WO2016171255A1 - 近赤外線カットフィルタガラス - Google Patents
近赤外線カットフィルタガラス Download PDFInfo
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- WO2016171255A1 WO2016171255A1 PCT/JP2016/062768 JP2016062768W WO2016171255A1 WO 2016171255 A1 WO2016171255 A1 WO 2016171255A1 JP 2016062768 W JP2016062768 W JP 2016062768W WO 2016171255 A1 WO2016171255 A1 WO 2016171255A1
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- WO
- WIPO (PCT)
- Prior art keywords
- glass
- infrared cut
- cut filter
- amount
- filter glass
- Prior art date
Links
- 239000011521 glass Substances 0.000 title claims abstract description 178
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 7
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 6
- 229910052788 barium Inorganic materials 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 5
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 5
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 238000002834 transmittance Methods 0.000 claims description 39
- 230000008033 biological extinction Effects 0.000 claims description 25
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 20
- 230000000694 effects Effects 0.000 description 16
- 238000002844 melting Methods 0.000 description 15
- 230000008018 melting Effects 0.000 description 15
- 239000000203 mixture Substances 0.000 description 11
- 230000001965 increasing effect Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 229910052697 platinum Inorganic materials 0.000 description 10
- 238000003384 imaging method Methods 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 8
- 230000000087 stabilizing effect Effects 0.000 description 8
- 238000004448 titration Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000003595 spectral effect Effects 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- -1 nitrate compound Chemical class 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000006060 molten glass Substances 0.000 description 4
- 230000033116 oxidation-reduction process Effects 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000000156 glass melt Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000005365 phosphate glass Substances 0.000 description 3
- 229910013553 LiNO Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 206010040925 Skin striae Diseases 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001444 catalytic combustion detection Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/19—Silica-free oxide glass compositions containing phosphorus containing boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/16—Silica-free oxide glass compositions containing phosphorus
- C03C3/17—Silica-free oxide glass compositions containing phosphorus containing aluminium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/08—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths
- C03C4/082—Compositions for glass with special properties for glass selectively absorbing radiation of specified wave lengths for infrared absorbing glass
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/226—Glass filters
Definitions
- the present invention relates to a near-infrared cut filter glass that is used in color correction filters for digital still cameras, color video cameras, and the like, and that is particularly excellent in light transmittance and intensity in the visible range.
- Solid-state imaging devices such as CCDs and CMOSs used for digital still cameras have spectral sensitivity ranging from the visible region to the near infrared region around 1200 nm. Therefore, since the solid-state imaging device cannot obtain good color reproducibility as it is, the near-infrared cut filter glass to which a specific substance that absorbs infrared rays is added is used to correct the visibility of the solid-state imaging device. .
- the near-infrared cut filter glass an optical glass in which Cu is added to a phosphate glass so as to selectively absorb light having a wavelength in the near-infrared region and to have high weather resistance has been developed and used. ing.
- the composition of these glasses is disclosed in Patent Document 1.
- the present invention is excellent in optical characteristics with high transmittance of light in the visible region and low transmittance of light in the near-infrared region even when the concentration of the Cu component in the glass increases as the glass becomes thinner, and the thin plate
- An object of the present invention is to provide a near infrared cut filter glass having high strength even if it is converted into a glass.
- the inventors of the present invention have excellent optical characteristics that are unprecedented by strictly controlling the valence of the Cu component in the glass in a composition system that has high strength even when thinned. It has been found that a near-infrared cut filter glass is obtained.
- the near-infrared cut filter glass of the present invention has P, Al, R (R represents one or more components of Li, Na, and K), R ′ (R ′ is Mg, Ca). , Sr, Ba, and Zn.), And a near-infrared cut filter glass containing each component of Cu and substantially free of F, wherein (Cu + amount / The total amount of Cu) ⁇ 100 [%] is 0.01 to 7.0%.
- the near-infrared cut filter glass of the present invention further contains 0 to 10% of B 2 O 3 in terms of mol%.
- the fracture toughness value of the said near-infrared cut filter glass is 0.3 Mpa * m ⁇ 1/2 > or more.
- the numerical value obtained by dividing the extinction coefficient at a wavelength of 430 nm of the near-infrared cut filter glass by the extinction coefficient at a wavelength of 800 nm is 0.00001 to 0.19.
