WO2014034622A1 - Optical glass, preform, and optical element - Google Patents
Optical glass, preform, and optical element Download PDFInfo
- Publication number
- WO2014034622A1 WO2014034622A1 PCT/JP2013/072778 JP2013072778W WO2014034622A1 WO 2014034622 A1 WO2014034622 A1 WO 2014034622A1 JP 2013072778 W JP2013072778 W JP 2013072778W WO 2014034622 A1 WO2014034622 A1 WO 2014034622A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component
- glass
- optical glass
- less
- optical
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- 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
-
- 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
-
- 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
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
Definitions
- the present invention relates to an optical glass, a preform, and an optical element.
- Optical systems such as digital cameras and video cameras, although large and small, contain blurs called aberrations. This aberration is classified into monochromatic aberration and chromatic aberration. In particular, the chromatic aberration is strongly dependent on the material characteristics of the lens used in the optical system.
- chromatic aberration is corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but this combination can only correct aberrations in the red region and the green region, and remains in the blue region.
- This blue region aberration that cannot be removed is called a secondary spectrum.
- the partial dispersion ratio ( ⁇ g, F) is used as an index of the optical characteristics to be noticed in the optical design.
- an optical material having a large partial dispersion ratio ( ⁇ g, F) is used for the low dispersion side lens, and the partial dispersion ratio ( By using an optical material having a small ⁇ g, F), the secondary spectrum is corrected well.
- the partial dispersion ratio ( ⁇ g, F) is expressed by the following equation (1).
- ⁇ g, F (n g ⁇ n F ) / (n F ⁇ n C ) (1)
- optical glass there is an approximately linear relationship between a partial dispersion ratio ( ⁇ g, F) representing partial dispersion in a short wavelength region and an Abbe number ( ⁇ d ).
- the straight line representing this relationship plots the partial dispersion ratio and Abbe number of NSL7 and PBM2 on the Cartesian coordinates employing 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 two points and is called a normal line (see FIG. 1).
- Normal glass which is the standard for normal lines, differs depending on the optical glass manufacturer, but each company defines it with almost the same slope and intercept.
- NSL7 and PBM2 are optical glasses manufactured by OHARA, Inc., and the Abbe number ( ⁇ d ) of PBM2 is 36.3, the partial dispersion ratio ( ⁇ g, F) is 0.5828, and the Abbe number ( ⁇ d ) of NSL7. Is 60.5, and the partial dispersion ratio ( ⁇ g, F) is 0.5436.
- optical glasses as shown in Patent Documents 1 to 3 are known.
- the glasses disclosed in Patent Documents 1 to 3 have a small partial dispersion ratio and are not sufficient for use as a lens for correcting the secondary spectrum. Further, the glasses disclosed in Patent Documents 1 to 3 are not highly transparent with respect to visible light, and are not sufficient for use in transmitting visible light. That is, there is a demand for an optical glass having a small Abbe number ( ⁇ d ), high dispersion, a small partial dispersion ratio ( ⁇ g, F), and high transparency to visible light.
- ⁇ d Abbe number
- ⁇ g, F small partial dispersion ratio
- the present invention has been made in view of the above problems, and the object of the present invention is to have a small Abbe number ( ⁇ d ) and a partial dispersion while the refractive index (n d ) is within a desired range.
- the object is to obtain an optical glass having a small ratio ( ⁇ g, F) and enhanced transparency to visible light, and a preform and an optical element using the optical glass.
- the present inventors have used SiO 2 component, CaO component and Nb 2 O 5 component together, and by setting these contents within a predetermined range.
- the inventors have also found that the coloring of the glass is reduced and the devitrification of the glass is reduced while obtaining a high refractive index, a low Abbe number, and a low partial dispersion ratio, and the present invention has been completed.
- the present invention provides the following.
- the SiO 2 component is 5.0% to 40.0%
- the CaO component is 5.0% to 40.0%
- the Nb 2 O 5 component is 15.0% to 50.
- the partial dispersion ratio ( ⁇ g, F) is between the Abbe number ( ⁇ d) and ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.00275 ⁇ ⁇ d + 0.68125) and satisfies the relationship ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.00162 ⁇ ⁇ d + 0.64622) in the range of ⁇ d> 31.
- Optical glass is between the Abbe number ( ⁇ d) and ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.002162 ⁇ ⁇ d + 0.64622) in the range of ⁇ d> 31.
- Mass sum (Nb 2 O 5 + ZrO 2 ) is 20.0% or more (1) to (3) any description of the optical glass.
- the mass sum of the RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, Zn) is 10.0% or more and 60.0% or less (1) To (10).
- the mass sum of the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is 20.0% or less, from (1) to (14) Any one of the optical glasses.
- the refractive index (n d ) is within a desired range
- the Abbe number ( ⁇ d ) is small
- the partial dispersion ratio ( ⁇ g, F) is small
- the transparency to visible light is enhanced.
- Optical glass, and a preform and an optical element using the optical glass can be obtained.
- the optical glass of the present invention is 5.0% by mass and the SiO 2 component is 5.0% or more and 40.0% or less, the CaO component is 5.0% or more and 40.0% or less, and the Nb 2 O 5 component is 15.0% by mass. % To 50.0% and a partial dispersion ratio ( ⁇ g, F) within the range of ⁇ d ⁇ 31 between the Abbe number ( ⁇ d) and ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F ) ⁇ ( ⁇ 0.00275 ⁇ ⁇ d + 0.68125), and in the range of ⁇ d> 31, ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.00162 ⁇ ⁇ d + 0.64622) Satisfy the relationship.
- ⁇ g, F partial dispersion ratio
- the SiO 2 component, the CaO component, and the Nb 2 O 5 component together, and setting these contents within a predetermined range, a low Abbe number and partial dispersion ratio can be obtained while obtaining a high refractive index, and Glass devitrification is reduced.
- the Abbe number ( ⁇ d ) can be reduced and the coloring of the glass can be reduced.
- the content of the Nb 2 O 5 component within a predetermined range, devitrification of the glass is reduced while a low Abbe number and a low partial dispersion ratio are obtained.
- the composition range of each component constituting the optical glass of the present invention is described below. Unless otherwise specified in the present specification, the contents of the respective components are all expressed in mass% with respect to the total mass of the glass in terms of oxide.
- the “oxide equivalent 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 mass of the said production
- the SiO 2 component is an essential component that promotes stable glass formation and reduces devitrification (generation of crystalline substances), which is not desirable as an optical glass.
- the content of the SiO 2 component is 5.0% or more, a glass having excellent devitrification resistance can be obtained without significantly increasing the partial dispersion ratio of the glass. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the SiO 2 component is preferably 5.0%, more preferably 9.0%, and still more preferably 14.0%.
- the content of SiO 2 component 40.0% or less it is possible to easily obtain a desired high refractive index by making it difficult for the refractive index of the glass to decrease, and partial dispersion of the glass An increase in the ratio can be suppressed. Moreover, the meltability of the glass can be kept good. Accordingly, the upper limit of the content of the SiO 2 component is preferably 40.0%, more preferably 30.0%, and even more preferably 25.0%.
- SiO 2 component SiO 2 , K 2 SiF 6 , Na 2 SiF 6 or the like can be used as a raw material.
- the CaO component is an essential component necessary for obtaining a glass having a low Abbe number and high devitrification resistance.
- the content of the CaO component is 5.0% or more, an optical glass having a low Abbe number and high devitrification resistance can be obtained, and the solubility of the glass can be increased. Therefore, the content of the CaO component is preferably 5.0%, more preferably 7.0%, still more preferably 9.0%, still more preferably 11.0%, and further preferably 15.0%. To do.
- the upper limit of the CaO component content is preferably 40.0%, more preferably 35.0%, still more preferably 30.0%, and even more preferably 27.0%.
- CaO component CaCO 3 , CaF 2 or the like can be used as a raw material.
- the Nb 2 O 5 component is an essential component that can increase the devitrification resistance of the glass, increase the refractive index of the glass, and lower the Abbe number and partial dispersion ratio. Moreover, this can improve the press formability of the glass. Therefore, the content of the Nb 2 O 5 component is preferably 15.0%, more preferably 20.0%, and still more preferably 25.0%. On the other hand, by making the content of the Nb 2 O 5 component 50.0% or less, an increase in the melting temperature during glass production can be suppressed, and devitrification due to excessive content of the Nb 2 O 5 component can be reduced. .
- the content of the Nb 2 O 5 component is preferably 50.0%, more preferably 45.0%, still more preferably 40.0%, and further preferably 37.0%.
- Nb 2 O 5 component Nb 2 O 5 or the like can be used as a raw material.
- the ZrO 2 component is an optional component that can contain more than 0% to increase the refractive index and Abbe number of the glass, lower the partial dispersion ratio, and increase the devitrification resistance. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the ZrO 2 component is preferably more than 0%, more preferably 1.0%, and still more preferably 3.0%. On the other hand, by setting the content of the ZrO 2 component to 15.0% or less, devitrification of the glass can be reduced, and more uniform glass can be easily obtained. Therefore, the content of the ZrO 2 component is preferably 15.0%, more preferably 12.0%, and still more preferably 10.0%. As the ZrO 2 component, ZrO 2 , ZrF 4 or the like can be used as a raw material.
- the sum (mass sum) of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 20.0% or more. Thereby, the refractive index can be increased, the Abbe number can be lowered, and the partial dispersion ratio can be lowered. Therefore, the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 20.0%, more preferably 25.0%, and even more preferably 30.0%. On the other hand, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) may be 55.0% or less. Thereby, the glass with higher devitrification resistance and stability can be obtained. Accordingly, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 55.0%, more preferably 50.0%, and still more preferably 45.0%.
- the content of the TiO 2 component is preferably more than 0%, more preferably more than 0.5%, still more preferably 1.0%, and still more preferably 1.2%.
- the content of the TiO 2 component is 20.0% or less, the coloring of the glass can be reduced, and the internal transmittance of the glass can be increased. In addition, this makes it difficult to increase the partial dispersion ratio, so that a desired low partial dispersion ratio close to the normal line can be easily obtained.
- the content of the TiO 2 component is preferably 20.0%, more preferably 15.0%, even more preferably 11.0%, still more preferably 9.0%, still more preferably 7.0%, Preferably, the upper limit is 5.0%.
- TiO 2 component TiO 2 or the like can be used as a raw material.
- the ratio (mass ratio) of the content of the TiO 2 component to the content of the Nb 2 O 5 component is preferably 0.50 or less.
- the partial dispersion ratio is lowered while the refractive index and Abbe number of the glass are adjusted within a desired range, so that an optical glass having a relationship between the desired Abbe number and the partial dispersion ratio can be obtained.
- an optical glass with little coloring can be obtained.
- the mass ratio TiO 2 / Nb 2 O 5 is preferably 0.50, more preferably 0.40, still more preferably 0.33, still more preferably 0.25, still more preferably 0.20, and even more preferably.
- the upper limit is 0.172.
- the lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
- the ratio (mass ratio) of the TiO 2 component to the sum of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 0.50 or less.
- the mass ratio TiO 2 / (Nb 2 O 5 + ZrO 2 ) is preferably 0.50, more preferably 0.25, still more preferably 0.20, and even more preferably less than 0.14.
- the lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
- the BaO component is an optional component that can increase the refractive index of the glass, reduce the partial dispersion ratio of the glass, and increase the devitrification resistance and solubility of the glass by containing more than 0%. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the BaO component is preferably more than 0%, more preferably 1.0%, and even more preferably 4.0%. On the other hand, by setting the content of the BaO component to 30.0% or less, deterioration of devitrification resistance and chemical durability due to excessive inclusion of the BaO component can be suppressed.
- the upper limit of the content of the BaO component is preferably 30.0%, more preferably 25.0%, and even more preferably 20.0%.
- BaO component BaCO 3 , Ba (NO 3 ) 2 or the like can be used as a raw material.
- the ratio (mass ratio) of the BaO component content to the CaO component content is preferably greater than 0.15.
- the mass ratio (BaO / CaO) is preferably more than 0.15, more preferably more than 0.20, and even more preferably more than 0.25.
- the upper limit of this ratio is not particularly limited, but is preferably 2.00, more specifically 1.50, and even more specifically 1.20.
- the MgO component is an optional component that can lower the melting temperature of the glass by containing more than 0%.
- the content of the MgO component is preferably 20.0%, more preferably 10.0%, and further preferably 5.0%.
- MgO component MgO, MgCO 3 , MgF 2 or the like can be used as a raw material.
- the SrO component is an optional component that can increase the refractive index of the glass and increase the devitrification resistance.
- the deterioration of the chemical durability of the glass can be suppressed by setting the content of the SrO component to 25.0% or less. Therefore, the SrO component content is preferably 25.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 4.0%.
- SrO component Sr (NO 3 ) 2 , SrF 2 or the like can be used as a raw material.
- the ZnO component is an optional component that increases the devitrification resistance of the glass and lowers the glass transition point by containing more than 0%.
- the content of the ZnO component is 15.0% or less, the chemical durability of the glass can be enhanced while reducing devitrification and coloring during reheating of the glass. Therefore, the upper limit of the content of the ZnO component is preferably 15.0%, more preferably less than 8.0%, still more preferably 5.0%, and still more preferably 3.5%.
- ZnO component ZnO, ZnF 2 or the like can be used as a raw material.
- the total content (mass sum) of RO components is 10.0% or more and 60.0% or less. preferable.
- the devitrification resistance of the glass can be increased by containing 10.0% or more of the RO component. Therefore, the total content of RO components is preferably 10.0%, more preferably 17.0%, more preferably 25.0%, and still more preferably 30.0%.
- the total content of RO components is preferably 60.0%, more preferably 50.0%, and still more preferably 40.0%.
- the ratio (mass ratio) of the ZnO component to the total content of MgO component, CaO component, SrO component and BaO component is preferably 0.20 or less.
- the mass ratio ZnO / (MgO + CaO + SrO + BaO) is preferably 0.20, more preferably 0.10, and still more preferably 0.07.
- the B 2 O 3 component is an optional component that can enhance the devitrification resistance and promote the glass solubility by promoting stable glass formation. Therefore, the content of the B 2 O 3 component is preferably more than 0%, more preferably 0.5%, even more preferably 1.0%, and even more preferably 1.3%. It may be. On the other hand, by setting the content of the B 2 O 3 component to 30.0% or less, a decrease in the refractive index can be suppressed and an increase in the partial dispersion ratio of the glass can be suppressed. Moreover, devitrification at the time of reheating of glass can be reduced thereby.
- the content of the B 2 O 3 component is preferably 30.0%, more preferably 20.0% as an upper limit, further preferably less than 13.0%, still more preferably 10.0%, still more preferably The upper limit is 7.0%.
- the B 2 O 3 component H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 .10H 2 O, BPO 4 or the like can be used as a raw material.
- Li 2 O component, Na 2 O component, and K 2 O component are optional components that can lower the partial dispersion ratio of the glass, increase the meltability of the glass, and lower the glass transition point by containing more than 0%. It is.
- the content of the Li 2 O component 15.0% or less while suppressing the decrease in the refractive index, the whitening at the time of glass formation and reheating due to excessive inclusion of the Li 2 O component, The chemical durability of the glass can be enhanced while reducing crystal precipitation.
- the content of Na 2 O component below 15.0% while less likely to lower the refractive index, it is difficult to deteriorate chemical durability.
- the content of each of the Li 2 O component, Na 2 O component and K 2 O component is preferably 15.0%, more preferably 10.0%, still more preferably 7.0%, and even more preferably 5%. 0.0% is the upper limit.
- Li 2 O component, Na 2 O component, and K 2 O component are Li 2 CO 3 , LiNO 3 , LiF, Na 2 CO 3 , NaNO 3 , NaF, Na 2 SiF 6 , K 2 CO 3 , KNO 3 as raw materials. , KF, KHF 2 , K 2 SiF 6 or the like can be used.
- Cs 2 O component by ultra containing 0%, which is an optional component that can be lowered glass transition temperature.
- the content of the Cs 2 O component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
- Cs 2 O component Cs 2 CO 3 , CsNO 3 or the like can be used as a raw material.
- the total amount of Rn 2 O components (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is preferably 20.0% or less. Thereby, it is difficult to lower the refractive index of the glass, and devitrification at the time of glass formation can be reduced. Therefore, the upper limit of the mass sum of the content of the Rn 2 O component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
- Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are optional components that can reduce the partial dispersion ratio while increasing the refractive index of glass by containing more than 0%. is there.
- devitrification of the glass is reduced by making each content of the Y 2 O 3 component, the La 2 O 3 component, the Gd 2 O 3 component, and the Yb 2 O 3 component 20.0% or less, An increase in the Abbe number of the glass can be suppressed and the material cost of the glass can be reduced.
- La 2 O 3 component the content of each of Gd 2 O 3 component and Yb 2 O 3 component to 15.0% can be reduced the specific gravity of glass.
- the content of each of the Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component is preferably 20.0%, and more preferably less than 15.0%. More preferably, the upper limit is 12.0%, more preferably 10.0%.
- Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are Y 2 O 3 , YF 3 , La 2 O 3 , La (NO 3 ) 3 .XH 2 O as raw materials. (X is an arbitrary integer), Gd 2 O 3 , GdF 3 , Yb 2 O 3 and the like can be used.
- the ratio (mass ratio) of the content of the La 2 O 3 component to the total content of the BaO component and the CaO component is preferably 0.65 or less. Thereby, it is possible to reduce the specific gravity of the glass and reduce the material cost while obtaining a desired low partial dispersion ratio. Therefore, the mass ratio La 2 O 3 / (BaO + CaO) is preferably 0.65, more preferably 0.50, and still more preferably 0.40.
- P 2 O 5 component is an optional component that enhances the stability of the glass by ultrasonic containing 0%.
- the content of the P 2 O 5 component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
- Al (PO 3 ) 3 , Ca (PO 3 ) 2 , Ba (PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like can be used as a raw material.
- the GeO 2 component is an optional component that can contain more than 0% to increase the refractive index of the glass, stabilize the glass, and reduce devitrification during molding.
- the content of GeO 2 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
- GeO 2 component GeO 2 or the like can be used as a raw material.
- the Al 2 O 3 component is an optional component that can increase the chemical durability of the glass and improve the devitrification resistance of the glass by containing more than 0%.
- the content of the Al 2 O 3 component below 30.0% can be reduced devitrification due to excessive content of Al 2 O 3 component.
- the upper limit of the content of the Al 2 O 3 component is preferably 30.0%, more preferably 20.0%, and even more preferably 10.0%.
- Al 2 O 3 component Al 2 O 3 , Al (OH) 3 , AlF 3 or the like can be used as a raw material.
- the WO 3 component is an optional component that increases the refractive index of the glass, lowers the Abbe number, increases the devitrification resistance of the glass, and increases the solubility of the glass.
- the upper limit of the content of the WO 3 component is preferably 20.0%, more preferably 10.0%, and even more preferably 7.0%.
- WO 3 component WO 3 or the like can be used as a raw material.
- the Ta 2 O 5 component is an optional component that increases the refractive index of the glass, lowers the Abbe number and partial dispersion ratio of the glass, and increases the devitrification resistance of the glass by containing more than 0%.
- the content of Ta 2 O 5 component 15.0% or less, the amount of Ta 2 O 5 component, which is a rare mineral resource, is reduced, and the glass is easily melted at a lower temperature. Glass production costs can be reduced. Moreover, this can reduce the devitrification of the glass due to excessive inclusion of the Ta 2 O 5 component. Therefore, the content of the Ta 2 O 5 component is preferably 15.0%, more preferably 10.0%, and still more preferably 5.0%.
- Ta 2 O 5 component Ta 2 O 5 or the like can be used as a raw material.
- the Bi 2 O 3 component is an optional component that can contain more than 0% to increase the refractive index of the glass, lower the Abbe number, and lower the glass transition point.
- the content of the Bi 2 O 3 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
- Bi 2 O 3 component Bi 2 O 3 or the like can be used as a raw material.
- the TeO 2 component is an optional component that can increase the refractive index of the glass, lower the partial dispersion ratio of the glass, and lower the glass transition point by containing more than 0%.
- the content of the TeO 2 component is preferably 30.0%, more preferably 20.0%, and still more preferably 10.0%.
- TeO 2 component can use TeO 2 or the like as a raw material.
- the Sb 2 O 3 component is an optional component capable of promoting the defoaming of the glass and clarifying the glass by containing more than 0%.
- the content of the Sb 2 O 3 component is preferably 3.0%, more preferably 2.0%, still more preferably 1.0%, and still more preferably 0.5%.
- the Sb 2 O 3 component does not have to be contained when the environmental impact of the optical glass is emphasized.
- Sb 2 O 3 component Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 .5H 2 O, or the like can be used as a raw material.
