JPH0971435A - High-dispersion optical glass - Google Patents
High-dispersion optical glassInfo
- Publication number
- JPH0971435A JPH0971435A JP24881295A JP24881295A JPH0971435A JP H0971435 A JPH0971435 A JP H0971435A JP 24881295 A JP24881295 A JP 24881295A JP 24881295 A JP24881295 A JP 24881295A JP H0971435 A JPH0971435 A JP H0971435A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- component
- optical glass
- devitrification
- dispersion optical
- 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
- 239000005304 optical glass Substances 0.000 title claims abstract description 13
- 239000006185 dispersion Substances 0.000 title claims abstract description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 238000004031 devitrification Methods 0.000 abstract description 17
- 230000003287 optical effect Effects 0.000 abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910016264 Bi2 O3 Inorganic materials 0.000 abstract 1
- 229910019639 Nb2 O5 Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 34
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 206010040925 Skin striae Diseases 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Glass Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、屈折率（ｎｄ）が
１．５８〜１．８２、アッベ数（νｄ）が２０〜４０の
範囲の光学恒数を有し、かつ、ＰｂＯ成分を含まない特
定組成域のＳｉＯ2−Ｎｂ2Ｏ5−Ｂｉ2Ｏ3−Ｒ’2Ｏ（た
だし、Ｒ’はＬｉ、Ｎａ、Ｋを示す。）系の高分散光学
ガラスに関する。TECHNICAL FIELD The present invention has an optical constant having a refractive index (nd) of 1.58 to 1.82 and an Abbe number (νd) of 20 to 40, and contains a PbO component. The present invention relates to a SiO 2 —Nb 2 O 5 —Bi 2 O 3 —R ′ 2 O (where R ′ represents Li, Na, and K) based high-dispersion optical glass having a specific composition range.
【０００２】[0002]
【従来の技術】従来、前記の光学恒数を有するガラスと
しては、ＳｉＯ2−ＰｂＯ−Ｒ’2Ｏ系が知られている
が、このガラスはＰｂＯ成分を含有しており、かつ、黄
色に着色し易いうえにガラスの比重が高くなるため使用
上不利である。特開昭５２−２５８１２号公報には、Ｓ
ｉＯ2−ＴｉＯ2−Ｎｂ2Ｏ5−Ｒ’2Ｏ系のガラスが開示
されているが、このガラスは、本発明の目標とする高分
散特性および耐失透性の双方を十分に満足するものとは
言い難い。 2. Description of the Related Art Conventionally, as a glass having the above optical constant, SiO 2 --PbO--R ' 2 O system is known, but this glass contains a PbO component and is yellow. It is disadvantageous in use because it is easily colored and the specific gravity of glass becomes high. In Japanese Patent Laid-Open No. 52-25812, S
Although an iO 2 —TiO 2 —Nb 2 O 5 —R ′ 2 O type glass is disclosed, this glass sufficiently satisfies both the high dispersion characteristics and the devitrification resistance targeted by the present invention. Hard to say.
【０００３】さらに、特開平５−２６２５３４号公報に
は、ＳｉＯ2−Ｎｂ2Ｏ5−Ｒ’2Ｏ−Ｆ系の高分散性光学
ガラスが開示されているが、このガラスは、Ｆ（弗素）
の揮発による組成変動から脈理や失透が発生しやすく、
品質劣化を招きやすい。Further, JP-A-5-262534 discloses a SiO 2 —Nb 2 O 5 —R ′ 2 O—F type high-dispersion optical glass, which is F (fluorine). )
Striae and devitrification tend to occur due to compositional changes due to volatilization of
It is easy to cause quality deterioration.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、前記従来の
ガラスにみられる諸欠点を総合的に改善し、屈折率（ｎ
ｄ）１．５８〜１．８２、アッベ数（νｄ）２０〜４０
の範囲の光学恒数を有し、かつ、耐失透性を改善した高
分散光学ガラスを提供することを目的にしている。DISCLOSURE OF THE INVENTION The present invention comprehensively improves the various drawbacks of the above-mentioned conventional glass, and improves the refractive index (n
d) 1.58 to 1.82, Abbe number (νd) 20 to 40
It is an object of the present invention to provide a high-dispersion optical glass having an optical constant in the range of 1 and improved devitrification resistance.
【０００５】[0005]
【課題を解決するための手段】本発明者は、前記の目的
を達成するため鋭意試験研究を重ねた結果、従来には具
体的に開示されていない特定組成範囲のＳｉＯ2−Ｎｂ2
Ｏ5−Ｂｉ2Ｏ3−Ｒ’2Ｏ系のガラスにおいて、所望の光
学恒数を有し、かつ、一段と耐失透性を改善したガラス
が得られることを見いだし本発明をなすに至った。The present inventor has conducted extensive studies in order to achieve the above object, and as a result, has found that SiO 2 —Nb 2 having a specific composition range not specifically disclosed in the past.
