JP3015078B2 - Optical glass for precision press - Google Patents
Optical glass for precision pressInfo
- Publication number
- JP3015078B2 JP3015078B2 JP2205386A JP20538690A JP3015078B2 JP 3015078 B2 JP3015078 B2 JP 3015078B2 JP 2205386 A JP2205386 A JP 2205386A JP 20538690 A JP20538690 A JP 20538690A JP 3015078 B2 JP3015078 B2 JP 3015078B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- optical
- optical glass
- precision press
- less
- 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.)
- Expired - Lifetime
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
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)
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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical glass for precision press which can be press-formed at a very low temperature.
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60−122749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58−217
451号公報、参照）ホウ珪酸塩系ガラス（特開昭62−123
040号公報、参照）が知られている。2. Description of the Related Art Conventionally, there is an SSK type (nd = 1.60-1.67, vd = 50-55) optical glass having the same optical constant. Further, as a glass for precision press molding, phosphate glass (Japanese Patent Application Laid-Open Nos. Sho 60-122749 and 58-79839)
JP-A No. 19342/1992; fluorophosphate-based glass (JP-A-56-59641, JP-A-58-217)
No. 451, see) Borosilicate glass (JP-A-62-123)
No. 040, 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（At）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。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。Problems to be Solved by the Invention However, the conventional SSK type (nd = 1.60-1.67,
Optical glass with νd = 50-55) has a yield temperature (At) of 600
C. or higher, the pressing temperature can be as high as 650 C. or higher. However, the mold materials for precision press molding known so far have a molding temperature of 600
When the temperature exceeds ℃, the material is deteriorated, and it is difficult to maintain the surface accuracy of the mold, which is not suitable for mass production of press lenses. Therefore, it is desired that the glass to be pressed can be formed at a temperature as low as possible, and glasses as disclosed in the respective publications relating to the glass for press forming have been proposed. However, the glass of these systems has low refractive index and low dispersion or low refractive index and high dispersion. In the above-mentioned publication, glass containing lead as a glass component is described. However, when lead is contained, volatile matter of lead adheres to a mold material, causing a problem in maintaining surface accuracy and the like. Further, some of them are insufficient in terms of 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、Ａ（1.682、52.8）、Ｂ（1.6
22、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（ν
ｄ）を有する光学ガラスを提供することにある。Accordingly, a first object of the present invention is to provide an optical glass for precision press capable of performing precision press at a low temperature (600 ° C. or lower). Further, the second object of the present invention is that points A (1.682, 52.8) and B (1.6
22, 55.1), C (1.655, 46.0) and D (1.701, 45.3) in the range surrounded by four points (nd) and Abbe number (ν)
An object of the present invention is to provide an optical glass having d).
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、SiO2、B2O3、La2O3、Gd2O3、Nb2O5、CaO、
BaO、ZnO、Al2O3、Li2O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適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 SiO2 10.0〜36.0重量％（以下％で示す） B2O3 10.0〜30.0％ 但し、SiO2＋B2O3の合量 30.0〜51.0％ La2O3 2.0〜25.0％ Gd2O3 3.0〜13.0％ 但し、La2O3＋Gd2O3の合量 7.0〜30.0％ ZrO2 0 〜 4.0％ Nb2O5 0.3〜 8.0％ TiO2 0 〜 1.0％ CaO 2.0〜15.0％ BaO 1.0〜18.0％ ZnO 5.0〜30.0％ Al2O3 0.5〜 5.0％ Li2O 2.0〜 6.0％ Na2O 0 〜 4.0％ からなる組成を有している。Means for Solving the Problems The present inventors have conducted various studies in view of the various drawbacks of the conventional optical glass and the press-forming optical glass as described above, and have found that SiO 2 , B 2 O 3 , La 2 O 3 , Gd 2 O 3 , Nb 2 O 5 , CaO,
An optical glass having a glass composition essential for BaO, ZnO, Al 2 O 3 , and Li 2 O is provided within a predetermined range, and has optical properties not present in the above-mentioned publications for optical glass for press molding. Sometimes found to have a sufficiently low glass softening temperature that has little effect on the mold material,
It has been concluded that it is optimal as an optical glass for precision press that does not require grinding or polishing after press molding. That is, when the present invention is expressed in terms of% by weight, SiO 2 10.0 to 36.0% by weight (hereinafter referred to as%) B 2 O 3 10.0 to 30.0% However, the total amount of SiO 2 + B 2 O 3 is 30.0 to 51.0% La 2 O 3 2.0 to 25.0% Gd 2 O 3 3.0 to 13.0% However, total amount of La 2 O 3 + Gd 2 O 3 7.0 to 30.0% ZrO 20 to 4.0% Nb 2 O 5 0.3 to 8.0% TiO 20 to 1.0% CaO 2.0~15.0% BaO 1.0~18.0% ZnO 5.0~30.0% Al 2 O 3 has a composition consisting of 0.5~ 5.0% Li 2 O 2.0~ 6.0 % Na 2 O 0 ~ 4.0%.
