JP2001183501A - Optical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide optical parts made of an organic polymer having excellent transparency and a high refractive index. SOLUTION: An organic polymer is used as the material for optical parts. Fine particles are uniformly dispersed in a transparent base polymer as the basic material of the organic polymer to obtain a material satisfying the conditions of nd>=-4.80×10-3A+1.81 and A>=40, wherein nd is the refractive index for light at 587 nm wavelength and A is the Abbe number, and >=80% transmittance for light at 587 nm wavelength. As for the base polymer, a methacrylic resin is used, and as for the fine particles, alumina is preferably used to obtain a high refractive index.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic polymer in which fine particles are dispersed, a lens having the same, and a film unit with a lens.

[0002]

2. Description of the Related Art Transparent plastic is known as an alternative to glass. Transparent plastics have been used in recent years because they have excellent impact resistance, mechanical strength, and transparency, and are lightweight and excellent in workability. Transparent plastic materials include thermoplastic polyvinyl chloride, polystyrene, polycarbonate, polymethyl methacrylate, polyethylene terephthalate, polyglycol,
Organic polymers such as polyacetal, trifluoroethylene chloride, and thermosetting polydiethylene glycol are often used.

[0003]

However, when the above-mentioned transparent plastic is used as an optical lens, the refractive index is not sufficiently high, so that it is strongly affected by the curvature of field or the chromatic aberration is remarkably deteriorated. There was a problem of doing.

In the case of a transparent resin such as polymethyl methacrylate, a refractive index of only 1.492 and an Abbe number of about 58 can be obtained, and sufficient optical performance cannot be obtained. Also, A
rton (trade name: refractive index 1.51, Abbe number 57) and ZEONEX (trade name: refractive index 1.53, Abbe number 5)
6) refractive index like alicyclic polyolefin resin,
Synthetic resins improved in terms of Abbe number are also known,
Performance was insufficient for use as an optical lens.

[0005] Japanese Patent Application Laid-Open No. 7-97499 discloses that
TiO ₂ to SiO ₂ based three-dimensional microstructure, ZrO _2, G
Although an inorganic / organic hybrid material containing a metal compound such as eO ₂ has been proposed, the Abbe number of the metal fine particles in the metal compound is low, and it is not yet practical as a molding material for an optical lens. For example, TiO ₂ has an Abbe number of 9.
When only TiO ₂ is added to polymethyl methacrylate having an excellent Abbe number (abbe number 58) alone, the refractive index increases but the Abbe number decreases. Therefore, when used as an optical lens, there are problems such as the occurrence of chromatic aberration,
The performance was insufficient for use as an optical lens.

[0006] On the other hand, many glass materials are known which are more excellent in transparency, refractive index and Abbe number than transparent plastics. However, glass has disadvantages such as high cost, not suitable for mass production, low safety when broken, and heavy weight. Therefore, for example, when it is adopted as a lens material for a film unit with a lens, which is a single-use type simple camera pre-loaded with a photo film, mass productivity, impact resistance, and light weight are strongly required for the lens material. Therefore, it is very difficult to adopt the method and it is not preferable in terms of cost.

Further, Japanese Patent No. 2535303 proposes an ultrafine particle-dispersed glass material in which ultrafine particles of a metal oxide are dispersed in glass. Since ultrafine particles are dispersed in glass, it is very difficult to adopt it as a lens material for the same reason as glass as described above.

The present invention has been made in consideration of the above problems, and has as its object to provide an organic polymer optical component which is inexpensive, has high safety, is lightweight, and has excellent optical characteristics. .

