WO2009133889A1 - 光学ガラス - Google Patents
光学ガラス Download PDFInfo
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- WO2009133889A1 WO2009133889A1 PCT/JP2009/058358 JP2009058358W WO2009133889A1 WO 2009133889 A1 WO2009133889 A1 WO 2009133889A1 JP 2009058358 W JP2009058358 W JP 2009058358W WO 2009133889 A1 WO2009133889 A1 WO 2009133889A1
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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
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
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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
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
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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
- C03C3/253—Silica-free oxide glass compositions containing germanium
Definitions
- the present invention relates to a bismuth-based optical glass having an extremely large partial dispersion ratio [ ⁇ g, F]. More specifically, the partial dispersion ratio [ ⁇ g, F] is 0.63 or more and the Abbe number [ ⁇ d] is 27 or less. It relates to optical glass.
- the lens system of an optical device is usually designed by combining a plurality of glass lenses having different optical properties.
- optical glasses having optical characteristics that have not been used in the past have been used as spherical and aspherical lenses in order to further increase the degree of freedom in designing lens systems of diversifying optical devices.
- optical lenses with different refractive indexes and dispersion tendencies have been developed for the purpose of reducing aberrations in optical design.
- optical glasses having a specific partial dispersion ratio [ ⁇ g, F] have a remarkable effect in correcting aberrations, and various glasses have been developed in order to increase the degree of freedom in optical design.
- Equation (1) The partial dispersion ratio [ ⁇ g, F] representing the partial dispersion in the short wavelength region is shown in Equation (1).
- ⁇ g, F (ng ⁇ n F ) / (n F ⁇ n C ) (1)
- optical glass has an approximately linear inverse relationship between the partial dispersion ratio ⁇ g, F representing the partial dispersion in the short wavelength region and the Abbe number ⁇ d. It is said to be anomalous dispersion glass.
- the straight line representing this inverse proportionality plots ⁇ g, F, and ⁇ d of NSL7 and PBM2 on orthogonal coordinates that employ the partial dispersion ratio [ ⁇ g, F] on the vertical axis and the Abbe number [ ⁇ d] on the horizontal axis. It is represented by a straight line connecting points and is called a normal line (see FIG. 1).
- Normal glass which is the standard for the normal line, is different for each optical glass manufacturer, but each manufacturer has the same slope and intercept
- NSL7 and PBM2 are optical glasses manufactured by OHARA, Inc., and the Abbe number of PBM2 [ ⁇ d] is 36.3, partial dispersion ratio [ ⁇ g, F] is 0.5828, NSL7 Abbe number [ ⁇ d] is 60.5, and partial dispersion ratio [ ⁇ g, F] is 0.5436).
- anomalous dispersion the distance from the normal line in the vertical axis direction is used as an index. When these anomalous dispersion glass lenses are used in combination with other lenses, it becomes possible to correct chromatic aberration in a wide wavelength range from ultraviolet to infrared.
- the anomalous dispersion glass as described above is disclosed in various documents.
- Patent Documents 1 to 5 disclose optical glasses having a specific value of the partial dispersion ratio [ ⁇ g, F].
- Abbe's number [[nu] d] Discloses an optical glass having a small partial dispersion ratio [ ⁇ g, F] peculiar to the medium dispersion region of 28 to 55.
- Patent Documents 4 and 5 disclose SiO 2 —B 2 O 3 —TiO 2 —Al 2 O 3 and Bi 2 O 3 —B 2 O 3 based glasses having an Abbe number [ ⁇ d] of 32 to An optical glass having a large partial dispersion ratio [ ⁇ g, F] peculiar to the medium dispersion region of 55 is disclosed. Among these optical glasses, the largest partial dispersion ratio [ ⁇ g, F] is about 0.59 in Patent Document 5, but it is still insufficient to satisfy the recent optical design requirements.
- the present invention has been made in view of the problems as described above.
