WO2021132645A1 - 近赤外線吸収ガラスおよび近赤外線カットフィルタ - Google Patents
近赤外線吸収ガラスおよび近赤外線カットフィルタ Download PDFInfo
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Images
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
- 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
-
- 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
-
- 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
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/23—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron
- C03C3/247—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron containing fluorine and phosphorus
-
- 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
-
- 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
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
-
- 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
- C03C2204/00—Glasses, glazes or enamels with special properties
Definitions
- the present invention relates to a near-infrared absorbing glass and a near-infrared cut filter.
- the near-infrared cut filter is an unnecessary near-infrared light (wavelength 700) in the sensitivity wavelength range of the image sensor in order to make the light entering the image sensor such as CCD or CMOS have an optical wavelength distribution corresponding to the human relative luminous efficiency curve. It has a function of cutting up to 1200 nm).
- the near-infrared cut filter is generally provided immediately before the image sensor.
- Near-infrared cut filters are widely used with near-infrared absorbing glass as the base material and polished on a flat plate.
- Near-infrared absorbing glass generally contains Cu ions.
- FIG. 1 shows an example of the spectral transmission characteristics of the near-infrared absorbing glass. Note that FIG. 1 does not limit the present invention in any way.
- the light absorption characteristics near the wavelength of 700 to 1200 nm are expressed by Cu ions (Cu 2+) in the glass.
- phosphate glass containing Cu ions is useful as a glass for a near-infrared cut filter because it can exhibit the near-infrared absorption characteristics of Cu ions (Cu 2+) in a wide wavelength range (for example, patented). Reference 1).
- the wavelength at which the transmittance is 50% is called "half value" and is one of the main standards of the near-infrared cut filter.
- the half price varies depending on the specifications of the filter, but is often set in the wavelength range of 600 nm to 650 nm.
- As a general method of setting the half value to a desired value there is a method of adjusting either the plate thickness of the glass base material or the Cu ion (Cu 2+) concentration in the glass according to the Lambert-Beer law.
- the near-infrared cut filter has an excellent ability to cut near-infrared rays (that is, has a desired half value but a low transmittance of near-infrared light), and also has a transmittance of visible light (wavelength 400 to 600 nm). It is also required to be expensive.
- the image sensor module mounted on a smartphone or the like is required to have both miniaturization and high performance, and therefore, the plate thickness of the near-infrared cut filter is required to be thin.
- the concentration of Cu ions (Cu 2+) in the glass In order to reduce the wall thickness while maintaining the ability to cut near infrared rays, it is necessary to increase the concentration of Cu ions (Cu 2+) in the glass.
- Cu + Cu ions
- the near-infrared cut filter has high chemical durability (that is, excellent weather resistance) in a high temperature and high humidity environment.
- one aspect of the present invention provides a near-infrared absorbing glass having excellent near-infrared cutting ability, high visible light transmittance, and excellent weather resistance, and a near-infrared absorbing glass comprising such near-infrared absorbing glass.
- the purpose is.
- the present inventors examined the glass composition from the following two viewpoints in order to increase the visible light transmittance.
- a glass composition capable of obtaining a desired half value and sufficient near-infrared ray cutting ability even with a smaller amount of Cu than before.
- the present inventors assume a complex glass skeleton in which P 2 O 5 is arranged around Cu 2+ , and monovalent and divalent ions which are intermediate components other than these glass skeletons.
- P 2 O 5 is arranged around Cu 2+
- monovalent and divalent ions which are intermediate components other than these glass skeletons.
- the present inventors can improve the meltability of the glass raw material batch by keeping the ratio of the network-forming components of glass such as Al and P to a certain level or less, and can melt and mold at a lower temperature than before. I found that
- the present inventors can reduce the amount of Cu required to achieve the desired half value by setting the ratio of O and P in the entire glass to a certain level or higher, and further, POP having poor water resistance. It was found that it is possible to suppress the formation of cross-linked bonds and improve the weather resistance.
- one aspect of the present invention is As a constituent ion P ion, Cu ion, O ion, One or more ions selected from the group consisting of Li ion, Na ion and K ion, and One or more ions selected from the group consisting of Mg ion, Ca ion, Sr ion and Ba ion, Including at least In the glass composition indicated by cation%,
- the Cu ion content is 15.0 cation% or less
- the content of P ions is 55.0 cation% or less
- Cation ratio of total content of Al ion and P ion to total content of Mg ion, Ca ion, Sr ion, Ba ion, Zn ion and Cu ion ((Al ion + P ion) / (Mg ion + Ca ion + Sr ion) + Ba ion + Zn ion + Cu ion)) is 5.300 or less
- a near-infrared absorbing glass having an O ion content of 85.0 anion% or more and a ratio of the O ion content to the P ion content (O ion / P ion) of 3.300 or more. (Hereafter, it is also simply referred to as "glass”.), Regarding.
- the above-mentioned near-infrared absorbing glass can have excellent near-infrared ray cutting ability, high visible light transmittance, and excellent weather resistance and melting property.
- a near-infrared absorbing glass having excellent near-infrared ray cutting ability, high visible light transmittance, and excellent weather resistance and melting property. Further, according to one aspect of the present invention, it is possible to provide a near-infrared cut filter made of such a near-infrared absorbing glass.
- the near-infrared absorbing glass is a glass having a property of absorbing light of at least the entire region or a part of the near-infrared wavelength region (wavelength 700 to 1200 nm).
- the near-infrared absorbing glass according to one aspect of the present invention can be an oxide glass because it contains O ions (oxygen ions) as constituent ions.
- Oxide glass is glass in which the main network-forming component of glass is oxide.
- the near-infrared absorbing glass according to one aspect of the present invention can be a phosphate glass because it contains P ions (phosphorus ions) as well as O ions (oxygen ions) as constituent ions.
- cation% is a value calculated by "(number of cations of interest / total number of cations of glass component) x 100" and means a molar percentage of the amount of cations of interest to the total amount of cations. To do.
- anion% is a value calculated by "(number of anions of interest / total number of anions of glass component) x 100" and means a molar percentage of the amount of anions of interest with respect to the total amount of anions. ..
- the molar ratio of the content of the cations is equal to the ratio of the content of the cation of interest by the cation% indication, and the molar ratio of the content of the anions is the ratio of the content of the anion of interest by the anion% indication. equal.
- the molar ratio of the cation content to the anion content is the ratio of the contents (in mol%) of the components of interest when the total amount of all cations and all anions is 100 mol%.
- the content of each component is determined by a known method, for example, an inductively coupled plasma emission spectroscopic analysis method (ICP-AES), an inductively coupled plasma mass spectrometry method (ICP-MS), an ion chromatography method, or the like.
- Content rate (% by mass of element) can be quantified. By dividing the content of this element (mass% of the element) by the atomic weight, the content of each element in mol% can be obtained, and the cation% and the anion% can be obtained from the values.
- the content of the constituent component is 0% or not contained or introduced, which means that the constituent component is substantially not contained, and the constituent component is at an unavoidable impurity level. It is permissible to be included.
- the unavoidable impurity level means, for example, less than 0.01%.
- the formal valence of each cation is used to determine the average valence of the cations, which will be described in detail later.
- the formal valence is the valence required for the oxide to maintain its electrical neutrality when the valence of the oxygen ions (anions) that make up the oxide is -2 for the oxide of the cation of interest. Yes, it can be uniquely obtained from the chemical formula of the oxide.
- the valence of Cu is +2 in order to maintain the electrical neutrality between O 2- and Cu contained in the chemical formula of CuO oxide.
- the valence of P is +5 in order to maintain the electrical neutrality between O2- and P contained in the chemical formula of oxide P2O5.
- the form valence of the cation A X O Y is "+ 2X / Y". Therefore, when analyzing the glass composition, it is not necessary to analyze the valence of the cation.
- the valence of the anion (for example, the valence of the oxygen ion is -2) is also a formal valence based on the idea that the oxygen ion accepts two electrons and has a closed shell structure. Therefore, when analyzing the glass composition, it is not necessary to analyze the valence of the anion. Further, as described above, a part of Cu 2+ can become Cu + at the time of melting, but since the amount thereof is small, the valence of Cu can be set to +2 when calculating the average valence.
- P ions are network-forming components of glass.
- the P ion content of the glass is 55.0% or less, preferably 53.0% or less, and more preferably 51.0% or less from the viewpoint of improving weather resistance and meltability. It is more preferably 50.0% or less, further preferably 49.0% or less, further preferably 48.0% or less, and even more preferably 47.0% or less. , 46.0% or less is even more preferable, 45.0% or less is even more preferable, and 44.0% or less is even more preferable. Since the glass contains P ions as constituent ions, the P ion content is more than 0%.
- the P ion content is preferably 30.0% or more, more preferably 32.0% or more. , 34.0% or more, more preferably 36.0% or more, further preferably 38.0% or more, and even more preferably 39.0% or more. It is even more preferably 40.0% or more, and even more preferably 41.0% or more.
- the formal valence of the P ion is +5.
- the Cu ions are components that contribute to providing glass with the ability to cut near infrared rays.
- the Cu ion content of the glass is 15.0% or less, preferably 13.0% or less, more preferably 11.0% or less, and 9 It is more preferably 0.0% or less. Since the glass contains Cu ions as constituent ions, the Cu ion content is more than 0%. In order to have a sufficient near-infrared ray cutting ability, the Cu ion content is preferably 0.5% or more, more preferably 1.5% or more, and preferably 2.5% or more. More preferred.
- the glass can be used as a near-infrared cut filter glass having a thickness of 0.25 mm or less.
- the Cu ion content is preferably 1.5% or more as a glass suitable for a near-infrared cut filter having a relatively thin thickness within the above thickness range (hereinafter, also referred to as “glass I”). 1.7% or more, 1.9% or more, 2.1% or more, 2.3% or more, 2.5% or more, 2.7% or more, 2.9% or more, 3.1% or more, 3. 3% or more, 3.5% or more, 3.7% or more, 3.9% or more, 4.1% or more, 4.5% or more, 4.7% or more, 4.9% or more, 5.1% The above order is preferable.
