixture of a semiconductor crystal composition and an inorganic oxide; Plastic optical element material.
  • the plastic optical element material according to any one of -5.
  • a plastic optical characterized in that the plastic optical element material according to any one of the above !! to 6 is used, and a predetermined fine structure is provided on at least one optical surface. element.
  • a light transmittance at a wavelength of 400 nm of a molded article having a thickness of 3 mm formed using the plastic optical element material according to any one of 1 to 6 is 85% or more.
  • Plastic optical element
  • An optical pickup device that performs at least! /, Information reproduction and recording on an optical information recording medium, a light source that emits light, and the light emitted from the light source
  • An optical element unit that performs at least one of irradiation to the information recording medium and condensing of the light reflected by the optical information recording medium, and the optical element unit has any of the powers of 7 to 9 above.
  • An optical pickup device comprising the plastic optical element according to item 1.
  • an optical element having improved light stability, excellent transparency, and capable of maintaining its characteristics over a long period of time, and an optical pickup having good pickup characteristics using the optical element
  • the equipment could be provided.
  • FIG. 1 is a side view showing an outline of an optical pickup device 1 according to the present invention.
  • FIG. 2 is a sectional side view of the objective lens 10 according to the present invention.
  • FIG. 3 is a sectional side view of an objective lens 10a according to the present invention.
  • FIG. 4 is a sectional side view of an objective lens 10b according to the present invention.
  • FIG. 5 is a sectional side view of an objective lens 10c according to the present invention.
  • FIG. 6 is a sectional side view of an objective lens 10d according to the present invention.
  • FIG. 7 is a sectional side view of a hologram optical element 10e and an objective lens 10f according to the present invention. Explanation of symbols
  • the plastic optical element material applied to the optical element in the invention according to any one of claims 1 to 5 is a bule-based organic material containing a metal element by a covalent bond in at least a molecular chain thereof.
  • a resin composition comprising a polymer and inorganic fine particles, wherein the Bulle polymer contains a metal element bonded as a metal silane condensate, and the metal silane condensation
  • An optical element manufactured using this plastic optical element material has a high light transmittance and a high stabilization effect against light irradiation. For example, even if it is continuously irradiated with light having a short wavelength of about 4 OOnm. They found that white turbidity and refractive index fluctuations can be suppressed, and that deformation of the optical surface in a high temperature environment of, for example, around 85 ° C can be suppressed for a long time. That is, it has been found that the optical stability and thermal stability of the optical element can be improved, and an element capable of maintaining the characteristics for a long time can be manufactured.
  • the hindered amine stabilizer, the phenol stabilizer, the phosphorus stabilizer, and the thio stabilizer are appropriately selected; By adding to the plastic optical element material described in item 1, it is possible to more effectively suppress fluctuations in the optical characteristics of the molded optical element.
  • the predetermined fine structure is provided on at least one optical surface, and this optical element is defined in claims 1 to 6. Since it is molded using the plastic optical element material described in any one of the above, it has high shape stability against light, heat, and environmental changes, and when deformation occurs in the microstructure. Can be suppressed appropriately.
  • the optical element has high shape stability. Element optics There will be no deterioration of the characteristics. In other words, even if high energy is given to the optical element by condensing, the high shape stability of the optical element makes it possible to suppress deformation of the optical element over a long period of time. It is possible to prevent deterioration of the optical characteristics of the element.
  • the molded body having a thickness of 3 mm molded using the plastic optical element material of the present invention has high shape stability and high energy. Even if light having a wavelength of around 400 nm is transmitted, it is possible to suppress the occurrence of white turbidity, refractive index fluctuations, deformation, etc., in the molded product, whereby the light transmittance around the wavelength of 400 nm can be 85% or more. it can. Accordingly, it can be suitably used as an optical element for an optical information recording medium having a high information density such as a Blu-ray Disc.
  • the plastic optics of the present invention comprising at least a bur organic polymer containing a metal element as a covalent bond in its molecular chain, and inorganic fine particles. Because it is an optical element manufactured using element materials, it has a high stabilization effect against light irradiation.For example, even if it is continuously irradiated with light with a short wavelength of around 400 nm, it can suppress white turbidity and fluctuations in refractive index. Also, for example, optical surface deformation in a high temperature environment of around 85 ° C can be suppressed for a long time. In other words, it is possible to improve the optical stability of the optical element, and to maintain the characteristics for a long time. Therefore, for example, information can be read from and written to optical information recording media having a high information density, such as Blu-ray Disc, with good pickup characteristics over a long period of time, making it a reliable optical pickup device. Can be obtained.