- an optical glass containing Bi 2 O 3 the Abbe number having a characteristic value while having a very large partial dispersion ratio [ ⁇ g, F].
- An optical glass having [ ⁇ d] is provided.
- the present inventor has a large partial dispersion ratio [ ⁇ g, F] in a specific composition region of the optical glass containing Bi 2 O 3 , and It has been found that an optical glass having an Abbe number [ ⁇ d] which has not been obtained so far has been obtained, and the present invention has been completed. More specifically, the following is provided.
- the total content of Bi 2 O 3 component, BaO component, ZnO component, B 2 O 3 component, SiO 2 component, and Sb 2 O 3 component is less than 96% by mass% based on oxide (1 ) Optical glass.
- the partial dispersion ratio [ ⁇ g, F] is 0.63 or more, the Abbe number [ ⁇ d] is 27 or less, and the devitrification resistance is good.
- An extremely dispersive glass extremely useful in design can be provided.
- optical glass of the present invention will be described.
- each component constituting the optical glass of the present invention The composition of each component constituting the optical glass of the present invention will be described below.
- the content of each component is expressed in terms of mass% based on the oxide.
- the “oxide standard” means that the oxide, composite salt, metal fluoride, etc. used as the raw material of the glass component of the present invention are all decomposed and converted into oxide when melted.
- the sum of the masses of the oxides is defined as 100% by mass, and the content of each component contained in the glass is described.
- the total amount of F in which a part or all of the oxide is substituted with fluoride is the content of fluorine that can be present in the glass composition of the present invention, based on 100% of the oxide reference composition. , Expressed in mass% when calculated as F atoms.
- the Bi 2 O 3 component is an indispensable component for the glass of the present invention, such as increasing the partial dispersion ratio [ ⁇ g, F], effective for lowering the dispersion, and further lowering the Tg and improving water resistance. .
- the content of Bi 2 O 3 component is preferably 45%, more preferably 55%, most preferably 64% is the lower limit, preferably 95%, more preferably 90%, most preferably 85%. It is an upper limit.
- the SiO 2 component is an optional component that is effective for improving transmittance, improving glass stability, and reducing dispersion.
- the upper limit of the content of the SiO 2 component is preferably 20%, more preferably 15%, and most preferably 10%.
- the B 2 O 3 component is an optional component that has an effect of improving glass stability and maintaining a high partial dispersion ratio [ ⁇ g, F].
- the upper limit of the content of the B 2 O 3 component is preferably 30%, more preferably 23%, and most preferably 15%.
- SiO 2 and B 2 O 3 are optional components, but at least one of them, in particular, B 2 O 3 is preferably contained in excess of 0%.
- the sum of the contents of B 2 O 3 and SiO 2 is preferably more than 0, more preferably 0.5%, and most preferably 1%.
- the upper limit of the sum of the contents of B 2 O 3 and SiO 2 is preferably 50%, more preferably 45%, and most preferably 35%.
- the Li 2 O component is an optional component that improves glass stability and is effective in lowering Tg. However, if the content is too large, the glass stability tends to be lowered, and the mechanical strength tends to be lowered. Therefore, the upper limit of the content of the Li 2 O component is preferably 25%, more preferably 20%, and most preferably 15%.
- the Na 2 O component is a useful optional component that adjusts the partial dispersion ratio [ ⁇ g, F] and the Abbe number [ ⁇ d] by adjusting the content thereof.
- the upper limit of the content of the Na 2 O component is preferably 25%, more preferably 20%, and most preferably 15%.
- the content is preferably more than 0%, more preferably 1% or more, and most preferably 2% or more.
- the K 2 O component is a useful optional component that adjusts the partial dispersion ratio [ ⁇ g, F] and the Abbe number [ ⁇ d] by adjusting the content thereof.
- the effect is particularly remarkable among alkali metals.
- the upper limit of the content of the K 2 O component is preferably 25%, more preferably 20%, and most preferably 15%.
- a glass having desired optical properties can be produced in the present invention without including a K 2 O component.