- the Cu ion content of glass I is preferably 15.0% or less, preferably 13.0% or less and 11.0% or less. , 10.0% or less, 9.0% or less, 8.5% or less, 8.0% or less, 7.5% or less, 7.0% or less, 6.5% or less, 6.0% or less in that order. More preferred.
- d is the thickness for which a preferable value of Cu ion is desired to be obtained, and the unit is mm.
- the preferable range of Cu ions is set. It can be obtained by multiplying the above preferable range by (0.11 / d).
- the Cu ion content is preferably 0.5% or more, 0.7% or more, 0.9% or more, 1.1% or more, 1.3%. Above, 1.5% or more, 1.7% or more, 1.9% or more, 2.1% or more, 2.3% or more, 2.5% or more are more preferable.
- the Cu ion content of Glass II is preferably 10.0% or less, and 9.0% or less, 8 5.5% or less, 8.0% or less, 7.5% or less, 7.0% or less, 6.5% or less, 6.0% or less, 5.5% or less, 5.0% or less, 4.5 % Or less, 4.0% or less, and 3.5% or less are more preferable.
- the formal valence of Cu ions is +2.
- the Li ion content of the glass can be 0%, 0% or more, or more than 0%.
- Li ion is a component having a function of improving devitrification resistance during melting and molding of glass.
- the Li ion content is preferably 10.0% or more, more preferably 12.0% or more, still more preferably 13.0% or more. , 14.0% or more, more preferably 15.0% or more, further preferably 16.0% or more, and even more preferably 17.0% or more. It is even more preferably 18.0% or more, even more preferably 20.0% or more, even more preferably 20.5% or more, and even more preferably 21.0% or more.
- the Li ion content is preferably 32.0% or less, preferably 31.0% or less. It is more preferably 30.5% or less, further preferably 30.0% or less, further preferably 29.5% or less, and 29.0% or less.
- Li ion content> Na ion content it is preferable to set “Li ion content> K ion content”.
- the Na ion content of the glass can be 0%, 0% or more, or more than 0%.
- Na ion is also a component having a function of improving the meltability of glass.
- the Na ion content is 30.0% or less. It is preferably 28.0% or less, more preferably 27.0% or less, further preferably 25.0% or less, and further preferably 23.0% or less.
- the formal valence of Na ions is +1. In one form, from the above viewpoint, it is preferable that "Na ion content ⁇ Li ion content", and "Na ion content ⁇ K ion content” is preferable.
- the K ion content of the glass can be 0%, 0% or more, or more than 0%.
- K ion is also a component having a function of improving the meltability of glass and further improving the devitrification resistance during melting and molding.
- the K ion content is preferably 3.0% or more, more preferably 4.0% or more, further preferably 5.0% or more, and 6.0%.
- the above is even more preferable, 7.0% or more is even more preferable, 8.0% or more is even more preferable, and 9.0% or more is even more preferable. It is even more preferably 10.0% or more.
- the K ion content is preferably 20.0% or less, preferably 19.0% or less. It is more preferably 17.0% or less, further preferably 15.0% or less, further preferably 14.5% or less, and 14.0% or less. It is even more preferably 13.5% or less, even more preferably 13.0% or less, even more preferably 12.5% or less, 12 It is particularly preferable that it is 0.3% or less.
- the formal valence of the K ion is +1. In one form, from the above viewpoint, it is preferable that "K ion content ⁇ Li ion content" and "K ion content> Na ion content".
- the glass contains one or more ions selected from the group consisting of Li ion, Na ion and K ion as constituent ions. That is, the glass can contain only Li ions in one form, can contain only Na ions in another form, can contain only K ions in another form, and can contain only K ions. Can contain Li and Na ions, another form can contain Li and K ions, another form can contain Na and K ions, and yet another form. Can include Li ions, Na ions and K ions.
- the glass can also contain alkali metal ions other than Li ion, Na ion and K ion.
- alkali metal ions include Cs ions.
- the Cs ion content of the glass can be 0%, 0% or more or more than 0%.
- the formal valence of the Cs ion is +1.
- the total content of Li ion, Na ion and K ion is preferably 19.0% or more, and preferably 21.0% or more. More preferably, it is 23.0% or more, further preferably 25.0% or more, further preferably 27.0% or more, further preferably 28.0% or more. It is even more preferably 29.0% or more, even more preferably 30.0% or more, even more preferably 30.5% or more, and even more preferably 31.0% or more. Even more preferably, 32.0% or more, 32.5% or more, 33.0% or more, 33.5% or more, 34.0% or more, 34.5% or more, 35.
- the total content of Li ion, Na ion and K ion is 56.0% or less. It is preferably 54.0% or less, more preferably 52.0% or less, further preferably 50.0% or less, and 48.0% or less.
- the Mg ion content of the glass can be 0%, 0% or more, or more than 0%.
- the Mg ion content is preferably 0.3% or more, preferably 0.5. % Or more is more preferable, 0.8% or more is further preferable, 1.1% or more is further preferable, and 1.3% or more is even more preferable.
- the Mg ion content is preferably 7.0% or less, more preferably 6.0% or less.
- Mg ion content ⁇ Ca ion content it is preferable that "Mg ion content ⁇ Ba ion content" is preferable.
- the Ca ion content of the glass can be 0%, 0% or more, or more than 0%.
- the Ca ion content is preferably 1.3% or more, preferably 1.5% or more. It is more preferably 1.7% or more, further preferably 1.9% or more, even more preferably 2.1% or more, and 2.3% or more. Even more preferably, it is even more preferably 2.5% or more, and particularly preferably 2.7% or more.
- the Ca ion content is preferably 9.0% or less, more preferably 8.0% or less, and 7 It is more preferably 0.0% or less, further preferably 6.0% or less, further preferably 5.0% or less, further preferably 4.5% or less, 4 It is even more preferably 2.2% or less, even more preferably 3.9% or less, even more preferably 3.7% or less, and 3.5% or less. Especially preferable.
- the formal valence of Ca ions is +2. In one form, from the above viewpoint, it is preferable to set “Ca ion content> Mg ion content”, and it is preferable to set “Ca ion content> Sr ion content”.
- the Sr ion content of the glass can be 0%, 0% or more, or more than 0%.
- the Sr ion content is preferably 0.2% or more, preferably 0.4% or more. It is more preferably 0.6% or more, further preferably 0.8% or more, and even more preferably 0.9% or more.
- the Sr ion content is preferably 4.0% or less, more preferably 3.5% or less. 2.
- Sr ion content ⁇ Ca ion content is preferable, and "Sr ion content ⁇ Ba ion content” is preferable.
- the Ba ion content of the glass can be 0%, 0% or more, or more than 0%.
- the Ba ion content is preferably 1.5% or more, preferably 2.5% or more. It is more preferably 2.9% or more, further preferably 3.1% or more, further preferably 3.3% or more, and 3.5% or more. Is even more preferable.
- the Ba ion content is preferably 10.0% or less, more preferably 9.5% or less, and 9 It is more preferably 0.0% or less, further preferably 8.5% or less, further preferably 8.0% or less, even more preferably 7.5% or less, 7 It is even more preferably 0.0% or less, even more preferably 6.5% or less, even more preferably 6.0% or less, and still more preferably 5.6% or less. Even more preferably, it is even more preferably 5.3% or less, and even more preferably 5.0% or less, 4.7% or less, 4.5% or less, 4.3% or less. preferable.
- the formal valence of the Ba ion is +2. In one form, from the above viewpoint, it is preferable to set "Ba ion content> Ca ion content", and it is preferable to set "Ba ion content> Sr ion content”.
- the glass contains one or more ions selected from the group consisting of Mg ions, Ca ions, Sr ions and Ba ions. From the viewpoint of lowering the average valence and increasing the visible light transmittance, it is preferable that the total content of Mg ion, Ca ion, Sr ion and Ba ion is small.
- the total content of Mg ion, Ca ion, Sr ion and Ba ion is preferably 20.0% or less, preferably 19.0% or less, from the above viewpoint and the viewpoint of further improving the meltability. It is more preferably 18.0% or less, further preferably 17.5% or less, further preferably 17.0% or less, and preferably 16.5% or less.
- the total content of Mg ion, Ca ion, Sr ion and Ba ion is preferably 3.0% or more, preferably 4.0% or more, from the viewpoint of suppressing the decrease in liquid phase temperature and improving the weather resistance.
- the above glass has Mg ions, with respect to the total content of Li ions, Na ions and K ions.
- the cation ratio ((Mg ion + Ca ion + Sr ion + Ba ion) / (Li ion + Na ion + K ion)) of the total content of Ca ion, Sr ion and Ba ion is 0.100 or more, and 0.105 or more. It is preferably 0.110 or more, more preferably 0.115 or more, further preferably 0.120 or more, further preferably 0.125 or more, and 0.
- the cation ratio ((Mg ion + Ca ion + Sr ion + Ba ion) / (Li ion + Na ion + K ion)) is 0.650 or less. It is preferably 0.620 or less, more preferably 0.590 or less, further preferably 0.560 or less, further preferably 0.530 or less, and 0.
- .500 or less it is even more preferably .500 or less, even more preferably 0.460 or less, even more preferably 0.430 or less, even more preferably 0.400 or less, and 0. Even more preferably, it is 0.350 or less, 0.350 or less, 0.320 or less, 0.310 or less, 0.300 or less, 0.295 or less, 0.290 or less, 0.287 or less. , 0.285 or less, which is even more preferable.
- the cation ratio is in the above range.
- the Al ion content of the glass can be 0%, 0% or more or more than 0%.
- the Al ion content is preferably 1.0% or more, more preferably 1.3% or more. 2. It is more preferably 5% or more, further preferably 1.7% or more, further preferably 1.9% or more, and even more preferably 2.1% or more. It is even more preferably 3% or more, and even more preferably 2.5% or more.
- the Al ion content is preferably 8.0% or less, more preferably 7.0% or less.
- the total content of Al ions and P ions (Al ions + P ions) of the glass is preferably 40.0% or more from the viewpoint of enhancing the thermal stability and mechanical strength of the glass. It is more preferably 0% or more, further preferably 42.0% or more, further preferably 42.5% or more, further preferably 43.0% or more, and 44.0. % Or more is even more preferable, 44.5% or more is even more preferable, and 45.0% or more is even more preferable. Further, from the viewpoint of further improving the meltability of the raw material and further suppressing the formation of Cu + , the total content (Al ion + P ion) is preferably 55.0% or less, preferably 54.0% or less.