- components of the fining defoaming of glass is not limited to the above Sb 2 O 3 ingredients may be used known refining agents and defoamers in the field of glass production, or a combination thereof .
- each transition metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, excluding Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, is independent of each other. Or, even when it is contained in a small amount in combination, the glass is colored and has the property of causing absorption at a specific wavelength in the visible range. .
- lead compounds such as PbO and arsenic compounds such as As 2 O 3 are components with high environmental loads, it is desirable that they are not substantially contained, that is, not contained at all except for inevitable mixing.
- each component of Th, Cd, Tl, Os, Be, and Se has tended to be refrained from being used as a harmful chemical material in recent years, and not only in the glass manufacturing process, but also in the processing process and disposal after commercialization. Until then, environmental measures are required. Therefore, when importance is placed on the environmental impact, it is preferable that these are not substantially contained.
- the glass composition of the present invention cannot be expressed directly in the description of mol% because the composition is expressed by mass% with respect to the total mass of the glass of oxide conversion composition, but various properties required in the present invention.
- the composition expressed by mol% of each component present in the glass composition satisfying the above conditions generally takes the following values in terms of oxide conversion.
- 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 platinum crucible, a quartz crucible or an alumina crucible and roughly melted, then a gold crucible, a platinum crucible In a platinum alloy crucible or iridium crucible, melt in a temperature range of 1100 to 1400 ° C. for 3 to 5 hours, stir and homogenize to blow out bubbles, etc., then lower the temperature to 1000 to 1400 ° C. and then finish stirring This is done by removing the striae, casting into a mold and slow cooling.
- the optical glass of the present invention preferably has a predetermined refractive index and dispersion (Abbe number). More specifically, the refractive index (n d ) of the optical glass of the present invention is preferably 1.70, more preferably 1.74, still more preferably 1.78, and still more preferably 1.82. . On the other hand, the upper limit of the refractive index (n d ) of the optical glass of the present invention is not particularly limited, but is preferably 2.20, more preferably 2.10, still more preferably 2.00, and still more preferably 1.90. May be. Moreover, the Abbe number ( ⁇ d ) of the optical glass of the present invention is preferably 35, more preferably 34, and still more preferably 33.
- Abbe number ( ⁇ d ) of the optical glass of the present invention is preferably 35, more preferably 34, and still more preferably 33.
- the lower limit of the Abbe number ( ⁇ d ) of the optical glass of the present invention is not particularly limited, but may be preferably 25, more preferably 26, and even more preferably 27. As a result, the degree of freedom in optical design is increased, and a large amount of light refraction can be obtained even if the device is made thinner.
- the optical glass of the present invention has a low partial dispersion ratio ( ⁇ g, F). More specifically, the partial dispersion ratio ( ⁇ g, F) of the optical glass of the present invention is within the range of ⁇ d ⁇ 31 with respect to the Abbe number ( ⁇ d ) ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822). ⁇ ( ⁇ g, F) ⁇ ( ⁇ 0.00275 ⁇ ⁇ d + 0.68125) is satisfied, and ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) ⁇ ( ⁇ g, F) ⁇ ( ⁇ in the range of ⁇ d > 31 0.00162 ⁇ ⁇ d + 0.64622).
- the lower limit of the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d ⁇ 31 is preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822), more preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.63922), More preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.64022).
- the upper limit of the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d ⁇ 31 is preferably ( ⁇ 0.00275 ⁇ ⁇ d + 0.68125), more preferably ( ⁇ 0.00275 ⁇ ⁇ d + 0.68025), More preferably ( ⁇ 0.00275 ⁇ ⁇ d + 0.67925).
- the lower limit of the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d > 31 is preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822), more preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.63922), Preferably, it is ( ⁇ 0.00162 ⁇ ⁇ d + 0.64022).
- the upper limit of the partial dispersion ratio ( ⁇ g, F) of the optical glass at ⁇ d > 31 is preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.64622), more preferably ( ⁇ 0.00162 ⁇ ⁇ d + 0.64522). More preferably, it is ( ⁇ 0.00162 ⁇ ⁇ d + 0.64422).
- the partial dispersion ratio ( ⁇ g, F) of general glass is higher than that of the normal line, and the partial dispersion ratio ( ⁇ g, F) of general glass is high.
- the Abbe number ( ⁇ d ) are represented by curves.
- the optical glass of this invention has little coloring.
- the wavelength ( ⁇ 70 ) showing a spectral transmittance of 70% in a sample having a thickness of 10 mm is preferably 450 nm or less, more preferably 430 nm or less, More preferably, it is 410 nm or less.
- a wavelength ( ⁇ 5 ) showing a spectral transmittance of 5% in a sample having a thickness of 10 mm is preferably 400 nm or less, more preferably 380 nm or less, and further preferably 360 nm or less.
- this optical glass can be preferably used as a material for an optical element such as a lens.
- the optical glass of the present invention preferably has good press formability. That is, the optical glass of the present invention divides the transmittance of light (d-line) having a wavelength of 587.56 nm of the test piece after the reheating test (ii) by the transmittance of d-line of the test piece before the reheating test.
- the measured value is preferably 0.95 or more.
- a lambda 70 is a wavelength at which the transmittance of the reheating test (a) before the specimen is 70% and the difference between the lambda 70 of the test piece after the reheating test is 20nm or less.
- the value obtained by dividing the transmittance of the light beam (d-line) having a wavelength of 587.56 nm of the test piece after the reheating test (ii) by the transmittance of the d-line of the test piece before the reheating test (ii) is The lower limit is preferably 0.95, more preferably 0.96, and still more preferably 0.97.
- the difference between the lambda 70 of the test piece after the reheating test and lambda 70 of reheating test (a) prior to the test piece (b) is preferably 20 nm, more preferably 18 nm, more preferably the upper limit of the 16nm To do.
- reheating test (A) a test piece 15 mm ⁇ 15 mm ⁇ 30 mm is reheated, and the temperature is raised from room temperature to a temperature 80 ° C. higher than the transition temperature (Tg) of each sample in 150 minutes.
- the temperature can be kept at 30 ° C. higher than the transition temperature (Tg) for 30 minutes, then naturally cooled to room temperature, and the two opposing surfaces of the test piece are polished to a thickness of 10 mm and visually observed.
- a glass molded body can be produced from the produced optical glass by means of mold press molding such as reheat press molding or precision press molding. That is, a preform for mold press molding is prepared from optical glass, and after performing reheat press molding on the preform, polishing is performed to prepare a glass molded body, or for example, polishing is performed.
- the preform can be precision press-molded to produce a glass molded body.
- the means for producing the glass molded body is not limited to these means.
- the glass molded body produced in this way is useful for various optical elements, and among them, it is particularly preferable to use for optical elements such as lenses and prisms.
- optical elements such as lenses and prisms.
- color bleeding due to chromatic aberration in the transmitted light of the optical system provided with the optical element is reduced. Therefore, when this optical element is used in a camera, a photographing object can be expressed more accurately, and when this optical element is used in a projector, a desired image can be projected with higher definition.
- the glasses of the examples and comparative examples of the present invention are ordinary optical glasses such as oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, and metaphosphate compounds corresponding to the raw materials of the respective components. After selecting the high-purity raw materials to be used in the above, weighing them so as to have the composition ratios of the examples and comparative examples shown in the table, mixing them uniformly, and then putting them into a platinum crucible, making it easy to melt the glass composition Depending on the temperature, melt in a temperature range of 1100 to 1400 ° C for 3 to 5 hours in an electric furnace, stir and homogenize to remove bubbles, then lower the temperature to 1000 to 1400 ° C and stir and homogenize the mold The glass was produced by casting and slowly cooling.
- permeability of the glass of an Example and a 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 face parallel polished product having a thickness of 10 ⁇ 0.1 mm was measured for a spectral transmittance of 200 to 800 nm in accordance with JISZ8722, and ⁇ 5 (wavelength when the transmittance was 5%) and ⁇ 70 (transmittance). Wavelength at 70%).
- the optical glass of the example of the present invention has a partial dispersion ratio ( ⁇ g, F) of ( ⁇ 0.00275 ⁇ ⁇ d + 0.68125) or less when ⁇ d ⁇ 31, more specifically ( ⁇ 0.00275 ⁇ ⁇ d + 0. 67850) or less.
- the partial dispersion ratio ( ⁇ g, F) was ( ⁇ 0.00162 ⁇ ⁇ d + 0.64622) or less, more specifically, ( ⁇ 0.00162 ⁇ ⁇ d + 0.64302) or less.
- the optical glass of the example of the present invention has a partial dispersion ratio ( ⁇ g, F) of ( ⁇ 0.00162 ⁇ ⁇ d + 0.63822) or more, more specifically ( ⁇ 0.00162 ⁇ ⁇ d + 0.63972) or more.
- ⁇ g, F partial dispersion ratio
- Met the relationship between the partial dispersion ratio ( ⁇ g, F) and the Abbe number ( ⁇ d ) for the glass of the example of the present application is as shown in FIG. Therefore, it was found that these partial dispersion ratios ( ⁇ g, F) are within a desired range.
- the glasses of the comparative examples No. A to No.
- the optical glass of the example of the present invention has a smaller partial dispersion ratio ( ⁇ g, F) in the relational expression with the Abbe number ( ⁇ d ) than the glass of the comparative example.
- the optical glasses of the examples of the present invention all have a refractive index (n d ) of 1.70 or more, more specifically 1.82 or more, and this refractive index (n d ) of 2.20 or less. More specifically, it was 1.87 or less, which was within the desired range.
- the optical glasses of the examples of the present invention all have an Abbe number ( ⁇ d ) of 25 or more, more specifically 30 or more, and this Abbe number ( ⁇ d ) of 35 or less, more specifically 33. And within the desired range.
- the glass of the comparative example of the present invention (No. A) are, [nu d was more than 34. Therefore, it was revealed that the optical glass of the example of the present invention has a smaller Abbe number ( ⁇ d ) than the glass of the comparative example (No. A).
- ⁇ 70 (wavelength at 70% transmittance) was 450 nm or less, more specifically 410 nm or less.
- each of ⁇ 5 (wavelength at 5% transmittance) was 400 nm or less, more specifically, 357 nm or less.
- the optical glass of the example of the present invention has a high transmittance for visible light and a small chromatic aberration, while the refractive index (n d ) and the Abbe number ( ⁇ d ) are within the desired ranges. became.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Provided is an optical glass having a small Abbe number (νd), a small partial dispersion ratio (θg, F), and heightened transparency with respect to visible light while the refractive index (nd) is within a desired range. Also provided is a preform and an optical element in which the optical glass is used. The optical glass contains 5.0 to 40.0% of a SiO2 component, 5.0 to 40.0% of a CaO component, and 15.0 to 50.0% of an Nb2O5 component (all figures representing percentage by mass). With respect to the Abbe number (νd), the partial dispersion ratio (θg, F) satisfies the relationship (-0.00162 × νd + 0.63822) ≤ (θg, F) ≤ (-0.00275 × νd + 0.68125) in the range where νd ≤ 31 and satisfies the relationship (-0.00162 × νd + 0.63822) ≤ (θg, F) ≤ (-0.00162 × νd + 0.64622) in the range where νd > 31.
Description
本発明は、光学ガラス、プリフォーム及び光学素子に関する。
The present invention relates to an optical glass, a preform, and an optical element.
デジタルカメラやビデオカメラ等の光学系は、その大小はあるが、収差と呼ばれるにじみを含んでいる。この収差は単色収差と色収差に分類されるが、特に色収差は、光学系に使用されるレンズの材料特性に強く依存している。
Optical systems such as digital cameras and video cameras, although large and small, contain blurs called aberrations. This aberration is classified into monochromatic aberration and chromatic aberration. In particular, the chromatic aberration is strongly dependent on the material characteristics of the lens used in the optical system.
一般に色収差は、低分散の凸レンズと高分散の凹レンズとを組み合わせて補正されるが、この組み合わせでは赤色領域と緑色領域の収差の補正しかできず、青色領域の収差が残る。この除去しきれない青色領域の収差を二次スペクトルと呼ぶ。二次スペクトルを補正するには、青色領域のg線(435.835nm)の動向を加味した光学設計を行う必要がある。このとき、光学設計で着目される光学特性の指標として、部分分散比(θg,F)が用いられている。上述の低分散のレンズと高分散のレンズとを組み合わせた光学系では、低分散側のレンズに部分分散比(θg,F)の大きい光学材料を用い、高分散側のレンズに部分分散比(θg,F)の小さい光学材料を用いることで、二次スペクトルが良好に補正される。
Generally, chromatic aberration is corrected by combining a low-dispersion convex lens and a high-dispersion concave lens, but this combination can only correct aberrations in the red region and the green region, and remains in the blue region. This blue region aberration that cannot be removed is called a secondary spectrum. In order to correct the secondary spectrum, it is necessary to perform an optical design in consideration of the trend of the g-line (435.835 nm) in the blue region. At this time, the partial dispersion ratio (θg, F) is used as an index of the optical characteristics to be noticed in the optical design. In the optical system combining the low dispersion lens and the high dispersion lens, an optical material having a large partial dispersion ratio (θg, F) is used for the low dispersion side lens, and the partial dispersion ratio ( By using an optical material having a small θg, F), the secondary spectrum is corrected well.
部分分散比(θg,F)は、下式(1)により示される。
θg,F=(ng-nF)/(nF-nC)・・・・・・(1) The partial dispersion ratio (θg, F) is expressed by the following equation (1).
θg, F = (n g −n F ) / (n F −n C ) (1)
θg,F=(ng-nF)/(nF-nC)・・・・・・(1) The partial dispersion ratio (θg, F) is expressed by the following equation (1).
θg, F = (n g −n F ) / (n F −n C ) (1)
光学ガラスには、短波長域の部分分散性を表す部分分散比(θg,F)とアッベ数(νd)との間に、およそ直線的な関係がある。この関係を表す直線は、部分分散比(θg,F)を縦軸に、アッベ数(νd)を横軸に採用した直交座標上で、NSL7とPBM2の部分分散比及びアッベ数をプロットした2点を結ぶ直線で表され、ノーマルラインと呼ばれている(図1参照)。ノーマルラインの基準となるノーマルガラスは光学ガラスメーカー毎によっても異なるが、各社ともほぼ同等の傾きと切片で定義している。(NSL7とPBM2は株式会社オハラ社製の光学ガラスであり、PBM2のアッベ数(νd)は36.3,部分分散比(θg,F)は0.5828、NSL7のアッベ数(νd)は60.5、部分分散比(θg,F)は0.5436である。)
In optical glass, there is an approximately linear relationship between a partial dispersion ratio (θg, F) representing partial dispersion in a short wavelength region and an Abbe number (ν d ). The straight line representing this relationship plots the partial dispersion ratio and Abbe number of NSL7 and PBM2 on the Cartesian coordinates employing the partial dispersion ratio (θg, F) on the vertical axis and the Abbe number (ν d ) on the horizontal axis. It is represented by a straight line connecting two points and is called a normal line (see FIG. 1). Normal glass, which is the standard for normal lines, differs depending on the optical glass manufacturer, but each company defines it with almost the same slope and intercept. (NSL7 and PBM2 are optical glasses manufactured by OHARA, Inc., and the Abbe number (ν d ) of PBM2 is 36.3, the partial dispersion ratio (θg, F) is 0.5828, and the Abbe number (ν d ) of NSL7. Is 60.5, and the partial dispersion ratio (θg, F) is 0.5436.)
ここで、高分散を有するガラスとしては、例えば特許文献1~3に示されるような光学ガラスが知られている。
Here, as glass having high dispersion, for example, optical glasses as shown in Patent Documents 1 to 3 are known.
しかし、特許文献1~3で開示されたガラスは、部分分散比が小さくなく、前記二次スペクトルを補正するレンズとして使用するには十分でなかった。また、特許文献1~3で開示されたガラスは、可視光に対する透明性が高くなく、特に可視光を透過する用途に用いるには十分でなかった。すなわち、アッベ数(νd)が小さく高分散であり、部分分散比(θg,F)が小さく、且つ可視光に対する透明性が高い光学ガラスが求められている。
However, the glasses disclosed in Patent Documents 1 to 3 have a small partial dispersion ratio and are not sufficient for use as a lens for correcting the secondary spectrum. Further, the glasses disclosed in Patent Documents 1 to 3 are not highly transparent with respect to visible light, and are not sufficient for use in transmitting visible light. That is, there is a demand for an optical glass having a small Abbe number (ν d ), high dispersion, a small partial dispersion ratio (θg, F), and high transparency to visible light.
本発明は、上記問題点に鑑みてなされたものであって、その目的とするところは、屈折率(nd)が所望の範囲内にありながら、アッベ数(νd)が小さく、部分分散比(θg,F)が小さく、且つ可視光に対する透明性が高められた光学ガラスと、これを用いたプリフォーム及び光学素子を得ることにある。
The present invention has been made in view of the above problems, and the object of the present invention is to have a small Abbe number (ν d ) and a partial dispersion while the refractive index (n d ) is within a desired range. The object is to obtain an optical glass having a small ratio (θg, F) and enhanced transparency to visible light, and a preform and an optical element using the optical glass.
本発明者らは、上記課題を解決するために鋭意試験研究を重ねた結果、SiO2成分、CaO成分及びNb2O5成分を併用し、これらの含有量を所定の範囲内にすることによって、高い屈折率や低いアッベ数、低い部分分散比が得られながらも、ガラスの着色が低減され、且つガラスの失透が低減されることをも見出し、本発明を完成するに至った。
具体的には、本発明は以下のようなものを提供する。 As a result of intensive studies and studies to solve the above-mentioned problems, the present inventors have used SiO 2 component, CaO component and Nb 2 O 5 component together, and by setting these contents within a predetermined range. The inventors have also found that the coloring of the glass is reduced and the devitrification of the glass is reduced while obtaining a high refractive index, a low Abbe number, and a low partial dispersion ratio, and the present invention has been completed.
Specifically, the present invention provides the following.
具体的には、本発明は以下のようなものを提供する。 As a result of intensive studies and studies to solve the above-mentioned problems, the present inventors have used SiO 2 component, CaO component and Nb 2 O 5 component together, and by setting these contents within a predetermined range. The inventors have also found that the coloring of the glass is reduced and the devitrification of the glass is reduced while obtaining a high refractive index, a low Abbe number, and a low partial dispersion ratio, and the present invention has been completed.
Specifically, the present invention provides the following.
(1) 質量%で、SiO2成分を5.0%以上40.0%以下、CaO成分を5.0%以上40.0%以下、及びNb2O5成分を15.0%以上50.0%以下含有し、部分分散比(θg,F)がアッベ数(νd)との間で、νd≦31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00275×νd+0.68125)の関係を満たし、νd>31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00162×νd+0.64622)の関係を満たす光学ガラス。
(1) By mass%, the SiO 2 component is 5.0% to 40.0%, the CaO component is 5.0% to 40.0%, and the Nb 2 O 5 component is 15.0% to 50. In the range of νd ≦ 31, the partial dispersion ratio (θg, F) is between the Abbe number (νd) and (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (− 0.00275 × νd + 0.68125) and satisfies the relationship (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (−0.00162 × νd + 0.64622) in the range of νd> 31. Optical glass.
(2) 質量%で、ZrO2成分を0%超含有する(1)記載の光学ガラス。
(2) The optical glass according to (1), which contains, by mass%, a ZrO 2 component exceeding 0%.
(3) 質量%で、ZrO2成分の含有量が15.0%以下である(1)又は(2)記載の光学ガラス。
(3) The optical glass according to (1) or (2), wherein the content of the ZrO 2 component is 15.0% by mass or less.
(4) 質量和(Nb2O5+ZrO2)が20.0%以上である(1)から(3)のいずれか記載の光学ガラス。
(4) Mass sum (Nb 2 O 5 + ZrO 2 ) is 20.0% or more (1) to (3) any description of the optical glass.
(5) 質量%で、TiO2成分の含有量が20.0%以下である(1)から(4)のいずれか記載の光学ガラス。
(5) The optical glass according to any one of (1) to (4), wherein the content of the TiO 2 component is 20.0% or less by mass%.
(6) 質量比TiO2/Nb2O5が0.50以下である(1)から(5)のいずれか記載の光学ガラス。
(6) mass ratio TiO 2 / Nb 2 O 5 is 0.50 or less (1) to (5) any description of the optical glass.
(7) 質量比TiO2/(Nb2O5+ZrO2)が0.50以下である(1)から(6)のいずれか記載の光学ガラス。
(7) The optical glass according to any one of (1) to (6), wherein the mass ratio TiO 2 / (Nb 2 O 5 + ZrO 2 ) is 0.50 or less.
