WO2010126097A1 - 光学ガラス、光学素子及び精密プレス成形用プリフォーム - Google Patents
光学ガラス、光学素子及び精密プレス成形用プリフォーム Download PDFInfo
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- WO2010126097A1 WO2010126097A1 PCT/JP2010/057609 JP2010057609W WO2010126097A1 WO 2010126097 A1 WO2010126097 A1 WO 2010126097A1 JP 2010057609 W JP2010057609 W JP 2010057609W WO 2010126097 A1 WO2010126097 A1 WO 2010126097A1
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- 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
- C03C3/122—Silica-free oxide glass compositions containing oxides of As, Sb, Bi, Mo, W, V, Te as glass formers
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- 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
- C03C3/14—Silica-free oxide glass compositions 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
- C03C3/14—Silica-free oxide glass compositions containing boron
- C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths
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- 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
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- 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
Definitions
- the present invention relates to an optical glass, an optical element, and a precision press-molding preform.
- Patent Documents 1 to 5 describe optical glasses having a refractive index (n d ) of 1.8 or more and an Abbe number ( ⁇ d ) of around 20.
- the tellurite glass as represented is known.
- a method of grinding and polishing a glass molded product obtained by softening and molding glass reheat press molding
- cutting and polishing a gob or a glass block There is used a method (precise press molding) in which a preform material or a preform material formed by known flotation molding is heat-softened and pressure-molded with a mold having a highly accurate molding surface.
- Patent Document 1 and Patent Document 2 since the glass disclosed in Patent Document 1 and Patent Document 2 has a high glass transition point (Tg), these glasses were difficult to soften even when heated. Therefore, when a preform material is produced from the glass of Patent Document 1 and Patent Document 2, and an optical element is produced by heat-softening and press-molding the preform material, it is necessary to increase the temperature at which the preform material is heat-softened. For this reason, the die used for press molding and the preform material are fused, and the optical characteristics of the optical element are affected.
- Tg glass transition point
- the glass disclosed in Patent Document 3 is a glass having a lower Abbe number ( ⁇ d ), it is more difficult to vitrify due to devitrification, and the transmittance for visible light is colored by reduction of the Te component. Was low. For this reason, it was difficult for the glass disclosed in Patent Document 3 to achieve both a low Abbe number ( ⁇ d ) of glass and the productivity of the glass itself.
- the glass disclosed in Patent Document 4 has a low Abbe number ( ⁇ d ) because it contains a large amount of TiO 2 and WO 3, but these glasses are all colored. The transmittance for visible light was low. For this reason, it was difficult for the glass disclosed in Patent Document 4 to achieve both a low Abbe number ( ⁇ d ) of glass and high transparency to visible light.
- the glasses disclosed in Patent Document 5 were produced by the present inventor, and all of them were glasses with a high degree of wear (Aa) although the glass transition point (Tg) was low. For this reason, since all the glasses disclosed in Patent Document 3 are easily scratched on the surface and difficult to polish, it is difficult to improve press formability and polishing processability.
- the present invention has been made in view of the above problems, and its object is to have a low Abbe number ( ⁇ d ) while the refractive index (n d ) is within a desired range and is low.
- An object is to obtain an optical glass that is easily softened at a temperature and is easily polished, an optical element using the optical glass, and a preform for precision press molding.
- Another object of the present invention is to obtain an optical glass having high transparency to visible light and high resistance to devitrification during glass formation, an optical element using the optical glass, and a precision press-molding preform.
- the present inventors have conducted intensive test studies, and as a result, they have a TeO 2 component, a Bi 2 O 3 component, a Nb 2 O 5 component, a WO 3 component, and a TiO 2 component.
- One or more selected components are used in combination, and by suppressing the content of these components within a predetermined range, the glass has a high refractive index, but the dispersion is increased and a low Abbe number is obtained.
- the inventors have found that the glass transition point (Tg) is low and the wear degree of the glass is low, and the present invention has been completed.
- TeO 2 component and Bi 2 O 3 component by suppressing the content of TeO 2 component and Bi 2 O 3 component in the predetermined range, also the transmittance of the glass to visible light is enhanced It was. Also, a combination of TeO 2 component and WO 3 components, by suppressing the content of TeO 2 component and WO 3 components within a predetermined range, the transmittance of the glass to visible light is enhanced, and resistance at the time of glass formation It has also been found that devitrification is improved. Specifically, the present invention provides the following.
- TeO 2 component 40.0% or more and less than 75.0% of TeO 2 component, Bi 2 O 3 component, Nb 2 O 5 component, WO 3 component, An optical glass containing 1.0% or more and 40.0% or less of one or more components selected from the group consisting of TiO 2 components and having an Abbe number ( ⁇ d ) of 30 or less.
- optical glass according to (1) which contains 1.0% or more and 25.0% or less of Nb 2 O 5 component in mol% with respect to the total amount of glass having an oxide equivalent composition.
- the optical glass according to (1) containing 1.0% or more and 30.0% or less of a TiO 2 component in mol% with respect to the total amount of the glass having an oxide conversion composition.
- optical glass according to (1) which contains 1.0% or more and 40.0% or less of the WO 3 component in mol% with respect to the total amount of glass having an oxide equivalent composition.
- a combination of TeO 2 component and one or more components selected from the group consisting of Bi 2 O 3 component, Nb 2 O 5 component, WO 3 component and TiO 2 component are used together.
- the glass has a high refractive index, but the dispersion is increased to obtain a low Abbe number, the transmittance of the glass to visible light is increased, and the glass Abrasion degree decreases. For this reason, it has a low Abbe number ( ⁇ d ) while its refractive index (n d ) is within a desired range, is highly transparent to visible light, is easily softened at a low temperature, and is easy to polish. Glass, an optical element using the glass, and a precision press-molding preform can be obtained.
- the TeO 2 component is 40.0% or more and less than 75.0% in mol% with respect to the total amount of glass in the oxide conversion composition, Bi 2 O 3 component, Nb 2 O 5 component, It contains 1.0% or more and 40.0% or less of one or more components selected from the group consisting of WO 3 component and TiO 2 component, and has an Abbe number ( ⁇ d ) of 30 or less.
- TeO 2 component and one or more components selected from the group consisting of Bi 2 O 3 component, Nb 2 O 5 component, WO 3 component and TiO 2 component are used in combination, and the content of these components is within a predetermined range.
- the refractive index of the glass While keeping the refractive index within the range, the refractive index of the glass is increased, but the dispersion is increased to obtain a low Abbe number, the transmittance of the glass to visible light is increased, and the glass transition point (Tg) is lowered.
- the glass is provided with an appropriate degree of wear. Accordingly, an optical glass having a low Abbe number ( ⁇ d ) while having a refractive index (n d ) within a desired range, high transparency to visible light, easy softening at a low temperature, and easy polishing. And an optical element using this and a precision press-molding preform can be obtained.
- the first optical glass has a TeO 2 component of 40.0% or more and less than 75.0% and a Bi 2 O 3 component of 1.0% in terms of mol% with respect to the total amount of the glass having an oxide conversion composition.
- the content is 40.0% or less and has an Abbe number ( ⁇ d ) of 30 or less.
- a combination of TeO 2 component and Bi 2 O 3 component by suppressing the content of TeO 2 component and Bi 2 O 3 component in the predetermined range, the transmittance of the glass to visible light is enhanced. Therefore, an optical glass that can be preferably used for applications that transmit visible light, an optical element using the glass, and a precision press-molding preform can be obtained.
- the second optical glass has a TeO 2 component of 40.0% or more and less than 75.0% and an Nb 2 O 5 component of 1.0% in mol% with respect to the total amount of the glass in an oxide conversion composition.
- the content is 25.0% or less and has an Abbe number ( ⁇ d ) of 30 or less.
- the third optical glass has a TeO 2 component of 40.0% or more and less than 75.0% and a TiO 2 component of 1.0% or more and 30% by mol% with respect to the total amount of glass in the oxide equivalent composition. 0.0% or less and an Abbe number ( ⁇ d ) of 30 or less.
