JP2714915B2 - Optical glass - Google Patents
Optical glassInfo
- Publication number
- JP2714915B2 JP2714915B2 JP4280730A JP28073092A JP2714915B2 JP 2714915 B2 JP2714915 B2 JP 2714915B2 JP 4280730 A JP4280730 A JP 4280730A JP 28073092 A JP28073092 A JP 28073092A JP 2714915 B2 JP2714915 B2 JP 2714915B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- component
- optical
- chemical durability
- amount
- 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 - Fee Related
Links
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- Glass Compositions (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＳｉＯ２−Ｂ２Ｏ３ −
ＴｉＯ ２ −Ａｌ２Ｏ３−ＺｒＯ２−ＢａＯ系の組成にお
いて、Ｌａ ２ Ｏ ３ や環境上問題になる有害なＰｂＯ、Ｚ
ｎＯ、ＡｓＯ３成分を含有せず、屈折率（Ｎｄ）が約
１．６０〜１．６５およびアッベ数（νｄ）が約５５〜
６２の範囲の光学恒数を示し、温純水洗浄等に適合する
化学的耐久性を有する新規な光学ガラス（但し、光ファ
イバー用を除く）に関する。The present invention relates to, SiO 2 -B 2 O 3 -
The composition of TiO 2 —Al 2 O 3 —ZrO 2 —BaO system
And La 2 O 3 and harmful PbO and Z which cause environmental problems
nO, it contains no AsO 3 components, a refractive index (Nd) of about 1.60 to 1.65 and Abbe number ([nu] d) of about 55
A new optical glass ( having optical constants in the range of 62
Except for Ivar) .
【０００２】[0002]
【従来の技術】従来から前記の光学恒数を有するガラス
としては、多量のＢａＯ成分を含有するＳｉＯ2−Ｂ2Ｏ
3−ＢａＯ系のガラスか知られており、光学恒数調整の
ため、ＺｎＯ、ＰｂＯおよびＴｉＯ2成分を含んでい
る。例えば「ガラス組成データブック・１９９１
（（社）日本硝子製品工業会発行）」には、ＳｉＯ2−
Ｂ2Ｏ3−Ａｌ2Ｏ3−ＴｉＯ2−ＺｎＯ−ＣａＯ−ＢａＯ
系等のガラスが記載されており、また特開昭５３−９０
３１２号には、ＳｉＯ2−Ｂ2Ｏ3−Ａｌ2Ｏ3−ＺｒＯ2−
ＺｎＯ−ＣａＯ−ＢａＯ系ガラスが開示されている。し
かし前記ガラスは、有害性のＰｂＯ、ＺｎＯおよびＡｓ
2Ｏ3成分を含んでおり、ガラス加工時に排出するガラス
屑やスラッジ等により環境を汚染するという問題があ
り、また近年の脱フロン化の動きの中で、ガラスの洗浄
方法として、温純水洗浄方式が提案されているが、それ
は今まで以上にガラスの化学的耐久性を必要とする洗浄
方法であり、前記のガラスでは化学的耐久性が不十分で
ある。 2. Description of the Related Art Conventionally, as glass having the above-mentioned optical constant, SiO 2 —B 2 O containing a large amount of BaO component has been used.
3 are known or -BaO based glass, for optical constants adjusted, ZnO, contain PbO and TiO 2 component. For example, "Glass Composition Data Book 1991
((S) and Japan glass products Industry Association issued) to "is, SiO 2 -
B 2 O 3 -Al 2 O 3 -TiO 2 -ZnO-CaO-BaO
And other glasses are described.
No. 312 includes SiO 2 —B 2 O 3 —Al 2 O 3 —ZrO 2 —
A ZnO-CaO-BaO-based glass is disclosed. However, the glasses are harmful PbO, ZnO and As.
