TW201236993A - Optical glass, preform, and optical element - Google Patents

Abstract

Provided are an optical glass which has a refractive index (nd) and an Abbe number ( d) in respective desired ranges and, despite this, is suitable for use in correcting chromatic aberration and a lens preform obtained using the optical glass. The optical glass comprises, with respect to the total mass of the glass in terms of oxide composition in mass%, 1.0-31.0% B2O3 component, 40.0-65.0% Ln2O3 component, up to 30.0% TiO2 component, and up to 30.0% Nb2O5 component. The lens preform comprises this optical glass as the base material.

Description

201236993 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical glass, a preform, and an optical element. [Prior Art] There is a certain amount of ambiguity called aberration in an optical system such as a digital camera or a video camera. The image difference is monochromatic aberration and chromatic aberration, and especially chromatic aberration mainly depends on the material properties of the lens used in the optical system. Here, in order to improve chromatic aberration, it is desirable that the partial dispersion ratio (0g, F) of the optical glass having a high refractive index and low dispersion region is small. The partial dispersion ratio (eg, f) is expressed by the following formula (1). 0g, F=(ng-nF)/(nF-nc) (1). In the optical glass, there is a substantially linear relationship between the partial dispersion ratio (eg, F) and the Abbe number (vd) indicating a partial dispersion of the short wavelength region. Regarding the straight line indicating the relationship, the partial dispersion ratio (eg, f) is used as the vertical axis, and the Abbe number (Vd) is used as the orthogonal coordinate of the horizontal axis to connect and depict the partial dispersion ratio of NSL7 and PBM2. The two points of the Abbe number are represented by a straight line, and the line is called a normal line (refer to Figure 1). Normal glass, which is the basis for regular lines, varies from manufacturer to manufacturer of optical glass, but each company defines it with roughly the same slope and intercept. (NSL7 and PBM2 are optical glass manufactured by OHARA Co., Ltd., the Abbe number (vd) of PBM2 is 36.3, the partial dispersion ratio (0g, F) is 0.5828, and the Abbe number (vd) of NSL7 is 60_5, partial dispersion ratio (0g, F) is 0_5436) ° Here, as a glass having a higher refractive index (nd) of 1.80 or more and a lower Abbe number (vd) of 161736.doc 201236993 of 30 or less, for example, Optical glass having a rare earth element component such as a component of 1^2〇3 is contained in a large amount as shown in Patent Documents 1 to 6. [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Patent Laid-Open No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. 〇 13 13 1 1 1 1 1 1 1 1 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 _ _ _ _ _ _ _ _ _ _ [Invention] [Problems to be Solved by the Invention] However, the optical glass of Patent Documents 1 to 6 has a low dispersion in a glass having a high refractive index, and on the other hand, a partial dispersion is large, which is insufficient for use. Correct the above-mentioned first-order optical lens. Namely, an optical glass having a high refractive index (nd) and a large Abbe number (Vd) and a small partial dispersion ratio (0g, F) is sought. The present invention has been made in view of the above problems, and an object thereof is to obtain an optical glass which has a refractive index (nd) and an Abbe number (Vd) within a desired range and can be preferably used for correction of chromatic aberration. 'And use lens preforms. [Means for Solving the Problems] The inventors of the present invention have repeatedly tried their best to solve the above problems, and found that the Ti 2 component and the Ti 2 component are used in combination with the B 2 3 component and the rare earth component (indicated by the Ln 2 3 component). The Nb2〇s component can obtain a glass having a high refractive index 161736.doc 201236993 and a low dispersion and a relatively small partial dispersion, a high transparency to visible light, and a low liquidus temperature, thereby completing the present invention. Specifically, the present invention provides the following. (1) An optical glass containing, by mass%, a B2〇3 component of 1.0 to 31.% and 1^2〇3 of a composition of 18.0 to 65.0%' and a TiO2 composition. The content of the component is 30.0% or less, and the content of the Nb2〇5 component is 30.0% or less. (2) The optical glass of the above (1) wherein the mass ratio of the oxide conversion composition is Ln2 〇 3 / Ti02 is 3.00 or more (wherein Ln is selected from La, Gd, Y,

One or more of the groups consisting of Yb and Lu). (3) The optical glass according to the above (1) or (2), wherein the total mass of the glass in terms of the oxide-converted composition is contained in mass% of La2〇3 component 18·0 to 60·0% 〇(4) The optical glass according to any one of the above (1) to (3), wherein the mass and (TiOdNbaO5) are from 8% by mass to 35.0% by mass based on the total mass of the glass of the oxide conversion composition. (5) The optical glass according to any one of (1) to (4) above, wherein the total mass of the glass relative to the oxide-converted composition is % by mass,

The Si〇2 component is 0 to 20.0%, and/or the Zr02 component is 〇1 to 15.0%. The optical glass according to the above (5), wherein the total mass of the glass replaced with the oxide contains the Si 〇 2 component i or more in mass%. (7) The optical glass according to the above (5) or (6), which contains Zr〇2 component 3 or more in mass% with respect to the total mass of the oxide-converted composition. 161736.doc 201236993 (8) as described above (1) to (7) An optical glass according to any one of the present invention, wherein the total mass of the glass relative to the oxide conversion composition is % by mass,

The Ge02 component is 〇10.0%, and/or the Ta205 component is 〇20.0%. (9) The optical glass according to the above (8), wherein the mass ratio (Ge02 + Ta205) / (Ti02 + Nb205) in the oxide-converted composition is 1.00 or less. (10) The optical glass according to any one of (1) to (9) above, wherein the mass and (Nh>2〇5+Ta2〇5) are 3.0% or more and 30.0% based on the total mass of the oxide-converted composition. the following. (U) The optical glass according to any one of the above (1) to (1), wherein a mass ratio of Ti〇2/(Nb205 + Ta205) in the oxide-converted composition is 0.80 or more. (12) The optical glass according to any one of the above (1) to (11), wherein, in mass%, the W03 component is 〇~10 0%, and/or Sn02, relative to the total mass of the oxide-converted composition. The composition is 〇~5.〇〇/0. (13) The optical glass according to (12) above, which contains more than 0.5% of the W03 component with respect to the total mass of the glass in terms of oxide conversion. (14) The optical glass according to any one of (1) to (13) above, wherein the total mass of the glass relative to the oxide conversion composition is % by mass,

The composition of Gd2〇3 is 〇~3〇.〇%, and/or Υ2〇3 is 〇20.0%, and/or Yb203 is 〇~6 〇%, and/or Lu2〇3 is 0~6.0% . (15) The optical glass according to any one of (1) to (14) above, wherein the total mass of the glass in terms of oxide composition is 161 736.doc -6 - 201236993, in mass ° /. meter,

The MgO component is 〇15.0%, and/or the CaO component is 〇15.0%, and/or the SrO component is 〇15.0%, and/or the BaO component is 〇35.0°/. The composition of ZnO and/or ZnO is 〇15.0%. (16) The optical glass according to the above (15), wherein the mass of the R〇 component (wherein R is one or more selected from the group consisting of Mg, Ca, Sr, and Ba) and the composition of the oxide The total mass of the glass is 35.0% or less. (17) The optical glass according to any one of the above, wherein the total mass of the glass in terms of oxide conversion is in mass%,

The composition of Li2 is 〇15.0%, and/or the composition of Na20 is 〇~15.〇%, and/or the composition of K20 is 〇15.0%. (18) The optical glass according to the above (17), wherein the mass of the Rn2〇 component (in the formula, one or more of the groups consisting of Li, Na, and K) and the total mass of the glass in terms of oxide conversion composition It is 10.0% or less. (19) The optical glass of any one of the above (1) to (18), wherein the P2O5 component is 〇1% to 10.0%, and/or Bi2〇, based on the total mass of the glass in terms of oxide conversion composition. The composition of 3 is 〇10.0%, and/or the composition of Te02 is 〇~10.〇〇/. And/or Al2〇3 component is 0~10.0%, and/or Ga203 component is 〇~1〇.〇%, and/or 161736.doc 201236993