- a K 2 O component is included.
- the amount is preferably more than 0%, more preferably 1% or more, most preferably 2% or more.
- the Rb 2 O component is a useful optional component that adjusts the partial dispersion ratio [ ⁇ g, F] and the Abbe number [ ⁇ d] by adjusting the content thereof.
- the Rb 2 O component is small in yield and unsuitable as a raw material for optical glass, and if contained excessively, it tends to lower the chemical durability and mechanical strength like other alkali metal components. Therefore, the upper limit of the content of the Rb 2 O component is preferably 25%, more preferably 20%, and most preferably 15%.
- the Cs 2 O component is a useful optional component that adjusts the partial dispersion ratio [ ⁇ g, F] and the Abbe number [ ⁇ d] by adjusting the content thereof.
- the upper limit of the content of the Rb 2 O component is preferably 25%, more preferably 20%, and most preferably 15%.
- the Rn 2 O component (Rn is one or more selected from Li, Na, K, Rb, and Cs) includes the partial dispersion ratio [ ⁇ g, F] and the Abbe characteristic of the glass of the present invention. This is a useful component for adjusting the number [ ⁇ d] to a desired value. However, if the content is too large, the desired partial dispersion ratio [ ⁇ g, F] and Abbe number [ ⁇ d] are hardly realized, and the glass stability is significantly impaired. Therefore, the content of the Rn 2 O component (Rn is at least one selected from Li, Na, K, Rb, Cs) is preferably more than 0, more preferably 0.5%, most preferably 1%. It is the lower limit. Further, the upper limit of the content of the Rn 2 O component (Rn is one or more selected from Li, Na, K, Rb, and Cs) is preferably 25%, more preferably 20%, and most preferably 15%. .
- the Y 2 O 3 component is an optional component useful for adjusting the dispersion of the glass.
- the upper limit of the content of the Y 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the La 2 O 3 component is an optional component useful for reducing the dispersion of glass. However, if the content is too large, the glass stability tends to be lowered. Accordingly, the upper limit of the content of the La 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the Gd 2 O 3 component is an optional component useful for adjusting the dispersion of the glass.
- the upper limit of the content of the Gd 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the Yb 2 O 3 component is an optional component useful for adjusting the dispersion of the glass.
- the upper limit of the content of the Yb 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the desired optical glass of the present invention can be produced.
- the total content of the rare earth oxide component is 3% or less, particularly in terms of mass% based on oxide.
- the Al 2 O 3 component is an optional component useful for improving the chemical durability and mechanical strength of the glass. However, if the content is too large, the meltability tends to be lowered. Therefore, the upper limit of the content of the Al 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the TiO 2 component is an optional component useful for highly dispersing the glass. However, if the content is too large, the glass stability tends to be lowered. Accordingly, the upper limit of the content of the TiO 2 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the Nb 2 O 5 component is an optional component useful for improving the partial dispersion ratio [ ⁇ g, F] of the glass.
- the upper limit of the content of the Nb 2 O 5 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the WO 3 component is an optional component useful for improving the partial dispersion ratio [ ⁇ g, F] of the glass and lowering the Tg.
- the upper limit of the content of the WO 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the Ta 2 O 5 component is an optional component useful for improving glass stability. However, if the content is too large, the glass stability tends to be lowered, and the cost is greatly increased. Therefore, the upper limit of the content of the Ta 2 O 5 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the ZrO 2 component is an optional component useful for improving the chemical durability and mechanical strength of the glass. However, if the content is too large, the glass stability tends to be lowered. Therefore, the upper limit of the content of the ZrO 2 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the ZnO component is an optional component useful for improving the devitrification resistance of glass.
- the upper limit of the content of the ZnO component is preferably 20%, more preferably 15%, and most preferably 10%.
- the inclusion of the ZnO component The amount is preferably more than 0%, more preferably 0.5% or more, most preferably 1% or more.
- MgO component is an optional component useful for low dispersion of glass.
