JPH0492834A - Optical glass for precise press - Google Patents
Optical glass for precise pressInfo
- Publication number
- JPH0492834A JPH0492834A JP20538690A JP20538690A JPH0492834A JP H0492834 A JPH0492834 A JP H0492834A JP 20538690 A JP20538690 A JP 20538690A JP 20538690 A JP20538690 A JP 20538690A JP H0492834 A JPH0492834 A JP H0492834A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- optical glass
- optical
- sio2
- gd2o3
- 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
Links
- 239000005304 optical glass Substances 0.000 title abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 9
- 229910011255 B2O3 Inorganic materials 0.000 abstract description 5
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 abstract description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052681 coesite Inorganic materials 0.000 abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 2
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 abstract 4
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 abstract 3
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 abstract 3
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 abstract 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 abstract 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 30
- 230000003287 optical effect Effects 0.000 description 13
- 239000000126 substance Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000000465 moulding Methods 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000004031 devitrification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005303 fluorophosphate glass Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000005365 phosphate glass Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はきわめて低温でプレス成形可能な、精密プレス
用光学ガラスに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical glass for precision press that can be press-formed at extremely low temperatures.
従来の技術
従来同じような光学恒数を持つものとして、ＳＳＫタイ
プ（ｎｄ ＝ １．６０〜１．６７、νｄ＝５０〜５５
）の光学ガラスが存在する。また精密プレス成形用のガ
ラスとして、燐酸塩系ガラス（特開昭６０−１２２７４
９号公報、特開昭５８−７９８３９号公報、欧州特許第
１９３４２号明細書、参照）フルオロ燐酸塩系ガラス（
特開昭５６−５９６４１号公報、特開昭５８−２１７４
５１号公報、参照）ホウ珪酸塩系ガラス（特開昭６２−
１２３０４０号公報、参照）が知られている。Conventional technology The SSK type (nd = 1.60 to 1.67, νd = 50 to 55
) optical glasses exist. In addition, phosphate glass (Japanese Patent Application Laid-Open No. 60-12274
9, JP-A-58-79839, European Patent No. 19342) Fluorophosphate glass (
JP-A-56-59641, JP-A-58-2174
No. 51, see) Borosilicate glass (Japanese Unexamined Patent Publication No. 1983-
123040, reference) is known.
発明が解決しようとする課題
しかし、従来よりあるＳＳＫタイプ（ｎｄ ＝１．６０
〜１．６７、νｄ＝５０〜５５）の光学ガラスは、屈伏
温度（＾ｔ）が６００℃もしくは、それ以上で、そのプ
レス温度は６５０℃もしくはそれ以上の高い温度となる
。しかし、これまでに知られている精密プレス成形用の
型材料は成形温度が６００℃以上になると材料の劣化が
起こり、型の面精度を保持することが困難になりプレス
レンズの量産には適さない。Problems to be Solved by the Invention However, the conventional SSK type (nd = 1.60
-1.67, νd=50-55), the yielding temperature (^t) is 600°C or higher, and the pressing temperature is as high as 650°C or higher. However, the mold materials known to date for precision press molding deteriorate when the molding temperature exceeds 600°C, making it difficult to maintain the surface accuracy of the mold, making them unsuitable for mass production of press lenses. do not have.
そのためプレスされるガラスは可能な限り低い温度で成
形できるものが望まれ、上記プレス成形用ガラスに関す
る各公開公報中に見られるようなガラスが提案されてい
る。しかし、これらの系のガラスは、その光学特性が低
屈折低分散、あるいは低屈折高分散である。また上記公
報中にはガラス成分として鉛を含んでいるガラスが述べ
られているが、鉛を含むと鉛の揮発物が型材に付着し面
精度の保持等に問題が生じる。さらに化学的耐久性の点
で不十分なものもある。Therefore, it is desired that the glass to be pressed be able to be formed at the lowest possible temperature, and glasses such as those found in the above-mentioned publications regarding press-molding glasses have been proposed. However, these types of glasses have optical properties of low refraction, low dispersion, or low refraction and high dispersion. Further, the above-mentioned publication describes a glass containing lead as a glass component, but if lead is included, lead volatiles will adhere to the mold material, causing problems in maintaining surface accuracy, etc. Furthermore, some have insufficient chemical durability.
