WO2016031249A1 - 光学材料用樹脂前駆体組成物、この組成物から得られる光学要素およびこの光学要素を用いて構成される回折光学素子 - Google Patents
光学材料用樹脂前駆体組成物、この組成物から得られる光学要素およびこの光学要素を用いて構成される回折光学素子 Download PDFInfo
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- 0 CC(C)(c1ccc(C(C(F)(F)F)(C(F)(F)F)c(cc2)ccc2OCC*OC(C(*)=C)=O)cc1)OCCC(C)(N)OC(C(*)=C)=O Chemical compound CC(C)(c1ccc(C(C(F)(F)F)(C(F)(F)F)c(cc2)ccc2OCC*OC(C(*)=C)=O)cc1)OCCC(C)(N)OC(C(*)=C)=O 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/12—Esters of phenols or saturated alcohols
- C08F222/18—Esters containing halogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/003—Esters of saturated alcohols having the esterified hydroxy group bound to an acyclic carbon atom
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/52—Esters of acyclic unsaturated carboxylic acids having the esterified carboxyl group bound to an acyclic carbon atom
- C07C69/533—Monocarboxylic acid esters having only one carbon-to-carbon double bond
- C07C69/54—Acrylic acid esters; Methacrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F122/00—Homopolymers 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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
- C08F122/10—Esters
- C08F122/1006—Esters of polyhydric alcohols or polyhydric phenols, e.g. ethylene glycol dimethacrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G75/00—Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen, or carbon in the main chain of the macromolecule
- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
- C08G75/045—Polythioethers from mercapto compounds or metallic derivatives thereof from mercapto compounds and unsaturated compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- C08L33/16—Homopolymers or copolymers of esters containing halogen atoms
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1847—Manufacturing methods
- G02B5/1852—Manufacturing methods using mechanical means, e.g. ruling with diamond tool, moulding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1866—Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F122/00—Homopolymers 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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides or nitriles thereof
- C08F122/10—Esters
- C08F122/12—Esters of phenols or saturated alcohols
- C08F122/18—Esters containing halogen
Definitions
- the present invention has a characteristic of low refractive index and high dispersion, a resin precursor composition suitable for use in a multilayer diffractive optical element, an optical element using this resin precursor composition,
- the present invention relates to an optical element (specifically, a diffractive optical element) obtained by a combination of an optical material and a resin having a characteristic of high refractive index and low dispersion.
- a diffractive optical element in which the height of a grating is processed to one wavelength, that is, a phase difference equivalent to 2 ⁇ , concentrates light on the first-order diffracted light. Therefore, there have been considered applications aimed at correcting the chromatic aberration of the optical system and reducing the size and weight.
- the first-order diffraction efficiency can be made 100% at the reference wavelength, but the diffracted light of other orders increases as the wavelength goes away from the reference wavelength, which is the flare light.
- n1 and n2 are the refractive indexes of the resin (n2> n1)
- h is the grating height of the diffractive optical element
- ⁇ is the wavelength.
- Kensaburo Suzuki “Introduction to the revised edition: Introduction to diffractive optical elements”, 163 (Opttronics, 1997)
- the refractive index difference (n2 ⁇ n1) of the resin is proportional to the wavelength.
- the first resin (refractive index n1) has a low refractive index and high dispersion resin
- the second resin (refractive index n2) has a high refractive index. It is necessary to be composed of a low dispersion resin. In other words, a combination of resins that increases the difference between the two resin dispersion values (Abbe number or average dispersion (nF-nC)) is required. Further, since the grating height h can be lowered as the refractive index difference (n2 ⁇ n1) between the two resins is larger, the processing of the grating becomes easier.
- the contact multilayer diffractive optical element has a condition that must be satisfied according to its use.
- the excitation wavelength of fluorescence usually ultraviolet light
- the change in flare caused by the diffracted light can be suppressed to an allowable level or less. It is considered important.