- the Zn ion content of the glass can be 0%, 0% or more, or more than 0%. From the viewpoint of lowering the Tg of the glass, the Zn ion content should be introduced in place of Mg and / or Ca and / or Sr and / or Ba as long as it does not significantly affect the action exerted by the various components. Can be done. However, from the viewpoint of improving weather resistance, the Zn ion content is preferably 8.7% or less, more preferably 8.5% or less, further preferably 8.3% or less, and 8 It is more preferably 0.0% or less, further preferably 7.7% or less, further preferably 7.5% or less, and even more preferably 7.3% or less.
- the glass has a cation ratio of Zn ions to the total content of Mg ions, Ca ions, Sr ions, Ba ions and Zn ions (Zn ion / (Mg ion + Ca ion + Sr ion + Ba ion + Zn ion). )) Is preferably 0.600 or less, more preferably 0.580 or less, further preferably 0.570 or less, further preferably 0.560 or less, and further 0.
- the order is .300 or less, 0.200 or less, 0.100 or less, 0.080 or less, 0.060 or less, 0.040 or less, and 0.020 or less.
- the cation ratio Zn ion / (Mg ion + Ca ion + Sr ion + Ba ion + Zn ion)) may be 0 or 0.000.
- the above glass is the sum of Al ion and P ion with respect to the total content of Mg ion, Ca ion, Sr ion, Ba ion, Zn ion and Cu ion.
- the cation ratio of the content ((Al ion + P ion) / (Mg ion + Ca ion + Sr ion + Ba ion + Zn ion + Cu ion)) is 5.3 or less, preferably 5.1 or less, and preferably 4.9 or less.
- the above-mentioned cation ratio ((Al ion + P ion) / (Mg ion + Ca ion + Sr ion + Ba ion + Zn ion + Cu ion)) is 1.
- the glass can optionally contain one or more of the following cations as cations.
- the weather resistance is further improved, the chemical resistance is improved, the decrease in the glass transition temperature is suppressed, and / Alternatively, it can contribute to suppressing the decrease in viscosity at the liquidus temperature.
- the ion content of these rare earth atoms can be 0%, 0% or more or more than 0%, respectively, 3.0% or less, 2.0% or less, 1.0% or less or 0.5%, respectively. It can also be: The formal valence of Y ion, La ion, Gd ion and Yb ion is +3.
- Ti, Zr, Nb, W and Bi are components that contribute to the improvement of weather resistance and chemical resistance of glass, the suppression of Tg decrease, and the suppression of liquid phase viscosity decrease by adding a small amount. ..
- the Ti ion content can be 0%, 0% or more or more than 0%, preferably 3.0% or less, more preferably 2.0% or less, and 1.0% or less. Is more preferable, and 0.5% or less is further preferable.
- the formal valence of Ti ions is +4.
- the Zr ion content can be 0%, 0% or more or more than 0%, preferably 3.0% or less, more preferably 2.0% or less, and 1.0% or less. Is more preferable, and 0.5% or less is further preferable.
- the formal valence of the Zr ion is +4.
- the Nb ion content can be 0%, 0% or more or more than 0%, preferably 3.0% or less, more preferably 2.0% or less, and 1.0% or less. Is more preferable, and 0.5% or less is further preferable.
- the formal valence of Nb ions is +5.
- the W ion content can be 0%, 0% or more or more than 0%, preferably 3.0% or less, more preferably 2.0% or less, and 1.0% or less. Is more preferable, and 0.5% or less is further preferable.
- the formal valence of W ions is +6.
- the Bi ion content can be 0%, 0% or more or more than 0%, preferably 3.0% or less, more preferably 2.0% or less, and 1.0% or less. Is more preferable, and 0.5% or less is further preferable.
- the formal valence of Bi ions is +3.
- the glass has an average valence of less than 1.500, preferably 1.490 or less, preferably 1.480 or less, except for Cu ions and P ions. It is more preferably 1.470 or less, further preferably 1.460 or less, further preferably 1.450 or less, and further preferably 1.440 or less. It is more preferably 1.430 or less, and further preferably 1.420 or less, 1.410 or less, 1.400 or less, 1.390 or less, 1.380 or less, 1.370 or less, 1.360. Hereinafter, it is even more preferable in the order of 1.350 or less.
- the average valence of cations excluding Cu ions and P ions is preferably 1.100 or more, and more preferably 1.1500 or more, from the viewpoint of suppressing a decrease in viscosity at the liquid phase temperature. It is preferably 1.200 or more, more preferably 1.250 or more, further preferably 1.270 or more, further preferably 1.280 or more, and even more preferably 1.290. The above is even more preferable, and the value of 1.300 or more is even more preferable. For example, when changing the Cu concentration when adjusting the wavelength at which the thickness of the glass and the transmittance are 50%, the composition can be readjusted with reference to the above average valence.
- the above average valence is the sum of "content of each cation in cation% x formal valence of the cation" for cations excluding Cu and P ions, in% of cations excluding Cu and P. It is calculated as the value divided by the total content of. For example, in addition to Cu and P ions, A cation (formal value a, content A% in% cation), B cation (formal value b, content B% in% cation) and C cation ( The above average valence is calculated as "(A ⁇ a + B ⁇ b + C ⁇ c) / (A + B + C)" for the glass containing the formal value c and the total content C% in% of the cations.
- the above glass can also refer to the average valence containing Cu ions when changing the Cu concentration when adjusting the wavelength at which the thickness and transmittance of the glass are 50%.
- the average valence of cations obtained in the same manner as above shall be 1.550 or less from the viewpoint of further improving the visible light transmittance. It is more preferably 1.540 or less, further preferably 1.530 or less, further preferably 1.520 or less, and even more preferably 1.510 or less. It is even more preferably 500 or less, and further preferably 1.490 or less, 1.480 or less, 1.470 or less, 1.460 or less, 1.450 or less, 1.440 or less, 1.430 or less.
- the average valence of cations excluding only P ions is preferably 1.300 or more, more preferably 1.310 or more. It is more preferably 1.320 or more, further preferably 1.330 or more, further preferably 1.340 or more, even more preferably 1.350 or more, and 1.360 or more. Is even more preferable.
- the glass contains O ions as constituent ions.
- the O ion content is 85.0% or more, preferably 90.0% or more, and preferably 95.0% or more, from the viewpoint of facilitating homogenization during melting of the glass and increasing productivity. More preferably, it is more preferably 98.0% or more, and even more preferably 99.0% or more.
- the content of O ions is preferably 100%.
- the formal valence of O ion is -2.
- the glass can contain only O ions in one form as anions, and can contain one or more other anions together with O ions in another form.
- examples of other anions include F ion, Cl ion, Br ion, I ion and the like.
- the formal valence of F ion, Cl ion, Br ion, and I ion is -1.
- the content of F ions is preferably 15.0% or less, more preferably 10.0% or less, and more preferably 5.0% or less, from the viewpoint of improving the homogeneity and strength of the glass. Is even more preferable, 2.0% or less is further preferable, and 1.0% or less is even more preferable. In particular, from the viewpoint of suppressing volatilization during glass melting, increasing productivity and suppressing generation of harmful gas during production, F ions may not be contained.
- the glass has a ratio of O ion content (O ion / P ion) to P ion content of 3.300 or more, preferably 3.310 or more. It is more preferably .320 or more, further preferably 3.330 or more, and further preferably 3.340 or more, 3.350 or more, 3.360 or more, 3.370 or more, 3.380 or more, 3 More preferably, in the order of .390 or more, 3.400 or more, 3.410 or more, 3.420 or more, 3.430 or more, 3.440 or more, 3.450 or more, 3.460 or more.
- the above ratio (O ion / P ion) is preferably 3.580 or less. It is more preferably 570 or less, further preferably 3.560 or less, further preferably 3.550 or less, further preferably 3.540 or less, and 3.530 or less. Is even more preferable, and even more preferably, in the order of 3.520 or less, 3.510 or less, 3.500 or less, 3.490 or less.
- the glass is basically composed of the above components, but it is also possible to contain other components as long as the effects of the above components are not impaired. In addition, the glass does not exclude the inclusion of unavoidable impurities.
- the glass does not contain these as glass components.
- U, Th, and Ra are all radioactive elements. Therefore, it is preferable that the glass does not contain these as glass components.
- the content of these elements in terms of oxide based on the oxide glass is preferably 10 mass ppm or less in total, and it is more preferable that these elements are not contained as a glass component.
- Ge, Ta, and Gd are expensive raw materials. Therefore, it is preferable that the glass does not contain these as a glass component.
- Sb (Sb 2 O 3 ), Sn (SnO 2 ), Ce (CeO 2 ), and SO 3 are optionally additive elements that act as clarifying agents.
- Sb (Sb 2 O 3 ) is a clarifying agent having a large clarifying effect.
- Sn (SnO 2 ) and Ce (CeO 2 ) have a smaller clarification effect than Sb (Sb 2 O 3).
- Sb (Sb 2 O 3) it is preferable to add Sb (Sb 2 O 3) while considering the influence of coloring due to the addition.
- the content of Sb 2 O 3 is indicated by external division. That is, when the total content of all glass components other than Sb 2 O 3 , SnO 2 , CeO 2 and SO 3 as oxides is 100.0% by mass, the content of Sb 2 O 3 is, in one form, , Less than 1.0% by mass, less than 0.5% by mass, less than 0.3% by mass, less than 0.2% by mass, less than 0.15% by mass, less than 0.1% by mass or less than 0.1% by mass There can be. In one form, the content of Sb 2 O 3 can be 0% by weight. In another form, the content of Sb 2 O 3 can be more than 0% by mass.
- the content of Sb 2 O 3 is preferably more than 0% by mass, preferably 0.01% by mass. % Or more, 0.03% by mass or more, 0.05% by mass or more, 0.08% by mass or more, and 0.10% by mass or more are more preferable.
