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JPH0826765A - Optical glass - Google Patents

Optical glass

Info

Publication number
JPH0826765A
JPH0826765A JP6156301A JP15630194A JPH0826765A JP H0826765 A JPH0826765 A JP H0826765A JP 6156301 A JP6156301 A JP 6156301A JP 15630194 A JP15630194 A JP 15630194A JP H0826765 A JPH0826765 A JP H0826765A
Authority
JP
Japan
Prior art keywords
optical glass
molding
refractive index
yield point
chemical durability
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6156301A
Other languages
Japanese (ja)
Other versions
JP3458462B2 (en
Inventor
Kazuhiro Kido
一博 木戸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikon Corp filed Critical Nikon Corp
Priority to JP15630194A priority Critical patent/JP3458462B2/en
Publication of JPH0826765A publication Critical patent/JPH0826765A/en
Application granted granted Critical
Publication of JP3458462B2 publication Critical patent/JP3458462B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/12—Silica-free oxide glass compositions
    • C03C3/14—Silica-free oxide glass compositions containing boron
    • C03C3/15—Silica-free oxide glass compositions containing boron containing rare earths

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

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、Ｂ2Ｏ3−Ｌｉ2Ｏ−Ｚ
ｎＯ−Ｌａ2Ｏ3の基本組成系からなり、屈折率（ｎｄ）
が約１．６８〜１．８０、アッベ数（νｄ）が約４４〜
５３である光学ガラスに関する。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。BACKGROUND OF THE INVENTION The present invention relates to B 2 O 3 --Li 2 O--Z.
It consists of a basic composition system of nO-La 2 O 3 and has a refractive index (nd)
Is about 1.68 to 1.80 and the Abbe number (νd) is about 44 to
53 to the optical glass. Further, the optical glass according to the present invention can be molded at a low temperature, and particularly relates to an optical glass useful for 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。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。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。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。2. Description of the Related Art In recent years, as devices using an optical system have been highly integrated and highly functionalized, there has been a strong demand for higher precision, lighter weight and smaller size of the optical system. Optical designs using aspherical lenses are becoming mainstream. Therefore, it is necessary to stably supply a large amount of aspherical lenses at low cost. Molding technology for obtaining a lens having a predetermined performance without performing the final grinding / polishing process has been actively studied. Further, not only aspherical lenses, but also molding lenses have been studied for lenses having complicated shapes. Along with this, demands for developing optical glass suitable for molding have been increasing year by year.

【０００３】上記光学恒数を有する光学ガラスとして
は、Ｂ2Ｏ3、Ｌａ2Ｏ3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。しかし、従来のＢ2Ｏ3−Ｌａ2
Ｏ3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。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。As the optical glass having the above optical constant, various glasses containing B 2 O 3 and La 2 O 3 as essential components have been known for a long time. However, the conventional B 2 O 3 -La 2
All optical glasses containing O 3 as an essential component are focused on improving their chemical durability and devitrification resistance, and their hot formability has not been fully considered. It is hard to say that it is suitable for. Further, since these optical glasses generally have a high yield point, the molding temperature during heat molding is 650 ° C. or higher, which easily causes deterioration of a highly accurate mold, and it is also difficult to realize a highly accurate lens surface. Becomes

【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、Ｂ2Ｏ3、Ｌｉ2Ｏ、Ｌａ2Ｏ3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。
例えば、特開平４−９２８３４号は、ｎｄ＝１．６２２
〜１．７０１、νｄ＝４５．３〜５５．１を特徴とし、
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〜
１．７８５、νｄ＝３８．０〜４７．０、Ａｔが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．
６３〜１．７５、νｄ＝約４５〜６０、Ａｔ＝５５５〜
６４０℃を特徴とする光学ガラス、特開平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。Therefore, various optical glasses containing B 2 O 3 , Li 2 O and La 2 O 3 as main components have been developed and disclosed as optical glasses for molding having a low yield point.
For example, Japanese Patent Laid-Open No. 4-92834 discloses nd = 1.622.
˜1.701, νd = 45.3-55.1,
In the examples, optical glass having At = 504 to 549 ° C., Japanese Patent Laid-Open No. 4-92835 discloses nd = 1.740.
1.785, vd = 38.0 to 47.0, At is 570.
Optical glass characterized by a temperature of not more than 0 ° C (Example At = 500 to 569 ° C), Japanese Patent Laid-Open No. 5-58669 discloses that nd = about 1.
63-1.75, vd = about 45-60, At = 555
Optical glass characterized by 640 ° C., JP-A-5-2017
No. 43 is an optical glass or the like characterized by nd = 1.65 to 1.75, vd of 50 or more and At = 560 ° C. or less.