  • optical information recording media having a high information density, such as Blu-ray Disc, with
  • the wavelength of the light emitted from the light source is 390 ⁇ m to 420 nm. That is, for example, even when transmitting light in the range of 390 to 420 nm corresponding to an optical information recording medium having a high information density such as Blue-ray Disc, the resin composition applied to the optical element in the present invention is at least Since it contains a resin composition containing a thermoplastic resin and a curable resin, deterioration of the optical element such as white turbidity and refractive index fluctuation can be prevented. As a result, it is possible to extend the lifetime of the optical element and to obtain a highly reliable optical pick-up device.
  • the plastic optical element material applied to the optical element according to the present invention is at least a metal.
  • the organic polymer contains a metal element bonded as a metal silane condensate in the polymer, and is represented by the metal sila formula (1).
  • optical materials made of plastic have a larger coefficient of thermal expansion than inorganic materials such as glass and ceramics, so the change in the shape of the element is a major problem in applications that are used in high-temperature environments.
  • the present inventors have used the above-described plastic optical element material of the present invention, so that the optical surface can be used even in a high temperature environment of, for example, about 85 ° C. It was found that the deformation of can be suppressed for a long time. Furthermore, the thermal stability of optical elements that have a high stabilization effect against light irradiation, such as maintaining transparency and suppressing white turbidity and refractive index fluctuations even when irradiated with light of a short wavelength near 400 nm, for example. It has been found that it is possible to improve the light stability and to manufacture a device capable of maintaining the characteristics for a long time.
  • the resin quality of the bull organic polymer containing a metal element is not particularly limited, but an acrylic, styrene, acrylic styrene resin, or the like can be suitably used.
  • the acrylic monomers used in the present invention include (meth) acrylic acid alkyl esters, (meth) acrylic acid aryl esters, (meth) acrylic acid alkoxyalkyls, polyvalent acrylic acid esters.
  • Methacrylic acid esters of alicyclic alcohols, epoxy group-containing bull monomers, unsaturated carboxylic acids or partial ester compounds thereof and anhydrides thereof, amide group-containing bull monomers, organic ketone group-containing bull compounds Monomer, etc. Force S These monomers may be used alone or in combination of two or more.
  • acrylic monomers include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) T) butyl acrylate, (meth) acrylate isobutyl, (meth) pentyl acrylate, (meth) hexyl acrylate, (meth) 2-ethylhexyl acrylate, (meth) octyl acrylate, (meth) acryl Lauryl acid, Noel (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, phenyl (meth) acrylate, methoxyethyl acrylate, (meth) ethoxyethyl acrylate, (meth) acrylic Acrylic acid alkyl esters such as propoxychetyl acid, butoxychetyl (meth)
  • styrenic monomer examples include styrene, methylol styrene, dimethylol styrene, trimethylol styrene, ethynol styrene, jetino styrene, triethyl styrene, open pinole styrene, butino styrene, hexino styrene, hexene.
  • Anolequinol styrene such as puchinole styrene and otachinole styrene; Halogenated styrene such as fluoro styrene, chloro styrene, bromo styrene, dibromo styrene, chronole methino styrene; nitro styrene, acetyl styrene, methoxy styrene, ⁇ -methyl styrene And butyltoluene.
  • Examples of the oxy compound of the metal element represented by the general formula (1) include a metal hydroxide or a metal alkoxide.
  • Examples of the metal hydroxide include Be (0 H), Mg (OH), Ca (OH), Zn (OH), Al (OH), Au (OH), Ti (OH), Zr ( ⁇
  • Examples of the metal alkoxide include aluminum ethoxide, aluminum triethoxide, isobutylaluminum methoxide, isobutylaluminum ethoxide, aluminum isopropoxide, isobutylaluminum isopropoxide, aluminum butoxide, aluminum t Butoxide; Tin t Butoxide; Aluminum tri-n-propoxide, Aluminum tri-n Butoxide; Tetraethoxy titanium, Tetra-n-propoxy titanium, Tetra-n-butoxy titanium, Tetra-i-propoxy titanium, Titanium methoxide, Titanium ethoxide , Titanium n propoxide, titanium isopropoxide, titanium n butoxide, titanium isobutoxide; zirconium etoxide, zirconium n propoxide Id, zirconium isopropoxide, zirconium n-butoxide
  • An organic polymer containing a metal element is polymerized using a mixed solution containing a uniformly dispersed metal element as a metal silane condensate in a water / polymerizable monomer dispersion medium. It can be obtained by bonding a metal element through a silane condensate.
  • a predetermined amount of a silane compound of alkoxysilanes and / or acyloxysilanes, a predetermined amount of an oxy compound of a metal element represented by the general formula (1), and an interface A homogeneous mixed solution is prepared by containing the activator and a predetermined amount of the polymerizable monomer already described above.
