WO2013161492A1 - 波長カットフィルタ - Google Patents
波長カットフィルタ Download PDFInfo
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- WO2013161492A1 WO2013161492A1 PCT/JP2013/058986 JP2013058986W WO2013161492A1 WO 2013161492 A1 WO2013161492 A1 WO 2013161492A1 JP 2013058986 W JP2013058986 W JP 2013058986W WO 2013161492 A1 WO2013161492 A1 WO 2013161492A1
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- cut filter
- wavelength
- group
- wavelength cut
- compounds
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
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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
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
Definitions
- the present invention relates to a wavelength cut filter formed by laminating a coating layer containing a dye, a glass substrate, and an infrared reflecting film.
- the sensitivity of solid-state image sensors ranges from the ultraviolet region to the infrared region of the wavelength of light.
- human visibility is only in the visible region of the wavelength of light. Therefore, by providing an infrared cut filter between the imaging lens and the solid-state imaging device, the sensitivity of the solid-state imaging device is corrected so as to approach human visibility (see, for example, Patent Documents 1 to 3). .
- an infrared cut filter is a reflection type filter using a combination of layers containing substances having no absorption characteristics and laminated in multiple layers and utilizing the difference in refractive index, or a light absorber is contained in a transparent substrate, or It was a combined absorption filter.
- Reflective filters have problems such as changes in color between the center and the periphery of the screen because the characteristics change depending on the incident angle of light. In addition, the reflected light becomes stray light in the optical path, leading to a problem that causes a reduction in resolution, image spots, unevenness, multiple images called ghosts, and the like.
- the absorption type filter does not change the characteristics depending on the incident angle of light, it needs a considerable thickness in order to obtain the desired characteristics.
- an object of the present invention is to provide a wavelength cut filter that has low incidence angle dependency, high heat resistance, and can be thinned.
- the inventor has a coating layer (B) containing a dye on one surface of the glass substrate (A), and an infrared reflective film (on the other surface of the glass substrate (A)).
- the present inventors have found that a wavelength cut filter characterized by being formed by laminating C) has low incident angle dependency, and has reached the present invention.
- the present invention has a coating layer (B) containing a dye on one surface of a glass substrate (A) and an infrared reflective film (C) laminated on the other surface of the glass substrate (A).
- the wavelength cut filter characterized by this is provided.
- the present invention also provides a solid-state imaging device comprising the wavelength cut filter.
- the present invention also provides a camera module having the wavelength cut filter.
- the wavelength cut filter of the present invention is excellent in that the incident angle dependency is low.
- the wavelength cut filter of the present invention is suitable for a solid-state imaging device and a camera module.
- wavelength cut filter of the present invention will be described based on preferred embodiments.
- the wavelength cut filter of the present invention has a coating layer (B) containing a dye on one surface of a glass substrate (A), and an infrared ray on the other surface of the glass substrate (A).
- the layer structure is formed by laminating the reflective film (C), and the side having the coating layer (B) is the light incident side.
- each layer will be described in order.
- the glass substrate (A) used for the wavelength cut filter of the present invention can be used by appropriately selecting from a glass material transparent in the visible range, but soda lime glass, white plate glass, borosilicate glass, tempered glass, Quartz glass, phosphate glass, and the like can be used. Among them, soda lime glass is preferable because it is inexpensive and easily available, and white plate glass, borosilicate glass, and tempered glass are easily available and have high hardness and high workability. It is preferable because it is excellent.
- the coating liquid is applied to form a coating layer (B) containing a dye described later, and then the dye after drying the coating liquid Adhesiveness to the glass substrate of the coating layer (B) containing bismuth increases.
- silane coupling agent examples include epoxy-functional alkoxysilanes such as ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropylmethyldiethoxysilane, and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane.
- Amino-functional alkoxysilanes such as N- ⁇ (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, N-phenyl- ⁇ -aminopropyltrimethoxysilane, ⁇ -mercaptopropyltrimethoxy Examples include mercapto functional alkoxysilanes such as silane.
- the thickness of the glass substrate (A) is not particularly limited, but is preferably 0.05 to 8 mm, and more preferably 0.05 to 1 mm from the viewpoint of weight reduction and strength.
- the substrate is a glass plate, it can be directly coated on the substrate, dried and then cut, and the structure and process are simplified. Moreover, since a board
- substrate is a glass plate, heat resistance (260 degreeC reflow tolerance) is higher than the case where it is a plastic.
- the coating layer (B) containing a dye used in the wavelength cut filter of the present invention is prepared by dissolving or dispersing a dye, a resin, and other components to be blended as necessary in a suitable solvent to prepare a coating solution. It can form by apply
- Application methods include spin coating, dip coating, spray coating, bead coating, air knife coating, curtain coating, roller coating, wire bar coating, gravure coating, die coating, and hopper. Examples include the extrusion coating method.
- the dye is not particularly limited, and known dyes can be used.
- oxazole and oxadiazole compounds coumarin compounds, quinolinol compounds, phthalocyanine compounds, naphtholactam compounds, fluorenes and derivatives thereof, anthracene and derivatives thereof, xanthene compounds ( (Pyronine, rhodamine, fluorescein), stilbene compounds, cyanine compounds, azo compounds, azomethine compounds, indigo compounds, thioindigo compounds, oxonol compounds, squarylium compounds, indole compounds, styryl compounds, porphine compounds, azurenium compounds, croconic methine compounds , Pyrylium compounds, thiopyrylium compounds, triarylmethane compounds, diphenylmethane compounds, tetrahydrocholine compounds, And phenol compounds, anthraquinone compounds, naphthoquinone compounds, thiazin
- acidic dyes such as xanthene compounds, phthalocyanine compounds, cyanine compounds, azo compounds, oxonol compounds, and anthraquinone compounds are preferable from the viewpoint of solubility.