【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、
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。Japanese Patent Laid-Open No. 62-87432 discloses no Abbe number, but nd = 1.690 to 1.725,
It is an optical glass containing PbO at At = 570 ° C. or lower and capable of precision pressing at a relatively low temperature.

【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。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。However, the above-mentioned conventional optical glass, particularly the optical glass for molding, has a high precision because the specific element in the glass composition volatilizes and adheres to the mold during heat molding. There is a problem that molding is difficult. Further, from the results of analysis and the like, it is known that the element attached to the mold is mainly a relatively large amount of alkali metal oxide or lead oxide contained for realizing a low yield 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。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。[0007] These elements not only make it difficult to mold with high precision, but a large amount of alkali metal oxide lowers the chemical durability, and lead oxide leads to environmental pollution in the manufacturing process. . Therefore, the present invention has been made in view of the above-mentioned problems of the conventional optical glass, particularly the optical glass for molding.

【０００８】本発明の目的は、屈折率（ｎｄ）が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。An object of the present invention is to have a refractive index (nd) of 1.6.
It has an optical constant of 8 to 1.80 and an Abbe number (νd) of 44 to 53, a yield point of 630 ° C. or lower suitable for molding, and a large amount of glass composition components volatilize during molding. It is an object of the present invention to provide a novel optical glass that is excellent in chemical durability and stability against devitrification and has 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、Ｂ2Ｏ3、Ｌｉ 2
Ｏ、ＺｎＯ、Ｌａ2Ｏ3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。すなわち、本発明は、重量
比（ｗｔ％）で、 ＳｉＯ2 ０ 〜 ５ ｗｔ％ Ｂ2Ｏ3 ２０ 〜 ３０ ｗｔ％ Ａｌ2Ｏ3 ０ 〜 ５ ｗｔ％ Ｌｉ2Ｏ ０．１〜 ２．５ｗｔ％ Ｎａ2Ｏ ０ 〜 ５ ｗｔ％ Ｋ2Ｏ ０ 〜 ５ ｗｔ％ 但し、Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ ０．１〜 ７．０ｗｔ％ ＭｇＯ ０ 〜 ５ ｗｔ％ ＣａＯ ０ 〜 １０ ｗｔ％ ＳｒＯ ０ 〜 １０ ｗｔ％ ＢａＯ ０ 〜 １０ ｗｔ％ ＺｎＯ １ 〜 １９．５ｗｔ％ ＺｒＯ2 ０ 〜 ８ ｗｔ％ Ｌａ2Ｏ3 １６ 〜 ４２ ｗｔ％ Ｇｄ2Ｏ3 ０ 〜 ２５ ｗｔ％ Ｙ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｙｂ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｎｂ2Ｏ5 ０ 〜 １０ ｗｔ％ Ｔａ2Ｏ5 ０ 〜 １５ ｗｔ％ Ａｓ2Ｏ3 ０ 〜 １ ｗｔ％ Ｓｂ2Ｏ3 ０ 〜 １ ｗｔ％ から成る組成を有し、屈折率（ｎｄ）が１．６８〜１．
８０、アッベ数（νｄ）が４４〜５３、屈伏点（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。Means for Solving the Problems The present inventor has achieved the above object.
As a result of earnest research to achieve, B2O3, Li 2
O, ZnO, La2O3Optical glass composition containing as an essential component
Is the desired optical constant and molding within the prescribed composition range.
It has a yield point suitable for molding, and during molding
Excellent chemical resistance without volatilizing glass composition components
Found that stability and stability against devitrification can be achieved
Then, the present invention was accomplished. That is, the present invention is
Ratio (wt%), SiO2 0-5 wt% B2O3 20-30 wt% Al2O3 0-5 wt% Li2O 0.1-2.5 wt% Na2O 0-5 wt% K2O 0 to 5 wt% However, Li2O + Na2O + K2O 0.1 to 7.0 wt% MgO 0 to 5 wt% CaO 0 to 10 wt% SrO 0 to 10 wt% BaO 0 to 10 wt% ZnO 1 to 19.5 wt% ZrO2 0-8 wt% La2O3 16-42 wt% Gd2O3 0 to 25 wt% Y2O3 0-10 wt% Yb2O3 0-10 wt% Nb2OFive 0-10 wt% Ta2OFive 0-15 wt% As2O3 0 to 1 wt% Sb2O3 It has a composition of 0 to 1 wt% and a refractive index (nd) of 1.68 to 1.
80, Abbe number (νd) 44 to 53, yield point (At)
For molding, characterized in that
Provide optical glass.