[0009]

In order to achieve the above object, an optical component according to the present invention is made of an organic polymer. When the refractive index for light having a wavelength of 587 nm is n _d and the Abbe number is A, n _d ≧ −4.80 × 10 ⁻³ A + 1.81 (A ≧ 40) (1) or A ≧ 60 (2) and the light transmittance at a wavelength of 587 nm is 8
0% or more. In addition, the organic polymer, a transparent base polymer as a base material, fine particles having a higher refractive index than at least one kind of base polymer uniformly dispersed in the base polymer, and uniformly dispersed in the base polymer It is preferable to use fine particles having at least one kind of refractive index distribution exhibiting anomalous dispersibility in the visible region, for example, a mixture of titanium oxide and anomalous dispersion particles. Further, as the organic polymer,
A transparent base polymer serving as a base material, fine particles having a higher refractive index and a higher Abbe number than at least one base polymer uniformly dispersed in the base polymer, and at least uniformly dispersed in the base polymer. Fine particles having one type of refractive index distribution exhibiting anomalous dispersion in the visible region may be used. For example, a mixture of yttrium oxide and anomalous dispersion particles may be used. Furthermore, the organic polymer is composed of a transparent base polymer as a base material and at least one kind of fine particles having a high refractive index and a high Abbe number uniformly dispersed in the base polymer. You may.
The volume fraction of the fine particles in the organic polymer is preferably 15% to 80%, and more preferably 20% to 8%.
It is good to make it 0%. As a specific example of the base polymer, a methacrylic resin is effective.

A specific example of the optical component is a lens. When the present invention is used as a lens, the base polymer should account for at least 50% by weight, preferably at least 80% by weight. Such a lens,
It is suitable to be used for a photographic lens or a finder lens of a film unit with a lens, which is pre-loaded with a film at the time of manufacture and collected by the manufacturer after use, while keeping the manufacturing cost of the film unit with a lens low. Good imaging performance can be obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION "Sufficient transparency" as used in the present invention means that the transmittance of light having a wavelength of 587 nm is 80% or more. Of course, the transmittance is preferably as close as possible to 100%, but if it is 85% or more, it can be practically used without any problem. Although the transmittance depends on the thickness of the polymer, in the present invention, in measuring the transmittance, a liquid mixture of an organic polymer containing fine particles is applied to a thickness of 0.1 mm on a transparent support using a wire bar or the like. The ratio of the amount of transmitted light to the amount of incident light with respect to the formed product after drying or crosslinking is defined as the transmittance.

Here, as disclosed in Japanese Patent Application Laid-Open No. 1-50258, in a method of forming a thin film on a substrate by sputtering a metal oxide, powders are strongly aggregated to generate scattered light. Since sufficient transparency cannot be obtained, it is impossible to obtain an organic polymer satisfying the transparency as shown in the present invention.

The organic polymer in the present invention is obtained by uniformly dispersing fine particles in a base polymer as a main raw material. In this case, the average dispersed particle size of the fine particles is 1 to 100 nm.
Is preferably, more preferably 1 to 50 nm,
1-10 nm is most preferred. 100n average dispersed particle size
If it is larger than m, scattering of visible light due to Rayleigh scattering increases, the organic polymer becomes milky white, and transparency is significantly reduced. On the other hand, if the dispersed particles are 1 nm or less, it is difficult to maintain the crystallinity of the particles, and a high refractive index cannot be maintained.
By adjusting the average dispersed particle diameter in this way, even if fine particles are contained, the light transmittance can be maintained without lowering.

The base polymer is one or two selected from thermosetting, self-curing, solvent evaporation-curing, ultraviolet-curing, and electron beam-curing acrylic, epoxy, silicone, urethane, and fluororesins. Mix and use more than one kind of material. In addition, it is preferable to use a methacrylic resin. This methacrylic resin is composed of a homopolymer of methyl methacrylate or a polymer obtained by polymerizing a mixture of methyl methacrylate and a monomer having another copolymerizable vinyl group. As copolymerizable monomers, acrylic esters such as methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, penzyl acrylate, and 2-2-2-trifluoroethyl acrylate Methacrylates such as ethyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, 2-2-2-trifluoroethyl m methacrylate, acrylonitrile, styrene, vinyl compounds such as α-methylstyrene, maleic anhydride, itaconic anhydride, etc. Acid anhydride,
Maleimide compounds such as cyclohexylmaleimide and phenylmaleimide. Further, among methacrylic resins, it is preferable to use a methyl methacrylate homopolymer.

