JPH0826765A - Optical Glass - Google Patents

Optical Glass

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Publication number
JPH0826765A
JPH0826765A JP15630194A JP15630194A JPH0826765A JP H0826765 A JPH0826765 A JP H0826765A JP 15630194 A JP15630194 A JP 15630194A JP 15630194 A JP15630194 A JP 15630194A JP H0826765 A JPH0826765 A JP H0826765A
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Prior art keywords
optical glass
molding
zno
glass
obtain
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JP15630194A
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Japanese (ja)
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JP3458462B2 (en )
Inventor
Kazuhiro Kido
一博 木戸
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Nikon Corp
株式会社ニコン
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/12Silica-free oxide glass compositions
    • C03C3/14Silica-free oxide glass compositions containing boron
    • C03C3/15Silica-free oxide glass compositions containing boron containing rare earths

Abstract

PURPOSE:To obtain optical glass having desired optical constants, excellent in chemical durability and stability to devitrification and useful for molding with no environmental pollution by imparting a compsn. contg. prescribed amts. of B2O3, Li2O, ZnO and La2O3 as essential components. CONSTITUTION:A mixture is prepd. by mixing, by weight., 20-30% B2O3, 0.1-2.5% Li2O, 1-19.5% ZnO and 16-42% La2O3 as essential components with 0-5% SiO2, 0-5% Al2O2, 0-5% Na2O, 0-5% K2O, 0-5% MgO, 0-10% CaO, 0-10% SrO, 0-10% BaO 0-10% Y2O3, 0-10% Yb2O3 0-10% Nb2O5 0-8% ZrO2, 0-25% Gd2O3 0-15% Ta2O3 0-1% As2O3 and 0-1% Sb2O3 as optional components. The mixture is melted to obtain the objective optical glass having a refractive index (nd) of 1.68-1.80, an Abbe number (nud) of 44-53 and <=630 deg.C deformation temp. (At).

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、B 23 −Li 2 O−Z The present invention relates, B 2 O 3 -Li 2 O -Z
nO−La 23の基本組成系からなり、屈折率(nd) made from the basic composition system of nO-La 2 O 3, the refractive index (nd) of
が約1.68〜1.80、アッベ数(νd)が約44〜 But about 1.68 to 1.80, the Abbe number (νd) is about 44
53である光学ガラスに関する。 An optical glass which is 53. さらに、本発明による光学ガラスは、低温での成形が可能であり、特にモールド成形に有用な光学ガラスに関する。 Further, the optical glass according to the present invention can be molded at a low temperature, an optical glass useful particularly molding.

【0002】 [0002]

【従来の技術】近年、光学系を使用する機器の高集積化、高機能化が進められる中で、光学系に対する高精度化、軽量・小型化の要求が強く、この要求を実現するために非球面レンズを使用した光学設計が主流となりつつある。 In recent years, high integration of devices using an optical system, in which higher functionality proceeds, a high precision for the optical system, a request for lighter and smaller is strong, in order to realize this request optical designs using aspherical lenses are becoming the mainstream. このため、非球面レンズを低コストで大量に安定供給することが必要となり、高精度な金型の面をガラス素材(軟化状態のゴブ、研磨後の平面ガラスまたは球面ガラスを軟化状態にしたもの)に加圧転写して、最終的な研削・研磨工程を要しないで所定の性能を有するレンズを得るモールド成形技術が盛んに研究されるようになった。 Therefore those, it is necessary that a large amount stably supplied aspherical lenses at a low cost, in which the surface of high-precision mold glass material (in softened gob, softened flat glass or spherical glass after polishing ) to be copy pressure transfer, molding technique to obtain a lens having a predetermined performance without requiring a final grinding and polishing process came to be widely studied. さらに、非球面レンズに限らず、複雑な形状を有するレンズについてもモールド成形技術が研究されるようになってきている。 Furthermore, not only the aspheric lens molding technology for lenses having a complex shape has come to be studied. それに伴って、モールド成形に適した光学ガラスの開発に対する要求も年々高まってきている。 Along with this, there has been increasing year by year demand for the development of an optical glass suitable for mold forming.