従って本発明の第一の目的は、低い温度（６００℃以下
）で精密プレスを実施することができる精密プレス用光
学ガラスを提供することにある。また本発明の第二の目
的は、第１図に示す点、＾［１，６８２，５２，８１、
Ｂ （１，６２２，５５，＋１、Ｃ（１，６５５，４６
，０）、Ｄ ［１，７０１，４５，３１の４点で囲まれ
た範囲内の屈折率（ｎｄｌ及びアツベ数 （νｄ）を有
する光学ガラスを提供することにある。Therefore, the first object of the present invention is to provide an optical glass for precision pressing that can be precision pressed at low temperatures (600° C. or lower). A second object of the present invention is to solve the problems shown in FIG.
B (1,622,55,+1, C(1,655,46
, 0), D[1,701, 45, and 31.
課題を解決するための手段
本発明者等は、以上のような従来の光学ガラス及びプレ
ス成形用光学ガラスの諸欠点をかんがみて種々考察研究
した結果、５ｌＯｔ、Ｂ２０１、Ｌａｗ’ｓ、ＧｄｔＯ
ｓ、 Ｎｂ１Ｏａ、 Ｃａｂ、 ＢａＯ１ＺｎＯ
１Ａｌ□ｏｓ、ＬｉｔＯを必須とするガラス組成の光学
ガラスが所定の範囲内において、上記の公開公報中のプ
レス成形用光学ガラスにない光学特性を備え、さらにプ
レスレンズ成形時に型材料に対してほとんど影響を及ぼ
さない十分に低いガラス軟化温度を持つことを見出し、
プレス成形後研削または研磨を必要としない精密プレス
用光学ガラスとして最速であるという結論に達したもの
である。すなわち、本発明を重量％で示すと
５ｉＯｚ １０．０〜３６．０重量 ％（以下
％で示す）
Ｂ、０． １ｆ１．０〜３０．０ ％但し、５
ｉＯｚ ＋ Ｂ２Ｏ３の合量
３０．０〜５１．０ ％
Ｌａ、０． ２．０ 〜２５．０
％Ｇｄ、０． ３．０ 〜１３．
０ ％但し、Ｌａ２’ｓ ＋ ＧｄｘＯｓの含量７
．０〜３０．０ ％
Ｚｒ０． ０ 〜 ４．０
％Ｎｂ、０． ０．３ 〜 ８．０
％Ｔｉｅ、 Ｏ〜 １
．０ ％Ｃａ０ ２．０
〜 ｌｓ、ｏ ％ＢａＯ１，０〜 １８．０
％
ＺｎＯ５，０〜 ３０．０ ％
＾１２０． ０．５−〜 ５．０
％Ｌｊ、０ ２．０ 〜 ６．０
％Ｎａ２Ｏ０〜 ４．０ ％
からなる組成を有している。Means for Solving the Problems The inventors of the present invention have conducted various studies considering the drawbacks of conventional optical glasses and optical glasses for press molding as described above.
s, Nb1Oa, Cab, BaO1ZnO
Within a certain range, optical glass with a glass composition that requires 1Al□os and LitO has optical properties not found in the optical glass for press molding in the above-mentioned publication, and also has almost no resistance to the mold material during press lens molding. It was discovered that the glass softening temperature was low enough to have no effect on the glass.
We have reached the conclusion that this is the fastest optical glass for precision presses that does not require grinding or polishing after press molding. That is, when the present invention is expressed in weight %, 5iOz 10.0 to 36.0 weight % (hereinafter expressed in %) B, 0. 1f1.0~30.0%However, 5
Total amount of iOz + B2O3 30.0-51.0% La, 0. 2.0 ~25.0
%Gd, 0. 3.0 to 13.