- the present invention obtains a resin having a lower refractive index and a higher dispersion than that of a conventional resin and a resin precursor composition thereof, and an optical element using the resin, and further uses thereof.
- an object is to obtain a contact multilayer diffractive optical element by a combination of this resin and a high refractive index and low dispersion resin.
- the resin precursor composition for optical materials is a composition containing a compound bisphenol AF ethylene oxide-modified di (meth) acrylate represented by the following chemical formula 1.
- the resin precursor is a compound that becomes a cured resin by curing, and may include any of a monomer, an oligomer, a prepolymer, and a polymer.
- the resin precursor composition according to the present invention includes the composition represented by the above chemical formula 1 and a polymerization initiator. At this time, the amount of the polymerization initiator added is preferably 0.05 to 3% by weight with respect to the optical material. This addition amount is more preferably 0.07 to 0.7% by weight with respect to the optical material.
- a diffractive optical element that solves the above-described problems includes a diffraction grating in which the optical element described above and an optical element having a higher refractive index and lower dispersion than the optical element are stacked and a diffraction grating is provided at the interface.
- the high refractive index and low dispersion optical element cures an addition reaction product of a composition containing a thiol represented by the following chemical formula 2 and di (meth) acrylate. can get.
- the di (meth) acrylate is represented by the following chemical formula 3.
- the above-described resin precursor composition according to the present invention is a material having a low refractive index and high dispersion, and is suitable for use in a diffractive optical element of a contact multilayer type.
- the optical element according to the present invention has a low refractive index and high dispersion.
- the resin is composed of a combination of a high refractive index and low dispersion resin.
- FIG. 3 is a cross-sectional view of a lens configured to include a multi-contact diffractive optical element configured using a low refractive index and high dispersion resin according to the present embodiment. It is a graph which shows the diffraction efficiency of the contact
- This resin precursor composition contains bisphenol AF ethylene oxide-modified di (meth) acrylate represented by the following chemical formula 1.
- the resin precursor represented by the above chemical formula 1 is liquid at room temperature, and an optical element cannot be formed as it is. For this reason, light or a thermal polymerization initiator is added to this resin precursor composition, and this is cured by irradiation with ultraviolet light or heat. In this way, in the process of curing by irradiation with ultraviolet light or heat, or after curing, it is molded or processed into a desired shape, thereby producing an optical element used for a lens, a diffractive optical element, or the like.
- Irgacure 184 manufactured by BASF Japan Ltd.
- BASF Japan Ltd. which is a photopolymerization initiator
- BMHF 2,2-bis (4- (2- (meth) acryloyloxy) ethoxy) phenyl-1,1,1,3,3,3-hexafluoropropane
- a precursor composition was prepared by adding 0.5 wt%.
- Example 1 BMHF, Irgacure 184 0.1 wt%
- Example 2 BAHF, Irgacure 184 0.1 wt%
- Example 3 BMHF, Irgacure 184 0.5 wt%
- a conventional optical material (referred to as conventional material a) was prepared as a comparative example.
- the conventional material a is a material according to Japanese Patent No. 4760714 owned by the present applicant, and is an optical material obtained by curing the resin precursor composition b described as Example 1 of the specification of the patent publication by ultraviolet irradiation. It is.
- This resin precursor composition a has a fluorene structure with 2,2,3,3,4,4,5,5-octafluorohexane-1,6-diacrylate 53 wt%, which is a bifunctional fluorine acrylate.
- the photopolymerization initiator Irgacure 184 was added to 42 wt% of 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene as a bifunctional acrylate and 5 wt% of 2-phenoxyethylene glycol acrylate as a monofunctional acrylate. It is prepared by adding 5 wt%.
- Any light source may be used as long as it includes 365 nm, and a metal halide lamp, a high-pressure mercury lamp, an LED, or the like can be used.
- a metal halide lamp, a high-pressure mercury lamp, an LED, or the like can be used.
- an LED is desirable. Therefore, in this embodiment, an LED is used.