【0003】上記光学恒数を有する光学ガラスとしては、B 23 、La 23を必須成分とする種々のガラスが古くから知られている。 [0003] As an optical glass having a number of the optical constants, various glasses which the B 2 O 3, La 2 O 3 as essential components has been known for a long time. しかし、従来のB 23 −La 2 However, the conventional B 2 O 3 -La 2
3を必須成分とする光学ガラスは、いずれも化学的耐久性や耐失透性の向上に重点がおかれており、熱間成形性については十分な配慮が成されておらず、モールド成形に適しているとは言い難い。 Optical glass for the O 3 as an essential component, any improvement in chemical durability and devitrification resistance and emphasis is placed, not sufficient consideration has been made for the hot formability, molding it is difficult to say that is suitable for. さらに、これらの光学ガラスは、一般に高い屈伏点を持つため、加熱成形時の成形温度は650℃以上となり、高精度の金型の劣化を招き易く、精度の高いレンズ面を実現することも困難となる。 Furthermore, these optical glasses are generally high due to its deformation point, the molding temperature during hot forming becomes 650 ° C. or higher, easily lead to deterioration of mold precision, even difficult to achieve a high lens surface accuracy to become.

【0004】そこで、低い屈伏点を持つモールド成形用光学ガラスとして、B 23 、Li 2 O、La 23を主成分とする種々の光学ガラスが開発され開示されている。 [0004] Therefore, as an optical glass for molding with low deformation point, various optical glass B 2 O 3, Li 2 O , the La 2 O 3 as a main component is disclosed developed.
例えば、特開平4−92834号は、nd=1.622 For example, JP-A-4-92834, nd = 1.622
〜1.701、νd=45.3〜55.1を特徴とし、 ~1.701, features a νd = 45.3~55.1,
実施例においてAt=504〜549℃である光学ガラス、特開平4−92835号は、nd=1.740〜 Optical glass is At = 504~549 ℃ in the examples, Japanese Patent Laid-Open No. 4-92835, nd = 1.740~
1.785、νd=38.0〜47.0、Atが570 1.785, νd = 38.0~47.0, At 570
℃以下(実施例At=500〜569℃)を特徴とする光学ガラス、特開平5−58669号は、nd=約1. ° C. or less (Examples At = 500-569 ° C.) optical glass, characterized in, Japanese Patent Laid-Open No. 5-58669, nd = about 1.
63〜1.75、νd=約45〜60、At=555〜 63~1.75, νd = about 45~60, At = 555~
640℃を特徴とする光学ガラス、特開平5−2017 Optical glass characterized by 640 ° C., JP 5-2017
43号は、nd=1.65〜1.75、νdが50以上でAt=560℃以下を特徴とする光学ガラス等である。 43 issue, nd = 1.65~1.75, νd is an optical glass characterized by less At = 560 ° C. over 50.

【0005】特開昭62−87432号は、アッベ数は開示されていないが、nd=1.690〜1.725、 [0005] JP-A-62-87432, which is not the Abbe number are disclosed, nd = 1.690~1.725,
At=570℃以下で、PbOを含んだ比較的低温での精密プレスが可能な光学ガラスである。 At = 570 ° C. or less, an optical glass which enables precise pressing at a relatively low temperature containing PbO.

【0006】 [0006]

【本発明が解決しようとする課題】しかし、上記従来の光学ガラス、特にモールド成形用光学ガラスは、加熱成形時にガラス組成中の特定元素が揮発し、金型に付着することにより、高精度なモールド成形を困難にするという問題点があった。 A present invention is to provide, however, the conventional optical glass, optical glass, particularly for molding, by specific elements in the glass composition is volatilized during heating molding, it adheres to the mold, precision disadvantageously difficult molding. また、分析等の結果から、金型に付着する元素は、主に、低屈伏点を実現するために含有させた比較的多量のアルカリ金属酸化物または酸化鉛であることがわかっている。 Further, from the results of analysis, etc., elements attached to the mold mainly has been found that a relatively large amount of alkali metal oxides or lead oxide which is contained in order to achieve a low deformation point.