- the content of SnO 2 is also indicated by external division. That is, the content of SnO 2 is preferably 2.0 when the total content of all glass components other than SnO 2 , Sb 2 O 3 , CeO 2 and SO 3 as oxides is 100.0% by mass. It is in the range of less than mass%, more preferably less than 1.0% by mass, still more preferably less than 0.5% by mass, still more preferably less than 0.1% by mass.
- the content of SnO 2 may be 0% by mass.
- the content of CeO 2 is also indicated by external division. That is, the content of CeO 2 is preferably 2.0 when the total content of all glass components other than CeO 2 , Sb 2 O 3 , SnO 2 and SO 3 as oxides is 100.0% by mass. It is in the range of less than mass%, more preferably less than 1.0% by mass, still more preferably less than 0.5% by mass, still more preferably less than 0.1% by mass.
- the content of CeO 2 may be 0% by mass. By setting the content of CeO 2 in the above range, the clarity of the glass can be improved.
- the content of SO 3 is also indicated by external division. That is, the content of SO 3 is preferably 2.0 when the total content of all glass components other than SO 3, Sb 2 O 3 , SnO 2 , and CeO 2 as oxides is 100.0% by mass. It is in the range of less than mass%, more preferably less than 1.0% by mass, still more preferably less than 0.5% by mass, still more preferably less than 0.1% by mass.
- the content of SO 3 may be 0% by mass.
- the above glass is suitable as a glass for a near infrared cut filter.
- a half value which is a wavelength at which the spectral transmittance becomes 50% at a wavelength of 600 nm or more can be used as an index, and a transmittance T1200 at a wavelength of 1200 nm can be used as an index.
- the glass can also exhibit high visible light transmittance.
- the transmittance T400 at a wavelength of 400 nm can be used as an index.
- the glass can be used as a near-infrared cut filter glass having a thickness of 0.25 mm or less in one form.
- the half value is preferably 650 nm or less, and further, 647 nm or less and 645 nm as the transmittance characteristic in terms of thickness 0.11 mm.
- the transmittance characteristic in terms of thickness of 0.11 mm is preferably 600 nm or more, and more preferably 610 nm or more, 613 nm or more, 615 nm or more, 617 nm or more, 620 nm or more, 623 nm or more, 625 nm or more, and 628 nm or more.
- the transmittance T1200 at a wavelength of 1200 nm is preferably 42.0% or less, and further 41.0% or less, 40.0% or less, 39 as the transmittance characteristic in terms of thickness 0.11 mm.
- the transmittance T1200 at a wavelength of 1200 nm can be, for example, 10.0% or more, 12.0% or more, or 14.0% or more. Since it can be said that a lower rate means that the near-infrared ray cutting ability is superior, it is also preferable that the rate is lower than the above-exemplified value.
- the transmission T400 at a wavelength of 400 nm is preferably 68.0% or more, more preferably 70.0% or more, and further. 71.0% or more, 72.0% or more, 73.0% or more, 74.0% or more, 75.0% or more, 76.0% or more, 77.0% or more, 78.0% or more, It is more preferable in the order of 79.0% or more and 80.0% or more.
- the transmittance T400 at a wavelength of 400 nm can be, for example, 98.0% or less, 97.0% or less, or 96.0% or less. Since it can be said that a higher rate means better visible light transmittance, it is also preferable to exceed the above-exemplified value.
- the half value is preferably 650 nm or less, and further, 647 nm or less as the transmittance characteristic in terms of thickness 0.21 mm.
- the transmittance characteristic in terms of thickness 0.11 mm is preferably 600 nm or more, and more preferably 610 nm or more, 613 nm or more, 615 nm or more, 617 nm or more, 620 nm or more, 623 nm or more, 625 nm or more, and 628 nm or more.
- the transmittance T1200 at a wavelength of 1200 nm is preferably 42.0% or less, and further 41.0% or less, 40.0% or less, 39 as the transmittance characteristic in terms of thickness 0.21 mm. 0.0% or less, 38.5% or less, 38.0% or less, 37.5% or less, 37.0% or less, 36.5% or less, 36.0% or less, 35.5% or less, 35.0 It is more preferable in the order of% or less.
- the transmittance T1200 at a wavelength of 1200 nm can be, for example, 10.0% or more, 12.0% or more, or 14.0% or more.
- the transmission T400 at a wavelength of 400 nm is preferably 68.0% or more, more preferably 70.0% or more, and further. 71.0% or more, 72.0% or more, 73.0% or more, 74.0% or more, 75.0% or more, 76.0% or more, 77.0% or more, 78.0% or more, It is more preferable in the order of 79.0% or more and 80.0% or more.
- the transmittance T400 at a wavelength of 400 nm can be, for example, 98.0% or less, 97.0% or less, or 96.0% or less. Since it can be said that a higher rate means better visible light transmittance, it is also preferable to exceed the above-exemplified value.
- the above transmittance characteristics are values obtained by the following methods. Glass samples are processed to have planes parallel to each other and optically polished, and the external transmittance at a wavelength of 200 to 1200 nm is measured. The external transmittance also includes the reflection loss of light rays on the sample surface.
- the spectral transmittance B / A is calculated, where the intensity of the light beam perpendicularly incident on one plane that has been optically polished is the intensity A and the intensity of the light beam emitted from the other plane is the intensity B.
- the wavelength at which the spectral transmittance is 50% at a wavelength of 600 nm or more is defined as the half value ⁇ T 50.
- the spectral transmittance at a wavelength of 400 nm is T400, and the spectral transmittance at a wavelength of 1200 nm is T1200. If the glass to be measured is not a glass of a conversion thickness, the transmittance at each wavelength ⁇ is converted by the following formula, where d is the thickness of the glass, and the transmittance obtained by the conversion is calculated. From the characteristics, the converted values of the half values ⁇ T 50, T 400 and T 1200 can be obtained.
- T ( ⁇ ) (1-R ( ⁇ )) 2 ⁇ exp (log e ((T 0 ( ⁇ ) / 100) / (1-R ( ⁇ )) 2 ) ⁇ d / d 0 ) ⁇ 100
- T ( ⁇ ) converted transmission rate (%) at wavelength ⁇
- T 0 ( ⁇ ) measured transmission rate (%) at wavelength ⁇
- d glass thickness (mm)
- d 0 converted thickness (Mm)
- R ( ⁇ ) ((n ( ⁇ ) -1) / (n ( ⁇ ) +1)) 2 is the reflectance at wavelength ⁇
- n ( ⁇ ) the refractive index at wavelength ⁇ . is there.
- the glass can exhibit excellent weather resistance by having the composition described above.
- the evaluation result of the weather resistance evaluated by the method described in Examples described later can be used as an index, and the evaluation result is preferably ⁇ or ⁇ , and is preferably ⁇ . More preferred.
- the glass can also exhibit excellent meltability by having the composition described above.
- the evaluation result of the meltability evaluated by the method described in Examples described later can be used as an index, and the evaluation result is preferably ⁇ .
- the glass transition temperature of the glass is not particularly limited, but from the viewpoint of imparting processability and / or heat resistance in a subsequent process, Tg is preferably 300 ° C. or higher, and more preferably 310 ° C. Above, 320 ° C. or higher, 330 ° C. or higher, 340 ° C. or higher, and 350 ° C. or higher are more preferable. On the other hand, from the viewpoint of reducing the burden on the annealing furnace and the molding apparatus, the Tg is preferably 500 ° C. or lower, and further, 490 ° C. or lower, 480 ° C. or lower, 470 ° C.
- Tm is preferably 870 ° C. or lower, and further, 860 ° C. or lower, 850 ° C. or lower, 840 ° C.
- the temperature is more preferably °C or less, 780 °C or less, 770 °C or less, 760 °C or less, 750 °C or less.
- the light weight of the near-infrared cut filter is preferable because it leads to the weight reduction of the element or device in which the filter is incorporated.
- the specific gravity of the glass is preferably 3.50 or less, and further, 3.45 or less, 3.40 or less, 3.35 or less, 3.30 or less, 3.25 or less, 3. It is more preferably 20 or less, 3.15 or less, 3.10 or less, and 3.05 or less in that order.
- the specific gravity can be, for example, 2.5 or more or 2.6 or more, but from the above viewpoint, it is preferable that the specific density is low, and therefore it is also preferable that the specific gravity is lower than the value exemplified here.
- the glass can be obtained by blending, melting, and molding various glass raw materials.
- the description described later can also be referred to.
- the near-infrared absorbing glass is suitable as a glass for a near-infrared cut filter. Further, the near-infrared absorbing glass can be applied to optical elements (lenses, etc.) other than the near-infrared cut filter, and can be applied to various glass products and various deformations. It is possible.
- Near infrared cut filter One aspect of the present invention relates to a near-infrared cut filter (hereinafter, also simply referred to as “filter”) made of the near-infrared absorbing glass.
- the glass constituting the above filter is as described above.
- the molten glass is appropriately used with glass raw materials such as phosphates, oxides, carbonates, nitrates, sulfates, and fluorides, and the raw materials are weighed and mixed so as to have a desired composition, and then a platinum crucible or the like is used. It is melted in a melting container at, for example, 800 ° C. to 1000 ° C. At that time, a lid made of platinum or the like can be used to suppress the volatilization of the volatile component. Further, the melting can be performed in the atmosphere, and in order to suppress the change in the valence of Cu, an oxygen atmosphere can be created or oxygen can be bubbled in the molten glass.
- the molten glass becomes a homogenized molten glass in which bubbles are reduced (preferably free of bubbles) by stirring and clarification.
- the glass After stirring and clarifying the molten glass, the glass is poured out and molded into a desired shape.
- a glass forming method known methods such as casting, pipe outflow, roll, and pressing can be used.
- the molded glass is transferred to an annealing furnace preheated near the transition point of the glass and slowly cooled to room temperature. In this way, the near-infrared cut filter can be manufactured.
- a mold composed of a flat and horizontal bottom surface, a pair of side walls that oppose each other in parallel across the bottom surface, and a weir plate that closes one opening located between the pair of side walls is prepared.
- molten glass is cast into this mold at a constant outflow rate.
- the cast molten glass spreads in the mold and is formed into a glass plate regulated to a certain width by a pair of side walls.
- the molded glass plate is continuously pulled out from the opening of the mold.