The method for producing the methacrylic resin is not particularly limited, and it can be produced by a known polymerization method such as suspension polymerization, bulk polymerization, and solution polymerization. If necessary, additives such as a release agent, an ultraviolet absorber, a heat stabilizer, and a coloring agent may be mixed and used.

The mixing of the fine particles and the base polymer is as follows:
The microparticles are mixed with water, an organic solvent, or a suspension in which the two are dispersed, or a suspension prepared using a sol-gel method and the base polymer, or the base polymer dissolved in the solvent from the beginning. It is preferable to carry out the process by dispersing fine particles.

In order to make the average dispersed particle size of the dried fine particles 1 to 100 nm, the average dispersed particle size in the dispersion must be 1 to 100 nm. The dispersed particle diameter in the dispersion is maintained as it is even after the molding and drying steps, and becomes the average dispersed particle diameter of the dried fine particles, and the transmittance of the dried base polymer is maintained at a high value.

(Definition of Refractive Index) The definition of the refractive index shown in the present invention is obtained by molding a material into a smooth film by spin coating or the like, and measuring it by an ellipsometer (a variable angle ellipsometer manufactured by JA Woollam). Wavelength 587
It is the value of the refractive index in nm. The refractive index of the organic polymer of the present invention is not limited, but the refractive index is preferably 1.49 or more, more preferably 1.55 or more, and most preferably 1.60 or more.

(Definition of Abbe Number) The Abbe number shown in the present invention is (A) represented by the following equation. That is, wavelength 5
Assuming that the refractive index at 87 nm is n _D , the refractive index at 486 nm is n _F , and the refractive index at 660 nm is n _C , A
= A numerical value represented by _{2 (n D -1) / (} n C -n F). Although the Abbe number of the organic polymer shown in the present invention is not limited, the Abbe number is preferably 43 or more, more preferably 55 or more, and most preferably 60 or more.

(Definition of anomalous dispersibility) The case of having anomalous dispersibility shown in the present invention is a case where the Abbe number becomes negative. Anomalous dispersion is a phenomenon in the visible part where the value of the refractive index increases as the wavelength increases. As a substance exhibiting anomalous dispersion, an infrared absorbing dye which is a substance having an intrinsic absorption in an infrared region can be given. On the other hand, a phenomenon in which the value of the refractive index decreases as the wavelength increases in the visible region is called normal dispersion. Examples of a substance exhibiting normal dispersion include a substance having no intrinsic absorption and a substance having an intrinsic absorption in an ultraviolet region.

As the fine particles for obtaining a high refractive index by dispersing in the base polymer, inorganic fine particles can be used. As the inorganic fine particles, metals such as aluminum, titanium, zirconium, antimony, yttrium,
It is preferable to use zinc, tin, magnesium and the like. The fine particles are used as a powder or a colloidal dispersion. Water or an organic solvent is used as a dispersion medium for dispersing the fine particles. The inorganic fine particles are used by being dispersed in an organic compound (including an organic substituted silicon compound).

Further, an organometallic compound which can be molded as fine particles may be used. The organometallic compound can be dispersed in a solvent that is a dispersion medium, or can be molded if the organometallic compound is in a liquid state. In addition, alkoxides, salts of organic acids, and coordination compounds are used as the formable organometallic compounds.