  • the obtained organic polymer can be a polymer in which a desired metal element is chemically bonded.
  • alkylbenzene sulfonates such as sodium dodecylbenzene sulfonate
  • polyethylene glycol alkyl ethers such as polyethylene glycol nonenyl phenyl ether
  • reactive emulsifiers having a reactive group such as a vinylol group, an acryloyl group, and an aryl group
  • water-soluble polymer compounds such as polybutyl alcohol and polyacrylate.
  • these emulsifiers are usually 0.0;! To 60 parts by weight, preferably 0.;! To 20 parts per 100 parts by weight of a polymerizable monomer such as an acrylic monomer. What is necessary is just to add suitably in the range of a mass part.
  • the average particle diameter is 1 nm or more for ensuring transparency. 50 nm or less is preferable. Further, it is more preferably 1 nm or more, 30 nm or less, or 1 nm or more, and 20 nm or less, force S, and most preferably 1 nm or more and 10 nm or less. If the average particle size is less than 1 nm, it may be difficult to disperse the inorganic fine particles, so that desired performance may not be obtained.
  • the resulting plastic optical element material may become turbid. As a result, the transparency may decrease and the light transmittance may be less than 70%.
  • the average particle diameter here is the diameter when converted to a sphere of the same volume as the particle.
  • the shape of the inorganic fine particles used in the present invention is not particularly limited, but preferably spherical fine particles are used. Further, the particle size distribution is not particularly limited, but in order to achieve the effect of the present invention more efficiently, the particle size distribution has a relatively narrow distribution rather than a wide distribution. Are preferably used.
  • the formula (A) is satisfied when the refractive index of the inorganic fine particles is na and the refractive index of the bull organic polymer is nb. If I na—nb
  • the method for producing inorganic fine particles according to the present invention is not particularly limited, and is not known.
  • a deviation method can also be used.
  • a method using an organic acid or an organic amine in combination is also used to stabilize the fine particles.
  • the surface treatment of the inorganic fine particles is appropriately performed.
  • the inorganic fine particles produced using the sol-gel method can be easily surface treated by adding an appropriate surface modifier when hydrolyzing in an appropriate solvent.
  • Examples of the surface modifier used for the surface treatment include tetramethoxysilane, tetraethoxy.
  • Rutrimethoxysilane ⁇ isocyanatopropyltriethoxysilane, ⁇ — (2-aminoenyltrimethoxysilane, ⁇ — / 3— ( ⁇ -bulbenylaminoethyl) ⁇ —AminoPro
  • Examples include pyrtrimethoxysilane hydrochloride and aminosilane compound, and aluminum, titanium, zirconium oxide, etc. can be used instead of silane. In this case, for example, aluminum triethoxide, aluminum triisoproxide, etc. is there.
  • These compounds have different characteristics such as reaction rate, and compounds suitable for surface modification conditions can be used. Further, only one type may be used or a plurality of types may be used in combination. Furthermore, the properties of the surface-modified fine particles obtained may vary depending on the compound used, and the affinity with the thermoplastic resin used to obtain the material composition can also be achieved by selecting the compound used for the surface modification. is there.
  • the ratio of the surface modification is not particularly limited, but it is preferable that the ratio of the surface modifier is 10 to 99% by mass with respect to the fine particles after the surface modification. Is more preferable.
  • the inorganic fine particles used in the present invention are not particularly limited, but are preferably a semiconductor crystal composition, an inorganic oxide, or a mixture of a semiconductor crystal composition and an inorganic oxide, such as oxide fine particles. Is mentioned. More specifically, for example, titanium oxide, zinc oxide, aluminum oxide, zirconium oxide, hafnium oxide, niobium oxide, tantalum oxide, magnesium oxide, calcium oxide, strontium oxide, barium oxide, yttrium oxide, lanthanum oxide, cerium oxide. Indium oxide, tin oxide, lead oxide, phosphates formed from combinations of these oxides, such as lithium niobate, potassium niobate, lithium tantanolate, etc. Use salt S to raise salt.
  • the semiconductor crystal composition that can be used as the inorganic fine particles according to the present invention is not particularly limited, but a semiconductor crystal composition that does not generate absorption, light emission, fluorescence, or the like in a wavelength region used as an optical element is desirable.