- molding conditions such as the shape and dimensions of the mold and the outflow speed of the molten glass, a large-sized and thick glass block can be molded.
- the molded glass molded body is transferred to an annealing furnace previously heated near the glass transition temperature and slowly cooled to room temperature.
- the glass molded body whose strain has been removed by slow cooling is subjected to machining such as slicing, grinding, and polishing.
- machining such as slicing, grinding, and polishing.
- a near-infrared cut filter having a shape suitable for various purposes such as a plate shape and a lens shape.
- a method of molding a preform made of the above glass, heating and softening the preform, and press-molding (particularly, a precision press for press-molding the final product without performing machining such as grinding or polishing on the optical functional surface). Molding method) etc.
- An optical multilayer film may be formed on the surface of the filter, if necessary.
- the near-infrared cut filter can have both excellent near-infrared cut ability and high visible light transmittance. According to such a near-infrared cut filter, the color sensitivity of the semiconductor image sensor can be satisfactorily corrected.
- the near-infrared cut filter can be applied to an imaging device by combining it with a semiconductor image sensor.
- a semiconductor image sensor is a device in which a semiconductor image sensor such as a CCD or CMOS is mounted in a package, and a light receiving portion is covered with a translucent member.
- the translucent member can also serve as a near-infrared cut filter, or the translucent member can be separate from the near-infrared cut filter.
- the image pickup device may also be provided with an optical element such as a lens or a prism for forming an image of a subject on a light receiving surface of a semiconductor image sensor.
- an optical element such as a lens or a prism for forming an image of a subject on a light receiving surface of a semiconductor image sensor.
- the near-infrared cut filter it is possible to provide an image pickup apparatus in which color sensitivity correction is performed well and an image having excellent image quality can be obtained.
- the near-infrared cut filter can be a near-infrared cut filter having a thickness of 0.25 mm or less.
- the thickness of the camera of the image sensor has been remarkably decreasing, and along with this, it is desired that the near-infrared cut filter also exhibits the performance with a thinner thickness.
- the above-mentioned near-infrared cut filter is also suitable.
- the thickness of the near infrared cut filter is 0.24 mm or less, 0.23 mm or less, 0.22 mm or less, 0.21 mm or less, 0.20 mm or less, 0.19 mm or less, 0.18 mm or less, 0.17 mm or less, 0.
- the thickness of the near-infrared cut filter can be, for example, 0.21 mm or 0.11 mm. Further, the thickness of the near-infrared cut filter can be, for example, 0.50 or more, but is not limited to this.
- the “thickness” refers to the thickness of the sample in the region where the transmittance is measured, and can be measured by a thickness gauge, a micrometer, or the like. For example, the thickness of the substantially central portion of the position through which the transmitted light passes may be measured, or the thickness of a plurality of points in the spot of the transmitted light may be measured and the average value thereof may be taken.
- the value calculated as "thickness x Cu concentration" is 0.2000 mol / m from the viewpoint of making the near-infrared cut filter exhibiting even more excellent near-infrared cutting ability. It is preferably 2 or more, and more preferably 0.2100 mol / m 2 or more, 0.2200 mol / m 2 or more, 0.2300 mol / m 2 or more, 0.2400 mol / m 2 or more, 0.2500 mol / m 2 or more.
- the value calculated as "thickness x Cu concentration" is preferably 1.000 mol / m 2 or less, and further 0.
- Thickness x Cu concentration (Specific gravity of the composition) / (Molecular weight of the composition) ⁇ (Cation% of Cu ion / 100) ⁇ d / 10 ⁇ 10 4 The unit is mol / m 2 , and d is the thickness (mm).
- the calculation method for (the molecular weight of the composition) of the above formula will be described.
- (Molecular weight of the composition) is for all the components that make up the composition.
- a calculation method will be described for the above (molecular weight of each component based on the cation).
- (Molecular weight of each component based on cation) (Atomic weight of the element forming the cation) + (Atomic weight of oxygen x Coefficient according to valence)
- the coefficients according to the valence are as follows. If the formal value is +1 then the coefficient is 0.5 If the formal value is +2, the coefficient is 1.0. If the formal value is +3, the coefficient is 1.5. If the formal value is +4, the coefficient is 2.0. If the formal value is +5, the coefficient is 2.5. If the formal value is +6, the coefficient is 3.0.
- the above description regarding glass I and glass II can be referred to. Further, regarding the physical properties of the near-infrared cut filter, the above-mentioned description regarding the near-infrared absorbing glass can be referred to.
- Examples 1 to 81, Comparative Examples A to F As a glass raw material, phosphate, fluoride, carbonate, nitrate, oxide, etc. are weighed and mixed so that 150 g to 300 g of glass having the composition shown in Table 1 can be obtained, and the mixture is placed in a platinum crucible or a quartz crucible. The mixture was charged, melted at 800 ° C. to 1000 ° C. for 60 to 180 minutes, stirred to defoam and homogenize, and then poured into a preheated mold to form a predetermined shape. The obtained glass compact was transferred to an annealing furnace heated to near the glass transition temperature and slowly cooled to room temperature. A test piece was cut out from the obtained glass, and both sides were mirror-polished to a thickness of about 0.2 mm, and then various evaluations were performed by the following methods.
- ⁇ Weather resistance> Each test piece was kept in a constant temperature and humidity chamber having a temperature of 85 ° C. and a relative humidity of 85% for 168 hours. After that, each test piece was visually evaluated under a fluorescent lamp. From the evaluation results, the weather resistance was evaluated according to the following criteria. ⁇ : No deterioration is observed on the surface. ⁇ : Spiders were found on the surface, but there was no deliquescent. ⁇ : Deliquescent.
- Table 1 Table 1-1 to Table 1-6
- Table 2 Table 2-1 to Table 2-6)
- Table 3 Table 3-1 to Table 3-6
- the unit of (total) content of cations is cation%
- the unit of (total) content of anions is anion%.
- glass raw material 150 g of glass having a composition of phosphate, fluoride, carbonate, nitrate, oxide, etc., and 0.080% by mass of Sb 2 O 3 in the composition of Example 64 in Table 1 in an externally divided manner. Weigh and mix to obtain ⁇ 300 g, put into a platinum crucible or quartz crucible, melt under the same melting conditions as in Example 64, stir to defoam, homogenize, and then preheat the mold. It was poured into a glass and molded into a predetermined shape. The obtained glass compact was transferred to an annealing furnace heated to near the glass transition temperature and slowly cooled to room temperature.
- a test piece was cut out from the obtained glass, and both sides were mirror-polished to a thickness of about 0.2 mm, and then the transmittance characteristics were evaluated by the above method.
- the transmittance T1200 at a wavelength of 1200 nm was 27.9% and the transmittance T400 at a wavelength of 400 nm was 87.4% as values at a thickness of 0.11 mm (converted). From the comparison between the above evaluation result and the evaluation result of Example 64, it can be confirmed that the addition of Sb 2 O 3 can suppress the coloring and increase the visible light transmittance.
- the constituent ions include one or more ions selected from the group consisting of P ion, Cu ion, O ion, Li ion, Na ion and K ion, and Mg ion, Ca ion, Sr ion and It contains at least one or more ions selected from the group consisting of Ba ions, and in the glass composition indicated by cation%, the Cu ion content is 15.0 cation% or less, and the P ion content is 55.0.
- the cation ratio of the total content of Al ion and P ion to the total content of Mg ion, Ca ion, Sr ion, Ba ion, Zn ion and Cu ion ((Al ion + P ion) / ( Mg ion + Ca ion + Sr ion + Ba ion + Zn ion + Cu ion)) is 5.300 or less, and the total content of Mg ion, Ca ion, Sr ion and Ba ion with respect to the total content of Li ion, Na ion and K ion.
- the O ion content is 85.0 anion% or more, and the ratio of the O ion content to the P ion content (O ion / P ion) is 3.
- Near infrared absorbing glass of 300 or more is provided.
- the above glass can be a near-infrared absorbing glass having excellent near-infrared ray cutting ability, high visible light transmittance, and excellent weather resistance and melting property.
- the content of P ions can be 30.0 cation% or more and 50.0 cation% or less in the glass composition indicated by cation% of the glass.
- the Li ion content can be 10.0 cation% or more in the glass composition indicated by cation% of the glass.
- the Cu ion content can be 2.1 cation% or more and 15.0 cation% or less in the glass composition indicated by cation% of the glass.
- the above ratio (O ion / P ion) can be 3.400 or more.
- the ratio of Zn ions to the total content of Mg ions, Ca ions, Sr ions, Ba ions and Zn ions in the glass composition of the glass in terms of cation% can be 0.600 or less.
- the content of O ions can be 90.0% or less in the glass composition indicated by the anion% of the glass.
- the glass can have a transmittance T1200 at a wavelength of 1200 nm of 42.0% or less as a transmittance characteristic in terms of a thickness of 0.11 mm.
- the glass can have a transmittance T400 of 68.0% or more at a wavelength of 400 nm as a transmittance characteristic in terms of a thickness of 0.11 mm.
- the glass can have a transmittance T1200 at a wavelength of 1200 nm of 42.0% or less as a transmittance characteristic in terms of thickness 0.21 mm.
- the glass can have a transmittance T400 of 68.0% or more at a wavelength of 400 nm as a transmittance characteristic in terms of thickness 0.21 mm.
- a near-infrared cut filter made of the above-mentioned near-infrared absorbing glass is provided.
- the thickness of the near-infrared cut filter can be 0.25 mm or less.
- the near-infrared cut filter can have a wavelength in the range of 600 nm to 650 nm, which has a transmittance of 50% at a wavelength of 600 nm or more, as a transmittance characteristic in terms of thickness of 0.11 mm.
- the near-infrared cut filter can have a transmittance T1200 at a wavelength of 1200 nm of 42.0% or less as a transmittance characteristic in terms of a thickness of 0.11 mm.
- the near-infrared cut filter can have a transmittance T400 at a wavelength of 400 nm of 68.0% or more as a transmittance characteristic in terms of a thickness of 0.11 mm.
- the near-infrared cut filter can have a wavelength in the range of 600 nm to 650 nm, which has a transmittance of 50% at a wavelength of 600 nm or more, as a transmittance characteristic in terms of thickness of 0.21 mm.