- acid dyes a cyanine compound is more preferable from the viewpoint of ease of synthesis and molecular design.
- Examples of the cyanine compound include those represented by the following general formula (1).
- A represents a group selected from (a) to (m) of the following group I
- a ′ represents a group selected from (a ′) to (m ′) of the following group II
- Q represents a methine chain having 1 to 9 carbon atoms, and represents a linking group that may contain a ring structure in the chain, and the hydrogen atom in the methine chain is a hydroxyl group, a halogen atom, a cyano group, —NRR ′, aryl Group, an arylalkyl group or an alkyl group, and the —NRR ′, aryl group, arylalkyl group and alkyl group may be further substituted with a hydroxyl group, a halogen atom, a cyano group or —NRR ′.
- R and R ′ represent an aryl group, an arylalkyl group or an alkyl group, An q ⁇ represents a q-valent anion, q represents 1 or 2, and p represents a coefficient for keeping the charge neutral.
- R 1 and R 1 ′ are a hydroxyl group, a halogen atom, a nitro group, a cyano group, —SO 3 H, a carboxyl group, an amino group, an amide group, a ferrocenyl group, an aryl group having 6 to 30 carbon atoms, or a carbon atom number of 7 Represents an arylalkyl group of ⁇ 30 or an alkyl group of 1 to 8 carbon atoms,
- the aryl group having 6 to 30 carbon atoms, the arylalkyl group having 7 to 30 carbon atoms and the alkyl group having 1 to 8 carbon atoms in the above R 1 and R 1 ′ are a hydroxyl group, a halogen atom, a nitro group, a cyano group
- R 2 to R 9 and R 2 ′ to R 9 ′ represent the same group or hydrogen atom as R 1 and R 1 ′
- X and X ′ represent an oxygen atom, a sulfur atom, a selenium atom, —CR 51 R 52 —, a cycloalkane-1,1-diyl group having 3 to 6 carbon atoms, —NH— or —NY 2 —
- R 51 and R 52 represent the same group or hydrogen atom as R 1 and R 1 ′
- Y, Y ′ and Y 2 are each a hydrogen atom, or a hydroxyl group, a halogen atom, a cyano group, a carboxyl group, an amino group, an amide group, a ferrocenyl group, —SO 3 H or a nitro group, which may be substituted with 1 carbon atom.
- the methylene group in the alkyl group having 1 to 8 carbon atoms, the aryl group having 6 to 30 carbon atoms and the arylalkyl group having 7 to 30 carbon atoms in the above Y, Y ′ and Y 2 is —O—, Even when interrupted by —S—, —CO—, —COO—, —OCO—, —SO 2 —, —NH—, —CONH—, —NHCO—, —N ⁇ CH— or —CH ⁇ CH—.
- r and r ′ are 0 or (a) to (e), (g) to (j), (l), (m), (a ′) to (e ′), (g ′) to (j ′) ), (L ′) and (m ′) represent the number that can be substituted. )
- Examples of the halogen atom represented by R 51 and R 52 in R 1 to R 9 and R 1 ′ to R 9 ′ and X and X ′ in the general formula (1) include fluorine, chlorine, bromine and iodine.
- Examples of the aryl group having 6 to 30 carbon atoms include phenyl, naphthyl, 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, 4-vinylphenyl, 3-iso-propylphenyl, 4-iso-propylphenyl, 4-butylphenyl, 4-iso-butylphenyl, 4-tert-butylphenyl, 4-hexylphenyl, 4-cyclohexylphenyl, 4-octylphenyl, 4- (2-ethylhexyl) phenyl, 4-stearylphenyl, 2, 3-dimethylphenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 2,6-
- Examples of the alkyl group having 1 to 8 carbon atoms include methyl, ethyl, propyl, iso-propyl, butyl, sec-butyl, tert-butyl, iso-butyl, amyl, iso-amyl, tert-amyl, hexyl, 2- Examples include hexyl, 3-hexyl, cyclohexyl, 1-methylcyclohexyl, heptyl, 2-heptyl, 3-heptyl, iso-heptyl, tert-heptyl, 1-octyl, iso-octyl, tert-octyl and the like.
- the aryl group having 6 to 30 carbon atoms, the arylalkyl group having 7 to 30 carbon atoms and the alkyl group having 1 to 8 carbon atoms are a hydroxyl group, a halogen atom, a nitro group, a cyano group, —SO 3 H, carboxyl Group, amino group, amido group or ferrocenyl group, which may be substituted, —O—, —S—, —CO—, —COO—, —OCO—, —SO 2 —, —NH—, —CONH— , —NHCO—, —N ⁇ CH— or —CH ⁇ CH—, and the number and position of these substitutions and interruptions are arbitrary.
- examples of the group in which the alkyl group having 1 to 8 carbon atoms is substituted with a halogen atom include chloromethyl, dichloromethyl, trichloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl, nonafluorobutyl and the like.
- Examples of the group in which the alkyl group having 1 to 8 carbon atoms is interrupted by —O— include methyloxy, ethyloxy, iso-propyloxy, propyloxy, butyloxy, pentyloxy, iso-pentyloxy, hexyloxy, heptyl Alkoxy groups such as oxy, octyloxy, 2-ethylhexyloxy, 2-methoxyethyl, 2- (2-methoxy) ethoxyethyl, 2-ethoxyethyl, 2-butoxyethyl, 4-methoxybutyl, 3-methoxybutyl, etc.
- alkoxyalkyl group of Examples of the group in which the alkyl group having 1 to 8 carbon atoms is substituted with a halogen atom and interrupted by —O— include, for example, chloromethyloxy, dichloromethyloxy, trichloromethyloxy, fluoromethyloxy, difluoromethyloxy , Trifluoromethyloxy, nonafluorobutyloxy and the like.