Since it contains 2 O 3 components, there is a problem of polluting the environment with glass chips and sludge discharged during glass processing. However, this is a cleaning method that requires the chemical durability of glass more than ever, and the glass described above has insufficient chemical durability.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、前記従来の
ガラスに見られる諸欠点を総合的に解決し、Ｌａ ２ Ｏ ３
や環境上問題になる有害なＰｂＯ、ＺｎＯおよびＡｓ２
Ｏ３成分を含有せず、屈折率（Ｎｄ）が約１．６０〜
１．６５、アッベ数（νｄ）が約５５〜６２の範囲の光
学恒数を有し、温純水洗浄等に適合する化学的耐久性の
優れた光学ガラス（但し、光ファイバー用を除く）を提
供することを目的としている。SUMMARY OF THE INVENTION The present invention comprehensively solves the above-mentioned drawbacks of the conventional glass, and is characterized by La 2 O 3
Harmful PbO become and environmental problems, ZnO and As 2
O 3 contained no component, the refractive index (Nd) of about 1.60～
1.65, providing optical glass (except for optical fiber ) having an Abbe number (νd) having an optical constant in the range of about 55 to 62 and having excellent chemical durability suitable for washing with warm pure water and the like. It is intended to be.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、本発明者らは鋭意試験研究を重ねた結果、従来具体
的に開示されていない特定組成範囲のＳｉＯ２−Ｂ２Ｏ
３ −ＴｉＯ ２ −Ａｌ２Ｏ３−ＺｒＯ２−ＢａＯ系ガラス
において、上記のＬａ ２ Ｏ ３ や有害な成分を含有せず、
前記光学恒数を維持しつつ温純水洗浄等に適合する化学
的耐久性を有する光学ガラス（光ファイバー用を除く）
が得られることをみいだし、本発明をなすに至った。特
に、試験研究の過程で温純水洗浄に必要な化学的耐久性
を調べたところガラス研磨面の耐酸性の評価が適合して
おり、表面法での耐酸性を改良することにより本発明の
目的が達成されることがわかった。Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive tests and studies and found that SiO 2 —B 2 O of a specific composition range which has not been concretely disclosed hitherto.
In 3 -TiO 2 -Al 2 O 3 -ZrO 2 -BaO -based glass, without containing the above-mentioned La 2 O 3 or harmful components,
Optical glass (except for optical fiber) having chemical durability suitable for cleaning with warm pure water while maintaining the optical constant
Have been obtained, and the present invention has been accomplished. In particular, when the chemical durability required for hot pure water cleaning was examined in the course of the test and study, the evaluation of the acid resistance of the polished glass surface was suitable, and the object of the present invention was to improve the acid resistance by the surface method. It turned out to be achieved.
【０００５】本発明にかかる光学ガラスの特徴は、重量
％でＳｉＯ２２５〜４５％、Ｂ２Ｏ３５〜２０％、Ａｌ
２Ｏ３３〜８％、ＴｉＯ２ ０．０５〜３％、ＺｒＯ
２０．５〜８％、ＭｇＯ ０〜３％、ＣａＯ ０〜２
％、ＢａＯ ３７〜５５％、 Ｌｉ２Ｏ＋Ｎａ２Ｏ＋Ｋ
２Ｏ ０〜８％、Ｓｂ２Ｏ３０〜０．５％の各成分を含
有し、且つＬａ ２ Ｏ ３ 、ＰｂＯ、ＺｎＯ、およびＡｓ ２
Ｏ ３ は含有しないことである。The characteristics of the optical glass according to the present invention are as follows: 25 to 45% of SiO 2 , 5 to 20% of B 2 O 3 ,
2 O 3 3~8%, TiO 2 0.05 ~3%, ZrO
2 0.5-8%, MgO 0-3%, CaO 0-2
%, BaO 37~55%, Li 2 O + Na 2 O + K
2 O 0 to 8%, contain Sb 2 O 3 0~0.5% of each component, and La 2 O 3, PbO, ZnO , and As 2
O 3 is not contained .