- the near-infrared cut filter can have a transmittance T1200 at a wavelength of 1200 nm of 42.0% or less as a transmittance characteristic in terms of a thickness of 0.21 mm.
- the near-infrared cut filter can have a transmittance T400 at a wavelength of 400 nm of 68.0% or more as a transmittance characteristic in terms of thickness 0.21 mm.
- the near-infrared absorbing glass according to one aspect of the present invention can be obtained by adjusting the composition described in the specification with respect to the above-exemplified glass composition.
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Abstract
Description
(1)従来と比べて少ないCu量でも所望の半値と十分な近赤外線カット能力が得られるガラス組成。
(2)熔解時のCu+の生成を抑制するためには、ガラスをより低温で熔解・成形することが有効であるため、従来よりも原料バッチの熔解性に優れたガラス組成。
構成イオンとして、
Pイオン、
Cuイオン、
Oイオン、
Liイオン、NaイオンおよびKイオンからなる群から選ばれる1種以上のイオン、ならびに、
Mgイオン、Caイオン、SrイオンおよびBaイオンからなる群から選ばれる1種以上のイオン、
を少なくとも含み、
カチオン%表示のガラス組成において、
Cuイオンの含有量が15.0カチオン%以下であり、
Pイオンの含有量が55.0カチオン%以下であり、
Mgイオン、Caイオン、Srイオン、Baイオン、ZnイオンおよびCuイオンの合計含有量に対するAlイオンとPイオンとの合計含有量のカチオン比((Alイオン+Pイオン)/(Mgイオン+Caイオン+Srイオン+Baイオン+Znイオン+Cuイオン))が5.300以下であり、
Liイオン、NaイオンおよびKイオンの合計含有量に対するMgイオン、Caイオン、SrイオンおよびBaイオンの合計含有量のカチオン比((Mgイオン+Caイオン+Srイオン+Baイオン)/(Liイオン+Naイオン+Kイオン))が0.100以上であり、
CuイオンおよびPイオンを除くカチオン類の平均価数が1.500未満であり、
アニオン%表示のガラス組成において、
Oイオンの含有量が85.0アニオン%以上であり、かつ
Pイオンの含有量に対するOイオンの含有量の比率(Oイオン/Pイオン)が3.300以上である、近赤外線吸収ガラス。(以下、単に「ガラス」とも記載する。)、
に関する。
本発明および本明細書において、近赤外線吸収ガラスとは、少なくとも近近赤外線の波長域(波長700~1200nm)の全領域または一部の波長の光を吸収する性質を有するガラスである。また、本発明の一態様にかかる近赤外線吸収ガラスは、構成イオンとしてOイオン(酸素イオン)を含むため、酸化物ガラスであることができる。酸化物ガラスとは、ガラスの主要ネットワーク形成成分が酸化物であるガラスである。更に、本発明の一態様にかかる近赤外線吸収ガラスは、構成イオンとしてOイオン(酸素イオン)とともにPイオン(リンイオン)を含むため、リン酸塩ガラスであることができる。
本発明および本明細書において、カチオン類(カチオン成分)の含有量および合計含有量は特記しない限りカチオン%で表示するものとし、アニオン類(アニオン成分)の含有量および合計含有量は特記しないアニオン%で表示するものとする。
ここで、「カチオン%」とは、「(注目するカチオンの個数/ガラス成分のカチオンの総数)×100」で算出される値であって、注目するカチオン量のカチオンの総量に対するモル百分率を意味する。
また、「アニオン%」とは、「(注目するアニオンの個数/ガラス成分のアニオンの総数)×100」で算出される値であって、注目するアニオン量のアニオンの総量に対するモル百分率を意味する。
カチオン類同士の含有量のモル比は、注目するカチオンのカチオン%表示による含有量の比に等しく、アニオン類同士の含有量のモル比は、注目するアニオンのアニオン%表示による含有量の比に等しい。
カチオンの含有量とアニオンの含有量のモル比は、すべてのカチオン類とすべてのアニオン類の総量を100モル%としたときの注目する成分同士の含有量(モル%表示)の比率である。
各成分の含有量は、公知の方法、例えば、誘導結合プラズマ発光分光分析法(ICP-AES)、誘導結合プラズマ質量分析法(ICP-MS)、イオンクロマトグラフィ法等により、ガラス中に含まれる元素の含有率(元素の質量%)を定量することができる。この元素の含有率(元素の質量%)を原子量で除することにより、モル%表示の各元素の含有量を求めることができ、その値からカチオン%とアニオン%を求めることができる。
また、本発明および本明細書において、構成成分の含有量が0%または含まないもしくは導入しないとは、この構成成分を実質的に含まないことを意味し、この構成成分が不可避的不純物レベルで含まれることは許容される。不可避的不純物レベルとは、例えば、0.01%未満であることを意味する。
Pイオンは、ガラスのネットワーク形成成分である。上記ガラスのPイオン含有量は、耐候性向上および熔解性向上の観点から、55.0%以下であり、53.0%以下であることが好ましく、51.0%以下であることがより好ましく、50.0%以下であることが更に好ましく、49.0%以下であることが一層好ましく、48.0%以下であることがより一層好ましく、47.0%以下であることが更に一層好ましく、46.0%以下であることがなお一層好ましく、45.0%以下であることがなおより一層好ましく、44.0%以下であることがなお更により一層好ましい。上記ガラスは構成イオンとしてPイオンを含むため、Pイオン含有量は、0%超である。ガラス熔解時の耐失透性の向上とガラスの機械的強度向上の観点からは、Pイオン含有量は、30.0%以上であることが好ましく、32.0%以上であることがより好ましく、34.0%以上であることが更に好ましく、36.0%以上であることが一層好ましく、38.0%以上であることがより一層好ましく、39.0%以上であることが更に一層好ましく、40.0%以上であることがなお一層好ましく、41.0%以上であることがなお更に一層好ましい。Pイオンの形式価数は、+5である。
詳細を後述するように、上記ガラスは、一形態では、厚みが0.25mm以下の近赤外線カットフィルタ用ガラスとして使用することができる。
上記厚みの範囲の中でも厚みが比較的薄い近赤外線カットフィルタに適するガラス(以下、「ガラスI」とも記載する。)としては、Cuイオン含有量は、1.5%以上であることが好ましく、1.7%以上、1.9%以上、2.1%以上、2.3%以上、2.5%以上、2.7%以上、2.9%以上、3.1%以上、3.3%以上、3.5%以上、3.7%以上、3.9%以上、4.1%以上、4.5%以上、4.7%以上、4.9%以上、5.1%以上の順により好ましい。
また、かかる近赤外線カットフィルタにおいて可視光透過率を更に高める観点からは、ガラスIのCuイオン含有量は、15.0%以下であることが好ましく、13.0%以下、11.0%以下、10.0%以下、9.0%以下、8.5%以下、8.0%以下、7.5%以下、7.0%以下、6.5%以下、6.0%以下の順により好ましい。
上記の好ましい範囲に、(0.11/d)を乗ずることにより、所望の厚みをもつ近赤外線カットフィルタに適するガラスに含有すべきCuイオンの好ましい値を求めることができる。d はCuイオンの好ましい値を求めたい厚みであり、単位はmmである。
また、0.25mm以下の範囲の厚みの中でも厚みが比較的厚い近赤外線カットフィルタに適するガラス(以下、「ガラスII」とも記載する。)については、一形態では、Cuイオンの好ましい範囲は、上記の好ましい範囲に、(0.11/d)を乗ずることにより求めることができる。
また、ガラスIIについては、一形態では、Cuイオン含有量は、0.5%以上であることが好ましく、0.7%以上、0.9%以上、1.1%以上、1.3%以上、1.5%以上、1.7%以上、1.9%以上、2.1%以上、2.3%以上、2.5%以上の順により好ましい。また、かかる近赤外線カットフィルタにおいて可視光透過率を更に高める観点からは、一形態では、ガラスIIのCuイオン含有量は、10.0%以下であることが好ましく、9.0%以下、8.5%以下、8.0%以下、7.5%以下、7.0%以下、6.5%以下、6.0%以下、5.5%以下、5.0%以下、4.5%以下、4.0%以下、3.5%以下の順により好ましい。Cuイオンの形式価数は、+2である。
Mgイオン、Caイオン、SrイオンおよびBaイオンの合計含有量は、上記の観点および熔解性の更なる向上の観点からは、20.0%以下であることが好ましく、19.0%以下であることがより好ましく、18.0%以下であることが更に好ましく、17.5%以下であることが一層好ましく、17.0%以下であることがより好ましく、16.5%以下であることが更に好ましく、16.0%以下であることが更により一層好ましく、15.5%以下であることがなお一層好ましく、15.0%以下であることがなおより一層好ましく、14.5%以下であることがなお更に一層好ましく、14.0%以下であることがなお更により好ましく、更には、13.5%以下、13.0%以下、12.5%以下、12.0%以下、11.0%以下、10.5%以下、10.0%以下の順に更により一層好ましい。また、Mgイオン、Caイオン、SrイオンおよびBaイオンの合計含有量は、液相温度の低下抑制、耐候性向上の観点からは、3.0%以上であることが好ましく、4.0%以上であることがより好ましく、4.5%以上であることが更に好ましく、5.0%以上であることが一層好ましく、5.5%以上であることがより一層好ましく、6.0%以上であることが更に一層好ましく、6.5%以上であることが更により一層好ましく、7.0%以上であることがなお一層好ましく、7.5%以上であることがなお更により好ましく、更には、8.0%以上、8.5%以上、9.0%以上の順になおより一層好ましい。
また、ガラスの熔解温度が高くなることによってCu+が生成しやすくなり可視光透過率が低下するため、上記カチオン比は上記範囲にすることが好ましい。
Tiイオン含有量は、0%、0%以上または0%超であることができ、3.0%以下であることが好ましく、2.0%以下であることがより好ましく、1.0%以下であることが更に好ましく、0.5%以下であることが一層好ましい。Tiイオンの形式価数は、+4である。
Zrイオン含有量は、0%、0%以上または0%超であることができ、3.0%以下であることが好ましく、2.0%以下であることがより好ましく、1.0%以下であることが更に好ましく、0.5%以下であることが一層好ましい。Zrイオンの形式価数は、+4である。
