WO2016158461A1 - 光学フィルターおよび光学フィルターを用いた装置 - Google Patents
光学フィルターおよび光学フィルターを用いた装置 Download PDFInfo
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- WO2016158461A1 WO2016158461A1 PCT/JP2016/058543 JP2016058543W WO2016158461A1 WO 2016158461 A1 WO2016158461 A1 WO 2016158461A1 JP 2016058543 W JP2016058543 W JP 2016058543W WO 2016158461 A1 WO2016158461 A1 WO 2016158461A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2551/00—Optical elements
Definitions
- the present invention relates to an optical filter and an apparatus using the optical filter. Specifically, the present invention relates to an optical filter containing a compound having absorption in a specific wavelength region, and a solid-state imaging device and a camera module using the optical filter.
- a solid-state image pickup device such as a video camera, a digital still camera, or a mobile phone with a camera function uses a CCD or CMOS image sensor, which is a solid-state image pickup device for a color image.
- Silicon photodiodes that are sensitive to near infrared rays that cannot be sensed by the eyes are used. These solid-state image sensors need to be corrected for visibility so that they appear natural to the human eye.
- Optical filters that selectively transmit or cut light in a specific wavelength region (for example, near-infrared cut) Filter) is often used.
- a near-infrared cut filter those manufactured by various methods are conventionally used.
- a near-infrared cut filter in which a transparent resin is used as a substrate and a near-infrared absorbing pigment is contained in the transparent resin is known (see, for example, Patent Document 1).
- the near-infrared cut filter described in Patent Document 1 may not always have sufficient near-infrared absorption characteristics.
- the present applicant has proposed a near-infrared cut filter having a norbornene-based resin substrate and a near-infrared reflective film in Patent Document 2.
- the near-infrared cut filter described in Patent Document 2 is excellent in near-infrared cut characteristics, moisture absorption resistance and impact resistance, but cannot take a wide viewing angle.
- Patent Document 3 proposes a near-infrared cut filter having both a wide viewing angle and high visible light transmittance.
- the present inventors have applied a combination of two or more compounds having an absorption maximum in a specific wavelength range, thereby achieving the desired near-infrared cut characteristics and visible transmission.
- the present inventors have found that an optical filter that can achieve a reduction in the ratio and multiple reflected light in the near-infrared wavelength region can be obtained, and the present invention has been completed. Examples of embodiments of the present invention are shown below.
- a substrate and a dielectric multilayer film on at least one surface of the substrate has a transparent resin layer containing a compound (A) having an absorption maximum at a wavelength of 600 nm or more and less than 750 nm and a compound (S) having an absorption maximum at a wavelength of 750 nm or more and 1050 nm or less, or the compound ( A transparent resin layer containing A) and a transparent resin layer containing the compound (S),
- An optical filter characterized by satisfying the following requirement (a): (A) In the wavelength region of 800 to 1000 nm, the average transmittance when measured from the vertical direction of the optical filter is 5% or less.
- substitution units A and B each independently represent any of the substitution units represented by the following formulas (I) and (II).
- R 1 to R 8 are each independently a hydrogen atom, halogen atom, sulfo group, hydroxyl group, cyano group, nitro group, carboxy group, phosphate group, —NR g R h group, —SR i group, —SO 2 R i group, —OSO 2 R i group or any of the following L a to L h , wherein R g and R h are each independently a hydrogen atom, —C (O) R i group or the following L a to L e It represents either, R i represents any of the following L a ⁇ L e, (L a ) an aliphatic hydrocarbon group having 1 to 12 carbon atoms (L
- the substituent L is an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a halogen-substituted alkyl group having 1 to 12 carbon atoms, It is at least one selected from the group consisting of an alicyclic hydrocarbon group having 3 to 14 carbon atoms, an aromatic hydrocarbon group having 6 to 14 carbon atoms, and a heterocyclic group having 3 to 14 carbon atoms.
- the transparent resin is a cyclic (poly) olefin resin, aromatic polyether resin, polyimide resin, fluorene polycarbonate resin, fluorene polyester resin, polycarbonate resin, polyamide resin, polyarylate resin, Polysulfone resin, polyethersulfone resin, polyparaphenylene resin, polyamideimide resin, polyethylene naphthalate resin, fluorinated aromatic polymer resin, (modified) acrylic resin, epoxy resin, allyl ester resin Item [1]-characterized in that it is at least one resin selected from the group consisting of curable resins, silsesquioxane ultraviolet curable resins, acrylic ultraviolet curable resins, and vinyl ultraviolet curable resins.
- the optical filter according to any one of [6]
- a solid-state imaging device comprising the optical filter according to any one of items [1] to [8].
- a camera module comprising the optical filter according to any one of items [1] to [8].
- an optical filter that has excellent near-infrared cut characteristics, is less dependent on incident angle, and has excellent transmittance characteristics in the visible wavelength region and multiple reflected light reduction effect in the near-infrared wavelength region. it can.
- FIG. 1A is a schematic diagram illustrating that light beams that are multiple-reflected between an optical filter and a lens are incident on a solid-state imaging device.
- FIG. 1- (b) is a schematic diagram showing that light beams that have been multiple-reflected inside the optical filter enter the solid-state imaging device.
- FIG. 1- (c) is a schematic diagram showing that light beams that are multiple-reflected between the optical filter and the solid-state image sensor enter the solid-state image sensor.
- FIG. 1- (d) is a schematic diagram showing that light beams that have been multiple-reflected between the optical filter and the solid-state image sensor enter the solid-state image sensor.
- FIG. 2A is a schematic diagram illustrating a method for measuring the transmittance when measured from the vertical direction of the optical filter.
- FIG. 2B is a schematic diagram illustrating a method of measuring the transmittance when measured from an angle of 30 ° with respect to the vertical direction of the optical filter.
- FIG. 2C is a schematic diagram illustrating a method of measuring the reflectance when measured from an angle of 30 ° with respect to the vertical direction of the optical filter.
- FIG.2 (d) is schematic which shows the method of measuring the reflectance at the time of measuring from an angle of 5 degrees with respect to the perpendicular direction of the glass for vapor deposition monitors.
- FIGS. 3A and 3B are schematic views showing an example of a preferable configuration of the optical filter of the present invention.
- FIG. 4 is a spectral transmission spectrum of the substrate obtained in Example 1.
- FIG. 4 is a spectral transmission spectrum of the substrate obtained in Example 1.
- FIG. 5A is a spectral reflection spectrum measured from an angle of 5 ° with respect to the vertical direction of the dielectric multilayer film (I) prepared in Example 1
- FIG. 2 is a spectral reflection spectrum measured from an angle of 5 ° with respect to the vertical direction of the dielectric multilayer film (II) prepared in 1.
- FIG. 6 is a spectral transmission spectrum of the optical filter obtained in Example 1.
- FIG. 7 shows the optical filter obtained in Example 1 at 30 ° with respect to the vertical direction of the optical filter when the light incident surface is on the dielectric multilayer film (II) (second optical layer) side. It is a spectral reflection spectrum measured from an angle.
- FIG. 8 is a spectral transmission spectrum of the base material obtained in Example 2.
- FIG. 9 is a spectral transmission spectrum of the optical filter obtained in Example 2.
- FIG. 10 shows the optical filter obtained in Example 2 at 30 ° with respect to the vertical direction of the optical filter when the light incident surface is on the dielectric multilayer film (IV) (second optical layer) side. It is a spectral reflection spectrum measured from an angle.
- IV dielectric multilayer film
- the optical filter according to the present invention has a transparent resin layer containing at least one compound (A) having an absorption maximum at a wavelength of 600 nm or more and less than 750 nm and one or more compounds (S) having an absorption maximum at a wavelength of 750 nm or more and 1050 nm or less. Formed on at least one surface of the substrate (i) or the substrate (i) having the transparent resin layer containing the compound (A) and the transparent resin layer containing the compound (S), and the substrate (i) And a dielectric multilayer film.
- the optical filter of the present invention is an optical filter that has excellent near-infrared cut characteristics, low incidence angle dependency, and excellent transmittance characteristics in the visible wavelength region and multiple reflected light reduction effect in the near-infrared wavelength region. is there.
- the transmittance in the near infrared wavelength region is low.
- the light receiving sensitivity of the solid-state imaging device is relatively high in the wavelength region of 800 to 1000 nm. By reducing the transmittance in this wavelength region, it is effective to correct the visibility of the camera image and the human eye. And excellent color reproducibility can be achieved.
- the optical filter of the present invention has an average transmittance of 5% or less, preferably 4% or less, more preferably 3% or less, particularly preferably 2 when measured from the vertical direction of the optical filter in a wavelength region of 800 to 1000 nm. % Or less.
- the average transmittance at a wavelength of 800 to 1000 nm is in this range, it is preferable because near infrared rays can be sufficiently cut and excellent color reproducibility can be achieved.
- the visible light transmittance is high.
- the average transmittance when measured from the vertical direction of the optical filter is preferably 75% or more, more preferably 80% or more, still more preferably 83% or more, particularly preferably. 85% or more.
- excellent imaging sensitivity can be achieved when the optical filter of the present invention is used as a solid-state imaging device.
- the optical filter of the present invention has the shortest wavelength value (Xa) at which the transmittance when measured from the vertical direction of the optical filter is 50% in the wavelength range of 560 to 800 nm and the vertical direction of the optical filter. It is preferable that the absolute value of the difference from the wavelength value (Xb) at which the transmittance when measured from an angle of 30 ° is 50% is smaller.
- the absolute value of the difference between (Xa) and (Xb) is preferably less than 20 nm, more preferably less than 15 nm, and particularly preferably less than 10 nm.
- Such an optical filter can be obtained by forming a dielectric multilayer film on the substrate (i).
- the optical filter of the present invention has a dielectric multilayer film on at least one surface of the substrate (i).
- the dielectric multilayer film of the present invention is a film having the ability to reflect near infrared rays.
- the near-infrared reflective film may be provided on one side of the substrate (i) or may be provided on both sides. When it is provided on one side, it is possible to obtain an optical filter that is excellent in production cost and manufacturability and has high strength and is less likely to warp or twist when provided on both sides.
- the optical filter is applied to a solid-state imaging device, it is preferable that the optical filter is less warped or twisted. Therefore, it is preferable to provide a dielectric multilayer film on both surfaces of the resin substrate.
- the dielectric multilayer film preferably has a reflection characteristic over the entire wavelength range of 700 to 1100 nm, more preferably has a reflection characteristic over the entire wavelength range of 700 to 1150 nm, and particularly preferably 700 to 1200 nm.
- a second optical layer having a second optical layer (see FIG. 3 (a)), or a third optical device mainly having reflection characteristics in the vicinity of a wavelength of 700 to 1150 nm when measured from an angle of 5 ° with respect to the vertical direction of the optical filter.
- Examples include a layer having a layer on one side of the substrate (i) and a fourth optical layer having an antireflection property in the visible region on the other surface of the substrate (i) (see FIG. 3B). It is done.
- the optical filter of the present invention contains the compound (S) in the substrate (i), at least one surface of the optical filter is inclined even if it has a dielectric multilayer film having near-infrared reflection characteristics.
- the reflectance when near infrared rays are incident from the direction can be reduced.
- the first optical layer is provided on one side of the optical filter and the second optical layer is provided on the other side, or the third optical layer is provided on the other side of the optical filter. This tendency becomes remarkable when the fourth optical layer is provided.