【０００６】上記各成分の組成範囲を限定した理由は、
次のとおりである。すなわち、ＳｉＯ2成分の量は２５
％未満であるとガラスの化学的耐久性が低下し、またそ
の量が４５％を超えるとガラスの溶融性が悪化すると共
に、本発明の目標とする光学恒数を維持できなくなる。
Ｂ2Ｏ3成分は、その量が５％未満であるとガラス溶融時
の粘性が増大して均質なガラスを得難くなり、またその
量が２０％を超えるとガラスの化学的耐久性が低下す
る。Ａｌ2Ｏ3成分は化学的耐久性向上に特に有効な成分
であるが、その量が３％未満ではその効果を得難く、ま
た８％を超えるとガラスの溶融性および耐失透性が悪化
する。The reasons for limiting the composition ranges of the above components are as follows.
It is as follows. That is, the amount of the SiO 2 component is 25
%, The chemical durability of the glass decreases, and if the amount exceeds 45%, the melting property of the glass deteriorates, and the optical constants targeted by the present invention cannot be maintained.
If the amount of the B 2 O 3 component is less than 5%, the viscosity at the time of melting the glass increases, making it difficult to obtain a homogeneous glass, and if the amount exceeds 20%, the chemical durability of the glass decreases. I do. The Al 2 O 3 component is a particularly effective component for improving the chemical durability, but if its amount is less than 3%, it is difficult to obtain the effect, and if it exceeds 8%, the melting property and the devitrification resistance of the glass deteriorate. I do.
【０００７】ＴｉＯ２成分は化学的耐久性向上に有効な
成分であるが、その量が０．０５％未満では十分な効果
が得られず、またその量が増すと光線透過性を悪化させ
るので３％以下が好ましい。ＺｒＯ２成分は化学的耐久
性、特に表面法での耐酸性の評価において極めて有効な
成分であるが、その量が０．５％未満ではその効果が小
さく、またその量が８％を超えるとガラスの耐失透性を
悪化させる。ＭｇＯ成分は光学恒数の調整および溶融性
の改善のため有効な成分であるが、その量が３％を超え
ると耐失透性が悪化する。ＣａＯ成分は光学恒数の調整
および溶融性の改善のため有効な成分であるが、その量
が２％を超えると化学的耐久性、特に表面法での耐酸性
を悪化する。The TiO 2 component is a component effective for improving the chemical durability, but if its amount is less than 0.05%, a sufficient effect is obtained.
Is not obtained, and when the amount is increased, the light transmittance is deteriorated. The ZrO 2 component is a very effective component in the evaluation of chemical durability, particularly acid resistance by the surface method, but if its amount is less than 0.5%, its effect is small, and if its amount exceeds 8%, It degrades the devitrification resistance of the glass. The MgO component is an effective component for adjusting the optical constants and improving the melting property, but if its amount exceeds 3%, the devitrification resistance deteriorates. The CaO component is an effective component for adjusting the optical constant and improving the melting property. However, if its content exceeds 2%, the chemical durability , particularly the acid resistance by the surface method, is deteriorated.
【０００８】ＢａＯ成分は所望の光学恒数を維持し、ガ
ラスの耐失透性を向上させる重要な成分であるが、その
量が３７％未満ではその効果が得られず、また５５％を
超えるとガラスの化学的耐久性が悪化し、さらに溶融時
の粘性が増大し、均質なガラスを得られなくなる。Ｌｉ
２Ｏ、Ｎａ２ＯおよびＫ２Ｏ成分は溶融性を改善するの
に有効であるが、それらの１種または２種以上の合計量
が８％を超えると、化学的耐久性が悪化し、また所望の
光学恒数が維持できなくなる。Ｓｂ２Ｏ３成分はガラス
溶融時の脱泡剤として有効な成分であるが、その量は
０．５％以下で十分である。The BaO component is an important component for maintaining a desired optical constant and improving the devitrification resistance of the glass. If its content is less than 37%, its effect cannot be obtained, and its content exceeds 55%. In addition, the chemical durability of the glass deteriorates, and the viscosity at the time of melting increases, so that a homogeneous glass cannot be obtained. Li
The 2 O, Na 2 O and K 2 O components are effective for improving the meltability, but when the total amount of one or more of them exceeds 8%, the chemical durability deteriorates, Also, a desired optical constant cannot be maintained. The Sb 2 O 3 component is an effective component as a defoaming agent when the glass is melted, but the amount of 0.5% or less is sufficient.