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 reasons for limiting the component ranges of the optical glass according to the present invention as described above are as follows.
SiO2は、ガラスの網目を構成する主成分であるが、3
6.0％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。SiO 2 is the main component of the glass network,
If it exceeds 6.0%, the viscosity at the time of melting increases, which causes an increase in the softening temperature. On the other hand, if it is less than 10.0%, the tendency of devitrification increases and the chemical durability deteriorates.
B2O3は、SiO2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。B 2 O 3 constitutes a glass network like SiO 2 and is a component effective for stabilizing the glass. However, if it is less than 10.0%, the glass becomes unstable, and if it exceeds 30.0%, the chemical durability becomes poor.
また、SiO2＋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％より多くなると所定の光学恒数
が得られなくなるのでその範囲内とする。If the total amount of SiO 2 + B 2 O 3 is less than 30.0%, the glass becomes unstable, and if it exceeds 51.0%, a predetermined optical constant cannot be obtained.
La2O3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 La 2 O 3 is less than 2.0%, the intended optical performance cannot be obtained, and if the amount is more than 25.0%, the glass becomes unstable.
Gd2O3は、La2O3と同様の光学特性をガラスに与え、し
かもガラスの矢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矢透傾向を増し
て不安定となる。Gd 2 O 3 gives the glass the same optical properties as La 2 O 3 and has the effect of reducing the tendency of the glass to show arrowheads. However, if the amount is out of the range of 3.0 to 13.0%, the glass tends to show arrowheads. And become unstable.
また、La2O3＋Gd2O3の合量が7.0％より少ないと目的
の光学工数が得られず、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。If the total amount of La 2 O 3 + Gd 2 O 3 is less than 7.0%, the desired optical man-hour cannot be obtained, and if it exceeds 30.0%, not only the stability of the glass is impaired, but also the softening temperature increases. .
ZrO2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。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
は矢透傾向を増大する。ZrO 2 is very effective in improving the chemical durability of glass, and is also effective in increasing the refractive index. But 4.0
%, The softening temperature increases, the dispersion becomes higher, and the tendency of arrow penetration increases.
Nb2O5、TiO2は光学恒数の調整用成分である。Nb 2 O 5 and TiO 2 are components for adjusting optical constants.
Nb2O5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矢透傾向が増大す
る。When Nb 2 O 5 is less than 0.3%, a predetermined optical constant cannot be obtained, and when Nb 2 O 5 is more than 8.0%, the tendency of glass to pass through increases.
TiO2は、1.0％より多くなると矢透傾向が増大する。When TiO 2 is more than 1.0%, the tendency of arrow penetration increases.
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。CaO is an effective component for improving the chemical durability and adjusting the optical constants. However, if it is less than 2.0%, the above effect is small, and if it is more than 15.0%, the tendency to devitrify 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 for stabilizing glass and reducing dispersion.
If it is less than 1.0%, the above effect is small, and if it is more than 18.0%, the chemical durability deteriorates.
ZnOは、他の成分に比べ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く、3
0.0％より多くなると化学的耐久性の低下及び矢透傾向
を増してしまうので所定の範囲内とする。ZnO is more effective in lowering the softening temperature of glass than other components. It is also a very effective component for adjusting optical constants. However, less than 5.0%, the effect is small, 3
If it exceeds 0.0%, the chemical durability decreases and the tendency of arrow penetration increases.
Al2O3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。Al 2 O 3 , like ZrO 2 , is very effective in improving the chemical durability of glass. However, if less than 0.5%, the effect is small, and if it is more than 5.0%, the softening temperature of the glass is increased. Inside.
Li2O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
性を悪くする。Li 2 O has an effect of significantly lowering the softening temperature by adding an appropriate amount of a small amount as an essential component without lowering the chemical durability than other alkali components. However, if it is less than 2.0%, the effect is small, and if it is more than 6.0%, the stability of the glass is impaired and the chemical durability is deteriorated.
Na2Oは、Li2O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。Na 2 O, like Li 2 O, has the effect of lowering the softening temperature. However, if it exceeds 4.0%, the chemical durability of the glass is deteriorated.