- the fourth optical glass has a TeO 2 component of 40.0% or more and less than 75.0% and a WO 3 component of 1.0% or more and 40% by mol% with respect to the total amount of the glass having an oxide conversion composition. 0.0% or less and an Abbe number ( ⁇ d ) of 30 or less.
- the TeO 2 component and the WO 3 component are used in combination, and the transmittance of the TeO 2 component and the WO 3 component is suppressed within a predetermined range, whereby the transmittance for visible light of the glass is increased, and at the time of glass formation Devitrification resistance is improved. Therefore, an optical glass that can be preferably used for applications that transmit visible light, an optical element using the glass, and a precision press-molding preform can be obtained.
- each component constituting the optical glass of the present invention The composition range of each component constituting the optical glass of the present invention is described below. In the present specification, unless otherwise specified, the content of each component is all expressed in mol% with respect to the total amount of glass having an oxide equivalent composition.
- the “equivalent oxide composition” means that the oxide, composite salt, metal fluoride, etc. used as a raw material of the glass component of the present invention are all decomposed and changed into an oxide when melted. It is the composition which described each component contained in glass by making the total amount of substances of a production
- the TeO 2 component is a glass forming component, and is a component that increases the refractive index of the glass while increasing the dispersion of the glass.
- the TeO 2 component content is set to 40.0% or more, the dispersion and refractive index of the glass can be increased, so that a desired Abbe number ( ⁇ d ) and refractive index can be obtained.
- the content of TeO 2 component is set to less than 75.0%, it is possible to improve the devitrification resistance when forming glass by lowering the liquidus temperature of the glass.
- the content ratio of the TeO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 40.0%, more preferably 43.0%, and most preferably 45.0%.
- the TeO 2 content is preferably less than 75.0%, more preferably 70.0%, more preferably less than 70.0%, and most preferably 65.0%.
- the TeO 2 component can be contained in the glass using, for example, TeO 2 as a raw material.
- the sum of the content ratios of one or more components selected from the group consisting of Bi 2 O 3 component, Nb 2 O 5 component, WO 3 component and TiO 2 component is 1.0% or more and 40 0.0% or less.
- the sum of the content ratios 1.0% or more it is easy to vitrify the TeO 2 component while increasing the refractive index and dispersion of the glass, so that the desired high refractive index and high dispersion can be obtained. While obtained, the coloration of the glass can be reduced.
- the sum of the contents to 40.0% or less, the liquidus temperature and the glass transition point (Tg) of the glass are lowered. Molding can be facilitated.
- the sum of the content ratios of one or more components selected from the group consisting of Bi 2 O 3 component, Nb 2 O 5 component, WO 3 component and TiO 2 component with respect to the total amount of glass in oxide equivalent composition is
- the lower limit is preferably 1.0%, more preferably 3.0%, and most preferably 5.0%, preferably 40.0%, more preferably 35.0%, most preferably 30.0%.
- Bi 2 O 3 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the liquidus temperature of the glass and the glass transition point (Tg) are lowered, while increasing the devitrification resistance during glass formation, It is possible to facilitate press molding.
- the first optical glass by making the content of the Bi 2 O 3 component 1.0% or more, it is easy to vitrify the TeO 2 component while increasing the dispersion of the glass. Low Abbe number ( ⁇ d ) and coloring of the glass can be reduced.
- the upper limit of the content ratio of the Bi 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 40.0%, more preferably 30.0%, and most preferably 20.0%.
- the content of the Bi 2 O 3 component with respect to the total amount of the glass having an oxide conversion composition is preferably 40.0%, more preferably 35.0%, and most preferably 30.
- the upper limit is 0%.
- the content ratio of the Bi 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 25.0%, more preferably 23.0%, most preferably The upper limit is 20.0%.
- the content ratio of the Bi 2 O 3 component with respect to the total amount of the glass having an oxide conversion composition is preferably 25.0%, more preferably 20.0%, and most preferably 15.0. % Is the upper limit.
- the content of the Bi 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 3.0%, and most preferably 5.0. % Is the lower limit.
- the Bi 2 O 3 component can be contained in the glass using, for example, Bi 2 O 3 as a raw material.
- Nb 2 O 5 component is a component that raises the refractive index and dispersion of the glass, an optional component of the optical glass of the present invention.
- an increase in the glass transition point (Tg) can be suppressed while suppressing a decrease in the devitrification resistance of the glass.
- the second optical glass by setting the content of the Nb 2 O 5 component to 1.0% or more, the degree of abrasion of the glass is lowered while the dispersion of the glass is increased. ( ⁇ d ) and workability during glass polishing can both be achieved.
- the content of the Nb 2 O 5 component is preferably 25.0%, more preferably 22.0%, still more preferably 20.0%, and most preferably 15.5% with respect to the total amount of glass having an oxide equivalent composition.
- the upper limit is 0%.
- the content of Nb 2 O 5 component to the glass the total amount of substance of the oxide composition in terms of, preferably 1.0%, more preferably 2.0%, most preferably 3.0 % Is the lower limit.
- the Nb 2 O 5 component can be contained in the glass using, for example, Nb 2 O 5 as a raw material.
- TiO 2 component while increasing the refractive index and dispersion of the glass is a component to lower the liquidus temperature of the glass, an optional component of the optical glass of the present invention.
- an increase in the glass transition point (Tg) can be suppressed while suppressing a decrease in the devitrification resistance of the glass.
- the third optical glass by setting the content of the TiO 2 component to 1.0% or more, the degree of abrasion of the glass is lowered while the dispersion of the glass is increased. Therefore, a desired low Abbe number ( ⁇ d ) and workability during glass polishing can both be achieved.
- the content of the TiO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably 10.0%.
- the content of the TiO 2 component is preferably 30.0%, more preferably 15.0%, and most preferably 10.0% with respect to the total amount of glass in the oxide equivalent composition.
- the content of the TiO 2 component is preferably 30.0%, more preferably 25.0%, and most preferably 20.
- the upper limit is 0%.
- the content of the TiO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 1.5%, and most preferably 2.0%.
- the lower limit. TiO 2 component may be contained in the glass by using as the starting material for example TiO 2 or the like.
- WO 3 component is a component that raises the refractive index and dispersion of the glass, an optional component of the optical glass of the present invention.
- the content of the WO 3 component is set to 40.0% or less, the glass transition point (Tg) and the liquidus temperature are prevented from rising, so that while maintaining good devitrification resistance, it is good. Press characteristics can be obtained.
- the fourth optical glass by setting the content of the WO 3 component to 1.0% or more, the glass liquid phase temperature is lowered while the dispersion of the glass is increased.
- the number ( ⁇ d ) can be compatible with the devitrification resistance during glass formation.
- the content of the WO 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 40.0%, more preferably 30.0%, and most preferably 20.0%.
- the content of the WO 3 component is preferably 25.0%, more preferably 20.0%, and most preferably 15 with respect to the total amount of glass having an oxide conversion composition. 0.0% is the upper limit.
- the content of the WO 3 component is preferably 40.0%, more preferably 30.0%, and most preferably 20.0% with respect to the total amount of glass in the oxide equivalent composition. The upper limit.
- the content of the WO 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 1.5%, and most preferably 1.7%.
- the WO 3 component can be contained in the glass using, for example, WO 3 as a raw material.
- Li 2 O component is a component that lowers the melting temperature and the glass transition point of the glass (Tg), which is an optional component of the optical glass of the present invention.
- Tg glass transition point of the glass
- the upper limit of the content ratio of the Li 2 O component with respect to the total amount of glass in the oxide conversion composition is preferably 25.0%, more preferably 22.0%, and most preferably 20.0%.
- the Li 2 O component can be contained in the glass using, for example, Li 2 CO 3 , LiNO 3 , LiF or the like as a raw material.
- the Na 2 O component is a component that lowers the melting temperature and glass transition point (Tg) of the glass, and is an optional component in the optical glass of the present invention.
- Tg melting temperature and glass transition point
- the content of the Na 2 O component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 25.0%, and most preferably 20.0%.
- the Na 2 O component can be contained in the glass using, for example, Na 2 CO 3 , NaNO 3 , NaF, Na 2 SiF 6 or the like as a raw material.