- the transmittance at a wavelength of 430 nm when the near infrared cut filter glass has a thickness of 0.3 mm is 50 to 92%.
- the near-infrared cut filter glass has a P 2 O 5 content of 50 to 75% in terms of mol%.
- Al 2 O 3 5-22% The R 2 O 0.5 ⁇ 20% ( R 2 O is, Li 2 O, represents any one or more substances of Na 2 O, and K 2 O.), 0.1 to 25% of R′O (R′O represents one or more substances of MgO, CaO, SrO, BaO, and ZnO), and 0.1 to 15% of CuO contains.
- the numerical range includes the numerical values described before and after the numerical value as a lower limit value and an upper limit value.
- a near-infrared cut filter glass excellent in optical characteristics having a high visible light transmittance and a low near-infrared light transmittance in a composition system having high strength even when thinned is obtained. be able to.
- the near-infrared cut filter glass of the present invention (hereinafter sometimes referred to as the glass of the present invention) is P, Al, R (where R represents one or more components of Li, Na, and K). That is, R represents one or more alkali metals of Li, Na, and K, and represents that they contain at least one of them.), R ′ (where R ′ is Mg, Ca , Sr, Ba, and Zn, that is, R ′ represents one or more alkaline earth metals of Mg, Ca, Sr, Ba, and Zn, and Containing at least one or more), and Cu components, substantially no F, (Cu + amount / total Cu amount) x 100 [%] is 0.01 -7.0%.
- the Cu + amount is an indication of wt%
- the total Cu amount is an indication of wt% including monovalent, divalent and other valences present.
- the total amount of Cu That is, when the glass of the present invention is 100% by weight, the Cu + amount and the total Cu amount are indicated by the content of Cu + and the total Cu amount as weight% in the glass.
- the Cu component in the glass needs to be present as Cu 2+ (bivalent) in order to absorb light having a wavelength in the near-infrared region.
- the existence ratio of Cu + (monovalent) having absorption characteristics in the vicinity of a wavelength of 300 to 600 nm increases, and the transmittance in the vicinity of a wavelength of 430 nm decreases. Therefore, the ratio of the Cu + amount to the total Cu amount, in other words, (Cu + amount / total Cu amount) ⁇ 100 is set to 0.01 to 7.0%, thereby suppressing the decrease in transmittance near the wavelength of 430 nm.
- light having a wavelength of 700 nm or more can be absorbed.
- the (Cu + amount / total Cu amount) ⁇ 100 of the Cu component in the glass of the present invention is preferably 0.01 to 6.5%, more preferably 0.05 to 6.0%, and more preferably 0.1 to 5%. 0.5% is more preferable, 0.5 to 5.0% is more preferable, and 1.0 to 4.5% is most preferable.
- the Cu + amount can be measured by an oxidation-reduction titration method, and the total Cu amount can be measured by an ICP emission analysis method.
- the method for measuring the amount of Cu + using the oxidation-reduction titration method is as follows.
- Reagents NaVO 3 , HF, and H 2 SO 4 and a glass sample are placed in a container and heated to cause Cu + and VO 3 ⁇ to react 1: 1.
- Cu + is oxidized to Cu 2+
- VO 3 ⁇ is reduced to VO 2 + .
- FeSO 4 as a reagent is added dropwise thereto, Fe 2+ reacts with the remaining VO 3 ⁇ that did not react with Cu + , and VO 3 ⁇ is reduced to VO 2 + .
- the value obtained by dividing the extinction coefficient at a wavelength of 430 nm by the extinction coefficient at a wavelength of 800 nm is preferably in the range of 0.00001 to 0.19.
- the extinction coefficient is a constant indicating how much light the medium absorbs when it enters a certain medium, and has a reciprocal dimension of the length. According to Lambert-Beer's law, the logarithm (absorbance) of the ratio of the intensity of light that has passed through a medium to the intensity of incident light is proportional to the distance of passage, and the proportional coefficient is called the extinction coefficient. . That is, when the extinction coefficient is high, the amount of light that passes through the glass is small, and when the extinction coefficient is low, the amount of light that passes through the glass is large.