【0007】これらの元素は高精度なモールド成形を困難にするだけでなく、多量のアルカリ金属酸化物は化学的耐久性を低下させ、酸化鉛は製造工程で環境汚染につながるという問題点もある。 [0007] These elements not only makes it difficult to accurately molded, a large amount of alkali metal oxides reduce the chemical durability, lead oxide is also a problem that leads to environmental pollution in the manufacturing process . そこで本発明は、上記した従来の光学ガラス、特にモールド成形用光学ガラスの諸問題に鑑みてなされたものである。 The present invention, conventional optical glass described above, is made in particular in view of the problems of optical glass for molding.

【0008】本発明の目的は、屈折率(nd)が1.6 An object of the present invention, the refractive index (nd) of 1.6
8〜1.80、アッベ数(νd)が44〜53の光学恒数を持ち、屈伏点がモールド成形に適した630℃以下であり、さらにモールド成形中に多量のガラスの組成成分が揮発することなく、化学的耐久性、失透に対する安定性に優れ、環境汚染のない新規な光学ガラスを提供することである。 8 to 1.80, has optical constants of Abbe's number ([nu] d) is from 44 to 53, sag is not more than 630 ° C. which is suitable for molding, the composition component of a large amount of glass is volatilized during further molding without chemical durability, excellent stability against devitrification is to provide a novel optical glass with no environmental pollution.

【0009】 [0009]

【課題を解決するための手段】本発明者は、上記目的を達成するために鋭意研究を重ねた結果、B 23 、Li The present inventors Means for Solving the Problems] As a result of extensive studies to achieve the above object, B 2 O 3, Li 2 2
O、ZnO、La 23を必須成分とする光学ガラス組成が、所定の組成範囲内において所望の光学恒数とモールド成形に適した屈伏点を持ち、さらにモールド成形中にガラスの組成成分が揮発することなく、優れた化学的耐久性、失透に対する安定性を実現できることを見い出し、本発明を成すに至った。 O, ZnO, optical glass composition as essential components La 2 O 3 is within a predetermined composition range has a desired optical constants and yield point suitable for molding, it is further composition components of the glass during molding without volatilized, excellent chemical durability, it found that can achieve the stability against devitrification and accomplished the present invention. すなわち、本発明は、重量比(wt%)で、 SiO 2 0 〜 5 wt% B 23 20 〜 30 wt% Al 23 0 〜 5 wt% Li 2 O 0.1〜 2.5wt% Na 2 O 0 〜 5 wt% K 2 O 0 〜 5 wt% 但し、Li 2 O+Na 2 O+K 2 O 0.1〜 7.0wt% MgO 0 〜 5 wt% CaO 0 〜 10 wt% SrO 0 〜 10 wt% BaO 0 〜 10 wt% ZnO 1 〜 19.5wt% ZrO 2 0 〜 8 wt% La 23 16 〜 42 wt% Gd 23 0 〜 25 wt% Y 23 0 〜 10 wt% Yb 23 0 〜 10 wt% Nb 25 0 〜 10 wt% Ta 25 0 〜 15 wt% As 23 0 〜 1 wt% Sb 23 0 〜 1 wt% から成る組成を有し、屈折率(nd)が1.68〜1. That is, the present invention is, in a weight ratio (wt%), SiO 2 0 ~ 5 wt% B 2 O 3 20 ~ 30 wt% Al 2 O 3 0 ~ 5 wt% Li 2 O 0.1~ 2.5wt% Na 2 O 0 ~ 5 wt% K 2 O 0 ~ 5 wt% , however, Li 2 O + Na 2 O + K 2 O 0.1~ 7.0wt% MgO 0 ~ 5 wt% CaO 0 ~ 10 wt% SrO 0 ~ 10 wt % BaO 0 ~ 10 wt% ZnO 1 ~ 19.5wt% ZrO 2 0 ~ 8 wt% La 2 O 3 16 ~ 42 wt% Gd 2 O 3 0 ~ 25 wt% Y 2 O 3 0 ~ 10 wt% Yb 2 O 3 has a 0 ~ 10 wt% Nb 2 O 5 0 ~ 10 wt% Ta 2 O 5 0 ~ 15 wt% As 2 O 3 0 ~ 1 wt% Sb 2 O 3 0 ~ composition comprising a 1 wt%, refractive index (nd) of 1.68 to 1.
80、アッベ数(νd)が44〜53、屈伏点(At) 80, Abbe number (νd) is 44-53, yield point (At)
が630℃以下であることを特徴とするモールド成形用光学ガラスを提供する。 To provide an optical glass for molding, characterized in that but is 630 ° C. or less.