  • Specific composition examples include simple elements of Group 14 elements of the periodic table such as carbon, silicon, germanium and tin, simple elements of Group 15 elements of the periodic table such as phosphorus (black phosphorus), Simple substance of group 16 element of periodic table such as titanium and tellurium, compound of group 14 element of periodic table such as silicon carbide (SiC), tin (IV) (SnO), tin sulfide (11, IV) (Sn (II) Sn (IV) S)
  • Periodic Table Group 15 elements and Periodic Table Group 16 elements copper (I) (Cu 2 0), copper selenide (I) (Cu Se) periodic table 11
  • Compounds of group elements and group 16 elements copper chloride (I) (CuCl), copper bromide (I) (CuBr), copper iodide (I) (Cul), silver chloride (AgCl), bromide
  • Group 11 elements of the periodic table such as silver (AgBr) and Group 17 elements of the periodic table
  • compounds of Group 10 elements of the periodic table such as nickel oxide ( ⁇ ⁇ ⁇ ⁇ ) (NiO) and Group 16 elements of the periodic table Cobalt oxide ( ⁇ ) (CoO ), Cobalt sulfide (II) (CoS), etc.
  • periodic table group 9 element and periodic table group 16 element compound triiron tetroxide (Fe 2 O 3), iron sulfide (IV) (FeS) periodic table, etc.
  • Group 8 elements and Periodic Table Group 16 elements copper chloride (I
  • Periodic Table Group 4 such as compounds of Group 5 elements and Periodic Table Group 16 elements, titanium oxide (TiO, TiO, TiO, TiO, etc.)
  • compound of element and group 16 element of periodic table compound of group 2 element of periodic table such as magnesium sulfide (MgS) and magnesium selenide (MgSe), group 16 element of periodic table, oxidation power dome ( II) Chromium (III) (CdCr O), Cadmium selenide (II) Chromium (III) (CdCr Se), Copper sulfide
  • Chalcogens such as (II) chromium (III) (CuCr S), mercury selenide ( ⁇ ) chromium (III) (HgCr Se)
  • Examples include spinels, norlium titanate (BaTiO 3). G. Schmid et al .; Ad
  • one kind of inorganic fine particles may be used, or a plurality of kinds of inorganic fine particles may be used in combination.
  • one or more stabilizers selected from hindered amine stabilizers, phenol stabilizers, phosphorus stabilizers, and thio stabilizers may be additionally added.
  • these stabilizers and adding them to the plastic optical element material for example, the white turbidity when continuously irradiating light with a short wavelength of, for example, 400 nm, and optical characteristics fluctuations such as refractive index fluctuations can be enhanced. Can be suppressed.
  • a preferable phenol-based stabilizer a conventionally known one can be used, for example, 2-t-butylinole 6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylenophenyl phenyl acrylate, 2 , 4-di-tert-amyl 6- (1- (3,5-di-tert-amyl 2-hydroxyphenyl) ethyl) phenyl acrylate, etc.
  • 2-t-butylinole 6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylenophenyl phenyl acrylate
  • 2-t-butylinole 6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylenophenyl phenyl acrylate
  • 4-di-tert-amyl 6- (1- (3,5-di-tert-amyl 2-hydroxyphenyl) ethyl) phenyl acryl
  • Preferred hindered amine stabilizers include bis (2, 2, 6, 6 tetramethyl-4-piperidyl) sebacate, bis (2, 2, 6, 6 tetramethyl-4-piperidyl) succinate, bis (1, 2, 2, 2, 6, 6 Pentamethyl-4-piperidyl) sebacate, bis (N otatoxi 2, 2, 6, 6 Tetramethyl-4-piperidyl) sebacate, bis (N benzyloxy 2, 2, 6, 6 Tetramethyl-4-piperidyl) sebacate, bis (N Cyclohexyloxy 2, 2, 6, 6 tetramethyl-4-piperidyl) sebacate, bis (1, 2, 2, 6, 6 pentamethyl 4-piperidinole) 2— (3,5 di-t-butyl 4-hydroxybenzenole) 1-2 butyl Malonate, bis (1-atarylloyl-1,2,2,6,6 tetramethyl-1-piperidyl) 2,2bis (3,5 di-tert-butyl-4-hydroxybenzyl) 2
  • preferable phosphorus stabilizers are not particularly limited as long as they are usually used in the general resin industry.
  • triphenyl phosphite diphenyl isodecyl phosphate, phenyl diisodecyl.
  • Phosphite tris (noylphenyl) phosphite, tris (dino-urpheninole) phosphite, tris (2,4 di-t-butylphenol) phosphite, 10— (3,5 di-t-butyl-4-hydroxybenzyl) 9 , 10 Dihydro-9 oxa 10 Phosphaphenanthrene 10 Oxide and other monophosphite compounds; 4, 4, Butylidene bis (3-methyl 6-t butylphenyl tridecyl phosphite), 4, 4, Isopropylidene monobis (Phosphoryl didialkyl (C12-C15) phosphite) and other diphosphite compounds .
  • tris (noyulphenyl) phosphite tris (dinoylphenyl) phosphite, tris (2,4 di-t-butylphenyl) phosphite and the like, which are preferred as monophosphite compounds, are particularly preferable.