Examples of the organometallic compounds which can be molded include metal alcoholates (titanium tetraethoxide, titanium etra-i-propoxide, titanium tetra-n-propoxide, titanium tetra-n-butoxide, titanium tetra-s
ec-butoxide, titanium tetra-tert-butoxide, aluminum triethoxide, aluminum tri-oxide
iso-propoxide, aluminum tryptoxide,
Antimony triethoxide, antimony tryptoxide, zirconium tetraethoxide, zirconium tetra-i-propoxide, zirconium tetra-n-propoxide, zirconium tetra-sec-butoxide,
Zirconium tetra-sec-butoxide, zirconium tetra-tert-butoxide, etc., chelating compounds (di-isopropoxytitanium bisacetylacetonate, di-butoxytitanium bisacetylacetonate, di-ethoxytitanium bisacetylacetonate, bisacetylacetone) Zirconium, aluminum acetylacetonate, aluminum di-n-butoxide monoethyl acetoacetate, aluminum di-is
o-butoxide monoethyl acetoacetate, tri-n
-Butoxide zirconium monoethyl acetoacetate), and ammonium zirconyl carbonate.

Further, in addition to the organometallic compound, an active inorganic polymer containing zirconium as a main component may be used as the fine particles. Further, a compound having a relatively low refractive index may be used in combination with the above-mentioned metal alcoholate, chelate compound and zirconyl ammonium carbonate. Compounds that can be used in combination include alkyl silicates, hydrolysates thereof, and particulate silica gel. It is preferable that the particulate silica gel is dispersed in a colloidal state.

However, as described above, simply dispersing the fine particles in the base polymer often does not provide a high Abbe number, so that the performance is insufficient for use as an optical lens. Therefore, it is effective to disperse the anomalous dispersion material to improve the Abbe number. However, like the alumina shown in the present invention, the refractive index is high (the refractive index is 1.7).
4) When fine particles having an Abbe number (Abbe number 54) are used, the anomalous dispersion material may not be dispersed together. As the anomalous dispersion material, an infrared absorbing dye is preferably used, and among infrared absorbing dyes, those having a small visible part absorption are particularly preferable.

The infrared absorbing dye includes an organic compound and an inorganic compound, and it is preferable to use an infrared absorbing dye which is an organic compound. The infrared absorbing dye includes a cyanine compound, a metal chelate compound, an aluminum compound, a diimonium compound, a quinone compound, a squarium compound, and a methine compound. As for the infrared absorbing dye, coloring materials, 61 (4) 215-22
6 (1998), and Kagaku Kogyo, 43-53 (198
June and May).

As the infrared absorbing dye to be used, an infrared absorbing dye developed in the technical field of silver halide photosensitive materials is preferable. Examples of the infrared absorbing dye include dihydroperimidine squarylium dye (described in U.S. Pat. No. 5,380,635 and Japanese Patent Application No. 8-189817) and cyanine dyes (Japanese Unexamined Patent Publication Nos. 62-123454 and 3-13).
No. 8640, No. 3-221542, No. 3-22673
6, JP-A-5-313305 and JP-A-6-46583, Japanese Patent Application No. Hei 7-269097, and European Patent No. 0
JP-A-430244), pyrylium dyes (JP-A-3-138640, JP-A-3-212542, JP-A-3-226736, JP-A-5-313305, JP-A-6-43583, and JP-A-6-43583). 7-26909
7 and EP 0430244).
Diimonium dyes (described in JP-A-3-138640 and JP-A-3-212542), pyrazolopyridone dyes (described in JP-A-2-28244), indonialine dyes (JP-A-5-323500, JP-A-5-213500) 3235
No. 01), polymethylene dyes (JP-A-3-26)
No. 765, JP-A-4-190343 and European Patent No. 377,961), oxonol dyes (described in JP-A-3-9346), anthraquinone dyes (described in JP-A-4-13654). And naphtholactam dyes (described in EP 568267).

Two or more infrared absorbing dyes may be used in combination. The infrared absorbing dye is dissolved in an appropriate solvent (water, alcohol, methyl cellosolve, DMF, dichloromethane, acetone, ethyl acetate), It can be added to a solution for forming an organic polymer having a high refractive index and a high Abbe number according to the invention. However, it is preferable to add the solid fine particle dispersion of the infrared absorbing dye to the organic polymer forming liquid having a high refractive index and a high Abbe number shown in the present invention. For a solid fine particle dispersion of an infrared absorbing dye, see JP-A-2-282244.
And Japanese Patent Application Laid-Open No. 3-138640 and Japanese Patent Application No. Hei 7-138640.
No. 269097.