- the resin having a thickness of 100 ⁇ m thus produced is irradiated with ultraviolet light for a long time.
- Light resistance was tested.
- the ultraviolet light illuminance was 350 mW / cm 2
- irradiation was performed for 216 minutes, and fluorescence measurement and transmittance measurement were performed after this irradiation.
- the transmittance was measured with U-3900H manufactured by Hitachi High-Technologies Corporation.
- the amount of fluorescence was measured with F-7000 manufactured by Hitachi High-Technologies Corporation.
- Table 1 shows the refractive indexes and dispersion values of the resins molded in Examples 1-3 and Comparative Examples.
- Table 1 It can be seen from Table 1 that BMHF and BAHF, which are bisphenol AF ethylene oxide-modified di (meth) acrylate resins, have low refractive index and high dispersion characteristics.
- the conventional material a which is a comparative example also has low refractive index and high dispersion characteristics.
- the resins of Examples 1-3 and Comparative Examples were subjected to a light resistance test by long-time ultraviolet light irradiation to measure fluorescence and transmittance. The results are shown in FIG. 1 and FIG.
- this light resistance test was performed using the ultraviolet light irradiation machine (made by Ubix Corporation) provided with LED which generate
- the ultraviolet light illuminance at this time was 350 mW / cm 2 , and irradiation was performed for 216 minutes, and fluorescence measurement and transmittance measurement were performed after this irradiation.
- the transmittance was measured with U-3900H manufactured by Hitachi High-Technologies Corporation.
- the amount of fluorescence was measured with F-7000 manufactured by Hitachi High-Technologies Corporation.
- FIG. 1 shows the fluorescence characteristics after ultraviolet irradiation of the resins of Examples 1 and 2 and the fluorescence characteristics after ultraviolet irradiation of an adhesive used for a microscope objective lens for comparison.
- the horizontal axis represents the wavelength of light
- the vertical axis represents the fluorescence intensity in arbitrary units [arb.unit]. From the figure, it can be seen that the fluorescence intensity of the resin of the present invention is very small after ultraviolet irradiation.
- FIG. 2 shows the transmittance characteristics of Examples 1 and 2 and the transmittance characteristics of the adhesive used for the microscope objective lens for comparison.
- the resins of Examples 1 and 2 have high ultraviolet light transmittance (90% or more at 365 nm), have good transmission performance from the ultraviolet region to the visible region, and are organisms that perform fluorescence observation. It can be seen that the system can sufficiently withstand the use of a microscope objective lens.
- FIG. 3 shows fluorescence characteristics after ultraviolet irradiation of the resins of Example 3 and Comparative Example.
- the horizontal axis represents the wavelength of light
- the vertical axis represents the fluorescence intensity expressed in arbitrary units [arb.unit]. From the figure, it is understood that the fluorescence intensity of the resin of the present invention is suppressed to be very small after ultraviolet irradiation as compared with the conventional material.
- FIG. 4 shows the fluorescence characteristics of the resins of Example 3 and Comparative Example after ultraviolet irradiation.
- the resin of Example 3 has a higher light transmittance in the ultraviolet light region than the conventional material, has a good transmission performance from the ultraviolet region to the visible region, and is a biological system for performing fluorescence observation. It can be seen that it can sufficiently withstand the use of a microscope objective lens.
- Suitable polymerization initiators for the precursor composition include, for example, benzophenone, hydroxybenzophenone methanesulfonate, o-benzoylmethyl benzoate, p-chlorobenzophenone, p-dimethylaminobenzophenone, benzoin, benzoin allyl ether, benzoin methyl ether , Benzoin ethyl ether, benzoin isobutyl ether, benzoin isopropyl ether, acetophenone, diethoxyacetophenone, 1-hydroxycyclohexyl phenyl ketone, benzyl dimethyl ketal, 2-hydroxy-2-methylpropiophenone, 1- (4-isopropylphenyl)- Photopolymerization initiators such as 2-hydroxy-2-methylpropiophenone, 1-phenyl-1,2-propanedione-2-
- the addition amount can be selected within the range of 0.05 to 3 wt%, and preferably within the range of 0.07 to 0.7 wt%.