In O 5 -Bi 2 O 3 -R ' 2 O -based glass having a desired optical constants, and has led to further form of the present invention found that glass having improved devitrification resistance can be obtained .
【０００６】前記目的を達成する本発明にかかる高分散
光学ガラスの組成の特徴は、特許請求の範囲に記載のと
おり、重量％で、 ＳｉＯ2 ２０〜４６％、 Ｂ2Ｏ3 ０〜 ７％、 Ａｌ2Ｏ3 ０〜 ５％、 Ｎｂ2Ｏ5 ２０〜５５％、 ＴｉＯ2 ０〜１４％、 ＷＯ3 ０〜１５％、 Ｂｉ2Ｏ3 ０．５〜２０％、 ＲＯ（ただし、ＲはＭｇ、Ｃａ、Ｓｒ、Ｂａを示す。）
０〜１０％、 Ｒ’2Ｏ（ただし、Ｒ’はＬｉ、Ｎａ、Ｋを示す。）
１０〜３０％、を含有することにある。The characteristics of the composition of the high-dispersion optical glass according to the present invention which achieves the above object are, as described in the claims, in terms of weight% SiO 2 20 to 46%, B 2 O 3 0 to 7%. , Al 2 O 3 0 to 5%, Nb 2 O 5 20 to 55%, TiO 2 0 to 14%, WO 3 0 to 15%, Bi 2 O 3 0.5 to 20%, RO (where R is (Indicates Mg, Ca, Sr, Ba.)
0~10%, R '2 O (provided that, R' represents Li, Na, and K.)
10 to 30%.
【０００７】上記のとおり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
は、ガラスを形成させる必須の成分であるが、その量が
２０％未満であるとガラスの化学的耐久性が低下し、ま
た、４６％を超えるとガラスの溶融性が悪化するので２
０〜４６％の範囲にすべきである。Ｂ2Ｏ3成分は、ガラ
スの溶融性向上のため化学的耐久性を悪化しない範囲内
の７％まで添加し得る。The reason for limiting the composition range of each component as described above is as follows. That is, the SiO 2 component is an essential component for forming glass, but if the amount is less than 20%, the chemical durability of the glass decreases, and if it exceeds 46%, the meltability of the glass deteriorates. Because 2
It should be in the range of 0-46%. The B 2 O 3 component can be added up to 7% within the range where chemical durability is not deteriorated in order to improve the melting property of glass.
【０００８】Ａｌ2Ｏ3成分は、光学恒数の調整およびガ
ラスの安定性向上のため適宜添加し得るが、その量が５
％を超えると溶融性が悪化し均質なガラスが得難くな
る。Ｎｂ2Ｏ5成分は、後述のＢｉ2Ｏ3成分と共にガラス
に含有させることによって高い光線透過性を維持しつつ
高分散能を高める効果がある重要な成分であるが、その
量が２０％未満では目標の光学恒数が得られず、また、
５５％を超えるとガラスの失透傾向が大きくなるので、
２０〜５５％の範囲にすべきである。The Al 2 O 3 component can be appropriately added for the purpose of adjusting the optical constant and improving the stability of the glass, but the amount is 5
%, The meltability deteriorates and it becomes difficult to obtain a homogeneous glass. The Nb 2 O 5 component is an important component that has the effect of enhancing the high dispersibility while maintaining high light transmittance by containing it in the glass together with the Bi 2 O 3 component described below, but the amount is less than 20%. Does not give the target optical constant, and
If it exceeds 55%, the devitrification tendency of the glass increases, so
It should be in the range of 20-55%.
【０００９】ＴｉＯ2成分は、ガラスの屈折率を高め、
アッベ数を小さくするのに有効であるので適宜添加し得
るが、その量が１４％を超えるとガラスの着色が増大す
る。ＷＯ3成分は、ガラスの屈折率を高め、失透傾向を
抑制する効果があるので添加し得るが、その量が１５％
を超えるとかえって失透しやすくなる。Ｂｉ2Ｏ3成分
は、屈折率を高め、また、上記Ｎｂ2Ｏ5成分と共に含有
させることによって高分散能を著しく高める効果がある
が、０．５％未満ではその効果が十分ではなく、また、
２０％を超えるとガラスの耐失透性および光線透過性が
悪化するので、より好ましい範囲は０．５〜１５％とす
べきである。The TiO 2 component increases the refractive index of glass,
Since it is effective for reducing the Abbe number, it can be added appropriately, but if the amount exceeds 14%, coloring of the glass increases. The WO 3 component can be added because it has the effect of increasing the refractive index of glass and suppressing the tendency of devitrification, but its amount is 15%.