  • preferable thio stabilizers include, for example, dilauryl 3,3 thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3-thiodipropionate, lauryl stearyl 3,3-thio.
  • Dipropionate Pentaerythritol Trachy (/ 3 Laurinolethiopropionate), 3, 9 Bis (2 dodecylthioethyl), 2, 4, 8, 10 Tetraoxaspiro [5, 5] undecane It is done.
  • the amount of these stabilizers is appropriately selected within a range that does not impair the object of the present invention.
  • Force 100 parts by weight of resin composition, usually 0.0;! To 2 parts by weight, preferably 0 01 ⁇ ;! The mass part.
  • a surfactant is a compound having a hydrophilic group and a hydrophobic group in the same molecule.
  • the surfactant prevents white turbidity of the plastic optical element material by adjusting the rate of moisture adhesion to the resin surface and the rate of moisture evaporation from the surface.
  • hydrophilic group of the surfactant examples include a hydroxy group, a hydroxyquinol group having 1 or more carbon atoms, a hydroxyl group, a carbonyl group, an ester group, an amino group, an amide group, an ammonium salt, a thiol, and a sulfone.
  • examples thereof include acid salts, phosphates, and polyalkylene glycol groups.
  • the amino group may be any of primary, secondary, and tertiary.
  • the group include an alkyl group having 6 or more carbon atoms, a silyl group having an alkyl group having 6 or more carbon atoms, and a fluoroalkyl group having 6 or more carbon atoms.
  • the alkyl group having 6 or more carbon atoms has an aromatic ring as a substituent! /, Or may be! /.
  • alkyl group examples include hexyl, heptyl, octyl, noel, decyl, undecenyl, dodecyl, tridecinole, tetradecyl, myristyl, stearyl, lauryl, noremityl, cyclohexyl and the like.
  • aromatic ring examples include a phenyl group. This surfactant may have two or more groups as long as it has at least one hydrophilic group and one hydrophobic group as described above in the same molecule.
  • surfactants include myristyl diethanolamine, 2-hydroxyethyl-2-hydroxydodecylamine, 2-hydroxyethyl-2-hydroxytridecylamine, 2 —Hydroxyethyl-2-hydroxytetradecylamine, pentaerythritol monostearate, pentaerythritolorestearate, pentaerythritol tristearate, di-2-hydroxyethyl-2-hydroxydodecylamine, alkyl ( Examples include carbon number 8-18) benzyldimethylammonium chloride, ethylene bisalkyl (carbon number 8-18) amide, stearyl diethanolamide, lauryl diethanolamide, myristyl diethanolamide, palmityl diethanolamide, and the like. Of these, amine compounds or amide compounds having a hydroxyalkyl group are preferably used. In the present invention, two or more of these compounds may be used in combination.
  • the surfactant is added in an amount of 0.01 to 10 parts by mass with respect to 100 parts by mass of the plastic optical element material.
  • the addition amount of the surfactant is less than 0.01 parts by mass, it is impossible to effectively suppress the white turbidity of the molded product due to temperature and humidity fluctuations.
  • the addition amount exceeds 10 parts by mass, the light transmittance of the molded product becomes low, making it difficult to apply to the optical pickup device.
  • the addition amount of the surfactant is preferably 0.05 to 5 parts by mass and more preferably 0.3 to 3 parts by mass with respect to 100 parts by mass of the alicyclic hydrocarbon-based polymer.
  • a polymer derived from a hydrocarbon having one or two unsaturated bonds specifically For example, polyethylene, polypropylene, polymethylol butter, and poly-4-methylol can be used. These polyolefins have a crosslinked structure!
  • Halogen-containing bulle polymer examples include polychlorinated bulls, polyvinylidene chloride, polyfluorinated bulls, polychloroprene, and chlorinated rubber.
  • Polymers derived from ⁇ , ⁇ unsaturated acids and their derivatives specifically polyacrylates, polymethacrylates, polyacrylamides, polyacrylonitriles, or copolymers of the above-mentioned polymers. Examples thereof include acrylonitrile 'butadiene' styrene copolymer, acrylonitrile 'styrene copolymer, acrylonitrile' styrene 'acrylate ester copolymer, and the like.
  • a polymer derived from an epoxide specifically, a polymer derived from polyethylene oxide or bisglycidyl ether.
  • Polyacetals specifically, polyoxymethylene, polyoxyethylene, polyoxymethylene containing ethylene oxide as a comonomer, and the like.
  • Polyesters derived from dicarboxylic acids and dialcohols and / or oxycarboxylic acids or corresponding latatones such as polyethylene terephthalate, polybutylene terephthalate, poly 1,4 dimethylolone cyclohexane terephthalate, etc. It is done.