- the applicant of the present invention is that near-infrared wavelength light incident from an oblique direction with respect to the vertical direction, particularly oblique incident light with a wavelength of 815 to 935 nm, is a major cause of various ghosts during multiple reflection.
- the minimum reflectance measured from at least one surface when measured from an angle of 30 ° with respect to the vertical direction of the optical filter is preferably 80% or less, more preferably 75. % Or less, particularly preferably 70% or less.
- the reflectance is in such a range, it is preferable when used for a solid-state imaging device, because various ghosts derived from multiple reflected light tend to be reduced particularly when shooting a scene including a light source in a dark place. .
- the thickness of the optical filter of the present invention may be appropriately selected according to the desired application. However, according to the recent trend of thinning and weight reduction of solid-state imaging devices, the thickness of the optical filter of the present invention is also thin. Is preferred. Since the optical filter of the present invention includes the substrate (i), it can be thinned.
- the thickness of the optical filter of the present invention is preferably, for example, preferably 200 ⁇ m or less, more preferably 180 ⁇ m or less, further preferably 150 ⁇ m or less, particularly preferably 120 ⁇ m or less, and the lower limit is not particularly limited, but for example, 20 ⁇ m It is desirable to be.
- the substrate (i) may be a single layer or a multilayer, and has a transparent resin layer containing at least one compound (A) and one compound (S), or a compound (A). What is necessary is just to have a transparent resin layer containing the transparent resin layer and compound (S) which contain.
- the substrate (i) is a single layer, for example, a substrate composed of a transparent resin substrate (ii) containing the compound (A) and the compound (S) can be mentioned, and this transparent resin substrate (ii) Becomes the transparent resin layer.
- a transparent resin layer such as an overcoat layer made of a curable resin containing the compound (A) and the compound (S) on a support such as a glass support or a base resin support.
- the lowest transmittance (Ta) measured from the vertical direction of the substrate (i) is preferably 40% or less, more preferably 25% or less, and particularly preferably 10% or less. is there.
- the shortest wavelength (Xc) at which the transmittance measured in the vertical direction of the substrate (i) in the region of wavelength 600 nm or more is more than 50% to 50% is preferably 610 to 670 nm, more preferably 620 to 665 nm. Particularly preferred is 630 to 660 nm.
- the lowest transmittance (Tb) measured from the vertical direction of the substrate (i) is preferably 80% or less, more preferably 70% or less, and particularly preferably 60% or less. is there.
- the average transmittance of the substrate (i) at a wavelength of 430 to 580 nm is preferably 75% or more, more preferably 78% or more, and particularly preferably 80% or more.
- a substrate having such transmission characteristics is used, high light transmission characteristics can be achieved in the visible range, and a highly sensitive camera function can be achieved.
- the thickness of the base material (i) can be appropriately selected according to a desired application, and is not particularly limited. However, it is desirable and preferably selected appropriately so as to reduce the incident angle dependency of the obtained optical filter. Is 10 to 200 ⁇ m, more preferably 15 to 180 ⁇ m, particularly preferably 20 to 150 ⁇ m.
- the optical filter using the substrate (i) can be thinned and reduced in weight, and can be suitably used for various applications such as a solid-state imaging device. it can.
- the base material (i) made of the transparent resin substrate (ii) is used in a lens unit such as a camera module, it is preferable because the lens unit can be reduced in height and weight.
- the compound (A) is not particularly limited as long as it has an absorption maximum at a wavelength of 600 nm or more and less than 750 nm, but is preferably a solvent-soluble dye compound, and is a group consisting of a squarylium compound, a phthalocyanine compound, and a cyanine compound. More preferably, it is at least one selected from the above, more preferably contains a squarylium compound, more preferably contains at least one squarylium compound and another compound (A), and other compound (A). Particularly preferred are phthalocyanine compounds and cyanine compounds.
- the squarylium-based compound has excellent visible light permeability, steep absorption characteristics, and a high molar extinction coefficient, but may generate fluorescence that causes scattered light during light absorption. In such a case, an optical filter with less scattered light and better camera image quality can be obtained by using a combination of the squarylium compound and the other compound (A).
- the absorption maximum wavelength of the compound (A) is preferably 620 nm or more and 748 nm or less, more preferably 650 nm or more and 745 nm or less, and particularly preferably 660 nm or more and 740 nm or less.
- the content of the compound (A) includes, as the base material (i), for example, a base material made of a transparent resin substrate (ii) containing the compound (A) and the compound (S), or the compound (A).
- a base material in which a resin layer such as an overcoat layer made of a curable resin containing the compound (S) is laminated on the transparent resin substrate (iv) to be used, with respect to 100 parts by weight of the transparent resin , Preferably 0.01 to 2.0 parts by weight, more preferably 0.02 to 1.5 parts by weight, particularly preferably 0.03 to 1.0 parts by weight.
- a base material on which a resin layer such as an overcoat layer made of, etc. is used it is preferably 0.1 to 5. with respect to 100 parts by weight of the resin forming the transparent resin layer containing the compound (A).
- the amount is 0 part by weight, more preferably 0.2 to 4.0 parts by weight, particularly preferably 0.3 to 3.0 parts by weight.
- the compound (S) is not particularly limited as long as it has an absorption maximum at a wavelength of 750 nm or more and 1050 nm or less, but is preferably a solvent-soluble dye compound, and is preferably a squarylium compound, a phthalocyanine compound, a cyanine compound, or a naphthalocyanine. It is more preferable that it is at least one selected from the group consisting of a series compound, a pyrrolopyrrole compound, a croconium compound, a hexaphyrin compound, a metal dithiolate compound, and a ring extended BODIPY (boron dipyrromethene) compound.
- the compound is at least one selected from the group consisting of a compound based on a compound, a cyanine compound, a pyrrolopyrrole compound, and a metal dithiolate compound, and particularly a squarylium compound represented by the following formula (Z).
- a compound (S) it is possible to simultaneously achieve high near-infrared cut characteristics near the absorption maximum and good visible light transmittance.
- substitution units A and B each independently represent any of the substitution units represented by the following formulas (I) and (II).
- R 1 to R 8 are each independently a hydrogen atom, halogen atom, sulfo group, hydroxyl group, cyano group, nitro group, carboxy group, phosphate group, —NR g R h group, —SR i group, —SO 2 R i group, —OSO 2 R i group or any of the following L a to L h , wherein R g and R h are each independently a hydrogen atom, —C (O) R i group or the following L a to L e It represents either, R i represents any of the following L a ⁇ L e, (L a ) an aliphatic hydrocarbon group having 1 to 12 carbon atoms (L
- the substituent L is an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a halogen-substituted alkyl group having 1 to 12 carbon atoms, It is at least one selected from the group consisting of an alicyclic hydrocarbon group having 3 to 14 carbon atoms, an aromatic hydrocarbon group having 6 to 14 carbon atoms, and a heterocyclic group having 3 to 14 carbon atoms.
- R 1 is preferably a hydrogen atom, chlorine atom, fluorine atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, cyclohexyl group, phenyl group.
- R 2 to R 7 are preferably each independently a hydrogen atom, chlorine atom, fluorine atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, or tert-butyl.
- cyclohexyl group phenyl group, hydroxyl group, amino group, dimethylamino group, cyano group, nitro group, methoxy group, ethoxy group, n-propoxy group, n-butoxy group, acetylamino group, propionylamino group, N-methylacetyl Amino group, trifluoromethanoylamino group, pentafluoroethanoylamino group, t-butanoylamino group, cyclohexinoylamino group, n-butylsulfonyl group, methylthio group, ethylthio group, n-propylthio group, n-butylthio More preferably a hydrogen atom, a chlorine atom, a fluorine atom, a methyl group, an Group, n-propyl group, isopropyl group, tert-butyl group, hydroxyl group, di
- R 8 is preferably a hydrogen atom, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, cyclohexyl group, n-pentyl group, n -Hexyl group, n-heptyl group, n-octyl group, n-octyl group, n-nonyl group, n-decyl group, phenyl group, more preferably hydrogen atom, methyl group, ethyl group, n-propyl group , Isopropyl group, n-butyl group, tert-butyl group and n-decyl group.
- X is preferably an oxygen atom, a sulfur atom or —NR 8 —, particularly preferably an oxygen atom or a sulfur atom in the substitution unit of the formula (I), and — in the substitution unit of the formula (II).
- NR 8 - is.
- the squarylium-based compound can also represent the structure by a description method such as the following formula (S2) and a description method that takes a resonance structure as the following formula (S2). That is, the difference between the following formula (S1) and the following formula (S2) is only the structure description method, and both represent the same compound.
- the structure of the squarylium compound is represented by a description method such as the following formula (S1).
- the compound represented by the following formula (S1) and the compound represented by the following formula (S3) can be regarded as the same compound.
- the left and right units bonded to the central four-membered ring are the same or different as long as they are represented by the formula (I) or the formula (II), respectively. However, it is preferable that they are the same including the substituents in the unit because they are easy to synthesize. That is, among the compounds represented by the formula (Z), those represented by the following formula (III) or formula (IV) are preferable.
- Specific examples of the compound represented by the formula (Z) include, for example, the compounds (s-1) to (s-58) described in the following Tables 1 and 2, and the compound (s- 59) and the compound (s-60).
- the squarylium compound, cyanine compound, pyrrolopyrrole compound, and metal dithiolate compound other than the squarylium compound represented by the formula (Z) are not particularly limited as long as they have an absorption maximum at a wavelength of 750 nm to 1050 nm. Examples thereof include the following compounds (s-61) to (s-67).
- the absorption maximum wavelength of the compound (S) is 750 nm or more and 1050 nm or less, preferably 770 nm or more and 1000 nm or less, more preferably 780 nm or more and 970 nm or less, further preferably 790 nm or more and 960 nm or less, and particularly preferably 800 nm or more and 950 nm or less.
- the absorption maximum wavelength of the compound (S) is in such a range, unnecessary near infrared rays that cause various ghosts can be efficiently cut.
- the compound (S) may be synthesized by a generally known method.
- JP-A-1-228960, JP-A-2001-40234, JP-A-3094037, JP-A-3196383, etc. Can be synthesized with reference to the method described in the above.
- the content of the compound (S) includes, as the base material (i), for example, a base material composed of a transparent resin substrate (ii) containing the compound (A) and the compound (S), or the compound (S).
- a base material in which a resin layer such as an overcoat layer composed of a curable resin containing the compound (A) is laminated on the transparent resin substrate (iii) to be used, with respect to 100 parts by weight of the transparent resin , Preferably 0.01 to 2.0 parts by weight, more preferably 0.02 to 1.5 parts by weight, particularly preferably 0.03 to 1.0 parts by weight.
- a base material on which a resin layer such as an overcoat layer made of fat is laminated it is preferably 0.1 to 5 with respect to 100 parts by weight of the resin forming the transparent resin layer containing the compound (A).
- 0.0 parts by weight more preferably 0.2 to 4.0 parts by weight, particularly preferably 0.3 to 3.0 parts by weight.
- the base material (i) may further contain other dye (X) that does not correspond to the compound (A) and the compound (S).
- dyes (X) are not particularly limited as long as the absorption maximum wavelength is less than 600 nm or more than 1050 nm, but those having an absorption maximum wavelength of more than 1050 nm are preferable.