- the cycloalkane-1,1-diyl group having 3 to 6 carbon atoms represented by X and X ′ is cyclopropane-1,1-diyl, cyclobutane-1,1- Examples thereof include diyl, 2,4-dimethylcyclobutane-1,1-diyl, 3,3-dimethylcyclobutane-1,1-diyl, cyclopentane-1,1-diyl, cyclohexane-1,1-diyl and the like.
- a halogen atom represented by Y, Y ′ and Y 2 an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms and an aryl having 7 to 30 carbon atoms
- alkyl group examples include groups exemplified in the description of R 1 and the like.
- the hydrogen atom in these substituents is a hydroxyl group, a halogen atom, a cyano group, a carboxyl group, an amino group, an amide group, a ferrocenyl group,- Any number of SO 3 H or nitro groups may be substituted.
- alkyl group, the aryl group and the methylene group in the arylalkyl group in Y, Y ′, and Y 2 are —O—, —S—, —CO—, —COO—, —OCO—, —SO. It may be interrupted with 2 —, —NH—, —CONH—, —NHCO—, —N ⁇ CH— or —CH ⁇ CH—.
- ether bonds are interrupted by ether bonds, thioether bonds, etc.
- ether bonds such as 2-methoxye 3-methoxypropyl, 4-methoxybutyl, 2-butoxyethyl, methoxyethoxyethyl, methoxyethoxyethoxyethyl, 3-methoxybutyl, 2-phenoxyethyl, 3-phenoxypropyl, 2-methylthioethyl, 2-phenylthio And ethyl.
- Examples of the linking group constituting the methine chain having 1 to 9 carbon atoms represented by Q in the general formula (1) and including a ring structure in the chain include the following (Q-1) to (Q-11):
- the group represented by any of the above is preferable because it is easy to produce.
- the number of carbon atoms in the methine chain having 1 to 9 carbon atoms is the carbon atom of the methine chain or a group that further substitutes the ring structure contained in the methine chain (for example, linking groups (Q-1) to (Q-11). ), Carbon atoms at both ends in Z), or when Z 14 or R 14 to R 19 contain a carbon atom, are not included.
- R 14 , R 15 , R 16 , R 17 , R 18 , R 19 and Z ′ are each independently a hydrogen atom, a hydroxyl group, a halogen atom, a cyano group, —NRR ′, an aryl group, an arylalkyl
- the —NRR ′, aryl group, arylalkyl group and alkyl group may be substituted with a hydroxyl group, a halogen atom, a cyano group or —NRR ′, and —O—, —S—, May be interrupted by —CO—, —COO—, —OCO—, —SO 2 —, —NH—, —CONH—, —NHCO—, —N ⁇ CH— or —CH ⁇ CH—, R and R ′ represent an aryl group, an arylalkyl group or an alkyl group.
- Examples of the halogen atom, aryl group, arylalkyl or alkyl group represented by R 14 , R 15 , R 16 , R 17 , R 18 , R 19 and Z ′ include those exemplified in the description of R 1 and the like.
- Examples of the aryl group, arylalkyl group or alkyl group represented by R and R ′ those exemplified in the description of R 1 and the like can be mentioned.
- Examples of the q-valent anion represented by pAn q- in the general formula (1) include methanesulfonate anion, dodecylsulfonate anion, benzenesulfonate anion, toluenesulfonate anion, trifluoromethanesulfonate anion, naphthalenesulfone. Acid anion, diphenylamine-4-sulfonate anion, 2-amino-4-methyl-5-chlorobenzenesulfonate anion, 2-amino-5-nitrobenzenesulfonate anion, JP-A-10-235999, JP-A-10-337959, Japanese Laid-Open Patent Publication No.
- cyanine compound used in the present invention include the following compound No. 1-102. In the following examples, cyanine cations without anions are shown.
- the production method of the cyanine compound is not particularly limited, and can be obtained by a method using a well-known general reaction.
- a compound having a corresponding structure such as a route described in JP2010-209191A And a method of synthesis by reaction with an imine derivative.
- the dye used in the present invention preferably has a maximum absorption wavelength ( ⁇ max) of the coating film of 650 to 1200 nm, and more preferably 650 to 900 nm.
- ⁇ max maximum absorption wavelength of the coating film
- the maximum absorption wavelength ( ⁇ max) of the coating film is 1200 nm or more of the present invention, the effect of the present invention is not exhibited, and when it is less than 650 nm, visible light is absorbed.
- the content of the dye is single or a total of a plurality of types, preferably 0.01 to 50% by mass, more preferably 0.1%. ⁇ 30% by mass. When the content of the dye is less than 0.01% by mass, sufficient characteristics may not be obtained. When the content is more than 50% by mass, the dye may precipitate in the coating layer.
- the content of the dye alone or in total of a plurality of types is preferably 0.01 to 10.0 parts by mass with respect to 100 parts by mass of the resin solid content, More preferably, it is 0.25 to 5.0 parts by mass.
- the resin examples include natural polymer materials such as gelatin, casein, starch, cellulose derivatives, and alginic acid, or polymethyl methacrylate, polyvinyl butyral, polyvinyl pyrrolidone, polyvinyl alcohol, polyvinyl chloride, styrene-butadiene copolymer, polystyrene, Synthetic polymer materials such as polycarbonate and polyamide are used.
- natural polymer materials such as gelatin, casein, starch, cellulose derivatives, and alginic acid, or polymethyl methacrylate
- polyvinyl butyral polyvinyl pyrrolidone
- polyvinyl alcohol polyvinyl chloride
- styrene-butadiene copolymer polystyrene
- Synthetic polymer materials such as polycarbonate and polyamide are used.