- K 2 O component is a component that lowers the melting temperature and the glass transition point of the glass (Tg), which is an optional component of the optical glass of the present invention.
- Tg glass transition point of the glass
- the upper limit of the content of the K 2 O component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably 10.0%.
- the K 2 O component can be contained in the glass using, for example, K 2 CO 3 , KNO 3 , KF, KHF 2 , K 2 SiF 6 or the like as a raw material.
- the Cs 2 O component is a component that lowers the melting temperature of the glass, an optional component of the optical glass of the present invention.
- the upper limit of the content of the Cs 2 O component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably 10.0%.
- the Cs 2 O component can be contained in the glass using, for example, Cs 2 CO 3 , CsNO 3 or the like as a raw material.
- the content amount of the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is 30.0% or less. Preferably there is.
- the total amount of the Rn 2 O component content relative to the total glass material amount in oxide equivalent composition is preferably 30.0%, more preferably 28.0%, even more preferably 25.0%, most preferably Has an upper limit of 20.0%.
- the sum of the content of the Rn 2 O component with respect to the total amount of glass in the oxide conversion composition is preferably less than 20.0% in that the abrasion degree of the optical glass can be reduced to facilitate polishing. More preferably, it is less than 15.0%, more preferably 12.0%, and most preferably 10.0%.
- Ga 2 O 3 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the content of the Ga 2 O 3 component with respect to the total glass substance amount of the oxide conversion composition is preferably 20.0%, more preferably 10.0% as an upper limit, further preferably less than 5.0%, Most preferably, it is less than 4.0%.
- the Ga 2 O 3 component can be contained in the glass using, for example, Ga 2 O 3 , GaF 3 or the like as a raw material.
- the ZnO component is a component that increases the devitrification resistance during glass formation, reduces the coloration of the glass, and improves the solubility of the glass, and is an optional component in the optical glass of the present invention.
- the content of the ZnO component is preferably 30.0%, more preferably 29.0%, still more preferably 28.0%, and most preferably 25.0%. The upper limit.
- the content of the ZnO component with respect to the total amount of glass in the oxide conversion composition is preferably less than 15.0%, more preferably 12.0%, most preferably Has an upper limit of 10.0%.
- the content of the ZnO component with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 2.0%, and most preferably 5.0%.
- the ZnO component can be contained in the glass using, for example, ZnO, ZnF 2 or the like as a raw material.
- La 2 O 3 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the content of the La 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 25.0%, more preferably 20.0%, and most preferably 15.0%.
- the content of the La 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably less than 10.0%, more preferably less than 8.0%. And most preferably less than 7.0%.
- the content of the La 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 9.5%, The upper limit is more preferably 8.0%, and most preferably 6.0%.
- the La 2 O 3 component can be contained in the glass using, for example, La 2 O 3 , La (NO 3 ) 3 .XH 2 O (X is an arbitrary integer) or the like as a raw material.
- the B 2 O 3 component is a component that constitutes the network of the glass, and is a component that increases the devitrification resistance of the glass to homogenize the glass, and is an optional component in the optical glass of the present invention.
- the content ratio of the B 2 O 3 component is preferably 40.0%, more preferably 35.0%, and most preferably 30.0%.
- the content ratio of the B 2 O 3 component in the first optical glass with respect to the total amount of the glass having the oxide conversion composition is preferably 20.
- the upper limit is less than 0%, more preferably less than 17.0%, and most preferably 15.0%.
- the content ratio of the B 2 O 3 component with respect to the total amount of the glass having an oxide conversion composition is preferably less than 20.0%, more preferably 17.0%, and most preferably 15%. 0.0% is the upper limit.
- the content ratio of the B 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably less than 25.0%, more preferably less than 23.0%, most preferably The upper limit is 20.0%.
- the content ratio of the B 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably less than 25.0%, more preferably less than 20.0%, and most preferably The upper limit is 17.0%.
- the B 2 O 3 component can be contained in the glass using, for example, H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 .10H 2 O, BPO 4 or the like as a raw material.
- the MgO component is a component that increases the transmittance in the visible region of the glass and improves the solubility and stability of the glass, and is an optional component in the optical glass of the present invention.
- the upper limit of the content of the MgO component with respect to the total amount of glass in the oxide conversion composition is preferably 15.0%, more preferably 10.0%, and most preferably 5.0%.
- the MgO component can be contained in the glass using, for example, MgCO 3 or MgF 2 as a raw material.
- a CaO component is a component which improves the transmittance
- the content of the CaO component is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the CaO component can be contained in the glass using, for example, CaCO 3 , CaF 2 or the like as a raw material.
- the SrO component is a component that increases the transmittance in the visible region of the glass and improves the solubility and stability of the glass, and is an optional component in the optical glass of the present invention.
- the upper limit of the content of the SrO component with respect to the total amount of glass in the oxide conversion composition is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the SrO component can be contained in the glass using, for example, Sr (NO 3 ) 2 , SrF 2 or the like as a raw material.
- the BaO component is a component that improves the solubility and stability of the glass, and is an optional component in the optical glass of the present invention.
- the upper limit of the content of the BaO component with respect to the total amount of glass in the oxide conversion composition is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the BaO component can be contained in the glass using, for example, BaCO 3 , Ba (NO 3 ) 2 or the like as a raw material.
- the content amount of the RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr and Ba) is 20.0% or less. Is preferred.
- the sum of the content ratio of the RO component with respect to the total amount of glass in the oxide conversion composition is preferably 20.0%, more preferably 15.0%, still more preferably 10.0%, and most preferably 8.0. % Is the upper limit.
- the SiO 2 component is a component that reduces devitrification of the glass by promoting stable glass formation, and is an optional component in the optical glass of the present invention.
- the content of the SiO 2 component is preferably 30.0%, more preferably 20.0%, and most preferably 15.0%.
- SiO 2 component may be contained in the glass by using as a raw material such as SiO 2, K 2 SiF 6, Na 2 SiF 6 or the like.
- the GeO 2 component is a component that reduces devitrification of the glass by promoting stable glass formation, and is an optional component in the optical glass of the present invention.
- an increase in the glass transition point (Tg) can be suppressed by setting the content of the GeO 2 component to 30.0% or less.
- the content of the GeO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably 10.0%.
- the content of the GeO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably The upper limit is 15.0%.
- the content of the GeO 2 component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, still more preferably 10.0%, Most preferably, the upper limit is 4.5%.
- the GeO 2 component can be contained in the glass using, for example, GeO 2 as a raw material.
- the P 2 O 5 component is a component that reduces devitrification of the glass by promoting stable glass formation, and is an optional component in the optical glass of the present invention.
- the content of the P 2 O 5 component is preferably 30.0%, more preferably 25.0%, and most preferably 20.0%.
- the P 2 O 5 component can be contained in the glass using, for example, Al (PO 3 ) 3 , Ca (PO 3 ) 2 , Ba (PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like as a raw material. .
- the Al 2 O 3 component is a component that increases the devitrification resistance of the glass, and is an optional component in the optical glass of the present invention.
- the upper limit of the content of the Al 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 30.0%, more preferably 20.0%, and most preferably 15.0%.
- the Al 2 O 3 component can be contained in the glass using, for example, Al 2 O 3 , Al (OH) 3 , AlF 3 or the like as a raw material.
- the In 2 O 3 component is a component that increases the refractive index of the glass and is an optional component in the optical glass of the present invention.
- the content ratio of the In 2 O 3 component with respect to the total amount of glass in the oxide-converted composition is preferably 15.0%, more preferably 10.0%, and even more preferably less than 5.0%. Most preferably, it is less than 4.0%.
- the In 2 O 3 component can be contained in the glass using, for example, In 2 O 3 , InF 3 or the like as a raw material.
- the ZrO 2 component is a component that suppresses devitrification in the process of cooling the glass from the molten state while increasing the refractive index of the glass, and is an optional component in the optical glass of the present invention.
- the content of the ZrO 2 component is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the ZrO 2 component can be contained in the glass using, for example, ZrO 2 , ZrF 4 or the like as a raw material.