- examples of such dyes include squarylium compounds, phthalocyanine compounds, cyanine compounds, naphthalocyanine compounds, croconium compounds, octaphyrin compounds, diimonium compounds, pyrrolopyrrole compounds, and boron dipyrromethene (BODIPY).
- BODIPY boron dipyrromethene
- the transparent resin layer and the transparent resin substrates (ii) to (iv) to be laminated on the resin support or the glass support can be formed using a transparent resin.
- transparent resin used for the said base material (i) 1 type may be individual and 2 or more types may be sufficient.
- the transparent resin is not particularly limited as long as it does not impair the effects of the present invention.
- it ensures thermal stability and moldability to a film, and dielectrics are formed by high-temperature deposition performed at a deposition temperature of 100 ° C. or higher.
- Tg glass transition temperature
- the glass transition temperature of the resin is 140 ° C. or higher because a film capable of depositing a dielectric multilayer film at a higher temperature can be obtained.
- the total light transmittance (JIS K7105) of the resin plate is preferably 75 to 95%, more preferably 78 to 95. %, Particularly preferably 80 to 95% of the resin can be used. If a resin having a total light transmittance in such a range is used, the resulting substrate exhibits good transparency as an optical film.
- the weight average molecular weight (Mw) in terms of polystyrene measured by a gel permeation chromatography (GPC) method of the transparent resin is usually 15,000 to 350,000, preferably 30,000 to 250,000.
- the average molecular weight (Mn) is usually 10,000 to 150,000, preferably 20,000 to 100,000.
- transparent resins examples include cyclic (poly) olefin resins, aromatic polyether resins, polyimide resins, fluorene polycarbonate resins, fluorene polyester resins, polycarbonate resins, polyamide (aramid) resins, and polyarylate resins.
- examples thereof include resins, allyl ester curable resins, silsesquioxane ultraviolet curable resins, acrylic ultraviolet curable resins, and vinyl ultraviolet curable resins.
- the cyclic (poly) olefin resin is at least one monomer selected from the group consisting of a monomer represented by the following formula (X 0 ) and a monomer represented by the following formula (Y 0 ) And a resin obtained by hydrogenating the resin are preferred.
- R x1 to R x4 each independently represents an atom or group selected from the following (i ′) to (ix ′), and k x , mx and p x are each independently 0 Or represents a positive integer.
- R x1 and R x2 or R x3 and R x4 are bonded to each other to form a monocyclic or polycyclic hydrocarbon ring or heterocyclic ring (provided that R x1 to R which are not involved in the bond) x4 each independently represents an atom or group selected from (i ′) to (vi ′).
- Ix ′ A monocyclic hydrocarbon ring or heterocycle formed by bonding R x2 and R x3 to each other (provided that R x1 and R x4 not involved in the bonding are each independently the above (i Represents an atom or group selected from ') to (vi').
- R y1 and R y2 each independently represent an atom or group selected from the above (i ′) to (vi ′), or R y1 and R y2 are bonded to each other formed monocyclic or polycyclic alicyclic hydrocarbon, an aromatic hydrocarbon or heterocyclic, k y and p y are each independently, represent 0 or a positive integer.
- the aromatic polyether-based resin preferably has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2).
- R 1 to R 4 each independently represents a monovalent organic group having 1 to 12 carbon atoms, and a to d each independently represents an integer of 0 to 4.
- R 1 ⁇ R 4 and a ⁇ d independently has the same meaning as R 1 ⁇ R 4 and a ⁇ d of the formula (1)
- Y represents a single bond
- -SO 2 -Or> C O
- R 7 and R 8 each independently represent a halogen atom, a monovalent organic group having 1 to 12 carbon atoms or a nitro group
- g and h each independently represent 0 to 4
- m represents 0 or 1.
- R 7 is not a cyano group.
- the aromatic polyether resin further has at least one structural unit selected from the group consisting of a structural unit represented by the following formula (3) and a structural unit represented by the following formula (4). Is preferred.
- R 5 and R 6 each independently represents a monovalent organic group having 1 to 12 carbon atoms
- Z represents a single bond, —O—, —S—, —SO 2 —,> C ⁇ O, —CONH—, —COO— or a divalent organic group having 1 to 12 carbon atoms
- e and f each independently represent an integer of 0 to 4, and n represents 0 or 1.
- R 7 , R 8 , Y, m, g and h are each independently synonymous with R 7 , R 8 , Y, m, g and h in formula (2), and R 5 , R 6 , Z, n, e and f are each independently synonymous with R 5 , R 6 , Z, n, e and f in the formula (3).
- the polyimide resin is not particularly limited as long as it is a polymer compound containing an imide bond in a repeating unit.
- the method described in JP-A-2006-199945 and JP-A-2008-163107 is used. Can be synthesized.
- the fluorene polycarbonate resin is not particularly limited as long as it is a polycarbonate resin containing a fluorene moiety, and can be synthesized, for example, by the method described in JP-A-2008-163194.
- the fluorene polyester resin is not particularly limited as long as it is a polyester resin containing a fluorene moiety.
- the fluorene polyester resin can be synthesized by the method described in JP 2010-285505 A or JP 2011-197450 A. Can do.
- the fluorinated aromatic polymer resin is not particularly limited, but is selected from the group consisting of an aromatic ring having at least one fluorine atom, an ether bond, a ketone bond, a sulfone bond, an amide bond, an imide bond, and an ester bond.
- the polymer preferably contains a repeating unit containing at least one bond, and can be synthesized, for example, by the method described in JP-A-2008-181121.
- the acrylic ultraviolet curable resin is not particularly limited, but is synthesized from a resin composition containing a compound having one or more acrylic or methacrylic groups in the molecule and a compound that decomposes by ultraviolet rays to generate active radicals. Can be mentioned.
- the acrylic ultraviolet curable resin is a base material in which a transparent resin layer containing a compound (S) and a curable resin is laminated on a glass support or a base resin support as the base (i)
- a base material in which a resin layer such as an overcoat layer made of a curable resin or the like is laminated on the transparent resin substrate (ii) containing the compound (S)
- it is particularly preferably used as the curable resin. be able to.
- ⁇ Commercial product ⁇ The following commercial products etc. can be mentioned as a commercial item of transparent resin.
- Examples of commercially available cyclic (poly) olefin-based resins include Arton manufactured by JSR Co., Ltd., ZEONOR manufactured by Nippon Zeon Co., Ltd., APEL manufactured by Mitsui Chemicals, Inc., and TOPAS manufactured by Polyplastics Co., Ltd. .
- Examples of commercially available polyethersulfone resins include Sumika Excel PES manufactured by Sumitomo Chemical Co., Ltd.
- Examples of commercially available polyimide resins include Neoprim L manufactured by Mitsubishi Gas Chemical Co., Ltd.
- Examples of commercially available polycarbonate resins include Pure Ace manufactured by Teijin Limited.
- Examples of commercially available fluorene polycarbonate resins include Iupizeta EP-5000 manufactured by Mitsubishi Gas Chemical Co., Ltd.
- Examples of commercially available fluorene polyester resins include OKP4HT manufactured by Osaka Gas Chemical Co., Ltd.
- Examples of commercially available acrylic resins include NIPPON CATALYST ACRYVIEWER.
- Examples of commercially available silsesquioxane-based ultraviolet curable resins include Silplus manufactured by Nippon Steel Chemical Co., Ltd.
- the base material (i) may further contain additives such as an antioxidant, a near-ultraviolet absorber, and a fluorescence quencher as long as the effects of the present invention are not impaired. These other components may be used alone or in combination of two or more.
- Examples of the near ultraviolet absorber include azomethine compounds, indole compounds, benzotriazole compounds, and triazine compounds.
- Examples of the antioxidant include 2,6-di-t-butyl-4-methylphenol, 2,2′-dioxy-3,3′-di-t-butyl-5,5′-dimethyldiphenylmethane, tetrakis [Methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, tris (2,4-di-t-butylphenyl) phosphite and the like.
- additives may be mixed with a resin or the like when the base material (i) is produced, or may be added when a resin is synthesized.
- the addition amount is appropriately selected according to the desired properties, but is usually 0.01 to 5.0 parts by weight, preferably 0.05 to 2.0 parts by weight, based on 100 parts by weight of the resin. Part.
- the base material (i) is a base material containing the transparent resin substrates (ii) to (iv)
- the transparent resin substrates (ii) to (iv) are obtained by, for example, melt molding or cast molding.
- a coating material such as an antireflection agent, a hard coating agent and / or an antistatic agent is coated to produce a substrate on which an overcoat layer is laminated. Can do.
- a transparent resin layer such as an overcoat layer made of a curable resin containing the compound (A) and the compound (S) is laminated on a glass substrate or a resin substrate as a base.
- a resin solution containing the compound (A) and the compound (S) is coated on a glass support or a base resin support, for example, a glass support or a base.
- the solvent is dried and removed, and if necessary, light irradiation or heating is performed to form a transparent resin layer on the glass support or the base resin support.
- the manufactured base material can be manufactured.
- melt molding a method of melt-molding pellets obtained by melt-kneading resin, compound (A), compound (S) and the like; resin, compound (A) and compound (S Or a resin composition containing a compound (A), a compound (S), a resin and a solvent, a pellet obtained by removing the solvent from the resin composition, and the like.
- melt molding method include injection molding, melt extrusion molding, and blow molding.
- ⁇ Cast molding As the cast molding, a method of removing a solvent by casting a resin composition containing the compound (A), the compound (S), a resin and a solvent on an appropriate support; or the compound (A) and the compound (S ), A method in which a curable composition containing a photocurable resin and / or a thermosetting resin is cast on an appropriate support to remove the solvent, and then cured by an appropriate method such as ultraviolet irradiation or heating. It can also be manufactured by, for example.
- the base material (i) is a base material made of a transparent resin substrate (ii) containing the compound (A) and the compound (S)
- the base material (i) is supported after casting.
- the substrate (i) can be obtained by peeling the coating film from the body, and the substrate (i) is a compound (A) and compound (A) on a support such as a glass support or a resin support as a base.
- the base material (i) is obtained by not peeling the coating film after cast molding. Obtainable.
- the support examples include a glass plate, a steel belt, a steel drum, and a support made of a transparent resin (for example, a polyester film and a cyclic olefin resin film).
- a transparent resin for example, a polyester film and a cyclic olefin resin film.
- the optical component such as glass plate, quartz or transparent plastic is coated with the resin composition and the solvent is dried, or the curable composition is coated and cured and dried.
- a transparent resin layer can also be formed on the component.
- the amount of residual solvent in the transparent resin layer (transparent resin substrate (ii)) obtained by the above method should be as small as possible.
- the amount of the residual solvent is preferably 3% by weight or less, more preferably 1% by weight or less, and still more preferably 0.8% by weight with respect to the weight of the transparent resin layer (transparent resin substrate (ii)). 5% by weight or less.
- the amount of residual solvent is in the above range, a transparent resin layer (transparent resin substrate (ii)) that can easily exhibit a desired function is obtained, in which deformation and characteristics are hardly changed.
- dielectric multilayer film examples include those in which high refractive index material layers and low refractive index material layers are alternately stacked.
- a material constituting the high refractive index material layer a material having a refractive index of 1.7 or more can be used, and a material having a refractive index of usually 1.7 to 2.5 is selected.