【０００９】[0009]
【実施例】次に、本発明の光学ガラスにかかる好適な実
施組成例（Ｎｏ．１〜Ｎｏ．７）および従来のガラス比
較例（Ｎｏ．ＡおよびＮｏ．Ｂ）を、これらのガラスの
光学恒数（Ｎｄ、νｄ）と、表面法での耐酸性（ＳＲ）
侵蝕時間の測定結果と共に表１に示した。Next, preferred composition examples (No. 1 to No. 7) and conventional glass comparative examples (No. A and No. B) concerning the optical glass of the present invention will be described. Constant (Nd, νd) and acid resistance (SR) by surface method
The results are shown in Table 1 together with the measurement results of the erosion time.
【００１０】[0010]
【表１】 [Table 1]
【００１１】なお、上記ＳＲ侵蝕時間は国際標準化機構
ＩＳＯ８４２４：１９８７（Ｅ）の測定方法に準拠して
おり、所定の酸処理液中で研磨したガラス試料が０．１
μｍの侵食を受けるのに要した時間（ｈｒ）を示してい
る。ここで処理液としては、ｐＨ４．６の酢酸緩衝液を
用いている。従ってＳＲ値は０．１μｍの侵食に要した
時間が長い程、耐久性が良いことになる。The SR erosion time is based on the measuring method of International Standards Organization ISO 8424: 1987 (E), and the glass sample polished in a predetermined acid treatment liquid is 0.1%.
The time (hr) required to undergo μm erosion is shown. Here, an acetate buffer having a pH of 4.6 was used as the treatment liquid. Therefore, the longer the time required for the erosion of the SR value of 0.1 μm, the better the durability.
【００１２】表１に見られるとおり、本発明の実施例の
ガラスは、ほぼ同等の光学恒数を有する比較例Ａおよび
Ｂと比較すると、いずれもＳＲ侵蝕時間が長くなってお
り、一段と優れた化学的耐久性を示している。そのため
温純水洗浄に十分耐えることができる。尚、本発明のガ
ラスは、炭酸塩、硝酸塩、酸化物等の通常の光学ガラス
用原料を秤量混合し、これを白金坩堝等を用いて約１２
００〜１４００℃の温度で約２〜５時間溶融均質化後、
金型に鋳込み冷却することにより容易に得ることができ
る。As can be seen in Table 1, the embodiment of the present invention
The glasses were compared with Comparative Example A, which had approximately the same optical constants, and
As compared with B, the SR erosion time was longer in each case, indicating even more excellent chemical durability. Therefore, it can withstand washing with warm pure water sufficiently. The gas of the present invention
The glass was weighed and mixed with ordinary optical glass materials such as carbonates, nitrates and oxides, and this was mixed for about 12 hours using a platinum crucible or the like.
After melt homogenization at a temperature of 00 to 1400 ° C. for about 2 to 5 hours,
It can be easily obtained by casting into a mold and cooling.
【００１３】[0013]
【発明の効果】以上述べたとおり、本発明の光学ガラス
（但し、光ファイバー用を除く）は特定組成範囲のＳｉ
Ｏ２−Ｂ２Ｏ３ −ＴｉＯ ２ −Ａｌ２Ｏ３−ＺｒＯ２−Ｂ
ａＯ系ガラスであり、Ｌａ ２ Ｏ ３ や環境上問題になるＰ
ｂＯ、ＺｎＯ、およびＡｓ２Ｏ３成分を含有せず、屈折
率（Ｎｄ）が約１．６０〜１．６５、アッベ数（νｄ）
が約５５〜６２の範囲の光学恒数を有し、また従来のガ
ラスに比べて化学的耐久性に優れているため、温純水洗
浄等に十分耐えられ、さらに溶融性も良好であって量産
性に優れている。As described above, the optical glass of the present invention
(However, except for optical fiber) is Si of specific composition range
O 2 -B 2 O 3 -TiO 2 -Al 2 O 3 -ZrO 2 -B
aO-based glass, La 2 O 3 and P
bO, ZnO, and As 2 O 3 does not contain a component, the refractive index (Nd) of about 1.60 to 1.65, an Abbe's number ([nu] d)
Has an optical constant in the range of about 55 to 62 , and is more excellent in chemical durability than conventional glass, so that it can sufficiently withstand washing with warm pure water and the like, and has good melting properties and mass productivity. Is excellent.
