JPS61227939A - Special borosilicate crown optical glass - Google Patents

Special borosilicate crown optical glass

Info

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
Application number
JP6665885A
Other languages
Japanese (ja)
Other versions
JPH0425218B2 (en
Inventor
Eiichi Akatsu
赤津　榮一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP6665885A priority Critical patent/JPS61227939A/en
Publication of JPS61227939A publication Critical patent/JPS61227939A/en
Publication of JPH0425218B2 publication Critical patent/JPH0425218B2/ja
Granted legal-status Critical Current

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

PURPOSE:To obtain the titled optical glass having superior chemical durability and sufficient hardness in spite of low refractive index by using a specified compsn. consisting of SiO2, B2O3, Na2O, K2O, Al2O3, and As2O3. CONSTITUTION:The special borosilicate crown glass consists of by wt% 66-69 SiO2, 28.5-31 B2O3, <=3 at least one among Na2O, K2O, Al2O3, and 0.1-0.4 As2O3. The optical glass has low refractive index and yet sufficient hardness, having superior chemical durability, colorless characteristic and transparency.

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)

【特許請求の範囲】[Claims] 重量％でＳｉＯ＿２：６６％〜６９％、Ｂ＿２Ｏ＿３：
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%.
JP6665885A 1985-04-01 1985-04-01 Special borosilicate crown optical glass Granted JPS61227939A (en)

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)

Also Published As

Publication number Publication date
JPH0425218B2 (en) 1992-04-30

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