JPS61227939A - Special borosilicate crown optical glass - Google Patents
Special borosilicate crown optical glassInfo
- Publication number
- JPS61227939A JPS61227939A JP6665885A JP6665885A JPS61227939A JP S61227939 A JPS61227939 A JP S61227939A JP 6665885 A JP6665885 A JP 6665885A JP 6665885 A JP6665885 A JP 6665885A JP S61227939 A JPS61227939 A JP S61227939A
- Authority
- JP
- Japan
- Prior art keywords
- optical glass
- refractive index
- borosilicate crown
- special
- special borosilicate
- 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
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
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
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)
本発明は特殊硼珪クラウン光学硝子に関すム(従来の技
術)
従来の光学硝子にはPK (弗珪クラウン光学硝子)
を除いては、屈折率nd がt45〜t48の範囲にあ
るものはなかった。[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a special borosilicate crown optical glass (prior art).
Except for , there was no material whose refractive index nd was in the range of t45 to t48.
(発明が解決しようとする問題)
本発明はF’K のもつような低屈折率(nd:1.4
5〜1.48 )をもちfJがらも、アツベ数も60〜
85でアシ、化学的耐久性が優れ、無色透明な光学硝子
を提供しようとするものである。(Problem to be Solved by the Invention) The present invention solves the problem of low refractive index (nd: 1.4) such as that of F'K.
5 to 1.48) and fJ, but the Atsbe number is 60 to
It is an object of the present invention to provide an optical glass that is clear, colorless, and has excellent chemical durability.
(問題点を解決するための手段)
ちなわち、本発明は、重量%でSin、:66%〜49
% 、 BIOI: 21L5%〜!! 1 % 、
Nano。(Means for solving the problem) In other words, the present invention has a weight percentage of Sin of: 66% to 49%.
%, BIOI: 21L5%~! ! 1%,
Nano.
K、O及びA/40.よシなる群の1種又は2種以上の
酸化物を5−以下及びAs1O1: (L 1 %−α
4%よりなる特殊硼珪クラウン光学硝子である。K, O and A/40. One or more oxides of different groups are 5- or less and As1O1: (L 1 %-α
This is a special borosilicate crown optical glass made of 4%.
本発明の特殊硼珪クラクン光学硝子は、その組成に弗化
物を含まないという特徴をもつもので、その製造時弗素
ガス発生に対する心配がなく、シかもPK のような硬
度の不足もないという長所を有するものである。The special borosilicate optical glass of the present invention has the advantage that it does not contain fluoride in its composition, so there is no concern about fluorine gas generation during its manufacture, and there is no lack of hardness as in PK glass. It has the following.
以下、本発明の特殊硼珪クラウン光学硝子の組成限定理
由につき説明する。The reasons for limiting the composition of the special borosilicate crown optical glass of the present invention will be explained below.
810、を66チ〜69%の範囲に限定したのは、66
チ以下では得られる光学硝子の屈折率が所望値よシ大き
くな〉、また69%をこえると失透するからである。B
xOsを2 a5%〜31チの範囲にとったのは、2a
5%以下であると、製造した硝子の屈折率が要望値よル
大きくカシ、iた311をこえると失透を示すからであ
る。810, was limited to the range of 66ch to 69%.
This is because if the refractive index of the optical glass is less than 69%, the refractive index of the obtained optical glass will be greater than the desired value, and if it exceeds 69%, devitrification will occur. B
The reason for setting xOs in the range of 2a5% to 31chi is 2a
If it is less than 5%, the refractive index of the manufactured glass will be higher than the desired value, and if it exceeds 311, it will show devitrification.
また、[10,Nano、 A40Bの各組成を単独で
あるいは複数でも計3%以下の範囲で加えるのは、8
i o、とBsOs の二成分のみでは失透を生じ、
5チを越えると製造した硝子の屈折率が所望値を越える
からである。A句OBは硝子溶解時消泡作用を行うが、
(L1%〜cL4qlIに限定したのは、α4チをこえ
ると屈折率が所望値をこえ、α1チ以下では消泡作用が
不十分であるからである。In addition, adding each composition of [10, Nano, A40B singly or in combination within a range of 3% or less is 8
Only two components of i o and BsOs cause devitrification,
This is because if it exceeds 5 inches, the refractive index of the manufactured glass will exceed the desired value. Clause A OB has an antifoaming effect during glass melting, but
(The reason why it is limited to L1% to cL4qlI is because if it exceeds α4, the refractive index exceeds the desired value, and if it is less than α1, the defoaming effect is insufficient.
本発明の特殊硼珪クラウン光学硝子は、各組成の原料と
してそれぞれ対応する酸化物、硝酸塩を所望の割合に混
合し、バッチを作シ、これを1300℃〜1450℃に
加熱した電気炉中のアルミナ坩堝に入れ、溶融清澄後、
攪拌冷却することによって製造し得る。The special borosilicate crown optical glass of the present invention is produced by mixing the corresponding oxides and nitrates in the desired proportions as raw materials for each composition, making a batch, and heating it in an electric furnace at 1300°C to 1450°C. After melting and clarifying in an alumina crucible,
It can be produced by stirring and cooling.
以下、本発明の一実施例を下表に示す。An example of the present invention is shown in the table below.
第1表Table 1
Claims (1)
28.5%〜31%、Na_2O、K_2O及びAl_
2O_3よりなる群の1種又は2種以上の酸化物を3%
以下及びAs_2O_3:0.1%〜0.4%よりなる
特殊硼珪クラウン光学硝子。SiO_2: 66% to 69%, B_2O_3: by weight%
28.5% to 31%, Na_2O, K_2O and Al_
3% of one or more oxides of the group consisting of 2O_3
A special borosilicate crown optical glass consisting of the following and As_2O_3: 0.1% to 0.4%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6665885A JPS61227939A (en) | 1985-04-01 | 1985-04-01 | Special borosilicate crown optical glass |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6665885A JPS61227939A (en) | 1985-04-01 | 1985-04-01 | Special borosilicate crown optical glass |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61227939A true JPS61227939A (en) | 1986-10-11 |
JPH0425218B2 JPH0425218B2 (en) | 1992-04-30 |
Family
ID=13322216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6665885A Granted JPS61227939A (en) | 1985-04-01 | 1985-04-01 | Special borosilicate crown optical glass |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61227939A (en) |
-
1985
- 1985-04-01 JP JP6665885A patent/JPS61227939A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0425218B2 (en) | 1992-04-30 |
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