- the transmittance of light having a wavelength of 430 nm has a correlation with the content of Cu + in the glass, and the absorption coefficient at a wavelength of 430 nm increases as the content of Cu + increases.
- permeability of the light of wavelength 800nm has correlation with content of Cu2 + in glass, and the absorption coefficient in wavelength 800nm becomes high, so that there is much content of Cu2 + . Therefore, the near infrared cut filter glass preferably has a low extinction coefficient at a wavelength of 430 nm and a high extinction coefficient at a wavelength of 800 nm.
- the absolute value of the extinction coefficient varies depending on the content of the Cu component in the glass.
- the numerical value obtained by dividing the extinction coefficient at a wavelength of 430 nm by the extinction coefficient at a wavelength of 800 nm is within a range of 0.00001 to 0.19, so that the visible region and the near red region can be obtained regardless of the Cu content in the glass A near-infrared cut filter glass having a good balance of light transmission characteristics in the outer region can be obtained.
- the value obtained by dividing the extinction coefficient at a wavelength of 430 nm by the extinction coefficient at a wavelength of 800 nm exceeds 0.19, it is not preferable because the transmittance near the wavelength of 430 nm decreases.
- the said numerical value is less than 0.00001, in order to reduce content of Cu ⁇ +> , it is necessary to strictly control the atmosphere at the time of manufacture of a molten glass, and there exists a possibility that manufacturing cost may become high.
- the numerical value obtained by dividing the extinction coefficient at a wavelength of 430 nm by the extinction coefficient at a wavelength of 800 nm is more preferably 0.00005 to 0.17, further preferably 0.0001 to 0.15, and still more preferably 0.0005 to 0.13. 0.001 to 0.12 is particularly preferable.
- the glass of the present invention preferably has a transmittance at a wavelength of 430 nm in the range of 50 to 92% at a spectral transmittance at a thickness of 0.3 mm. By doing in this way, the glass with the high transmittance
- the transmittance at a wavelength of 430 nm is less than 50% in the spectral transmittance at a thickness of 0.3 mm, the transmittance near the wavelength of 430 nm is too low, and this is not preferable because the color tone is affected when used in an imaging apparatus.
- the transmittance exceeds 92%, it is necessary to strictly control the atmosphere during the production of the molten glass in order to reduce the Cu + content, which may increase the production cost.
- the transmittance at a wavelength of 430 nm is more preferably 60 to 91%, further preferably 65 to 90%.
- the glass of the present invention In mol% 50-75% of P 2 O 5 Al 2 O 3 5-22%, The R 2 O 0.5 ⁇ 20% (provided that, R 2 O represents Li 2 O, Na 2 O, and K 2 any one or more substances O), 0.1 to 25% of R′O (where R′O represents one or more of MgO, CaO, SrO, BaO, and ZnO), and 0.1 to 15% of CuO It is preferable to contain.
- the content and total content of each component are expressed in mol%, and the Cu + amount and the total Cu amount are expressed in wt%.
- P 2 O 5 is a main component that forms glass, and is an essential component for enhancing the light-cutting property in the near-infrared region. However, if the content is less than 50%, the effect of cutting properties cannot be sufficiently obtained, and if the content exceeds 75%, the glass becomes unstable and the weather resistance is lowered.
- the content of P 2 O 5 is more preferably 52 to 73%, further preferably 54 to 70%, and still more preferably 55 to 65%.
- Al 2 O 3 is a main component that forms glass, and is an essential component for increasing the weather resistance of glass, increasing the strength of glass, and the like. However, if the content is less than 5%, those effects cannot be sufficiently obtained, and if the content exceeds 22%, the glass becomes unstable and the infrared cut property is lowered, which is not preferable.
- the content of Al 2 O 3 is more preferably 7 to 20%, and further preferably 9 to 18%.
- R 2 O (where R 2 O represents one or more of Li 2 O, Na 2 O, and K 2 O) lowers the glass liquidus temperature, which lowers the glass melting temperature. It is an essential ingredient for lowering and stabilizing the glass. However, if the content is less than 0.5%, those effects cannot be sufficiently obtained, and if the content exceeds 20%, the glass becomes unstable, which is not preferable.