0% However, the content of La2's + GdxOs is 7
．． 0-30.0% Zr0. 0 to 4.0
%Nb, 0. 0.3 ~ 8.0
%Tie, O~1
．． 0%Ca0 2.0
~ls,o%BaO1,0~18.0
% ZnO5.0~30.0% ^120. 0.5-~5.0
%Lj, 0 2.0 ~ 6.0
It has a composition of 0 to 4.0% Na2O.
本発明に係る光学ガラスの各成分範囲を上記のように限
定した理由は次のとおりである。The reason why the range of each component of the optical glass according to the present invention is limited as described above is as follows.
５１０２は、ガラスの網目を構成する主成分であるが、
３６．０％を超えると溶融時の粘性が大きくなり軟化温
度の上昇を招く。また、１０．０％より少ないと失透傾
向が増大し、化学的耐久性が悪くなる。5102 is the main component constituting the glass network,
If it exceeds 36.0%, the viscosity during melting increases, leading to an increase in the softening temperature. On the other hand, if it is less than 10.0%, the tendency to devitrify increases, resulting in poor chemical durability.
Ｂ２０．は、ＳｉＯｘと同様ガラスの網目を構成し、ガ
ラスの安定化に有効な成分である。しかし、１０．０％
より少ないとガラスが不安定になり、３０．０％より多
くなると化学的耐久性が悪くなる。B20. Like SiOx, it forms the network of glass and is an effective component for stabilizing glass. However, 10.0%
If it is less than 30.0%, the glass becomes unstable, and if it is more than 30.0%, the chemical durability deteriorates.
また、ＳｉＯオ＋Ｂ２Ｏ３の合量が３０，０％より少な
いとガラスは不安定となり、５１．０％より多（なると
所定の光学恒数が得られな（なるのでその範囲内とする
。Further, if the total amount of SiO2+B2O3 is less than 30.0%, the glass becomes unstable, and if it is more than 51.0%, predetermined optical constants cannot be obtained, so it is set within this range.
Ｌａｗ’ｓは、その量が２．０％より少ないと目的とす
る光学性能が得られず、２５．０％より多くなるとガラ
スを不安定にするので、所定の範囲内とする。If the amount of Law's is less than 2.0%, the desired optical performance cannot be obtained, and if it is more than 25.0%, the glass becomes unstable, so it is set within a predetermined range.
ＧｄＪｓは、Ｌａｗ’ｓと同様の光学特性をガラスに与
え、しかもガラスの失透傾向を減少させる効果があるが
、その量が３．０〜１３．０％の範囲外ではガラスは失
透傾向を増して不安定となる。GdJs gives glass the same optical properties as Law's and has the effect of reducing the tendency of glass to devitrify, but when the amount is outside the range of 3.0 to 13.0%, glass tends to devitrify. increases and becomes unstable.
また、Ｌａ２Ｏ５” ＧｄｚＯｓの合量が７．０％より
少ないと目的の光学恒数が得られず、３０．０％より多
いとガラスの安定性を損なうばかりでなく、軟化温度を
上昇させてしまう。Furthermore, if the total amount of La2O5"GdzOs is less than 7.0%, the desired optical constants cannot be obtained, and if it is more than 30.0%, it not only impairs the stability of the glass but also increases the softening temperature. .
ＺｒＯ□は、ガラスの化学的耐久性の向上に非常に有効
でありさらに、高屈折率化にも効果がある。ZrO□ is very effective in improving the chemical durability of glass and is also effective in increasing the refractive index.
しかし、４．０％より多くなると軟化温度の上昇及び高
分散化、さらには失透傾向を増大する。However, if it exceeds 4.0%, the softening temperature increases, the dispersion becomes high, and the tendency to devitrify increases.
ＮｂｚＯｓ、 ＴｉＯ□は光学恒数の調整用成分である
。NbzOs and TiO□ are components for adjusting optical constants.
Ｎｂ、Ｏ，は、０．３％より少ないと所定の光学恒数が
得られず、８．０％より多くなるとガラスの失透傾向が
増大する。If Nb, O, is less than 0.3%, predetermined optical constants cannot be obtained, and if it is more than 8.0%, the tendency of the glass to devitrify increases.