If it exceeds, devitrification tends to occur. The Bi 2 O 3 component has the effect of increasing the refractive index and, when contained together with the Nb 2 O 5 component, has the effect of remarkably increasing the high dispersibility, but if it is less than 0.5%, the effect is not sufficient, and ,
If it exceeds 20%, the devitrification resistance and light transmittance of the glass deteriorate, so a more preferable range should be 0.5 to 15%.
【００１０】ＲＯ成分、すなわちＭｇＯ、ＣａＯ、Ｓｒ
Ｏ、およびＢａＯの各成分は、ガラスの溶融性改善に効
果があるので任意に添加し得るが、これらの成分の１種
または２種以上の合計量が１０％を超えると目標の光学
恒数を維持し難くなる。Ｒ’2Ｏ成分、すなわちＬｉ
2Ｏ、Ｎａ2Ｏ、およびＫ2Ｏの各成分は、いずれもガラ
スの溶融性を促進する効果があるので任意に添加し得る
が、これらの成分の合計量が１０％未満ではその効果が
不十分であり、また３０％を超えると耐失透性が悪化す
る。なお、本発明のガラスには、上記成分の他に公知の
脱泡剤であるＡｓ2Ｏ3およびＳｂ2Ｏ3を１％程度まで含
有させることができる。RO component, namely MgO, CaO, Sr
Each component of O and BaO is effective in improving the melting property of glass, and thus can be added arbitrarily. However, when the total amount of one or more of these components exceeds 10%, the target optical constant is exceeded. Becomes difficult to maintain. R '2 O component, i.e. Li
Each of the components 2 O, Na 2 O, and K 2 O has an effect of promoting the meltability of glass, and thus can be added arbitrarily, but if the total amount of these components is less than 10%, the effect is not achieved. If it exceeds 30%, the devitrification resistance deteriorates. The glass of the present invention may contain As 2 O 3 and Sb 2 O 3 , which are known defoamers, in addition to the above components up to about 1%.
【００１１】[0011]
【発明の実施の形態】つぎに、本発明にかかる高分散光
学ガラスの好適な実施組成例（Ｎｏ．１〜Ｎｏ．７）お
よび従来の光学ガラスの比較組成例（Ｎｏ．ＡおよびＮ
ｏ．Ｂ）をこれらのガラスの屈折率（ｎｄ）、アッベ数
（νｄ）および失透試験結果と共に表１に示した。BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred examples of compositions of the high-dispersion optical glass according to the present invention (No. 1 to No. 7) and comparative compositions of conventional optical glass (Nos. A and N).
o. B) is shown in Table 1 together with the refractive index (nd), Abbe number (νd) and devitrification test results of these glasses.
【００１２】[0012]
【表１】 [Table 1]
【表１】 [Table 1]
【００１３】表記のガラスは、いずれも通常の光学ガラ
ス原料を用いて調合、混合し、白金坩堝を用い、約１２
００〜１４００℃、約２〜５時間で溶融脱泡し、攪拌均
質化した後、ブロック形状に成形し徐冷して得た。な
お、表１における失透試験結果は、白金製５０ｃｃポッ
トにガラス試料８０ｇを入れて電気炉内で各ガラスの溶
融性の難易度に応じて１１００〜１３００℃の温度で２
時間溶融した後、降温して各試料を１０５０℃、１００
０℃で２時間保温した後、炉外に取り出して失透の有無
を顕微鏡により観察したもので、その結果、失透が認め
られないガラスは○印で、また、失透が認められたガラ
スは×印で示した。Each of the glasses described above is prepared and mixed by using ordinary optical glass raw materials, and a platinum crucible is used to prepare about 12 glass.
It was obtained by melting and defoaming at 00 to 1400 ° C. for about 2 to 5 hours, stirring and homogenizing, then molding into a block shape and gradually cooling. In addition, the devitrification test result in Table 1 shows that at a temperature of 1100 to 1300 ° C., 80 g of a glass sample was put in a 50 cc pot made of platinum and the temperature was 1100 to 1300 ° C. depending on the degree of meltability of each glass in an electric furnace.
After melting for a period of time, the temperature was lowered and each sample was heated at 1050 ° C for 100
After keeping the temperature at 0 ° C for 2 hours, it was taken out of the furnace and observed for devitrification with a microscope. As a result, the glass without devitrification is indicated by a circle, and the glass with devitrification was observed. Is indicated by a cross.