The composition of Sb203 is 0~l.〇〇/0. (20) The optical glass according to any one of (1) to (19) above which has a refractive index (nd) of 1.80 or more and an Abbe number (Vd) of 22 or more and 30 or less. (21) The optical glass according to any one of (1) to (20) above which has a partial dispersion ratio of 0.615 or less, F). (22) A preformed material comprising the optical glass according to any one of (1) to (21) above. (23) An optical element produced by extrusion molding a preform material as described in (22) above (24) - an optical element which is as described in (丨) to (21) above One of the optical glasses is a base material. (25) An optical device comprising the optical element according to any one of the above (23) or (24). [Effects of the Invention] According to the present invention, it is possible to obtain a refractive index (nd) and an Abbe number (vd) in a desired range and can be preferably used for correction of chromatic aberration and high devitrification resistance. Glass, and prefabricated parts and optical components using the same. [Embodiment] In the optical glass of the present invention, the total mass of the glass relative to the oxide-converted composition is, by mass%, 1.0 to 31.0% of the B2〇3 component and [!12〇3 component 40.0 to 65.0°/. Further, the content of the TiO 2 component is 30.0% or less, and the content of the Nb 205 component is 30.0% or less. When the B2〇3 component and the rare earth element component (Ln203 component) are contained in a specific content range, the partial dispersion ratio of the glass becomes small, and the transparency to visible light is improved. Further, even in the case of the Ti〇2 component and the Nb2〇s component which have the effect of increasing the dispersion of 161736.doc 201236993, it can be obtained by containing a rare earth element component having a relatively small dispersion effect. Optical glass with a refractive index and low dispersion, and the liquidus temperature of the glass is lowered. Therefore, 'a refractive index (nd) and an Abbe number (vd) can be obtained within a desired range and can be preferably used for correction of chromatic aberration and high optical resistance to devitrification, and use thereof Preforms and optical components. Hereinafter, the embodiment of the optical glass of the present invention will be described in detail. The present invention is not limited to the following embodiments, and may be implemented by adding appropriate modifications within the scope of the gist of the invention. In addition, the description may be appropriately omitted in the description of the repetition, but the purpose of the invention is not limited. [Glass component] The composition range of each component constituting the optical glass of the present invention is described below. In the present specification, the content of each component, particularly in the case where it is not previously stated, is considered to be expressed by mass% of the total mass of the glass in terms of oxide composition. Here, the term "oxide-converting composition" means that when the oxide, the composite salt, and the metal fluoride which are assumed to be used as the raw material of the glass constituent component of the present invention are all dissolved and become oxides upon melting, The total mass of the produced oxide was set to 100% by mass, and the composition of each component contained in the glass was expressed. <About required component, arbitrary component> The B2〇3 component is a component which forms a network structure inside the glass and promotes stable glass formation. In particular, the liquid phase temperature of the glass can be lowered by making the content of the cerium 3 component 10% or more, and it is easy to obtain a stable glass. On the other hand, by making the content of the B2〇3 component 3 1 .〇% to 161736.doc 201236993, the refractive index is not easily lowered, so that the desired refractive index can be easily obtained. Therefore, the content of the B2〇3 component is preferably 1. 〇% as the lower limit, more preferably 3 〇% as the lower limit, and most preferably 5. 〇% as the lower limit, relative to the total mass of the oxide-converted composition. Preferably, it is an upper limit of 31.0%, more preferably an upper limit of 25.0%, and further preferably an upper limit of 2% by weight. The B2〇3 component can be contained in the glass, for example, using h3B〇3, Na2B407, Να2Β4〇7·1〇Η2〇, 3?〇4 or the like as a raw material. In the optical glass of the present invention, the mass of the component of the Ln2〇3 component (wherein Ln is selected from the group consisting of La, Gd, Y, Yb, and Lu) is preferably 18.0% or more and 65.0. %the following. Here, the desired higher refractive index and lower partial dispersion ratio can be easily obtained by making the mass sum be 18.0% or more, and the coloring can be made less. On the other hand, by making the mass sum 65.0 ° /. Hereinafter, the decrease in the dispersion of the glass can be suppressed, and the devitrification of the glass due to the excessive inclusion of the components can be reduced. Therefore, the mass of the content of the Ln2〇3 component and the total mass of the glass relative to the oxide-converted composition are preferably 18_0°/〇 as the lower limit, more preferably 3〇〇% as the lower limit, and further preferably 40.0%. The lower limit is preferably 45 〇% as the lower limit, preferably 65.0%, more preferably 62.0%, and most preferably 6 〇〇% upper limit. The Τι〇2 component is a component which increases the refractive index and dispersion of the glass and improves the resistance of the glass to devitrification. In particular, by increasing the content of the Ti 2 component to 3 〇 以下 % or less, the partial dispersion ratio of the glass is suppressed, and the light transmittance at the visible short wavelength (below 500 nm) is not easily deteriorated. Therefore, the content of the Ti 2 component is preferably 3 〇 〇 % as the upper limit and more preferably 25.0 ° / or less. The upper limit, and further preferably the upper limit of 22.0%, 161736.doc •10-201236993 is preferably the upper limit of 20.0%. For example, Ti 2 may be used as the original = and it may be contained in the glass. The desired optical constant and devitrification resistance can be obtained by containing a component. Therefore, the content of the Ti〇2 component is preferably 5% by weight with respect to the total amount of the glass of the oxide-converted composition. The thickness is preferably 6.6% as the lower limit, and s is preferably the lower limit of 8%. The best is 10.0% as the lower limit.

The Nb2〇5 component increases the refractive index and dispersion of the glass and improves the resistance of the glass to devitrification! In particular, by setting the content of the Nb205 component to be lower, devitrification caused by excessive inclusion of the Nb2〇5 component can be suppressed, and an increase in the partial dispersion ratio of the glass can be suppressed. Therefore, the content of the Nth component is preferably an upper limit of 3 〇 〇% with respect to the total mass of the oxide-converted composition, more preferably 25.0 ° / ❶, and further preferably 2 〇 / Q /. For the upper limit, the best is the upper limit of 1 5.0%. On the other hand, by containing the Nb2〇5 component, the desired optical constant and financial devitrification are obtained. Therefore, the content of the Nb2〇5 component is preferably 1% by weight as the lower limit, more preferably 2.0% as the lower limit, and more preferably 3·〇% as the lower limit. Jia is at a lower limit of 3.8%. The Nb2〇5 component can be contained in the glass, for example, using Nb2〇5 or the like as a raw material. The ratio of the content of the 'Ln2〇3 component to the content of the butyl bismuth 2 component in the optical glass of the present invention is preferably 3.00 or more. Thereby, a higher refractive index can be maintained and the liquid phase temperature of the glass is lowered to improve the stability and to reduce the coloration of the glass. Therefore, the mass ratio of the oxide-converted composition Ln2 〇 3 / Ti 〇 2 is preferably 3.00 as the lower limit', more preferably 3.20 as the lower limit, and most preferably 3 4 〇 as the lower limit. On the other hand, the upper limit of the mass ratio is, for example, 161736.doc 201236993 10.00 or less, more specifically, 800 or less, and more specifically 6 〇〇 or less.

The LazO3 component is a component which increases the refractive index of the glass and makes the dispersion smaller, in particular, 'by having the content of the La2〇3 component of 18% or more, a higher refractive index and a lower partial dispersion can be easily obtained. A glass that has a higher transmittance than visible light. On the other hand, the content of the La2〇3 component is 60.0°/. In the following, it is possible to suppress the decrease in the dispersion of the glass more than necessary, and to suppress the increase in the liquidus temperature caused by the excessive inclusion of the La 2 〇 3 component. Therefore, the content of the component of the La 2 〇 3 component relative to the oxide conversion is The mass is preferably 1 8.0 ° /. The lower limit is more preferably 25. /. The lower limit is further preferably 28.0% as the lower limit, and most preferably 3 〇% as the lower limit, preferably 60.0% as the upper limit, more preferably 58 〇% as the upper limit, and most preferably 55.0% as the upper limit. . The La2〇3 component can be contained in the glass, for example, using La(N〇3)3XH2〇 (X is an arbitrary integer) as a raw material. Further, in the optical glass of the present invention, the mass of the Ti 2 component and the Nb 2 5 component is preferably 8.0% or more and 3.5 % by weight or less. In particular, the desired high refractive index can be easily obtained by making the mass sum 3.0% or more'. On the other hand, 'the mass can be reduced by 3.5% or less, and the increase in dispersion due to the excessive inclusion of the components can be suppressed, and the decrease in the stability of the glass can be suppressed and further improved. Glass resistance to devitrification. Further, since the partial dispersion ratio of the glass is suppressed, the glass having a desired lower partial dispersion ratio can be obtained. Therefore, the mass and the total mass of the glass of (Ti〇2+Nb2〇5) relative to the oxide-converted composition are preferably 8.0/. The lower limit is more preferably 115%, and most preferably η is 161736.doc 12-201236993 lower limit, preferably 35.0% upper limit, more preferably 3〇〇% upper limit, most preferably 25.0% is the upper limit.

The Si 2 component is a component which increases the viscosity of the molten glass and lowers the liquid phase temperature of the glass to suppress devitrification (production of crystals), and is an optional component in the optical glass of the present invention. In particular, by setting the content of the Si 2 component to 20.0% or less, melting at a high temperature can be avoided and the decrease in the refractive index of the glass can be suppressed. Therefore, the content of the Si〇2 component is preferably 20.0% as the upper limit, more preferably 丨4 〇% as the upper limit, and even more preferably 100.0% as the upper limit. The best is the upper limit of 7〇%. Further, the Si 2 component may not be contained, but the resistance to devitrification of the glass can be improved by containing the Si 2 component. Therefore, the content of the Si〇2 component is preferably greater than 〇% with respect to the total mass of the oxide-converted composition. The thickness is preferably 1% by weight, more preferably 3.0%, and most preferably greater than 4. The 〇% ^ si〇2 component can be contained in the glass, for example, using Si〇2, KJiF6'Na2SiF6 or the like as a raw material.

The Zr〇2 component is a component of the optical glass of the present invention, which is a composition which reduces the refractive index of the glass of the southern region and lowers the liquidus temperature of the glass to improve the devitrification resistance. In particular, by making the content of the Zr〇2 component 丨5 〇% or less, the decrease in the Abbe number of the glass can be suppressed, and the melting at a high temperature during the production of the glass can be avoided, and the energy loss at the time of glass production can be reduced. Therefore, the content of the Zr〇2 component is preferably 丨5 .〇0/〇 as the upper limit, more preferably 10 〇%, and most preferably 8 〇%, based on the total mass of the glass in terms of oxide conversion composition. Upper limit. Further, the content of the 'Zr〇2 component may be 〇%, but the liquid phase temperature of the glass is lowered by containing the Zr 〇 2 component, so that the devitrification resistance can be easily improved 161736.doc -13· 201236993. Therefore, the content of the ζκ>2 component is preferably greater than 0% based on the total composition of the oxide-converted composition, more preferably 1% by weight, and more preferably 3.0% as the lower limit. 42% is the lower limit. The Zr 2 component can be contained in the glass, for example, using Zr 〇 2, ZrF 4 or the like as a raw material.

The GeOj sub-system has a component which increases the refractive index of glass and enhances the effect of devitrification resistance, and is an optional component in the optical glass of the present invention. However, since the raw material of the Ge 〇 2 component is expensive, if the amount is large, the material cost becomes high, and thus the obtained glass becomes impractical. Therefore, the content of the Ge 〇 2 component is preferably l 〇 〇 c / with respect to the total mass of the glass of the oxide conversion composition. The upper limit is more preferably 5.0%, and further preferably 3%, and most preferably 2.0%. The Ge 2 component can be contained in the glass, for example, using ruthenium 2 or the like as a raw material.