【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。Ｓｉ
Ｏ2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。The above composition range has been experimentally found and the reason for limiting the composition range is as follows. Si
O 2 is a glass-forming oxide that improves the stability against devitrification, but if it exceeds 5 wt%, undissolved substances tend to be generated, and the melting temperature and the yield point rise.

【００１１】Ｂ2Ｏ3はＳｉＯ2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。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
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。Ａｌ2Ｏ3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。B 2 O 3 is a glass-forming oxide like SiO 2 and is an essential component in the present invention. 20 wt%
If it is less than 3, sufficient stability against devitrification cannot be obtained, but 3
If it exceeds 0 wt%, the refractive index is lowered and the chemical durability is lowered. Al 2 O 3 improves stability against devitrification and chemical durability, but if it exceeds 5 wt%, the yield point rises.

【００１２】Ｌｉ2Ｏ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．
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。さらに、Ｌｉ2Ｏ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。Li 2 O is an essential component that lowers the melting temperature and the yield point without significantly lowering the refractive index and lowering the chemical durability as compared with other alkali metal oxides. If it is less than%, a sufficient effect cannot be obtained, and 2.
If it exceeds 5 wt%, the chemical durability and the stability against devitrification decrease. Furthermore, Li 2 O volatilizes during molding and easily adheres to the mold, making it difficult to mold with high precision.

【００１３】Ｎａ2Ｏ、Ｋ2Ｏ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。さらに、
Ｎａ 2Ｏ、Ｋ2Ｏ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。但し、Ｌｉ2
Ｏ、Ｎａ2Ｏ、Ｋ2Ｏ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。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。Na2O, K2O has a low melting temperature and yield point
However, if it exceeds 5 wt%, the refractive index will decrease and
Durability and stability against devitrification are also reduced. further,
Na 2O, K2O volatilizes during molding and easily adheres to the mold
Therefore, it becomes difficult to mold with high precision. However, Li2
O, Na2O, K2The total amount of O exceeds 7.0 wt%.
If so, the refractive index will decrease, and chemical resistance and devitrification will be reduced.
Stability is also reduced. Furthermore, these alkali metal oxides
When a product is molded, it volatilizes easily and adheres to the mold.
Molding becomes difficult.

【００１４】ＭｇＯは溶融温度を低下させるが、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。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。Although MgO lowers the melting temperature, it is 5 wt.
When it exceeds%, the stability against devitrification decreases and the tendency of phase separation increases. CaO, SrO, and BaO are useful for adjusting the refractive index and improving the stability against devitrification, but if they exceed 10 wt%, the devitrification tendency increases, and the chemical durability decreases.

【００１５】ＺｎＯは溶融温度及び屈伏点を低下させ、
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。ＺｒＯ2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。ZnO lowers the melting temperature and the yield point,
It is an essential component that is also effective for adjusting the refractive index, but if it is less than 1 wt% it will not be sufficient, and if it exceeds 19.5 wt% the dispersion will be large and the stability against devitrification will decrease, resulting in chemical durability. Sex is also reduced. ZrO 2 improves the stability against devitrification and the chemical durability, but if it exceeds 8 wt%, the devitrification tendency increases and the yield point also rises.

【００１６】Ｌａ2Ｏ3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。Ｇｄ2Ｏ3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。La 2 O 3 is an essential component for increasing the refractive index and improving the chemical durability without relatively lowering the stability against devitrification, but if it is less than 16 wt%, a sufficient effect can be obtained. If it exceeds 42 wt%, the stability against devitrification decreases and the yield point rises. Gd 2 O 3 raises the refractive index and improves the chemical durability without relatively lowering the stability against devitrification, but when it exceeds 25 wt%, the stability against devitrification decreases and the yield point Also rises.

【００１７】Ｙ2Ｏ3、Ｙｂ2Ｏ3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。Ｎｂ2Ｏ5、
Ｔａ2Ｏ5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。Y 2 O 3 and Yb 2 O 3 increase the refractive index and improve the chemical durability, but if they exceed 10 wt%, the stability against devitrification decreases and the yield point rises. Nb 2 O 5 ,
Ta 2 O 5 raises the refractive index and improves the chemical durability, but if it exceeds 10 wt% and 15 wt%, respectively, the dispersion becomes large and the stability against devitrification also decreases.