- Ta 2 O 5 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the content of the Ta 2 O 5 component is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the Ta 2 O 5 component can be contained in the glass using, for example, Ta 2 O 5 as a raw material.
- Gd 2 O 3 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the content of the Gd 2 O 3 component is preferably 25.0%, more preferably 20.0%, and most preferably 15.0%.
- the Gd 2 O 3 component can be contained in the glass using, for example, Gd 2 O 3 , GdF 3 or the like as a raw material.
- the Y 2 O 3 component while increasing the refractive index of the glass, or to enhance the chemical durability of the glass, an optional component of the optical glass of the present invention.
- the content of the Y 2 O 3 component is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the Y 2 O 3 component can be contained in the glass using, for example, Y 2 O 3 , YF 3 or the like as a raw material.
- Yb 2 O 3 component is a component that raises the refractive index of the glass, an optional component of the optical glass of the present invention.
- the upper limit of the content of the Yb 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 20.0%, more preferably 15.0%, and most preferably 10.0%.
- the Yb 2 O 3 component can be contained in the glass using, for example, Yb 2 O 3 as a raw material.
- the Sb 2 O 3 component is a component that promotes defoaming of the glass, and is an optional component in the optical glass of the present invention.
- the upper limit of the content of the Sb 2 O 3 component with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 0.9%, and most preferably 0.8%.
- the Sb 2 O 3 component can be contained in the glass using, for example, Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 ⁇ 5H 2 O, or the like as a raw material.
- the CeO 2 component is a component effective for clarifying the glass, and is an optional component in the optical glass of the present invention.
- the CeO 2 component content with respect to the total amount of glass in the oxide conversion composition is preferably 1.0%, more preferably 0.9%, and most preferably 0.8%.
- the CeO 2 component can be contained in the glass using, for example, CeO 2 as a raw material.
- the component which clarifies and defoams glass is not limited to the above Sb 2 O 3 component or CeO 2 component, but a known clarifier or defoamer in the field of glass production, or a combination thereof. Can be used.
- transition metal components can be added as necessary within the range not impairing the characteristics of the glass of the present invention. However, excluding Ti, Nb, W, Zr, Ta, La, Gd, Y, V, Cr, Mn, Fe, Co, Ni, Cu, Ag, Mo, Eu, Nd, Sm, Tb, Dy, Er, etc. These transition metal components are used especially for wavelengths in the visible region because they have the property that the glass is colored and absorbs at a specific wavelength in the visible region even when contained in a small amount by combining them individually or in combination. In optical glass, it is preferable that it does not contain substantially. Here, “substantially does not contain” means that it does not contain unless it is mixed as an impurity.
- lead compounds such as PbO, arsenic compounds such as As 2 O 3 , and components of Th, Cd, Tl, Os, Be, and Se are components that tend to refrain from being used as harmful chemical substances in recent years. .
- lead compounds such as PbO, arsenic compounds such as As 2 O 3 , and components of Th, Cd, Tl, Os, Be, and Se are components that tend to refrain from being used as harmful chemical substances in recent years. .
- lead compounds such as PbO, arsenic compounds such as As 2 O 3 , and components of Th, Cd, Tl, Os, Be, and Se are components that tend to refrain from being used as harmful chemical substances in recent years. .
- the optical glass is substantially free of substances that pollute the environment. Therefore, the optical glass can be manufactured, processed, and discarded without taking any special environmental measures.
- the glass composition of the present invention is not expressed directly in terms of mass% because the composition is expressed in terms of mol% with respect to the total amount of glass in the oxide-converted composition, but is required in the present invention.
- the composition represented by mass% of each component present in the glass composition satisfying the characteristics generally takes the following values in terms of oxide conversion.
- the composition expressed by mass% of each component contained in the first optical glass generally takes the following values in terms of oxide.
- Li 2 O component 0 to 7.0 mass% and / or Na 2 O component 0 to 12.0 mass% and / or K 2 O component 0 to 18.0 mass% and / or Cs 2 O component 0 to 40 0.0 mass% and / or La 2 O 3 component 0-40.0 mass% and / or MgO component 0-8.0 mass% and / or CaO component 0-8.0 mass% and / or SrO component 0- 15.0% by mass and / or BaO component 0-20.0% by mass and / or SiO 2 component 0-13.0% by mass and / or B 2 O 3 component 0-30.0% by mass and / or GeO 2 Component 0-20.0 mass% and / or P 2 O 5 component 0-30.0 mass% and / or Al 2 O 3 component 0-2
- the composition by the mass% display of each component contained in 2nd optical glass takes the following values in an oxide conversion composition in general.
- Li 2 O component 0 to 7.0 mass% and / or Na 2 O component 0 to 12.0 mass% and / or K 2 O component 0 to 18.0 mass% and / or Cs 2 O component 0 to 40 0.0% by mass and / or ZnO component 0-25.0% by mass and / or La 2 O 3 component 0-40.0% by mass and / or WO 3 component 0-35.0% by mass and / or B 2 O 3 components 0 to 30.0 mass% and / or MgO component 0 to 8.0 mass% and / or CaO component 0 to 8.0 mass% and / or SrO component 0 to 15.0 mass% and / or BaO component 0-20.0% by mass and / or SiO 2 component 0-13.0% by mass and /
- the composition by the mass% display of each component contained in 3rd optical glass takes the following values in an oxide conversion composition in general.
- Li 2 O component 0 to 7.0 mass% and / or Na 2 O component 0 to 12.0 mass% and / or K 2 O component 0 to 18.0 mass% and / or Cs 2 O component 0 to 40 0.0% by mass and / or ZnO component 0-25.0% by mass and / or La 2 O 3 component 0-40.0% by mass and / or WO 3 component 0-35.0% by mass and / or B 2 O 3 components 0 to 30.0 mass% and / or MgO component 0 to 8.0 mass% and / or CaO component 0 to 8.0 mass% and / or SrO component 0 to 15.0 mass% and / or BaO component 0-20.0% by mass and / or SiO 2 component 0-13.0% by mass and / or
- the composition by the mass% display of each component contained in 4th optical glass takes the following values in an oxide conversion composition in general. TeO 2 component 40.0-75.0 mass% and WO 3 component 1.0-55.0 mass%, And Li 2 O component 0 to 7.0 mass% and / or Na 2 O component 0 to 12.0 mass% and / or K 2 O component 0 to 18.0 mass% and / or Cs 2 O component 0 to 40 0.0% by mass and / or ZnO component 0-25.0% by mass and / or La 2 O 3 component 0-40.0% by mass and / or B 2 O 3 component 0-30.0% by mass and / or MgO Component 0 to 8.0% by mass and / or CaO component 0 to 8.0% by mass and / or SrO component 0 to 15.0% by mass and / or BaO component 0 to 20.0% by mass and / or SiO 2 component 0-13.0% by mass and / or GeO 2 component 0-20.0% by mass and / or P 2
- the optical glass of the present invention is produced, for example, as follows. That is, the above raw materials are uniformly mixed so that each component is within a predetermined content range, and the prepared mixture is put into a quartz crucible or an alumina crucible and roughly melted, and then a gold crucible, a platinum crucible, a platinum alloy It is made by melting in a temperature range of 500-1200 ° C in a crucible or iridium crucible, homogenizing with stirring and blowing out bubbles, then lowering to an appropriate temperature, casting into a mold, and slow cooling. .
- the optical glass of the present invention needs to have a predetermined high refractive index (n d ) and high dispersion.
- the refractive index of the optical glass of the present invention (n d) is preferably 1.70, more preferably 1.75, and most preferably with a lower limit on 1.80, preferably 2.20, more preferably 2. 18, most preferably 2.15.
- the Abbe number ( ⁇ d ) of the optical glass of the present invention is preferably 30, more preferably 25, still more preferably 24, and most preferably 23.
- the lower limit of the Abbe number ( ⁇ d ) of the optical glass of the present invention is not particularly limited, but the Abbe number ( ⁇ d ) of the glass obtained by the present invention is generally 10 or more, specifically 12 or more, more specifically. In many cases, it is 14 or more.