- Such materials include titanium oxide, zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide, or indium oxide as the main components, and titanium oxide, tin oxide, and / or Alternatively, a material containing a small amount of cerium oxide or the like (for example, 0 to 10% by weight with respect to the main component) can be used.
- a material having a refractive index of 1.6 or less can be used, and a material having a refractive index of usually 1.2 to 1.6 is selected.
- examples of such materials include silica, alumina, lanthanum fluoride, magnesium fluoride, and sodium hexafluoride sodium.
- the method for laminating the high refractive index material layer and the low refractive index material layer is not particularly limited as long as a dielectric multilayer film in which these material layers are laminated is formed.
- a high-refractive index material layer and a low-refractive index material layer are alternately laminated directly on the substrate (i) by CVD, sputtering, vacuum deposition, ion-assisted deposition, or ion plating.
- a dielectric multilayer film can be formed.
- each of the high refractive index material layer and the low refractive index material layer is usually preferably from 0.1 ⁇ to 0.5 ⁇ , where ⁇ (nm) is the near infrared wavelength to be blocked.
- the value of ⁇ (nm) is, for example, 700 to 1400 nm, preferably 750 to 1300 nm.
- the optical thickness obtained by multiplying the refractive index (n) by the thickness (d) (n ⁇ d) by ⁇ / 4 the high refractive index material layer, and the low refractive index.
- the thicknesses of the respective layers of the refractive index material layer are almost the same value, and there is a tendency that the blocking / transmission of a specific wavelength can be easily controlled from the relationship between the optical characteristics of reflection / refraction.
- the total number of high refractive index material layers and low refractive index material layers in the dielectric multilayer film is preferably 16 to 70 layers, more preferably 20 to 60 layers, as a whole. If the thickness of each layer, the thickness of the dielectric multilayer film as a whole of the optical filter, and the total number of layers are within the above ranges, a sufficient manufacturing margin can be secured, and the warpage of the optical filter and cracks in the dielectric multilayer film can be reduced. can do.
- Appropriate selection of thickness, stacking order, and number of stacks ensures sufficient transmittance in the visible range and sufficient light cut characteristics in the near-infrared wavelength range, and is close to the oblique direction. The reflectance when infrared rays are incident can be reduced.
- optical thin film design software for example, manufactured by Essential Macleod, Thin Film Center Co., Ltd.
- optical thin film design software for example, manufactured by Essential Macleod, Thin Film Center Co., Ltd.
- the target transmittance at a wavelength of 400 to 700 nm is set to 100%
- the target Tolerance value is set to 1
- the target transmittance at a wavelength of 705 to 950 nm is set to 0%.
- Parameter setting method such as setting Target Tolerance value to 0.5 can be mentioned.
- These parameters can change the value of Target Tolerance by further finely dividing the wavelength range according to various characteristics of the substrate (i).
- the optical filter between the substrate (i) and the dielectric multilayer film is on the side opposite to the surface on which the dielectric multilayer film of the substrate (i) is provided.
- the surface hardness of the substrate (i) or the dielectric multilayer film is improved, the chemical resistance is improved, the antistatic A functional film such as an antireflection film, a hard coat film, or an antistatic film can be appropriately provided for the purpose of scratch removal.
- the optical filter of the present invention may include one layer made of the functional film or two or more layers.
- the optical filter of the present invention may include two or more similar layers or two or more different layers.
- the method of laminating the functional film is not particularly limited, but a coating agent such as an antireflection agent, a hard coating agent and / or an antistatic agent is melted in the base material (i) or the dielectric multilayer film as described above.
- a coating agent such as an antireflection agent, a hard coating agent and / or an antistatic agent is melted in the base material (i) or the dielectric multilayer film as described above.
- Examples of the method include molding or cast molding.
- it can also be produced by applying a curable composition containing the coating agent or the like on the substrate (i) or the dielectric multilayer film with a bar coater or the like and then curing it by ultraviolet irradiation or the like.
- the coating agent examples include ultraviolet (UV) / electron beam (EB) curable resins and thermosetting resins. Specifically, vinyl compounds, urethanes, urethane acrylates, acrylates, epoxy And epoxy acrylate resins. Examples of the curable composition containing these coating agents include vinyl, urethane, urethane acrylate, acrylate, epoxy, and epoxy acrylate curable compositions.
- UV ultraviolet
- EB electron beam
- the curable composition may contain a polymerization initiator.
- a polymerization initiator a known photopolymerization initiator or a thermal polymerization initiator can be used, and a photopolymerization initiator and a thermal polymerization initiator may be used in combination.
- a polymerization initiator may be used individually by 1 type, and may use 2 or more types together.
- the blending ratio of the polymerization initiator in the curable composition is preferably 0.1 to 10% by weight, more preferably 0.5 to 10% by weight, when the total amount of the curable composition is 100% by weight. More preferably, it is 1 to 5% by weight.
- a functional film such as an antireflective film, a hard coat film or an antistatic film having excellent curing characteristics and handleability of the curable composition and having a desired hardness. it can.
- organic solvent may be added as a solvent to the curable composition, and known organic solvents can be used.
- organic solvents include alcohols such as methanol, ethanol, isopropanol, butanol and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; ethyl acetate, butyl acetate, ethyl lactate, ⁇ -butyrolactone, propylene Esters such as glycol monomethyl ether acetate and propylene glycol monoethyl ether acetate; Ethers such as ethylene glycol monomethyl ether and diethylene glycol monobutyl ether; Aromatic hydrocarbons such as benzene, toluene and xylene; Dimethylformamide, dimethylacetamide, N- Examples include amides such as methylpyrrolidone. These solvents may be used alone or in combination
- the thickness of the functional film is preferably 0.1 to 20 ⁇ m, more preferably 0.5 to 10 ⁇ m, and particularly preferably 0.7 to 5 ⁇ m.
- the base material (i) and the functional film and / or the dielectric multilayer film may be applied to the surface of the multilayer film.
- the optical filter of the present invention has a wide viewing angle and has excellent near-infrared cutting ability and the like. Therefore, it is useful for correcting the visibility of a solid-state imaging device such as a CCD or CMOS image sensor of a camera module.
- a solid-state imaging device such as a CCD or CMOS image sensor of a camera module.
- digital still cameras, smartphone cameras, mobile phone cameras, digital video cameras, wearable device cameras, PC cameras, surveillance cameras, automotive cameras, TVs, car navigation systems, personal digital assistants, video game machines, and portable game machines It is useful for fingerprint authentication system, digital music player, etc. Furthermore, it is also useful as a heat ray cut filter attached to a glass plate of an automobile or a building.
- the solid-state imaging device of the present invention includes the optical filter of the present invention.
- the solid-state imaging device is an image sensor including a solid-state imaging device such as a CCD or a CMOS image sensor.
- a digital still camera a camera for a smartphone, a camera for a mobile phone, a camera for a wearable device, a digital camera It can be used for applications such as video cameras.
- the camera module of the present invention includes the optical filter of the present invention.
- Parts means “parts by weight” unless otherwise specified.
- the measurement method of each physical property value and the evaluation method of the physical property are as follows.
- the molecular weight of the resin was measured by the following method (a) or (b) in consideration of the solubility of each resin in a solvent.
- GPC gel permeation chromatography
- Standard polystyrene equivalent weight average molecular weight (Mw) and number average molecular weight (Mn) were measured using a GPC apparatus (HLC-8220 type, column: TSKgel ⁇ -M, developing solvent: THF) manufactured by Tosoh Corporation.
- the logarithmic viscosity was measured by the following method (c) instead of the molecular weight measurement by the said method.
- C A part of the polyimide resin solution was added to anhydrous methanol to precipitate the polyimide resin, and filtered to separate from the unreacted monomer.
- Tg Glass transition temperature
- DSC6200 differential scanning calorimeter
- the base material (Ta), (Xc), and (Tb), and the transmittance in each wavelength region of the optical filter, (Xa) and (Xb), are spectrophotometers (U- 4100).
- the transmittance when measured from the vertical direction of the optical filter the light transmitted perpendicular to the filter is measured as shown in FIG. 2A, and the angle is 30 ° with respect to the vertical direction of the optical filter.
- the transmittance when measured from the above the light transmitted at an angle of 30 ° with respect to the vertical direction of the filter as shown in FIG. 2B was measured.
- the reflectance when measured from an angle of 30 ° with respect to the vertical direction of the optical filter is measured by setting the optical filter on a jig attached to the apparatus as shown in FIG.
- the reflectance when measured from an angle of 5 ° with respect to the vertical direction of the glass was measured by setting an optical filter in a jig attached to the apparatus as shown in FIG.
- this transmittance is measured using the spectrophotometer under the condition that light is perpendicularly incident on the substrate and the filter, except when measuring (Xb).
- it is measured using the spectrophotometer under the condition that light is incident at an angle of 30 ° with respect to the vertical direction of the filter.
- Dodec-3-ene hereinafter also referred to as “DNM”) 100 parts, 1-hexene (molecular weight regulator) 18 parts, and toluene (ring-opening polymerization solvent) 300 parts nitrogen-substituted reaction The vessel was charged and the solution was heated to 80 ° C.
- the obtained resin A had a number average molecular weight (Mn) of 32,000, a weight average molecular weight (Mw) of 137,000, and a glass transition temperature (Tg) of 165 ° C.
- the obtained resin B had a number average molecular weight (Mn) of 75,000, a weight average molecular weight (Mw) of 188,000, and a glass transition temperature (Tg) of 285 ° C.
- resin C A part of this polyimide resin solution was poured into 1 L of methanol to precipitate the polyimide.
- the IR spectrum of the obtained resin C was measured, 1704 cm -1 characteristic of imido group, absorption of 1770 cm -1 were observed.
- Resin C had a glass transition temperature (Tg) of 310 ° C. and a logarithmic viscosity of 0.87.
- Example 1 an optical filter having a base material made of a transparent resin substrate was prepared according to the following procedure and conditions.
- a dielectric multilayer film (I) is formed as a first optical layer on one side of the obtained base material, and a dielectric multilayer film (II) is formed as a second optical layer on the other side of the base material.
- an optical filter having a thickness of about 0.104 mm was obtained.
- the dielectric multilayer film (I) is formed by alternately laminating silica (SiO 2 ) layers and titania (TiO 2 ) layers at a deposition temperature of 100 ° C. (26 layers in total).
- the dielectric multilayer film (II) is formed by alternately laminating silica (SiO 2 ) layers and titania (TiO 2 ) layers at a deposition temperature of 100 ° C. (20 layers in total).
- the silica layer and the titania layer are in order of the titania layer, the silica layer, the titania layer,..., The silica layer, the titania layer, and the silica layer from the substrate side.
- the outermost layer of the optical filter was a silica layer.
- the dielectric multilayer films (I) and (II) were designed as follows. Regarding the thickness and the number of layers of each layer, the wavelength-dependent characteristics of the base material refractive index and the applied compound (S) and compound (in order to achieve the antireflection effect in the visible range and the selective transmission / reflection performance in the near infrared range, Optimization was performed using optical thin film design software (Essential Macleod, manufactured by Thin Film Center) according to the absorption characteristics of A). When performing optimization, in this example, the input parameters (Target values) to the software are as shown in Table 3 below.