The Ta 5 component is a component which increases the refractive index of the glass and lowers the liquid phase temperature of the glass to provide devitrification resistance, and is an optional component in the optical glass of the present invention. In particular, by making the content of the Τ & 2 〇 5 component 2 〇 〇 % or less, the material cost of the glass can be reduced, and the melting at a high temperature can be avoided to reduce the energy loss during the production of the glass. Therefore, the content of the Ta2〇5 component is preferably an upper limit of 2〇.〇% with respect to the total mass of the oxide-converted composition, more preferably an upper limit of 15.0%, and even more preferably an upper limit of 1%%. The best is 5.0%. The Ta2〇5 component can be contained in the glass, for example, using Ta2?5 or the like as a raw material. Further, in the optical glass of the present invention, the mass of the Ge 〇 2 component and the Ta 2 〇 s component and the ratio of the mass of the Ti 〇 2 component to the 匕仏 匕仏 component are preferably 1.00 or less. Thereby, it is expensive in increasing the refractive index component 161736.doc S; 201236993

The content of the GeCh component and the Ta2〇5 component is reduced, so that the material cost of the optical glass can be reduced. Therefore, the mass ratio (Ge02 + Ta205) / (Ti02 + Nb205) in the oxide-converted composition is preferably an upper limit of 1·〇〇, more preferably an upper limit of 0.80, and most preferably an upper limit of 〇 5〇. Further, preferably, in the optical glass of the present invention, the mass of the Nb2〇5 component and the Ta2〇5 component is 3 〇〇/. The above 3〇 〇% or less. By setting the mass of the components to be in the range of 3.0% or more and 30.0% or less, the liquid phase temperature of the glass is lowered, so that optical glass having higher devitrification resistance can be easily obtained. Therefore, the mass and the total mass of the glass of (Nb2〇5+Ta2〇5) with respect to the oxide-converted composition are preferably 3.0% as the lower limit, more preferably 35% as the lower limit, and most preferably 3.8% as the lower limit. Preferably, it is an upper limit of 30.0%, more preferably an upper limit of 20.0%, and most preferably an upper limit of ι 5 〇%. Further, in the optical glass of the present invention, the ratio of the content of the TiO 2 component to the sum of the contents of the Nb 2 〇 5 component and the τ & 2 〇 5 component is preferably 〇 8 。 or more. Thereby, the stability of the glass can be improved and a higher refractive index can be obtained. Therefore, the mass ratio of the oxide-converted composition Ti〇2/(Nb2〇5 + Ta2〇5) is preferably 0.80 as the lower limit, more preferably 丨2〇 as the lower limit, and still more preferably 1.78 as the lower limit. In particular, '116 〇 β can be easily realized (in the case of the lower liquidus temperature below, it is more preferable to use 2 〇 5 as the lower limit. On the other hand, the upper limit of the mass ratio is, for example, 1 〇〇〇 or less, more specifically 8.00 or less, and more specifically 5 〇〇 or less. The WO3 component lowers the liquidus temperature of the glass to improve the devitrification-resistant component' and increases the refractive index of the glass. And the component of the dispersion is an arbitrary component in the optical glass of the present invention. In particular, the content of the chromatic dispersion ratio of the glass can be suppressed by making the amount of the 161736.doc 201236993 of the W〇3 component to be less than 10.0%. And the light transmittance of the visible short wavelength (below 500 nm) is not easily deteriorated. Therefore, the content of the w〇3 component is preferably 10.0 ° / or more, more preferably the upper limit of the glass composition of the oxide conversion composition. The upper limit of 7.0% and further preferably the upper limit of 5 〇% is preferably the upper limit of 3.0%. On the other hand, the content of the w 〇 3 component is preferably larger than the total mass of the glass of the oxide conversion composition. 〇%, more preferably 0.1% as the lower limit, Further, it is preferably 〇, 5%, the lower limit, and most preferably 0.6% as the lower limit. The WO3 component can be contained in the glass using, for example, a raw material, etc.

The Sn 2 component is an element which reduces the oxidation of the molten glass and clarifies the molten glass, and is an optional component in the optical glass of the present invention. In particular, by setting the content of the Sn 2 component to 5.0% or less, it is not easy to cause coloring of the glass or devitrification of the glass due to reduction of the molten glass. Further, since the alloying of the Sn 〇 2 component and the melting equipment (especially a noble metal such as Pt) is reduced, the life of the melting equipment can be extended. Therefore, the content of the Sn 〇 2 component is preferably 5.0% as the upper limit, more preferably 3.0%, and most preferably 丨 5% as the upper limit of the total mass of the glass in terms of the oxide conversion composition. Further, the content of the "ο" component may be 〇%, but the transmittance of the glass to visible light is not easily deteriorated by containing 0.1% or more of the Sn 〇 2 component. Therefore, the content of the Sn 〇 2 component is relatively small. The total mass of the glass of the oxide-converted composition is preferably 〇 as the lower limit, more preferably 0.3% as the lower limit, and further preferably the content may be more than 〇 5%. For the Sn02 component, for example, Sn 〇, Sn may be used. 〇2, SnF2, and the like are contained in the glass as a raw material. In the optical glass of the present invention, the ratio of the content of the w〇3 component to the content of Sn 〇 2 of 161736.doc 201236993 is preferably 0.1 or more and 3.0 or less. By making the ratio 'a lower liquid phase temperature of the glass' within a specific range and suppressing the coloration of the glass, the transmittance of visible light is improved. Therefore, the mass in the oxide-converted composition is better than WOVSnOdi. 〇.1 is the lower limit, more preferably 0.3 is the lower limit, and most preferably 〇.5 is the lower limit, preferably 3·0 is the upper limit, more preferably 2.5 is the upper limit, and the best is 2. Upper limit.

The Gd2〇3 component is a component that increases the refractive index of the glass and makes the dispersion smaller. In particular, by allowing the content of the Gd2〇3 component to be 30.0% or less, the phase separation of the glass is suppressed, and the glass is less likely to devitrify when the glass is produced. Therefore, the content of the Gd2〇3 component is preferably 30.0% as the upper limit, more preferably 28% by weight, and most preferably 25.0, based on the total mass of the oxide-converted composition. /. The upper limit. 0 (12〇3 component can be contained in glass, for example, Gd2〇3, GdF3, etc. as a raw material. Y2〇3 component, Yb2〇3 component, and Lu2〇3 component are components which raise the refractive index of glass, and make dispersion small. Here, the content of the γ2〇3 component is 20.0% or less, or the content of the Yb2〇3 component or the component of the component is 6.0% or less, so that the glass is not easily devitrified. Therefore, γ2〇 The content of the three components is preferably an upper limit of 2% by weight based on the total mass of the oxide-converted composition, more preferably an upper limit of 15.0%, still more preferably an upper limit of 1% by weight, and further preferably The upper limit is 9.0%, and the upper limit is preferably 8 〇%, more preferably 4.0%, and most preferably less than 2%. Further, the Yb2〇3 component and the Lu2〇3 component are used. The total mass of the glass relative to the oxide-converted composition is preferably an upper limit of 6.0%, more preferably an upper limit of 2% by weight, and further preferably an upper limit of 丨.5% 'best is 1%%. The upper limit is 161736.doc •17- 201236993 Υ2〇3 component, Yb203 component and Lu2〇3 component, for example, Υ2〇3, YF3, Yt>2〇 3. Lu2〇3 or the like is contained in the glass as a raw material.

The MgO component, the CaO component, the SrO component, and the Ba〇 component are components which improve the meltability of the glass and improve the devitrification resistance, and are optional components in the optical glass of the present invention. In particular, the refractive index of the glass can be made by setting the content of one or more of the Mg bismuth component, the CaO component, or the SrO component to 15% by weight or less, and/or by setting the content of the BaO component to 35.0% or less. The rate is not easily lowered' and the liquidus temperature of the glass is not easily increased. Therefore, the content of the Mg bismuth component, the CaO component, and the SrO component is preferably an upper limit of 15.0%, more preferably an upper limit of 1% by weight, and most preferably 6.0%, based on the total mass of the glass of the oxide conversion composition. The upper limit. Further, the content of the Ba〇 component is preferably an upper limit of 35 % by weight based on the total mass of the oxide-converted composition, more preferably an upper limit of 20.0%, and still more preferably an upper limit of 丨〇〇%. Jia is limited to 6.0%. For the MgO component, the CaO component, the SrO component, and the BaO component, for example, MgC03, MgF2, CaC03, CaF2, Sr(N03)2 can be used.

SrF2, BaC03, Ba(N03)2 and the like are contained in the glass as a raw material.

The ZnO-forming knives are components which improve the chemical stability of the glass, lower the glass transition point, and easily form a stable glass, and are optional components in the optical glass of the present invention. In particular, the devitrification resistance can be improved by suppressing the increase in the liquidus temperature of the glass by setting the content of the Zn0 component to 15% or less. Therefore, the content of the ZnO component is preferably 15.0% as the upper limit, more preferably 10.0%, and even more preferably 5.5 °/❶ as the upper limit of the total mass of the glass. In particular, when the photoelastic constant of the optical glass is suppressed to be low and the color rendering property for the optical element is high, 161736.doc •18·201236993 is used, and the content of the Zn〇 component is relative to oxidation. The total mass of the glass of the composition of the composition may be 0.08%. The p Zn 〇 component may be contained in the glass, for example, by using Ζη〇, 邱, or the like as a raw material. Preferably, in the optical glass of the present invention, the mass of the R 〇 component (wherein _ is selected from the group consisting of ... ^ and 〜 is a mass ratio of 35.0% or less. Reducing the devitrification of the glass caused by the excessive content of (10), and making the refractive index of the glass difficult to reduce. Therefore, the R 〇 component will be added to the stencil and relative to the oxide. The total mass of the glass of the converted composition is preferably 35.G% as the upper limit, more preferably Μ 〇% is the upper limit', and more preferably 15.0% is the limit, and further preferably 8 〇% is the upper limit. Jia is capped at 4.7%.

The Lis(R) component is a component which lowers the partial dispersion of the glass and which is a component which improves the meltability of the glass and lowers the glass transition point, and is an optional component in the optical glass of the present invention. In particular, when the content of the u2 bismuth component is 15 or less, the decrease in the refractive index of the glass is suppressed, and the content of the H component such as devitrification caused by excessive inclusion of the U2C) component is less likely to be formed with respect to the oxide conversion composition. The total mass of the glass is preferably 15.0. /. The upper limit is more preferably 5 〇%, and further preferably 3 is the upper limit, and it is preferably 2 〇%. The U2 〇 component can be contained in the glass, for example, using U/O3, LiN〇3, UF or the like as a raw material.