- the partial dispersion ratio ( ⁇ g, F) is preferably close to the normal line. More specifically, the partial dispersion ratio ( ⁇ g, F) of the optical glass of the present invention is ( ⁇ 0.00160 ⁇ ⁇ d +0...) In the range of ⁇ d ⁇ 25 with respect to the Abbe number ( ⁇ d ). 63460) ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.00563 ⁇ ⁇ d +0.75873) and in the range of ⁇ d > 25 ( ⁇ 0.00250 ⁇ ⁇ d +0.65710) ⁇ ( ⁇ g , F) ⁇ ( ⁇ 0.00340 ⁇ ⁇ d +0.70300).
- the position of the plot of the partial dispersion ratio ( ⁇ g, F) and the Abbe number ( ⁇ d ) is brought closer to the normal line shown in FIGS. 1 to 5 while having high dispersion. Therefore, it can be inferred that chromatic aberration due to an optical element using this optical glass is reduced.
- the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d ⁇ 25 is preferably ( ⁇ 0.00160 ⁇ ⁇ d +0.63460), more preferably ( ⁇ 0.00160 ⁇ ⁇ d +0.63660).
- the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d > 25 is preferably ( ⁇ 0.00250 ⁇ ⁇ d +0.65710), more preferably ( ⁇ 0.00250 ⁇ ⁇ d +0.65910).
- ( ⁇ 0.00250 ⁇ ⁇ d +0.66110) is the lower limit, preferably ( ⁇ 0.00340 ⁇ ⁇ d +0.70300), more preferably ( ⁇ 0.00340 ⁇ ⁇ d +0.70100). More preferably, the upper limit is ( ⁇ 0.00340 ⁇ ⁇ d +0.69900), and most preferably ( ⁇ 0.00340 ⁇ ⁇ d +0.69700).
- the normal line (Normal Line, see FIG. 1) in the present application is based on the orthogonal coordinate system in which the partial dispersion ratio ( ⁇ g, F) is used on the vertical axis and the Abbe number ( ⁇ d ) is used on the horizontal axis. Is a straight line representing a linear relationship found between the partial dispersion ratio ( ⁇ g, F) and the Abbe number ( ⁇ d ) for general glass including low-dispersion glass.
- the Abbe number ( ⁇ d ) of PBM2 is 36.3
- the partial dispersion ratio ( ⁇ g, F) is 0.5828
- the Abbe number ( ⁇ d ) of NSL7 is 60.5
- the partial dispersion ratio ( ⁇ g, F) is 0.5436. Is).
- the partial dispersion ratio ( ⁇ g, F) of the general glass is higher than that of the normal line, and the general glass portion.
- the relationship between the dispersion ratio ( ⁇ g, F) and the Abbe number ( ⁇ d ) is represented by a curve (upward curve in FIG. 2).
- the optical glass of the present invention needs to be less colored.
- the wavelength ( ⁇ 70 ) showing a spectral transmittance of 70% in a sample having a thickness of 10 mm is 500 nm or less, more preferably 485 nm or less, and most preferably. Is 470 nm or less.
- a wavelength ( ⁇ 5 ) showing a spectral transmittance of 5% in a sample having a thickness of 10 mm is 450 nm or less, more preferably 435 nm or less, and most preferably 420 nm or less.
- the optical glass of the present invention preferably has a glass transition point (Tg) of 200 ° C. or higher and 550 ° C. or lower.
- Tg glass transition point
- the glass transition point (Tg) is 200 ° C. or higher, particularly when polishing is performed on glass, adverse effects due to frictional heat generated by the polishing can be reduced.
- the glass transition point (Tg) is 550 ° C. or lower, softening occurs at a lower temperature. Therefore, by enabling press molding at a low temperature, it is possible to reduce the oxidation of the mold used for press molding and extend the life of the mold.
- the glass transition point (Tg) of the optical glass of the present invention is preferably 200 ° C., more preferably 220 ° C., and most preferably 250 ° C., preferably 550 ° C., more preferably 530 ° C., most preferably
- the upper limit is 500 ° C.
- the optical glass of the present invention preferably has a predetermined degree of wear.
- the abrasion degree (Aa) in the measuring method according to “JOGIS10-1994 Measuring method of abrasion degree of optical glass” of optical glass preferably has an abrasion degree of 100 or more and 1000 or less.
- the degree of wear is easily polished when polishing is performed. Therefore, it is possible to facilitate the polishing process by increasing the processing efficiency of the polishing process.
- the degree of wear to 1000 or less, unnecessary wear and scratches of the optical glass are reduced, so that it is possible to facilitate the polishing process while facilitating the handling of the optical glass in the polishing process. Therefore, the abrasion degree of the optical glass of the present invention is preferably 100, more preferably 120, most preferably 150, and the upper limit is preferably 1000, more preferably 950, and most preferably 900.
- the optical glass of the present invention is useful for various optical elements and optical designs. Among them, in particular, it is used for applications of optical elements that transmit visible light into glass, such as lenses, prisms, and mirrors. Is preferred. As a result, chromatic aberration due to the optical element using this optical glass is reduced. Therefore, when used in an optical device such as a camera or a projector, the optical element and the optical system are miniaturized, and high definition and high accuracy are achieved. Imaging characteristics can be realized.
- an optical element made of the optical glass of the present invention it is possible to omit cutting and polishing, so that glass in a molten state is dropped from an outlet of an outflow pipe of platinum or the like to form a spherical shape. It is preferable to prepare a precision press-molding preform such as, and perform precision press-molding on the precision press-molding preform.
- Examples of the present invention (No. A1 to No. A25, No. B1 to No. B22, No. C1 to No. C10, No. D1 to No. D7), Reference examples (No. A1, No. B1) and Comparative examples (No.A1 ⁇ No.A2, No.B1 ⁇ No.B2 , No.C1 ⁇ No.C2, No.D1 ⁇ No.D3) composition, and the refractive index of these glasses (n d ), Abbe number ( ⁇ d ), partial dispersion ratio ( ⁇ g, F), glass transition point (Tg), abrasion degree (Aa), and wavelengths at which the spectral transmittances are 70% and 5% ( ⁇ 70 , ⁇ 5 ).
- Tables 1 to 10 show the results and the results of the presence or absence of devitrification in the formed glass.
- the Abbe number ( ⁇ d ) and partial dispersion ratio ( ⁇ g) in the glasses of Examples (No. A1 to No. A25), Reference Examples (No. A1), and Comparative Examples (No. A1 to No. A2). , F) is shown in FIG.
- the Abbe number ( ⁇ d ) and the partial dispersion ratio ( ⁇ g) in the glasses of Examples (No. B1 to No. B22), Reference Examples (No. B1), and Comparative Examples (No. B1 to No. B2). , F) is shown in FIG. FIG.
- FIG. 4 shows the relationship between the Abbe number ( ⁇ d ) and the partial dispersion ratio ( ⁇ g, F) in the glasses of Examples (No. C1 to No. C10) and Comparative Examples (No. C1 to No. C2).
- FIG. 5 shows the relationship between the Abbe number ( ⁇ d ) and the partial dispersion ratio ( ⁇ g, F) in the glasses of Examples (No. D1 to No. D7) and Comparative Examples (No. D1 to No. D3). Show.
- the following examples are merely for illustrative purposes, and are not limited to these examples.
- optical glass of the example of the present invention, and the glass of the reference example and the comparative example are all equivalent oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, metaphosphoric acids as raw materials of the respective components.
- a high-purity raw material used for ordinary optical glass such as a compound is selected, weighed so as to have a composition ratio of each example shown in Table 1 to Table 10, and mixed uniformly, and then a quartz crucible or platinum The glass was put into a crucible, melted in a temperature range of 500 to 1200 ° C. in an electric furnace according to the difficulty of melting the glass composition, homogenized with stirring, cast into a mold, and slowly cooled to produce a glass.
- the glass transition point (Tg) of the optical glass of the example of the present invention and the glass of the reference example and the comparative example was measured using a differential heat measuring apparatus (STA 409 CD manufactured by Netchgeletebau). At this time, the sample particle size was 425 to 600 ⁇ m, and the temperature elevation rate was 10 ° C./min.