- the upper limit of the addition amount of the polymerization initiator defines a range in which the ultraviolet ray transmission property of the resin is good, and if it exceeds the above upper limit value, the ultraviolet ray transmittance is lowered, and the biological microscope objective lens is used. Unbearable for use as.
- below the lower limit of the addition amount of the polymerization initiator in order to cure the resin precursor composition, a larger amount of irradiation is required for a photopolymerization initiator, and a longer curing time is required for a thermal polymerization initiator. Is done. Furthermore, there is a possibility that the auto-fluorescence is enhanced due to deterioration of the resin due to light or thermal energy applied during curing.
- FIG. 5 shows the structure (cross-sectional shape) of a multi-contact diffractive optical element.
- the diffractive optical element includes a first diffractive optical element 1 made of a resin having a high refractive index and low dispersion, and a second diffractive optical element 2 made of a resin having a low refractive index and high dispersion, and the first and second diffractive optical elements.
- a serrated relief pattern 5 (diffraction grating pattern) is formed between the elements 1 and 2.
- the resin precursor composition reactants of Examples 1, 2, and 3 described above are resins having a low refractive index and a high dispersion, and are used as resins for the second diffractive optical element 2.
- the resin used for the high refractive index and low dispersion first diffractive optical element 1 which is the other of the above-mentioned contact multilayer optical element will be described below.
- the high refractive index and low dispersion resin constituting the first diffractive optical element 1 may be any resin as long as it is a cured reaction product of a composition exhibiting high refractive index and low dispersion characteristics.
- the thiol of Formula 2 is “tricyclodecanedimethanethiol”, commonly known as TDDT.
- the (meth) acrylate may have any configuration as long as it is a (meth) acrylate resin exhibiting low dispersibility.
- a norbornene structure there are a norbornene structure, a cyclohexane structure, an adamantane structure, a tricyclodecane structure, etc. as structures having low dispersibility, and (meth) acrylates having these structures can be used.
- (meth) acrylate having a tricyclodecane structure represented by Chemical Formula 3 is particularly preferable.
- a thiol compound having a large proportion of sulfur atoms in the compound may be blended.
- Examples of the compound having a large proportion of sulfur atoms in the compound include 2,5-dimercaptomethyl-1,4-dithiane (commonly called “DMMD”), cyclohexane-1,4-diyldimethanethiol, cyclohexane-1,4- Dithiol, bicyclo [2,2,1] heptane-2,5-dithiol, 5- (1-mercaptoethyl) bicyclo [2,2,2,1] heptane-2-thiol, (2,5-dimethyl-1, 4-dithian-2,5-diyl) dimethanethiol, 9-thiabicyclo [3,3,1] nonane-2,6-dithiol, adamantane-1,3-dithiol and the like and mixtures of these compounds.
- DMMD 2,5-dimercaptomethyl-1,4-dithiane
- Example 4 in the diffractive optical element shown in FIG. 6, the above-described TCDA and TDDT, which are the above-described high refractive index and low dispersion resin, are used as the first diffractive optical element 1, and the composition ratio (molar ratio) is 2.5: 1. ), And the above-described 2,2-bis (4- (2-acryloyloxy) ethoxy) phenyl-1,1,1, was used as the second diffractive optical element 2.
- BAHF 3,3,3-hexafluoropropane
- BMHF 2,2-bis (4- (2- (meth) acryloyloxy) ethoxy) Phenyl-1,1,1,3,3,3-hexafluoropropane
- a resin precursor composition was prepared by adding 0.1 wt% of Irgacure 184 (BASF Japan Ltd.) as an initiator. After applying this to a predetermined mold of the diffractive optical element, it is pressed with a substrate and irradiated with ultraviolet rays. The ultraviolet light irradiation was performed using an ultraviolet light irradiation machine (manufactured by Ubix Co., Ltd.) equipped with an LED that generates ultraviolet light of 365 nm.