The Nae component is a component which improves the meltability of the glass and lowers the glass transition point, and is an optional component in the optical glass of the present invention. In particular, the content of the Na2 crucible can be made 15% or less, so that the refractive index of the glass is not easily lowered, and the stability of the glass is improved, and devitrification or the like is less likely to occur. Therefore, 161736.doc •19- 201236993

The content of the NkO component is preferably an upper limit of 15.0 〇 / 相对 with respect to the total mass of the oxide-converted composition. More preferably, the upper limit is 5 %, and the upper limit is preferably 3.0%. 2 〇% is the upper limit ^ Ν & 2 〇 component can be contained in glass, for example, using Na2C03, NaN03, NaF, Na2SiF6, etc. as a raw material. The component K2 is a component which improves the meltability of the glass and lowers the glass transition point, and is an optional component in the optical glass of the present invention. In particular, it is possible to suppress an increase in the partial dispersion ratio of the glass by making the content of the Κ2〇 component 150%. Further, by setting the content of the ruthenium 2 〇 component to 15 〇% or less, the refractive index of the glass is not easily lowered, and the stability of the glass is improved, and devitrification or the like is less likely to occur. Therefore, the content of the Κ2〇 component is preferably 15.0% as the upper limit, more preferably 5, and more preferably 3 〇%, and most preferably 2, based on the total mass of the oxide-converted composition. The upper limit. The Κ20 component can be contained, for example, in the glass using 2 (:03, ΚΝ〇3, KF, KHF2, and K2SiFe as a raw material. In the optical glass of the present invention, the RhO component can be used (wherein Rn is selected from The total content of the above-mentioned species of the group consisting of Li, Na, and K is 10.0% or less, and the refractive index of the glass is not easily lowered, and the stability of the glass is improved to reduce the occurrence of devitrification, etc. Therefore, the Rn2 component is obtained. The amount of f and the total mass of the glass relative to the oxide-converted composition are preferably an upper limit of 1% by weight, more preferably an upper limit of 5.0%, and most preferably an upper limit of 3 % by weight. In the optical glass of the present invention, the mass ratio of the b2〇3 component, the bismuth component, the W〇3 component, and the Lie component is 3% or more and 3% or less. By making the mass sum of 3.0% or more. , and the glass transfer point is changed to 161736.doc -20·201236993, so that the glass which is easy to be extruded can be obtained. On the other hand, the temperature of the liquid phase of the glass is increased by making the mass and 30.0% or less' Inhibition, so that glass with higher devitrification resistance can be easily obtained. Therefore, The total amount of the glass and the (BWs+ZnO+WCb+Li2.) relative to the oxide-converted composition is preferably 3.0% as the lower limit, more preferably 5 〇% as the lower limit, and most preferably 7.0% as the lower limit. Preferably, the upper limit is 3〇〇%, more preferably 20.0%, and the upper limit is 18.0%. Further, in the optical glass of the present invention, the bismuth component, the Zn0 component, and the W〇3 component are The mass of the Li2〇 component and the mass ratio of the Si〇2 component, the Ge〇2 component, the Ta2〇5 component, and the Nt>2〇5 component are preferably 〇5〇 or more and 5.00 or less. 〇.5 or more, and the content of the component which lowers the glass transition point is increased with respect to the component for increasing the glass transition point, so that the glass having a lower glass transition point can be easily obtained. On the other hand, by making the ratio 5.00 or less' However, the devitrification resistance of the glass can be easily improved. Therefore, the mass ratio in the oxide-converted composition (B2〇3+ZnO+W〇3+Li2〇>/(Si〇2+Ge〇2+Ta205+Nb205) It is preferable to use 0.50 as the lower limit, more preferably 0.55 as the lower limit, and the optimum is 〇.6〇 as the lower limit, preferably 5 〇〇 as the upper limit. More preferably, the upper limit is 4_00, and the upper limit is preferably 3.00, and the upper limit is 2.00. The P2〇5 component is a component having an effect of lowering the liquidus temperature of the glass and improving the resistance to devitrification. Any component of the optical glass of the invention, in particular, can reduce the chemical stability of the glass, especially the water resistance, by making the content of the cerium 5 component 10.0% or less. Therefore, the content of the P2〇5 component is The total mass of the glass relative to the oxide-converted composition is preferably 丨〇〇% 161736.doc -21 - 201236993 as the upper limit, more preferably Μ)»/. For the upper limit, the best is the upper limit of 5 〇%. The Ρ2〇5 component can be contained in the glass, for example, using Α1(Ρ〇3)3, Ca(P〇3)2, Ba(p〇3)2, BPO4, HsPO4 or the like as a raw material.

The BhCb component is an optional component in the optical glass of the present invention which increases the refractive index of the glass and lowers the composition of the glass transition point. In particular, by reducing the content of Bi2〇3 into a knives of 1% or less, it is possible to suppress the deterioration of the devitrification resistance of the glass or to suppress the increase in the partial dispersion ratio, and to make the visible short wavelength (5 〇〇 nm or less). The light transmittance is not easily deteriorated. Therefore, the content of the 2〇3 component is preferably an upper limit of 1〇 〇% with respect to the total mass of the oxide-converted composition, and more preferably an upper limit of 5.0% ‘optimally 3 〇% is the upper limit. Then, the 2〇3 component can be contained in the glass, for example, using BhO3 or the like as a raw material.

The Te〇2 component is a component which increases the refractive index and is an optional component in the optical glass of the present invention. However, in the case where the platinum or the portion in contact with the molten glass is a molten bath formed of platinum, when the glass raw material is melted, it can be alloyed with the turning. Therefore, the strength or heat resistance of the molten bath is easy. The problem of deterioration. Therefore, the content ratio of the Te〇2 component to the total mass of the glass in terms of the oxide-converted composition is preferably an upper limit of 1% by weight, more preferably an upper limit of 8, 〇%, and most preferably an upper limit of 5.0%. The Te〇2 component can be contained in the glass, for example, using Te〇2 as a raw material.

The Alz〇3 component is a component which is easy to form a stable glass and which improves the chemical stability of the glass. In particular, the deterioration of the devitrification resistance of the glass can be suppressed by setting the content of the A丨2〇3 component to 1:.

The content of the Ai2U3 component is preferably an upper limit of 10.0% with respect to the total mass of the oxide-converted composition, more preferably an upper limit of 5.0%, and most preferably 2% by weight.

• 22-201236993 Limit The ai2o3 component can be contained in glass, for example, using Ai2〇3, a](oh)3, a1F3, etc. as a raw material.

The Ga2〇3 component is a component which is easy to form a stable glass and which has an increased refractive index, and is an optional component in the optical glass of the present invention. In particular, by reducing the content of the GkO3 component by 1% or less, the reduction in the Abbe number of the glass can be suppressed, and the material cost of the glass can be reduced. Therefore, the content of the Ga2〇3 component is preferably an upper limit of 0/〇, more preferably an upper limit of 5, and most preferably an upper limit of 2% by weight, based on the total mass of the glass of the oxide-converted composition. The GaA3 component can be contained in the glass, for example, using Ga2〇3, Ga(〇H)3 or the like as a raw material.

The Sh〇3 component is a component which defoams molten glass is an arbitrary component in the optical glass of this invention. In particular, it is possible to make the 讥2〇3 component difficult to alloy with a melting device (especially a noble metal such as ruthenium) by making the content of the % 〇 3 component 1.0% to τ and not easily generating the glass (four). Therefore, the content of the Sb2〇3 component is preferably the upper limit of (10) with respect to the total mass of the glass in terms of the oxide conversion composition, and the upper limit is preferably 〇8%, and the upper limit is 〇. The Sb2〇3 component can be contained in the glass, for example, using a material called 〇3, b, and Na2H2Sb2 (V5H2C). Further, 'the component which clarifies and defoams the glass is not limited to the above-mentioned common component'. A well-known detergent in the field of glass production, ::: or a combination of these may be used. In this case, the total content of the Sb2〇3 component or the "A component or the like" is preferably an upper limit of h〇%, more preferably 〇8% ^, and most preferably 0.5% upper limit. In view of the fact that it is easy to obtain a glass with less load on the clothes, the content of the antifoaming agent can be set to 161736.doc -23- 201236993 can also be set to less than ι·ι%. The component contained therein is described with respect to the component which should not be contained in the optical glass of the present invention, and the component which is preferably not contained. In the optical glass of the present invention, it is possible to avoid the characteristics of the glass of the invention of the present invention. Other components are added as needed. Among them, the Ge 2 component is preferably substantially free of such components because it knows the dispersibility of the glass. Further, in addition to Ti, Zr, Nb, W, La, Gd, Y, Yb In addition to Lu, V, Cr, Μη, Fe, Co, Ni, Cu, Ag, and each transition metal may cause the glass to be colored to absorb the visible light region even when the components are contained in a small amount, either alone or in combination. a particular wavelength, so it is preferred to use a visible region, especially The long-term optical glass does not substantially contain such a component. Further, a lead compound such as PbO and an arsenic compound such as aS2〇3, and various components of Th, Cd, yttrium, Os, Be, and Se are present as harmful chemicals in recent years. The tendency to control the use of environmental protection measures must be taken not only in the manufacturing steps of the glass, but also in the processing steps and after the product is processed. Therefore, it is preferable to pay attention to environmental influences. In addition to the inevitable mixing, the material is not substantially contained. Therefore, the optical glass does not substantially contain substances that pollute the environment. Therefore, it can be manufactured, processed, and discarded without taking special measures to protect the environment. Optical glass. In the glass composition of the present invention, since the composition is expressed by mass% of the total mass of the glass in terms of oxide composition, it cannot be expressed as mol 161 736.doc -24 · 201236993 The description of the composition of the mol% of each component present in the glass composition satisfying the characteristics required in the present invention is oxidized. The composition of the material is approximately the following values: B203 component 2.0~55·0. mol%, Ti02 component greater than 0 mol% 〜55.0 mol%, and Nb2〇5 component and greater than 0 mol%~20.0 mol%, La2〇 3 components 0~30.0 mol%, and/or Si〇2 component 0~50.0 mol%, and/or Zr02 component 0~20.0 mol%, and/or Ge02 component 0-10,0 mol%, and/or Ta2〇 5 components 0 to 7.0 mol%, and/or W03 components 0 to 7.0 mol%, and/or Sn02 components 0 to 5.0 mol%, and/or Gd2〇3 components 0 to 12.0 mol%, and/or Y2〇3 components 0~20.0 mol%, and/or Yb2〇3 component 0~3.0 mol%, and/or Lll2〇3 component 0~3.0 mol%, and/or MgO component 0~45.0 mol°/. And/or CaO component 0~35.0 mol%, and/or SrO component 0~30.0 mol%, and/or BaO component 0-50.0 mol%, and/or ZnO component 0~30.0 mol%, and/or Li20 component 0~55.0 mol%, and/or 161736.doc -25- 201236993