(8) 質量%で、BaO成分を0%超30.0%以下含有する(1)から(7)のいずれか記載の光学ガラス。
(8) The optical glass according to any one of (1) to (7), containing, by mass%, a BaO component of more than 0% and 30.0% or less.
(9) 質量比BaO/CaOが0.15より大きい(1)から(8)のいずれか記載の光学ガラス。
(9) The optical glass according to any one of (1) to (8), wherein the mass ratio BaO / CaO is greater than 0.15.
(10) 質量%で
MgO成分 0~20.0%
SrO成分 0~25.0%
ZnO成分 0~15.0%
である(1)から(9)のいずれか記載の光学ガラス。 (10) MgO component by mass% 0-20.0%
SrO component 0-25.0%
ZnO component 0-15.0%
The optical glass according to any one of (1) to (9).
MgO成分 0~20.0%
SrO成分 0~25.0%
ZnO成分 0~15.0%
である(1)から(9)のいずれか記載の光学ガラス。 (10) MgO component by mass% 0-20.0%
SrO component 0-25.0%
ZnO component 0-15.0%
The optical glass according to any one of (1) to (9).
(11) RO成分(式中、RはMg、Ca、Sr、Ba、Znからなる群より選択される1種以上)の質量和が10.0%以上60.0%以下である(1)から(10)のいずれか記載の光学ガラス。
(11) The mass sum of the RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, Zn) is 10.0% or more and 60.0% or less (1) To (10).
(12) 質量比ZnO/(MgO+CaO+SrO+BaO)が0.20以下である(1)から(11)のいずれか記載の光学ガラス。
(12) The optical glass according to any one of (1) to (11), wherein the mass ratio ZnO / (MgO + CaO + SrO + BaO) is 0.20 or less.
(13) 質量%で、B2O3成分の含有量が30.0%以下である(1)から(12)のいずれか記載の光学ガラス。
(13) The optical glass according to any one of (1) to (12), wherein the content of the B 2 O 3 component is 30.0% by mass or less.
(14) 質量%で
Li2O成分 0~15.0%
Na2O成分 0~15.0%
K2O成分 0~15.0%
Cs2O成分 0~10.0%
である(1)から(13)のいずれか記載の光学ガラス。 (14) Li 2 O component by mass% 0 to 15.0%
Na 2 O component 0-15.0%
K 2 O component 0-15.0%
Cs 2 O component 0 to 10.0%
The optical glass according to any one of (1) to (13).
Li2O成分 0~15.0%
Na2O成分 0~15.0%
K2O成分 0~15.0%
Cs2O成分 0~10.0%
である(1)から(13)のいずれか記載の光学ガラス。 (14) Li 2 O component by mass% 0 to 15.0%
Na 2 O component 0-15.0%
K 2 O component 0-15.0%
Cs 2 O component 0 to 10.0%
The optical glass according to any one of (1) to (13).
(15) Rn2O成分(式中、RnはLi、Na、K、Csからなる群より選択される1種以上)の質量和が20.0%以下である(1)から(14)のいずれか記載の光学ガラス。
(15) The mass sum of the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is 20.0% or less, from (1) to (14) Any one of the optical glasses.
(16) 質量%で
Y2O3成分 0~20.0%
La2O3成分 0~20.0%
Gd2O3成分 0~20.0%
Yb2O3成分 0~20.0%
である(1)から(15)のいずれか記載の光学ガラス。 (16) Y 2 O 3 component by mass% 0 to 20.0%
La 2 O 3 component 0-20.0%
Gd 2 O 3 component 0-20.0%
Yb 2 O 3 component 0-20.0%
The optical glass according to any one of (1) to (15).
Y2O3成分 0~20.0%
La2O3成分 0~20.0%
Gd2O3成分 0~20.0%
Yb2O3成分 0~20.0%
である(1)から(15)のいずれか記載の光学ガラス。 (16) Y 2 O 3 component by mass% 0 to 20.0%
La 2 O 3 component 0-20.0%
Gd 2 O 3 component 0-20.0%
Yb 2 O 3 component 0-20.0%
The optical glass according to any one of (1) to (15).
(17) 質量比La2O3/(BaO+CaO)が0.65以下である(1)から(16)のいずれか記載の光学ガラス。
(17) The optical glass according to any one of (1) to (16), wherein the mass ratio La 2 O 3 / (BaO + CaO) is 0.65 or less.
(18) 質量%で
P2O5成分 0~20.0%
GeO2成分 0~10.0%
Al2O3成分 0~30.0%
WO3成分 0~20.0%
Ta2O5成分 0~15.0%
Bi2O3成分 0~10.0%
TeO2成分 0~30.0%
Sb2O3成分 0~3.0%
である(1)から(17)のいずれか記載の光学ガラス。 (18) P 2 O 5 component by mass% 0 to 20.0%
GeO 2 component 0 ~ 10.0%
Al 2 O 3 component 0-30.0%
WO 3 component 0-20.0%
Ta 2 O 5 component 0 ~ 15.0%
Bi 2 O 3 component 0 to 10.0%
TeO 2 component 0-30.0%
Sb 2 O 3 component 0-3.0%
The optical glass according to any one of (1) to (17).
P2O5成分 0~20.0%
GeO2成分 0~10.0%
Al2O3成分 0~30.0%
WO3成分 0~20.0%
Ta2O5成分 0~15.0%
Bi2O3成分 0~10.0%
TeO2成分 0~30.0%
Sb2O3成分 0~3.0%
である(1)から(17)のいずれか記載の光学ガラス。 (18) P 2 O 5 component by mass% 0 to 20.0%
GeO 2 component 0 ~ 10.0%
Al 2 O 3 component 0-30.0%
WO 3 component 0-20.0%
Ta 2 O 5 component 0 ~ 15.0%
Bi 2 O 3 component 0 to 10.0%
TeO 2 component 0-30.0%
Sb 2 O 3 component 0-3.0%
The optical glass according to any one of (1) to (17).
(19) 1.70以上2.20以下の屈折率(nd)を有し、25以上35以下のアッベ数(νd)を有する(1)から(18)のいずれか記載の光学ガラス。
(19) The optical glass according to any one of (1) to (18), having a refractive index (nd) of 1.70 to 2.20 and an Abbe number (νd) of 25 to 35.
(20) 分光透過率が70%を示す波長(λ70)が450nm以下である(1)から(19)のいずれか記載の光学ガラス。
(20) The optical glass according to any one of (1) to (19), wherein a wavelength (λ 70 ) having a spectral transmittance of 70% is 450 nm or less.
(21) (1)から(20)のいずれか記載の光学ガラスからなる研磨加工用及び/又は精密プレス成形用のプリフォーム。
(21) A preform for polishing and / or precision press molding made of the optical glass according to any one of (1) to (20).
(22) (1)から(20)のいずれか記載の光学ガラスを研削及び/又は研磨してなる光学素子。
(22) An optical element obtained by grinding and / or polishing the optical glass according to any one of (1) to (20).
(23) (1)から(20)のいずれか記載の光学ガラスを精密プレス成形してなる光学素子。
(23) An optical element formed by precision press-molding the optical glass according to any one of (1) to (20).
本発明によれば、屈折率(nd)が所望の範囲内にありながら、アッベ数(νd)が小さく、部分分散比(θg,F)が小さく、且つ可視光に対する透明性が高められた光学ガラスと、これを用いたプリフォーム及び光学素子を得ることができる。
According to the present invention, while the refractive index (n d ) is within a desired range, the Abbe number (ν d ) is small, the partial dispersion ratio (θg, F) is small, and the transparency to visible light is enhanced. Optical glass, and a preform and an optical element using the optical glass can be obtained.
本発明の光学ガラスは、質量%で、SiO2成分を5.0%以上40.0%以下、CaO成分を5.0%以上40.0%以下、及びNb2O5成分を15.0%以上50.0%以下含有し、部分分散比(θg,F)がアッベ数(νd)との間で、νd≦31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00275×νd+0.68125)の関係を満たし、νd>31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00162×νd+0.64622)の関係を満たす。SiO2成分やCaO成分、Nb2O5成分を併用し、これらの含有量を所定の範囲内にすることによって、高い屈折率を得ながらも、低いアッベ数や部分分散比が得られ、且つガラスの失透が低減される。特に、SiO2成分及びCaO成分の含有量を所定の範囲内にすることによって、アッベ数(νd)の低下が図られ、且つガラスの着色が低減される。また、Nb2O5成分の含有量を所定の範囲内にすることによって、低いアッベ数や低い部分分散比が得られながらも、ガラスの失透が低減される。このため、屈折率(nd)が所望の範囲内にありながら、アッベ数(νd)が小さく、部分分散比(θg,F)が小さく、可視光に対する透明性が高い光学ガラスと、これを用いたプリフォーム及び光学素子を得ることができる。
The optical glass of the present invention is 5.0% by mass and the SiO 2 component is 5.0% or more and 40.0% or less, the CaO component is 5.0% or more and 40.0% or less, and the Nb 2 O 5 component is 15.0% by mass. % To 50.0% and a partial dispersion ratio (θg, F) within the range of νd ≦ 31 between the Abbe number (νd) and (−0.00162 × νd + 0.63822) ≦ (θg, F ) ≦ (−0.00275 × νd + 0.68125), and in the range of νd> 31, (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (−0.00162 × νd + 0.64622) Satisfy the relationship. By using the SiO 2 component, the CaO component, and the Nb 2 O 5 component together, and setting these contents within a predetermined range, a low Abbe number and partial dispersion ratio can be obtained while obtaining a high refractive index, and Glass devitrification is reduced. In particular, by setting the contents of the SiO 2 component and the CaO component within predetermined ranges, the Abbe number (ν d ) can be reduced and the coloring of the glass can be reduced. Further, by setting the content of the Nb 2 O 5 component within a predetermined range, devitrification of the glass is reduced while a low Abbe number and a low partial dispersion ratio are obtained. Therefore, an optical glass having a low Abbe number (ν d ), a small partial dispersion ratio (θg, F), and a high transparency to visible light, while the refractive index (n d ) is within a desired range, A preform and an optical element using can be obtained.
以下、本発明の光学ガラスの実施形態について詳細に説明するが、本発明は、以下の実施形態に何ら限定されるものではなく、本発明の目的の範囲内において、適宜変更を加えて実施できる。なお、説明が重複する箇所については、適宜説明を省略する場合があるが、発明の趣旨を限定するものではない。
Hereinafter, embodiments of the optical glass of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention. . In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited.
[ガラス成分]
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。本明細書中で特に断りがない場合、各成分の含有量は、全て酸化物換算組成のガラス全質量に対する質量%で表示されるものとする。ここで、「酸化物換算組成」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、金属弗化物等が熔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質量を100質量%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。 [Glass component]
The composition range of each component constituting the optical glass of the present invention is described below. Unless otherwise specified in the present specification, the contents of the respective components are all expressed in mass% with respect to the total mass of the glass in terms of oxide. Here, the “oxide equivalent 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 mass of the said production | generation oxide into 100 mass%.
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。本明細書中で特に断りがない場合、各成分の含有量は、全て酸化物換算組成のガラス全質量に対する質量%で表示されるものとする。ここで、「酸化物換算組成」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、金属弗化物等が熔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質量を100質量%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。 [Glass component]
The composition range of each component constituting the optical glass of the present invention is described below. Unless otherwise specified in the present specification, the contents of the respective components are all expressed in mass% with respect to the total mass of the glass in terms of oxide. Here, the “oxide equivalent 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 mass of the said production | generation oxide into 100 mass%.
<必須成分、任意成分について>
SiO2成分は、安定なガラス形成を促し、光学ガラスとして好ましくない失透(結晶物の発生)を低減する必須成分である。
特に、SiO2成分の含有量を5.0%以上にすることで、ガラスの部分分散比を大幅に高めることなく、耐失透性に優れたガラスを得ることができる。また、これにより再加熱時における失透や着色を低減できる。従って、SiO2成分の含有量は、好ましくは5.0%、より好ましくは9.0%、さらに好ましくは14.0%を下限とする。
一方で、SiO2成分の含有量を40.0%以下にすることで、ガラスの屈折率が低下し難くなることで所望の高い屈折率を得易くすることができ、且つ、ガラスの部分分散比の上昇を抑えることができる。また、これによりガラスの溶融性を良好に保つことができる。従って、SiO2成分の含有量は、好ましくは40.0%、より好ましくは30.0%、さらに好ましくは25.0%を上限とする。
SiO2成分は、原料としてSiO2、K2SiF6、Na2SiF6等を用いることができる。 <About essential and optional components>
The SiO 2 component is an essential component that promotes stable glass formation and reduces devitrification (generation of crystalline substances), which is not desirable as an optical glass.
In particular, when the content of the SiO 2 component is 5.0% or more, a glass having excellent devitrification resistance can be obtained without significantly increasing the partial dispersion ratio of the glass. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the SiO 2 component is preferably 5.0%, more preferably 9.0%, and still more preferably 14.0%.
On the other hand, by making the content of SiO 2 component 40.0% or less, it is possible to easily obtain a desired high refractive index by making it difficult for the refractive index of the glass to decrease, and partial dispersion of the glass An increase in the ratio can be suppressed. Moreover, the meltability of the glass can be kept good. Accordingly, the upper limit of the content of the SiO 2 component is preferably 40.0%, more preferably 30.0%, and even more preferably 25.0%.
As the SiO 2 component, SiO 2 , K 2 SiF 6 , Na 2 SiF 6 or the like can be used as a raw material.
SiO2成分は、安定なガラス形成を促し、光学ガラスとして好ましくない失透(結晶物の発生)を低減する必須成分である。
特に、SiO2成分の含有量を5.0%以上にすることで、ガラスの部分分散比を大幅に高めることなく、耐失透性に優れたガラスを得ることができる。また、これにより再加熱時における失透や着色を低減できる。従って、SiO2成分の含有量は、好ましくは5.0%、より好ましくは9.0%、さらに好ましくは14.0%を下限とする。
一方で、SiO2成分の含有量を40.0%以下にすることで、ガラスの屈折率が低下し難くなることで所望の高い屈折率を得易くすることができ、且つ、ガラスの部分分散比の上昇を抑えることができる。また、これによりガラスの溶融性を良好に保つことができる。従って、SiO2成分の含有量は、好ましくは40.0%、より好ましくは30.0%、さらに好ましくは25.0%を上限とする。
SiO2成分は、原料としてSiO2、K2SiF6、Na2SiF6等を用いることができる。 <About essential and optional components>
The SiO 2 component is an essential component that promotes stable glass formation and reduces devitrification (generation of crystalline substances), which is not desirable as an optical glass.
In particular, when the content of the SiO 2 component is 5.0% or more, a glass having excellent devitrification resistance can be obtained without significantly increasing the partial dispersion ratio of the glass. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the SiO 2 component is preferably 5.0%, more preferably 9.0%, and still more preferably 14.0%.
On the other hand, by making the content of SiO 2 component 40.0% or less, it is possible to easily obtain a desired high refractive index by making it difficult for the refractive index of the glass to decrease, and partial dispersion of the glass An increase in the ratio can be suppressed. Moreover, the meltability of the glass can be kept good. Accordingly, the upper limit of the content of the SiO 2 component is preferably 40.0%, more preferably 30.0%, and even more preferably 25.0%.
As the SiO 2 component, SiO 2 , K 2 SiF 6 , Na 2 SiF 6 or the like can be used as a raw material.
CaO成分は、アッベ数が低く耐失透性の高いガラスを得るために必要な必須成分である。
特に、CaO成分の含有量を5.0%以上にすることで、アッベ数が低く耐失透性の高い光学ガラスを得ることができ、且つガラスの溶解性を高めることができる。従って、CaO成分の含有量は、好ましくは5.0%、より好ましくは7.0%、さらに好ましくは9.0%、さらに好ましくは11.0%、さらに好ましくは15.0%を下限とする。
一方で、CaO成分の含有量を40.0%以下にすることで、ガラスの屈折率の低下やアッベ数の上昇、部分分散比の上昇を抑制しつつ、CaO成分の過剰な含有によるガラスの耐失透性の悪化を抑制できる。また、これにより再加熱時における失透や着色を低減できる。従って、CaO成分の含有量は、好ましくは40.0%、より好ましくは35.0%、さらに好ましくは30.0%、さらに好ましくは27.0%を上限とする。
CaO成分は、原料としてCaCO3、CaF2等を用いることができる。 The CaO component is an essential component necessary for obtaining a glass having a low Abbe number and high devitrification resistance.
In particular, when the content of the CaO component is 5.0% or more, an optical glass having a low Abbe number and high devitrification resistance can be obtained, and the solubility of the glass can be increased. Therefore, the content of the CaO component is preferably 5.0%, more preferably 7.0%, still more preferably 9.0%, still more preferably 11.0%, and further preferably 15.0%. To do.
On the other hand, by making the content of the CaO component 40.0% or less, while suppressing a decrease in the refractive index of the glass, an increase in the Abbe number, and an increase in the partial dispersion ratio, the glass due to the excessive content of the CaO component. Deterioration of devitrification resistance can be suppressed. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the upper limit of the CaO component content is preferably 40.0%, more preferably 35.0%, still more preferably 30.0%, and even more preferably 27.0%.
As the CaO component, CaCO 3 , CaF 2 or the like can be used as a raw material.
特に、CaO成分の含有量を5.0%以上にすることで、アッベ数が低く耐失透性の高い光学ガラスを得ることができ、且つガラスの溶解性を高めることができる。従って、CaO成分の含有量は、好ましくは5.0%、より好ましくは7.0%、さらに好ましくは9.0%、さらに好ましくは11.0%、さらに好ましくは15.0%を下限とする。
一方で、CaO成分の含有量を40.0%以下にすることで、ガラスの屈折率の低下やアッベ数の上昇、部分分散比の上昇を抑制しつつ、CaO成分の過剰な含有によるガラスの耐失透性の悪化を抑制できる。また、これにより再加熱時における失透や着色を低減できる。従って、CaO成分の含有量は、好ましくは40.0%、より好ましくは35.0%、さらに好ましくは30.0%、さらに好ましくは27.0%を上限とする。
CaO成分は、原料としてCaCO3、CaF2等を用いることができる。 The CaO component is an essential component necessary for obtaining a glass having a low Abbe number and high devitrification resistance.
In particular, when the content of the CaO component is 5.0% or more, an optical glass having a low Abbe number and high devitrification resistance can be obtained, and the solubility of the glass can be increased. Therefore, the content of the CaO component is preferably 5.0%, more preferably 7.0%, still more preferably 9.0%, still more preferably 11.0%, and further preferably 15.0%. To do.
On the other hand, by making the content of the CaO component 40.0% or less, while suppressing a decrease in the refractive index of the glass, an increase in the Abbe number, and an increase in the partial dispersion ratio, the glass due to the excessive content of the CaO component. Deterioration of devitrification resistance can be suppressed. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the upper limit of the CaO component content is preferably 40.0%, more preferably 35.0%, still more preferably 30.0%, and even more preferably 27.0%.
As the CaO component, CaCO 3 , CaF 2 or the like can be used as a raw material.
Nb2O5成分は、15.0%以上含有することで、ガラスの耐失透性を高め、ガラスの屈折率を高め、且つアッベ数及び部分分散比を低くできる必須成分である。また、これによりガラスのプレス成形性を高めることができる。従って、Nb2O5成分の含有量は、好ましくは15.0%、より好ましくは20.0%、さらに好ましくは25.0%を下限とする。
一方で、Nb2O5成分の含有量を50.0%以下にすることで、ガラス製造時における溶解温度の上昇を抑制し、且つNb2O5成分の過剰な含有による失透を低減できる。従って、Nb2O5成分の含有量は、好ましくは50.0%、より好ましくは45.0%、さらに好ましくは40.0%、さらに好ましくは37.0%を上限とする。
Nb2O5成分は、原料としてNb2O5等を用いることができる。 By containing 15.0% or more, the Nb 2 O 5 component is an essential component that can increase the devitrification resistance of the glass, increase the refractive index of the glass, and lower the Abbe number and partial dispersion ratio. Moreover, this can improve the press formability of the glass. Therefore, the content of the Nb 2 O 5 component is preferably 15.0%, more preferably 20.0%, and still more preferably 25.0%.
On the other hand, by making the content of the Nb 2 O 5 component 50.0% or less, an increase in the melting temperature during glass production can be suppressed, and devitrification due to excessive content of the Nb 2 O 5 component can be reduced. . Therefore, the content of the Nb 2 O 5 component is preferably 50.0%, more preferably 45.0%, still more preferably 40.0%, and further preferably 37.0%.
As the Nb 2 O 5 component, Nb 2 O 5 or the like can be used as a raw material.