- benzotriazole, triazine, and benzoate UV absorbers include benzotriazole, triazine, and benzoate UV absorbers; phenol, phosphorus, and sulfur antioxidants; cationic surfactants and anionic surfactants Agents, nonionic surfactants, amphoteric surfactants, etc .; halogen compounds, phosphate ester compounds, phosphate amide compounds, melamine compounds, fluororesins or metal oxides, (poly) phosphorus Flame retardants such as melamine acid, piperazine phosphate (poly); hydrocarbon-based, fatty acid-based, aliphatic alcohol-based, aliphatic ester-based, aliphatic amide-based or metal soap-based lubricants; fumed silica, fine particle silica, silica Stone, diatomaceous earth, clay, kaolin, diatomaceous earth, silica gel, calcium silicate, sericite, kaolinite, flint, feldspar
- the solvent is not particularly limited and various known solvents can be used as appropriate. Examples thereof include alcohols such as isopropanol; ether alcohols such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, and butyl diglycol; acetone, Ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and diacetone alcohol; esters such as ethyl acetate, butyl acetate and methoxyethyl acetate; acrylic acid esters such as ethyl acrylate and butyl acrylate; Fluorinated alcohols such as 3-tetrafluoropropanol; hydrocarbons such as hexane, benzene, toluene, xylene; chlorinated hydrocarbons such as methylene dichloride, dichloroethane, and chloroform. These organic solvents can be used alone or in combination.
- the thickness of the coating layer (B) containing the dye is preferably 1 to 200 ⁇ m because a uniform film can be obtained and it is advantageous for thinning. If the thickness is less than 1 ⁇ m, the function cannot be sufficiently exhibited, and if it exceeds 200 ⁇ m, the solvent may remain during coating.
- the infrared reflective film (C) used in the cut filter of the present invention has a function of blocking light in a wavelength region of 700 to 1200 nm, and a low refractive index layer and a high refractive index layer are alternately laminated. It is formed of a dielectric multilayer film.
- a material constituting the low refractive index layer a material having a refractive index of 1.2 to 1.6 can be used.
- silica, alumina, lanthanum fluoride, magnesium fluoride, aluminum hexafluoride sodium, etc. can be mentioned.
- a material having a refractive index of 1.7 to 2.5 can be used as the material constituting the high refractive index layer.
- the method for laminating the low refractive index layer and the high refractive index layer is not particularly limited as long as a dielectric multilayer film in which these layers are laminated is formed.
- a CVD method a sputtering method on a glass substrate.
- the number of laminated layers is 10 to 80, and 25 to 50 is preferable from the viewpoint of process and strength.
- the thickness of the low refractive index layer and the high refractive index layer is usually 1/10 to 1/2 of the wavelength ⁇ (nm) of the light beam to be blocked.
- the thickness is less than 0.1 ⁇ or greater than 0.5 ⁇ , the product (nd) of the refractive index (n) and the physical film thickness (d) is significantly different from the optical film thickness expressed as a multiple of ⁇ / 4. There is a risk that the wavelength cannot be blocked or transmitted.
- the infrared reflective film (C) in addition to the above dielectric multilayer film, a film containing a dye having a maximum absorption wavelength of 700 to 1100 nm, a film in which a polymer is laminated, or a film formed by applying a cholesteric liquid crystal
- a film containing a dye having a maximum absorption wavelength of 700 to 1100 nm, a film in which a polymer is laminated, or a film formed by applying a cholesteric liquid crystal The thing using organic materials, such as these, can also be used.
- the wavelength cut filter of the present invention preferably has a transmittance satisfying the following (i) to (iii).
- the upper transmittance was measured with an ultraviolet-visible near-infrared spectrophotometer V-570 manufactured by JASCO Corporation.
- V-570 ultraviolet-visible near-infrared spectrophotometer manufactured by JASCO Corporation.
- the average transmittance when measured from the vertical direction of the wavelength cut filter is 75% or more.
- the average transmittance when measured from the vertical direction of the wavelength cut filter is 5% or less.
- the wavelength value (Ya) at which the transmittance is 80% when measured from the vertical direction of the wavelength cut filter, and an angle of 35 ° with respect to the vertical direction of the wavelength cut filter The absolute value of the difference in wavelength value (Yb) at which the transmittance is 80% when measured from is 30 nm or less.
- the wavelength cut filter if the average value of the transmittance in the wavelength range of 430 to 580 nm of (i) is less than 75%, light in the visible light region is hardly transmitted, and the wavelength 800 of (ii) above.
- a heat ray cut filter mounted on a window glass of an automobile or a building; a digital still camera, a digital video camera, a surveillance camera, an in-vehicle camera, a web camera, a mobile phone
- a solid-state imaging device such as a CCD or CMOS
- a solid-state imaging device such as a camera
- an automatic exposure meter a display device
- a plasma display such as a plasma display.
- the solid-state imaging device of the present invention is configured in the same manner as a conventionally known solid-state imaging device except that the wavelength cut filter of the present invention is provided on the front surface of the imaging element.
- the wavelength cut filter 1 of the present invention may be fixed to a part other than the solid-state image sensor on the light incident side of the solid-state image sensor 2, or as shown in FIG. It may be fixed directly to the front of the.
- an optical low-pass filter In the solid-state imaging device of the present invention, an optical low-pass filter, an antireflection filter, a color filter, and the like can be arranged as necessary, and the order of stacking these is not particularly limited.
- FIG. 2 is a cross-sectional view showing an embodiment of the configuration of a camera module that is one of the solid-state imaging devices of the present invention.