- the content of R 2 O is more preferably 1 to 18%, further preferably 1.5 to 16%, and still more preferably 2 to 15%.
- Li 2 O is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, and the like.
- its content is preferably 0 to 10%. If the content exceeds 10%, the glass becomes unstable.
- the content of Li 2 O is more preferably 0.5 to 8%, and further preferably 1 to 7%.
- Na 2 O is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, and the like.
- its content is preferably 0 to 20%. If the content exceeds 20%, the glass becomes unstable, which is not preferable.
- the content of Na 2 O is more preferably 0.7 to 18%, and further preferably 1 to 16%.
- K 2 O is a component having effects such as lowering the melting temperature of glass and lowering the liquidus temperature of glass.
- its content is preferably 0 to 15%. If the content exceeds 15%, the glass becomes unstable, which is not preferable.
- the content of K 2 O is more preferably 0.5 to 13%, still more preferably 0.7 to 10%.
- the near-infrared cut filter glass may contain B 2 O 3 in the range of 0 to 10% or less in order to stabilize the glass. If the content exceeds 10%, the melting temperature may become too high, which is not preferable.
- the content of B 2 O 3 is preferably 0 to 9%, more preferably 0 to 8.5%, still more preferably 0 to 8%, and most preferably 0 to 7.5%. is there.
- R′O (where R′O represents one or more of MgO, CaO, SrO, BaO, and ZnO) lowers the glass melting temperature, lowers the liquidus temperature of the glass It is an essential component for stabilizing the glass and increasing the strength of the glass. However, if the content is less than 0.1%, those effects cannot be obtained sufficiently, and if the content exceeds 25%, the glass becomes unstable, the infrared cut property is lowered, the strength of the glass is lowered, etc. This is not preferable because of the problem.
- the content of R′O is more preferably 1 to 23%, further preferably 1.5 to 22%, still more preferably 2 to 20%, and most preferably 2.5 to 19%. It is.
- MgO is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, increasing the strength of the glass, and the like.
- its content is preferably 1 to 15%. If the content is less than 1%, these effects cannot be sufficiently obtained, and if the content exceeds 15%, the glass becomes unstable, which is not preferable.
- the content of MgO is more preferably 1.5 to 13%, still more preferably 2 to 10%.
- CaO is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, increasing the strength of the glass, and the like.
- its content is preferably 0.1 to 10%. If the content is less than 0.1%, these effects cannot be obtained sufficiently, and if the content exceeds 10%, the glass becomes unstable, which is not preferable.
- the content of CaO is more preferably 0.3 to 8%, and further preferably 0.5 to 6%.
- SrO is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, and the like.
- its content is preferably 1 to 10%. If the content is less than 1%, those effects cannot be sufficiently obtained, and if the content exceeds 10%, the glass becomes unstable, which is not preferable.
- the SrO content is more preferably 0.3 to 8%, and further preferably 0.5 to 8%.
- BaO is a component for lowering the melting temperature of the glass, lowering the liquidus temperature of the glass, stabilizing the glass, and the like.
- its content is preferably 0.1 to 10%. If the content is less than 0.1%, these effects cannot be obtained sufficiently, and if the content exceeds 10%, the glass becomes unstable, which is not preferable.
- the content of BaO is more preferably 0.5 to 8%, and further preferably 1 to 6%.
- ZnO has effects such as lowering the melting temperature of the glass and lowering the liquidus temperature of the glass.
- its content is preferably 0.5 to 15%. If the content is less than 0.5%, those effects cannot be sufficiently obtained, and if the content exceeds 15%, the glass solubility is deteriorated, which is not preferable.
- the content of ZnO is more preferably 1 to 13%, and further preferably 1.5 to 10%.
- CuO is an essential component for near infrared cut. However, if the content is less than 0.1%, the near-infrared cut effect cannot be sufficiently obtained when the thickness of the glass is reduced, and if the content exceeds 15%, the transmittance in the visible region is lowered. Therefore, it is not preferable.
- the CuO content is more preferably 0.1 to 14.5%, still more preferably 0.2 to 14%, and still more preferably 0.5 to 13.5%.
- the total amount of Cu is the total amount of Cu in wt% including monovalent, divalent and other valences present.