一方で、Nb2O5成分の含有量を50.0%以下にすることで、ガラス製造時における溶解温度の上昇を抑制し、且つNb2O5成分の過剰な含有による失透を低減できる。従って、Nb2O5成分の含有量は、好ましくは50.0%、より好ましくは45.0%、さらに好ましくは40.0%、さらに好ましくは37.0%を上限とする。
Nb2O5成分は、原料としてNb2O5等を用いることができる。 By containing 15.0% or more, the Nb 2 O 5 component is an essential component that can increase the devitrification resistance of the glass, increase the refractive index of the glass, and lower the Abbe number and partial dispersion ratio. Moreover, this can improve the press formability of the glass. Therefore, the content of the Nb 2 O 5 component is preferably 15.0%, more preferably 20.0%, and still more preferably 25.0%.
On the other hand, by making the content of the Nb 2 O 5 component 50.0% or less, an increase in the melting temperature during glass production can be suppressed, and devitrification due to excessive content of the Nb 2 O 5 component can be reduced. . Therefore, the content of the Nb 2 O 5 component is preferably 50.0%, more preferably 45.0%, still more preferably 40.0%, and further preferably 37.0%.
As the Nb 2 O 5 component, Nb 2 O 5 or the like can be used as a raw material.
ZrO2成分は、0%超含有することで、ガラスの屈折率及びアッベ数を高め、部分分散比を低くし、且つ耐失透性を高めることができる任意成分である。また、これにより再加熱時における失透や着色を低減できる。従って、ZrO2成分の含有量は、好ましくは0%超、より好ましくは1.0%、さらに好ましくは3.0%を下限とする。
一方で、ZrO2成分の含有量を15.0%以下にすることで、ガラスの失透を低減でき、且つ、より均質なガラスを得易くできる。従って、ZrO2成分の含有量は、好ましくは15.0%、より好ましくは12.0%、さらに好ましくは10.0%を上限とする。
ZrO2成分は、原料としてZrO2、ZrF4等を用いることができる。 The ZrO 2 component is an optional component that can contain more than 0% to increase the refractive index and Abbe number of the glass, lower the partial dispersion ratio, and increase the devitrification resistance. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the ZrO 2 component is preferably more than 0%, more preferably 1.0%, and still more preferably 3.0%.
On the other hand, by setting the content of the ZrO 2 component to 15.0% or less, devitrification of the glass can be reduced, and more uniform glass can be easily obtained. Therefore, the content of the ZrO 2 component is preferably 15.0%, more preferably 12.0%, and still more preferably 10.0%.
As the ZrO 2 component, ZrO 2 , ZrF 4 or the like can be used as a raw material.
一方で、ZrO2成分の含有量を15.0%以下にすることで、ガラスの失透を低減でき、且つ、より均質なガラスを得易くできる。従って、ZrO2成分の含有量は、好ましくは15.0%、より好ましくは12.0%、さらに好ましくは10.0%を上限とする。
ZrO2成分は、原料としてZrO2、ZrF4等を用いることができる。 The ZrO 2 component is an optional component that can contain more than 0% to increase the refractive index and Abbe number of the glass, lower the partial dispersion ratio, and increase the devitrification resistance. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the ZrO 2 component is preferably more than 0%, more preferably 1.0%, and still more preferably 3.0%.
On the other hand, by setting the content of the ZrO 2 component to 15.0% or less, devitrification of the glass can be reduced, and more uniform glass can be easily obtained. Therefore, the content of the ZrO 2 component is preferably 15.0%, more preferably 12.0%, and still more preferably 10.0%.
As the ZrO 2 component, ZrO 2 , ZrF 4 or the like can be used as a raw material.
Nb2O5成分及びZrO2成分の含有量の和(質量和)は、20.0%以上が好ましい。これにより、屈折率を高めてアッベ数を低くでき、且つ部分分散比を低くできる。従って、質量和(Nb2O5+ZrO2)は、好ましくは20.0%、より好ましくは25.0%、さらに好ましくは30.0%を下限とする。
一方で、質量和(Nb2O5+ZrO2)の上限は、55.0%以下としてもよい。これにより、より耐失透性が高く安定なガラスを得ることができる。従って、質量和(Nb2O5+ZrO2)は、好ましくは55.0%、より好ましくは50.0%、さらに好ましくは45.0%を上限とする。 The sum (mass sum) of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 20.0% or more. Thereby, the refractive index can be increased, the Abbe number can be lowered, and the partial dispersion ratio can be lowered. Therefore, the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 20.0%, more preferably 25.0%, and even more preferably 30.0%.
On the other hand, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) may be 55.0% or less. Thereby, the glass with higher devitrification resistance and stability can be obtained. Accordingly, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 55.0%, more preferably 50.0%, and still more preferably 45.0%.
一方で、質量和(Nb2O5+ZrO2)の上限は、55.0%以下としてもよい。これにより、より耐失透性が高く安定なガラスを得ることができる。従って、質量和(Nb2O5+ZrO2)は、好ましくは55.0%、より好ましくは50.0%、さらに好ましくは45.0%を上限とする。 The sum (mass sum) of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 20.0% or more. Thereby, the refractive index can be increased, the Abbe number can be lowered, and the partial dispersion ratio can be lowered. Therefore, the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 20.0%, more preferably 25.0%, and even more preferably 30.0%.
On the other hand, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) may be 55.0% or less. Thereby, the glass with higher devitrification resistance and stability can be obtained. Accordingly, the upper limit of the mass sum (Nb 2 O 5 + ZrO 2 ) is preferably 55.0%, more preferably 50.0%, and still more preferably 45.0%.
TiO2成分は、0%超含有することで、ガラスの屈折率を高めつつ、アッベ数を低くでき、耐失透性を高められる任意成分である。従って、TiO2成分の含有量は、好ましくは0%超、より好ましくは0.5%超とし、さらに好ましくは1.0%、さらに好ましくは1.2%を下限とする。
一方で、TiO2成分の含有量を20.0%以下にすることで、ガラスの着色を低減でき、ガラスの内部透過率を高められる。また、これにより部分分散比が上昇し難くなるため、ノーマルラインに近い所望の低い部分分散比を得易くできる。従って、TiO2成分の含有量は、好ましくは20.0%、より好ましくは15.0%、さらに好ましくは11.0%、さらに好ましくは9.0%、さらに好ましくは7.0%、さらに好ましくは5.0%を上限とする。
TiO2成分は、原料としてTiO2等を用いることができる。 By containing more than 0% of the TiO 2 component, it is an optional component that can reduce the Abbe's number and increase the devitrification resistance while increasing the refractive index of the glass. Therefore, the content of the TiO 2 component is preferably more than 0%, more preferably more than 0.5%, still more preferably 1.0%, and still more preferably 1.2%.
On the other hand, when the content of the TiO 2 component is 20.0% or less, the coloring of the glass can be reduced, and the internal transmittance of the glass can be increased. In addition, this makes it difficult to increase the partial dispersion ratio, so that a desired low partial dispersion ratio close to the normal line can be easily obtained. Accordingly, the content of the TiO 2 component is preferably 20.0%, more preferably 15.0%, even more preferably 11.0%, still more preferably 9.0%, still more preferably 7.0%, Preferably, the upper limit is 5.0%.
As the TiO 2 component, TiO 2 or the like can be used as a raw material.
一方で、TiO2成分の含有量を20.0%以下にすることで、ガラスの着色を低減でき、ガラスの内部透過率を高められる。また、これにより部分分散比が上昇し難くなるため、ノーマルラインに近い所望の低い部分分散比を得易くできる。従って、TiO2成分の含有量は、好ましくは20.0%、より好ましくは15.0%、さらに好ましくは11.0%、さらに好ましくは9.0%、さらに好ましくは7.0%、さらに好ましくは5.0%を上限とする。
TiO2成分は、原料としてTiO2等を用いることができる。 By containing more than 0% of the TiO 2 component, it is an optional component that can reduce the Abbe's number and increase the devitrification resistance while increasing the refractive index of the glass. Therefore, the content of the TiO 2 component is preferably more than 0%, more preferably more than 0.5%, still more preferably 1.0%, and still more preferably 1.2%.
On the other hand, when the content of the TiO 2 component is 20.0% or less, the coloring of the glass can be reduced, and the internal transmittance of the glass can be increased. In addition, this makes it difficult to increase the partial dispersion ratio, so that a desired low partial dispersion ratio close to the normal line can be easily obtained. Accordingly, the content of the TiO 2 component is preferably 20.0%, more preferably 15.0%, even more preferably 11.0%, still more preferably 9.0%, still more preferably 7.0%, Preferably, the upper limit is 5.0%.
As the TiO 2 component, TiO 2 or the like can be used as a raw material.
Nb2O5成分の含有量に対するTiO2成分の含有量の比率(質量比)は、0.50以下が好ましい。これにより、ガラスの屈折率及びアッベ数が所望の範囲内に調整されながらも部分分散比が低くなるため、所望のアッベ数と部分分散比の関係を有する光学ガラスを得ることができる。それとともに、着色の少ない光学ガラスを得ることができる。従って、質量比TiO2/Nb2O5は、好ましくは0.50、より好ましくは0.40、さらに好ましくは0.33、さらに好ましくは0.25、さらに好ましくは0.20、さらに好ましくは0.172を上限とする。
なお、この比率の下限は、ガラスの耐失透性を高める観点から、好ましくは0超、より好ましくは0.01、さらに好ましくは0.03を下限としてもよい。 The ratio (mass ratio) of the content of the TiO 2 component to the content of the Nb 2 O 5 component is preferably 0.50 or less. Thereby, the partial dispersion ratio is lowered while the refractive index and Abbe number of the glass are adjusted within a desired range, so that an optical glass having a relationship between the desired Abbe number and the partial dispersion ratio can be obtained. At the same time, an optical glass with little coloring can be obtained. Accordingly, the mass ratio TiO 2 / Nb 2 O 5 is preferably 0.50, more preferably 0.40, still more preferably 0.33, still more preferably 0.25, still more preferably 0.20, and even more preferably. The upper limit is 0.172.
The lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
なお、この比率の下限は、ガラスの耐失透性を高める観点から、好ましくは0超、より好ましくは0.01、さらに好ましくは0.03を下限としてもよい。 The ratio (mass ratio) of the content of the TiO 2 component to the content of the Nb 2 O 5 component is preferably 0.50 or less. Thereby, the partial dispersion ratio is lowered while the refractive index and Abbe number of the glass are adjusted within a desired range, so that an optical glass having a relationship between the desired Abbe number and the partial dispersion ratio can be obtained. At the same time, an optical glass with little coloring can be obtained. Accordingly, the mass ratio TiO 2 / Nb 2 O 5 is preferably 0.50, more preferably 0.40, still more preferably 0.33, still more preferably 0.25, still more preferably 0.20, and even more preferably. The upper limit is 0.172.
The lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
Nb2O5成分及びZrO2成分の含有量の和に対するTiO2成分の含有量の比率(質量比)は、0.50以下が好ましい。これにより、より部分分散比の低い光学ガラスを得られる。従って、質量比TiO2/(Nb2O5+ZrO2)は、好ましくは0.50、より好ましくは0.25、さらに好ましくは0.20を上限とし、さらに好ましくは0.14未満とする。
なお、この比率の下限は、ガラスの耐失透性を高める観点から、好ましくは0超、より好ましくは0.01、さらに好ましくは0.03を下限としてもよい。 The ratio (mass ratio) of the TiO 2 component to the sum of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 0.50 or less. Thereby, an optical glass having a lower partial dispersion ratio can be obtained. Therefore, the mass ratio TiO 2 / (Nb 2 O 5 + ZrO 2 ) is preferably 0.50, more preferably 0.25, still more preferably 0.20, and even more preferably less than 0.14.
The lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
なお、この比率の下限は、ガラスの耐失透性を高める観点から、好ましくは0超、より好ましくは0.01、さらに好ましくは0.03を下限としてもよい。 The ratio (mass ratio) of the TiO 2 component to the sum of the contents of the Nb 2 O 5 component and the ZrO 2 component is preferably 0.50 or less. Thereby, an optical glass having a lower partial dispersion ratio can be obtained. Therefore, the mass ratio TiO 2 / (Nb 2 O 5 + ZrO 2 ) is preferably 0.50, more preferably 0.25, still more preferably 0.20, and even more preferably less than 0.14.
The lower limit of this ratio is preferably more than 0, more preferably 0.01, and still more preferably 0.03, from the viewpoint of increasing the devitrification resistance of the glass.
BaO成分は、0%超含有することで、ガラスの屈折率を高められ、ガラスの部分分散比を低くでき、且つガラスの耐失透性や溶解性を高められる任意成分である。また、これにより再加熱時における失透や着色を低減できる。従って、BaO成分の含有量は、好ましくは0%超、より好ましくは1.0%、さらに好ましくは4.0%を下限としてもよい。
一方で、BaO成分の含有量を30.0%以下にすることで、BaO成分の過剰な含有による耐失透性や化学的耐久性の悪化を抑制できる。従って、BaO成分の含有量は、好ましくは30.0%、より好ましくは25.0%、さらに好ましくは20.0%を上限とする。
BaO成分は、原料としてBaCO3、Ba(NO3)2等を用いることができる。 The BaO component is an optional component that can increase the refractive index of the glass, reduce the partial dispersion ratio of the glass, and increase the devitrification resistance and solubility of the glass by containing more than 0%. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the BaO component is preferably more than 0%, more preferably 1.0%, and even more preferably 4.0%.
On the other hand, by setting the content of the BaO component to 30.0% or less, deterioration of devitrification resistance and chemical durability due to excessive inclusion of the BaO component can be suppressed. Accordingly, the upper limit of the content of the BaO component is preferably 30.0%, more preferably 25.0%, and even more preferably 20.0%.
As the BaO component, BaCO 3 , Ba (NO 3 ) 2 or the like can be used as a raw material.
一方で、BaO成分の含有量を30.0%以下にすることで、BaO成分の過剰な含有による耐失透性や化学的耐久性の悪化を抑制できる。従って、BaO成分の含有量は、好ましくは30.0%、より好ましくは25.0%、さらに好ましくは20.0%を上限とする。
BaO成分は、原料としてBaCO3、Ba(NO3)2等を用いることができる。 The BaO component is an optional component that can increase the refractive index of the glass, reduce the partial dispersion ratio of the glass, and increase the devitrification resistance and solubility of the glass by containing more than 0%. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the BaO component is preferably more than 0%, more preferably 1.0%, and even more preferably 4.0%.
On the other hand, by setting the content of the BaO component to 30.0% or less, deterioration of devitrification resistance and chemical durability due to excessive inclusion of the BaO component can be suppressed. Accordingly, the upper limit of the content of the BaO component is preferably 30.0%, more preferably 25.0%, and even more preferably 20.0%.
As the BaO component, BaCO 3 , Ba (NO 3 ) 2 or the like can be used as a raw material.
CaO成分の含有量に対するBaO成分の含有量の比率(質量比)は、0.15より大きいことが好ましい。これにより、部分分散比を高める成分であるCaO成分の含有量に対して、部分分散比を低くする成分であるBaO成分の含有量が増加するため、光学ガラスの部分分散比をより低くできる。また、これにより屈折率をより高めることができる。従って、質量比(BaO/CaO)は、好ましくは0.15超、より好ましくは0.20超、さらに好ましくは0.25超とする。
一方で、この比率の上限は特に限定されないが、好ましくは2.00、より詳細には1.50、さらに詳細には1.20を上限としてもよい。 The ratio (mass ratio) of the BaO component content to the CaO component content is preferably greater than 0.15. Thereby, since content of the BaO component which is a component which makes a partial dispersion ratio low increases with respect to content of the CaO component which is a component which raises partial dispersion ratio, the partial dispersion ratio of optical glass can be made lower. Further, this can further increase the refractive index. Therefore, the mass ratio (BaO / CaO) is preferably more than 0.15, more preferably more than 0.20, and even more preferably more than 0.25.
On the other hand, the upper limit of this ratio is not particularly limited, but is preferably 2.00, more specifically 1.50, and even more specifically 1.20.
一方で、この比率の上限は特に限定されないが、好ましくは2.00、より詳細には1.50、さらに詳細には1.20を上限としてもよい。 The ratio (mass ratio) of the BaO component content to the CaO component content is preferably greater than 0.15. Thereby, since content of the BaO component which is a component which makes a partial dispersion ratio low increases with respect to content of the CaO component which is a component which raises partial dispersion ratio, the partial dispersion ratio of optical glass can be made lower. Further, this can further increase the refractive index. Therefore, the mass ratio (BaO / CaO) is preferably more than 0.15, more preferably more than 0.20, and even more preferably more than 0.25.
On the other hand, the upper limit of this ratio is not particularly limited, but is preferably 2.00, more specifically 1.50, and even more specifically 1.20.
MgO成分は、0%超含有することでガラスの溶融温度を低下できる任意成分である。
一方で、MgO成分の含有量を20.0%以下にすることで、ガラスの屈折率の低下を抑制しつつ、ガラスの失透を低減できる。また、これにより再加熱時における失透や着色を低減できる。従って、MgO成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
MgO成分は、原料としてMgO、MgCO3、MgF2等を用いることができる。 The MgO component is an optional component that can lower the melting temperature of the glass by containing more than 0%.
On the other hand, by setting the content of the MgO component to 20.0% or less, devitrification of the glass can be reduced while suppressing a decrease in the refractive index of the glass. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the MgO component is preferably 20.0%, more preferably 10.0%, and further preferably 5.0%.
As the MgO component, MgO, MgCO 3 , MgF 2 or the like can be used as a raw material.
一方で、MgO成分の含有量を20.0%以下にすることで、ガラスの屈折率の低下を抑制しつつ、ガラスの失透を低減できる。また、これにより再加熱時における失透や着色を低減できる。従って、MgO成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
MgO成分は、原料としてMgO、MgCO3、MgF2等を用いることができる。 The MgO component is an optional component that can lower the melting temperature of the glass by containing more than 0%.
On the other hand, by setting the content of the MgO component to 20.0% or less, devitrification of the glass can be reduced while suppressing a decrease in the refractive index of the glass. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Therefore, the content of the MgO component is preferably 20.0%, more preferably 10.0%, and further preferably 5.0%.
As the MgO component, MgO, MgCO 3 , MgF 2 or the like can be used as a raw material.
SrO成分は、0%超含有することで、ガラスの屈折率を高められ、且つ耐失透性を高められる任意成分である。
特に、SrO成分の含有量を25.0%以下にすることで、ガラスの化学的耐久性の悪化を抑制できる。従って、SrO成分の含有量は、好ましくは25.0%、より好ましくは15.0%、さらに好ましくは10.0%、さらに好ましくは4.0%を上限とする。
SrO成分は、原料としてSr(NO3)2、SrF2等を用いることができる。 By containing more than 0%, the SrO component is an optional component that can increase the refractive index of the glass and increase the devitrification resistance.
In particular, the deterioration of the chemical durability of the glass can be suppressed by setting the content of the SrO component to 25.0% or less. Therefore, the SrO component content is preferably 25.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 4.0%.
As the SrO component, Sr (NO 3 ) 2 , SrF 2 or the like can be used as a raw material.
特に、SrO成分の含有量を25.0%以下にすることで、ガラスの化学的耐久性の悪化を抑制できる。従って、SrO成分の含有量は、好ましくは25.0%、より好ましくは15.0%、さらに好ましくは10.0%、さらに好ましくは4.0%を上限とする。
SrO成分は、原料としてSr(NO3)2、SrF2等を用いることができる。 By containing more than 0%, the SrO component is an optional component that can increase the refractive index of the glass and increase the devitrification resistance.
In particular, the deterioration of the chemical durability of the glass can be suppressed by setting the content of the SrO component to 25.0% or less. Therefore, the SrO component content is preferably 25.0%, more preferably 15.0%, still more preferably 10.0%, and still more preferably 4.0%.
As the SrO component, Sr (NO 3 ) 2 , SrF 2 or the like can be used as a raw material.
ZnO成分は、0%超含有することで、ガラスの耐失透性を高め、ガラス転移点を下げられる任意成分である。
一方で、ZnO成分の含有量を15.0%以下にすることで、ガラスの再加熱時における失透や着色を低減しつつ、ガラスの化学的耐久性を高められる。従って、ZnO成分の含有量は、好ましくは15.0%を上限とし、より好ましくは8.0%未満とし、さらに好ましくは5.0%、さらに好ましくは3.5%を上限とする。
ZnO成分は、原料としてZnO、ZnF2等を用いることができる。 The ZnO component is an optional component that increases the devitrification resistance of the glass and lowers the glass transition point by containing more than 0%.
On the other hand, by setting the content of the ZnO component to 15.0% or less, the chemical durability of the glass can be enhanced while reducing devitrification and coloring during reheating of the glass. Therefore, the upper limit of the content of the ZnO component is preferably 15.0%, more preferably less than 8.0%, still more preferably 5.0%, and still more preferably 3.5%.