ＴｉＯ□は、１．０％より多くなると失透傾向が増大す
る０
ＣａＯは、化学的耐久性の向上、光学恒数の調整に有効
な成分であるが、２．０％より少ないと上記効果が少な
く、１５．０％より多いと失透傾向が増大する。When TiO□ exceeds 1.0%, the tendency to devitrify increases.0 CaO is an effective component for improving chemical durability and adjusting optical constants, but when it is less than 2.0%, the above effects occur. If the amount is less than 15.0%, the tendency for devitrification increases.
ＢａＯは、ガラスの安定化、低分散化に効果があるが、
１．０％より少ないと上記効果が少なく、１８．０％よ
り多くなると化学的耐久性を悪くする。BaO is effective in stabilizing glass and reducing dispersion, but
If it is less than 1.0%, the above effects will be small, and if it is more than 18.0%, chemical durability will be deteriorated.
ＺｎＯは、他の成分に比ベガラスの軟化温度の低下に有
効である。また光学恒数の調整にも非常に有効な成分で
ある。しかし、５．０％より少ないとその効果が少な（
、３０，０％より多くなると化学的耐久性の低下及び失
透傾向を増してしまうので所定の範囲内とする。ZnO is more effective than other components in lowering the softening temperature of glass. It is also a very effective component for adjusting optical constants. However, if it is less than 5.0%, the effect is small (
If it exceeds 30.0%, the chemical durability will decrease and the tendency for devitrification will increase, so it should be within a predetermined range.
Ａｌ２Ｏ５は、ＺｒＯ２と同様ガラスの化学的耐久性の
向上に非常に有効であるが、０．５％より少ないとその
効果が少なく、５．０％より多くなるとガラスの軟化温
度を上昇させるので所定内とする。Al2O5, like ZrO2, is very effective in improving the chemical durability of glass, but if it is less than 0.5%, the effect is small, and if it is more than 5.0%, it increases the softening temperature of the glass, so Within.
ＬｉＪは、少量の必須成分として適量加えることにより
、他のアルカリ成分よりも化学的耐久性の低下をもたら
すことなく、著しく軟化温度を下げる効果を持つ。しか
し、２．０％より少ないとその効果は少なく、６．０％
より多くなるとガラスの安定性を損なうと共に、化学的
耐久性を悪（する。When added in an appropriate amount as a small amount of essential component, LiJ has the effect of significantly lowering the softening temperature without lowering the chemical durability compared to other alkaline components. However, if it is less than 2.0%, the effect is small, and 6.0%
If the amount is too high, the stability of the glass will be impaired and the chemical durability will be adversely affected.
ＮａＪは、Ｌｉ 、０と同じく、軟化温度を下げる効果
を持つ。しかし、４．０％より多くなるとガラスの化学
的耐久性を悪くしてしまう。NaJ, like Li 2 , 0, has the effect of lowering the softening temperature. However, if it exceeds 4.0%, the chemical durability of the glass will deteriorate.
本発明の光学ガラスには、上記成分の他に、光学性能の
調整、溶融性の改善、ガラス化範囲の拡大及び軟化温度
の低温度化等のために、本発明の目的からはずれないか
ぎり、Ｋ、Ｃｓ、Ｓｒ、Ｍｇ、Ｇａ。In addition to the above-mentioned components, the optical glass of the present invention includes, as long as it does not depart from the purpose of the present invention, for the purpose of adjusting optical performance, improving meltability, expanding the vitrification range, lowering the softening temperature, etc. K, Cs, Sr, Mg, Ga.
Ｉｎ、Ｙ、Ｙｂ、などの金属酸化物を含有させることが
できる。Metal oxides such as In, Y, Yb, etc. can be contained.
実施例
次に本発明に係る実施例の組成（数値は重量％）、屈折
率（ｎｄ）、アツベ数（νｄ）、屈伏温度（＾ｔ）を第
１表に示す。Examples Next, Table 1 shows the compositions (values are weight %), refractive index (nd), Abbe's number (vd), and yield temperature (^t) of examples according to the present invention.