- the camera module includes a solid-state imaging device 2 formed in a rectangular shape in plan view on a semiconductor substrate, and a coating layer (B) / glass substrate containing a dye from the light incident side on the opposite side of the light-receiving unit 3 of the solid-state imaging device 2 (A)
- the wavelength cut filter 1 laminated in the order of the infrared reflective film (C) and the solid-state image sensor 2 are formed in a region excluding the light-receiving unit 3 on one surface, and the solid-state image sensor 2 and the wavelength cut filter 1 are bonded.
- a camera module which is a solid-state imaging device, takes in light from the outside through the wavelength cut filter 1 and receives the light with a light-receiving element disposed in the light-receiving unit 3 of the solid-state imaging element 2.
- a UV curable adhesive such as an acrylic resin or an epoxy resin, or a thermosetting resin can be used.
- a known photolithography may be used as necessary.
- the adhesive 4 is patterned using a technique and bonded by thermosetting. When joining, vacuum pressurization may be performed after bonding in a vacuum environment.
- the mounting substrate 8 is a rigid substrate using a glass epoxy substrate, a ceramic substrate, or the like, and is provided with a control circuit for controlling the solid-state imaging device 2.
- the solid-state imaging device 2 is disposed on the mounting substrate 8, and then the adhesive 4 is applied in advance to a position where the lens holder 7 of the mounting substrate 8 is fixed.
- the lens cap 6 protects the lens 5.
- the lens holder 7 holds the lens 5, and is attached to the mounting substrate 8 to cover the solid-state imaging device 2.
- a box-shaped base portion 7 a and a cylindrical lens barrel portion 7 b that holds the lens 5 are provided. It has.
- the lens holder 7 is disposed on the mounting substrate 8 so that the lower end surface of the lens holder 7 is in contact with the applied adhesive 4, and the light receiving unit 3 of the solid-state imaging device 2 and the lens 5 in the lens holder 7 are arranged.
- the position of the lens holder 7 is adjusted such that the distance of the lens 5 coincides with the focal length of the lens 5.
- the adhesive 4 can be irradiated with ultraviolet rays to cure the adhesive 4, and a camera module can be manufactured.
- the entire mounting substrate 8 to which the lens holder 7 is fixed may be heated at about 85 ° C. and the adhesive 4 may be sufficiently cured by thermal curing.
- the camera module manufacturing method includes a step of heating the entire mounting substrate 8 after the step of irradiating ultraviolet rays, the lens holder 7, the lens 5 and the wavelength cut filter 1 are all materials having high heat resistance. Is required. Specifically, in addition to heating for thermosetting the adhesive 4 as described above, a plurality of solders disposed on the lower surface of the mounting substrate 8 are heated and melted at about 260 ° C. to be soldered to other substrates. For this reason, it is desirable that the material is made of a material having reflow resistance.
- Production Examples 1 to 11 show preparation examples of coating solutions for forming the coating layer (B) containing the dye used in the wavelength cut filter of the present invention, and Comparative Production Examples 2 to 4 show comparative wavelengths. Examples of preparation of a comparative coating solution for forming a coating layer (B) containing a dye used for a cut filter are shown. Examples 1 to 11 show examples of production of the wavelength cut filter of the present invention. 1 to 4 show comparative wavelength cut filter manufacturing examples. In evaluation examples 1 to 11, the wavelength cut filters of the present invention manufactured in Examples 1 to 11 were evaluated, and in comparative evaluation examples 1 to 4, comparisons were made. The comparative wavelength cut filters produced in Examples 1-4 were evaluated.
- the wavelength cut filter of Comparative Example 1 having no dye-containing coating layer (B) has a high incident angle dependency and has an infrared reflection film (C).
- the wavelength cut filters of Comparative Examples 2 to 4 have low incident angle dependency, the transmittance is low in the wavelength range of 430 to 580 nm or high in the wavelength range of 800 to 1000 nm, that is, in the visible light region. Since light is not transmitted and light is not cut in the infrared region, the sensitivity cannot be corrected to approach human visibility.
- the wavelength cut filter of the present invention has high transmittance in the wavelength range of 430 to 580 nm, low transmittance in the wavelength range of 800 to 1000 nm, and low incident angle dependency.
- the glass substrate (A) has a coating layer (B) containing a dye on one surface, and the infrared reflection film (C) is laminated on the other surface of the glass substrate (A).
- the wavelength cut filter according to the present invention which is characterized by this, has low incident angle dependency. Therefore, the wavelength cut filter of the present invention is useful for a solid-state imaging device and a camera module.