As the ZnO component, ZnO, ZnF 2 or the like can be used as a raw material.
一方で、ZnO成分の含有量を15.0%以下にすることで、ガラスの再加熱時における失透や着色を低減しつつ、ガラスの化学的耐久性を高められる。従って、ZnO成分の含有量は、好ましくは15.0%を上限とし、より好ましくは8.0%未満とし、さらに好ましくは5.0%、さらに好ましくは3.5%を上限とする。
ZnO成分は、原料としてZnO、ZnF2等を用いることができる。 The ZnO component is an optional component that increases the devitrification resistance of the glass and lowers the glass transition point by containing more than 0%.
On the other hand, by setting the content of the ZnO component to 15.0% or less, the chemical durability of the glass can be enhanced while reducing devitrification and coloring during reheating of the glass. Therefore, the upper limit of the content of the ZnO component is preferably 15.0%, more preferably less than 8.0%, still more preferably 5.0%, and still more preferably 3.5%.
As the ZnO component, ZnO, ZnF 2 or the like can be used as a raw material.
RO成分(式中、RはMg、Ca、Sr、Ba、Znからなる群より選択される1種以上)の含有量の合計(質量和)は、10.0%以上60.0%以下が好ましい。
特に、RO成分を10.0%以上含有することで、ガラスの耐失透性を高めることができる。従って、RO成分の合計含有量は、好ましくは10.0%、より好ましくは17.0%、より好ましくは25.0%、さらに好ましくは30.0%を下限とする。
一方で、RO成分の含有量を60.0%以下にすることで、これら成分の過剰な含有によるガラスの失透を低減でき、且つガラスの化学的耐久性も高められる。従って、RO成分の合計含有量は、好ましくは60.0%、より好ましくは50.0%、さらに好ましくは40.0%を上限とする。 The total content (mass sum) of RO components (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, Zn) is 10.0% or more and 60.0% or less. preferable.
In particular, the devitrification resistance of the glass can be increased by containing 10.0% or more of the RO component. Therefore, the total content of RO components is preferably 10.0%, more preferably 17.0%, more preferably 25.0%, and still more preferably 30.0%.
On the other hand, by setting the content of the RO component to 60.0% or less, devitrification of the glass due to excessive inclusion of these components can be reduced, and the chemical durability of the glass can be enhanced. Therefore, the total content of RO components is preferably 60.0%, more preferably 50.0%, and still more preferably 40.0%.
特に、RO成分を10.0%以上含有することで、ガラスの耐失透性を高めることができる。従って、RO成分の合計含有量は、好ましくは10.0%、より好ましくは17.0%、より好ましくは25.0%、さらに好ましくは30.0%を下限とする。
一方で、RO成分の含有量を60.0%以下にすることで、これら成分の過剰な含有によるガラスの失透を低減でき、且つガラスの化学的耐久性も高められる。従って、RO成分の合計含有量は、好ましくは60.0%、より好ましくは50.0%、さらに好ましくは40.0%を上限とする。 The total content (mass sum) of RO components (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, Zn) is 10.0% or more and 60.0% or less. preferable.
In particular, the devitrification resistance of the glass can be increased by containing 10.0% or more of the RO component. Therefore, the total content of RO components is preferably 10.0%, more preferably 17.0%, more preferably 25.0%, and still more preferably 30.0%.
On the other hand, by setting the content of the RO component to 60.0% or less, devitrification of the glass due to excessive inclusion of these components can be reduced, and the chemical durability of the glass can be enhanced. Therefore, the total content of RO components is preferably 60.0%, more preferably 50.0%, and still more preferably 40.0%.
MgO成分、CaO成分、SrO成分及びBaO成分の合計含有量に対するZnO成分の含有量の比率(質量比)は、0.20以下が好ましい。これにより、ガラスの耐失透性をより高めつつ、ガラスの再加熱時における失透や着色を低減できる。従って、質量比ZnO/(MgO+CaO+SrO+BaO)は、好ましくは0.20、より好ましくは0.10、さらに好ましくは0.07を上限とする。
The ratio (mass ratio) of the ZnO component to the total content of MgO component, CaO component, SrO component and BaO component is preferably 0.20 or less. Thereby, the devitrification and coloring at the time of reheating of glass can be reduced, improving the devitrification resistance of glass more. Therefore, the mass ratio ZnO / (MgO + CaO + SrO + BaO) is preferably 0.20, more preferably 0.10, and still more preferably 0.07.
B2O3成分は、0%超含有することで、安定なガラス形成を促すことで耐失透性を高められ、且つガラスの溶解性を高められる任意成分である。従って、B2O3成分の含有量は、好ましくは0%超、より好ましくは0.5%、さらに好ましくは1.0%、さらに好ましくは1.3%を下限としてもよいが、0%であってもよい。
一方で、B2O3成分の含有量を30.0%以下にすることで、屈折率の低下を抑えられ、且つガラスの部分分散比の上昇を抑えられる。また、これによりガラスの再加熱時における失透を低減できる。従って、B2O3成分の含有量は、好ましくは30.0%、より好ましくは20.0%を上限とし、さらに好ましくは13.0%未満とし、さらに好ましくは10.0%、さらに好ましくは7.0%を上限とする。
B2O3成分は、原料としてH3BO3、Na2B4O7、Na2B4O7・10H2O、BPO4等を用いることができる。 By containing more than 0%, the B 2 O 3 component is an optional component that can enhance the devitrification resistance and promote the glass solubility by promoting stable glass formation. Therefore, the content of the B 2 O 3 component is preferably more than 0%, more preferably 0.5%, even more preferably 1.0%, and even more preferably 1.3%. It may be.
On the other hand, by setting the content of the B 2 O 3 component to 30.0% or less, a decrease in the refractive index can be suppressed and an increase in the partial dispersion ratio of the glass can be suppressed. Moreover, devitrification at the time of reheating of glass can be reduced thereby. Therefore, the content of the B 2 O 3 component is preferably 30.0%, more preferably 20.0% as an upper limit, further preferably less than 13.0%, still more preferably 10.0%, still more preferably The upper limit is 7.0%.
As the B 2 O 3 component, H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 .10H 2 O, BPO 4 or the like can be used as a raw material.
一方で、B2O3成分の含有量を30.0%以下にすることで、屈折率の低下を抑えられ、且つガラスの部分分散比の上昇を抑えられる。また、これによりガラスの再加熱時における失透を低減できる。従って、B2O3成分の含有量は、好ましくは30.0%、より好ましくは20.0%を上限とし、さらに好ましくは13.0%未満とし、さらに好ましくは10.0%、さらに好ましくは7.0%を上限とする。
B2O3成分は、原料としてH3BO3、Na2B4O7、Na2B4O7・10H2O、BPO4等を用いることができる。 By containing more than 0%, the B 2 O 3 component is an optional component that can enhance the devitrification resistance and promote the glass solubility by promoting stable glass formation. Therefore, the content of the B 2 O 3 component is preferably more than 0%, more preferably 0.5%, even more preferably 1.0%, and even more preferably 1.3%. It may be.
On the other hand, by setting the content of the B 2 O 3 component to 30.0% or less, a decrease in the refractive index can be suppressed and an increase in the partial dispersion ratio of the glass can be suppressed. Moreover, devitrification at the time of reheating of glass can be reduced thereby. Therefore, the content of the B 2 O 3 component is preferably 30.0%, more preferably 20.0% as an upper limit, further preferably less than 13.0%, still more preferably 10.0%, still more preferably The upper limit is 7.0%.
As the B 2 O 3 component, H 3 BO 3 , Na 2 B 4 O 7 , Na 2 B 4 O 7 .10H 2 O, BPO 4 or the like can be used as a raw material.
Li2O成分、Na2O成分及びK2O成分は、0%超含有することで、ガラスの部分分散比を低くでき、ガラスの溶融性を高められ、且つガラス転移点を低くできる任意成分である。
一方で、Li2O成分の含有量を15.0%以下にすることで、屈折率の低下を抑えるとともに、Li2O成分の過剰な含有によるガラスの形成時や再加熱時の乳白化や結晶析出を低減しつつ、ガラスの化学的耐久性を高めることができる。
また、Na2O成分の含有量を15.0%以下にすることで、屈折率を低下し難くするとともに、化学的耐久性を悪化し難くできる。また、ガラス形成時における耐失透性を高め、再加熱時における失透や着色を低減できる。
また、K2O成分の含有量を15.0%以下にすることで、ガラス形成時における耐失透性を高め、再加熱時における失透や着色を低減できる。
従って、Li2O成分、Na2O成分及びK2O成分の各々の含有量は、好ましくは15.0%、より好ましくは10.0%、さらに好ましくは7.0%、さらに好ましくは5.0%を上限とする。
Li2O成分、Na2O成分及びK2O成分は、原料としてLi2CO3、LiNO3、LiF、Na2CO3、NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6等を用いることができる。 Li 2 O component, Na 2 O component, and K 2 O component are optional components that can lower the partial dispersion ratio of the glass, increase the meltability of the glass, and lower the glass transition point by containing more than 0%. It is.
On the other hand, by making the content of the Li 2 O component 15.0% or less, while suppressing the decrease in the refractive index, the whitening at the time of glass formation and reheating due to excessive inclusion of the Li 2 O component, The chemical durability of the glass can be enhanced while reducing crystal precipitation.
Further, by the content of Na 2 O component below 15.0%, while less likely to lower the refractive index, it is difficult to deteriorate chemical durability. Moreover, devitrification resistance at the time of glass formation can be improved, and devitrification and coloring at the time of reheating can be reduced.
Further, by the content of K 2 O component below 15.0%, enhances devitrification resistance during glass forming, it is possible to reduce the devitrification or coloring upon reheating.
Therefore, the content of each of the Li 2 O component, Na 2 O component and K 2 O component is preferably 15.0%, more preferably 10.0%, still more preferably 7.0%, and even more preferably 5%. 0.0% is the upper limit.
Li 2 O component, Na 2 O component, and K 2 O component are Li 2 CO 3 , LiNO 3 , LiF, Na 2 CO 3 , NaNO 3 , NaF, Na 2 SiF 6 , K 2 CO 3 , KNO 3 as raw materials. , KF, KHF 2 , K 2 SiF 6 or the like can be used.
一方で、Li2O成分の含有量を15.0%以下にすることで、屈折率の低下を抑えるとともに、Li2O成分の過剰な含有によるガラスの形成時や再加熱時の乳白化や結晶析出を低減しつつ、ガラスの化学的耐久性を高めることができる。
また、Na2O成分の含有量を15.0%以下にすることで、屈折率を低下し難くするとともに、化学的耐久性を悪化し難くできる。また、ガラス形成時における耐失透性を高め、再加熱時における失透や着色を低減できる。
また、K2O成分の含有量を15.0%以下にすることで、ガラス形成時における耐失透性を高め、再加熱時における失透や着色を低減できる。
従って、Li2O成分、Na2O成分及びK2O成分の各々の含有量は、好ましくは15.0%、より好ましくは10.0%、さらに好ましくは7.0%、さらに好ましくは5.0%を上限とする。
Li2O成分、Na2O成分及びK2O成分は、原料としてLi2CO3、LiNO3、LiF、Na2CO3、NaNO3、NaF、Na2SiF6、K2CO3、KNO3、KF、KHF2、K2SiF6等を用いることができる。 Li 2 O component, Na 2 O component, and K 2 O component are optional components that can lower the partial dispersion ratio of the glass, increase the meltability of the glass, and lower the glass transition point by containing more than 0%. It is.
On the other hand, by making the content of the Li 2 O component 15.0% or less, while suppressing the decrease in the refractive index, the whitening at the time of glass formation and reheating due to excessive inclusion of the Li 2 O component, The chemical durability of the glass can be enhanced while reducing crystal precipitation.
Further, by the content of Na 2 O component below 15.0%, while less likely to lower the refractive index, it is difficult to deteriorate chemical durability. Moreover, devitrification resistance at the time of glass formation can be improved, and devitrification and coloring at the time of reheating can be reduced.
Further, by the content of K 2 O component below 15.0%, enhances devitrification resistance during glass forming, it is possible to reduce the devitrification or coloring upon reheating.
Therefore, the content of each of the Li 2 O component, Na 2 O component and K 2 O component is preferably 15.0%, more preferably 10.0%, still more preferably 7.0%, and even more preferably 5%. 0.0% is the upper limit.
Li 2 O component, Na 2 O component, and K 2 O component are Li 2 CO 3 , LiNO 3 , LiF, Na 2 CO 3 , NaNO 3 , NaF, Na 2 SiF 6 , K 2 CO 3 , KNO 3 as raw materials. , KF, KHF 2 , K 2 SiF 6 or the like can be used.
Cs2O成分は、0%超含有することで、ガラス転移点を低くできる任意成分である。
一方で、Cs2O成分の含有量を10.0%以下にすることで、Cs2O成分の過剰な含有によるガラスの失透を低減できる。従って、Cs2O成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
Cs2O成分は、原料としてCs2CO3、CsNO3等を用いることができる。 Cs 2 O component, by ultra containing 0%, which is an optional component that can be lowered glass transition temperature.
On the other hand, when the content of Cs 2 O component to 10.0% or less, can be reduced devitrification of the glass due to excessive content of Cs 2 O component. Accordingly, the content of the Cs 2 O component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the Cs 2 O component, Cs 2 CO 3 , CsNO 3 or the like can be used as a raw material.
一方で、Cs2O成分の含有量を10.0%以下にすることで、Cs2O成分の過剰な含有によるガラスの失透を低減できる。従って、Cs2O成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
Cs2O成分は、原料としてCs2CO3、CsNO3等を用いることができる。 Cs 2 O component, by ultra containing 0%, which is an optional component that can be lowered glass transition temperature.
On the other hand, when the content of Cs 2 O component to 10.0% or less, can be reduced devitrification of the glass due to excessive content of Cs 2 O component. Accordingly, the content of the Cs 2 O component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the Cs 2 O component, Cs 2 CO 3 , CsNO 3 or the like can be used as a raw material.
Rn2O成分(式中、RnはLi、Na、K、Csからなる群より選択される1種以上)の合計量は、20.0%以下が好ましい。これにより、ガラスの屈折率を低下し難くし、ガラス形成時の失透を低減できる。従って、Rn2O成分の含有量の質量和は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
The total amount of Rn 2 O components (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) is preferably 20.0% or less. Thereby, it is difficult to lower the refractive index of the glass, and devitrification at the time of glass formation can be reduced. Therefore, the upper limit of the mass sum of the content of the Rn 2 O component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分は、0%超含有することで、ガラスの屈折率を高めつつ、部分分散比を小さくできる任意成分である。
一方で、Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量を20.0%以下にすることで、ガラスの失透を低減し、ガラスのアッベ数の上昇を抑え、且つガラスの材料コストを低減できる。特に、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量を15.0%以下にすることで、ガラスの比重を低減できる。従って、Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量は、好ましくは20.0%と上限とし、より好ましくは15.0%未満とし、さらに好ましくは12.0%、さらに好ましくは10.0%を上限とする。
Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分は、原料としてY2O3、YF3、La2O3、La(NO3)3・XH2O(Xは任意の整数)、Gd2O3、GdF3、Yb2O3等を用いることができる。 Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are optional components that can reduce the partial dispersion ratio while increasing the refractive index of glass by containing more than 0%. is there.
On the other hand, devitrification of the glass is reduced by making each content of the Y 2 O 3 component, the La 2 O 3 component, the Gd 2 O 3 component, and the Yb 2 O 3 component 20.0% or less, An increase in the Abbe number of the glass can be suppressed and the material cost of the glass can be reduced. In particular, by La 2 O 3 component, the content of each of Gd 2 O 3 component and Yb 2 O 3 component to 15.0% can be reduced the specific gravity of glass. Accordingly, the content of each of the Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component is preferably 20.0%, and more preferably less than 15.0%. More preferably, the upper limit is 12.0%, more preferably 10.0%.
Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are Y 2 O 3 , YF 3 , La 2 O 3 , La (NO 3 ) 3 .XH 2 O as raw materials. (X is an arbitrary integer), Gd 2 O 3 , GdF 3 , Yb 2 O 3 and the like can be used.
一方で、Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量を20.0%以下にすることで、ガラスの失透を低減し、ガラスのアッベ数の上昇を抑え、且つガラスの材料コストを低減できる。特に、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量を15.0%以下にすることで、ガラスの比重を低減できる。従って、Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分の各々の含有量は、好ましくは20.0%と上限とし、より好ましくは15.0%未満とし、さらに好ましくは12.0%、さらに好ましくは10.0%を上限とする。
Y2O3成分、La2O3成分、Gd2O3成分及びYb2O3成分は、原料としてY2O3、YF3、La2O3、La(NO3)3・XH2O(Xは任意の整数)、Gd2O3、GdF3、Yb2O3等を用いることができる。 Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are optional components that can reduce the partial dispersion ratio while increasing the refractive index of glass by containing more than 0%. is there.
On the other hand, devitrification of the glass is reduced by making each content of the Y 2 O 3 component, the La 2 O 3 component, the Gd 2 O 3 component, and the Yb 2 O 3 component 20.0% or less, An increase in the Abbe number of the glass can be suppressed and the material cost of the glass can be reduced. In particular, by La 2 O 3 component, the content of each of Gd 2 O 3 component and Yb 2 O 3 component to 15.0% can be reduced the specific gravity of glass. Accordingly, the content of each of the Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component is preferably 20.0%, and more preferably less than 15.0%. More preferably, the upper limit is 12.0%, more preferably 10.0%.
Y 2 O 3 component, La 2 O 3 component, Gd 2 O 3 component and Yb 2 O 3 component are Y 2 O 3 , YF 3 , La 2 O 3 , La (NO 3 ) 3 .XH 2 O as raw materials. (X is an arbitrary integer), Gd 2 O 3 , GdF 3 , Yb 2 O 3 and the like can be used.
BaO成分及びCaO成分の含有量の合計に対するLa2O3成分の含有量の比率(質量比)は、0.65以下が好ましい。これにより、所望の低い部分分散比が得られながらも、ガラスの比重を小さくでき、且つ材料コストを低減できる。従って、質量比La2O3/(BaO+CaO)は、好ましくは0.65、より好ましくは0.50、さらに好ましくは0.40を上限とする。
The ratio (mass ratio) of the content of the La 2 O 3 component to the total content of the BaO component and the CaO component is preferably 0.65 or less. Thereby, it is possible to reduce the specific gravity of the glass and reduce the material cost while obtaining a desired low partial dispersion ratio. Therefore, the mass ratio La 2 O 3 / (BaO + CaO) is preferably 0.65, more preferably 0.50, and still more preferably 0.40.
P2O5成分は、0%超含有することでガラスの安定性を高められる任意成分である。
一方で、P2O5成分の含有量を20.0%以下にすることで、P2O5成分の過剰な含有による失透を低減できる。従って、P2O5成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
P2O5成分は、原料としてAl(PO3)3、Ca(PO3)2、Ba(PO3)2、BPO4、H3PO4等を用いることができる。 P 2 O 5 component is an optional component that enhances the stability of the glass by ultrasonic containing 0%.
On the other hand, when the content of P 2 O 5 component below 20.0% can be reduced devitrification due to excessive content of P 2 O 5 component. Therefore, the content of the P 2 O 5 component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
As the P 2 O 5 component, Al (PO 3 ) 3 , Ca (PO 3 ) 2 , Ba (PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like can be used as a raw material.
一方で、P2O5成分の含有量を20.0%以下にすることで、P2O5成分の過剰な含有による失透を低減できる。従って、P2O5成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
P2O5成分は、原料としてAl(PO3)3、Ca(PO3)2、Ba(PO3)2、BPO4、H3PO4等を用いることができる。 P 2 O 5 component is an optional component that enhances the stability of the glass by ultrasonic containing 0%.
On the other hand, when the content of P 2 O 5 component below 20.0% can be reduced devitrification due to excessive content of P 2 O 5 component. Therefore, the content of the P 2 O 5 component is preferably 20.0%, more preferably 10.0%, and still more preferably 5.0%.
As the P 2 O 5 component, Al (PO 3 ) 3 , Ca (PO 3 ) 2 , Ba (PO 3 ) 2 , BPO 4 , H 3 PO 4 or the like can be used as a raw material.
GeO2成分は、0%超含有することで、ガラスの屈折率を高め、ガラスを安定化させて成形時の失透を低減できる任意成分である。
一方で、GeO2成分の含有量を10.0%以下にすることで、高価なGeO2成分の使用量が低減されるため、ガラスの材料コストを低減できる。従って、GeO2成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
GeO2成分は、原料としてGeO2等を用いることができる。 The GeO 2 component is an optional component that can contain more than 0% to increase the refractive index of the glass, stabilize the glass, and reduce devitrification during molding.