- the total amount of Cu in the glass is preferably 0.1 to 15% by weight.
- the content of Cu + amount, in weight percentages, (Cu + amount / total amount of Cu) ⁇ 100 [%] can be determined in the range such that 0.01 to 7.0%.
- Sb 2 O 3 is not an essential component, it has the effect of increasing the transmittance in the visible region by increasing the oxidizability of the glass and suppressing the increase in the concentration of Cu + ions.
- Sb 2 O 3 When Sb 2 O 3 is contained, its content is preferably 0.01 to 2%. If the content exceeds 2%, the stability of the glass decreases, which is not preferable.
- the content of Sb 2 O 3 is more preferably 0.02 to 2%, further preferably 0.05 to 1.8%, still more preferably 0.1 to 1.6%, Most preferably, it is 0.9 to 1.5%.
- F is an effective component for increasing the weather resistance, but it is preferably not substantially contained since it is an environmental load substance.
- substantially does not contain means that it is not intended to be used as a raw material, and is regarded as not containing raw material components or inevitable impurities mixed in from the manufacturing process.
- the glass of the present invention PbO, As 2 O 3, it is preferable that the V 2 O 5 does not substantially contain.
- PbO is a component that lowers the viscosity of the glass and improves manufacturing workability.
- As 2 O 3 is a component that acts as an excellent clarifier that can generate a clarified gas in a wide temperature range.
- PbO and As 2 O 3 are environmentally hazardous substances, it is desirable not to contain them as much as possible.
- V 2 O 5 absorbs light having a wavelength in the visible region, it is desirable that V 2 O 5 not be contained as much as possible in the near-infrared cut filter glass for a solid-state imaging device that is required to have high transmittance in the visible region.
- a nitrate compound or a sulfate compound having a cation forming glass can be added as an oxidizing agent or a clarifying agent.
- the oxidizing agent has an effect of adjusting the Cu + amount / total Cu amount of the Cu component in the glass to a desired range.
- the addition amount of the nitrate compound or sulfate compound is preferably 0.5 to 10% by mass based on the total amount of the raw material mixture having the glass composition described above. If the addition amount is less than 0.5% by mass, there is no effect of improving the transmittance, and if the addition amount exceeds 10% by mass, it becomes difficult to form glass.
- the addition amount of the nitrate compound or sulfate compound is more preferably 1 to 8% by mass, and further preferably 3 to 6% by mass.
- nitrate compounds Al (NO 3 ) 3 , LiNO 3 , NaNO 3 , KNO 3 , Mg (NO 3 ) 2 , Ca (NO 3 ) 2 , Sr (NO 3 ) 2 , Ba (NO 3 ) 2 , Zn (NO 3 ) 2 , Cu (NO 3 ) 2 and the like.
- the near-infrared cut filter glass of the present invention can achieve good spectral characteristics even when the thickness of the glass is thin in order to cope with the downsizing and thinning of the imaging device and its mounted equipment.
- the glass thickness is preferably less than 1 mm, more preferably less than 0.8 mm, still more preferably less than 0.6 mm, and most preferably less than 0.4 mm.
- the lower limit value of the glass thickness is not particularly limited, but it is preferably 0.1 mm or more in consideration of the strength that is difficult to break during the manufacture of the glass or the conveyance during the incorporation into the imaging apparatus.
- the near-infrared cut filter glass of the present invention preferably has a fracture toughness value of 0.3 MPa ⁇ m 1/2 or more.
- the fracture toughness value of the near infrared cut filter glass is preferably 0.35 MPa ⁇ m 1/2 or more, more preferably 0.4 MPa ⁇ m 1/2 or more, further preferably 0.43 MPa ⁇ m 1/2 or more, most Preferably, it is 0.45 MPa ⁇ m 1/2 or more.
- the glass of the present invention may be provided with an optical thin film such as an antireflection film, an infrared cut film, an ultraviolet cut film and an infrared cut film on the glass surface.
- optical thin films are composed of a single layer film or a multilayer film, and can be formed by a known method such as a vapor deposition method or a sputtering method.