- the abrasion degree of the optical glass of the example of the present invention, and the glass of the reference example and the comparative example was measured according to “Measurement method of abrasion degree of JOGIS 10-1994 optical glass”. That is, a sample of a glass square plate having a size of 30 ⁇ 30 ⁇ 10 mm is placed on a fixed position of 80 mm from the center of a flat plate made of cast iron (250 mm ⁇ ) horizontally rotating 60 times per minute, and a load of 9.8 N (1 kgf) is applied While applying vertically, a polishing solution obtained by adding 10 g of lapping material (alumina A abrasive grains) of # 800 (average particle size 20 ⁇ m) to 20 mL of water is uniformly fed for 5 minutes to cause friction, and the sample mass before and after the lapping is measured.
- lapping material alumina A abrasive grains
- the transmittance of the optical glass of the example of the present invention, and the glass of the reference example and the comparative example was measured according to Japan Optical Glass Industry Association Standard JOGIS02.
- the presence / absence and degree of coloration of the glass were determined by measuring the transmittance of the glass.
- a spectral parallel transmittance with respect to light having a wavelength of 200 to 800 nm is measured according to JISZ8722 for a facing parallel polished product having a thickness of 10 ⁇ 0.1 mm, and ⁇ 70 (wavelength at 70% transmittance) and ⁇ 70 5 (wavelength at 5% transmittance) was determined.
- the optical glasses of the examples of the present invention had an Abbe number ( ⁇ d ) of 30 or less, more specifically 25 or less.
- the optical glass of Examples (No. B1 to No. B22, No. D1 to No. D7) corresponding to the second and fourth optical glasses had an Abbe number ( ⁇ d ) of 24 or less.
- the optical glass of Examples (No. C1 to No. C10) corresponding to the third optical glass had an Abbe number ( ⁇ d ) of 23 or less. For this reason, it became clear that the optical glass of the Example of this invention has a desired low Abbe number ((nu) d ).
- the optical glasses of the examples of the present invention all have a refractive index (n d ) of 1.70 or more, more specifically 1.91 or more, and this refractive index (n d ) is 2.20 or less. More specifically, it was 2.11 or less, and was within the desired range.
- the optical glass of Examples (No. A1 to No. A25) corresponding to the first optical glass had a refractive index (n d ) of 2.07 or less.
- the optical glass of Examples (No. C1 to No. C10) corresponding to the third optical glass had a refractive index (n d ) of 2.05 or less.
- the optical glass of Examples (No. D1 to No. D7) corresponding to the fourth optical glass had a refractive index (n d ) of 2.08 or less.
- the optical glasses of the examples of the present invention all have an Abbe number ( ⁇ d ) of 25 or less, and the partial dispersion ratios ( ⁇ g, F) as shown in FIGS. In relation to ⁇ d ), all were ( ⁇ 0.00160 ⁇ ⁇ d +0.63460) or more, and more specifically, ( ⁇ 0.00160 ⁇ ⁇ d +0.65000) or more.
- the partial dispersion ratio ( ⁇ g, F) is ( ⁇ 0.00563 ⁇ ⁇ d +0.75873) or less, more specifically, ( ⁇ 0.00563 ⁇ ⁇ d +0.75200) or less, and is within a desired range. It was in. For this reason, it became clear that the optical glass of the example of the present invention has a partial dispersion ratio ( ⁇ g, F) close to the normal line and small chromatic aberration.
- the optical glass of the example of the present invention had a glass transition point (Tg) of 550 ° C. or lower, more specifically 500 ° C. or lower.
- the optical glass of Examples (No. A1 to No. A25) had a glass transition point (Tg) of 460 ° C. or lower.
- the optical glasses of the examples (No. B1 to No. B22, No. C1 to No. C10) had a glass transition point (Tg) of 450 ° C. or lower.
- the optical glass of the example of the present invention had a glass transition point (Tg) of 200 ° C. or higher, more specifically 250 ° C. or higher.
- the optical glass of the comparative examples (No. A1 to No. A2) of the present invention had a glass transition point (Tg) higher than 460 ° C. For this reason, it was clarified that the optical glass of Examples (No. A1 to No. A25) of the present invention is easily softened at a lower temperature than the glass of Comparative Examples (No. A1 to No. A2). .
- the glass of the comparative examples (No. B2, No. C2) had a glass transition point (Tg) higher than 450 ° C. Therefore, the optical glasses of the examples of the present invention (No. B1 to No. B22, No. C1 to No. C10) are softened at a lower temperature than the glasses of the comparative examples (No. B2, No. C2). It became clear that it was easy to do.
- the glass of the comparative example (No. D1) had a glass transition point (Tg) higher than 500 ° C.
- Tg glass transition point
- ⁇ 70 (wavelength at 70% transmittance) was 500 nm or less, more specifically, 484 nm or less.
- the optical glass of Examples (No. A1 to No. A25) had a ⁇ 70 of 450 nm or less.
- ⁇ 70 was 474 nm or less.
- ⁇ 70 was 475 nm or less.
- ⁇ 5 (wavelength at a transmittance of 5%) was 450 nm or less, more specifically, 424 nm or less.
- ⁇ 5 was 400 nm or less.
- ⁇ 5 was 410 nm or less.
- ⁇ 5 was 411 nm or less.
- the glass of the comparative example (No. D1) ⁇ 70 was larger than 475 nm.
- the glass of Comparative Example (No.D3) the transmittance of light can not be measured is poor lambda 70.
- the optical glasses of Examples (No. D1 to No. D7) of the present invention are less colored than the glasses of Comparative Examples (No. D1 and No. D3) and have high transparency to visible light. Became clear.
- the optical glasses of the examples of the present invention all had a degree of wear of 1000 or less, and the degree of wear was 100 or more, more specifically 200 or more.
- the fourth optical glass had an abrasion degree of 600 or more.
- the glass of the reference examples (No. A1, No. B1) and the comparative examples (No. B1, No. C1, No. D2) had a degree of wear larger than 1000.
- the optical glass of the Example of this invention has a low abrasion degree compared with the glass of a reference example (No. A1) and a comparative example (No. B1, No. C1, No. D2), and the time of glass polishing It became clear that the workability was good.
- the optical glass of the example of the present invention is easily softened at a low temperature while having a refractive index (n d ) and an Abbe number ( ⁇ d ) within a desired range, and has high transparency in the visible range, In addition, it has become clear that polishing is easy during glass polishing.
- a precision press-molding preform was formed using the optical glass of the example of the present invention, and the precision press-molding preform was precision press-molded into a lens and a prism. In either case, it could be processed into various lens and prism shapes.