On the other hand, when the content of GeO 2 component to 10.0% or less, since the amount of expensive GeO 2 component is reduced, thereby reducing the material cost of the glass. Accordingly, the content of the GeO 2 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the GeO 2 component, GeO 2 or the like can be used as a raw material.
一方で、GeO2成分の含有量を10.0%以下にすることで、高価なGeO2成分の使用量が低減されるため、ガラスの材料コストを低減できる。従って、GeO2成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
GeO2成分は、原料としてGeO2等を用いることができる。 The GeO 2 component is an optional component that can contain more than 0% to increase the refractive index of the glass, stabilize the glass, and reduce devitrification during molding.
On the other hand, when the content of GeO 2 component to 10.0% or less, since the amount of expensive GeO 2 component is reduced, thereby reducing the material cost of the glass. Accordingly, the content of the GeO 2 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the GeO 2 component, GeO 2 or the like can be used as a raw material.
Al2O3成分は、0%超含有することで、ガラスの化学的耐久性を高め、ガラスの耐失透性を向上できる任意成分である。
一方で、Al2O3成分の含有量を30.0%以下にすることで、Al2O3成分の過剰な含有による失透を低減できる。また、これにより再加熱時における失透や着色を低減できる。従って、Al2O3成分の含有量は、好ましくは30.0%、より好ましくは20.0%、さらに好ましくは10.0%を上限とする。
Al2O3成分は、原料としてAl2O3、Al(OH)3、AlF3等を用いることができる。 The Al 2 O 3 component is an optional component that can increase the chemical durability of the glass and improve the devitrification resistance of the glass by containing more than 0%.
On the other hand, by making the content of the Al 2 O 3 component below 30.0% can be reduced devitrification due to excessive content of Al 2 O 3 component. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Accordingly, the upper limit of the content of the Al 2 O 3 component is preferably 30.0%, more preferably 20.0%, and even more preferably 10.0%.
As the Al 2 O 3 component, Al 2 O 3 , Al (OH) 3 , AlF 3 or the like can be used as a raw material.
一方で、Al2O3成分の含有量を30.0%以下にすることで、Al2O3成分の過剰な含有による失透を低減できる。また、これにより再加熱時における失透や着色を低減できる。従って、Al2O3成分の含有量は、好ましくは30.0%、より好ましくは20.0%、さらに好ましくは10.0%を上限とする。
Al2O3成分は、原料としてAl2O3、Al(OH)3、AlF3等を用いることができる。 The Al 2 O 3 component is an optional component that can increase the chemical durability of the glass and improve the devitrification resistance of the glass by containing more than 0%.
On the other hand, by making the content of the Al 2 O 3 component below 30.0% can be reduced devitrification due to excessive content of Al 2 O 3 component. Moreover, devitrification and coloring at the time of reheating can be reduced thereby. Accordingly, the upper limit of the content of the Al 2 O 3 component is preferably 30.0%, more preferably 20.0%, and even more preferably 10.0%.
As the Al 2 O 3 component, Al 2 O 3 , Al (OH) 3 , AlF 3 or the like can be used as a raw material.
WO3成分は、0%超含有することで、ガラスの屈折率を高めてアッベ数を低くし、ガラスの耐失透性を高め、且つガラスの溶解性を高められる任意成分である。
一方で、WO3成分の含有量を20.0%以下にすることで、ガラスの部分分散比を上昇し難くでき、且つ、ガラスの着色を低減して内部透過率を高めることができる。従って、WO3成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは7.0%を上限とする。
WO3成分は、原料としてWO3等を用いることができる。 By containing more than 0%, the WO 3 component is an optional component that increases the refractive index of the glass, lowers the Abbe number, increases the devitrification resistance of the glass, and increases the solubility of the glass.
On the other hand, by setting the content of the WO 3 component to 20.0% or less, it is possible to make it difficult to increase the partial dispersion ratio of the glass, and it is possible to reduce the coloring of the glass and increase the internal transmittance. Accordingly, the upper limit of the content of the WO 3 component is preferably 20.0%, more preferably 10.0%, and even more preferably 7.0%.
As the WO 3 component, WO 3 or the like can be used as a raw material.
一方で、WO3成分の含有量を20.0%以下にすることで、ガラスの部分分散比を上昇し難くでき、且つ、ガラスの着色を低減して内部透過率を高めることができる。従って、WO3成分の含有量は、好ましくは20.0%、より好ましくは10.0%、さらに好ましくは7.0%を上限とする。
WO3成分は、原料としてWO3等を用いることができる。 By containing more than 0%, the WO 3 component is an optional component that increases the refractive index of the glass, lowers the Abbe number, increases the devitrification resistance of the glass, and increases the solubility of the glass.
On the other hand, by setting the content of the WO 3 component to 20.0% or less, it is possible to make it difficult to increase the partial dispersion ratio of the glass, and it is possible to reduce the coloring of the glass and increase the internal transmittance. Accordingly, the upper limit of the content of the WO 3 component is preferably 20.0%, more preferably 10.0%, and even more preferably 7.0%.
As the WO 3 component, WO 3 or the like can be used as a raw material.
Ta2O5成分は、0%超含有することで、ガラスの屈折率を高め、ガラスのアッベ数及び部分分散比を下げ、且つガラスの耐失透性を高められる任意成分である。
一方で、Ta2O5成分の含有量を15.0%以下にすることで、希少鉱物資源であるTa2O5成分の使用量が減り、且つガラスがより低温で溶解し易くなるため、ガラスの生産コストを低減できる。また、これによりTa2O5成分の過剰な含有によるガラスの失透を低減できる。従って、Ta2O5成分の含有量は、好ましくは15.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
Ta2O5成分は、原料としてTa2O5等を用いることができる。 The Ta 2 O 5 component is an optional component that increases the refractive index of the glass, lowers the Abbe number and partial dispersion ratio of the glass, and increases the devitrification resistance of the glass by containing more than 0%.
On the other hand, by making the content of Ta 2 O 5 component 15.0% or less, the amount of Ta 2 O 5 component, which is a rare mineral resource, is reduced, and the glass is easily melted at a lower temperature. Glass production costs can be reduced. Moreover, this can reduce the devitrification of the glass due to excessive inclusion of the Ta 2 O 5 component. Therefore, the content of the Ta 2 O 5 component is preferably 15.0%, more preferably 10.0%, and still more preferably 5.0%.
As the Ta 2 O 5 component, Ta 2 O 5 or the like can be used as a raw material.
一方で、Ta2O5成分の含有量を15.0%以下にすることで、希少鉱物資源であるTa2O5成分の使用量が減り、且つガラスがより低温で溶解し易くなるため、ガラスの生産コストを低減できる。また、これによりTa2O5成分の過剰な含有によるガラスの失透を低減できる。従って、Ta2O5成分の含有量は、好ましくは15.0%、より好ましくは10.0%、さらに好ましくは5.0%を上限とする。
Ta2O5成分は、原料としてTa2O5等を用いることができる。 The Ta 2 O 5 component is an optional component that increases the refractive index of the glass, lowers the Abbe number and partial dispersion ratio of the glass, and increases the devitrification resistance of the glass by containing more than 0%.
On the other hand, by making the content of Ta 2 O 5 component 15.0% or less, the amount of Ta 2 O 5 component, which is a rare mineral resource, is reduced, and the glass is easily melted at a lower temperature. Glass production costs can be reduced. Moreover, this can reduce the devitrification of the glass due to excessive inclusion of the Ta 2 O 5 component. Therefore, the content of the Ta 2 O 5 component is preferably 15.0%, more preferably 10.0%, and still more preferably 5.0%.
As the Ta 2 O 5 component, Ta 2 O 5 or the like can be used as a raw material.
Bi2O3成分は、0%超含有することで、ガラスの屈折率を高めてアッベ数を低くでき、且つガラス転移点を低くできる任意成分である。
一方で、Bi2O3成分の含有量を10.0%以下にすることで、ガラスの部分分散比を上昇し難くでき、且つ、ガラスの着色を低減して内部透過率を高めることができる。従って、Bi2O3成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
Bi2O3成分は、原料としてBi2O3等を用いることができる。 The Bi 2 O 3 component is an optional component that can contain more than 0% to increase the refractive index of the glass, lower the Abbe number, and lower the glass transition point.
On the other hand, by setting the content of the Bi 2 O 3 component to 10.0% or less, it is difficult to increase the partial dispersion ratio of the glass, and it is possible to reduce the coloring of the glass and increase the internal transmittance. . Therefore, the content of the Bi 2 O 3 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the Bi 2 O 3 component, Bi 2 O 3 or the like can be used as a raw material.
一方で、Bi2O3成分の含有量を10.0%以下にすることで、ガラスの部分分散比を上昇し難くでき、且つ、ガラスの着色を低減して内部透過率を高めることができる。従って、Bi2O3成分の含有量は、好ましくは10.0%、より好ましくは5.0%、さらに好ましくは3.0%を上限とする。
Bi2O3成分は、原料としてBi2O3等を用いることができる。 The Bi 2 O 3 component is an optional component that can contain more than 0% to increase the refractive index of the glass, lower the Abbe number, and lower the glass transition point.
On the other hand, by setting the content of the Bi 2 O 3 component to 10.0% or less, it is difficult to increase the partial dispersion ratio of the glass, and it is possible to reduce the coloring of the glass and increase the internal transmittance. . Therefore, the content of the Bi 2 O 3 component is preferably 10.0%, more preferably 5.0%, and still more preferably 3.0%.
As the Bi 2 O 3 component, Bi 2 O 3 or the like can be used as a raw material.
TeO2成分は、0%超含有することで、ガラスの屈折率を上げ、ガラスの部分分散比を低くでき、且つガラス転移点を低くできる任意成分である。
一方で、TeO2成分の含有量を30.0%以下にすることで、ガラスの着色を低減して内部透過率を高めることができる。また、高価なTeO2成分の使用を低減することで、より材料コストの安いガラスを得られる。従って、TeO2成分の含有量は、好ましくは30.0%、より好ましくは20.0%、さらに好ましくは10.0%を上限とする。
TeO2成分は、原料としてTeO2等を用いることができる。 The TeO 2 component is an optional component that can increase the refractive index of the glass, lower the partial dispersion ratio of the glass, and lower the glass transition point by containing more than 0%.
On the other hand, by setting the content of the TeO 2 component to 30.0% or less, the coloring of the glass can be reduced and the internal transmittance can be increased. Moreover, glass with lower material costs can be obtained by reducing the use of expensive TeO 2 components. Therefore, the content of the TeO 2 component is preferably 30.0%, more preferably 20.0%, and still more preferably 10.0%.
TeO 2 component can use TeO 2 or the like as a raw material.
一方で、TeO2成分の含有量を30.0%以下にすることで、ガラスの着色を低減して内部透過率を高めることができる。また、高価なTeO2成分の使用を低減することで、より材料コストの安いガラスを得られる。従って、TeO2成分の含有量は、好ましくは30.0%、より好ましくは20.0%、さらに好ましくは10.0%を上限とする。
TeO2成分は、原料としてTeO2等を用いることができる。 The TeO 2 component is an optional component that can increase the refractive index of the glass, lower the partial dispersion ratio of the glass, and lower the glass transition point by containing more than 0%.
On the other hand, by setting the content of the TeO 2 component to 30.0% or less, the coloring of the glass can be reduced and the internal transmittance can be increased. Moreover, glass with lower material costs can be obtained by reducing the use of expensive TeO 2 components. Therefore, the content of the TeO 2 component is preferably 30.0%, more preferably 20.0%, and still more preferably 10.0%.
TeO 2 component can use TeO 2 or the like as a raw material.
Sb2O3成分は、0%超含有することで、ガラスの脱泡を促進し、ガラスを清澄できる任意成分である。
一方で、Sb2O3成分の含有量を3.0%以下にすることで、ガラス溶融時における過度の発泡を生じ難くすることができ、Sb2O3成分が溶解設備(特にPt等の貴金属)と合金化し難くできる。従って、Sb2O3成分の含有量は、好ましくは3.0%、より好ましくは2.0%、さらに好ましくは1.0%、さらに好ましくは0.5%を上限とする。但し、光学ガラスの環境上の影響を重視する場合には、Sb2O3成分を含有しなくてもよい。
Sb2O3成分は、原料としてSb2O3、Sb2O5、Na2H2Sb2O7・5H2O等を用いることができる。 The Sb 2 O 3 component is an optional component capable of promoting the defoaming of the glass and clarifying the glass by containing more than 0%.
On the other hand, by setting the content of the Sb 2 O 3 component to 3.0% or less, excessive foaming at the time of glass melting can be made difficult, and the Sb 2 O 3 component can be dissolved in a melting facility (particularly Pt or the like). It can be difficult to alloy with noble metals. Accordingly, the content of the Sb 2 O 3 component is preferably 3.0%, more preferably 2.0%, still more preferably 1.0%, and still more preferably 0.5%. However, the Sb 2 O 3 component does not have to be contained when the environmental impact of the optical glass is emphasized.
As the Sb 2 O 3 component, Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 .5H 2 O, or the like can be used as a raw material.
一方で、Sb2O3成分の含有量を3.0%以下にすることで、ガラス溶融時における過度の発泡を生じ難くすることができ、Sb2O3成分が溶解設備(特にPt等の貴金属)と合金化し難くできる。従って、Sb2O3成分の含有量は、好ましくは3.0%、より好ましくは2.0%、さらに好ましくは1.0%、さらに好ましくは0.5%を上限とする。但し、光学ガラスの環境上の影響を重視する場合には、Sb2O3成分を含有しなくてもよい。
Sb2O3成分は、原料としてSb2O3、Sb2O5、Na2H2Sb2O7・5H2O等を用いることができる。 The Sb 2 O 3 component is an optional component capable of promoting the defoaming of the glass and clarifying the glass by containing more than 0%.
On the other hand, by setting the content of the Sb 2 O 3 component to 3.0% or less, excessive foaming at the time of glass melting can be made difficult, and the Sb 2 O 3 component can be dissolved in a melting facility (particularly Pt or the like). It can be difficult to alloy with noble metals. Accordingly, the content of the Sb 2 O 3 component is preferably 3.0%, more preferably 2.0%, still more preferably 1.0%, and still more preferably 0.5%. However, the Sb 2 O 3 component does not have to be contained when the environmental impact of the optical glass is emphasized.
As the Sb 2 O 3 component, Sb 2 O 3 , Sb 2 O 5 , Na 2 H 2 Sb 2 O 7 .5H 2 O, or the like can be used as a raw material.
なお、ガラスを清澄し脱泡する成分は、上記のSb2O3成分に限定されるものではなく、ガラス製造の分野における公知の清澄剤や脱泡剤、或いはそれらの組み合わせを用いることができる。
Incidentally, components of the fining defoaming of glass is not limited to the above Sb 2 O 3 ingredients may be used known refining agents and defoamers in the field of glass production, or a combination thereof .
<含有すべきでない成分について>
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。 <About ingredients that should not be included>
Next, components that should not be contained in the optical glass of the present invention and components that are not preferably contained will be described.
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。 <About ingredients that should not be included>
Next, components that should not be contained in the optical glass of the present invention and components that are not preferably contained will be described.
他の成分を本願発明のガラスの特性を損なわない範囲で必要に応じ、添加できる。ただし、Ti、Zr、Nb、W、La、Gd、Y、Yb、Luを除く、V、Cr、Mn、Fe、Co、Ni、Cu、Ag及びMo等の各遷移金属成分は、それぞれを単独又は複合して少量含有した場合でもガラスが着色し、可視域の特定の波長に吸収を生じる性質があるため、特に可視領域の波長を使用する光学ガラスにおいては、実質的に含まないことが好ましい。
Other components can be added as needed within the range not impairing the properties of the glass of the present invention. However, each transition metal component such as V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Mo, excluding Ti, Zr, Nb, W, La, Gd, Y, Yb, and Lu, is independent of each other. Or, even when it is contained in a small amount in combination, the glass is colored and has the property of causing absorption at a specific wavelength in the visible range. .
また、PbO等の鉛化合物及びAs2O3等の砒素化合物は、環境負荷が高い成分であるため、実質的に含有しないこと、すなわち、不可避な混入を除いて一切含有しないことが望ましい。
Moreover, since lead compounds such as PbO and arsenic compounds such as As 2 O 3 are components with high environmental loads, it is desirable that they are not substantially contained, that is, not contained at all except for inevitable mixing.
さらに、Th、Cd、Tl、Os、Be、及びSeの各成分は、近年有害な化学物資として使用を控える傾向にあり、ガラスの製造工程のみならず、加工工程、及び製品化後の処分に至るまで環境対策上の措置が必要とされる。従って、環境上の影響を重視する場合には、これらを実質的に含有しないことが好ましい。
Furthermore, each component of Th, Cd, Tl, Os, Be, and Se has tended to be refrained from being used as a harmful chemical material in recent years, and not only in the glass manufacturing process, but also in the processing process and disposal after commercialization. Until then, environmental measures are required. Therefore, when importance is placed on the environmental impact, it is preferable that these are not substantially contained.
本発明のガラス組成物は、その組成が酸化物換算組成のガラス全質量に対する質量%で表されているため直接的にモル%の記載に表せるものではないが、本発明において要求される諸特性を満たすガラス組成物中に存在する各成分のモル%表示による組成は、酸化物換算組成で概ね以下の値をとる。
SiO2成分 10.0~60.0モル%、
CaO成分 20.0~55.0モル%及び
Nb2O5成分 10.0~30.0モル%
並びに
ZrO2成分 0~15.0モル%
TiO2成分 0~20.0モル%
BaO成分 0~25.0モル%
MgO成分 0~40.0モル%
SrO成分 0~20.0モル%
ZnO成分 0~20.0モル%
B2O3成分 0~30.0モル%
Li2O成分 0~40.0モル%
Na2O成分 0~30.0モル%
K2O成分 0~20.0モル%
Cs2O成分 0~10.0モル%
Y2O3成分 0~20.0モル%
La2O3成分 0~15.0モル%
Gd2O3成分 0~15.0モル%
Yb2O3成分 0~15.0モル%
P2O5成分 0~20.0モル%
GeO2成分 0~10.0モル%
Al2O3成分 0~30.0モル%
WO3成分 0~20.0モル%
Ta2O5成分 0~15.0モル%
Bi2O3成分 0~15.0モル%
TeO2成分 0~30.0モル%
Sb2O3成分 0~3.0モル% The glass composition of the present invention cannot be expressed directly in the description of mol% because the composition is expressed by mass% with respect to the total mass of the glass of oxide conversion composition, but various properties required in the present invention. The composition expressed by mol% of each component present in the glass composition satisfying the above conditions generally takes the following values in terms of oxide conversion.
SiO 2 component 10.0-60.0 mol%,
CaO component 20.0-55.0 mol% and Nb 2 O 5 component 10.0-30.0 mol%
ZrO 2 component 0-15.0 mol%
TiO 2 component 0-20.0 mol%
BaO component 0-25.0 mol%
MgO component 0-40.0 mol%
SrO component 0-20.0 mol%
ZnO component 0-20.0 mol%
B 2 O 3 component 0-30.0 mol%
Li 2 O component 0-40.0 mol%
Na 2 O component 0-30.0 mol%
K 2 O component 0-20.0 mol%
Cs 2 O component 0 to 10.0 mol%
Y 2 O 3 component 0-20.0 mol%
La 2 O 3 component 0-15.0 mol%
Gd 2 O 3 component 0 to 15.0 mol%
Yb 2 O 3 component 0 to 15.0 mol%
P 2 O 5 component 0-20.0 mol%
GeO 2 component 0-10.0 mol%
Al 2 O 3 component 0-30.0 mol%
WO 3 component 0-20.0 mol%
Ta 2 O 5 component 0-15.0 mol%
Bi 2 O 3 component 0 to 15.0 mol%
TeO 2 component 0-30.0 mol%
Sb 2 O 3 component 0 to 3.0 mol%
SiO2成分 10.0~60.0モル%、
CaO成分 20.0~55.0モル%及び
Nb2O5成分 10.0~30.0モル%
並びに
ZrO2成分 0~15.0モル%
TiO2成分 0~20.0モル%
BaO成分 0~25.0モル%
MgO成分 0~40.0モル%
SrO成分 0~20.0モル%
ZnO成分 0~20.0モル%
B2O3成分 0~30.0モル%
Li2O成分 0~40.0モル%
Na2O成分 0~30.0モル%
K2O成分 0~20.0モル%
Cs2O成分 0~10.0モル%
Y2O3成分 0~20.0モル%
La2O3成分 0~15.0モル%
Gd2O3成分 0~15.0モル%
Yb2O3成分 0~15.0モル%
P2O5成分 0~20.0モル%
GeO2成分 0~10.0モル%
Al2O3成分 0~30.0モル%
WO3成分 0~20.0モル%
Ta2O5成分 0~15.0モル%
Bi2O3成分 0~15.0モル%
TeO2成分 0~30.0モル%
Sb2O3成分 0~3.0モル% The glass composition of the present invention cannot be expressed directly in the description of mol% because the composition is expressed by mass% with respect to the total mass of the glass of oxide conversion composition, but various properties required in the present invention. The composition expressed by mol% of each component present in the glass composition satisfying the above conditions generally takes the following values in terms of oxide conversion.