Nbイオン含有量は、0%、0%以上または0%超であることができ、3.0%以下であることが好ましく、2.0%以下であることがより好ましく、1.0%以下であることが更に好ましく、0.5%以下であることが一層好ましい。Nbイオンの形式価数は、+5である。
Wイオン含有量は、0%、0%以上または0%超であることができ、3.0%以下であることが好ましく、2.0%以下であることがより好ましく、1.0%以下であることが更に好ましく、0.5%以下であることが一層好ましい。Wイオンの形式価数は、+6である。
Biイオン含有量は、0%、0%以上または0%超であることができ、3.0%以下であることが好ましく、2.0%以下であることがより好ましく、1.0%以下であることが更に好ましく、0.5%以下であることが一層好ましい。Biイオンの形式価数は、+3である。
上記ガラスは構成イオンとしてOイオンを含む。Oイオン含有量は、ガラスの熔融時の均質化を容易にし、生産性を高める観点から、85.0%以上であり、90.0%以上であることが好ましく、95.0%以上であることがより好ましく、98.0%以上であることが更に好ましく、99.0%以上であることが一層好ましい。特にガラス溶融時の揮発を抑え、生産性を高めると共に製造時の有害ガスの発生を抑える観点からは、Oイオンの含有量が100%であることが好ましい。尚、Oイオンの形式価数は、-2である。
Sn(SnO2)、Ce(CeO2)は、Sb(Sb2O3)と比較し、清澄効果が小さい。これら清澄剤は、多量に添加するとガラスの着色が強まる傾向がある。したがって、清澄剤を添加する場合は、添加による着色の影響を考慮しつつ、Sb(Sb2O3)を添加することが好ましい。
(透過率特性)
上記ガラスは、近赤外線カットフィルタ用ガラスとして好適である。近赤外線カット能力については、波長600nm以上で分光透過率が50%になる波長である半値を指標とすることができ、波長1200nmにおける透過率T1200を指標とすることもできる。
また、上記ガラスは、高い可視光透過率を示すこともできる。可視光透過率については、波長400nmにおける透過率T400を指標とすることができる。
上記ガラスは、詳細を後述するように、一形態では、厚みが0.25mm以下の近赤外線カットフィルタ用ガラスとして使用することができる。
上記厚みの範囲の中でも厚みが比較的薄い近赤外線カットフィルタに適するガラス(ガラスI)としては、厚み0.11mm換算の透過率特性として、半値は650nm以下が好ましく、更には、647nm以下、645nm以下、643nm以下、641nm以下、640nm以下、639nm以下、638nm以下の順により好ましい。
ガラスIについて、厚み0.11mm換算の透過率特性として、半値は600nm以上が好ましく、610nm以上、613nm以上、615nm以上、617nm以上、620nm以上、623nm以上、625nm以上、628nm以上の順により好ましい。
ガラスIについて、厚み0.11mm換算の透過率特性として、波長1200nmにおける透過率T1200は、42.0%以下であることが好ましく、更には、41.0%以下、40.0%以下、39.0%以下、38.5%以下、38.0%以下、37.5%以下、37.0%以下、36.5%以下、36.0%以下、35.5%以下、35.0%以下の順により好ましい。
ガラスIについて、厚み0.11mm換算の透過率特性として、波長1200nmにおける透過率T1200は、例えば10.0%以上、12.0%以上または14.0%以上であることができるが、かかる透過率がより低いことは近赤外線カット能力により優れることを意味するということができるため、上記例示した値を下回ることも好ましい。
また、ガラスIとしては、厚み0.11mm換算の透過率特性として、波長400nmにおける透過率T400は、68.0%以上であることが好ましく、70.0%以上であることがより好ましく、更には、71.0%以上、72.0%以上、73.0%以上、74.0%以上、75.0%以上、76.0%以上、77.0%以上、78.0%以上、79.0%以上、80.0%以上、の順により好ましい。
ガラスIについて、厚み0.11mm換算の透過率特性として、波長400nmにおける透過率T400は、例えば98.0%以下、97.0%以下または96.0%以下であることができるが、かかる透過率がより高いことは可視光透過性により優れることを意味するということができるため、上記例示した値を上回ることも好ましい。
また、上記厚みの範囲の中でも厚みが比較的厚い近赤外線カットフィルタに適するガラス(ガラスII)としては、厚み0.21mm換算の透過率特性として、半値は650nm以下が好ましく、更には、647nm以下、645nm以下、643nm以下、641nm以下、640nm以下、639nm以下、638nm以下の順により好ましい。
ガラスIIについて、厚み0.11mm換算の透過率特性として、半値は600nm以上が好ましく、610nm以上、613nm以上、615nm以上、617nm以上、620nm以上、623nm以上、625nm以上、628nm以上の順により好ましい。
ガラスIIについて、厚み0.21mm換算の透過率特性として、波長1200nmにおける透過率T1200は、42.0%以下であることが好ましく、更には、41.0%以下、40.0%以下、39.0%以下、38.5%以下、38.0%以下、37.5%以下、37.0%以下、36.5%以下、36.0%以下、35.5%以下、35.0%以下の順により好ましい。
ガラスIIについて、厚み0.21mm換算の透過率特性として、波長1200nmにおける透過率T1200は、例えば10.0%以上、12.0%以上または14.0%以上であることができるが、かかる透過率がより低いことは近赤外線カット能力により優れることを意味するということができるため、上記例示した値を下回ることも好ましい。
また、ガラスIIとしては、厚み0.21mm換算の透過率特性として、波長400nmにおける透過率T400は、68.0%以上であることが好ましく、70.0%以上であることがより好ましく、更には、71.0%以上、72.0%以上、73.0%以上、74.0%以上、75.0%以上、76.0%以上、77.0%以上、78.0%以上、79.0%以上、80.0%以上、の順により好ましい。
ガラスIIについて、厚み0.21mm換算の透過率特性として、波長400nmにおける透過率T400は、例えば98.0%以下、97.0%以下または96.0%以下であることができるが、かかる透過率がより高いことは可視光透過性により優れることを意味するということができるため、上記例示した値を上回ることも好ましい。
ガラスサンプルを、互いに平行かつ光学研磨された平面を有するように加工し、波長200~1200nmにおける外部透過率を測定する。尚、外部透過率には、試料表面における光線の反射損失も含まれる。
光学研磨された一方の平面に垂直に入射する光線の強度を強度Aとし、他方の平面から出射する光線の強度を強度Bとして、分光透過率B/Aを算出する。波長600nm以上で分光透過率が50%になる波長を半値λT50とする。波長400nmにおける分光透過率をT400、また、波長1200nmにおける分光透過率をT1200とする。また、測定対象のガラスが換算される厚みのガラスでない場合には、そのガラスの厚みをdとして、以下の式によって、各波長λにおける透過率を換算するものとし、換算により得られた透過率特性から、半値λT50、T400およびT1200の換算値を求めることができる。
上記ガラスは、先に説明した組成を有することにより、優れた耐候性を示すことができる。耐候性については、例えば、後述の実施例に記載の方法により評価される耐候性の評価結果を指標とすることができ、かかる評価結果が◎または〇であることが好ましく、◎であることがより好ましい。
上記ガラスは、先に説明した組成を有することにより、優れた熔解性を示すこともできる。熔解性については、例えば、後述の実施例に記載の方法により評価される熔解性の評価結果を指標とすることができ、かかる評価結果が〇であることが好ましい。
上記ガラスのガラス転移温度は、特に限定されないが、加工性および/または後工程での耐熱性を付与する等の観点からは、Tgは、300℃以上であることが好ましく、さらには、310℃以上、320℃以上、330℃以上、340℃以上、350℃以上の順により好ましい。
一方、アニール炉や成形装置への負担軽減の観点からは、Tgは、500℃以下であることが好ましく、更には、490℃以下、480℃以下、470℃以下、460℃以下、450℃以下、440℃以下、430℃以下、420℃以下、410℃以下、400℃以下、390℃以下、の順により好ましい。
上記ガラスの吸熱反応の収束する温度Tmは、特に限定されないが、Tmが低いほど熔解性が良好になる傾向がある。また、熔解性が良好になるほどガラスの可視光透過率を高めることができる傾向がある。これらの観点からは、Tmは、870℃以下であることが好ましく、更には、860℃以下、850℃以下、840℃以下、830℃以下、820℃以下、810℃以下、800℃以下、790℃以下、780℃以下、770℃以下、760℃以下、750℃以下の順により好ましい。
近赤外線カットフィルタが軽量であることは、このフィルタが組み込まれる素子や装置の軽量化につながるため好ましい。この点から、上記ガラスの比重は、3.50以下であることが好ましく、更には、3.45以下、3.40以下、3.35以下、3.30以下、3.25以下、3.20以下、3.15以下、3.10以下、3.05以下の順により好ましい。
比重は、例えば2.5以上または2.6以上であることができるが、上記観点から比重が低いことは好ましいため、ここに例示した値を下回ることも好ましい。
上記ガラスは、各種ガラス原料を調合、熔融、成形することにより得ることができる。製造方法については、後述の記載も参照できる。
本発明の一態様は、上記近赤外線吸収ガラスからなる近赤外線カットフィルタ(以下、単に「フィルタ」とも記載する。)に関する。
また、より高い可視光透過率を示す近赤外線カットフィルタとする観点からは、「厚み×Cu濃度」として算出される値が、1.000mol/m2以下であることが好ましく、更には、0.9800mol/m2以下、0.9600mol/m2以下、0.9400mol/m2以下、0.9200mol/m2以下、0.9000mol/m2以下、0.8800mol/m2以下、0.8600mol/m2以下、0.8400mol/m2以下、0.8200mol/m2以下、0.8000mol/m2以下、0.7800mol/m2以下、0.7600mol/m2以下、0.7400mol/m2以下、0.7200mol/m2以下、0.7000mol/m2以下、0.6800mol/m2以下、0.6600mol/m2以下、0.6400mol/m2以下、0.6200mol/m2以下、0.6000mol/m2以下、0.5800mol/m2以下、0.5600mol/m2以下、0.5400mol/m2以下、0.5200mol/m2以下、0.5000mol/m2以下、0.4800mol/m2以下、0.4600mol/m2以下、0.4800mol/m2以下、0.4200mol/m2以下、0.4100mol/m2以下、0.4000mol/m2以下、0.3900mol/m2以下、0.3800mol/m2以下、0.3700mol/m2以下、0.3600mol/m2以下、0.3500mol/m2以下の順により好ましい。