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Abstract
Description
Li2O成分 0~25.0%及び/又は
Na2O成分 0~30.0%及び/又は
K2O成分 0~30.0%及び/又は
Cs2O成分 0~30.0%
の各成分をさらに含有する(1)から(7)のいずれか記載の光学ガラス。
ZnO成分 0~30.0%及び/又は
La2O3成分 0~25.0%
の各成分をさらに含有する(1)から(12)のいずれか記載の光学ガラス。
MgO成分 0~15.0%及び/又は
CaO成分 0~20.0%及び/又は
SrO成分 0~20.0%及び/又は
BaO成分 0~20.0%
の各成分をさらに含有する(1)から(18)のいずれか記載の光学ガラス。
SiO2成分 0~30.0%及び/又は
GeO2成分 0~30.0%及び/又は
P2O5成分 0~30.0%及び/又は
Al2O3成分 0~30.0%及び/又は
In2O3成分 0~15.0%及び/又は
ZrO2成分 0~20.0%及び/又は
Ta2O5成分 0~20.0%及び/又は
Gd2O3成分 0~25.0%及び/又は
Y2O3成分 0~20.0%及び/又は
Yb2O3成分 0~20.0%及び/又は
Sb2O3成分 0~1.0%及び/又は
CeO2成分 0~1.0%
の各成分をさらに含有する(1)から(20)のいずれか記載の光学ガラス。
本発明の光学ガラスを構成する各成分の組成範囲を以下に述べる。本明細書中において、各成分の含有率は特に断りがない場合は、全て酸化物換算組成のガラス全物質量に対するモル%で表示されるものとする。ここで、「酸化物換算組成」は、本発明のガラス構成成分の原料として使用される酸化物、複合塩、金属弗化物等が溶融時に全て分解され酸化物へ変化すると仮定した場合に、当該生成酸化物の総物質量を100モル%として、ガラス中に含有される各成分を表記した組成である。
TeO2成分は、ガラス形成成分であり、ガラスの分散を高めつつ、ガラスの屈折率を高める成分である。特に、TeO2成分の含有率を40.0%以上にすることで、ガラスの分散及び屈折率が高められるため、所望のアッベ数(νd)及び屈折率を得ることができる。一方、TeO2成分の含有率を75.0%未満にすることで、ガラスの液相温度を低くすることでガラス形成時の耐失透性を高めることができる。従って、酸化物換算組成のガラス全物質量に対するTeO2成分の含有率は、好ましくは40.0%、より好ましくは43.0%を下限とし、最も好ましくは45.0%より多くする。また、このTeO2成分の含有率は、好ましくは75.0%未満とし、より好ましくは70.0%を上限とし、さらに好ましくは70.0%未満とし、最も好ましくは65.0%を上限とする。TeO2成分は、原料として例えばTeO2等を用いてガラス内に含有することができる。
次に、本発明の光学ガラスに含有すべきでない成分、及び含有することが好ましくない成分について説明する。
TeO2成分 40.0~75.0質量%
並びに
Bi2O3成分 0~55.0質量%及び/又は
Nb2O5成分 0~35.0質量%及び/又は
TiO2成分 0~15.0質量%及び/又は
WO3成分 0~55.0質量%及び/又は
Li2O成分 0~7.0質量%及び/又は
Na2O成分 0~12.0質量%及び/又は
K2O成分 0~18.0質量%及び/又は
Cs2O成分 0~40.0質量%及び/又は
Ga2O3成分 0~25.0質量%及び/又は
ZnO成分 0~25.0質量%及び/又は
La2O3成分 0~40.0質量%及び/又は
B2O3成分 0~30.0質量%及び/又は
MgO成分 0~8.0質量%及び/又は
CaO成分 0~8.0質量%及び/又は
SrO成分 0~15.0質量%及び/又は
BaO成分 0~20.0質量%及び/又は
SiO2成分 0~13.0質量%及び/又は
GeO2成分 0~20.0質量%及び/又は
P2O5成分 0~30.0質量%及び/又は
Al2O3成分 0~20.0質量%及び/又は
In2O3成分 0~25.0質量%及び/又は
ZrO2成分 0~15.0質量%及び/又は
Ta2O5成分 0~40.0質量%及び/又は
Gd2O3成分 0~40.0質量%及び/又は
Y2O3成分 0~30.0質量%及び/又は
Yb2O3成分 0~35.0質量%及び/又は
Sb2O3成分 0~1.0質量%及び/又は
CeO2成分 0~1.0質量%
TeO2成分 40.0~75.0質量%及び
Bi2O3成分 1.0~55.0質量%、
並びに
Li2O成分 0~7.0質量%及び/又は
Na2O成分 0~12.0質量%及び/又は
K2O成分 0~18.0質量%及び/又は
Cs2O成分 0~40.0質量%及び/又は
La2O3成分 0~40.0質量%及び/又は
MgO成分 0~8.0質量%及び/又は
CaO成分 0~8.0質量%及び/又は
SrO成分 0~15.0質量%及び/又は
BaO成分 0~20.0質量%及び/又は
SiO2成分 0~13.0質量%及び/又は
B2O3成分 0~30.0質量%及び/又は
GeO2成分 0~20.0質量%及び/又は
P2O5成分 0~30.0質量%及び/又は
Al2O3成分 0~20.0質量%及び/又は
Ga2O3成分 0~25.0質量%及び/又は
In2O3成分 0~25.0質量%及び/又は
ZnO成分 0~25.0質量%及び/又は
ZrO2成分 0~15.0質量%及び/又は
WO3成分 0~35.0質量%及び/又は
Ta2O5成分 0~40.0質量%及び/又は
TiO2成分 0~15.0質量%及び/又は
Nb2O5成分 0~35.0質量%及び/又は
Gd2O3成分 0~40.0質量%及び/又は
Y2O3成分 0~30.0質量%及び/又は
Yb2O3成分 0~35.0質量%及び/又は
Sb2O3成分 0~1.0質量%及び/又は
CeO2成分 0~1.0質量%
TeO2成分 40.0~75.0質量%及び
Nb2O5成分 1.0~35.0質量%、
並びに
Li2O成分 0~7.0質量%及び/又は
Na2O成分 0~12.0質量%及び/又は
K2O成分 0~18.0質量%及び/又は
Cs2O成分 0~40.0質量%及び/又は
ZnO成分 0~25.0質量%及び/又は
La2O3成分 0~40.0質量%及び/又は
WO3成分 0~35.0質量%及び/又は
B2O3成分 0~30.0質量%及び/又は
MgO成分 0~8.0質量%及び/又は
CaO成分 0~8.0質量%及び/又は
SrO成分 0~15.0質量%及び/又は
BaO成分 0~20.0質量%及び/又は
SiO2成分 0~13.0質量%及び/又は
GeO2成分 0~20.0質量%及び/又は
P2O5成分 0~30.0質量%及び/又は
Al2O3成分 0~20.0質量%及び/又は
Ga2O3成分 0~25.0質量%及び/又は
In2O3成分 0~25.0質量%及び/又は
ZrO2成分 0~15.0質量%及び/又は
Ta2O5成分 0~40.0質量%及び/又は
TiO2成分 0~15.0質量%及び/又は
Bi2O3成分 0~45.0質量%及び/又は
Gd2O3成分 0~40.0質量%及び/又は
Y2O3成分 0~30.0質量%及び/又は
Yb2O3成分 0~35.0質量%及び/又は
Sb2O3成分 0~1.0質量%及び/又は
CeO2成分 0~1.0質量%
TeO2成分 40.0~75.0質量%及び
TiO2成分 1.0~15.0質量%、
並びに
Li2O成分 0~7.0質量%及び/又は
Na2O成分 0~12.0質量%及び/又は
K2O成分 0~18.0質量%及び/又は
Cs2O成分 0~40.0質量%及び/又は
ZnO成分 0~25.0質量%及び/又は
La2O3成分 0~40.0質量%及び/又は
WO3成分 0~35.0質量%及び/又は
B2O3成分 0~30.0質量%及び/又は
MgO成分 0~8.0質量%及び/又は
CaO成分 0~8.0質量%及び/又は
SrO成分 0~15.0質量%及び/又は
BaO成分 0~20.0質量%及び/又は
SiO2成分 0~13.0質量%及び/又は
GeO2成分 0~20.0質量%及び/又は
P2O5成分 0~30.0質量%及び/又は
Al2O3成分 0~20.0質量%及び/又は
Ga2O3成分 0~25.0質量%及び/又は
In2O3成分 0~25.0質量%及び/又は
ZrO2成分 0~15.0質量%及び/又は
Ta2O5成分 0~40.0質量%及び/又は
Nb2O5成分 0~35.0質量%及び/又は
Bi2O3成分 0~45.0質量%及び/又は
Gd2O3成分 0~40.0質量%及び/又は
Y2O3成分 0~30.0質量%及び/又は
Yb2O3成分 0~35.0質量%及び/又は
Sb2O3成分 0~1.0質量%及び/又は
CeO2成分 0~1.0質量%
TeO2成分 40.0~75.0質量%及び
WO3成分 1.0~55.0質量%、
並びに
Li2O成分 0~7.0質量%及び/又は
Na2O成分 0~12.0質量%及び/又は
K2O成分 0~18.0質量%及び/又は
Cs2O成分 0~40.0質量%及び/又は
ZnO成分 0~25.0質量%及び/又は
La2O3成分 0~40.0質量%及び/又は
B2O3成分 0~30.0質量%及び/又は
MgO成分 0~8.0質量%及び/又は
CaO成分 0~8.0質量%及び/又は
SrO成分 0~15.0質量%及び/又は
BaO成分 0~20.0質量%及び/又は
SiO2成分 0~13.0質量%及び/又は
GeO2成分 0~20.0質量%及び/又は
P2O5成分 0~30.0質量%及び/又は