第１表
本発明の光学ガラスは、各成分の原料として各々相当す
る酸化物、水酸化物、炭酸塩、硝酸塩等を使用し、所定
の割合で秤量し、充分混合してガラス調合原料として、
白金製坩堝に投入して電気炉で１０００℃〜１３００℃
で溶融し、白金製撹拌棒にて撹拌して、清澄、均質化し
てから適当な温度に予熱した金型内に鋳込んだ後、徐冷
して作る。なおガラスの着色を防ぎ、脱泡のため少量の
Ａｓ５ｅｓを加えること、または工業上良く知られてい
る脱泡成分の少量添加は、本発明の効果に影響を与えな
い。Table 1 The optical glass of the present invention uses corresponding oxides, hydroxides, carbonates, nitrates, etc. as raw materials for each component, weighs them in predetermined proportions, and thoroughly mixes them to form a raw material for glass preparation.
Pour into a platinum crucible and heat at 1000℃ to 1300℃ in an electric furnace.
It is made by melting it, stirring it with a platinum stirring rod to clarify and homogenize it, then casting it into a mold preheated to an appropriate temperature, and then slowly cooling it. Note that adding a small amount of As5es to prevent glass coloring and defoaming, or adding a small amount of an industrially well-known defoaming component does not affect the effects of the present invention.
め、プレス成形後、研削または研磨を必要としない精密
プレス用光学ガラスとして有用である。Therefore, it is useful as an optical glass for precision presses that does not require grinding or polishing after press molding.
第１図は、本発明のガラスの光学恒数領域を示す光学恒
数図（ｎｄ−νｄ図）である。FIG. 1 is an optical constant diagram (nd-vd diagram) showing the optical constant region of the glass of the present invention.
Claims (1)
３０．０％ ＺｒＯ＿２０〜４．０％ Ｎｂ＿２Ｏ＿５０．３〜８．０％ ＴｉＯ＿２０〜１．０％ ＣａＯ２．０〜１５．０％ ＢａＯ１．０〜１８．０％ ＺｎＯ５．０〜３０．０％ Ａｌ＿２Ｏ＿３０．５〜５．０％ Ｌｉ＿２Ｏ２．０〜６．０％ Ｎａ＿２Ｏ０〜４．０％ の組成からなる、屈伏温度（Ａｔ）が５５０℃以下で、
かつ第１図に示す点、Ａ（１．６８２、５２．８）、Ｂ
（１．６２２、５５．１）、Ｃ（１．６５５、４６．０
）、Ｄ（１．７０１、４５．３）の４点で囲まれた範囲
内の屈折率（ｎｄ）及びアッベ数（νｄ）を有する精密
プレス用光学ガラス。[Claims] SiO_2 10.0 to 36.0% by weight (hereinafter expressed in %) B_2O_3 10.0 to 30.0% However, the total amount of SiO_2 + B_2O_3 is 30.0 to 51.0% La_2O_32.0 to 25.0 % Gd_2O_33.0~13.0% However, the total amount of La_2O_3+Gd_2O_3 is 7.0~
30.0% ZrO_20-4.0% Nb_2O_50.3-8.0% TiO_20-1.0% CaO2.0-15.0% BaO1.0-18.0% ZnO5.0-30.0% Al_2O_30. It has a composition of 5-5.0% Li_2O2.0-6.0% Na_2O0-4.0% and has a yield temperature (At) of 550°C or less,
And the points shown in Figure 1, A (1.682, 52.8), B
(1.622, 55.1), C (1.655, 46.0
), D (1.701, 45.3), and has a refractive index (nd) and Abbe number (νd) for precision press use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2205386A JP3015078B2 (en) | 1990-08-02 | 1990-08-02 | Optical glass for precision press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2205386A JP3015078B2 (en) | 1990-08-02 | 1990-08-02 | Optical glass for precision press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0492834A true JPH0492834A (en) | 1992-03-25 |
| JP3015078B2 JP3015078B2 (en) | 2000-02-28 |
Family
ID=16505963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2205386A Expired - Lifetime JP3015078B2 (en) | 1990-08-02 | 1990-08-02 | Optical glass for precision press |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3015078B2 (en) |
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