SiO 2 component 10.0-60.0 mol%,
CaO component 20.0-55.0 mol% and Nb 2 O 5 component 10.0-30.0 mol%
ZrO 2 component 0-15.0 mol%
TiO 2 component 0-20.0 mol%
BaO component 0-25.0 mol%
MgO component 0-40.0 mol%
SrO component 0-20.0 mol%
ZnO component 0-20.0 mol%
B 2 O 3 component 0-30.0 mol%
Li 2 O component 0-40.0 mol%
Na 2 O component 0-30.0 mol%
K 2 O component 0-20.0 mol%
Cs 2 O component 0 to 10.0 mol%
Y 2 O 3 component 0-20.0 mol%
La 2 O 3 component 0-15.0 mol%
Gd 2 O 3 component 0 to 15.0 mol%
Yb 2 O 3 component 0 to 15.0 mol%
P 2 O 5 component 0-20.0 mol%
GeO 2 component 0-10.0 mol%
Al 2 O 3 component 0-30.0 mol%
WO 3 component 0-20.0 mol%
Ta 2 O 5 component 0-15.0 mol%
Bi 2 O 3 component 0 to 15.0 mol%
TeO 2 component 0-30.0 mol%
Sb 2 O 3 component 0 to 3.0 mol%
[製造方法]
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量の範囲内になるように均一に混合し、作製した混合物を白金坩堝、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1100~1400℃の温度範囲で3~5時間溶融し、攪拌均質化して泡切れ等を行った後、1000~1400℃の温度に下げてから仕上げ攪拌を行って脈理を除去し、金型に鋳込んで徐冷することにより作製される。 [Production method]
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 platinum crucible, a quartz crucible or an alumina crucible and roughly melted, then a gold crucible, a platinum crucible In a platinum alloy crucible or iridium crucible, melt in a temperature range of 1100 to 1400 ° C. for 3 to 5 hours, stir and homogenize to blow out bubbles, etc., then lower the temperature to 1000 to 1400 ° C. and then finish stirring This is done by removing the striae, casting into a mold and slow cooling.
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量の範囲内になるように均一に混合し、作製した混合物を白金坩堝、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1100~1400℃の温度範囲で3~5時間溶融し、攪拌均質化して泡切れ等を行った後、1000~1400℃の温度に下げてから仕上げ攪拌を行って脈理を除去し、金型に鋳込んで徐冷することにより作製される。 [Production method]
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 platinum crucible, a quartz crucible or an alumina crucible and roughly melted, then a gold crucible, a platinum crucible In a platinum alloy crucible or iridium crucible, melt in a temperature range of 1100 to 1400 ° C. for 3 to 5 hours, stir and homogenize to blow out bubbles, etc., then lower the temperature to 1000 to 1400 ° C. and then finish stirring This is done by removing the striae, casting into a mold and slow cooling.
<物性>
本発明の光学ガラスは、所定の屈折率及び分散(アッベ数)を有することが好ましい。より具体的には、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1.74、さらに好ましくは1.78、さらに好ましくは1.82を下限とする。一方、本発明の光学ガラスの屈折率(nd)の上限は特に限定されないが、好ましくは2.20、より好ましくは2.10、さらに好ましくは2.00、さらに好ましくは1.90であってもよい。また、本発明の光学ガラスのアッベ数(νd)は、好ましくは35、より好ましくは34、さらに好ましくは33を上限とする。一方、本発明の光学ガラスのアッベ数(νd)の下限は特に限定されないが、好ましくは25、より好ましくは26、さらに好ましくは27であってもよい。これらにより、光学設計の自由度が広がり、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。 <Physical properties>
The optical glass of the present invention preferably has a predetermined refractive index and dispersion (Abbe number). More specifically, the refractive index (n d ) of the optical glass of the present invention is preferably 1.70, more preferably 1.74, still more preferably 1.78, and still more preferably 1.82. . On the other hand, the upper limit of the refractive index (n d ) of the optical glass of the present invention is not particularly limited, but is preferably 2.20, more preferably 2.10, still more preferably 2.00, and still more preferably 1.90. May be. Moreover, the Abbe number (ν d ) of the optical glass of the present invention is preferably 35, more preferably 34, and still more preferably 33. On the other hand, the lower limit of the Abbe number (ν d ) of the optical glass of the present invention is not particularly limited, but may be preferably 25, more preferably 26, and even more preferably 27. As a result, the degree of freedom in optical design is increased, and a large amount of light refraction can be obtained even if the device is made thinner.
本発明の光学ガラスは、所定の屈折率及び分散(アッベ数)を有することが好ましい。より具体的には、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1.74、さらに好ましくは1.78、さらに好ましくは1.82を下限とする。一方、本発明の光学ガラスの屈折率(nd)の上限は特に限定されないが、好ましくは2.20、より好ましくは2.10、さらに好ましくは2.00、さらに好ましくは1.90であってもよい。また、本発明の光学ガラスのアッベ数(νd)は、好ましくは35、より好ましくは34、さらに好ましくは33を上限とする。一方、本発明の光学ガラスのアッベ数(νd)の下限は特に限定されないが、好ましくは25、より好ましくは26、さらに好ましくは27であってもよい。これらにより、光学設計の自由度が広がり、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。 <Physical properties>
The optical glass of the present invention preferably has a predetermined refractive index and dispersion (Abbe number). More specifically, the refractive index (n d ) of the optical glass of the present invention is preferably 1.70, more preferably 1.74, still more preferably 1.78, and still more preferably 1.82. . On the other hand, the upper limit of the refractive index (n d ) of the optical glass of the present invention is not particularly limited, but is preferably 2.20, more preferably 2.10, still more preferably 2.00, and still more preferably 1.90. May be. Moreover, the Abbe number (ν d ) of the optical glass of the present invention is preferably 35, more preferably 34, and still more preferably 33. On the other hand, the lower limit of the Abbe number (ν d ) of the optical glass of the present invention is not particularly limited, but may be preferably 25, more preferably 26, and even more preferably 27. As a result, the degree of freedom in optical design is increased, and a large amount of light refraction can be obtained even if the device is made thinner.
また、本発明の光学ガラスは、低い部分分散比(θg,F)を有する。より具体的には、本発明の光学ガラスの部分分散比(θg,F)は、アッベ数(νd)との間で、νd≦31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00275×νd+0.68125)の関係を満たし、且つ、νd>31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00162×νd+0.64622)の関係を満たす。これにより、ノーマルラインに近付けられた部分分散比(θg,F)を有する光学ガラスが得られるため、この光学ガラスから形成される光学素子の色収差を低減できる。ここで、νd≦31における光学ガラスの部分分散比(θg,F)の下限は、好ましくは(-0.00162×νd+0.63822)、より好ましくは(-0.00162×νd+0.63922)、さらに好ましくは(-0.00162×νd+0.64022)である。一方で、νd≦31における光学ガラスの部分分散比(θg,F)の上限は、好ましくは(-0.00275×νd+0.68125)、より好ましくは(-0.00275×νd+0.68025)、さらに好ましくは(-0.00275×νd+0.67925)である。また、νd>31における光学ガラスの部分分散比(θg,F)の下限は、好ましくは(-0.00162×νd+0.63822)、より好ましくは(-0.00162×νd+0.63922)、さらに好ましくは(-0.00162×νd+0.64022)である。一方で、νd>31における光学ガラスの部分分散比(θg,F)の上限は、好ましくは(-0.00162×νd+0.64622)、より好ましくは(-0.00162×νd+0.64522)、さらに好ましくは(-0.00162×νd+0.64422)である。なお、特にアッベ数(νd)が小さい領域では、一般的なガラスの部分分散比(θg,F)はノーマルラインよりも高い値にあり、一般的なガラスの部分分散比(θg,F)とアッベ数(νd)の関係は曲線で表される。しかしながら、この曲線の近似が困難であるため、本発明では、一般的なガラスよりも部分分散比(θg,F)が低いことを、νd=31を境に異なった傾きを有する直線を用いて表した。
Moreover, the optical glass of the present invention has a low partial dispersion ratio (θg, F). More specifically, the partial dispersion ratio (θg, F) of the optical glass of the present invention is within the range of ν d ≦ 31 with respect to the Abbe number (ν d ) (−0.00162 × νd + 0.63822). ≦ (θg, F) ≦ (−0.00275 × νd + 0.68125) is satisfied, and (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (− in the range of ν d > 31 0.00162 × νd + 0.64622). As a result, an optical glass having a partial dispersion ratio (θg, F) close to the normal line can be obtained, so that chromatic aberration of an optical element formed from the optical glass can be reduced. Here, the lower limit of the partial dispersion ratio (θg, F) of the optical glass at ν d ≦ 31 is preferably (−0.00162 × νd + 0.63822), more preferably (−0.00162 × νd + 0.63922), More preferably (−0.00162 × νd + 0.64022). On the other hand, the upper limit of the partial dispersion ratio (θg, F) of the optical glass at ν d ≦ 31 is preferably (−0.00275 × νd + 0.68125), more preferably (−0.00275 × νd + 0.68025), More preferably (−0.00275 × νd + 0.67925). Further, the lower limit of the partial dispersion ratio (θg, F) of the optical glass at ν d > 31 is preferably (−0.00162 × νd + 0.63822), more preferably (−0.00162 × νd + 0.63922), Preferably, it is (−0.00162 × νd + 0.64022). On the other hand, the upper limit of the partial dispersion ratio (θg, F) of the optical glass at ν d > 31 is preferably (−0.00162 × νd + 0.64622), more preferably (−0.00162 × νd + 0.64522). More preferably, it is (−0.00162 × νd + 0.64422). In particular, in a region where the Abbe number (ν d ) is small, the partial dispersion ratio (θg, F) of general glass is higher than that of the normal line, and the partial dispersion ratio (θg, F) of general glass is high. And the Abbe number (ν d ) are represented by curves. However, since it is difficult to approximate this curve, the present invention uses a straight line having a different slope from ν d = 31 as a partial dispersion ratio (θg, F) lower than that of general glass. Expressed.
また、本発明の光学ガラスは、着色が少ないことが好ましい。特に、本発明の光学ガラスは、ガラスの透過率で表すと、厚み10mmのサンプルで分光透過率70%を示す波長(λ70)が好ましくは450nm以下であり、より好ましくは430nm以下であり、さらに好ましくは410nm以下である。また、本発明の光学ガラスは、厚み10mmのサンプルで分光透過率5%を示す波長(λ5)が好ましくは400nm以下であり、より好ましくは380nm以下であり、さらに好ましくは360nm以下である。これにより、ガラスの吸収端が紫外領域の近傍に位置するようになり、可視域におけるガラスの透明性が高められるため、この光学ガラスをレンズ等の光学素子の材料として好ましく用いることができる。
Moreover, it is preferable that the optical glass of this invention has little coloring. In particular, when the optical glass of the present invention is represented by the transmittance of the glass, the wavelength (λ 70 ) showing a spectral transmittance of 70% in a sample having a thickness of 10 mm is preferably 450 nm or less, more preferably 430 nm or less, More preferably, it is 410 nm or less. In the optical glass of the present invention, a wavelength (λ 5 ) showing a spectral transmittance of 5% in a sample having a thickness of 10 mm is preferably 400 nm or less, more preferably 380 nm or less, and further preferably 360 nm or less. Thereby, the absorption edge of the glass is positioned in the vicinity of the ultraviolet region, and the transparency of the glass in the visible region is enhanced. Therefore, this optical glass can be preferably used as a material for an optical element such as a lens.
また、本発明の光学ガラスは、プレス成形性が良好であることが好ましい。すなわち、本発明の光学ガラスは、再加熱試験(イ)後の試験片の波長587.56nmの光線(d線)の透過率を、再加熱試験前の試験片のd線の透過率で除した値が、0.95以上であることが好ましい。また、再加熱試験(イ)前の試験片の透過率が70%となる波長であるλ70と、再加熱試験後の試験片のλ70との差が20nm以下であることが好ましい。これにより、リヒートプレス加工を想定した再加熱試験によっても失透及び着色が起こり難くなることで、ガラスの光線透過率が失われ難くなるため、ガラスに対してリヒートプレス加工に代表される再加熱処理を行い易くできる。すなわち、複雑な形状の光学素子をプレス成形で作製できるため、製造コストが安く、且つ生産性の良い光学素子製造を実現できる。
The optical glass of the present invention preferably has good press formability. That is, the optical glass of the present invention divides the transmittance of light (d-line) having a wavelength of 587.56 nm of the test piece after the reheating test (ii) by the transmittance of d-line of the test piece before the reheating test. The measured value is preferably 0.95 or more. Also, a lambda 70 is a wavelength at which the transmittance of the reheating test (a) before the specimen is 70% and the difference between the lambda 70 of the test piece after the reheating test is 20nm or less. This makes it difficult for devitrification and coloring to occur even in a reheating test assuming reheat press processing, so that the light transmittance of the glass is less likely to be lost. Processing can be facilitated. That is, since an optical element having a complicated shape can be produced by press molding, it is possible to realize optical element production with low manufacturing cost and high productivity.
ここで、再加熱試験(イ)後の試験片の波長587.56nmの光線(d線)の透過率を、再加熱試験(イ)前の試験片のd線の透過率で除した値は、好ましくは0.95、より好ましくは0.96、さらに好ましくは0.97を下限とする。また、再加熱試験(イ)前の試験片のλ70と再加熱試験(イ)後の試験片のλ70との差は、好ましくは20nm、より好ましくは18nm、さらに好ましくは16nmを上限とする。
Here, the value obtained by dividing the transmittance of the light beam (d-line) having a wavelength of 587.56 nm of the test piece after the reheating test (ii) by the transmittance of the d-line of the test piece before the reheating test (ii) is The lower limit is preferably 0.95, more preferably 0.96, and still more preferably 0.97. Further, the difference between the lambda 70 of the test piece after the reheating test and lambda 70 of reheating test (a) prior to the test piece (b) is preferably 20 nm, more preferably 18 nm, more preferably the upper limit of the 16nm To do.
なお、再加熱試験(イ)は、試験片15mm×15mm×30mmを再加熱し、室温から150分で各試料の転移温度(Tg)より80℃高い温度まで昇温し、前記光学ガラスのガラス転移温度(Tg)よりも80℃高い温度で30分間保温し、その後常温まで自然冷却し、試験片の対向する2面を厚み10mmに研磨した後に目視観察することにより行うことができる。
In the reheating test (A), a test piece 15 mm × 15 mm × 30 mm is reheated, and the temperature is raised from room temperature to a temperature 80 ° C. higher than the transition temperature (Tg) of each sample in 150 minutes. The temperature can be kept at 30 ° C. higher than the transition temperature (Tg) for 30 minutes, then naturally cooled to room temperature, and the two opposing surfaces of the test piece are polished to a thickness of 10 mm and visually observed.
[プリフォーム及び光学素子]
作製された光学ガラスから、例えばリヒートプレス成形や精密プレス成形等のモールドプレス成形の手段を用いて、ガラス成形体を作製できる。すなわち、光学ガラスからモールドプレス成形用のプリフォームを作製し、このプリフォームに対してリヒートプレス成形を行った後で研磨加工を行ってガラス成形体を作製したり、例えば研磨加工を行って作製したプリフォームに対して精密プレス成形を行ってガラス成形体を作製したりできる。なお、ガラス成形体を作製する手段は、これらの手段に限定されない。 [Preforms and optical elements]
A glass molded body can be produced from the produced optical glass by means of mold press molding such as reheat press molding or precision press molding. That is, a preform for mold press molding is prepared from optical glass, and after performing reheat press molding on the preform, polishing is performed to prepare a glass molded body, or for example, polishing is performed. The preform can be precision press-molded to produce a glass molded body. In addition, the means for producing the glass molded body is not limited to these means.
作製された光学ガラスから、例えばリヒートプレス成形や精密プレス成形等のモールドプレス成形の手段を用いて、ガラス成形体を作製できる。すなわち、光学ガラスからモールドプレス成形用のプリフォームを作製し、このプリフォームに対してリヒートプレス成形を行った後で研磨加工を行ってガラス成形体を作製したり、例えば研磨加工を行って作製したプリフォームに対して精密プレス成形を行ってガラス成形体を作製したりできる。なお、ガラス成形体を作製する手段は、これらの手段に限定されない。 [Preforms and optical elements]
A glass molded body can be produced from the produced optical glass by means of mold press molding such as reheat press molding or precision press molding. That is, a preform for mold press molding is prepared from optical glass, and after performing reheat press molding on the preform, polishing is performed to prepare a glass molded body, or for example, polishing is performed. The preform can be precision press-molded to produce a glass molded body. In addition, the means for producing the glass molded body is not limited to these means.
このようにして作製されるガラス成形体は、様々な光学素子に有用であるが、その中でも特に、レンズやプリズム等の光学素子の用途に用いることが好ましい。これにより、光学素子が設けられる光学系の透過光における、色収差による色のにじみが低減される。そのため、この光学素子をカメラに用いた場合は撮影対象物をより正確に表現でき、この光学素子をプロジェクタに用いた場合は所望の映像をより高精彩に投影できる。
The glass molded body produced in this way is useful for various optical elements, and among them, it is particularly preferable to use for optical elements such as lenses and prisms. As a result, color bleeding due to chromatic aberration in the transmitted light of the optical system provided with the optical element is reduced. Therefore, when this optical element is used in a camera, a photographing object can be expressed more accurately, and when this optical element is used in a projector, a desired image can be projected with higher definition.
本発明の実施例(No.1~No.90)及び比較例(No.A~No.C)の組成、並びに、屈折率(nd)、アッベ数(νd)、部分分散比(θg,F)、分光透過率が5%及び70%及び80%を示す波長(λ5、λ70)を表1~表12に示す。なお、以下の実施例はあくまで例示の目的であり、これらの実施例のみ限定されるものではない。
Composition of Examples (No. 1 to No. 90) and Comparative Examples (No. A to No. C) of the present invention, refractive index (n d ), Abbe number (ν d ), partial dispersion ratio (θg , F), and wavelengths (λ 5 , λ 70 ) with spectral transmittances of 5%, 70%, and 80% are shown in Tables 1 to 12. The following examples are merely for illustrative purposes, and are not limited to these examples.
本発明の実施例及び比較例のガラスは、いずれも各成分の原料として各々相当する酸化物、水酸化物、炭酸塩、硝酸塩、弗化物、水酸化物、メタ燐酸化合物等の通常の光学ガラスに使用される高純度の原料を選定し、表に示した各実施例及び比較例の組成の割合になるように秤量して均一に混合した後、白金坩堝に投入し、ガラス組成の熔融難易度に応じて電気炉で1100~1400℃の温度範囲で3~5時間溶解し、攪拌均質化して泡切れ等を行った後、1000~1400℃に温度を下げて攪拌均質化してから金型に鋳込み、徐冷してガラスを作製した。
The glasses of the examples and comparative examples of the present invention are ordinary optical glasses such as oxides, hydroxides, carbonates, nitrates, fluorides, hydroxides, and metaphosphate compounds corresponding to the raw materials of the respective components. After selecting the high-purity raw materials to be used in the above, weighing them so as to have the composition ratios of the examples and comparative examples shown in the table, mixing them uniformly, and then putting them into a platinum crucible, making it easy to melt the glass composition Depending on the temperature, melt in a temperature range of 1100 to 1400 ° C for 3 to 5 hours in an electric furnace, stir and homogenize to remove bubbles, then lower the temperature to 1000 to 1400 ° C and stir and homogenize the mold The glass was produced by casting and slowly cooling.
ここで、実施例及び比較例のガラスの屈折率(nd)、アッベ数(νd)及び部分分散比(θg,F)は、日本光学硝子工業会規格JOGIS01―2003に基づいて測定した。そして、求められたアッベ数(νd)及び部分分散比(θg,F)の値について、関係式(θg,F)=-a×νd+bにおける、傾きaが0.00162及び0.00275のときの切片bを求めた。なお、本測定に用いたガラスは、徐冷降温速度を-25℃/hrとして、徐冷炉にて処理を行ったものを用いた。
Here, the refractive index (n d ), Abbe number (ν d ), and partial dispersion ratio (θg, F) of the glasses of Examples and Comparative Examples were measured based on Japan Optical Glass Industry Association Standard JOGIS01-2003. Then, with respect to the obtained Abbe number (ν d ) and partial dispersion ratio (θg, F), the slope a in the relational expression (θg, F) = − a × ν d + b is 0.00162 and 0.00275. The intercept b at that time was determined. The glass used in this measurement was a glass that had been treated in a slow cooling furnace at a slow cooling rate of −25 ° C./hr.