Al2O3成分 0~20.0質量%及び/又は
Ga2O3成分 0~25.0質量%及び/又は
In2O3成分 0~25.0質量%及び/又は
ZrO2成分 0~15.0質量%及び/又は
Ta2O5成分 0~40.0質量%及び/又は
TiO2成分 0~15.0質量%及び/又は
Nb2O5成分 0~35.0質量%及び/又は
Bi2O3成分 0~45.0質量%及び/又は
Gd2O3成分 0~40.0質量%及び/又は
Y2O3成分 0~30.0質量%及び/又は
Yb2O3成分 0~35.0質量%及び/又は
Sb2O3成分 0~1.0質量%及び/又は
CeO2成分 0~1.0質量%
本発明の光学ガラスは、例えば以下のように作製される。すなわち、上記原料を各成分が所定の含有率の範囲内になるように均一に混合し、作製した混合物を石英坩堝又はアルミナ坩堝に投入して粗溶融した後、金坩堝、白金坩堝、白金合金坩堝又はイリジウム坩堝に入れて500~1200℃の温度範囲で溶融し、攪拌均質化して泡切れ等を行った後、適当な温度に下げてから金型に鋳込み、徐冷することにより作製される。
本発明の光学ガラスは、所定の高い屈折率(nd)を有するとともに、高い分散を有する必要がある。特に、本発明の光学ガラスの屈折率(nd)は、好ましくは1.70、より好ましくは1.75、最も好ましくは1.80を下限とし、好ましくは2.20、より好ましくは2.18、最も好ましくは2.15を上限とする。また、本発明の光学ガラスのアッベ数(νd)は、好ましくは30、より好ましくは25、さらに好ましくは24、最も好ましくは23を上限とする。これらにより、光学設計の自由度が広がるため、さらに素子の薄型化を図っても、大きな光の屈折量を得ることができる。なお、本発明の光学ガラスのアッベ数(νd)の下限は特に限定しないが、本発明によって得られるガラスのアッベ数(νd)は、概ね10以上、具体的には12以上、さらに具体的には14以上であることが多い。
本発明の光学ガラスは、様々な光学素子及び光学設計に有用であるが、その中でも特に、レンズやプリズム、ミラー等のように、ガラス内に可視光を透過させる光学素子の用途に用いられることが好ましい。これにより、この光学ガラスを用いた光学素子による色収差が低減されるため、カメラやプロジェクタ等の光学機器に用いたときに、光学素子や光学系の小型化を図りつつ、高精細で高精度な結像特性を実現できる。ここで、本発明の光学ガラスからなる光学素子を作製するには、切削及び研磨加工を省略することが可能であるため、溶融状態のガラスを白金等の流出パイプの流出口から滴下して球状等の精密プレス成形用プリフォームを作製し、この精密プレス成形用プリフォームに対して精密プレス成形を行うことが好ましい。
摩耗度={(試料の摩耗質量/比重)/(標準試料の摩耗質量/比重)}×100
により計算した。
Claims (20)
- 酸化物換算組成のガラス全物質量に対して、モル%でTeO2成分を40.0%以上75.0%未満、Bi2O3成分、Nb2O5成分、WO3成分及びTiO2成分からなる群から選択される1種以上の成分を1.0%以上40.0%以下含有し、30以下のアッベ数(νd)を有する光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%でBi2O3成分を1.0%以上40.0%以下含有する請求項1記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%でNb2O5成分を1.0%以上25.0%以下含有する請求項1記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%でTiO2成分を1.0%以上30.0%以下含有する請求項1記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%でWO3成分を1.0%以上40.0%以下含有する請求項1記載の光学ガラス。
- 分光透過率が70%を示す波長(λ70)が500nm以下である請求項1から5のいずれか記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%で
Li2O成分 0~25.0%及び/又は
Na2O成分 0~30.0%及び/又は
K2O成分 0~30.0%及び/又は
Cs2O成分 0~30.0%
の各成分をさらに含有する請求項1から6のいずれか記載の光学ガラス。 - 酸化物換算組成のガラス全物質量に対する物質量和Li2O+Na2O+K2O+Cs2Oが30.0%以下である請求項7記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%で
Ga2O3成分 0~20.0%及び/又は
ZnO成分 0~30.0%及び/又は
La2O3成分 0~25.0%及び/又は
B2O3成分 0~40.0%
の各成分をさらに含有する請求項1から8のいずれか記載の光学ガラス。 - 実質的に鉛化合物を含有しない請求項1から9のいずれか記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%で
MgO成分 0~15.0%及び/又は
CaO成分 0~20.0%及び/又は
SrO成分 0~20.0%及び/又は
BaO成分 0~20.0%
の各成分をさらに含有する請求項1から10のいずれか記載の光学ガラス。 - 酸化物換算組成のガラス全物質量に対する物質量和MgO+CaO+SrO+BaOが20.0%以下である請求項11記載の光学ガラス。
- 酸化物換算組成のガラス全物質量に対して、モル%で
SiO2成分 0~30.0%及び/又は
GeO2成分 0~30.0%及び/又は
P2O5成分 0~30.0%及び/又は
Al2O3成分 0~30.0%及び/又は
In2O3成分 0~15.0%及び/又は
ZrO2成分 0~20.0%及び/又は
Ta2O5成分 0~20.0%及び/又は
Gd2O3成分 0~25.0%及び/又は
Y2O3成分 0~20.0%及び/又は
Yb2O3成分 0~20.0%及び/又は
Sb2O3成分 0~1.0%及び/又は
CeO2成分 0~1.0%
の各成分をさらに含有する請求項1から12のいずれか記載の光学ガラス。 - 1.70以上2.20以下の屈折率(nd)を有する請求項1から13のいずれか記載の光学ガラス。
- ガラス転移点(Tg)が200℃以上550℃以下である請求項1から14のいずれか記載の光学ガラス。
- 摩耗度(Aa)が100以上1000以下である請求項1から15のいずれか記載の光学ガラス。
- 部分分散比(θg,F)がアッベ数(νd)との間で、νd≦25の範囲において(-0.00160×νd+0.63460)≦(θg,F)≦(-0.00563×νd+0.75873)の関係を満たし、且つ、νd>25の範囲において(-0.00250×νd+0.65710)≦(θg,F)≦(-0.00340×νd+0.70300)の関係を満たす請求項1から16のいずれか記載の光学ガラス。
- 請求項1から17のいずれか記載の光学ガラスからなる光学素子。
- 請求項1から17のいずれか記載の光学ガラスからなる精密プレス成形用プリフォーム。
- 請求項19記載の精密プレス成形用プリフォームを精密プレス成形してなる光学素子。
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JP2017502902A (ja) * | 2013-12-19 | 2017-01-26 | オスラム ゲーエムベーハーOSRAM GmbH | ガラス組成物、部品、および部品を製造するための方法 |
US10233114B2 (en) | 2013-12-19 | 2019-03-19 | Osram Gmbh | Glass composition, component, and method for producing a component |
JP2016150881A (ja) * | 2015-02-18 | 2016-08-22 | 株式会社オハラ | 光学ガラス |
FR3036396A1 (fr) * | 2015-05-22 | 2016-11-25 | Axon Cable Sa | Composition de verre pour le scellement de connecteur micro-d |
WO2016189225A1 (fr) * | 2015-05-22 | 2016-12-01 | Axon Cable | Composition de verre pour le scellement de connecteur micro-d |
CN107690423A (zh) * | 2015-05-22 | 2018-02-13 | 法国亿讯电缆集团 | 用于微型‑d连接器密封的玻璃组合物 |
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WO2022059355A1 (ja) * | 2020-09-18 | 2022-03-24 | Agc株式会社 | ガラス |
Also Published As
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JPWO2010126097A1 (ja) | 2012-11-01 |
CN102414137A (zh) | 2012-04-11 |
JP5823859B2 (ja) | 2015-11-25 |
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