Na2〇 component 0~40.0 mol%, and/or K2〇 component 0~30.0 mol%, and/or P2O5 component 0~15.0 mol°/. And/or 2〇3 components 〇~3.0 mol%, and/or Te02 components 0~10.0 mol%, and/or AI2O3 components 〇~20.0 mol%, and/or Ga2〇3 components 0~10.0 mol%, And/or Sb2〇3 component 0 to 0.5 mol% [Production method] The optical glass of the present invention is produced, for example, in the following manner. In other words, a mixture prepared by mixing the above-mentioned raw materials in a range in which the respective components are within a specific content is put into a platinum crucible, a quartz crucible, or an oxidized stack, and is roughly melted, and thereafter, gold crucible, platinum is introduced.坩埚, 合金 合金 合金 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 舶 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 The optical glass of the present invention is produced by finely agitating to remove the texture and then forming using a forming mold. [Physical Properties] The optical glass of the present invention preferably has a specific high refractive index and has a low dispersion (higher Abbe number. More specifically, the refractive index (nd) of the optical glass of the present invention is preferably丨8〇 is the lower limit, more preferably 1 Μ is the lower limit' and further preferably the sub 为 is lower, and most preferably 195 is the lower limit: another aspect, the refractive index (nd) of the optical glass of the present invention The upper limit is not limited to -26-161736.doc

201236993 is fixed, but in most cases it is approximately 2.20 or less, more specifically 21〇 or less, and specifically 225 or less. Further, the Abbe's number (vd) of the optical glass of the present invention is preferably 22 as the lower limit, more preferably 24 as the lower limit, and most preferably 26 as the lower limit. On the other hand, the upper limit of the Abbe number (vd) of the optical glass of the present invention is not particularly limited, but in many cases, it is approximately at most %. As a result, the degree of freedom in optical design is increased, and even if the element is thinned, a large amount of light can be obtained. Further, the optical glass of the present invention has a lower partial dispersion ratio (0g, F). More specifically, the optical glass of the present invention has a partial dispersion ratio (eg, f) below 〇615. Thereby, even in the region of high refractive index and low dispersion, an optical glass having a relatively small partial dispersion can be obtained, so that chromatic aberration of the optical element formed of the optical glass can be reduced. Here, the partial dispersion ratio (eg, f) of the optical glass is preferably an upper limit of 〇·615, more preferably an upper limit of 〇61〇, and most preferably an upper limit of 0.605. On the other hand, the lower limit of the partial dispersion ratio (0g, F) of the optical glass of the present invention is not particularly limited, and is usually substantially 0.585 or more, more specifically 〇.588 or more, and more specifically 0.590 or more. The partial dispersion ratio (eg, f) of the optical glass of the present invention is measured based on the Japanese Optical Glass Industry Association specification JOGIS01-2003. Further, the glass used in the measurement was set to a slow cooling rate of -25. ()/hr is processed by a slow cooling furnace. Further, the optical glass of the present invention preferably has less coloration. In particular, the optical glass of the present invention has a thickness of 1 if it is expressed by the transmittance of glass. 〇161736.doc -27· The sample showing the spectral transmittance of 7〇% (λ7〇) in the sample of 201236993 mm is 52〇nm&, more preferably 500 run or less, and most preferably 48〇nm or less. The optical glass of the present invention exhibits a wavelength (λ;) of 5% of the spectral transmittance in a thickness of 10 samples of 420 nm or less, more preferably 4 Å or less, and most preferably 38 Å or less. The absorption end of the glass is located in the vicinity of the ultraviolet region, and the transparency of the glass in the visible light region is improved, so that the optical glass can be used as a material of an optical element such as a lens. The transmittance of the optical glass of the present invention is based on the Japanese optical glass industry. The measurement is performed in accordance with the specification JOGIS02. Specifically, the light transmittance of 2 〇〇 to 8 〇〇 nm is measured according to JIS Z8722 with a thickness of 1 〇 ± 〇丨 opposite parallel polishing product, and λ 7 〇 (penetration rate 70) is obtained. Wavelength at %) and person 5 (wavelength at 5% penetration) Further, the optical glass of the present invention preferably has a high resistance to devitrification. In particular, the optical glass of the present invention preferably has a lower liquidus temperature of 124 (r or less. More specifically, the optical glass of the present invention The liquidus temperature is preferably an upper limit of 1240 C. More preferably, 12 〇〇 <> c is the upper limit, and further preferably 118 〇 ° C is the upper limit, and most preferably 1160 ° C is the upper limit. Thereby, the stability of the glass is improved and the crystal is reduced, so that the devitrification resistance when the glass is formed from the molten state can be improved and the influence on the optical characteristics of the optical element using the glass can be reduced. On the other hand, the present invention The lower limit of the liquidus temperature of the optical glass is not particularly limited. However, the liquid phase temperature of the glass obtained by the present invention is mostly 5 〇〇. (: Above, specifically 55 〇eC or more, and more specifically 60 〇 °c or more. 161736.doc -28- 201236993 About the liquidus temperature of the optical glass of the present invention, a glass sample of 30 cc glass frit is placed in a 50 ml capacity conversion At 1350 °C, it becomes completely molten, and then cools down to 1 300. (:~1000. (: Every temperature set by 〇 °C for 12 hours, then taken out to the outside of the furnace and immediately observed immediately after cooling, whether there is crystal on the glass surface and glass, and according to this In addition, the devitrification resistance of the optical glass of the present invention can be determined by the following heat preservation test in addition to the liquid phase temperature: the glass raw material is put into 5 〇 cc is made in 坩埚 并 使其 1200 ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 1400 ( 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 1400 The furnace was kept for 10 hours' and the crystals on the surface and inside of the glass and the contact surface with the inner wall of the crucible were observed. [Preform and optical element] For example, a glass molded body can be produced from the produced optical glass by a method of press forming such as reheat extrusion molding or precision extrusion molding. That is, the preform for the press molding can be made of optical glass, and then the preform can be subjected to a reheat extrusion molding to be subjected to a grinding process to form a glass molded body, or a preform which can be processed, for example, by grinding. Precision extrusion molding is performed to form a glass molded body. Further, the method of forming the glass molded body is not limited to these. The glass formed body produced in the above manner can be used in various optical elements, and particularly preferably used for optical elements such as lenses or iridium. By this, the blurring of the color caused by the chromatic aberration 161736.doc •29-201236993 is reduced in the transmitted light of the optical system provided with the optical element. Therefore, the subject can be more accurately expressed when the optical element is used in a camera, and the desired image can be projected with higher precision and high chroma when the optical element is used in the projector. [Examples] The compositions of the examples (No. 1 to No. 63) and the reference examples (No. 1 to Νο. 3) of the present invention, and the refractive indices (nd) and Abbe numbers of the glasses (the glass) Vd), partial dispersion ratio (eg, F), wavelength (λ70) [ηιη] at a transmittance of 70%, wavelength (λ5) [nm] at a transmittance of 5%, and liquidus temperature [°C] The values are shown in Tables 1 to 9. Further, the following examples are for illustrative purposes only, and the invention is not limited to the embodiments. Regarding the glass of the examples (No. 1 to No. 63) and the reference examples (No. 1 to No. 3) of the present invention, respective oxides, hydroxides, carbonates, nitrates, and fluorides were selected. A high-purity raw material used in a usual optical glass such as a metaphosphoric acid compound is used as a raw material of each component, and is weighed so as to have a ratio of the composition of each of the examples and the reference examples shown in Table 9, and uniformly mixed, and thereafter, In the platinum crucible, it is in the electric furnace at 1200~1500 depending on the ease of melting of the glass composition. (The temperature range is melted for 3 to 5 hours, homogenized by stirring, defoamed, etc., and then cast in a mold and slowly cooled to prepare glass. Here, Examples (No. 1 to No. 63) The refractive index (nd), the Abbe number (Vd), and the partial dispersion ratio (0g, F) of the glass of the reference example (No.^No 3) were measured based on the Japanese Optical Glass Industry Association specification JOGIS01-2003. , the test -30- 161736.doc

The glass system used in 201236993 will set the slow cooling rate to -25. 〇/hr and use a slow cooling furnace for processing. Further, the glass transmittances of the examples (Νο·1 to No. 63) and the reference examples (No. 1 to No. 3) were measured based on the Japanese Optical Glass Industry Association specification JOGIS02. Further, in the present invention, the presence or absence of the coloration of the glass is determined by measuring the transmittance of the glass. Specifically, the opposite parallel polishing product having a thickness of 10 μm” mm is measured for the light transmittance of 200 to 800 nm according to JIS Z8722 and the wavelength (λ70) and λ5 (penetration rate 5) at a transmittance of 70% are determined. The wavelength at %). Further, regarding the liquid phase temperature of the glass of the examples (No.1 to No.63) and the reference example (No.1 to Νο.3), the platinum solution of the capacity of 5 〇ml was thrown into the glass crumb of 3 〇cc. The glass sample was allowed to become completely molten at 丨35 ° C, and then cooled to 1300. (:~i〇〇〇°c for every 1 inch.) Set any temperature for 12 hours, then take it out to the outside of the furnace and immediately observe the glass surface and the crystal in the glass after cooling, according to this time. It was found that the lowest temperature of the crystal was not confirmed. 161736.doc -31- 201236993 [Table i] Example 2 3 4 5 6 7 8 B2〇3 9.943 9.842 9.972 9.803 9.921 ».611 9.857 9.428 TiOj 1 4.624 14.476 13.389 14.419 14.592 14.135 14.204 11.967 NbaOe 8.122 8.040 8.146 8.008 8.104 7.851 7.889 9.602 La203 46.803 46.331 46.940 46.146 46.701 47.787 48.020 49.255 sio2 4.821 4.773 4.836 4.754 4.81 1 4.660 4.683 4.572 ZrOz 5.962 5.902 5.980 5.878 5.949 5.763 5.791 5.653 GeO 2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta8Oe 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W〇3 0.000 0.000 0.000 0.000 0.700 0.678 0.681 0.665 Sn02 0.000 1.1Θ0 1.187 1.186 0.700 0.678 0.681 0.665 GdaOa 7.752 7.674 7.775 7.644 7.735 7.493 7.530 7.351 0.570 0.564 0.572 0.562 0.569 0.551 0.554 0.541 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0-000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.000 0:000 0.000 0.000 0.000 0.000 0.000 0.000 ZnO 1.403 0.000 0.000 0.000 a.ooo 0.000 0.000 0.000 LiaO 0.000 1.190 1.187 1.381 a.2〇o 0.775 0.292 0.285 Na20 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 KaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ai£o3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Sb2〇3 0.000 0.018 0.018 0.0 18 0.0t8 0.018 0.018 0.017 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La+Gd+Y+Yb+Lu 55.126 54.569 55.287 54.353 55.005 55.832 56.104 57.146 (Le+Gd+Y + Yb + Lu)/Ti 3.770 3.770 4.129 3.770 3.770 3.950 3.950 4.775 Ti+ Nb 22.746 22.5t6 21.535 22.427 22.696 21.986 22.093 21.568 (Ge+Ta)/(Ti + Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb-^Ta 8.122 8.040 8.146 8.008 8.104 7.851 7.689 9.602 Ti/(Nb+Ta) 1. Θ01 1.801 1.644 1.80t 1.801 1.801 1.601 1.246 W/Sn - 0.000 0.000 0.000 1.000 1. 000 1.000 1.000 Mg+Ca+Sr+Ba+Zn 1.403 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li + Na + K 0.000 t.190 1.187 1.581 0.200 0.775 0.292 0.285 B+2n+W+Li 11.345 11.032 11.158 11.384 10.821 11.063 10.631 10.378 (Si+Ge+Ta+Nb)/ (B+Zn+W+Lr) 1.141 1.16t 1.163 1.121 1.194 1.131 1.183 1.366 2.0009 1.98905 1.98207 1.98404 2.001 21 1.9954Θ 2.00102 1.99620 28.3 28.7 29.3 28.9 28.3 28.7 28.5 29.3 Θ g,F 0.6024 0.6009 0.6030 0.6017 0.6012 0.5992 and 70 451.5 465.5 460.5 462 471.5 458 466.5 449.5 At 369 368.5 386.5 366.5 373 368 37 1 366.5 Liquid temperature 1220 161736.doc • 32-