  • Aldehyde and phenol, urea or melamine force A polymer having a cross-linked structure, specifically, phenol. Formaldehyde resin, urea. Formaldehyde resin, melamine 'formaldehyde resin and the like.
  • Alkyd resin and specific examples include glycerin phthalate resin.
  • Natural polymers such as cellulose, rubber, protein, or derivatives thereof such as cellulose acetate, cellulose propionate, and cellulose ether.
  • Soft polymer for example, a soft polymer containing a cyclic olefin component, an ⁇ -old olefin copolymer, an ⁇ -olefin / gen copolymer, an aromatic bur hydrocarbon / conjugated gen soft Examples thereof include a soft polymer or a copolymer comprising a copolymer, isobutylene or isobutylene conjugation.
  • the method for molding the plastic optical element material of the present invention is not particularly limited, but in order to obtain a molded product having excellent characteristics such as low birefringence, mechanical strength, and dimensional accuracy, a melt molding method is used. Is preferred. Examples of the melt molding method include press molding, extrusion molding, and injection molding. Injection molding is preferable from the viewpoints of moldability and productivity. In molding, first, an organic polymer containing a metal element, inorganic fine particles, and various additives are mixed, and then the molding conditions that can be melted are appropriately selected depending on the purpose of use or the molding method.
  • the temperature of the plastic optical element material in injection molding gives the resin adequate fluidity during molding to prevent sink marks and distortion of the molded product, and to prevent the occurrence of silver streaks due to thermal decomposition of the resin.
  • the range of 150 ° C to 400 ° C is preferable, more preferably 200 ° C to 350 ° C, and particularly preferably 200 ° C. It is in the range of ° C to 330 ° C.
  • the molded product according to the present invention can be used in various forms such as a spherical shape, a rod shape, a plate shape, a columnar shape, a tubular shape, a tubular shape, a fibrous shape, a film or a sheet shape, and has a low birefringence.
  • sex Since it is excellent in transparency, mechanical strength, heat resistance, etc., it is also suitable as a force used as an optical resin lens, which is one of the optical elements of the present invention, and other optical components.
  • the optical pickup device 1 of the present invention includes a current DVD that applies light having a wavelength of 650 nm (hereinafter referred to as current DVD) and a so-called next-generation DVD that applies light having a wavelength of 405 nm (hereinafter referred to as next-generation DVD).
  • current DVD that applies light having a wavelength of 650 nm
  • next-generation DVD that applies light having a wavelength of 405 nm
  • the optical pickup device 1 allows the laser light (light) emitted from the light source 2 to pass through a single lens optical element such as a collimator lens 3 and an objective lens (plastic optical element) 10 having a fine structure described later. Then, the light is collected on the information recording surface 6 of the optical information recording medium 5 on the optical axis 4 to form a condensing spot, and the reflected light from the information recording surface 6 is taken in by the deflecting beam splitter 7, and the detector 8 A beam spot is formed again on the light receiving surface.
  • a single lens optical element such as a collimator lens 3 and an objective lens (plastic optical element) 10 having a fine structure described later. Then, the light is collected on the information recording surface 6 of the optical information recording medium 5 on the optical axis 4 to form a condensing spot, and the reflected light from the information recording surface 6 is taken in by the deflecting beam splitter 7, and the detector 8 A beam spot is formed again on the light receiving surface.
  • the light source 2 includes a laser diode, and is configured to be able to select and emit light of two types of wavelengths of 650 nm and 405 nm by a known switching method.
  • the collimator lens 3, the objective lens (plastic optical element) 10, and the deflection beam splitter 7 constitute an optical element unit.
  • the objective lens 10 according to the present invention is an optical element having a fine structure, and is produced by molding a resin composition by injection molding. As shown in FIG. 2, the objective lens 10 is a single-sided optical element with aspherical surfaces on both sides (on the light source side) on the optical surface 11 with respect to predetermined light passing through the optical surface 11. It has an optical path difference providing structure 20 (fine structure) that gives a predetermined optical path difference.
  • the optical path difference providing structure 20 includes three annular lens surfaces with the optical surface 11 centered on the optical axis 4 (hereinafter, the first annular lens surface 21, the second annular lens surface 22, Of the three annular lens surfaces 2;! To 23, the adjacent annular lens surfaces 2;! To 23 have different refractive powers.
  • the first annular lens surface 21 and the third annular lens surface 23 are on the same optical surface 11, and
  • the two-band lens surface 22 is a surface translated from the optical surface 11! /.
  • the first annular lens surface 21 transmits light having both wavelengths of 650 nm and 405 nm
  • the second annular lens surface 22 transmits light having a wavelength of 650 nm corresponding to the current DVD, and the third annular shape.