- irradiation for 60 seconds was performed at 25 mW / cm 2 as temporary curing through the ground glass.
- Any light source may be used as long as it includes 365 nm, and a metal halide lamp, a high-pressure mercury lamp, an LED, or the like can be used.
- a metal halide lamp, a high-pressure mercury lamp, an LED, or the like can be used.
- an LED is desirable. Therefore, in this embodiment, an LED is used.
- the diffractive optical element 2 is completed by removing it from the mold.
- the ultraviolet light irradiation was performed using an ultraviolet light irradiation machine (manufactured by Ubix Co., Ltd.) equipped with an LED that generates ultraviolet light of 365 nm.
- the ground glass over performs irradiation with 25 mW / cm 2 60 seconds as the temporary curing, and then subjected to irradiation of 250 seconds at 40 mW / cm 2 as a main curing.
- Example 5 For 2,2-bis (4- (2- (meth) acryloyloxy) ethoxy) phenyl-1,1,1,3,3,3-hexafluoropropane (BMHF) (BAHF) and Example 4 Similarly, the diffractive optical element 2 was molded.
- Example 4 (Low refractive index, high dispersion optical element) BAHF, Irgacure 184 0.1 wt% (High refractive index low dispersion optical element)
- TCDA: TDDT 2.5: 1 addition reaction product, Irgacure 184 0.1 wt%
- Example 5 (Low refractive index high dispersion optical element) BMHF, Irgacure 184 0.1 wt% (High refractive index and low dispersion optical element)
- TCDA: TDDT 3: 1 addition reaction product, Irgacure 184 0.1 wt%
- Table 2 shows the grating heights of the serrated relief pattern 5 (diffraction grating pattern) formed between the first and second diffractive optical elements 1 and 2 in FIG.
- the height of the serrated relief pattern 5 formed between the first and second diffractive optical elements 1 and 2 is 25.6 ⁇ m, and in Example 5, it is 25. It was possible to set it to 5 ⁇ m.
- Table 2 As described above, the grating height of the relief pattern 5 was able to be suppressed to a very small value in both examples.
- FIG. 7 shows the diffracted light intensity of the unnecessary diffraction orders in the optical lens 10 having this configuration.
- the vertical axis represents (0 + 2) / 1st-order light, and the smaller this value, the better the diffraction performance.
- the diffractive optical element formed in the embodiment of the present application has a lower diffracted light intensity of an unnecessary order than the case where a diffractive optical element made of a conventional resin is used, and exhibits high diffraction performance. Further, it has a high diffraction efficiency for obliquely incident light, and can be used for a wide range of applications such as biological microscope objective lenses, interchangeable lenses, binoculars, telescopes, security cameras, and projectors.
- the contact multilayer optical element may be formed on one substrate, or may be sandwiched between two substrates. Either high refractive index low dispersion resin or low refractive index high dispersion resin may be formed in the first layer.
- the substrate may be a parallel plate, and may have a plano-concave shape, a plano-convex shape, a meniscus shape, or a biconvex shape.
- the contact multilayer optical element may be formed on a flat surface, or may be formed on a convex surface or a concave surface.
- the optical element of the present invention is widely used in photographing optical systems, optical systems for microscopes, optical systems for observation optical systems, and the like, and an optimum configuration can be selected as appropriate depending on the application and the form of the optical system.
- the optical element of low refractive index and high dispersion used in the present invention is not limited to Example 1-5, but is a resin precursor containing bisphenol AF ethylene oxide-modified di (meth) acrylate represented by the above-mentioned chemical formula 1 Resins obtained by curing the composition have similar characteristics.
- the resin precursor is a compound that becomes a cured resin by curing, and may include any of a monomer, an oligomer, a prepolymer, and a polymer.