201236993 [Table 2] Example 9 10 11 12 13 1.4 15 16 B2〇3 9.428 9.428 9.428 9.428 9.518 8.559 9.657 9.705 τιο2 Η.967 13.392 13.867 11.967 12.561 12.081 12.258 12.318 Nb2Oe 9.602 9.602 7.702 9.602 9.214 9.694 9.835 9.884 La2〇a 47.354 47.829 49.255 49.255 48.768 49.727 48.020 47.768 Si02 4.572 4.572 4.572 4.572 4.61 6 4.616 4.683 4.706 2r02 5.653 5.853 5.653 5.653 5.707 5.707 5.791 5.819 GeOz 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta2〇B 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W〇3 0.665 0.665 0.665 0.665 0.671 0.671 0.681 0.685 Sn02 0.665 0.665 0.665 0.665 0.671 0.671 0.681 0. Θ85 Gd203 7.351 7.351 7.351 7.351 7.422 7.422 7.530 7.567 Ya〇3 0.541 0.54t 0.541 0.541 0.546 0.546 0.554 0.556 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 1.900 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 LiaO 0.285 0.285 0.285 0.285 0.288 0.288 0.292 0.293 Na20 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 k2o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ai2o3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Sb2Oa 0.017 0.017 0.017 0.018 0.017 0.017 0.018 0.018 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La+Gd+Y+Yb+Lu 55.246 55.721 57.146 57.146 56.735 57.694 56.104 55.889 (La + Gd+Y+Yb + Lu)/Ti 4.617 4.161 4.121 4.775 4.517 4.775 4.577 4.537 Ti + Nb 21.568 22.994 21.568 21.566 21.775 21.775 22.093 22.201 (Ge + Ta) / (Ti + Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb + Ta 9.602 9.602 7.702 9.602 9.214 9.694 9.835 9.884 Ti/(Nb+Ta) 1.246 1.395 1.801 1.246 1.363 1.246 1.24B 1.246 W /Sn 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 Mg+Ca+Sr+Ba+Zn 1.900 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li+Na+K 0.285 0.285 0.285 0.285 0.288 0.238 0.292 0.293 B+Zn+W+Li 10.378 10.378 10.378 10.378 10.478 9.518 10.631 10.683 (Si+Ge+Ta+Nb)/ (B+Zn+W+Li) 1.366 1.36G 1.183 1.366 1.320 1.503 1.366 1.366 Ι.ΘΘ100 2.00393 2.00126 1.99637 1.99755 a.00463 t.99584 1.99344 29.3 28.5 28.7 29.3 29 29 29 28.9 9g.f 0.5988 0.6012 0.6009 0.5995 0.6002 0.5990 0.6008 0.6001 A, 〇447.5 454 459.5 448.5 461.5 455.5 464.5 456.5 and 5 36a.5 368.5 369 36β.5 369 307 370 369 Liquidus temperature 1220 1200 33-161736.doc 201236993 [Table 3] Example 17 18 L9 20 21 22 23 24 b2〇3 9.339 8.734 9.428 9.428 9.428 9.428 9.428 9.998 Τί〇2 1 1.854 1 1.Θ67 11.967 1 1.967 11.967 11.967 11.967 13.857 Nb205 9.511 9.602 9.602 9.802 9.602 9.602 9.Θ02 9.602 La 2 〇3 48.791 49.255 47.354 45.454 48.305 39.754 35.003 4Θ.794 SIO£ 4.529 4.572 4.572 4.572 4.572 4.572 4.572 4.572 Zr02 5.600 5.653 5.653 5.653 5.653 5.653 5.653 5.653 GeOs 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta2O0 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W〇3 0.659 0.665 0.665 0.665 0.665 0.665 0.665 0.665 Sn02 0.659 0.665 0.666 0.665 0.665 0.665 0.665 0.665 Gd203 7.282 8.045 9.2 51 11.151 7.351 16.652 21.603 7.351 Y2〇3 0.536 0.541 0.541 0.541 0.541 0.541 0.541 0.541 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.941 0.000 0.000 0.000 0.950 0.000 0.000 0.000 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 LizO 0.282 0.285 0.285 0.285 0:285 0.285 0.285 0.285 Na20 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 k2o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Al203 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Sb203 0.017 0.017 0.017 0.017 0.01 7 0.018 0.017 0.017 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La+Gd+Y+Yb+Lu 56.608 57.840 57.146 57.140 56.196 57.146 57.14« 54.685 (La+Gd+Y+Yb+Lu)/Ti 4.775 4.833 4.775 4.775 4.696 4.775 4.775 3.946 Ti + Nb 21.365 21.568 21.568 21.568 21.568 21.568 21.568 23.459 (Ge+Ta)/(Ti+Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb + Ta 9.511 9.602 9.602 9.602 9.602 9.602 9.602 9.602 Ti/(Nb+Ta) 1.246 1.246 1.246 1.246 1.246 1.246 1.246 1.443 W/Sn 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 Mg+Ca + Sr+Be + Zn 0.941 0.000 0.000 0.000 0.950 0.000 0.000 0.000 Li + Na + K 0.282 0.285 0.285 0.285 0.285 0.285 0.285 0.285 B+Zn+W+LI 10.280 9.684 1(?.378 10.378 10.378 10.378 10.378 10.948 (Si+Ge+Ta+Nb)/ (B+Zn+W+Li) 1.366 1.464 1.366 1.366 1.366 1.366 1.366 1.295 1.99407 2.00275 1.99643 1.99655 1.99399 1.99642 1.99578 2.00136 29.3 29.2 29.3 29.2 29.3 2Θ.2 29.1 28.3 Θ g,F 0.5986 0.5988 0.5ΘΘ8 0.6003 0.5968 0.6004 0.5998 0.60277 Fork, 0 456 445.5 445.5 449 447 450 458.5 451.5 and δ 367 366.5 366.5 367 366 367.5 369.5 359 Liquidus temperature Π80 34-161736.doc 201236993 [Table 4] Example 25 26 27 28 29 30 31 B2〇3 9.998 9.998 9.998 9.420 8.734 9.428 9.428 τιο2 13.392 13.629 13.487 11.956 11.967 12.641 13.392 Nb2Os 10.552 10.077 10.219 9.593 Θ.602 1 1.027 9.602 La203 46.309 46.547 46.547 49.212 49.948 49.055 47.829 sio2 4.572 4.572 4.572 4.568 4.572 4.572 4.572 2rOa 5.653 5.653 5.653 5.648 5.653 3.753 5.653 GeOg 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta203 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W〇3 0.665 0.665 0.665 0.664 0.665 1.206 0.665 SnOa 0.665 0.6Θ5 0.565 0.664 0.665 0.665 0.665 Gd2Oa 7.351 7.351 7.351 7.345 7.351 7.351 7.351 Y2〇3 0.541 0.541 0.541 0.540 0.541 0.000 0.541 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.000 .0.000 0.000 0.000 0.000 0.000 0.000 ZnO 0:000 0.000 0.000 0.000 0.000 0.000 0.000 Li20 0.285 0.285 0.285 0.285 0.285 0.285 0.285 NazO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 k2o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ai2o3 0.000 0.000 0.000 0.000 0.000 0.000 Sb2〇3 0.017 0.017 0.01 7 0.104 0.01 7 0.017 0.017 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La+Gd+Y+Yb+Lu 54.201 54.438 54.438 57.096 57.840 56.406 55.721 (La+Gd+Y+Yb+Lu)/Ti 4 .047 3.994 4.03Θ 4.775 4.833 4.462 4.161 Ti+Nb 23.944 23.706 23.706 21.550 21.568 23.668 22.994 (Ge+Ta)/(Ti+Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb+Ta 10.552 10.077 10.219 9.593 9.602 11.027 9.602 Ti/( Nb + Ta) 1.2Θ9 1.353 1.320 1.246 1.246 1.148 1.395 W/Sn 1.000 1.000 1.000 1.000 1.000 1.813 1.000 Mg+Ca+Sr+Ba+Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li+Na+K 0.285 0.285 0.285 0.285 0.285 0.285 0.285 B+Zn+W+Li 10.948 10.948 10.d48 10.369 9.684 10.D19 10.378 <Si+Ge+Ta+Nb)/ (B+Zn+W+U) 1.381 1.338 1.351 1.366 1.464 1.429 1.366 nd 2.00180 2.00160 2.00109 1.99647 2.00273 2.00216 2.00443 28.2 28.2 28.3 29.3 29.2 28.5 28.5 Θ gF 0.60175 0.60209 0.60226 0.5999 0.5987 0.6014 0.6018 A 70 449 453.5 451.5 458.5 455 461.5 462 and 3 368.5 369.5 369 374.5 367 370.5 370 Liquid temperature 1200 1180 1180 35- 161736.doc 201236993 [ Table 5] Example 32 33 34 35 36' 37 38 b2〇3 9.998 9.998 9.932 9.932 9.932 9.932 9.932 Ti〇2 15.758 16.708 15.758 15.758 1 5.758 15.758 15.758 N b2Os 5.863 3.Θ9Θ 5.863 5.663 5.863 5.863 5.863 La203 48.632 49.549 49.23S 48.698 46.389 52.089 45.848 SiOz 4,572 4.572 4.572 4.572 4.572 4.572 4.572 Zr02 5.653 5.653 5.653 5.653 5.653 5.653 5.653 G ο O e 0,000 0.000 0.000 0.000 0.000 0.000 0.000 Ta2〇a 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 〇 3 0.665 0.665 0.665 0.665 0.665 0.665 0.665 Sn02 0.665 0.665 0.665 0.665 0.665 0.665 0.665 Gd203 7.351 7.351 7.351 7.892 10.201 4.501 10.742 Y2〇3 0.541 0.541 0.000 0.000 0.000 0.000 0.000 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.000 0.000 0.000 0.000 0.000 0.000 0,000 ZnO 0.000 0.000 0.000 o.ooo 0.000 0.000 0.000 U20 0.285 0.285 0.285 0.285 0.285 0.285 0.285 NaaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 K2o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 A'2〇3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Sb2〇3 0.017 0.017 0.017 0.017 0.017 0.01 7 0.017 TOTAL 100.00 to O.oo 100.00 100.00 100.00 100.00 100.00 La+Gd+Y+Yb+Lu 56.524 57.441 56.590 56.590 56.590 56.590 56.590 (La+Gd+Y+Yb+Lu)/Ti 3.587 3.438 3.591 3.591 3.591 3.59t 3.591 Ti+Nb 21.621 20.704 21.621 21.821 21.621 21.621 21.621 (Ge+Ta)/(Ti+Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb + Ta 5.663 3.996 5.863 5.863 5.863 5.863 5.863 TI/(Nb+Ta) 2.688 4.181 2.688 2·&88 2.668 2.688 2.688 W/Sn 1.000 1.000 1.000 1.000 1.000 1.000 1,000 Mg+Ga+Sr+Ba+Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li + Na + K 0.285 0.285 0.285 0.285 0.285 0.285 0.285 B+Zn+W+Li 10.948 10.948 10.882 10.882 10.882 10.882 .10.882 (Si+Ge+Ta+Nb)/ (Bt-Zn+W+Li) 0.953 0.783 0.959 0.959 0.959 0.959 0.959 2.00102 2.00054 2.00186 2.00197 2.00180 2.00201 2.00221 28.3 28.4 28.3 28.3 28.2 28.3 28.2 flg.F 0.6030 0.6030 0.6025 0.6028 0.6028 0.6026 0.6031 ^ 70 460.5 464 458.5 459 467 468 467 Λ 3 371 371.5 371 371 372.5 372 371.5 Liquid temperature 1140 1160 1140 Ί 140 1120 1140 1120 161736.doc -36-