  • the lens surface 23 allows light of 405 nm wavelength corresponding to the next generation DVD to pass through. The light that has passed through each of the annular lens surfaces 2;! To 23 is condensed at the same position on the information recording surface 6.
  • the first annular lens surface 21 and the third annular lens surface 23 have a force S provided on the same optical surface 11, and the first and third annular lens surfaces 21. , 23 do not have to be provided on the same optical surface, and the second annular lens surface 22 does not have to be a force that is a surface translated from the optical surface 11, in particular, a parallel translated surface.
  • the number of the three annular lens surfaces 2;! To 23 may be five as long as it is at least three.
  • the objective lens 10 Due to the action of the optical path difference providing structure 20 formed in this way, the objective lens 10 has the information recording surface of the light emitted from the light source 2 with respect to a plurality of types of optical information recording media 5 such as the current DVD and the next generation DVD. Condensing light to 6 and light light reflected by the information recording surface 6 toward the detector 8 can be performed with high reliability. Further, since the resin composition forming the objective lens 10 has a high light transmittance of 85% or more, the above-described light collection can be performed with high efficiency. Therefore, since the power consumption of the light source 2 can be reduced, the power consumption of the entire optical pickup device 1 can be reduced.
  • the objective lens 10 according to the present invention is not limited to the one having the optical path difference providing structure 20 described above.
  • the objective lenses 10a to 10e having optical path difference providing structures 20a to 20d shown in FIGS. also good.
  • the optical path difference providing structure 20a in Fig. 3 includes a plurality of diffraction ring zones 21a with the optical axis 4 as the center, and the plurality of diffraction ring zones 21a have a sawtooth cross section, and each diffraction ring zone 21a
  • the optical surface 1 la is a discontinuous surface.
  • the plurality of diffraction ring zones 21a are formed so as to increase in thickness due to a force away from the optical axis 4.
  • the objective lens 10a shown in FIG. 3 is a so-called diffraction lens.
  • the optical path difference providing structure 20b in FIG. 4 has a plurality of annular recesses 21b that cause a phase difference around the optical axis 4 in a concentric manner.
  • the ring-shaped recess 21b is a light beam on the optical surface l ib. Five are formed on one surface centered on axis 4 (upper and lower optical surfaces centered on optical axis 4 in FIG. 4). Adjacent ring-shaped recesses 21b are continuously integrated with each other, and each ring-shaped recess 21b has a step-like cross section as a whole. Further, the optical surface 22b forming each ring-shaped recess 2 lb is a surface translated from the optical surface l ib.
  • the objective lens 10b shown in FIG. 4 is a so-called phase difference lens.
  • the adjacent annular zone recesses 21b are continuous and integrated, and the entire cross section is stepped.
  • the annular zone recess 21b is simply formed on the optical surface l ib. May be provided individually (in this case, for example, the structure is similar to that of the objective lens 10 shown in FIG. 2).
  • the force that the annular zone-shaped concave portion 21b has a concentric shape as shown in FIG. 5, the objective lens 10c having the annular zone-shaped convex portion 23b on the third annular zone-shaped lens surface 23 of FIG. (In FIG. 5, components similar to those in FIG. 2 are given the same reference numerals).
  • the optical path difference providing structure 20d in FIG. 6 includes a plurality of diffraction ring zones 21d with the optical axis 4 as the center, and the plurality of diffraction ring zones 21d have a sawtooth cross section and each diffraction ring zone 21d.
  • the optical surface l id is a discontinuous surface.
  • the cross section of each diffraction zone 21d is a three-step 22d step shape along the optical axis direction, and the optical surface 12d of each step 22d is a discontinuous surface that is perpendicular to the optical axis 4. ing.
  • the lens 10d shown in FIG. 6 includes, for example, a hologram optical element (HOE) 10e having an optical path difference providing structure 20d similar to FIG. 6 and an objective lens 1 Of as shown in FIG. It may be configured.
  • the hologram optical element 10e uses a plate-like optical element, and the optical path difference providing structure 20d is provided on the surface of the objective lens 10f of the optical element.
  • the optical pickup device 1 may reproduce and record information on three types of optical information recording media 5 such as a CD, a current DVD, and a next-generation DVD.
  • the combination of the optical information recording medium 5 in which information is reproduced and recorded by the optical pickup device 1 is a design matter and is set as appropriate.
  • RX 300 which is hydrophobized silica manufactured by Nippon Aerosil Co., Ltd., was used as the inorganic fine particles C. According to TEM observation, this powder had an average particle size of about 35 nm and a refractive index (nd) of 1.46.
  • each polymer was dried at 80 ° C. for 8 hours, and each inorganic fine particle was dried at 200 ° C. for 4 hours.