【0010】 [0010]

【作用】上記組成範囲は、実験化学的に見い出されたものであり、組成範囲限定の理由は次の通りである。 [Action] The above composition range has been found experimentally chemically, for reasons of composition range limitation is as follows. Si Si
2はガラス形成酸化物であり、失透に対する安定性を向上させるが、5wt%を越えると、未溶物が生じ易くなり、溶融温度及び屈伏点を上昇させる。 O 2 is a glass forming oxide, improves the stability against devitrification, exceeds 5 wt%, tends to occur is not yet solubles increases the melting temperature and yield point.

【0011】B 23はSiO 2と同様にガラス形成酸化物であり、本発明において必須成分である。 [0011] B 2 O 3 is a glass forming oxide in the same manner as SiO 2, is an essential component in the present invention. 20wt% 20wt%
未満では失透に対して十分な安定性を得られないが、3 Although not obtain sufficient stability against devitrification is less than, 3
0wt%を越えると屈折率が低下し、化学的耐久性を低化させる。 Exceeding 0 wt% and a refractive index is lowered, thereby Tayca chemical durability. Al 23は失透に対する安定性、化学的耐久性を向上させるが、5wt%を越えると屈伏点を上昇させる。 Al 2 O 3 is stability against devitrification, improves the chemical durability, increase the yield point and exceeds 5 wt%.

【0012】Li 2 Oは他のアルカリ金属酸化物に比べて大幅な屈折率低下、化学的耐久性の低下を伴うことなく、溶融温度及び屈伏点を低下させる必須成分であるが、0.1wt%未満では十分な効果が得られず、2. [0012] Li 2 O is reduced significantly refractive index as compared with other alkali metal oxides, without a decrease in chemical durability, is an essential component for lowering the melting temperature and yield point, 0.1 wt sufficient effect can not be obtained is less than%, 2.
5wt%を越えると化学的耐久性及び失透に対する安定性が低下する。 Stability to chemical durability and devitrification decreases exceeds 5 wt%. さらに、Li 2 Oは成形時に揮発して成形型に付着し易く、高精度なモールド成形が困難になる。 Further, Li 2 O tends to adhere to the mold by volatilization during molding, it is difficult to accurately molded.

【0013】Na 2 O、K 2 Oは溶融温度及び屈伏点を低下させるが、5wt%を越えると屈折率が低下し、化学的耐久性及び失透に対する安定性も低下する。 [0013] Na 2 O, K 2 O is to lower the melting temperature and yield point, and decreases the refractive index exceeds 5 wt%, is also decreased stability to chemical durability and devitrification. さらに、 further,
Na Na 2 O、K 2 Oは成形時に揮発して成形型に付着し易く、高精度なモールド成形が困難になる。 2 O, K 2 O tends to adhere to the mold by volatilization during molding, it is difficult to accurately molded. 但し、Li 2 However, Li 2
O、Na 2 O、K 2 Oの合計量として、7.0wt%を越えると、屈折率が低下し、化学的耐久性及び失透に対する安定性も低下する。 O, the total amount of Na 2 O, K 2 O, exceeds 7.0 wt%, the refractive index decreases, also decreases stability to chemical durability and devitrification. さらに、これらアルカリ金属酸化物は成形時に揮発して成形型に付着し易く、高精度なモールド成形が困難になる。 In addition, these alkali metal oxides are easily attached to the mold by volatilization during molding, it is difficult to accurately molded.

【0014】MgOは溶融温度を低下させるが、5wt [0014] MgO lowers the melting temperature but, 5wt
%を越えると失透に対する安定性が低下し、分相傾向も増大する。 % Stability is lowered against devitrification exceeds, phase separation tendency also increases. CaO、SrO、BaOは屈折率の調整、失透に対する安定性向上に有用であるが、10wt%を越えると逆に失透傾向が増大し、化学的耐久性を低下させる。 CaO, SrO, BaO adjustment of refractive index, is useful for improving stability against devitrification, devitrification tendency increases conversely exceeds 10 wt%, reduce the chemical durability.