In order to obtain a solid fine particle dispersion of the infrared absorbing dye, a known disperser can be used. As a disperser, for example, a ball mill, a vibration ball mill, a planetary ball mill, a sand mill, a colloid mill, a jet mill,
Includes roller mill. For the disperser, see
2-92716 and International Patent Publication No. 88/0747.
No. 94 is described. In addition, it is preferable to use a vertical or horizontal medium dispersion machine.

For dispersion, use a suitable medium (water, alcohol, etc.)
May be carried out in the presence of In addition, as this medium,
It is preferred to use a dispersing surfactant. As the surfactant for dispersion, an anionic polymer, a nonionic surfactant, or a cationic surfactant may be used. Further, a hydrophilic polymer (cellulose-based polymer) may be added to the medium at the time of dispersion. After dissolving the infrared absorbing dye in a suitable solvent, the solvent may be added to obtain a fine powder. Also in this case, a surfactant for dispersion may be used. Alternatively, the infrared absorbing dye may be dissolved by adjusting the pH, and then the pH may be changed to obtain microcrystals of the dye.

The organic polymer thus obtained is
Since the fine particles are uniformly dispersed, the transparency is high, and a high refractive index and a high Abbe number are formed. Therefore, it is possible to satisfy the conditions of the above-mentioned expressions (1) and (2), which is very suitable for lens use. For example, Japanese Patent Application Laid-Open No.
No. 97499, SiO ₂ based 3
A metal compound such as TiO ₂ , ZrO ₂ , GeO ₂ dispersed in a three-dimensional microstructure; and French Patent No. 268
As disclosed in Japanese Patent No. 2389, there is a dispersion in which fine particles such as metal alkoxides of titanium and zirconium are dispersed in a base polymer. However, these proposals do not provide a sufficient Abbe number, and (1), Condition (2) cannot be satisfied, which is different from the purpose of the present invention.

When an organic polymer is used as a lens, the base polymer preferably accounts for 50% by weight or more of the lens, more preferably 80% by weight or more of the lens. JP-A-8-48940 proposes a synthetic lens in which a high-refractive-index coating is formed on the surface of a synthetic resin. The high refractive index coating contains oxide fine particles, and the oxide fine particles are composed of oxides of titanium, silicon, and aluminum. However, the lens of the present invention is intended to disperse the fine particles uniformly throughout the organic polymer so that the lens itself satisfies the transparency and has an optical performance excellent in refractive index and Abbe number. The proposal disclosed in JP-A-8-48940 is different from the gist of the present invention.

When processing as a lens, an upper mold and a lower mold having a curvature in accordance with a predetermined prescription may be used to directly form a lens shape. After the formation, it is possible to obtain a lens having a desired shape as a final product by performing rough cutting or polishing using a lens polishing apparatus.

After forming the lens, a polysiloxane organic hard coat agent film, a coloring process, an antireflection film,
It is also possible to perform a surface treatment such as a fluorine-based drainage prevention film formation.

[0035]

EXAMPLES "First Example" A base polymer was prepared as follows. 2-hydroxyethyl methacrylate 1
13 parts, 87 parts of methyl methacrylate, and 0.28 part of azobisisobutyronitrile as a polymerization initiator
It was added to 0 parts of toluene and mixed and stirred to obtain a uniform solution. Next, nitrogen bubbling was performed at room temperature for 1 hour, and then polymerization was performed by stirring at 60 to 70 ° C. for 8 hours while performing nitrogen bubbling. After completion of the polymerization, the polymer was reprecipitated and then dried to obtain 182 parts of a hydroxyl group-containing methacrylate polymer. The obtained polymer was soluble in a solvent of methanol / acetone (1/1).