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Description
本発明の波長カットフィルタに用いられるガラス基板(A)としては、可視域で透明なガラス材料から適宜選択して使用することができるが、ソーダ石灰ガラス、白板ガラス、硼珪酸ガラス、強化ガラス、石英ガラス、リン酸塩系ガラス等を用いることができ、中でも、ソーダ石灰ガラスは、安価で入手容易なため好ましく、白板ガラス、硼珪酸ガラス及び強化ガラスは、入手容易で硬度が高く加工性に優れるため好ましい。
本発明の波長カットフィルタに用いられる染料を含有するコーティング層(B)は、染料、樹脂及び必要に応じて配合される他の成分を適当な溶媒に溶解又は分散させて塗工液を調製し、得られた塗工液をガラス基板(A)上に塗布することにより形成することができる。
塗布方法としては、スピンコート法、ディップコート法、スプレーコート法、ビードコート法、エアーナイフコート法、カーテンコート法、ローラーコート法、ワイヤーバーコート法、グラビアコート法、ダイコート法、ホッパーを使用するエクストルージョンコート法等が挙げられる。
上記酸性染料の中でも、合成の容易さ及び分子設計の点から、シアニン化合物が更に好ましい。
Qは炭素原子数1~9のメチン鎖を構成し、鎖中に環構造を含んでもよい連結基を表し、該メチン鎖中の水素原子は水酸基、ハロゲン原子、シアノ基、-NRR’、アリール基、アリールアルキル基又はアルキル基で置換されていてもよく、該-NRR’、アリール基、アリールアルキル基及びアルキル基は更に水酸基、ハロゲン原子、シアノ基又は-NRR’で置換されていてもよく、-O-、-S-、-CO-、-COO-、-OCO-、-SO2-、-NH-、-CONH-、-NHCO-、-N=CH-又は-CH=CH-で中断されてもよく、
R及びR’は、アリール基、アリールアルキル基又はアルキル基を表し、
Anq-はq価のアニオンを表し、qは1又は2を表し、pは電荷を中性に保つ係数を表す。)
R1及びR1’は、水酸基、ハロゲン原子、ニトロ基、シアノ基、-SO3H、カルボキシル基、アミノ基、アミド基、フェロセニル基、炭素原子数6~30のアリール基、炭素原子数7~30のアリールアルキル基又は炭素原子数1~8のアルキル基を表し、
上記R1及びR1’中の炭素原子数6~30のアリール基、炭素原子数7~30のアリールアルキル基及び炭素原子数1~8のアルキル基は、水酸基、ハロゲン原子、ニトロ基、シアノ基、-SO3H、カルボキシル基、アミノ基、アミド基又はフェロセニル基で置換されていてもよく、-O-、-S-、-CO-、-COO-、-OCO-、-SO2-、-NH-、-CONH-、-NHCO-、-N=CH-又は-CH=CH-で中断されていてもよく、
R2~R9及びR2’~R9’は、R1及びR1’と同様の基又は水素原子を表し、
X及びX’は、酸素原子、硫黄原子、セレン原子、-CR51R52-、炭素原子数3~6のシクロアルカン-1,1-ジイル基、-NH-又は-NY2-を表し、
R51及びR52は、R1及びR1’と同様の基又は水素原子を表し、
Y、Y’及びY2は、水素原子、又は水酸基、ハロゲン原子、シアノ基、カルボキシル基、アミノ基、アミド基、フェロセニル基、-SO3H若しくはニトロ基で置換されてもよい炭素原子数1~20のアルキル基、炭素原子数6~30のアリール基若しくは炭素原子数7~30のアリールアルキル基を表し、
上記Y、Y’及びY2中の炭素原子数1~8のアルキル基、炭素原子数6~30のアリール基及び炭素原子数7~30のアリールアルキル基中のメチレン基は、-O-、-S-、-CO-、-COO-、-OCO-、-SO2-、-NH-、-CONH-、-NHCO-、-N=CH-又は-CH=CH-で中断されていてもよく、
r及びr’は、0又は(a)~(e)、(g)~(j)、(l)、(m)、(a’)~(e’)、(g’)~(j’)、(l’)及び(m’)において置換可能な数を表す。)
炭素原子数6~30のアリール基としては、フェニル、ナフチル、2-メチルフェニル、3-メチルフェニル、4-メチルフェニル、4-ビニルフェニル、3-iso-プロピルフェニル、4-iso-プロピルフェニル、4-ブチルフェニル、4-iso-ブチルフェニル、4-tert-ブチルフェニル、4-ヘキシルフェニル、4-シクロヘキシルフェニル、4-オクチルフェニル、4-(2-エチルヘキシル)フェニル、4-ステアリルフェニル、2,3-ジメチルフェニル、2,4-ジメチルフェニル、2,5-ジメチルフェニル、2,6-ジメチルフェニル、3,4-ジメチルフェニル、3,5-ジメチルフェニル、2,4-ジ-tert-ブチルフェニル、2,5-ジ-tert-ブチルフェニル、2,6-ジ-tert-ブチルフェニル、2,4-ジ-tert-ペンチルフェニル、2,5-ジ-tert-アミルフェニル、2,5-ジ-tert-オクチルフェニル、2,4-ジクミルフェニル、4-シクロヘキシルフェニル、(1,1’-ビフェニル)-4-イル、2,4,5-トリメチルフェニル、フェロセニル等が挙げられ、
炭素原子数7~30のアリールアルキル基としては、ベンジル、フェネチル、2-フェニルプロパン-2-イル、ジフェニルメチル、トリフェニルメチル、スチリル、シンナミル、フェロセニルメチル、フェロセニルプロピル等が挙げられ、
炭素原子数1~8のアルキル基としては、メチル、エチル、プロピル、iso-プロピル、ブチル、sec-ブチル、tert-ブチル、iso-ブチル、アミル、iso-アミル、tert-アミル、ヘキシル、2-ヘキシル、3-ヘキシル、シクロヘキシル、1-メチルシクロヘキシル、ヘプチル、2-ヘプチル、3-ヘプチル、iso-ヘプチル、tert-ヘプチル、1-オクチル、iso-オクチル、tert-オクチル等が挙げられる。
上記炭素原子数6~30のアリール基、炭素原子数7~30のアリールアルキル基及び炭素原子数1~8のアルキル基は、水酸基、ハロゲン原子、ニトロ基、シアノ基、-SO3H、カルボキシル基、アミノ基、アミド基又はフェロセニル基で置換されていてもよく、-O-、-S-、-CO-、-COO-、-OCO-、-SO2-、-NH-、-CONH-、-NHCO-、-N=CH-又は-CH=CH-で中断されてもよく、これらの置換及び中断の数及び位置は任意である。