- the near infrared cut filter glass of the present invention can be produced, for example, as follows. First, the raw materials are weighed and mixed so that the obtained glass is in the above composition range. This raw material mixture is placed in a platinum crucible and heated and melted at a temperature of 700 to 1400 ° C. in an electric furnace. After sufficiently stirring and clarifying, the melt is cast into a mold and slowly cooled, and then the melt is cut and polished to form a flat plate having a predetermined thickness. Thus, a near infrared cut filter glass is manufactured. In the said manufacturing method, it is preferable that the highest temperature of the glass melt during glass melting shall be 1400 degrees C or less.
- the temperature is more preferably 1350 ° C. or less, and most preferably 1300 ° C. or less. Moreover, if the highest temperature of the glass melt being melted becomes too low, crystallization occurs during melting, and it takes time to melt off. Therefore, the temperature is preferably 700 ° C. or higher, and more preferably 750 ° C. or higher.
- Table 1 shows examples and comparative examples of the present invention. Examples 1 to 4 are examples of the present invention, and Example 5 is a comparative example of the present invention.
- the raw materials are weighed and mixed so as to have the composition (mol%) shown in Table 1, the raw material mixture is put into a platinum crucible having an internal volume of about 400 cc, and the raw material mixture is melted at the melting temperature shown in Table 1 for 2 hours. did. Then, after clarification and stirring, the melt was cast into a rectangular mold of length 100 mm ⁇ width 80 mm ⁇ height 20 mm preheated to about 300 to 500 ° C., and then slowly cooled at about 1 ° C./min to obtain a sample glass. It was. However, in Table 1, the amount of Cu + and the total amount of Cu are expressed by weight%.
- the solubility of the glass and the like were visually observed at the time of preparing the sample, and it was confirmed that the obtained glass sample had no bubbles or striae.
- P 2 O 5 contains at least one substance selected from H 3 PO 4 , Al (PO 3 ) 3 , Mg (PO 3 ) 2 , Zn (PO 3 ) 2, and Cu (PO 3 ) 2 as Al 2 O 3 is Al (PO 3 ) 3 , Li 2 O is LiNO 3 , Na 2 O is NaNO 3 , K 2 O is KNO 3 , B 2 O 3 is PBO 4 and / or H 3 BO 3 , CaO is CaCO 3 , MgO is MgO and / or Mg (PO 3 ) 2 , BaO is BaCO 3 , ZnO is an oxide and / or Zn (PO 3 ) 2 , CuO used oxide and / or Cu (PO 3 ) 2 , respectively.
- the transmittance was evaluated using an ultraviolet-visible near-infrared spectrophotometer (trade name: V-570, manufactured by JASCO Corporation). Specifically, a glass sample of a plate-like body in which both sides of 40 mm long ⁇ 30 mm wide ⁇ 0.3 mm thick were optically polished was prepared, and the transmittance was measured.
- V-570 ultraviolet-visible near-infrared spectrophotometer
- the above-mentioned optically polished glass sample was used in a high-temperature and high-humidity tank at 85 ° C. and a relative humidity of 85% for 120 hours using a high-temperature and high-humidity tank (product name: PL-1J)
- PL-1J high-temperature and high-humidity tank
- Fracture toughness values were determined by using a Vickers hardness tester (Futuretech Co., Ltd., trade name: FLC-50V) to inject a Vickers indenter onto an optically polished glass surface with a thickness of 0.3 mm. From this, the calculation formula described in JIS R1607 was used.
- the extinction coefficient of the glass sample was calculated by measuring the transmittance at a wavelength of 430 nm and a wavelength of 800 nm using the aforementioned UV-visible near-infrared spectrophotometer and excluding the reflection loss on the front and back surfaces.
- the transmittance value was converted so as to have a thickness of 0.3 mm.
- the conversion of the wall thickness was performed using the following formula 1.
- T i1 is the transmittance of the measurement sample
- t 1 is the thickness of the measurement sample
- T i2 is the transmittance of the converted value
- t 2 is the converted thickness (0.3 in the present invention). is there.
- the Cu + amount was measured by an oxidation-reduction titration method, and the total Cu amount was measured by an ICP emission analysis method (device name: ICPE-9000, manufactured by Shimadzu Corporation).
- the oxidation-reduction titration method used for measuring the Cu + amount of the Cu component in the glass was performed according to the following procedures (1) to (4).