- DOE diffractive optical element 1 first diffractive optical element 2 second diffractive optical element 5 relief pattern (diffraction grating pattern) 10 Lens
Abstract
Description
しかし、格子面が空気に触れている単層回折光学素子の場合、基準波長において一次回折効率を100%に出来るものの、波長が基準波長から離れるにつれ他次数の回折光が増加し、これがフレア光となる為にその光学性能を劣化させるという問題があった。この問題を解決する為、特徴的な2種類の樹脂からなる二つの格子が密着した構造を有する、密着複層型回折光学素子が考案された(例えば文献1、2)。すなわち、
(n2-n1)×h=λ (1)
式(1)において、n1、n2はそれぞれ樹脂の屈折率(n2>n1)、hは回折光学素子の格子高さ、λは波長である。
使用波長範囲において式(1)が常に成り立てば、使用波長範囲全域において一次光の回折効率が100%となり、回折光によるフレアの発生を無くすことが出来る。
なお、樹脂前駆体は硬化により樹脂硬化物となる化合物であって、モノマー、オリゴマー、プレポリマー、ポリマーのいずれを含んでいてもよい。
(化1)化学式1:
R=HもしくはCH3、m+n=1~10
本発明に係る樹脂前駆体組成物は、上記化学式1で表される組成物と重合開始剤とを含む。このときの、重合開始剤の添加量は、好ましくは、光学材料に対して、0.05~3重量%である。この添加量はさらに好ましくは、光学材料に対して、0.07~0.7重量%である。
(化2)化学式2:
m+n=1~6
(化4)化学式1:
R=HもしくはCH3
m+n=1~10
また、実施例3として2,2-ビス(4-(2-(メタ)クリロイルオキシ)エトキシ)フェニル-1,1,1,3,3,3-ヘキサフルオロプロパン(BMHF)にイルガキュア184を0.5wt%添加して前駆体組成物を準備した。
実施例1 : BMHF、イルガキュア184 0.1wt%
実施例2 : BAHF、イルガキュア184 0.1wt%
実施例3 : BMHF、イルガキュア184 0.5wt%
比較例 : 2,2,3,3,4,4,5,5,-オクタフルオロヘキサン-1,6-ジアクリレート 53wt%、
9,9-ビス[4-(2-アクリロイルオキシエトキシ)フェニル]フルオレン 42wt%、
2-フェノキシエチレングリコールアクリレート 5wt%、
光重合開始剤イルガキュア184 0.5wt%
(表1)
表1からビスフェノールAF エチレンオキサイド変性ジ(メタ)アクリレート樹脂であるBMHF、BAHFは屈折率が低く、分散が高い特性を示すことがわかる。また、比較例である従来材料aも同様に屈折率が低く、分散が高い特性を示すことがわかる。
第1回折光学要素1を構成する高屈折率低分散の樹脂としては、高屈折率低分散特性を示す組成物の硬化反応物であればどのような樹脂であってもよいが、例えば、低分散性特性を有する分子構造を有する(メタ)アクリレートと、以下の化学式2で示される高屈折率特性を有するチオールとを含む組成物の付加反応物を樹脂前駆体組成物を硬化させた樹脂が好ましい。
(化5)化学式2:
m+n=1~6
化学式2のチオールは、「トリシクロデカンジメタンチオール(tricyclodecanedimethanethiol)」で、通称TDDTである。
(化6)化学式3:
R= HまたはCH3、m+n=1~10
化学式3のアクリレートは、正式名称が「トリシクロデカンジメタノールジ(メタ)アクリレート(tricyclodecanedimethanoldi(meth)acrylate)」で、通称TCDAである。
従って、本実施例では、化学式2で示されるチオールにおいてm=1,n=1を用い、化学式3で示される(メタ)アクリレートにおいて、m=1、n=1、R=Hを用いた。