【0015】ZnOは溶融温度及び屈伏点を低下させ、 [0015] ZnO lowers the melting temperature and yield point,
屈折率の調整にも有効な必須成分であるが、1wt%未満では十分な効果が得られず、19.5wt%を越えると分散が大きくなり、失透に対する安定性が低下し、化学的耐久性も低下する。 Is an effective essential ingredient to adjust the refractive index, sufficient effect can not be obtained is less than 1 wt%, dispersion and exceeds 19.5 wt% increases the stability against devitrification is deteriorated, the chemical durability sex is also reduced. ZrO 2は失透に対する安定性、化学的耐久性を向上させるが、8wt%を越えると、逆に失透傾向が増大し、屈伏点も上昇する。 ZrO 2 stability against devitrification, improves the chemical durability, exceeds 8 wt%, inverse devitrification tendency is increased, even elevated yield point.

【0016】La 23は比較的に失透に対する安定性を低下させることなく、屈折率を高くし、化学的耐久性を向上させる必須成分であるが、16wt%未満では十分な効果が得られず、42wt%を越えると失透に対する安定性が低下し、屈伏点も上昇する。 [0016] La 2 O 3 is without decreasing the stability against devitrification relatively, the refractive index was high, but an essential component for improving the chemical durability, give a sufficient effect is less than 16 wt% is not, stability is lowered against devitrification exceeds 42 wt%, also it increases yield point. Gd 23は比較的に失透に対する安定性を低下させることなく、屈折率を高くし、化学的耐久性を向上させるが、25wt%を越えると失透に対する安定性が低下し、屈伏点も上昇する。 Gd 2 O 3 without decreasing the stability against devitrification relatively, the refractive index increased, improves the chemical durability, stability is lowered against devitrification exceeds 25 wt%, the yield point also it rises.

【0017】Y 23 、Yb 23は屈折率を高くし、化学的耐久性を向上させるが、10wt%を越えると失透に対する安定性が低下し、屈伏点も上昇する。 [0017] Y 2 O 3, Yb 2 O 3 is higher refractive index, improves the chemical durability, stability is lowered against devitrification exceeds 10 wt%, also increases yield point. Nb 25 Nb 2 O 5,
Ta 25は屈折率を高くし、化学的耐久性を向上させるが、それぞれ10wt%、15wt%を越えると分散を大きくし、失透に対する安定性も低下する。 Ta 2 O 5 is a higher refractive index, improves the chemical durability, 10 wt%, respectively, to increase the dispersion and exceeds 15 wt%, also decreases the stability against devitrification.

【0018】As 23 、Sb 23は脱泡剤としてして用いるが、1wt%以下で十分な効果を得ることができる。 [0018] As 2 O 3, Sb 2 O 3 is used by a defoaming agent, but it is possible to obtain a sufficient effect with less 1 wt%. また、Sb 23は1wt%を越えるとガラスに着色が認められる。 Further, Sb 2 O 3 is observed colored glass exceeds 1 wt%.

【0019】 [0019]

【実施例】以下、本発明を実施例によりさらに具体的に説明するが、本発明はこれらの例に限定されるものではない。 EXAMPLES Following is a more detailed explanation of the present invention through examples, but the invention is not limited to these examples. 本発明に係る実施組成例(数値はwt%)を、光学恒数(nd,νd)及び屈伏点(At、数値は℃)とともに表1、表2に示す。 Implementation composition example according to the present invention (figures wt%), Table 1 together with optical constants (nd, [nu] d) and yield point (At, numbers ° C.), it is shown in Table 2.

