JPH0425218B2 - - Google Patents
Info
- Publication number
- JPH0425218B2 JPH0425218B2 JP6665885A JP6665885A JPH0425218B2 JP H0425218 B2 JPH0425218 B2 JP H0425218B2 JP 6665885 A JP6665885 A JP 6665885A JP 6665885 A JP6665885 A JP 6665885A JP H0425218 B2 JPH0425218 B2 JP H0425218B2
- Authority
- JP
- Japan
- Prior art keywords
- optical glass
- present
- refractive index
- exceeds
- special
- 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
Links
- 239000005304 optical glass Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- 230000003254 anti-foaming effect Effects 0.000 description 2
- 238000004031 devitrification Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 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
- C03C3/076—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)
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る。
（従来の技術）
従来の光学硝子にはFK（弗珪クラウン光学硝
子）を除いては、屈折率ndが1.45〜1.48の範囲に
あるものはなかつた。
（発明が解決しようとする問題）
本発明はFKのもつような低屈折率（nd：1.45
〜1.48）をもちながらも、アツベ数も60〜85であ
り、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。
（問題点を解決するための手段）
ちなわち、本発明は、重量％でSiO2：66％〜
69％，B2O3：28.5％〜31％，Na2O，K2O及び
Al2O3よりなる群の１種又は２種以上の酸化物を
３％以下及びAs2O3：0.1％〜0.4％よりなる特殊
硼珪クラウン光学硝子である。
本発明の特殊硼珪クラウン光学硝子は、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必配がなく、し
かもFK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。
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。
SiO2を66％〜69％の範囲に限定したのは、66
％以下では得られる光学硝子の屈折率が所望値よ
り大きくなり、また69％をこえると失透するから
である。B2O3を2.85％〜31％の範囲にとつたの
は、28.5％以下であると、製造した硝子の屈折率
が要望値より大きくなり、また31％をこえると失
透を示すからである。また、K2O，Na2O，
Al2O3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、SiO2とB2O3の二成分
のみでは失透を生じ、３％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。As2O3
は硝子溶解時消泡作用を行うが、0.1％〜0.4％に
限定したのは、0.4％をこえると屈折率が所望値
をこえ、0.1％以下では消泡作用が不十分である
からである。
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、バツチを作り、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、撹拌冷却することによつて製
造し得る。
以下、本発明の一実施例を下表に示す。
【表】DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a special borosilicate crown optical glass. (Prior Art) No conventional optical glass has a refractive index nd in the range of 1.45 to 1.48, except for FK (fluorosilic crown optical glass). (Problem to be solved by the invention) The present invention solves the problem of low refractive index (nd: 1.45) such as that of FK.
~1.48), the Atsube number is 60 to 85, and the objective is to provide a colorless and transparent optical glass with excellent chemical durability. (Means for solving the problem) Specifically, the present invention provides SiO 2 :66% to 66% by weight.
69%, B2O3 : 28.5%~31%, Na2O , K2O and
This is a special borosilicate crown optical glass containing 3% or less of one or more oxides of the group consisting of Al 2 O 3 and 0.1% to 0.4% As 2 O 3 . The special borosilicate crown optical glass of the present invention is characterized in that its composition does not contain fluoride.
It has the advantage of not having to deal with the generation of fluorine gas during its manufacture, and also not lacking in hardness like FK. The reasons for limiting the composition of the special borosilicate crown optical glass of the present invention will be explained below. The SiO 2 was limited to a range of 66% to 69% because 66
% or less, the refractive index of the optical glass obtained will be higher than the desired value, and if it exceeds 69%, it will devitrify. The reason for setting B 2 O 3 in the range of 2.85% to 31% is because if it is less than 28.5%, the refractive index of the manufactured glass will be higher than the desired value, and if it exceeds 31%, it will show devitrification. . Also, K 2 O, Na 2 O,
A total of 3% of each composition of Al 2 O 3 , singly or in combination
The reason why they are added in the following range is because if only the two components SiO 2 and B 2 O 3 are used, devitrification occurs, and if it exceeds 3%, the refractive index of the manufactured glass will exceed the desired value. As2O3 _
has an antifoaming effect when glass is melted, but it is limited to 0.1% to 0.4% because if it exceeds 0.4%, the refractive index exceeds the desired value, and if it is less than 0.1%, the antifoaming effect is insufficient. . The special borosilica 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 then
It can be produced by placing it in an alumina crucible in an electric furnace heated to 1450°C, melting and clarifying it, and then cooling it with stirring. An example of the present invention is shown in the table below. 【table】
Claims (1)
〜31％，Na2O，K2O及びAl2O3よりなる群の１
種又は２種以上の酸化物を３％以下及びAs2O3：
0.1％〜0.4％よりなる特殊硼珪クラウン光学硝
子。1% by weight SiO 2 : 66% to 69%, B 2 O 3 : 28.5%
~31%, 1 of the group consisting of Na 2 O, K 2 O and Al 2 O 3
Species or 2 or more oxides up to 3% and As 2 O 3 :
Special borosilicate crown optical glass consisting of 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 JPS61227939A (en) | 1986-10-11 |
| JPH0425218B2 true 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 |
|---|---|
| JPS61227939A (en) | 1986-10-11 |
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