フロントページの続き (56)参考文献 特開 平３−5341（ＪＰ，Ａ) 特開 昭62−70245（ＪＰ，Ａ) 特開 昭58−60640（ＪＰ，Ａ)Continuation of the front page (56) References JP-A-3-5341 (JP, A) JP-A-62-270245 (JP, A) JP-A-58-60640 (JP, A)
Claims (1)
３５〜２０％、Ａｌ２Ｏ３３〜８％、ＴｉＯ２ ０．０５
〜３％、ＺｒＯ２０．５〜８％、ＭｇＯ ０〜３％、Ｃ
ａＯ０〜２％、ＢａＯ ３７〜５５％、Ｌｉ２Ｏ＋Ｎａ
２Ｏ＋Ｋ２Ｏ ０〜８％、Ｓｂ２Ｏ３０〜０．５％の範
囲の各成分を含有しながらも、Ｌａ ２ Ｏ ３ 、ＰｂＯ、Ｚ
ｎＯ、Ａｓ ２ Ｏ ３ については含有せず、更に屈折率（Ｎ
ｄ）約１．６０〜１．６５、アッベ数（νｄ）約５５〜
６２の範囲の光学恒数を有することを特徴とする光学ガ
ラス（但し、光ファイバー用を除く）。(1) 25% to 45% by weight of SiO 2 , B 2 O
3 5~20%, Al 2 O 3 3~8%, TiO 2 0.05
~3%, ZrO 2 0.5~8%, 0~3% MgO, C
aO0~2%, BaO 37~55%, Li 2 O + Na
La 2 O 3 , PbO, Z while containing each component in the range of 0 to 8% of 2 O + K 2 O and 0 to 0.5% of Sb 2 O 3
nO and As 2 O 3 are not contained, and the refractive index (N
d) about 1.60 to 1.65, Abbe number (νd) about 55
An optical glass having an optical constant in the range of 62 (except for optical fibers) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4280730A JP2714915B2 (en) | 1992-09-25 | 1992-09-25 | Optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4280730A JP2714915B2 (en) | 1992-09-25 | 1992-09-25 | Optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06107424A JPH06107424A (en) | 1994-04-19 |
| JP2714915B2 true JP2714915B2 (en) | 1998-02-16 |
Family
ID=17629151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4280730A Expired - Fee Related JP2714915B2 (en) | 1992-09-25 | 1992-09-25 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2714915B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19703391C1 (en) * | 1997-01-30 | 1998-02-26 | Schott Glaswerke | A lead-free optical crown glass |
| DE19733580C2 (en) * | 1997-08-02 | 2001-05-23 | Schott Glas | Lead-free optical heavy-duty and double heavy-duty glasses |
| JP4370686B2 (en) * | 1999-06-09 | 2009-11-25 | 旭硝子株式会社 | Barium borosilicate glass and glass ceramic composition |
| CN111333316B (en) * | 2020-03-06 | 2022-04-15 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
| CN111204969A (en) * | 2020-03-06 | 2020-05-29 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
| CN111320382A (en) * | 2020-03-06 | 2020-06-23 | 成都光明光电股份有限公司 | Optical glass |
| CN111204970A (en) * | 2020-03-06 | 2020-05-29 | 成都光明光电股份有限公司 | Optical glass, glass preform and optical element |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5860640A (en) * | 1981-10-01 | 1983-04-11 | Hoya Corp | Optical glass |
| JPS6270245A (en) * | 1985-09-20 | 1987-03-31 | Hoya Corp | Optical fiber having environmental resistance |
| JP2535407B2 (en) * | 1989-05-31 | 1996-09-18 | ホーヤ株式会社 | Optical glass |
-
1992
- 1992-09-25 JP JP4280730A patent/JP2714915B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06107424A (en) | 1994-04-19 |
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