Next, the preparation of the fine particle dispersion was performed as follows. 15% by weight of alumina ME
To 70 parts of the K dispersion (primary particle size: 10 nm), 100 parts of a 10% by weight solution of a methanol / acetone (1/1) solvent in which the hydroxyl group-containing methacrylate polymer was dissolved was added, followed by mixing and stirring to obtain a mixed solution. .

The mixture was placed in a beaker made of polypropylene, coated on a transparent support with a wire bar to a thickness of 0.1 mm, and left at room temperature for 3 weeks for polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. The transmittance of this organic polymer at 587 nm was measured by a spectrophotometer (U-3200, manufactured by Hitachi, Ltd.). As a result, the transmittance was 85%.

The mixture was spin-coated on a transparent support to a thickness of 0.1 μm and left at room temperature for 3 weeks for polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. As a result of measuring the refractive index of this organic polymer with an ellipsometer (deformation ellipsometer manufactured by JA Woollam), the Abbe number was 61, and as shown in FIG. 1, the refractive index for light having a wavelength of 587 nm was 1.55. Was. The hatched portion in FIG. 5 is (1),
Although the range satisfying the expression (2) is shown, the physical properties satisfy the conditions of the expressions (1) and (2), and the optical performance used for the lens is excellent.

"Comparative Example 1" A base polymer was prepared in the same manner as in "First Example", and the resulting mixed solution was not mixed with the fine particle dispersion, and was placed on a transparent support with a wire bar. The composition was applied to a thickness of 0.1 mm and left at room temperature for 3 weeks to perform polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. The wavelength 58 of this organic polymer
The transmittance of 7nm light is measured by a spectrophotometer (Hitachi U-
3200), the transmittance was 87%.

Further, the mixture was spin-coated on a transparent support to a thickness of 0.1 μm and left at room temperature for 3 weeks for polymerization and drying. Thus, a dried and solidified organic polymer was obtained. The refractive index of this organic polymer was measured using an ellipsometer (JA Woollam).
As a result of measurement using a variable angle ellipsometer (manufactured by Sharp Corporation), the Abbe number was 58, and as shown in FIG. As shown in FIG. 5, the physical properties do not satisfy the conditions of the expressions (1) and (2), and the optical performance used for the lens is insufficient.

"Second Embodiment" A base polymer was prepared in the same manner as in the "First Embodiment", and 1% of yttrium oxide was prepared.
40 parts by weight of a 5% by weight MEK dispersion (primary particle size: 10 nm) was used as a fine particle dispersion. Then, a 10% by weight solution of a methanol / acetone (1/1) solvent in which the hydroxyl group-containing methacrylate polymer was dissolved was added to the fine particle dispersion.
00 parts were added and mixed and stirred to obtain a mixed solution.

The obtained mixture was applied on a transparent support with a wire bar to a thickness of 0.1 mm, and left standing at room temperature for 3 weeks to carry out polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. The transmittance of this organic polymer at 587 nm was measured by a spectrophotometer (U-3200, manufactured by Hitachi, Ltd.). As a result, the transmittance was 85%.

The mixture was spin-coated on a transparent support to a thickness of 0.1 μm and left at room temperature for 3 weeks for polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. As a result of measuring the refractive index of this organic polymer by an ellipsometer (deformation ellipsometer manufactured by JA Woollam), the Abbe number was 44, and as shown in FIG. 3, the refractive index for light having a wavelength of 587 nm was 1.60. Was. This physical property value satisfies the conditions of the expressions (1) and (2) as shown in FIG. 5, and is excellent in optical performance used for a lens.

(Comparative Example 2) A base polymer was prepared in the same manner as in the above-mentioned "First Example", and 15% by weight of titanium oxide was prepared.
14 parts by weight of the MEK dispersion (primary particle size: 10 nm) was used as a fine particle dispersion. 100 parts of a 10% by weight solution of a methanol / acetone (1/1) solvent in which the hydroxyl group-containing methacrylate polymer was dissolved was added to the fine particle dispersion, followed by mixing and stirring to obtain a mixed solution.