- the upper limit of the content of the MgO component is preferably 20%, more preferably 15%, and most preferably 10%.
- CaO component is an optional component useful for reducing the dispersion of glass and improving devitrification resistance.
- the upper limit of the content of the CaO component is preferably 20%, more preferably 15%, and most preferably 10%.
- the SrO component is an optional component useful for improving devitrification resistance.
- the content is too large, the devitrification resistance is likely to be greatly reduced, and it is difficult to obtain the desired partial dispersion ratio [ ⁇ g, F] and Abbe number [ ⁇ d].
- the upper limit of the SrO component content is preferably 20%, more preferably 15%, and most preferably 10%.
- BaO component is an optional component useful for improving devitrification resistance.
- the upper limit of the content of the BaO component is preferably 20%, more preferably 15%, and most preferably 10%.
- RO component (R is one or more selected from Mg, Ca, Sr, Ba, Zn) is a useful component for adjusting all physical properties such as devitrification resistance, dispersion, and mechanical strength.
- the upper limit of the content of the RO component is preferably 35%, more preferably 30%, and most preferably 25%.
- the lower limit of the content of the RO component is preferably 0%. More preferably 0.5%, most preferably 1%.
- Bi 2 O 3 component and BaO component are used in order to maintain good clarity and devitrification resistance while obtaining a desired partial dispersion ratio [ ⁇ g, F] and Abbe number [ ⁇ d].
- ZnO component, B 2 O 3 component, SiO 2 component, Sb 2 O 3 component total content is preferably less than 96%, more preferably 93% or less, 89% or less Is most preferred.
- the mass percentage based on oxides, Bi 2 O 3 B 2 O 3 ingredient content ratio relative to component preferably less than 0.20, more preferably 0.17 or less, and most preferably 0.15 or less.
- the RO component R is Mg, Ca
- Sr, Ba, Zn is preferably less than 0.292, more preferably 0.2 or less, and most preferably 0.1 or less.
- the content ratio of the RO component to the three components is preferably less than 1.01, more preferably 0.82 or less, and most preferably 0.64 or less.
- the GeO 2 component is an optional component useful for improving the devitrification resistance of the glass.
- the upper limit of the content of the GeO 2 component is preferably 20%, more preferably 15%, and most preferably 10%.
- the P 2 O 5 component is an optional component useful for improving the transmittance of glass. However, if the content is too large, the meltability tends to be lowered. Accordingly, the upper limit of the content of the P 2 O 5 component is preferably 10%, more preferably 5%, and most preferably 3%.
- the TeO 2 component is an optional component that has an effect of promoting glass clarification. However, if the content is too large, the devitrification resistance tends to decrease. Accordingly, the upper limit of the content of the TeO 2 component is preferably 20%, more preferably 15%, and most preferably 10%.
- the Sb 2 O 3 component is an optional component that has an effect of promoting glass clarification. However, when there is too much the content, devitrification resistance will fall. Therefore, the upper limit of the content of the Sb 2 O 3 component is preferably 3%, more preferably 2%, and most preferably 1%.
- the CeO 2 component is an optional component that has the effect of increasing the partial dispersion ratio [ ⁇ g, F] of the glass. However, if the content is too large, the transmittance tends to be greatly reduced. Therefore, the upper limit of the CeO 2 component content is preferably 3%, more preferably 2%, and most preferably 1%.
- the Tl 2 O 3 component is a component that can be optionally added with an effect of adjusting the partial dispersion ratio [ ⁇ g, F] and Abbe number [ ⁇ d] of the glass.
- the upper limit of the content of the Tl 2 O 3 component is preferably 10%, more preferably 5%, and most preferably 3%.
- F is an optional component effective for reducing the glass dispersion and improving the meltability.
- the upper limit of the total amount of F in which part or all of the oxide is substituted with fluoride is 10% when expressed in terms of mass% when calculated as F atoms based on 100 mass% of the oxide standard composition. Is preferable, 5% is more preferable, and 1% is most preferable. More preferably, F is not included.