- the dielectric multilayer film (I) is formed by alternately stacking a silica layer having a film thickness of 31 to 157 nm and a titania layer having a film thickness of 10 to 95 nm.
- the dielectric multi-layer film (II) is a multi-layer vapor-deposited film having 20 layers, in which a silica layer having a thickness of 38 to 199 nm and a titania layer having a thickness of 12 to 117 nm are alternately stacked. It was.
- Table 4 An example of the optimized film configuration is shown in Table 4, and the spectral reflectance spectrum measured from an angle of 5 ° from the vertical direction of the glass substrate for the vapor deposition monitor in which each dielectric multilayer film is formed on one side as a single figure is shown. As shown in FIG.
- the surface on which the dielectric multilayer film is not formed is painted with black acrylic paint to prevent the influence of back reflection, and after applying antireflection treatment, The surface on which the body multilayer film was formed was used as the incident surface for the measurement light.
- the spectral transmittance measured from the vertical direction of the obtained optical filter and an angle of 30 ° from the vertical direction was measured, and the optical characteristics in each wavelength region were evaluated.
- the results are shown in FIG. Moreover, when the spectral reflectance measured from the angle of 30 ° with respect to the vertical direction of each surface of the obtained optical filter was measured, the incident surface of the light beam was set to the dielectric multilayer film (II) side (second optical layer side). As a result, it was confirmed that the minimum reflectance value at a wavelength of 815 to 935 nm was small.
- FIG. 7 shows a spectral reflectance spectrum measured from an angle of 30 ° from the vertical direction of the optical filter when the light incident surface is on the dielectric multilayer film (II) side.
- the average value of the transmittance at a wavelength of 430 to 580 nm is 88%
- the average value of the transmittance at a wavelength of 800 to 1000 nm is 1% or less, and at least when measured from an angle of 30 ° with respect to the vertical direction at a wavelength of 815 to 935 nm
- the minimum reflectance measured from one surface was 61%
- was 3 nm.
- Example 2 In Example 1, instead of 0.02 part of compound (s-11), 0.005 part of compound (s-27) (absorption maximum wavelength 868 nm in dichloromethane) described in Table 1 was used, and As compound (A), 0.03 part of compound (a-3) represented by the following formula (a-3) (maximum absorption wavelength 703 nm in dichloromethane) and a compound represented by the following formula (a-4) ( a-4) Transparent resin substrate containing compound (S) and compound (A) under the same procedure and conditions as in Example 1 except that 0.07 part (absorption maximum wavelength in dichloromethane 736 nm) was used A substrate consisting of The spectral transmittance of this substrate was measured, and (Ta), (Tb) and (Xc) were determined. The results are shown in FIG.
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as a first optical layer on one side of the obtained base material (26 layers in total).
- the multilayer film (III) is formed, and a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as the second optical layer on the other surface of the base material (20 layers in total).
- a dielectric multilayer film (IV) was formed to obtain an optical filter having a thickness of about 0.104 mm.
- the dielectric multilayer film was designed using the same design parameters as in Example 1 in consideration of the wavelength dependency of the base material refractive index.
- the spectral transmittance of the obtained optical filter was measured, and the optical characteristics in each wavelength region were evaluated. The results are shown in FIG. Moreover, when the spectral reflectance measured from the angle of 30 ° with respect to the vertical direction of each surface of the obtained optical filter was measured, the incident surface of the light beam was set to the dielectric multilayer film (IV) side (second optical layer side). As a result, it was confirmed that the minimum reflectance value at a wavelength of 815 to 935 nm was small.
- FIG. 10 shows a spectral reflectance spectrum measured from an angle of 30 ° from the vertical direction of the optical filter when the light incident surface is on the dielectric multilayer film (IV) side.
- Example 3 an optical filter having a base material composed of a transparent resin substrate having a resin layer on both sides was prepared according to the following procedure and conditions.
- Example 1 0.02 part of the compound (s-25) shown in Table 1 (maximum absorption wavelength 781 nm in dichloromethane) was used instead of 0.02 part of the compound (s-11), and Example 1 except that 0.03 part of compound (a-1), 0.01 part of compound (a-3) and 0.08 part of compound (a-4) were used as compound (A).
- a transparent resin substrate containing the compound (S) and the compound (A) was obtained under the same procedure and conditions.
- a resin composition (1) having the following composition was applied to one side of the obtained transparent resin substrate with a bar coater and heated in an oven at 70 ° C. for 2 minutes to volatilize and remove the solvent. At this time, the coating conditions of the bar coater were adjusted so that the thickness after drying was 2 ⁇ m. Next, it exposed using the conveyor type exposure machine (exposure amount 500mJ / cm ⁇ 2 >, 200mW), the resin composition (1) was hardened, and the resin layer was formed on the substrate made from transparent resin. Similarly, a resin layer made of the resin composition (1) is formed on the other surface of the transparent resin substrate, and the resin layers are formed on both surfaces of the transparent resin substrate containing the compound (S) and the compound (A). A substrate was obtained. The spectral transmittance of this substrate was measured to determine (Ta), (Tb), and (Xc). The results are shown in Table 5.
- Resin composition (1) 60 parts by weight of tricyclodecane dimethanol acrylate, 40 parts by weight of dipentaerythritol hexaacrylate, 5 parts by weight of 1-hydroxycyclohexyl phenyl ketone, methyl ethyl ketone (solvent, solid content concentration (TSC): 30%)
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as a first optical layer on one side of the obtained base material (26 layers in total).
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as the second optical layer on the other surface of the substrate (20 layers in total).
- a dielectric multilayer film (VI) was formed to obtain an optical filter having a thickness of about 0.108 mm.
- the dielectric multilayer film was designed using the same design parameters as in Example 1 in consideration of the wavelength dependence of the refractive index of the substrate as in Example 1. The spectral transmittance and spectral reflectance of this optical filter were measured, and the optical characteristics in each wavelength region were evaluated. The results are shown in Table 5.
- Example 4 an optical filter having a base material composed of a resin substrate having a transparent resin layer containing the compound (S) and the compound (A) on both surfaces was prepared according to the following procedure and conditions.
- Resin A and methylene chloride obtained in Resin Synthesis Example 1 were added to a container to prepare a solution having a resin concentration of 20% by weight, and the resin was used in the same manner as in Example 1 except that the obtained solution was used.
- a substrate was made.
- a resin layer made of the resin composition (2) having the following composition is formed on both surfaces of the resin substrate obtained in the same manner as in Example 3, and a transparent resin layer containing the compound (S) and the compound (A) is formed on both surfaces.
- a base material made of a resin substrate was obtained. The spectral transmittance of this substrate was measured, and (Ta), (Tb) and (Xc) were determined. The results are shown in Table 5.
- Resin composition (2) 100 parts by weight of tricyclodecane dimethanol acrylate, 4 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 0.50 part by weight of compound (s-11), 0.75 part by weight of compound (a-1) , 0.75 parts by weight of compound (a-2), methyl ethyl ketone (solvent, TSC: 25%)
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as a first optical layer on one side of the obtained base material (26 layers in total).
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as the second optical layer on the other surface of the base material (total 20 layers).
- a dielectric multilayer film (VIII) was formed to obtain an optical filter having a thickness of about 0.108 mm.
- the dielectric multilayer film was designed using the same design parameters as in Example 1 in consideration of the wavelength dependence of the refractive index of the substrate as in Example 1. The spectral transmittance and spectral reflectance of this optical filter were measured, and the optical characteristics in each wavelength region were evaluated. The results are shown in Table 5.
- Example 5 an optical filter having a base material composed of a transparent glass substrate having a transparent resin layer containing the compound (S) and the compound (A) on one side was prepared according to the following procedure and conditions.
- a resin composition (3) having the following composition was applied by a spin coater.
- the solvent was volatilized and removed by heating on a hot plate at 80 ° C. for 2 minutes.
- coating conditions of the spin coater were adjusted so that the thickness after drying might be set to 2 micrometers.
- Resin composition (3) 20 parts by weight of tricyclodecane dimethanol acrylate, 80 parts by weight of dipentaerythritol hexaacrylate, 4 parts by weight of 1-hydroxycyclohexyl phenyl ketone, 1.0 part by weight of compound (s-11), compound ( a-1) 1.5 parts by weight, compound (a-2) 1.5 parts by weight, methyl ethyl ketone (solvent, TSC: 35%)
- a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as a first optical layer on one side of the obtained base material (26 layers in total).
- a multilayer film (IX) is formed, and a silica (SiO 2 ) layer and a titania (TiO 2 ) layer are alternately laminated as a second optical layer on the other surface of the base material (20 layers in total)
- a dielectric multilayer film (X) was formed to obtain an optical filter having a thickness of about 0.108 mm.
- the dielectric multilayer film was designed using the same design parameters as in Example 1 in consideration of the wavelength dependence of the refractive index of the substrate as in Example 1. The spectral transmittance of this optical filter was measured, and the optical characteristics in each wavelength region were evaluated. The results are shown in Table 5.
- Example 6 to 15 A base material and an optical filter were prepared in the same manner as in Example 3 except that the resin, the solvent, the drying conditions for the resin substrate, the compound (S), and the compound (A) were changed as shown in Table 5.
- Table 5 shows the optical properties of the obtained substrate and optical filter.
- Example 1 In Example 1, a substrate and an optical filter were prepared in the same manner as in Example 1 except that the compound (S) and the compound (A) were not used. Table 5 shows the optical properties of the obtained substrate and optical filter.
- Example 2 The same as Example 3 except that the compound (S) was not used and 0.03 part of the compound (a-1) and 0.03 part of the compound (a-2) were used as the compound (A). Thus, a base material and an optical filter were prepared. Table 5 shows the optical properties of the obtained substrate and optical filter.
- Example 3 An optical filter was prepared in the same manner as in Example 1 except that a transparent glass substrate “OA-10G (thickness: 200 ⁇ m)” (manufactured by Nippon Electric Glass Co., Ltd.) was used as the substrate. Table 5 shows the optical characteristics of the base material and the obtained optical filter.
- Form (1) Transparent resin substrate containing compound (S) and compound (A)
- Form (2) Transparent resin substrate containing compound (S) and compound (A) has resin layers on both sides
- Form (3 ) A transparent resin layer containing the compound (S) and the compound (A) is provided on both surfaces of the resin substrate.
- Form (4) A transparent resin layer containing the compound (S) and the compound (A) on one surface of the glass substrate.
- Form (5) A transparent resin substrate containing no compound (S) or compound (A) (Comparative Example)
- Form (6) having resin layers on both surfaces of a transparent resin substrate containing the compound (A) (Comparative Example)
- Form (7) Glass substrate (comparative example)
- Resin A Cyclic olefin resin (resin synthesis example 1)
- Resin B Aromatic polyether resin (resin synthesis example 2)
- Resin C Polyimide resin (resin synthesis example 3)
- Resin D Cyclic olefin resin “Zeonor 1420R” (manufactured by Nippon Zeon Co., Ltd.)
- Compound (a-6) A squarylium compound represented by the following formula (a-6) (absorption maximum wavelength in dichloromethane: 713 nm)
- Solvent (1) Methylene chloride
- Solvent (2) N, N-dimethylacetamide
- Solvent (3) Cyclohexane / xylene (weight ratio: 7/3)
- the optical filter of the present invention is a digital still camera, a mobile phone camera, a digital video camera, a personal computer camera, a surveillance camera, an automobile camera, a television, an in-vehicle device for a car navigation system, a portable information terminal, a video game machine, a mobile phone. It can be suitably used for game machines, fingerprint authentication system devices, digital music players, and the like. Furthermore, it can be suitably used as a heat ray cut filter or the like attached to glass or the like of automobiles and buildings.