201236993 [Table 6] Example 39 40 41 42 43 44 45 46 bz〇3 9.932 9.932 9.932 9.932 9.932 9.932 9.932 9.932 TI〇2 15.758 15.758 15.758 15.758 15.758 15.758 15.758 15.758 Nb2Os 5.863 5.863 5.863 5.863 5.863 5.863 5.863 5.863 La2〇3 51.549 42.998 43.538 40.622 38.247 35.872 33.496 49.239 sio2 4.572 4.572 4.572 4.572 4.572 4.572 4.572 4.572 Zr02 5.653 5.653 5.653 5.653 5.653 5.653 5.653 5.653 G〇〇2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta4 Oa 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W03 0.665 0.665 0.665 0.665 0.665 0.665 0.665 0.665 Sn02 0.665 0.665 0.665 0.665 0.665 0.665 0.665 0.665 Gda03 5.041 13.592 13.052 1 5.968 18.343 20.718 23.094 7.351 Y2〇3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 2nO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0 .000 LfzO 0.285 0.285 0.285 0.285 0.285 0.285 0.285 0.285 NazO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 k2o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ai2o3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Sb203 0.017 0.01 7 0.017 0,017 0.017 0.017 0.017 0.017 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La + Gd+Y + Yb + Lu 56.590 56.590 56.590 56.590 56.590 56.590 56.590 56.590 (La + Gd+Y+Yb+Lu)/Ti 3.591 3.591 3.591 3.591 3.591 3.591 3.591 3.591 Ti+Nb 21.621 21.621 21.621 21.621 21.621 21.621 21.621 21.621 (Ge+Ta)/(Ti + Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb + Ta 5.863 5.363 5.863 5.863 5.863 5.863 5.863 5.863 Ti/(Nb+Ta) 2.688 2.686 2.688 2.688 2.688 2.688 2.688 2.688 W/Sn 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 Mg+Ca+Sr+Ba+Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li+Na+K 0.285 0.285 0.285 0.285 0.285 0.285 0.285 0.285 B+Zn+W+U 10.882 10.862 10.882 10.882 10,882 10.862 10.882 10.882 (Si+Ge+Ta+Nb)/ (Β+Ζπ+ W+U) ' 0.959 0.959 0.959 0.959 0.95» 0.959 0.959 0.959 2.00220 2.00215 2.0021 1 2.00160 2.00140 2.00138 2.00106 2.00245 28.3 28.2 28.2 28.2 28.1 28.1 28.1 28.3 0g, F 0.6023 0.3035 0.6031 0.6030 0.6031 0.6032 0.6037 0.6025 and 70 466 467 470 460.5 459.5 470.5 464.5 469.5 and S 371 372.5 372 372 371.5 373 372.5 372 Liquidus temperature 1120 1100 1100 1110 1120 1100 1100 37- 161736.doc 201236993 [Table 7] Example Reference Example 47 48 49 50 51 52 1 B2〇3 9.932 9.998 9.95Ϊ 9.428 9.125 9.341 10.084 TiOg 15.758 14.808 13.361 11.^67 11.582 13.540 14.832 NbaOs 5.863 7.732 8.129 9.602 12.051 8.053 8.238 La203 46.389 47.713 49.438 49.255 48.129 50.101 47.469 Si08 4.572 4.572 4.825 4.572 4.425 4.787 4.890 2rOa 5.653 5.653 5.967 5.653 5.471 5.923 6.047 GeO 2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ta2Os 0.000 0.000 0.000 0.000 0.000 0.000 0.000 wo3 0.665 0.665 0.000 0.665 0.644 0.000 0.000 Sn02 0.665 0.665 0.000 0.&65 0.644 0.000 0.000 Gd2Oa 10.201 7.351 7.759 7.351 7.114 7.688 7.863 Y 2〇3 0.000 0.541 0.570 0.541 0.523 0.568 0.578 MgO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 CaO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SrO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 BaO 0.000 0.000 0.000 0.000 0.000 0.000 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 U2o 0.285 0.285 0.000 0.285 0.276 0.000 0.000 NazO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 k8o 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ai2o3 0.000 0.000 0.000 0.000 0.000 0.000 Sb203 0.017 0.017 0.000 0.017 0.017 0.000 0.000 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La + Gd+Y + Yb + Lu 56.590 55.605 57.767 57.147 55.788 58.357 55.910 (Le + Gd + Y+Yb + Lu)/Ti 3.591 3.755 4.324 4.775 4.815 4.310 3.770 Ti+Nb 21.621 22.540 21.490 21.569 23.633 21.593 23.070 23.070 (Ge + Ta)/ (Ti+Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Nb + Ta 5.863 7.732 8.129 Θ.&02 12.051 8.053 8.238 Ti/(Nb+Ta) 2.688 t.915 1.644 1.246 0.9Θ1 1.681 1.800 W/Sn 1.000 1.000 - 1.000 1.000 - - Mg+Ca+Sr+Ba+Zn 0. 000 0.000 0.000 0.000 0.000 0.000 0.000 Li + Na + K 0.285 0.285 0.000 0.285 0.276 0.000 0.000 B+Zn+W+Li 10.882 10.94S 9.951 10.378 10.045 9.341 10.084 (Si+Ge+Ta+Nb)/ (B+Zn+W +Li) 0.959 1.124 1.302 1.366 1.640 1.375 1.302 nd 2.00189 2.00148 1.99458 1.99591 2.00491 2.00Π3 2.00215 28.2 28.3 29.1 29.3 28.7 29 28.2 flg.F 0.6026 0.6025 0.5996 0.6030 and 70 464.5 477 429 430 434.5 419.5 501 Λ b 371.5 373 364 364 3Θ5. 5 363.5 387.5 Liquidus temperature 38-161736.doc 201236993 [Table 8] Example Reference Example 53 54 2 3 b2〇3 10.324 1 1.947 4.980 4.990 ΤίΟ£ 16.380 15.412 10.458 10.479 Nb2Os 3.000 5.920 9.462 9.481 La203 45.258 40.626 47.809 47.904 Si02 3.765 4.617 Θ.474 5.988 Zr02 5.877 5.708 6.375 6.387 GeOg 0.988 Ta20B 2.108 5.976 5.988 W〇3 0.691 0.672 Sn〇2 0.691 0.672 0.499 Gd203 10.604 7.423 7.570 7.585 Y2〇3 0.498 0,499 MgO CaO SrO BaO 1.919 ZnO 4.797 Li£0 NaaO 0.296 k2o 0.286 ai2o3 Sb203 0.018 Asg〇3 0.398 0.200 100.00 100.00 100.40 100.20 La+Gd+Y+Yb+Lu 55.86 48.05 55.88 55.99 (La + Gd+Y+Yb+Lu)/Ti 3.410 3.118 5.343 S.343 Ti + Nb 19.38 21.33 19.92 19.96 (Ge+Ta)/ (Ti+Nb) 0.160 0.000 0.300 0.300 Nb + Ta 5.1 1 5.92 15.44 15.47 Ti/(Nb+Ta) 3.207 2.603 0.677 0.677 W/Sn 1.000 1.000 - 0.000 Mg+Ce+Sr+Ba+Zn 0.00 6.72 0.00 0.00 Li + Na + K 0.30 0.29 0.00 0.00 B+Zn+W+Li 11.015 17.416 4.980 4.990 (Si+Ge+Ta+Nb)/ (B+Zn+W+Li) 0.B95 0.605 4.400 4.300 1.99604 1.97063 2.02365 28.3 2S.5 Devitrification 29 9 gF 0.6040 0-6037 0.5980 70 459 494 446.5 451 A 5 371.5 372.5 365 365 Liquidus temperature 1080 1080 1300 1300 39-161736.doc 201236993 [Table 9] Example 55 56 57 58 60 61 62 63 B2 〇3 9.952 10.246 9.550 9.060 1 2.450 12.450 9.958 9.958 Ti〇ij 1 6.467 16.481 14.500 13.800 1 4.900 15.500 16.907 16.077 Nb205 4.593 4.597 8.700 8.100 8.310 7.610 4.839 4.669 L a 2 〇3 47.612 47.366 55.300 47.000 52.710 47.330 48.841 48.041 SIOa 4.612 4.616 5.020 4.820 2.350 2.200 4.609 4.609 Zr02 5.702 5.707 5 .800 5.800 5.600 5.800 5.799 5.799 G θ O 2 T a 2 〇e WOa 0.671 0.671 1.100 3.040 1.100 1.000 1.000 1.000 Sn〇2 G d 2 O 3 10.29 10.299 Y2〇3 8.300 2.300 8.030 8.029 8.928 MgO CaO SrO BaO ZnO Li20 Na20 K2o Al2〇3 . S b 2 O 3 0.101 0.017 0.030 0.080 0.080 0.080 0.018 0.018 TOTAL 100.00 100.00 100.00 100.00 100.00 100.00 100.00 100.00 La + Gd+Y+Yb + Lu 57.902 57.665 55.300 55.300 55.01 55.36 56.87 56.969 (La+Gd+Y +Yb+Lu)/Ti 3.516 3.499 3.814 4.007 3.692 3.572 3.364 3.356 Ti + Nb 21.060 21.078 23.200 21.900 23.210 23.1 10 21.746 21.646 (Ge+Ta)/(Ti+Nb) 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 N b + Ta 4.593 4.597 8.700 8.100 8.310 7.610 4.839 4.669 Ti/(Nb + Ta) 3.585 3.585 1.667 1.704 1.793 2.037 3.494 3.636 W/Sn Mg+Ca+Sr+Ba+Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li + Na + K 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 B + 2n+W + Li 10.623 10.917 10.650 12.100 1 3.550 1 3.450 10.958 10.958 (Si + Ge + Ta + Nb) / (B + Zn+W + Li) 0.867 0.844 1.288 1.068 0.787 0.729 0.862 0.847 nd 2.00293 2.00108 2.00658 2.00376 1.99976 2.00134 2.0029 2.0017 28.3 28.3 28.1 28.5 28.5 28.3 28.3 28.3 Θ gF 0.6030 0.6031 0.6030 0.6017 0.6019 0.6038 0.6033 0.6027 and TO 462.5 448.5 469 466 452.5 462.5 486.5 464 As 377.5 370 373.5 378.5 376 376.5 371.5 372 Liquid temperature 1120 1110 1110 1110 161736.doc -40-