本実施例では、図6に示す回折光学素子において、第1回折光学要素1として上述した高屈折率低分散の樹脂である上述のTCDAとTDDTとを2.5:1の組成比(モル比)で付加反応させた樹脂前駆体組成物の硬化物を用い、第2回折光学要素2として上述した2,2-ビス(4-(2-アクリロイルオキシ)エトキシ)フェニル-1,1,1,3,3,3-ヘキサフルオロプロパン(BAHF)(上記化学式1において R=H、m=1,n=1)および2,2-ビス(4-(2-(メタ)クリロイルオキシ)エトキシ)フェニル-1,1,1,3,3,3-ヘキサフルオロプロパン(BMHF)(上記化学式1において R=CH3、m=1,n=1)を用いた。
光源は365nmを含むものであればよくメタルハライドランプ,高圧水銀ランプ,やLEDなどが使用可能である。なかでも特に自家蛍光を抑えたい場合にはLEDが望ましいので、本実施では、LEDを用いた。仮硬化後、金型から外し回折光学要素2が完成する。
紫外光照射は、365nmの紫外光を発生するLEDを備えた紫外光照射機(ユービックス株式会社製)を使用して行った。このとき、すりガラス越しに、仮硬化として25mW/cm2で60秒の照射を行い、次いで本硬化として40mW/cm2で250秒の照射を行った。
2,2-ビス(4-(2-(メタ)クリロイルオキシ)エトキシ)フェニル-1,1,1,3,3,3-ヘキサフルオロプロパン(BMHF)についても(BAHF)と実施例4と同様に回折光学要素2を成形した。本実施例では、高屈折率低分散光学要素として上記化学式2で表されるチオール(m=n=1)と上記化学式3で表されるメタクリレート(R=CH3、m=1、n=1)との組成物(モル比 TCDA:TDDT=3:1)のマイケル付加反応物である樹脂前駆体を用い、実施例4と同様に回折光学要素1を成形した。
実施例4 :
(低屈折率高分散光学要素) BAHF、イルガキュア184 0.1wt%
(高屈折率低分散光学要素) TCDA:TDDT=2.5:1の付加反応物、イルガキュア184 0.1wt%
実施例5 :
(低屈折率高分散光学要素) BMHF、イルガキュア184 0.1wt%
(高屈折率低分散光学要素) TCDA:TDDT=3:1の付加反応物、イルガキュア184 0.1wt%
(表2)
このように、レリーフパターン5の格子高さはどちらの実施例においても非常に小さい値に抑えることができた。
縦軸は(0+2)/1次光であり、この値が小さいほど、回折性能が優れていることを示す。本願実施例で形成した回折光学素子は従来の樹脂で構成される回折光学素子を用いた場合に比べて不要次数の回折光強度が小さく、高い回折性能を示す。また、斜入射光に対する回折効率も高く、生物系の顕微鏡対物レンズ、交換レンズ、双眼鏡、望遠鏡、防犯カメラ、プロジェクタなどの広い用途に用いることができる。
1 第1回折光学要素 2 第2回折光学要素
5 レリーフパターン(回折格子パターン)
10 レンズ
Claims (8)
- 前記化学式1で表されるビスフェノールAF エチレンオキサイド変性ジ(メタ)アクリレートはm=1,n=1である光学材料用樹脂前駆体組成物。
- 前記ビスフェノールAF エチレンオキサイド変性ジ(メタ)アクリレートに対して、0.05~3重量%の重合開始剤を含む請求項1または請求項2に記載の光学材料用樹脂前駆体組成物。
- 前記ビスフェノールAF エチレンオキサイド変性ジ(メタ)アクリレートに対して、0.07~0.7重量%の重合開始剤を含む請求項1または請求項2に記載の光学材料用樹脂前駆体組成物。
- 請求項1乃至4の前記樹脂前駆体組成物を硬化させて得られる光学要素。
- 請求項5の光学要素と、前記光学要素より高屈折率低分散の光学要素とを積層し、界面に回折格子を設けた回折光学素子。
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US15/441,698 US20170183438A1 (en) | 2014-08-26 | 2017-02-24 | Resin precursor composition for optical materials, optical element obtained from the composition, and diffractive optical element configured using the optical element |
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