- the glass of the present invention can contain other components as necessary within a range not impairing the properties thereof.
- the transition metal components such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag, and Mo other than Ti are used to color the glass even when they are contained in small amounts alone or in combination.
- the optical glass using a wavelength in the visible region does not substantially contain the above components.
- substantially does not contain means that it is not added artificially unless it is mixed as an impurity.
- the Th component can be contained for the purpose of increasing the refractive index or improving the stability as glass, and the Cd and Tl components can be contained for the purpose of lowering the Tg.
- the Th, Cd, and Os tends to be refrained from being used as a harmful chemical substance component in recent years, not only the glass manufacturing process but also the processing process and the disposal after commercialization are used. Require countermeasures. Accordingly, when importance is placed on environmental influences, it is preferable that the Th, Cd, and Os components are not substantially included.
- the Pb component should not be contained in the glass of the present invention in order to increase the manufacturing cost because it is necessary to take measures for environmental measures when manufacturing, processing, and discarding the glass.
- As 2 O 3 component is a component that is used to improve the blowout of foam (destructive property) when melting glass, but measures for environmental measures when manufacturing, processing, and disposing of glass. Therefore, it is preferable not to be contained in the glass of the present invention.
- the composition of the glass composition of the present invention is expressed by mass%, it cannot be expressed directly in the description of mol%.
- the mol% display of the content of each component present in the glass composition that satisfies the various properties required in the present invention is generally the following value in terms of the oxide equivalent composition.
- Bi 2 O 3 20% or more, SiO 2 0-15% or less, B 2 O 3 0-30% or less, and Al 2 O 3 0-15% and / or TiO 2 0-15 and / or Nb 2 O 5 0-15% and / or WO 3 0-15% and / or Ta 2 O 5 0-15% and / or ZrO 2 0-15% and / or ZnO 0-15% and / or MgO 0-15% and / or CaO 0-15% and / or SrO 0-15% and And / or BaO 0-20% and / or Li 2 O 0-25% and / or Na 2 O 0-25% and / or K 2 O 0-25% and / or Rb 2 O 0-25% and / or Cs 2 O 0-25% and / or Y 2 O 3 0-15% and / or La 2 O 3 0-15% and / or Gd 2 O 3 0-15% and / or Yb 2 O
- an optical glass having an optical performance with a partial dispersion ratio [ ⁇ g, F] of 0.63 or more and an Abbe number [ ⁇ d] of 27 or less can be obtained, and the degree of freedom in optical design is greatly increased.
- the partial dispersion ratio [ ⁇ g, F] is preferably 0.63 or more, more preferably 0.64 or more, and most preferably 0.65 or more. Below this range, it is difficult to say that the optical performance is characteristic in optical design.
- the Abbe number [ ⁇ d] is preferably 27 or less, more preferably 26 or less, and most preferably 25 or less.
- the optical glass of the present invention can be typically used for lens, prism and mirror applications by being precision press-molded.
- the optical glass of the present invention can be used as a preform material for press molding, or a molded product can be produced by directly pressing the molten glass of the present invention.
- its production method and precision press molding method are not particularly limited, and may be as known.
- the preform material may be produced directly from molten glass using, for example, a glass gob forming method described in JP-A-8-319124, or an optical glass manufacturing method and manufacturing apparatus described in JP-A-8-73229.
- the strip material may be manufactured by cold working such as grinding and polishing.
- the optical glass of the present invention has good physical properties in terms of mechanical properties, chemical durability, thermal properties, and mass productivity in addition to the required optical properties.
- Abrasion degree is a physical property that is used as an index of workability of optical glass.
- the optical glass of the present invention is preferably 700 or less, more preferably 680, when measured by a measurement method according to “Japan Optical Glass Industry Standard JOGIS10-1994 Measurement Method of Optical Glass Wear”.
- the wear degree is most preferably 670 or less.