例えば、上記炭素原子数1~8のアルキル基がハロゲン原子で置換された基としては、例えば、クロロメチル、ジクロロメチル、トリクロロメチル、フルオロメチル、ジフルオロメチル、トリフルオロメチル、ノナフルオロブチル等が挙げられ、
上記炭素原子数1~8のアルキル基が、-O-で中断された基としては、メチルオキシ、エチルオキシ、iso-プロピルオキシ、プロピルオキシ、ブチルオキシ、ペンチルオキシ、iso-ペンチルオキシ、ヘキシルオキシ、ヘプチルオキシ、オクチルオキシ、2-エチルヘキシルオキシ等のアルコキシ基や、2-メトキシエチル、2-(2-メトキシ)エトキシエチル、2-エトキシエチル、2-ブトキシエチル、4-メトキシブチル、3-メトキシブチル等のアルコキシアルキル基等が挙げられ、
上記炭素原子数1~8のアルキル基がハロゲン原子で置換され、且つ-O-で中断された基としては、例えば、クロロメチルオキシ、ジクロロメチルオキシ、トリクロロメチルオキシ、フルオロメチルオキシ、ジフルオロメチルオキシ、トリフルオロメチルオキシ、ノナフルオロブチルオキシ等が挙げられる。
また、これらのY、Y’、Y2中のアルキル基、アリール基及びアリールアルキル基中のメチレン基は、-O-、-S-、-CO-、-COO-、-OCO-、-SO2-、-NH-、-CONH-、-NHCO-、-N=CH-又は-CH=CH-で中断されてもよい。例えば、メチル、エチル、プロピル、iso-プロピル、ブチル、sec-ブチル、tert-ブチル、iso-ブチル、アミル、iso-アミル、tert-アミル、ヘキシル、2-ヘキシル、3-ヘキシル、シクロヘキシル、1-メチルシクロヘキシル、ヘプチル、2-ヘプチル、3-ヘプチル、iso-ヘプチル、tert-ヘプチル、1-オクチル、iso-オクチル、tert-オクチル、2-エチルヘキシル、ノニル、iso-ノニル、デシル、ドデシル、トリデシル、テトラデシル、ペンタデシル、ヘキサデシル、ヘプタデシル、オクタデシル等のアルキル基;フェニル、ナフチル、2-メチルフェニル、3-メチルフェニル、4-メチルフェニル、4-ビニルフェニル、3-iso-プロピルフェニル、4-iso-プロピルフェニル、4-ブチルフェニル、4-iso-ブチルフェニル、4-tert-ブチルフェニル、4-ヘキシルフェニル、4-シクロヘキシルフェニル、4-オクチルフェニル、4-(2-エチルヘキシル)フェニル、4-ステアリルフェニル、2,3-ジメチルフェニル、2,4-ジメチルフェニル、2,5-ジメチルフェニル、2,6-ジメチルフェニル、3,4-ジメチルフェニル、3,5-ジメチルフェニル、2,4-ジ-tert-ブチルフェニル、シクロヘキシルフェニル等のアリール基;ベンジル、フェネチル、2-フェニルプロパン-2-イル、ジフェニルメチル、トリフェニルメチル、スチリル、シンナミル等のアリールアルキル基等が、エーテル結合、チオエーテル結合等で中断されたもの、例えば、2-メトキシエチル、3-メトキシプロピル、4-メトキシブチル、2-ブトキシエチル、メトキシエトキシエチル、メトキシエトキシエトキシエチル、3-メトキシブチル、2-フェノキシエチル、3-フェノキシプロピル、2-メチルチオエチル、2-フェニルチオエチル等が挙げられる。
R及びR’は、アリール基、アリールアルキル基又はアルキル基を表す。)
また、上記染料を含有するコーティング層(B)において、染料の含有量は、単独又は複数種の合計で、樹脂固形分100質量部に対して、好ましくは0.01~10.0質量部、より好ましくは0.25~5.0質量部である。
本発明のカットフィルタに用いられる赤外線反射膜(C)は、700~1200nmの波長域の光を遮断する機能を有するものであり、低屈折率層と高屈折率層とが交互に積層された誘電体多層膜により形成される。
積層数は、10~80層であり、25~50層であるのが、プロセス及び強度の点から好ましい。
(i)波長430~580nmの範囲において、波長カットフィルタ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。
(ii)波長800~1000nmにおいて、波長カットフィルタ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。
(iii)波長560~800nmの範囲において、波長カットフィルタの垂直方向から測定した場合の透過率が80%となる波長の値(Ya)と、波長カットフィルタの垂直方向に対して35°の角度から測定した場合の透過率が80%となる波長の値(Yb)の差の絶対値が30nm以下である。
波長カットフィルターにおいて、上記(i)の波長430~580nmの範囲における透過率の平均値が75%未満であると、可視光領域における光をほとんど透過しないことになり、上記(ii)の波長800~1000nmにおける透過率の平均値が5%を超えると、赤外線領域における光をほとんどカットしないため、人間の視感度に近づくよう感度を補正することが困難になる恐れがある。
また、上記(iii)のYaとYbの差の絶対値が30nmを超えると、光の入射角による依存性が高くなり、光の入射角によって波長カットフィルタの特性が変化するため、画面の中心と周辺で色合いが変化する等の弊害が生じる恐れがある。
本発明の固体撮像装置は、本発明の波長カットフィルタを撮像素子の前面に備える以外は、従来公知の固体撮像装置と同様に構成される。図2に示すように、本発明の波長カットフィルタ1は、固体撮像素子2の光入射側で固体撮像素子以外の部分に固定してもよいし、図3に示すように、固体撮像素子2の前面に直接固定してもよい。
図2は、本発明の固体撮像装置の一つであるカメラモジュールの構成の一形態を示す断面図である。カメラモジュールは、半導体基板に平面視矩形状に形成された固体撮像素子2と、固体撮像素子2の受光部3の反対側に、光入射側から染料を含有するコーティング層(B)・ガラス基板(A)・赤外線反射膜(C)の順に積層された波長カットフィルタ1と、固体撮像素子2の一面において受光部3を除いた領域に形成され、固体撮像素子2及び波長カットフィルタ1を接着剤4で接合する。固体撮像装置であるカメラモジュールは、波長カットフィルタ1を通して外部からの光を取り込み、固体撮像素子2の受光部3に配置された受光素子によって受光する。
実装基板8上に固体撮像素子2を配置し、続いて、実装基板8のレンズホルダ7が固着される位置に予め接着剤4を塗布しておく。