「厚み×Cu濃度」=
(その組成の比重)/(その組成の分子量)×(Cuイオンのカチオン%/100)
×d/10×104
単位は、mol/m2であり、dは厚み(mm)である。
(その組成の分子量)は、その組成を構成する全ての成分について、
(カチオン基準とする各成分の分子量)×(各成分のカチオン%/100)
の総和をとった値で、単位はg/molである。
更に、上記の(カチオン基準とする各成分の分子量)について、計算方法を説明する。 (カチオン基準とする各成分の分子量)=
(そのカチオンを成す元素の原子量)+(酸素の原子量×価数に応じた係数)
形式価数+1ならば、係数は0.5
形式価数+2ならば、係数は1.0
形式価数+3ならば、係数は1.5
形式価数+4ならば、係数は2.0
形式価数+5ならば、係数は2.5
形式価数+6ならば、係数は3.0
ガラス原料として、燐酸塩、フッ化物、炭酸塩、硝酸塩、酸化物等を、表1に示されている組成のガラスが150g~300g得られるよう秤量混合し、白金製坩堝中または石英坩堝中に投入し、800℃~1000℃で、60分~180分熔解し、撹拌して脱泡、均質化を行った後、予熱した金型に流し出し、所定形状に成形した。得られたガラス成形体をガラス転移温度付近に加熱したアニール炉に移し、室温まで徐冷した。得られたガラスからテストピースを切り出し、両面を鏡面研磨して厚み約0.2mmとした後、以下の方法により各種評価を行った。
<透過率特性>
各テストピースの波長200~1200nmの透過率を、分光光度計を使用して測定した。測定結果から、厚み0.11mm換算または厚み0.21mm換算の値として、半値(単位:nm)、波長1200nmにおける透過率T1200(単位:%)および波長400nmにおける透過率T400(単位:%)を求めた。
Rigaku社製の示差走査熱量分析装置(DSC8270)を使用し、昇温速度10℃/分にしてガラス転移温度Tgおよび融解による吸熱反応が収束する温度Tmを測定した。
アルキメデス法により比重を測定した。
各テストピースを、温度85℃相対湿度85%の恒温恒湿槽内に168時間保持した。その後、各テストピースを蛍光灯下の目視による外観評価に付した。評価結果から、以下の基準により耐候性を評価した。
◎:表面に変質は認められない。
〇:表面にクモリが認められたが、潮解なし。
×:潮解した。
テストピースの作製のために用いたガラス原料と同じ処方で、熔解後に200gのガラスが得られるだけの原料((混合物))を秤量混合した後、白金製坩堝またはシリカガラス製坩堝中に投入し、1000℃で60分間熔解した。目視で観察した結果、熔け残りなく融液が得られた場合を「〇」、熔け残りがあった場合を「×」として評価した。
例えば、上述の例示されたガラス組成に対し、明細書に記載の組成調整を行うことにより、本発明の一態様にかかる近赤外線吸収ガラスを得ることができる。
また、明細書に例示または好ましい範囲として記載した事項の2つ以上を任意に組み合わせることは、もちろん可能である。
Claims (13)
- 構成イオンとして、
Pイオン、
Cuイオン、
Oイオン、
Liイオン、NaイオンおよびKイオンからなる群から選ばれる1種以上のイオン、ならびに、
Mgイオン、Caイオン、SrイオンおよびBaイオンからなる群から選ばれる1種以上のイオン、
を少なくとも含み、
カチオン%表示のガラス組成において、
Cuイオンの含有量が15.0カチオン%以下であり、
Pイオンの含有量が55.0カチオン%以下であり、
Mgイオン、Caイオン、Srイオン、Baイオン、ZnイオンおよびCuイオンの合計含有量に対するAlイオンとPイオンとの合計含有量のカチオン比((Alイオン+Pイオン)/(Mgイオン+Caイオン+Srイオン+Baイオン+Znイオン+Cuイオン))が5.300以下であり、
Liイオン、NaイオンおよびKイオンの合計含有量に対するMgイオン、Caイオン、SrイオンおよびBaイオンの合計含有量のカチオン比((Mgイオン+Caイオン+Srイオン+Baイオン)/(Liイオン+Naイオン+Kイオン))が0.100以上であり、
CuイオンおよびPイオンを除くカチオン類の平均価数が1.500未満であり、
アニオン%表示のガラス組成において、
Oイオンの含有量が85.0アニオン%以上であり、かつ
Pイオンの含有量に対するOイオンの含有量の比率(Oイオン/Pイオン)が3.300以上である、近赤外線吸収ガラス。 - カチオン%表示のガラス組成において、Pイオンの含有量が30.0カチオン%以上50.0カチオン%以下である、請求項1に記載の近赤外線吸収ガラス。
- カチオン%表示のガラス組成において、Liイオンの含有量が10.0カチオン%以上である、請求項1または2に記載の近赤外線吸収ガラス。
- カチオン%表示のガラス組成において、Cuイオンの含有量が2.1カチオン%以上15.0カチオン%以下である、請求項1~3のいずれか1項に記載の近赤外線吸収ガラス。
- 前記比率(Oイオン/Pイオン)が3.400以上である、請求項1~4のいずれか1項に記載の近赤外線吸収ガラス。
- カチオン%表示のガラス組成において、Mgイオン、Caイオン、Srイオン、BaイオンおよびZnイオンの合計含有量に対するZnイオンのカチオン比(Znイオン/(Mgイオン+Caイオン+Srイオン+Baイオン+Znイオン))が0.600以下である、請求項1~5のいずれか1項に記載の近赤外線吸収ガラス。
- アニオン%表示のガラス組成において、Fイオンの含有量が10.0アニオン%以下である、請求項1~6のいずれか1項に記載の近赤外線吸収ガラス。
- 厚み0.11mm換算の透過率特性として、波長600nm以上で透過率が50%となる波長が600nm~650nmの範囲にあり、波長1200nmにおける透過率T1200が42.0%以下であり、かつ波長400nmにおける透過率T400が68.0%以上である、請求項1~7のいずれか1項に記載の近赤外線吸収ガラス。
- 厚み0.21mm換算の透過率特性として、波長600nm以上で透過率が50%となる波長が600nm~650nmの範囲にあり、波長1200nmにおける透過率T1200が42.0%以下であり、かつ波長400nmにおける透過率T400が68.0%以上である、請求項1~7のいずれか1項に記載の近赤外線吸収ガラス。
- 請求項1~7のいずれか1項に記載の近赤外線吸収ガラスからなる近赤外線カットフィルタ。
- 厚みが0.25mm以下である、請求項10に記載の近赤外線カットフィルタ。
- 厚み0.11mm換算の透過率特性として、波長600nm以降で透過率が50%となる波長が600nm-650nmの範囲にあり、波長1200nmにおける透過率T1200が42.0%以下であり、かつ波長400nmにおける透過率T400が68.0%以上である、請求項10または11に記載の近赤外線カットフィルタ。
- 厚み0.21mm換算の透過率特性として、波長600nm以降で透過率が50%となる波長が600nm-650nmの範囲にあり、波長1200nmにおける透過率T1200が42.0%以下であり、かつ波長400nmにおける透過率T400が68.0%以上である、請求項10または11に記載の近赤外線カットフィルタ。
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JP2013053058A (ja) * | 2011-08-11 | 2013-03-21 | Hoya Corp | フツリン酸ガラス及びその製造方法並びに近赤外光吸収フィルター |
JP2014125395A (ja) * | 2012-12-27 | 2014-07-07 | Nippon Electric Glass Co Ltd | ガラス |
JP2019038719A (ja) * | 2017-08-25 | 2019-03-14 | 日本電気硝子株式会社 | 近赤外線吸収ガラス |
-
2020
- 2020-12-25 US US17/788,459 patent/US20230057228A1/en active Pending
- 2020-12-25 CN CN202080090602.4A patent/CN114901606A/zh active Pending
- 2020-12-25 WO PCT/JP2020/048961 patent/WO2021132645A1/ja active Application Filing
- 2020-12-25 KR KR1020227022054A patent/KR20220110776A/ko not_active Application Discontinuation
- 2020-12-25 JP JP2021567712A patent/JPWO2021132645A1/ja active Pending
- 2020-12-25 TW TW109146208A patent/TW202140396A/zh unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011071157A1 (ja) * | 2009-12-11 | 2011-06-16 | 旭硝子株式会社 | 近赤外線カットフィルタガラス |
JP2011168455A (ja) * | 2010-02-19 | 2011-09-01 | Asahi Glass Co Ltd | 近赤外線カットフィルタガラス |
KR20110102658A (ko) * | 2010-03-11 | 2011-09-19 | 한국세라믹기술원 | 근적외선 필터용 유리조성물 및 이를 이용한 근적외선 필터용 유리의 제조방법 |
WO2012018026A1 (ja) * | 2010-08-03 | 2012-02-09 | 旭硝子株式会社 | 近赤外線カットフィルタガラスおよびその製造方法 |
JP2013053058A (ja) * | 2011-08-11 | 2013-03-21 | Hoya Corp | フツリン酸ガラス及びその製造方法並びに近赤外光吸収フィルター |
JP2014125395A (ja) * | 2012-12-27 | 2014-07-07 | Nippon Electric Glass Co Ltd | ガラス |
JP2019038719A (ja) * | 2017-08-25 | 2019-03-14 | 日本電気硝子株式会社 | 近赤外線吸収ガラス |
Also Published As
Publication number | Publication date |
---|---|
TW202140396A (zh) | 2021-11-01 |
KR20220110776A (ko) | 2022-08-09 |
JPWO2021132645A1 (ja) | 2021-07-01 |
US20230057228A1 (en) | 2023-02-23 |
CN114901606A (zh) | 2022-08-12 |
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