- Chemical durability is a physical property that is used as an index of processability and environmental resistance of optical glass. If the class is too large, defects in processability and environmental resistance occur.
- the glass of the present invention is preferably 5 or less when measured by a measuring method according to “Japan Optical Glass Industry Association Standard JOGIS06-1999 Optical Glass Chemical Durability Measuring Method (Powder Method)”. Most preferably, it has acid resistance and water resistance of 4 or less.
- Thermal characteristics are physical properties that are used as indicators of thermal shock resistance of optical glass and moldability during mold press molding.
- the glass transition point [Tg] is low, mold press molding can be performed at a low temperature, and the energy can be reduced and the life of an expensive mold can be extended.
- the thermal expansion coefficient [ ⁇ ] is large, the glass is easily broken when the glass is heated.
- the glass of the present invention was measured for glass transition temperature [Tg] and coefficient of thermal expansion [ ⁇ ] by a measuring method according to “Measurement Method of Thermal Expansion of Japan Optical Glass Industry Association Standard JOGIS08-2003 Optical Glass”.
- the glass transition point [Tg] is preferably 530 ° C.
- the thermal expansion coefficient [ ⁇ ] is 190 or lower, more preferably the glass transition point [Tg] is 500 ° C. or lower and the thermal expansion coefficient [ ⁇ ] Is 180 or less, most preferably the glass transition point [Tg] is 470 ° C. or less, and the thermal expansion coefficient [ ⁇ ] is 170 or less.
- the liquid phase temperature and the viscosity at the liquid phase temperature are physical properties that are used as indicators during glass melt molding.
- the liquidus temperature is high, devitrification is likely to occur due to heat retention in a temperature region below that temperature, and therefore there is a disadvantage that a viscosity suitable for molding cannot be obtained by lowering the temperature. It is below, More preferably, it is 830 degrees C or less, Most preferably, it is 800 degrees C or less.
- the viscosity of the glass of the present invention at the liquidus temperature is preferably 0.1 Pa ⁇ s or more, preferably 0.12 Pa ⁇ s or more, and most preferably 0.15 Pa ⁇ s or more.
- the liquid phase temperature of the glass of the present invention is arranged at 10 mm intervals in a devitrification test furnace having a temperature gradient of 400 to 1100 ° C., held for 30 minutes, and then observed for devitrification with a microscope with a magnification of 80 times. Was measured.
- the remaining foam of the optical glass melt-molded product is a physical property that is used as an index for evaluating optical glass clarity. If the foam level is large, the clarity is poor and problems occur during mass production.
- the foam of the glass of the present invention is preferably 4 to 1 grade, more preferably 3 to 1 grade, when measured by a measuring method according to “JOGIS12-1994 Optical Glass Bubble Measuring Method”. .
- Devitrification at the time of reheating is an important index in the reheating process in the manufacturing process, for example, precision press molding or reheat press molding. If devitrification is likely to precipitate during reheating, a problem that devitrification occurs inside the reheating process during the manufacturing process is likely to occur. In the glass of the present invention, devitrification does not precipitate inside in the reheating test (reheating test: test piece 15 mm ⁇ 15 mm ⁇ 30 mm is reheated and is 80 ° C. higher than the glass transition point [Tg] of the optical glass. The temperature is kept for 30 minutes, then cooled to room temperature, and the two opposing surfaces of the test piece are polished to a thickness of 10 mm and visually observed).
- reheating test test piece 15 mm ⁇ 15 mm ⁇ 30 mm is reheated and is 80 ° C. higher than the glass transition point [Tg] of the optical glass. The temperature is kept for 30 minutes, then cooled to room temperature, and the two opposing
- the raw materials were weighed so as to have a glass weight of 400 g with the compositions shown in Tables 1 to 16 and mixed uniformly.
- the raw material is melted at 750 ° C. to 950 ° C. for 2 to 3 hours using a quartz crucible or a gold crucible, the temperature is lowered to about 800 to 650 ° C., and the temperature is kept for about 1 hour, and then molten glass is cast into a mold A glass was prepared.