【００１４】表１に見られるとおり、本発明の実施例は
いずれも従来公知の比較例ガラスと比較して耐失透性に
優れており、目的の改善効果は顕著である。As can be seen from Table 1, each of the examples of the present invention is superior in devitrification resistance as compared with the conventionally known comparative glass, and the intended improvement effect is remarkable.
【００１５】なお、前記実施例のガラスＮｏ．４および
Ｎｏ．５は記載していないが、転移温度が５５０℃以下
であるため、モールドプレス用素材としても適してい
る。In addition, the glass No. 4 and no. Although 5 is not described, since it has a transition temperature of 550 ° C. or lower, it is also suitable as a material for mold pressing.
【００１６】[0016]
【発明の効果】上述のとおり、本発明の高分散光学ガラ
スは、特定範囲量のＳｉＯ2−Ｎｂ2Ｏ5−Ｂｉ2Ｏ3−
Ｒ’2Ｏ系組成の高分散光学ガラスであるから、屈折率
（ｎｄ）が１．５８〜１．８２、アッベ数（νｄ）が２
０〜４０の光学恒数を有すると共に、従来のガラスに比
べて耐失透性に優れており、また、モールドプレス用ガ
ラスにも適しているので有用である。As described above, the high-dispersion optical glass of the present invention has a specific range amount of SiO 2 —Nb 2 O 5 —Bi 2 O 3 —.
Since it is a high-dispersion optical glass having an R ′ 2 O-based composition, it has a refractive index (nd) of 1.58 to 1.82 and an Abbe number (νd) of 2.
It is useful because it has an optical constant of 0 to 40, is excellent in devitrification resistance as compared with conventional glass, and is also suitable for glass for mold pressing.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成７年１１月２９日[Submission date] November 29, 1995
【手続補正１】[Procedure amendment 1]
【補正対象書類名】図面[Document name to be amended] Drawing
【補正対象項目名】図１[Correction target item name] Fig. 1
【補正方法】削除[Correction method] Deleted
Claims (1)
０〜１０％、 Ｒ’2Ｏ（ただし、Ｒ’はＬｉ、Ｎａ、Ｋを示す。）
１０〜３０％、の範囲の各成分を含有することを特
徴とする高分散光学ガラス。1. A weight%, SiO 2 20~46%, B 2 O 3 0~ 7%, Al 2 O 3 0~ 5%, Nb 2 O 5 20~55%, TiO 2 0~14%, WO 3 0 to 15%, Bi 2 O 3 0.5 to 20%, RO (wherein R represents Mg, Ca, Sr and Ba)
0~10%, R '2 O (provided that, R' represents Li, Na, and K.)
A high-dispersion optical glass containing each component in the range of 10 to 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24881295A JP3791946B2 (en) | 1995-09-01 | 1995-09-01 | High dispersion optical glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24881295A JP3791946B2 (en) | 1995-09-01 | 1995-09-01 | High dispersion optical glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0971435A true JPH0971435A (en) | 1997-03-18 |
| JP3791946B2 JP3791946B2 (en) | 2006-06-28 |
Family
ID=17183781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24881295A Expired - Fee Related JP3791946B2 (en) | 1995-09-01 | 1995-09-01 | High dispersion optical glass |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3791946B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6413894B1 (en) * | 1998-04-30 | 2002-07-02 | Hoya Corporation | Optical glass and optical product |
| JP2010105902A (en) * | 2008-09-30 | 2010-05-13 | Ohara Inc | Optical glass and method for suppressing deterioration of spectral transmittance |
| JP2017105703A (en) * | 2015-12-07 | 2017-06-15 | 株式会社オハラ | Optical glass, preform and optical element |
| CN109987838A (en) * | 2019-04-24 | 2019-07-09 | 成都光明光电股份有限公司 | Optical glass, gas preform, optical element and optical instrument |
-
1995
- 1995-09-01 JP JP24881295A patent/JP3791946B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6413894B1 (en) * | 1998-04-30 | 2002-07-02 | Hoya Corporation | Optical glass and optical product |
| JP2010105902A (en) * | 2008-09-30 | 2010-05-13 | Ohara Inc | Optical glass and method for suppressing deterioration of spectral transmittance |
| JP2017105703A (en) * | 2015-12-07 | 2017-06-15 | 株式会社オハラ | Optical glass, preform and optical element |
| CN109987838A (en) * | 2019-04-24 | 2019-07-09 | 成都光明光电股份有限公司 | Optical glass, gas preform, optical element and optical instrument |
| CN109987838B (en) * | 2019-04-24 | 2022-04-15 | 成都光明光电股份有限公司 | Optical glass, glass preform, optical element and optical instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3791946B2 (en) | 2006-06-28 |
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