レンズキャップ6は、レンズ5を保護するものである。また、レンズホルダー7は、レンズ5を保持するものであり、実装基板8に取り付けられて固体撮像素子2を覆う箱状のベース部7aと、レンズ5を保持する円筒形状の鏡筒部7bとを備えている。
レンズホルダ7が固定された実装基板8全体を、約85℃ で加熱して、熱硬化により更に接着剤4の硬化を十分に行ってもよい。
料で形成されていることが望ましい。
[表1]及び[表2]に示す配合で各成分を混合し、塗工液No.1~No.11及び比較塗工液No.2~No.4を得た。
厚さ100μmのガラス基板(B)の一方の面に、真空蒸着法によりシリカ(SiO2)層と酸化チタン(TiO2)層とを交互に積層して、全層数が30層で厚さ約3μmの赤外線反射膜(C)を形成した。
得られた赤外反射膜(C)を形成したガラス基板(B)の該赤外反射膜(C)とは異なる面に、製造例1~11で得られた塗工液No.1~No.11を、バーコーター#30により塗布(膜厚10μm)した後、100℃で10分間乾燥させてコーティング層を形成し、本発明の波長カットフィルターNo.1~No.11を作製した。
上記で得られた、赤外反射膜(C)を形成したガラス基板を比較の波長カットフィルタNo.1とした。
また、厚さ100μmのガラス基板(B)の一方の面に、比較塗工液No.2~No.4を、バーコーター#30により塗布(膜厚10μm)した後、100℃で10分間乾燥させてコーティング層(A)を形成し、比較の波長カットフィルタNo.2~No.4を作製した。
実施例1~11で得られた本発明の波長カットフィルタNo.1~No.11及び比較例1~4で得られた比較の波長カットフィルタNo.1~No.4について、i)波長430~580nmの範囲において、波長カットフィルタの垂直方向から測定した場合の透過率の平均値、ii)波長800~1000nmにおいて、波長カットフィルタの垂直方向から測定した場合の透過率の平均値及びiii)波長560~800nmの範囲において、波長カットフィルタの垂直方向から測定した場合の透過率が80%となる波長の値(Ya)と、波長カットフィルタの垂直方向に対して35°の角度から測定した場合の透過率が80%となる波長の値(Yb)の差の絶対値を求めた。結果を[表1]及び[表2]に示す。尚、上透過率の測定は、日本分光(株)製紫外可視近赤外分光光度計V-570で測定した。
一方、本発明の波長カットフィルタは、波長430~580nmの範囲において透過率が高く、波長800~1000nmにおいて透過率が低く、且つ入射角依存性が低い。
(B).コーティング層
(C).赤外線反射膜(蒸着膜)
1.波長カットフィルタ
2.固体撮像素子
3.受光部
4.接着剤
5.レンズ
6.レンズキャップ
7.レンズホルダ
7a.ベース部
7b.鏡筒部
8.実装基板
Claims (7)
- ガラス基板(A)の一方の面に染料を含有するコーティング層(B)を有し、且つガラス基板(A)の他方の面に赤外線反射膜(C)を積層してなることを特徴とする波長カットフィルタ。
- 上記染料が酸性染料であることを特徴とする請求項1記載の波長カットフィルタ。
- 透過率が下記(i)~(iii)を満たすことを特徴とする請求項1又は2記載の波長カットフィルタ。
(i)波長430~580nmの範囲において、波長カットフィルタ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。
(ii)波長800~1000nmにおいて、波長カットフィルタ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。
(iii)波長560~800nmの範囲において、波長カットフィルタの垂直方向から測定した場合の透過率が80%となる波長の値(Ya)と、波長カットフィルタの垂直方向に対して35°の角度から測定した場合の透過率が80%となる波長の値(Yb)の差の絶対値が30nm以下である。 - 上記染料を含有するコーティング層(B)が、樹脂固形分100質量部に対して染料を0.01~10.0質量部含有されてなることを特徴とする請求項1~3の何れか1項に記載の波長カットフィルタ。
- 上記染料がシアニン化合物であることを特徴とする請求項1~4の何れか1項に記載の波長カットフィルタ。
- 請求項1~5の何れか1項に記載の波長カットフィルタを具備することを特徴とする固体撮像装置。
- 請求項1~5の何れか1項に記載の波長カットフィルタを具備することを特徴とするカメラモジュール。
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| JP2015203863A (ja) * | 2014-04-16 | 2015-11-16 | ソニー株式会社 | 撮像素子及び撮像装置 |
| CN105593712A (zh) * | 2013-12-26 | 2016-05-18 | 旭硝子株式会社 | 滤光器 |
| JP2016162946A (ja) * | 2015-03-04 | 2016-09-05 | Jsr株式会社 | 固体撮像装置 |
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| JP2019086771A (ja) * | 2017-11-01 | 2019-06-06 | 三星電子株式会社Samsung Electronics Co.,Ltd. | 光学フィルターとこれを含むカメラモジュール及び電子装置 |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6305331B2 (ja) | 2018-04-04 |
| JPWO2013161492A1 (ja) | 2015-12-24 |
| TW201346350A (zh) | 2013-11-16 |
| CN103930806B (zh) | 2016-11-23 |
| KR101987926B1 (ko) | 2019-06-11 |
| KR20150003712A (ko) | 2015-01-09 |
| TWI634352B (zh) | 2018-09-01 |
| CN103930806A (zh) | 2014-07-16 |
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