【0020】本発明に係る光学ガラスは、各成分の原料として各々相当する酸化物、炭酸塩、硝酸塩等を使用し、所望の割合に秤量し、粉末で十分に混合して調合原料と成し、これを例えば1100〜1300℃に加熱された電気炉中の白金坩堝に投入し、溶融清澄後、撹拌均質化して予め加熱された鉄製の鋳型に鋳込み、徐冷して製造することができる。 The optical glass according to the present invention, each corresponding oxides as a raw material of each component, carbonates, using nitrate, weighed to the desired proportions, thoroughly mixed to form a formulation material powder , which was put into a platinum crucible of electrical furnace heated for example to 1100 to 1300 ° C., after melting refining, cast into preheated iron mold stirring homogenized, can be produced by gradually cooling.

【0021】 [0021]

【表1】 [Table 1]

【0022】 [0022]

【表2】 [Table 2]

【0023】 [0023]

【発明の効果】以上の通り、本発明によれば屈折率(n [Effect of the Invention] As described above, the refractive index according to the present invention (n
d)が1.68〜1.80、アッベ数(νd)が44〜 d) is from 1.68 to 1.80, the Abbe number (νd) is 44 to
53、屈伏点(At)が630℃以下であることを特徴とし、化学的耐久性、失透に対する安定性に優れ、環境汚染のない光学ガラスが提供される。 53, characterized in that deformation point (At) is 630 ° C. or less, chemical resistance, excellent stability against devitrification, the optical glass free of environmental pollution is provided.

【0024】しかも、本発明による光学ガラスは屈伏点が低いため、特に、高精度な金型の面をガラス素材に加圧転写して、最終的な研削・研磨工程を要しないで所定の性能を有するレンズを得るモールド成形にきわめて有用である。 [0024] Moreover, since the optical glass according to the invention has a low deformation point, in particular, the surface of high-precision mold transferred to a glass material pressure transfer, predetermined performance without requiring a final grinding and polishing process it is very useful for molding to obtain a lens having a.

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】重量比(以下wt%)で、 SiO 2 0 〜 5 wt% B 23 20 〜 30 wt% Al 23 0 〜 5 wt% Li 2 O 0.1〜 2.5wt% Na 2 O 0 〜 5 wt% K 2 O 0 〜 5 wt% 但し、Li 2 O+Na 2 O+K 2 O 0.1〜 7.0wt% MgO 0 〜 5 wt% CaO 0 〜 10 wt% SrO 0 〜 10 wt% BaO 0 〜 10 wt% ZnO 1 〜 19.5wt% ZrO 2 0 〜 8 wt% La 23 16 〜 42 wt% Gd 23 0 〜 25 wt% Y 23 0 〜 10 wt% Yb 23 0 〜 10 wt% Nb 25 0 〜 10 wt% Ta 25 0 〜 15 wt% As 23 0 〜 1 wt% Sb 23 0 〜 1 wt% の組成を有し、屈折率(nd)が1.68〜1.80、 In claim 1 the weight ratio (hereinafter wt%), SiO 2 0 ~ 5 wt% B 2 O 3 20 ~ 30 wt% Al 2 O 3 0 ~ 5 wt% Li 2 O 0.1~ 2.5wt% Na 2 O 0 ~ 5 wt% K 2 O 0 ~ 5 wt% , however, Li 2 O + Na 2 O + K 2 O 0.1~ 7.0wt% MgO 0 ~ 5 wt% CaO 0 ~ 10 wt% SrO 0 ~ 10 wt % BaO 0 ~ 10 wt% ZnO 1 ~ 19.5wt% ZrO 2 0 ~ 8 wt% La 2 O 3 16 ~ 42 wt% Gd 2 O 3 0 ~ 25 wt% Y 2 O 3 0 ~ 10 wt% Yb 2 O 3 has a 0 ~ 10 wt% Nb 2 O 5 0 ~ 10 wt% Ta 2 O 5 composition of 0 ~ 15 wt% As 2 O 3 0 ~ 1 wt% Sb 2 O 3 0 ~ 1 wt%, the refractive rate (nd) is 1.68 to 1.80,
    アッベ数(νd)が44〜53、屈伏点(At)が63 Abbe number (νd) is 44-53, yield point (At) 63
    0℃以下であることを特徴とする光学ガラス。 0 optical glass, wherein ℃ or less.
JP15630194A 1994-07-07 1994-07-07 Optical Glass Expired - Lifetime JP3458462B2 (en)

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