- the obtained glass properties are shown in Tables 1 to 16.
- surface is represented by the mass% of an oxide basis.
- the refractive index [nd], Abbe number [ ⁇ d], and partial dispersion ratio [ ⁇ g, F] were measured based on Japan Optical Glass Industry Association Standard JOGIS01-2003.
- the annealing was performed in a slow cooling furnace at a slow cooling rate of ⁇ 25 ° C./hr.
- the glass according to the example of the present invention has a characteristic optical constant that the partial dispersion ratio [ ⁇ g, F] is 0.63 or more, the Abbe number [ ⁇ d] is 27 or less, and the liquidus temperature is low. Excellent stability.
- some comparative glasses have a high refractive index [nd], but the values of the partial dispersion ratio [ ⁇ g, F] and the Abbe number [ ⁇ d] are out of the range of a general high refractive index glass. Absent.
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Abstract
Description
θg,F=(ng-nF)/(nF-nC) ・・・・・・(1)
部分分散比[θg,F]が0.63以上、アッベ数が27以下である光学ガラス。
Bi2O3 64%以上、及び/又は
RO 0%~35%以下、及び/又は
B2O3 0%~30%以下、及び/又は
SiO2 0%~20%以下、
を含む(1)から(3)のいずれかの光学ガラス。
(RはMg,Ca,Sr,Ba,Znから選ばれる1種以上。)
(RはMg,Ca,Sr,Ba,Znから選ばれる1種以上。)
Al2O3 0~10%及び/又は
TiO2 0~10及び/又は
Nb2O5 0~10%及び/又は
WO3 0~10%及び/又は
Ta2O5 0~10%及び/又は
ZrO2 0~10%及び/又は
ZnO 0~20%及び/又は
MgO 0~20%及び/又は
CaO 0~20%及び/又は
SrO 0~20%及び/又は
BaO 0~20%及び/又は
Li2O 0~25%及び/又は
Na2O 0~25%及び/又は
K2O 0~25%及び/又は
Rb2O 0~25%及び/又は
Cs2O 0~25%及び/又は
Y2O3 0~10%及び/又は
La2O3 0~10%及び/又は
Gd2O3 0~10%及び/又は
Yb2O3 0~10%
を含む(1)から(7)いずれかの光学ガラス。
本発明の光学ガラスを構成する各成分の組成を以下に述べる。各成分の含有量は酸化物基準の質量%にて表現する。ここで「酸化物基準」とは、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、金属フッ化物等が溶融時にすべて分解され酸化物へ変化すると仮定した場合に、当該生成酸化物の質量の総和を100質量%として、ガラス中に含有される各成分含有量を表記したものである。また、上記酸化物の一部又は全部をフッ化物置換したFの合計量とは、本発明のガラス組成物中に存在しうるフッ素の含有率を、前記酸化物基準組成100%を基準にして、F原子として計算した場合の質量%で表したものである。
Bi2O3成分は部分分散比[θg,F]を大きくし、低分散化に効果があり、さらには低Tg化、耐水性の向上等、本発明のガラスに欠かすことができない成分である。しかしながら、その含有量が多すぎるとガラス安定性を欠如させやすく、少なすぎると、前記効果が得にくくなる。したがって、Bi2O3成分の含有量は、好ましくは45%、より好ましくは55%、最も好ましくは64%が下限であり、好ましくは95%、より好ましくは90%、最も好ましくは85%が上限である。