- each of the solutions platinum vessel (A) and from (B) to beaker (1 + 100) H 2 SO 4 (the (1 + 100) H 2 SO 4 is, H 2 SO 4 in volume ratio the of H 2 O was transferred using a.) indicating a sulfuric acid solution containing 100 against 1 was a liquid in the beaker to about 250 ml.
- (Cu + amount / total Cu amount) ⁇ 100 [%] is in the range of 0.01 to 7.0%, and the extinction coefficient at a wavelength of 430 nm is at a wavelength of 800 nm.
- the numerical value divided by the extinction coefficient is in the range of 0.00001 to 0.19, and the spectral transmittance at a thickness of 0.3 mm is 50 to 92% at a wavelength of 430 nm. Therefore, it can be suitably used as a near-infrared cut filter glass for a solid-state imaging device.
- the fracture toughness value is 0.3 MPa ⁇ m 1/2 or more, it can be made difficult to break even if it is made thin.
- the near-infrared cut filter glass of the present invention even in the composition system having high strength even if it is thinned, even when the content of the Cu component is large, because the transmittance of light in the visible region of the glass is high, It is extremely useful for near-infrared cut filter applications of imaging devices that are becoming smaller and thinner.
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Abstract
Description
P2O5を50~75%、
Al2O3を5~22%、
R2Oを0.5~20%(R2Oは、Li2O、Na2O、およびK2Oのいずれか1つ以上の物質を表す。)、
R’Oを0.1~25%(R’Oは、MgO、CaO、SrO、BaO、およびZnOのいずれか1つ以上の物質を表す。)、および
CuOを0.1~15%
含有する。
モル%表示で、
P2O5を50~75%、
Al2O3を5~22%、
R2Oを0.5~20%(ただし、R2Oは、Li2O、Na2O、およびK2Oのいずれか1つ以上の物質を表す)、
R’Oを0.1~25%(ただし、R’Oは、MgO、CaO、SrO、BaO、およびZnOのいずれか1つ以上の物質を表す)、および
CuOを0.1~15%
含有するのが好ましい。
Claims (6)
- P、Al、R(Rは、Li、Na、およびKのいずれか1つ以上の成分を表す。)、R’(R’は、Mg、Ca、Sr、Ba、およびZnのいずれか1つ以上の成分を表す。)、およびCuの各成分を含有し、実質的にFを含有しない近赤外線カットフィルタガラスであって、
(Cu+量/全Cu量)×100[%]が、0.01~7.0%であることを特徴とする近赤外線カットフィルタガラス。 - 前記近赤外線カットフィルタガラスは、さらに、モル%表示でB2O3を0~10%含有する、請求項1に記載の近赤外線カットフィルタガラス。
- 前記近赤外線カットフィルタガラスの破壊靭性値が0.3MPa・m1/2以上である、請求項1または2に記載の近赤外線カットフィルタガラス。
- 前記近赤外線カットフィルタガラスの波長430nmにおける吸光係数を波長800nmにおける吸光係数で割った数値が、0.00001~0.19である、請求項1~3のいずれか1項に記載の近赤外線カットフィルタガラス。
- 前記近赤外線カットフィルタガラスの肉厚0.3mmにおける波長430nmの透過率が50~92%である、請求項1~4のいずれか1項に記載の近赤外線カットフィルタガラス。
- 前記近赤外線カットフィルタガラスは、モル%表示で、
P2O5を50~75%、
Al2O3を5~22%、
R2Oを0.5~20%(R2Oは、Li2O、Na2O、およびK2Oのいずれか1つ以上の物質を表す。)、
R’Oを0.1~25%(R’Oは、MgO、CaO、SrO、BaO、およびZnOのいずれか1つ以上の物質を表す。)、および
CuOを0.1~15%
含有する、請求項1~5のいずれか1項に記載の近赤外線カットフィルタガラス。
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JP2017514211A JPWO2016171255A1 (ja) | 2015-04-24 | 2016-04-22 | 近赤外線カットフィルタガラス |
KR1020177028740A KR20170139010A (ko) | 2015-04-24 | 2016-04-22 | 근적외선 컷 필터 유리 |
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