201236993 The optical glass of the embodiment of the present invention has an Abbe number (Vd) of 3 Å or less, and the Abbe number (Vd) is 22 or more, and more specifically 28 or more, which is within a desired range. Further, the partial dispersion ratio of the optical glass of the embodiment of the present invention, F) is 0.61 5 or less, more specifically 0.604 or less. Therefore, it has been clarified that the optical glass of the embodiment of the present invention has low dispersion and a small partial dispersion ratio (9g'F), which can reduce chromatic aberration when forming an optical element. Further, the refractive index (nd) of the optical glass of the embodiment of the present invention is 丨9 〇 or more, more specifically 1.98 or more, and the refractive index (nd) is 22 Å or less, and more specifically 2.01 or less. 'In the range expected. Further, λ7 光学 (wavelength at a transmittance of 7〇%) of the optical glass of the embodiment of the present invention is 520 nm or less, and more specifically 487 nm or less. Further, the wavelength of the optical glass having a transmittance of 5% according to the embodiment of the present invention is 420 nm or less, and more specifically, 379 〇〇 1 or less is within a desired range. On the other hand, the glass of the reference example (No. 1) was 7 〇 1 nm. Therefore, it has been clarified that the optical glass of the embodiment of the present invention has a higher transmittance to visible light and less coloration than the glass of the reference example (No. 1}. Further, the optical glass of the present invention The liquidus temperature is 丨24〇 or less, more specifically 1220t; below, and the liquidus temperature is above 5°C, within the desired range. On the other hand, reference example (No. The liquidus temperature of the glass of 2 to No. 3) is u〇〇t, and especially the glass of the reference example (No. 2) is devitrified. Therefore, it has been clarified: and the reference example (Νο·2~Νο·3) The glass phase & 'present invention<> The optical glass of the embodiment has a high resistance to devitrification. 161736.doc 41 201236993 Therefore, the refractive index (nd) and Abbe number (vd) of the optical glass of the embodiment of the present invention Within the desired range, and the chromatic aberration is small, the transparency to the light of the wavelength of the visible region is high, and the devitrification resistance is high. Further, using the optical glass obtained in the embodiment of the present invention After hot extrusion molding, it is polished and polished to be processed into a shape of a lens and a crucible. The optical glass of the embodiment of the present invention forms a preform for precision extrusion molding, and performs precision extrusion molding on the preform for precision extrusion molding. In either case, no whitening occurs in the glass after heating and softening. And the problem of devitrification, etc., can be stably processed into various lenses and shapes of the cymbals. It is to be understood that 'the above' is explained in detail for exemplifying the present invention, but the present embodiment is only used to exemplify that 'practitioners can not leave Various changes are made within the spirit and scope of the present invention. [Simplified Schematic] FIG. 1 shows the partial dispersion ratio (eg, F) as the vertical and the Abbe number (Vd) as the horizontal axis. A diagram of the regular line. 161736.doc 42·

Claims (1)

201236993 VII. Patent application scope: 1 · An optical glass 'the total mass of the glass relative to the oxide-converted composition' contains, by mass% § 10, 1.0 to 31.0% of the B2〇3 component and 40.0 to 65.0〇 of the L112O3 component. The content of the Ti 2 component is 30.0% or less, and the content of the Nb 205 component is 30.0% or less. 2. The optical glass according to claim 1, wherein the mass ratio of the oxide-converted composition is 3.00 or more of Lri2〇3/Ti〇2 (wherein Ln is selected from the group consisting of La, Gd, Y, Yb, and Lu). One or more of them). The optical glass according to claim 1 or 2, wherein the total mass of the glass of the oxide-converted composition is contained in mass% of La2〇3 component 18 〇~6〇 〇0/. . 4. The optical glass according to any one of claims 1 to 3, wherein the mass and the total mass of (Ti〇2+Nb2〇5) relative to the oxide-converted composition are 8.0% or more and 35.0% or less. 5. The optical glass according to any one of claims 1 to 4, wherein the total mass of the glass in terms of the oxide-converted composition, in terms of mass%, further comprises the following components: Si 〇 2 component 0 to 20.0%, and / Or Zr02 composition 〇 ~15.0%. 6. The optical glass according to claim 5, wherein the total mass of the glass in terms of the oxide-converted composition is 1% by mass or more based on the mass% of the Si 2 component. The optical glass according to claim 5 or 6, wherein the total mass of the glass relative to the oxide-converted composition is more than 3 % by mass based on the Zr 〇 2 component. 8. As requested! The optical glass according to any one of the items 7, wherein the total mass of the glass relative to the oxide conversion composition is 0.001736.doc 201236993 Ge〇2 component is 0 to 10.0%, and/or the Ta2〇5 component is 0% by mass. ~20.0〇/〇. 9. The optical glass of claim 8, wherein the mass ratio (Ge〇2+Ta2〇5)/(Ti〇2+Nb205) in the oxide-converted composition is 1.00 or less. The optical glass according to any one of claims 1 to 9, wherein the mass and (Nb2〇5+Ta2〇5) are from 3.0% to 30.0% by mass based on the total mass of the oxide-converted composition. The optical glass according to any one of claims 1 to 10, wherein a mass ratio of Ti02/(Nb205+Ta205) in the oxide-converted composition is 〇.8〇 or more. The optical glass according to any one of the preceding claims, wherein the total mass of the glass in terms of oxide conversion is in mass%, w〇3 is 〇10.0%, and/or Sn〇2 The composition is 0 to 5.0%. 13. The optical glass of claim 12, wherein the W?3 component is more than 0.5% based on the total mass of the glass in terms of oxide conversion. 14. The optical glass according to any one of the preceding claims, wherein the total mass of the glass in terms of oxide conversion is 0% to 30.0% by mass%, and/or the Y2O3 component is 0% by mass. ~20.0%, and/or Yb2〇3 components are 0 to 6.0%, and/or Lu2〇3 components are 〇~6.0%. 15. The optical glass according to any one of claims 1 to 14, wherein the total mass of the glass of the hexagram relative to the oxide conversion composition is, by mass%, the MgO component is 〇15%, and/or I61736.doc 201236993 CaO composition is 〇~15 〇%, and/or SrO component is 〇~15.〇%, and/or BaO component is 〇~35 〇%, and/or ZnO component is 〇~15 〇%. 16. The optical glass of claim 15, wherein the R 〇 component (the eight-character is selected from the group consisting of ^§, 0&, 81', ugly & one or more) The total mass of the glass in terms of oxide conversion is 35.0% or less. The optical glass according to any one of claims 1 to 16, wherein the Li2〇 component is 〇15.0% by mass, and/or the Na2〇 component is 〇, by mass%, based on the total mass of the glass of the oxide conversion composition. ~15.0%, and / or K2〇 composition is 〇~15.0%. 18. The optical glass of claim 17, wherein the mass of the component (wherein Rn is one or more selected from the group consisting of Li, Na, and K) and the total mass of the glass in terms of oxide conversion are 1 〇·0% or less. 19. The optical glass of any one of the preceding claims, wherein the total mass of the glass is converted to mass relative to the oxide. /. The P2O5 component is 0 to 10.0%, and/or the Bi2〇3 component is 〇10.0%, and/or the Te〇2 component is 〇10.〇%, and/or the Al2〇3 component is 0~10.0%. And/or the Ga2〇3 component is 0 to 10.0%, and/or the Sb2〇3 component is 0 to 1.0%. The optical glass of any one of claims 1 to 19 which has a refractive index (nd) of 161736.doc 201236993 of 1.80 or more and an Abbe number (vd) of 22 or more and 30 or less. The optical glass according to any one of claims 1 to 20, which has a partial dispersion ratio (0g, F) of 0.615 or less. 22. A preformed article comprising the optical glass of any one of claims 1 to 21. 23. An optical component produced by extrusion molding a preform of claim 22. An optical element which is an optical glass according to any one of claims 1 to 21 as a base material. 25. An optical machine comprising the optical component of any one of claims 23 or 24. 16l736.doc -4-