- Optical filter 2 Spectrophotometer 3: Light 4: Lens 5: Solid-state imaging device 6: Multiple reflection light 7: Reflection mirror 8: Dielectric multilayer film 9: Glass for vapor deposition monitor (back surface is treated with antireflection film) 10: Substrate (i) 11: First optical layer 12: Second optical layer 13: Third optical layer 14: Fourth optical layer
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Abstract
Description
該基材が、波長600nm以上750nm未満に吸収極大を有する化合物(A)と、波長750nm以上1050nm以下に吸収極大を有する化合物(S)とを含む透明樹脂層を有し、または、前記化合物(A)を含む透明樹脂層および前記化合物(S)を含む透明樹脂層を有し、
下記要件(a)を満たすことを特徴とする光学フィルター:
(a)波長800~1000nmの領域において、光学フィルターの垂直方向から測定した場合の透過率の平均値が5%以下である。
(b)波長430~580nmの領域において、光学フィルターの垂直方向から測定した場合の透過率の平均値が75%以上である。
Xは、独立に酸素原子、硫黄原子、セレン原子、テルル原子または-NR8-を表し、
R1~R8は、それぞれ独立に水素原子、ハロゲン原子、スルホ基、水酸基、シアノ基、ニトロ基、カルボキシ基、リン酸基、-NRgRh基、-SRi基、-SO2Ri基、-OSO2Ri基または下記La~Lhのいずれかを表し、RgおよびRhは、それぞれ独立に水素原子、-C(O)Ri基または下記La~Leのいずれかを表し、Riは下記La~Leのいずれかを表し、
(La)炭素数1~12の脂肪族炭化水素基
(Lb)炭素数1~12のハロゲン置換アルキル基
(Lc)炭素数3~14の脂環式炭化水素基
(Ld)炭素数6~14の芳香族炭化水素基
(Le)炭素数3~14の複素環基
(Lf)炭素数1~12のアルコキシ基
(Lg)置換基Lを有してもよい炭素数1~12のアシル基、
(Lh)置換基Lを有してもよい炭素数1~12のアルコキシカルボニル基
置換基Lは、炭素数1~12の脂肪族炭化水素基、炭素数1~12のハロゲン置換アルキル基、炭素数3~14の脂環式炭化水素基、炭素数6~14の芳香族炭化水素基および炭素数3~14の複素環基からなる群より選ばれる少なくとも1種である。
[6] 前記化合物(A)がスクアリリウム系化合物、フタロシアニン系化合物およびシアニン系化合物からなる群より選ばれる少なくとも1種の化合物であることを特徴とする項[1]~[5]のいずれか1項に記載の光学フィルター。
[9] 固体撮像装置用である項[1]~[8]のいずれか1項に記載の光学フィルター。
[11] 項[1]~[8]のいずれか1項に記載の光学フィルターを具備するカメラモジュール。
[光学フィルター]
本発明に係る光学フィルターは、波長600nm以上750nm未満に吸収極大を有する化合物(A)と、波長750nm以上1050nm以下に吸収極大を有する化合物(S)とをそれぞれ1種以上含む透明樹脂層を有する基材(i)、または、化合物(A)を含む透明樹脂層および化合物(S)を含む透明樹脂層を有する基材(i)と、前記基材(i)の少なくとも一方の面上に形成された誘電体多層膜とを有する。このため、本発明の光学フィルターは、近赤外線カット特性に優れ、入射角依存性が少なく、可視波長域での透過率特性および近赤外波長領域の多重反射光低減効果に優れた光学フィルターである。
前記基材(i)は、単層であっても多層であってもよく、化合物(A)および化合物(S)をそれぞれ1種以上含む透明樹脂層を有し、または、化合物(A)を含む透明樹脂層および化合物(S)を含む透明樹脂層を有すればよい。基材(i)が単層の場合は、例えば、化合物(A)と化合物(S)を含む透明樹脂製基板(ii)からなる基材を挙げることができ、この透明樹脂製基板(ii)が前記透明樹脂層となる。多層の場合は、例えば、ガラス支持体やベースとなる樹脂製支持体などの支持体上に化合物(A)と化合物(S)を含有する硬化性樹脂等からなるオーバーコート層などの透明樹脂層が積層された基材、化合物(S)を含む透明樹脂製基板(iii)上に化合物(A)を含む硬化性樹脂等からなるオーバーコート層などの樹脂層が積層された基材、化合物(A)を含む透明樹脂製基板(iv)上に化合物(S)を含む硬化性樹脂等からなるオーバーコート層などの樹脂層が積層された基材、化合物(A)と化合物(S)を含む透明樹脂製基板(ii)上に硬化性樹脂等からなるオーバーコート層などの樹脂層が積層された基材などを挙げることができる。製造コストや光学特性調整の容易性、さらに、樹脂製支持体や透明樹脂製基板(ii)の傷消し効果を達成できることや基材(i)の耐傷つき性向上等の点から、化合物(A)と化合物(S)を含有する透明樹脂製基板(ii)上に硬化性樹脂からなるオーバーコート層などの樹脂層が積層された基材が特に好ましい。なお、基材(i)の支持体としてガラス支持体を用いる場合、基材の強度や薄型化対応の観点から近赤外吸収剤を含まないガラス支持体が特に好ましい。
波長600nm以上750nm未満の領域において、前記基材(i)の垂直方向から測定した最も低い透過率(Ta)は、好ましくは40%以下、さらに好ましくは25%以下、特に好ましくは10%以下である。
化合物(A)は、波長600nm以上750nm未満に吸収極大を有すれば特に制限されないが、溶剤可溶型の色素化合物であることが好ましく、スクアリリウム系化合物、フタロシアニン系化合物およびシアニン系化合物からなる群より選ばれる少なくとも1種であることがより好ましく、スクアリリウム系化合物を含むことがさらに好ましく、スクアリリウム系化合物とその他の化合物(A)をそれぞれ1種以上含むことがさらに好ましく、その他の化合物(A)としてはフタロシアニン系化合物およびシアニン系化合物が特に好ましい。
化合物(S)は、波長750nm以上1050nm以下に吸収極大を有すれば特に制限されないが、溶剤可溶型の色素化合物であることが好ましく、スクアリリウム系化合物、フタロシアニン系化合物、シアニン系化合物、ナフタロシアニン系化合物、ピロロピロール系化合物、クロコニウム系化合物、ヘキサフィリン系化合物、金属ジチオラート系化合物、および環拡張BODIPY(ボロンジピロメテン)系化合物からなる群より選ばれる少なくとも1種であることがより好ましく、スクアリリウム系化合物、シアニン系化合物、ピロロピロール系化合物、および金属ジチオラート系化合物からなる群より選ばれる少なくとも1種であることがさらに好ましく、下記式(Z)で表されるスクアリリウム系化合物であることが特に好ましい。このような化合物(S)を用いることにより、吸収極大付近での高い近赤外線カット特性と良好な可視光透過率を同時に達成することができる。
Xは、独立に酸素原子、硫黄原子、セレン原子、テルル原子または-NR8-を表し、
R1~R8は、それぞれ独立に水素原子、ハロゲン原子、スルホ基、水酸基、シアノ基、ニトロ基、カルボキシ基、リン酸基、-NRgRh基、-SRi基、-SO2Ri基、-OSO2Ri基または下記La~Lhのいずれかを表し、RgおよびRhは、それぞれ独立に水素原子、-C(O)Ri基または下記La~Leのいずれかを表し、Riは下記La~Leのいずれかを表し、
(La)炭素数1~12の脂肪族炭化水素基
(Lb)炭素数1~12のハロゲン置換アルキル基
(Lc)炭素数3~14の脂環式炭化水素基
(Ld)炭素数6~14の芳香族炭化水素基
(Le)炭素数3~14の複素環基
(Lf)炭素数1~12のアルコキシ基
(Lg)置換基Lを有してもよい炭素数1~12のアシル基、
(Lh)置換基Lを有してもよい炭素数1~12のアルコキシカルボニル基
置換基Lは、炭素数1~12の脂肪族炭化水素基、炭素数1~12のハロゲン置換アルキル基、炭素数3~14の脂環式炭化水素基、炭素数6~14の芳香族炭化水素基および炭素数3~14の複素環基からなる群より選ばれる少なくとも1種である。
前記基材(i)には、さらに、化合物(A)および化合物(S)に該当しない、その他の色素(X)が含まれていてもよい。
樹脂製支持体やガラス支持体などに積層する透明樹脂層および透明樹脂製基板(ii)~(iv)は、透明樹脂を用いて形成することができる。
前記基材(i)に用いる透明樹脂としては、1種単独でもよいし、2種以上でもよい。
環状(ポリ)オレフィン系樹脂としては、下記式(X0)で表される単量体および下記式(Y0)で表される単量体からなる群より選ばれる少なくとも1種の単量体から得られる樹脂、および当該樹脂を水素添加することで得られる樹脂が好ましい。
(i')水素原子
(ii')ハロゲン原子
(iii')トリアルキルシリル基
(iv')酸素原子、硫黄原子、窒素原子またはケイ素原子を含む連結基を有する、置換または非置換の炭素数1~30の炭化水素基
(v')置換または非置換の炭素数1~30の炭化水素基
(vi')極性基(但し、(iv')を除く。)
(vii')Rx1とRx2またはRx3とRx4とが、相互に結合して形成されたアルキリデン基(但し、前記結合に関与しないRx1~Rx4は、それぞれ独立に前記(i')~(vi')より選ばれる原子または基を表す。)
(viii')Rx1とRx2またはRx3とRx4とが、相互に結合して形成された単環もしくは多環の炭化水素環または複素環(但し、前記結合に関与しないRx1~Rx4は、それぞれ独立に前記(i')~(vi')より選ばれる原子または基を表す。)
(ix')Rx2とRx3とが、相互に結合して形成された単環の炭化水素環または複素環(但し、前記結合に関与しないRx1とRx4は、それぞれ独立に前記(i')~(vi')より選ばれる原子または基を表す。)
芳香族ポリエーテル系樹脂は、下記式(1)で表される構造単位および下記式(2)で表される構造単位からなる群より選ばれる少なくとも1種の構造単位を有することが好ましい。
ポリイミド系樹脂としては、特に制限されず、繰り返し単位にイミド結合を含む高分子化合物であればよく、例えば、特開2006-199945号公報や特開2008-163107号公報に記載されている方法で合成することができる。
フルオレンポリカーボネート系樹脂としては、特に制限されず、フルオレン部位を含むポリカーボネート樹脂であればよく、例えば、特開2008-163194号公報に記載されている方法で合成することができる。
フルオレンポリエステル系樹脂としては、特に制限されず、フルオレン部位を含むポリエステル樹脂であればよく、例えば、特開2010-285505号公報や特開2011-197450号公報に記載されている方法で合成することができる。