The obtained mixture was applied to a transparent support with a wire bar to a thickness of 0.1 mm, and left standing at room temperature for 3 weeks to carry out polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. The transmittance of the organic polymer at a wavelength of 587 nm is measured using a spectrophotometer (Hitachi, Ltd.)
U-3200), the transmittance was 80%.

The mixture was spin-coated on a transparent support to a thickness of 0.1 μm and left at room temperature for 3 weeks to carry out polymerization and drying. Thereby, a dried and solidified organic polymer was obtained. As a result of measuring the refractive index of this organic polymer with an ellipsometer (deformation ellipsometer manufactured by JA Woollam), the Abbe number was 27, and as shown in FIG. 4, the refractive index for light having a wavelength of 587 nm was 1.60. Was. As shown in FIG. 5, these physical property values do not satisfy the conditions of the expressions (1) and (2), and the optical performance used for the lens is insufficient.

[0047]

As described above, the optical component of the present invention is
The refractive index for light having a length of 587 nm is n _d, The Abbe number is A
And n_d≧ −4.80 × 10^-3A + 1.81 (A ≧ 40) (1) or A ≧ 60 (2)
High optical performance while maintaining reasonable transparency.
Wear. In particular, compared to conventional plastic optical components
When used as a lens because of its high refractive index
Must have a large spherical or aspherical curvature.
And molding becomes easy.

[Brief description of the drawings]

FIG. 1 shows the refractive index of an organic polymer mixed with alumina as a dispersion of fine particles.

FIG. 2 shows a refractive index of an organic polymer to which a dispersion of fine particles is not mixed.

FIG. 3 shows ME of yttrium oxide as a dispersion of fine particles.
It shows the refractive index of the organic polymer mixed with the K dispersion.

FIG. 4 shows the refractive index of an organic polymer mixed with a dispersion of titanium oxide MEK as a dispersion of fine particles.

FIG. 5 is an explanatory diagram showing a relationship between a refractive index and an Abbe number.

Claims (11)

[Claims] 1. An organic polymer, having a wavelength of 587 nm
Assuming that the refractive index with respect to the light is n _d and the Abbe number is A, the condition of n _d ≧ −4.80 × 10 ⁻³ A + 1.81 (A ≧ 40) or A ≧ 60 is satisfied, and light transmission at a wavelength of 587 nm is satisfied. Rate 8
An optical component characterized by being at least 0%. 2. A transparent base polymer in which the organic polymer is a base material, fine particles having a higher refractive index than at least one kind of base polymer uniformly dispersed in the base polymer, and the base polymer 2. The optical component according to claim 1, wherein at least one kind of refractive index distribution uniformly dispersed in the optical component is composed of fine particles exhibiting anomalous dispersion in the visible region. 3. The organic polymer, wherein the base polymer is a transparent base polymer, and fine particles having a higher refractive index and a higher Abbe number than at least one type of base polymer uniformly dispersed in the base polymer; 2. The optical component according to claim 1, wherein at least one kind of refractive index distribution uniformly dispersed in the base polymer is composed of fine particles exhibiting anomalous dispersibility in the visible region. 4. The organic polymer comprises a transparent base polymer as a basic material and at least one kind of fine particles having a high refractive index and a high Abbe number uniformly dispersed in the base polymer. The optical component according to claim 1, wherein: 5. The optical component according to claim 1, wherein the fine particles have a volume fraction of 15% to 80% in the organic polymer. 6. The optical component according to claim 1, wherein the fine particles have a volume fraction of 20% to 80% in the organic polymer. 7. The optical component according to claim 2, wherein the fine particles include at least alumina. 8. The optical component according to claim 2, wherein the base polymer is a methacrylic resin. 9. The optical component according to claim 1, wherein the optical component is a lens. 10. The optical component according to claim 9, wherein the base polymer accounts for 50% by weight or more. 11. The optical component according to claim 9, wherein the base polymer accounts for 80% by weight or more.