また、実施例及び比較例のガラスの透過率は、日本光学硝子工業会規格JOGIS02に準じて測定した。なお、本発明においては、ガラスの透過率を測定することで、ガラスの着色の有無と程度を求めた。具体的には、厚さ10±0.1mmの対面平行研磨品をJISZ8722に準じ、200~800nmの分光透過率を測定し、λ5(透過率5%時の波長)及びλ70(透過率70%時の波長)を求めた。
Moreover, the transmittance | permeability of the glass of an Example and a comparative example was measured according to Japan Optical Glass Industry Association standard JOGIS02. In the present invention, the presence / absence and degree of coloration of the glass were determined by measuring the transmittance of the glass. Specifically, a face parallel polished product having a thickness of 10 ± 0.1 mm was measured for a spectral transmittance of 200 to 800 nm in accordance with JISZ8722, and λ 5 (wavelength when the transmittance was 5%) and λ 70 (transmittance). Wavelength at 70%).
本発明の実施例の光学ガラスは、νd≦31のものは部分分散比(θg,F)が(-0.00275×νd+0.68125)以下、より詳細には(-0.00275×νd+0.67850)以下であった。また、νd>31のものは、部分分散比(θg,F)が(-0.00162×νd+0.64622)以下、より詳細には(-0.00162×νd+0.64302)以下であった。その反面で、本発明の実施例の光学ガラスは、部分分散比(θg,F)が(-0.00162×νd+0.63822)以上、より詳細には(-0.00162×νd+0.63972)以上であった。すなわち、本願の実施例のガラスについての部分分散比(θg,F)とアッベ数(νd)の関係は、図2に示されるようになった。そのため、これらの部分分散比(θg,F)が所望の範囲内にあることがわかった。
一方、本発明の比較例(No.A~No.C)のガラスは、いずれもνd>31であり、且つ部分分散比(θg,F)が(-0.00162×νd+0.64622)を超えていた。従って、本発明の実施例の光学ガラスは、比較例のガラスに比べ、アッベ数(νd)との関係式において部分分散比(θg,F)が小さいことが明らかになった。 The optical glass of the example of the present invention has a partial dispersion ratio (θg, F) of (−0.00275 × νd + 0.68125) or less when ν d ≦ 31, more specifically (−0.00275 × νd + 0. 67850) or less. In the case of ν d > 31, the partial dispersion ratio (θg, F) was (−0.00162 × νd + 0.64622) or less, more specifically, (−0.00162 × νd + 0.64302) or less. On the other hand, the optical glass of the example of the present invention has a partial dispersion ratio (θg, F) of (−0.00162 × νd + 0.63822) or more, more specifically (−0.00162 × νd + 0.63972) or more. Met. That is, the relationship between the partial dispersion ratio (θg, F) and the Abbe number (ν d ) for the glass of the example of the present application is as shown in FIG. Therefore, it was found that these partial dispersion ratios (θg, F) are within a desired range.
On the other hand, the glasses of the comparative examples (No. A to No. C) of the present invention all have ν d > 31 and the partial dispersion ratio (θg, F) is (−0.00162 × νd + 0.64622). It was over. Therefore, it was clarified that the optical glass of the example of the present invention has a smaller partial dispersion ratio (θg, F) in the relational expression with the Abbe number (ν d ) than the glass of the comparative example.
一方、本発明の比較例(No.A~No.C)のガラスは、いずれもνd>31であり、且つ部分分散比(θg,F)が(-0.00162×νd+0.64622)を超えていた。従って、本発明の実施例の光学ガラスは、比較例のガラスに比べ、アッベ数(νd)との関係式において部分分散比(θg,F)が小さいことが明らかになった。 The optical glass of the example of the present invention has a partial dispersion ratio (θg, F) of (−0.00275 × νd + 0.68125) or less when ν d ≦ 31, more specifically (−0.00275 × νd + 0. 67850) or less. In the case of ν d > 31, the partial dispersion ratio (θg, F) was (−0.00162 × νd + 0.64622) or less, more specifically, (−0.00162 × νd + 0.64302) or less. On the other hand, the optical glass of the example of the present invention has a partial dispersion ratio (θg, F) of (−0.00162 × νd + 0.63822) or more, more specifically (−0.00162 × νd + 0.63972) or more. Met. That is, the relationship between the partial dispersion ratio (θg, F) and the Abbe number (ν d ) for the glass of the example of the present application is as shown in FIG. Therefore, it was found that these partial dispersion ratios (θg, F) are within a desired range.
On the other hand, the glasses of the comparative examples (No. A to No. C) of the present invention all have ν d > 31 and the partial dispersion ratio (θg, F) is (−0.00162 × νd + 0.64622). It was over. Therefore, it was clarified that the optical glass of the example of the present invention has a smaller partial dispersion ratio (θg, F) in the relational expression with the Abbe number (ν d ) than the glass of the comparative example.
また、本発明の実施例の光学ガラスは、いずれも屈折率(nd)が1.70以上、より詳細には1.82以上であるとともに、この屈折率(nd)は2.20以下、より詳細には1.87以下であり、所望の範囲内であった。
The optical glasses of the examples of the present invention all have a refractive index (n d ) of 1.70 or more, more specifically 1.82 or more, and this refractive index (n d ) of 2.20 or less. More specifically, it was 1.87 or less, which was within the desired range.
また、本発明の実施例の光学ガラスは、いずれもアッベ数(νd)が25以上、より詳細には30以上であるとともに、このアッベ数(νd)は35以下、より詳細には33以下であり、所望の範囲内であった。一方、本発明の比較例(No.A)のガラスは、νdが34を超えていた。従って、本発明の実施例の光学ガラスは、比較例(No.A)のガラスに比べてアッベ数(νd)が小さいことが明らかになった。
The optical glasses of the examples of the present invention all have an Abbe number (ν d ) of 25 or more, more specifically 30 or more, and this Abbe number (ν d ) of 35 or less, more specifically 33. And within the desired range. On the other hand, the glass of the comparative example of the present invention (No. A) are, [nu d was more than 34. Therefore, it was revealed that the optical glass of the example of the present invention has a smaller Abbe number (ν d ) than the glass of the comparative example (No. A).
また、本発明の実施例の光学ガラスは、λ70(透過率70%時の波長)がいずれも450nm以下、より詳細には410nm以下であった。また、本発明の実施例の光学ガラスは、λ5(透過率5%時の波長)がいずれも400nm以下、より詳細には357nm以下であった。このため、本発明の実施例の光学ガラスは、可視光に対する透過率が高く着色し難いことが明らかになった。
In addition, in the optical glasses of the examples of the present invention, λ 70 (wavelength at 70% transmittance) was 450 nm or less, more specifically 410 nm or less. In addition, in the optical glasses of the examples of the present invention, each of λ 5 (wavelength at 5% transmittance) was 400 nm or less, more specifically, 357 nm or less. For this reason, it became clear that the optical glass of the Example of this invention has the high transmittance | permeability with respect to visible light, and is hard to be colored.
従って、本発明の実施例の光学ガラスは、屈折率(nd)及びアッベ数(νd)が所望の範囲内にありながら、可視光に対する透過率が高く、且つ色収差が小さいことが明らかになった。
Therefore, it is clear that the optical glass of the example of the present invention has a high transmittance for visible light and a small chromatic aberration, while the refractive index (n d ) and the Abbe number (ν d ) are within the desired ranges. became.
以上、本発明を例示の目的で詳細に説明したが、本実施例はあくまで例示の目的のみであって、本発明の思想及び範囲を逸脱することなく多くの改変を当業者により成し得ることが理解されよう。
Although the present invention has been described in detail for the purpose of illustration, this embodiment is only for the purpose of illustration, and many modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention. Will be understood.
Claims (23)
- 質量%で、SiO2成分を5.0%以上40.0%以下、CaO成分を5.0%以上40.0%以下、及びNb2O5成分を15.0%以上50.0%以下含有し、部分分散比(θg,F)がアッベ数(νd)との間で、νd≦31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00275×νd+0.68125)の関係を満たし、νd>31の範囲において(-0.00162×νd+0.63822)≦(θg,F)≦(-0.00162×νd+0.64622)の関係を満たす光学ガラス。 By mass%, SiO 2 component is 5.0% or more and 40.0% or less, CaO component is 5.0% or more and 40.0% or less, and Nb 2 O 5 component is 15.0% or more and 50.0% or less. And the partial dispersion ratio (θg, F) is in the range of νd ≦ 31 with respect to the Abbe number (νd) (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (−0.00275 × vd + 0.68125), and an optical glass that satisfies the relationship (−0.00162 × νd + 0.63822) ≦ (θg, F) ≦ (−0.00162 × νd + 0.64622) in the range of νd> 31.
- 質量%で、ZrO2成分を0%超含有する請求項1記載の光学ガラス。 2. The optical glass according to claim 1, wherein the optical glass contains a ZrO 2 component of more than 0% by mass.
- 質量%で、ZrO2成分の含有量が15.0%以下である請求項1又は2記載の光学ガラス。 The optical glass according to claim 1 or 2, wherein the content of the ZrO 2 component is 15.0% or less by mass.
- 質量和(Nb2O5+ZrO2)が20.0%以上である請求項1から3のいずれか記載の光学ガラス。 The optical glass according to claim 1, wherein a mass sum (Nb 2 O 5 + ZrO 2 ) is 20.0% or more.
- 質量%で、TiO2成分の含有量が20.0%以下である請求項1から4のいずれか記載の光学ガラス。 The optical glass according to any one of claims 1 to 4, wherein the content of the TiO 2 component is 20.0% or less by mass%.
- 質量比TiO2/Nb2O5が0.50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。 The optical glass according to claim 1, wherein the mass ratio TiO 2 / Nb 2 O 5 is 0.50 or less.
- 質量比TiO2/(Nb2O5+ZrO2)が0.50以下である請求項1から6のいずれか記載の光学ガラス。 7. The optical glass according to claim 1, wherein a mass ratio TiO 2 / (Nb 2 O 5 + ZrO 2 ) is 0.50 or less.
- 質量%で、BaO成分を0%超30.0%以下含有する請求項1から7のいずれか記載の光学ガラス。 The optical glass according to any one of claims 1 to 7, which contains, by mass%, a BaO component of more than 0% and 30.0% or less.
- 質量比BaO/CaOが0.15より大きい請求項1から8のいずれか記載の光学ガラス。 The optical glass according to any one of claims 1 to 8, wherein the mass ratio BaO / CaO is larger than 0.15.
- 質量%で
MgO成分 0~20.0%
SrO成分 0~25.0%
ZnO成分 0~15.0%
である請求項1から9のいずれか記載の光学ガラス。 MgO component in mass% 0 to 20.0%
SrO component 0-25.0%
ZnO component 0-15.0%
The optical glass according to any one of claims 1 to 9. - RO成分(式中、RはMg、Ca、Sr、Ba、Znからなる群より選択される1種以上)の質量和が10.0%以上60.0%以下である請求項1から10のいずれか記載の光学ガラス。 The mass sum of the RO component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, Zn) is 10.0% or more and 60.0% or less. Any one of the optical glasses.
- 質量比ZnO/(MgO+CaO+SrO+BaO)が0.20以下である請求項1から11のいずれか記載の光学ガラス。 The optical glass according to claim 1, wherein the mass ratio ZnO / (MgO + CaO + SrO + BaO) is 0.20 or less.
- 質量%で、B2O3成分の含有量が30.0%以下である請求項1から12のいずれか記載の光学ガラス。 The optical glass according to any one of claims 1 to 12, wherein the content of the B 2 O 3 component is 30.0% by mass or less.
- 質量%で
Li2O成分 0~15.0%
Na2O成分 0~15.0%
K2O成分 0~15.0%
Cs2O成分 0~10.0%
である請求項1から13のいずれか記載の光学ガラス。 Li 2 O component by mass% 0 to 15.0%
Na 2 O component 0-15.0%
K 2 O component 0-15.0%
Cs 2 O component 0 to 10.0%
The optical glass according to any one of claims 1 to 13. - Rn2O成分(式中、RnはLi、Na、K、Csからなる群より選択される1種以上)の質量和が20.0%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。 The optical sum according to any one of claims 1 to 14, wherein the Rn 2 O component (wherein Rn is one or more selected from the group consisting of Li, Na, K, and Cs) has a mass sum of 20.0% or less. Glass.
- 質量%で
Y2O3成分 0~20.0%
La2O3成分 0~20.0%
Gd2O3成分 0~20.0%
Yb2O3成分 0~20.0%
である請求項1から15のいずれか記載の光学ガラス。 Y 2 O 3 component by mass% 0 to 20.0%
La 2 O 3 component 0-20.0%
Gd 2 O 3 component 0-20.0%
Yb 2 O 3 component 0-20.0%
The optical glass according to any one of claims 1 to 15. - 質量比La2O3/(BaO+CaO)が0.65以下である請求項1から16のいずれか記載の光学ガラス。 The optical glass according to claim 1, wherein a mass ratio La 2 O 3 / (BaO + CaO) is 0.65 or less.
- 質量%で
P2O5成分 0~20.0%
GeO2成分 0~10.0%
Al2O3成分 0~30.0%
WO3成分 0~20.0%
Ta2O5成分 0~15.0%
Bi2O3成分 0~10.0%
TeO2成分 0~30.0%
Sb2O3成分 0~3.0%
である請求項1から17のいずれか記載の光学ガラス。 P 2 O 5 component by mass% 0 to 20.0%
GeO 2 component 0 ~ 10.0%
Al 2 O 3 component 0-30.0%
WO 3 component 0-20.0%
Ta 2 O 5 component 0 ~ 15.0%
Bi 2 O 3 component 0 to 10.0%
TeO 2 component 0-30.0%
Sb 2 O 3 component 0-3.0%
The optical glass according to any one of claims 1 to 17. - 1.70以上2.20以下の屈折率(nd)を有し、25以上35以下のアッベ数(νd)を有する請求項1から18のいずれか記載の光学ガラス。 The optical glass according to claim 1, which has a refractive index (nd) of 1.70 or more and 2.20 or less and an Abbe number (νd) of 25 or more and 35 or less.
- 分光透過率が70%を示す波長(λ70)が450nm以下である請求項1から19のいずれか記載の光学ガラス。 The optical glass according to any one of claims 1 to 19, wherein a wavelength (λ 70 ) at which the spectral transmittance is 70% is 450 nm or less.
- 請求項1から20のいずれか記載の光学ガラスからなる研磨加工用及び/又は精密プレス成形用のプリフォーム。 A preform for polishing and / or precision press molding comprising the optical glass according to any one of claims 1 to 20.
- 請求項1から20のいずれか記載の光学ガラスを研削及び/又は研磨してなる光学素子。 An optical element obtained by grinding and / or polishing the optical glass according to any one of claims 1 to 20.
- 請求項1から20のいずれか記載の光学ガラスを精密プレス成形してなる光学素子。 An optical element formed by precision press-molding the optical glass according to any one of claims 1 to 20.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012190636A JP5783977B2 (en) | 2012-08-30 | 2012-08-30 | Optical glass, preform and optical element |
JP2012-190636 | 2012-08-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014034622A1 true WO2014034622A1 (en) | 2014-03-06 |
Family
ID=50183434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/072778 WO2014034622A1 (en) | 2012-08-30 | 2013-08-26 | Optical glass, preform, and optical element |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP5783977B2 (en) |
WO (1) | WO2014034622A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109592898A (en) * | 2017-10-02 | 2019-04-09 | 株式会社小原 | Optical glass, preform and optical element |
JPWO2021172484A1 (en) * | 2020-02-28 | 2021-09-02 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6727692B2 (en) * | 2014-10-29 | 2020-07-22 | 株式会社オハラ | Optical glass, preforms and optical elements |
JP6675772B2 (en) * | 2014-10-29 | 2020-04-01 | 株式会社オハラ | Optical glass, preform and optical element |
JP7076192B2 (en) * | 2016-11-30 | 2022-05-27 | 株式会社オハラ | Optical glass, preform materials and optical elements |
CN111253066B (en) * | 2018-12-03 | 2022-03-08 | 成都光明光电股份有限公司 | Optical glass, optical preform, optical element and optical instrument |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5431414A (en) * | 1977-08-15 | 1979-03-08 | Obara Optical Glass | Optical glass |
JPS61232243A (en) * | 1985-04-04 | 1986-10-16 | Ohara Inc | Glass for spectacle and optical use |
JPS62132741A (en) * | 1985-11-29 | 1987-06-16 | コ−ニング グラス ワ−クス | Optical and ophthalmic glass |
WO2001072650A1 (en) * | 2000-03-29 | 2001-10-04 | Kabushiki Kaisha Ohara | Optical glass and optical element |
JP2007169157A (en) * | 2005-12-23 | 2007-07-05 | Schott Ag | Optical glass |
-
2012
- 2012-08-30 JP JP2012190636A patent/JP5783977B2/en active Active
-
2013
- 2013-08-26 WO PCT/JP2013/072778 patent/WO2014034622A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5431414A (en) * | 1977-08-15 | 1979-03-08 | Obara Optical Glass | Optical glass |
JPS61232243A (en) * | 1985-04-04 | 1986-10-16 | Ohara Inc | Glass for spectacle and optical use |
JPS62132741A (en) * | 1985-11-29 | 1987-06-16 | コ−ニング グラス ワ−クス | Optical and ophthalmic glass |
WO2001072650A1 (en) * | 2000-03-29 | 2001-10-04 | Kabushiki Kaisha Ohara | Optical glass and optical element |
JP2007169157A (en) * | 2005-12-23 | 2007-07-05 | Schott Ag | Optical glass |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109592898A (en) * | 2017-10-02 | 2019-04-09 | 株式会社小原 | Optical glass, preform and optical element |
CN109592898B (en) * | 2017-10-02 | 2023-09-19 | 株式会社小原 | Optical glass, preform and optical element |
JPWO2021172484A1 (en) * | 2020-02-28 | 2021-09-02 | ||
WO2021172484A1 (en) * | 2020-02-28 | 2021-09-02 | Hoya株式会社 | Optical glass, optical element, light guide plate, and image display device |
CN115151515A (en) * | 2020-02-28 | 2022-10-04 | 豪雅株式会社 | Optical glass, optical element, light guide plate and image display device |
JP7427075B2 (en) | 2020-02-28 | 2024-02-02 | Hoya株式会社 | Optical glass, optical elements, light guide plates and image display devices |
Also Published As
Publication number | Publication date |
---|---|
JP5783977B2 (en) | 2015-09-24 |
JP2014047098A (en) | 2014-03-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5767179B2 (en) | Optical glass, preform and optical element | |
CN104129918B (en) | Optical glass, preform, and optical element | |
JP5721534B2 (en) | Optical glass, preform and optical element | |
JP6727692B2 (en) | Optical glass, preforms and optical elements | |
WO2012133420A1 (en) | Optical glass, preform, and optical element | |
JP6611299B2 (en) | Optical glass, preform and optical element | |
WO2011052687A1 (en) | Optical glass, preform, and optical element | |
JP2012206893A (en) | Optical glass, perform, and optical device | |
JP5783977B2 (en) | Optical glass, preform and optical element | |
JP2022167990A (en) | Optical glass, preform and optical element | |
JP5863745B2 (en) | Optical glass, preform and optical element | |
JP6860268B2 (en) | Optical glass, preforms and optics | |
JP2012240907A (en) | Optical glass, preform and optical element | |
JP5706231B2 (en) | Optical glass, preform and optical element | |
JP2017119619A (en) | Optical glass, preform and optical element | |
JP2012206891A (en) | Optical glass, perform, and optical device | |
JP5748613B2 (en) | Optical glass, preform and optical element | |
JP2014080317A (en) | Optical glass, preform and optical element | |
JP2017088485A (en) | Optical glass, preform and optical element | |
JP2017088486A (en) | Optical glass, preform and optical element | |
JP2017088484A (en) | Optical glass, preform and optical element | |
JP5748614B2 (en) | Optical glass, preform and optical element | |
WO2012133421A1 (en) | Optical glass, preform and optical element | |
JP2016088759A (en) | Optical glass, preform and optical element | |
CN104926101B (en) | Optical glass, lens preform, and optical element |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13833885 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13833885 Country of ref document: EP Kind code of ref document: A1 |