フッ素化芳香族ポリマー系樹脂としては、特に制限されないが、フッ素原子を少なくとも1つ有する芳香族環と、エーテル結合、ケトン結合、スルホン結合、アミド結合、イミド結合およびエステル結合からなる群より選ばれる少なくとも1つの結合を含む繰り返し単位とを含有するポリマーであることが好ましく、例えば特開2008-181121号公報に記載されている方法で合成することができる。
アクリル系紫外線硬化型樹脂としては、特に制限されないが、分子内に一つ以上のアクリル基もしくはメタクリル基を有する化合物と、紫外線によって分解して活性ラジカルを発生させる化合物を含有する樹脂組成物から合成されるものを挙げることができる。アクリル系紫外線硬化型樹脂は、前記基材(i)として、ガラス支持体上やベースとなる樹脂製支持体上に化合物(S)および硬化性樹脂を含む透明樹脂層が積層された基材や、化合物(S)を含有する透明樹脂製基板(ii)上に硬化性樹脂等からなるオーバーコート層などの樹脂層が積層された基材を用いる場合、該硬化性樹脂として特に好適に使用することができる。
透明樹脂の市販品としては、以下の市販品等を挙げることができる。環状(ポリ)オレフィン系樹脂の市販品としては、JSR(株)製アートン、日本ゼオン(株)製ゼオノア、三井化学(株)製APEL、ポリプラスチックス(株)製TOPASなどを挙げることができる。ポリエーテルサルホン系樹脂の市販品としては、住友化学(株)製スミカエクセルPESなどを挙げることができる。ポリイミド系樹脂の市販品としては、三菱ガス化学(株)製ネオプリムLなどを挙げることができる。ポリカーボネート系樹脂の市販品としては、帝人(株)製ピュアエースなどを挙げることができる。フルオレンポリカーボネート系樹脂の市販品としては、三菱ガス化学(株)製ユピゼータEP-5000などを挙げることができる。フルオレンポリエステル系樹脂の市販品としては、大阪ガスケミカル(株)製OKP4HTなどを挙げることができる。アクリル系樹脂の市販品としては、(株)日本触媒製アクリビュアなどを挙げることができる。シルセスキオキサン系紫外線硬化型樹脂の市販品としては、新日鐵化学(株)製シルプラスなどを挙げることができる。
前記基材(i)は、本発明の効果を損なわない範囲において、さらに酸化防止剤、近紫外線吸収剤および蛍光消光剤等の添加剤を含有してもよい。これらその他成分は、1種単独で用いてもよいし、2種以上を併用してもよい。
前記酸化防止剤としては、例えば2,6-ジ-t-ブチル-4-メチルフェノール、2,2'-ジオキシ-3,3'-ジ-t-ブチル-5,5'-ジメチルジフェニルメタン、テトラキス[メチレン-3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]メタン、およびトリス(2,4-ジ-t-ブチルフェニル)ホスファイトなどが挙げられる。
前記基材(i)が、前記透明樹脂製基板(ii)~(iv)を含む基材である場合、該透明樹脂製基板(ii)~(iv)は、例えば、溶融成形またはキャスト成形により形成することができ、さらに、必要により、成形後に、反射防止剤、ハードコート剤および/または帯電防止剤等のコーティング剤をコーティングすることで、オーバーコート層が積層された基材を製造することができる。
前記溶融成形としては、具体的には、樹脂と化合物(A)と化合物(S)等とを溶融混練りして得られたペレットを溶融成形する方法;樹脂と化合物(A)と化合物(S)とを含有する樹脂組成物を溶融成形する方法;または、化合物(A)、化合物(S)、樹脂および溶剤を含む樹脂組成物から溶剤を除去して得られたペレットを溶融成形する方法などが挙げられる。溶融成形方法としては、射出成形、溶融押出成形またはブロー成形などを挙げることができる。
前記キャスト成形としては、化合物(A)、化合物(S)、樹脂および溶剤を含む樹脂組成物を適当な支持体の上にキャスティングして溶剤を除去する方法;または化合物(A)、化合物(S)、光硬化性樹脂および/または熱硬化性樹脂とを含む硬化性組成物を適当な支持体の上にキャスティングして溶媒を除去した後、紫外線照射や加熱などの適切な手法により硬化させる方法などにより製造することもできる。
誘電体多層膜としては、高屈折率材料層と低屈折率材料層とを交互に積層したものが挙げられる。高屈折率材料層を構成する材料としては、屈折率が1.7以上の材料を用いることができ、屈折率が通常は1.7~2.5の材料が選択される。このような材料としては、例えば、酸化チタン、酸化ジルコニウム、五酸化タンタル、五酸化ニオブ、酸化ランタン、酸化イットリウム、酸化亜鉛、硫化亜鉛または酸化インジウム等を主成分とし、酸化チタン、酸化錫および/または酸化セリウム等を少量(例えば、主成分に対して0~10重量%)含有させたものが挙げられる。
本発明の光学フィルターは、本発明の効果を損なわない範囲において、基材(i)と誘電体多層膜との間、基材(i)の誘電体多層膜が設けられた面と反対側の面、または誘電体多層膜の基材(i)が設けられた面と反対側の面に、基材(i)や誘電体多層膜の表面硬度の向上、耐薬品性の向上、帯電防止および傷消しなどの目的で、反射防止膜、ハードコート膜や帯電防止膜などの機能膜を適宜設けることができる。
これら溶剤は、1種単独で用いてもよいし、2種以上を併用してもよい。
本発明の光学フィルターは、視野角が広く、優れた近赤外線カット能等を有しする。したがって、カメラモジュールのCCDやCMOSイメージセンサー等の固体撮像素子の視感度補正用として有用である。特に、デジタルスチルカメラ、スマートフォン用カメラ、携帯電話用カメラ、デジタルビデオカメラ、ウェアラブルデバイス用カメラ、PCカメラ、監視カメラ、自動車用カメラ、テレビ、カーナビゲーション、携帯情報端末、ビデオゲーム機、携帯ゲーム機、指紋認証システム、デジタルミュージックプレーヤー等に有用である。さらに、自動車や建物等のガラス板等に装着される熱線カットフィルターなどとしても有用である。
本発明の固体撮像装置は、本発明の光学フィルターを具備する。ここで、固体撮像装置とは、CCDやCMOSイメージセンサー等といった固体撮像素子を備えたイメージセンサーであり、具体的にはデジタルスチルカメラ、スマートフォン用カメラ、携帯電話用カメラ、ウェアラブルデバイス用カメラ、デジタルビデオカメラ等の用途に用いることができる。例えば、本発明のカメラモジュールは、本発明の光学フィルターを具備する。
樹脂の分子量は、各樹脂の溶剤への溶解性等を考慮し、下記の(a)または(b)の方法にて測定を行った。
(a)ウオターズ(WATERS)社製のゲルパーミエ-ションクロマトグラフィー(GPC)装置(150C型、カラム:東ソー社製Hタイプカラム、展開溶剤:o-ジクロロベンゼン)を用い、標準ポリスチレン換算の重量平均分子量(Mw)および数平均分子量(Mn)を測定した。
(b)東ソー社製GPC装置(HLC-8220型、カラム:TSKgelα‐M、展開溶剤:THF)を用い、標準ポリスチレン換算の重量平均分子量(Mw)および数平均分子量(Mn)を測定した。
(c)ポリイミド樹脂溶液の一部を無水メタノールに投入してポリイミド樹脂を析出させ、ろ過して未反応単量体から分離した。80℃で12時間真空乾燥して得られたポリイミド0.1gをN-メチル-2-ピロリドン20mLに溶解し、キャノン-フェンスケ粘度計を使用して30℃における対数粘度(μ)を下記式により求めた。
μ={ln(ts/t0)}/C
t0:溶媒の流下時間
ts:希薄高分子溶液の流下時間
C:0.5g/dL
エスアイアイ・ナノテクノロジーズ株式会社製の示差走査熱量計(DSC6200)を用いて、昇温速度:毎分20℃、窒素気流下で測定した。
基材の(Ta)、(Xc)、および(Tb)、ならびに、光学フィルターの各波長域における透過率、(Xa)および(Xb)は、株式会社日立ハイテクノロジーズ製の分光光度計(U-4100)を用いて測定した。
下記実施例で用いた化合物(A)および化合物(S)は、一般的に知られている方法で合成した。一般的合成方法としては、例えば、特許第3366697号公報、特許第2846091号公報、特許第2864475号公報、特許第3703869号公報、特開昭60-228448号公報、特開平1-146846号公報、特開平1-228960号公報、特許第4081149号公報、特開昭63-124054号公報、「フタロシアニン -化学と機能―」(アイピーシー、1997年)、特開2007-169315号公報、特開2009-108267号公報、特開2010-241873号公報、特許第3699464号公報、特許第4740631号公報などに記載されている方法を挙げることができる。
下記式(a)で表される8-メチル-8-メトキシカルボニルテトラシクロ[4.4.0.12,5.17,10]ドデカ-3-エン(以下「DNM」ともいう。)100部、1-ヘキセン(分子量調節剤)18部およびトルエン(開環重合反応用溶媒)300部を、窒素置換した反応容器に仕込み、この溶液を80℃に加熱した。次いで、反応容器内の溶液に、重合触媒として、トリエチルアルミニウムのトルエン溶液(0.6mol/リットル)0.2部と、メタノール変性の六塩化タングステンのトルエン溶液(濃度0.025mol/リットル)0.9部とを添加し、この溶液を80℃で3時間加熱攪拌することにより開環重合反応させて開環重合体溶液を得た。この重合反応における重合転化率は97%であった。
3Lの4つ口フラスコに2,6-ジフルオロベンゾニトリル35.12g(0.253mol)、9,9-ビス(4-ヒドロキシフェニル)フルオレン87.60g(0.250mol)、炭酸カリウム41.46g(0.300mol)、N,N-ジメチルアセトアミド(以下「DMAc」ともいう。)443gおよびトルエン111gを添加した。続いて、4つ口フラスコに温度計、撹拌機、窒素導入管付き三方コック、ディーンスターク管および冷却管を取り付けた。次いで、フラスコ内を窒素置換した後、得られた溶液を140℃で3時間反応させ、生成する水をディーンスターク管から随時取り除いた。水の生成が認められなくなったところで、徐々に温度を160℃まで上昇させ、そのままの温度で6時間反応させた。室温(25℃)まで冷却後、生成した塩をろ紙で除去し、ろ液をメタノールに投じて再沈殿させ、ろ別によりろ物(残渣)を単離した。得られたろ物を60℃で一晩真空乾燥し、白色粉末(以下「樹脂B」ともいう。)を得た(収率95%)。得られた樹脂Bは、数平均分子量(Mn)が75,000、重量平均分子量(Mw)が188,000であり、ガラス転移温度(Tg)が285℃であった。
温度計、撹拌器、窒素導入管、側管付き滴下ロート、ディーンスターク管および冷却管を備えた500mLの5つ口フラスコに、窒素気流下、1,4-ビス(4-アミノ-α,α-ジメチルベンジル)ベンゼン27.66g(0.08モル)および4,4’-ビス(4-アミノフェノキシ)ビフェニル7.38g(0.02モル)を入れて、γ―ブチロラクトン68.65g及びN,N-ジメチルアセトアミド17.16gに溶解させた。得られた溶液を、氷水バスを用いて5℃に冷却し、同温に保ちながら1,2,4,5-シクロヘキサンテトラカルボン酸二無水物22.62g(0.1モル)およびイミド化触媒としてトリエチルアミン0.50g(0.005モル)を一括添加した。添加終了後、180℃に昇温し、随時留出液を留去させながら、6時間還流させた。反応終了後、内温が100℃になるまで空冷した後、N,N-ジメチルアセトアミド143.6gを加えて希釈し、攪拌しながら冷却し、固形分濃度20重量%のポリイミド樹脂溶液264.16gを得た。このポリイミド樹脂溶液の一部を1Lのメタノール中に注ぎいれてポリイミドを沈殿させた。濾別したポリイミドをメタノールで洗浄した後、100℃の真空乾燥機中で24時間乾燥させて白色粉末(以下「樹脂C」ともいう。)を得た。得られた樹脂CのIRスペクトルを測定したところ、イミド基に特有の1704cm-1、1770cm-1の吸収が見られた。樹脂Cはガラス転移温度(Tg)が310℃であり、対数粘度を測定したところ、0.87であった。