【００１８】Ａｓ2Ｏ3、Ｓｂ2Ｏ3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。また、Ｓｂ2Ｏ3は１ｗｔ％を越えるとガラスに着色
が認められる。Although As 2 O 3 and Sb 2 O 3 are used as defoaming agents, a sufficient effect can be obtained at 1 wt% or less. Further, if Sb 2 O 3 exceeds 1 wt%, coloring of the glass is recognized.

【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。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。EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Example compositions (numerical values are wt%) according to the present invention are shown in Tables 1 and 2 together with optical constants (nd, νd) and yield points (At, numerical values are ° C).

【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 is prepared by using corresponding oxides, carbonates, nitrates, etc. as raw materials for the respective components, weighing them at a desired ratio, and thoroughly mixing with powder to prepare a compounding raw material. It can be produced by, for example, charging it into a platinum crucible in an electric furnace heated to 1100 to 1300 ° C., melting and refining, homogenizing with stirring, casting in a preheated iron mold, and 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
ｄ）が１．６８〜１．８０、アッベ数（νｄ）が４４〜
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。As described above, according to the present invention, the refractive index (n
d) is 1.68 to 1.80, Abbe number (νd) is 44 to
53, the yield point (At) is 630 ° C. or less, and an optical glass having excellent chemical durability, stability against devitrification, and no 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。In addition, since the optical glass according to the present invention has a low yield point, the surface of a highly accurate mold is pressure-transferred onto a glass material so as to have a predetermined performance without requiring a final grinding / polishing step. It is extremely useful for molding to obtain a lens having

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】重量比（以下ｗｔ％）で、 ＳｉＯ2 ０ 〜 ５ ｗｔ％ Ｂ2Ｏ3 ２０ 〜 ３０ ｗｔ％ Ａｌ2Ｏ3 ０ 〜 ５ ｗｔ％ Ｌｉ2Ｏ ０．１〜 ２．５ｗｔ％ Ｎａ2Ｏ ０ 〜 ５ ｗｔ％ Ｋ2Ｏ ０ 〜 ５ ｗｔ％ 但し、Ｌｉ2Ｏ＋Ｎａ2Ｏ＋Ｋ2Ｏ ０．１〜 ７．０ｗｔ％ ＭｇＯ ０ 〜 ５ ｗｔ％ ＣａＯ ０ 〜 １０ ｗｔ％ ＳｒＯ ０ 〜 １０ ｗｔ％ ＢａＯ ０ 〜 １０ ｗｔ％ ＺｎＯ １ 〜 １９．５ｗｔ％ ＺｒＯ2 ０ 〜 ８ ｗｔ％ Ｌａ2Ｏ3 １６ 〜 ４２ ｗｔ％ Ｇｄ2Ｏ3 ０ 〜 ２５ ｗｔ％ Ｙ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｙｂ2Ｏ3 ０ 〜 １０ ｗｔ％ Ｎｂ2Ｏ5 ０ 〜 １０ ｗｔ％ Ｔａ2Ｏ5 ０ 〜 １５ ｗｔ％ Ａｓ2Ｏ3 ０ 〜 １ ｗｔ％ Ｓｂ2Ｏ3 ０ 〜 １ ｗｔ％ の組成を有し、屈折率（ｎｄ）が１．６８〜１．８０、
アッベ数（νｄ）が４４〜５３、屈伏点（Ａｔ）が６３
０℃以下であることを特徴とする光学ガラス。1. A weight ratio (hereinafter referred to as wt%) of SiO 2 0 to 5 wt% B 2 O 3 20 to 30 wt% Al 2 O 3 0 to 5 wt% Li 2 O 0.1 to 2.5 wt% Na 2 O 0 to 5 wt% K 2 O 0 to 5 wt% However, Li 2 O + Na 2 O + K 2 O 0.1 to 7.0 wt% MgO 0 to 5 wt% CaO 0 to 10 wt% SrO 0 to 10 wt % BaO 0 to 10 wt% ZnO 1 to 19.5 wt% ZrO 2 0 to 8 wt% La 2 O 3 16 to 42 wt% Gd 2 O 3 0 to 25 wt% Y 2 O 3 0 to 10 wt% Yb 2 O 3 0 to 10 wt% Nb 2 O 5 0 to 10 wt% Ta 2 O 5 0 to 15 wt% As 2 O 3 0 to 1 wt% Sb 2 O 3 0 to 1 wt% and refraction The rate (nd) is 1.68 to 1.80,
Abbe number (νd) is 44 to 53, yield point (At) is 63
An optical glass having a temperature of 0 ° C. or lower.
JP15630194A 1994-07-07 1994-07-07 Optical glass Expired - Lifetime JP3458462B2 (en)

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