本発明のガラスは、その特性を損なわない範囲で、必要に応じ他の成分を含有することができる。ただし、Tiを除くV,Cr,Mn,Fe,Co,Ni,Cu,Ag及びMo等の各遷移金属成分は、それぞれを単独で又は組み合わせて少量含有される場合においても、ガラスを着色させ、可視域の特定の波長における吸収を生じさせる。したがって、可視領域の波長を利用する光学ガラスは、上記成分を実質的に含まないことが好ましい。ここで「実質的に含まない」とは、不純物として混入される場合を除き、人為的に添加されていないことを意味する。
Bi2O3 20%以上、
SiO2 0~15%以下、
B2O3 0~30%以下、並びに
Al2O3 0~15%及び/又は
TiO2 0~15及び/又は
Nb2O5 0~15%及び/又は
WO3 0~15%及び/又は
Ta2O5 0~15%及び/又は
ZrO2 0~15%及び/又は
ZnO 0~15%及び/又は
MgO 0~15%及び/又は
CaO 0~15%及び/又は
SrO 0~15%及び/又は
BaO 0~20%及び/又は
Li2O 0~25%及び/又は
Na2O 0~25%及び/又は
K2O 0~25%及び/又は
Rb2O 0~25%及び/又は
Cs2O 0~25%及び/又は
Y2O3 0~15%及び/又は
La2O3 0~15%及び/又は
Gd2O3 0~15%及び/又は
Yb2O3 0~15%及び/又は
P2O5 0~15%及び/又は
Sb2O3 0~3%及び/又は
GeO2 0~20%及び/又は
CeO2 0~10%及び/又は
TeO2 0~10%及び/又は
F 0~10%及び/又は
Claims (13)
- 酸化物基準の質量%でBi2O3成分を45%以上含有し、
部分分散比[θg,F]が0.63以上、アッベ数が27以下である光学ガラス。 - 酸化物基準の質量%でBi2O3成分、BaO成分、ZnO成分、B2O3成分、SiO2成分、Sb2O3成分の含有量の総和が96%未満である請求項1に記載の光学ガラス。
- 酸化物基準の質量%で、Bi2O3成分に対するB2O3成分の比が、0.20未満である請求項1又は2に記載の光学ガラス。
- 酸化物基準の質量%で
Bi2O3 64%以上、及び/又は
RO 0%~35%以下、及び/又は
B2O3 0%~30%以下、及び/又は
SiO2 0%~20%以下、
を含む請求項1から3いずれかに記載の光学ガラス。
(RはMg,Ca,Sr,Ba,Znから選ばれる1種以上。) - 酸化物基準の質量%で、Bi2O3成分に対するRO成分の比が0.292未満である請求項1から4いずれかに記載の光学ガラス。
(RはMg,Ca,Sr,Ba,Znから選ばれる1種以上。) - 酸化物基準の質量%で、B2O3成分に対するRO成分の比が1.01未満である請求項1から5いずれかに記載の光学ガラス。
- 酸化物基準の質量%で、希土類酸化物成分の含有量が3%以下である請求項1から6いずれかに記載の光学ガラス。
- 酸化物基準の質量%で、
Al2O3 0~10%及び/又は
TiO2 0~10及び/又は
Nb2O5 0~10%及び/又は
WO3 0~10%及び/又は
Ta2O5 0~10%及び/又は
ZrO2 0~10%及び/又は
ZnO 0~20%及び/又は
MgO 0~20%及び/又は
CaO 0~20%及び/又は
SrO 0~20%及び/又は
BaO 0~20%及び/又は
Li2O 0~25%及び/又は
Na2O 0~25%及び/又は
K2O 0~25%及び/又は
Rb2O 0~25%及び/又は
Cs2O 0~25%及び/又は
Y2O3 0~10%及び/又は
La2O3 0~10%及び/又は
Gd2O3 0~10%及び/又は
Yb2O3 0~10%
を含む請求項1から7いずれかに記載の光学ガラス。 - 液相温度が850℃以下である請求項1から8いずれかに記載の光学ガラス。
- B2O3成分を、酸化物基準の質量%で、0%を超えて含有する請求項1から9いずれかに記載の光学ガラス。
- 請求項1から10いずれかに記載の光学ガラスからなる研磨加工用プリフォーム及び/又は精密プレス成形用プリフォーム。
- 請求項11に記載の研磨加工用プリフォームを研磨してなる光学素子。
- 請求項11に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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