実施例1では、透明樹脂製基板からなる基材を有する光学フィルターを以下の手順および条件で作成した。
各層の厚さと層数については、可視域の反射防止効果と近赤外域の選択的な透過・反射性能を達成できるよう基材屈折率の波長依存特性や、適用した化合物(S)および化合物(A)の吸収特性に合わせて光学薄膜設計ソフト(Essential Macleod、Thin Film Center社製)を用いて最適化を行った。最適化を行う際、本実施例においてはソフトへの入力パラメーター(Target値)を下記表3の通りとした。
実施例1において、化合物(s-11)0.02部の代わりに上記表1に記載の化合物(s-27)(ジクロロメタン中での吸収極大波長868nm)0.005部を用いたこと、ならびに、化合物(A)として、下記式(a-3)で表わされる化合物(a-3)(ジクロロメタン中での吸収極大波長703nm)0.03部および下記式(a-4)で表わされる化合物(a-4)(ジクロロメタン中での吸収極大波長736nm)0.07部を用いたこと以外は、実施例1と同様の手順および条件で化合物(S)および化合物(A)を含む透明樹脂製基板からなる基材を得た。この基材の分光透過率を測定し、(Ta)、(Tb)および(Xc)を求めた。結果を図8および表5に示す。
実施例3では、両面に樹脂層を有する透明樹脂製基板からなる基材を有する光学フィルターを以下の手順および条件で作成した。
実施例4では、両面に化合物(S)および化合物(A)を含む透明樹脂層を有する樹脂製基板からなる基材を有する光学フィルターを以下の手順および条件で作成した。
実施例5では、片面に化合物(S)および化合物(A)を含む透明樹脂層を有する透明ガラス基板からなる基材を有する光学フィルターを以下の手順および条件で作成した。
樹脂、溶媒、樹脂製基板の乾燥条件、化合物(S)および化合物(A)を表5に示すように変更したこと以外は、実施例3と同様にして、基材および光学フィルターを作成した。得られた基材および光学フィルターの光学特性を表5に示す。
実施例1において、化合物(S)および化合物(A)を用いなかったこと以外は実施例1と同様にして基材および光学フィルターを作成した。得られた基材および光学フィルターの光学特性を表5に示す。
化合物(S)を用いなかったこと、ならびに、化合物(A)として化合物(a-1)0.03部および化合物(a-2)0.03部を用いたこと以外は実施例3と同様にして、基材および光学フィルターを作成した。得られた基材および光学フィルターの光学特性を表5に示す。
基材として透明ガラス基板「OA-10G(厚み200um)」(日本電気硝子(株)製)を用いたこと以外は、実施例1と同様に光学フィルターを作成した。基材および得られた光学フィルターの光学特性を表5に示す。
<基材の形態>
形態(1):化合物(S)および化合物(A)を含む透明樹脂製基板
形態(2):化合物(S)および化合物(A)を含む透明樹脂製基板の両面に樹脂層を有する
形態(3):樹脂製基板の両面に化合物(S)および化合物(A)を含む透明樹脂層を有する
形態(4):ガラス基板の片方の面に化合物(S)および化合物(A)を含む透明樹脂層を有する
形態(5):化合物(S)および化合物(A)を含まない透明樹脂製基板(比較例)
形態(6):化合物(A)を含む透明樹脂製基板の両面に樹脂層を有する(比較例)
形態(7):ガラス基板(比較例)
樹脂A:環状オレフィン系樹脂(樹脂合成例1)
樹脂B:芳香族ポリエーテル系樹脂(樹脂合成例2)
樹脂C:ポリイミド系樹脂(樹脂合成例3)
樹脂D:環状オレフィン系樹脂「ゼオノア 1420R」(日本ゼオン(株)製)
ガラス基板(1):縦60mm、横60mmの大きさにカットした透明ガラス基板「OA-10G(厚み200μm)」(日本電気硝子(株)製)
<化合物(A)>
化合物(a-1):上記の化合物(a-1)(ジクロロメタン中での吸収極大波長698nm)
化合物(a-2):上記の化合物(a-2)(ジクロロメタン中での吸収極大波長733nm)
化合物(a-3):上記の化合物(a-3)(ジクロロメタン中での吸収極大波長703nm)
化合物(a-4):上記の化合物(a-4)(ジクロロメタン中での吸収極大波長736nm)
化合物(a-5):下記式(a-5)で表されるシアニン系化合物(ジクロロメタン中での吸収極大波長681nm)
溶媒(1):塩化メチレン
溶媒(2):N,N-ジメチルアセトアミド
溶媒(3):シクロヘキサン/キシレン(重量比:7/3)
<フィルム乾燥条件>
条件(1):20℃/8hr→減圧下 100℃/8hr
条件(2):60℃/8hr→80℃/8hr→減圧下 140℃/8hr
条件(3):60℃/8hr→80℃/8hr→減圧下 100℃/24hr
2:分光光度計
3:光
4:レンズ
5:固体撮像素子
6:多重反射光
7:反射ミラー
8:誘電体多層膜
9:蒸着モニター用ガラス(裏面を反射防止膜処理)
10:基材(i)
11:第一光学層
12:第二光学層
13:第三光学層
14:第四光学層
Claims (11)
- 基材と該基材の少なくとも一方の面に誘電体多層膜とを有し、
該基材が、波長600nm以上750nm未満に吸収極大を有する化合物(A)と、波長750nm以上1050nm以下に吸収極大を有する化合物(S)とを含む透明樹脂層を有し、または、前記化合物(A)を含む透明樹脂層および前記化合物(S)を含む透明樹脂層を有し、
下記要件(a)を満たすことを特徴とする光学フィルター:
(a)波長800~1000nmの領域において、光学フィルターの垂直方向から測定した場合の透過率の平均値が5%以下である。 - さらに下記要件(b)を満たすことを特徴とする請求項1に記載の光学フィルター:
(b)波長430~580nmの領域において、光学フィルターの垂直方向から測定した場合の透過率の平均値が75%以上である。 - 前記化合物(S)が、スクアリリウム系化合物、シアニン系化合物、ピロロピロール系化合物および金属ジチオラート系化合物からなる群より選ばれる少なくとも1種であることを特徴とする、請求項1または2に記載の光学フィルター。
- 前記化合物(S)が下記式(Z)で表されるスクアリリウム系化合物であることを特徴とする、請求項1~3のいずれか1項に記載の光学フィルター。
[式(Z)中、置換ユニットAおよびBは、それぞれ独立に下記式(I)および(II)で表される置換ユニットのいずれかを表す。]
[式(I)および(II)中、波線で表した部分が中央四員環との結合部位を表し、
Xは、独立に酸素原子、硫黄原子、セレン原子、テルル原子または-NR8-を表し、
R1~R8は、それぞれ独立に水素原子、ハロゲン原子、スルホ基、水酸基、シアノ基、ニトロ基、カルボキシ基、リン酸基、-NRgRh基、-SRi基、-SO2Ri基、-OSO2Ri基または下記La~Lhのいずれかを表し、RgおよびRhは、それぞれ独立に水素原子、-C(O)Ri基または下記La~Leのいずれかを表し、Riは下記La~Leのいずれかを表し、
(La)炭素数1~12の脂肪族炭化水素基
(Lb)炭素数1~12のハロゲン置換アルキル基
(Lc)炭素数3~14の脂環式炭化水素基
(Ld)炭素数6~14の芳香族炭化水素基
(Le)炭素数3~14の複素環基
(Lf)炭素数1~12のアルコキシ基
(Lg)置換基Lを有してもよい炭素数1~12のアシル基、
(Lh)置換基Lを有してもよい炭素数1~12のアルコキシカルボニル基
置換基Lは、炭素数1~12の脂肪族炭化水素基、炭素数1~12のハロゲン置換アルキル基、炭素数3~14の脂環式炭化水素基、炭素数6~14の芳香族炭化水素基および炭素数3~14の複素環基からなる群より選ばれる少なくとも1種である。] - 基材の両面に誘電体多層膜を有することを特徴とする請求項1~4のいずれか1項に記載の光学フィルター。
- 前記化合物(A)がスクアリリウム系化合物、フタロシアニン系化合物およびシアニン系化合物からなる群より選ばれる少なくとも1種の化合物であることを特徴とする請求項1~5のいずれか1項に記載の光学フィルター。
- 前記透明樹脂が、環状(ポリ)オレフィン系樹脂、芳香族ポリエーテル系樹脂、ポリイミド系樹脂、フルオレンポリカーボネート系樹脂、フルオレンポリエステル系樹脂、ポリカーボネート系樹脂、ポリアミド系樹脂、ポリアリレート系樹脂、ポリサルホン系樹脂、ポリエーテルサルホン系樹脂、ポリパラフェニレン系樹脂、ポリアミドイミド系樹脂、ポリエチレンナフタレート系樹脂、フッ素化芳香族ポリマー系樹脂、(変性)アクリル系樹脂、エポキシ系樹脂、アリルエステル系硬化型樹脂、シルセスキオキサン系紫外線硬化型樹脂、アクリル系紫外線硬化型樹脂およびビニル系紫外線硬化型樹脂からなる群より選ばれる少なくとも1種の樹脂であることを特徴とする請求項1~6のいずれか1項に記載の光学フィルター。
- 前記基材が、化合物(A)および化合物(S)を含む透明樹脂製基板を含有することを特徴とする請求項1~7のいずれか1項に記載の光学フィルター。
- 固体撮像装置用である請求項1~8のいずれか1項に記載の光学フィルター。
- 請求項1~8のいずれか1項に記載の光学フィルターを具備する固体撮像装置。
- 請求項1~8のいずれか1項に記載の光学フィルターを具備するカメラモジュール。
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| JP (1) | JP6627864B2 (ja) |
| KR (1) | KR102547262B1 (ja) |
| CN (1) | CN107407754B (ja) |
| TW (2) | TWI696003B (ja) |
| WO (1) | WO2016158461A1 (ja) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102547262B1 (ko) | 2023-06-22 |
| KR20170131559A (ko) | 2017-11-29 |
| JP6627864B2 (ja) | 2020-01-08 |
| JPWO2016158461A1 (ja) | 2018-02-01 |
| CN107407754B (zh) | 2020-02-07 |
| TW201944103A (zh) | 2019-11-16 |
| TW201702643A (zh) | 2017-01-16 |
| TWI696003B (zh) | 2020-06-11 |
| TWI676051B (zh) | 2019-11-01 |
| CN107407754A (zh) | 2017-11-28 |
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