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、Ｙ、Yb、などの金属
酸化物を含有させることができる。In the optical glass of the present invention, in addition to the above components, for adjusting the optical performance, improving the meltability, expanding the vitrification range, lowering the softening temperature, and the like, unless deviated from the object of the present invention, Metal oxides such as K, Cs, Sr, Mg, Ga, In, Y, and Yb 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）、アッベ数（νｄ）、屈伏温度（At）を第１
表に示す。Example Next, the composition (numerical value is% by weight), the refractive index (nd), the Abbe number (νd), and the yield temperature (At) of the example according to the present invention were set to the first values.
It is shown in the table.
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、精澄、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As2O
3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。 The optical glass of the present invention uses a corresponding oxide, hydroxide, carbonate, nitrate, or the like as a raw material for each component, weighs it at a predetermined ratio, mixes well, and as a glass blending raw material, a platinum crucible And melted in an electric furnace at 1000 ° C to 1300 ° C, stirred with a platinum stirrer, refined, homogenized, cast into a mold preheated to an appropriate temperature, and then slowly cooled Make A small amount of As 2 O is used to prevent coloring of the glass and to remove bubbles.
Adding 3 or adding a small amount of a defoaming component well known in the industry does not affect the effect of the present invention.
発明の効果 本発明によれば、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
有し、矢透に対して安定であり、きわめて低い温度でプ
レス成形が可能なため、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。According to the present invention, the yield temperature (At) is 550 ° C. or less and the points A (1.682, 52.8) and B (1.622, 55.
1) having a refractive index (nd) and an Abbe number (νd) within a range surrounded by four points of C (1.655, 46.0) and D (1.701, 45.3); Since press molding can be performed at an extremely low temperature, it is useful as an optical glass for precision press 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-νd diagram) showing an optical constant region of the glass of the present invention.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−123040（ＪＰ，Ａ) 特開 平１−286934（ＪＰ，Ａ) 特開 昭57−51149（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03C 3/00 - 4/20 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-123040 (JP, A) JP-A-1-286934 (JP, A) JP-A-57-51149 (JP, A) (58) Field (Int. Cl. 7 , DB name) C03C 3/00-4/20
Claims (1)
示す） B2O3 10.0〜30.0％ 但し、SiO2＋B2O3の合量 30.0〜51.0％ La2O3 2.0〜25.0％ Gd2O3 3.0〜13.0％ 但し、La2O3＋Gd2O3の合量 7.0〜30.0％ ZrO2 0 〜 4.0％ Nb2O5 0.3〜 8.0％ TiO2 0 〜 1.0％ CaO 2.0〜15.0％ BaO 1.0〜18.0％ ZnO 5.0〜30.0％ Al2O3 0.5〜 5.0％ Li2O 2.0〜 6.0％ Na2O 0 〜 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。(1) SiO 2 10.0 to 36.0% by weight (hereinafter referred to as%) B 2 O 3 10.0 to 30.0% However, total amount of SiO 2 + B 2 O 3 30.0 to 51.0% La 2 O 3 2.0 to 25.0% Gd 2 O 3 3.0 to 13.0% Total amount of La 2 O 3 + Gd 2 O 3 7.0 to 30.0% ZrO 20 to 4.0% Nb 2 O 5 0.3 to 8.0% TiO 20 to 1.0% CaO 2.0 to 15.0% BaO 1.0 to 18.0% ZnO 5.0 to 30.0% Al 2 O 3 0.5 to 5.0% Li 2 O 2.0 to 6.0% Na 2 O 0 to 4.0%, with a yield temperature (At) of 550 ° C. or less and the first Points shown in the figure, A (1.682, 52.8), B (1.622, 55.
1) Optical glass for precision press having a refractive index (nd) and an Abbe number (νd) within a range surrounded by four points of C (1.655, 46.0) and D (1.701, 45.3).
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 JPH0492834A (en) | 1992-03-25 |
| JP3015078B2 true 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006111482A (en) * | 2004-10-14 | 2006-04-27 | Konica Minolta Opto Inc | Optical glass and optical element |
| JP4703168B2 (en) * | 2004-11-09 | 2011-06-15 | 株式会社オハラ | Optical glass |
| JP2007008761A (en) * | 2005-06-30 | 2007-01-18 | Konica Minolta Opto Inc | Optical glass and optical element |
| JP4410733B2 (en) * | 2005-07-29 | 2010-02-03 | Ｈｏｙａ株式会社 | Optical glass, precision press-molding preform and manufacturing method thereof, optical element and manufacturing method thereof |
| JP2007145615A (en) * | 2005-11-25 | 2007-06-14 | Konica Minolta Opto Inc | Optical glass and optical element |
| CN101389576A (en) * | 2006-02-24 | 2009-03-18 | 旭硝子株式会社 | Optical glass and lens |
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-
1990
- 1990-08-02 JP JP2205386A patent/JP3015078B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0492834A (en) | 1992-03-25 |
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