  • Table 1 After mixing each raw material, a plastic optical element material in which inorganic fine particles were dispersed was obtained by melt kneading.
  • the kneading conditions were kneading for 5 minutes after completion of the addition of inorganic fine particles at a set temperature of 220 ° C. and 3 Orpm using a kneader manufactured by HAAKE.
  • the plate-shaped plastic optical element was obtained by heating and pressing at 220 ° C. for 20 minutes.
  • Table 1 details of each component other than the metal element-containing polymer and the inorganic fine particles are as follows.
  • Thermoplastic resin Panlite AD5503 (polycarbonate, manufactured by Teijin Chemicals Ltd.) Stabilizer A: Tetrakis (1, 2, 2, 6, 6, pentamethylpiperidyl) butanetetracarboxylate
  • Stabilizer B Tetrakis (methylene-3- (3,5, -di-tert-butyl-4, -hydroxyphenylpropionate) methane)
  • Stabilizer C 2, 2, -methylenebis (4,6 di-tert-butylphenyl) 2-ethylhexylenophosphite
  • each optical element made of plastic showed a high light transmittance of 86% or more.
  • the molded product formed using the resin composition of the present invention does not cause coloring or clouding even when continuously irradiated with light having a short wavelength for a long time, and further deforms. High shape stability could be maintained.
  • An optical element (objective lens) having the same composition as that of the plastic optical element described in Examples 1 to 6 and having the structure illustrated in FIGS. 2 to 7 is manufactured by injection molding.
  • An optical pickup device was produced.
  • recording and reproduction on DVD were performed using light of a wavelength of 405 nm by a laser diode.
  • Optical elements were produced by the same method as in Example 7 with the same composition as the plastic optical elements described in Comparative Examples 1 to 4, and recording and reproduction on DVDs were performed in the same manner.
  • the optical pickup device using the optical element of Example 7 showed good pickup characteristics with no deformation or the like even after continuous irradiation for a long time.
  • the optical element of Comparative Example 5 When the optical element was used, the more the optical surface structure was made finer (complex), the more the deformation occurred, and the pickup characteristics were reduced.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un élément optique en plastique (également simplement désigné par 'élément optique'), qui présente une photostabilité améliorée ainsi qu'une excellente transparence et peut montrer ces propriétés pendant une longue période. La présente invention concerne également un appareil phonocapteur optique qui présente de bonnes propriétés phonocaptrices et qui est produit en utilisant l'élément optique. L'élément optique en plastique comprend une composition en résine comprenant au moins un polymère organique vinylique contenant un élément métallique et une microparticule inorganique.
PCT/JP2007/065158 2006-09-15 2007-08-02 Matériau d'élément optique en plastique, et élément optique en plastique et appareil phonocapteur optique utilisant celui-ci WO2008032501A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005003772A (ja) * 2003-06-10 2005-01-06 Olympus Corp 光学材料用組成物および光学素子
JP2005146042A (ja) * 2003-11-12 2005-06-09 Olympus Corp 有機無機複合材料及びその製造方法並びに光学素子
JP2006076026A (ja) * 2004-09-07 2006-03-23 Sanyo Electric Co Ltd 複合レンズ、複合レンズの製造方法、及びレンズモジュール
WO2006059652A1 (fr) * 2004-12-01 2006-06-08 Sanyo Electric Co., Ltd. Materiau polymere organique a metal
JP2006213895A (ja) * 2005-02-07 2006-08-17 Konica Minolta Opto Inc 無機有機複合熱可塑性材料及び光学素子
JP2007191687A (ja) * 2005-12-22 2007-08-02 Sanyo Electric Co Ltd 有機無機複合体形成用材料、有機無機複合体、その製造方法及び光学素子

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005003772A (ja) * 2003-06-10 2005-01-06 Olympus Corp 光学材料用組成物および光学素子
JP2005146042A (ja) * 2003-11-12 2005-06-09 Olympus Corp 有機無機複合材料及びその製造方法並びに光学素子
JP2006076026A (ja) * 2004-09-07 2006-03-23 Sanyo Electric Co Ltd 複合レンズ、複合レンズの製造方法、及びレンズモジュール
WO2006059652A1 (fr) * 2004-12-01 2006-06-08 Sanyo Electric Co., Ltd. Materiau polymere organique a metal
JP2006213895A (ja) * 2005-02-07 2006-08-17 Konica Minolta Opto Inc 無機有機複合熱可塑性材料及び光学素子
JP2007191687A (ja) * 2005-12-22 2007-08-02 Sanyo Electric Co Ltd 有機無機複合体形成用材料、有機無機複合体、その製造方法及び光学素子

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