JPH0420860B2 - - Google Patents
Info
- Publication number
- JPH0420860B2 JPH0420860B2 JP19483882A JP19483882A JPH0420860B2 JP H0420860 B2 JPH0420860 B2 JP H0420860B2 JP 19483882 A JP19483882 A JP 19483882A JP 19483882 A JP19483882 A JP 19483882A JP H0420860 B2 JPH0420860 B2 JP H0420860B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- baf
- srf
- dispersion
- component
- 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
- 239000011521 glass Substances 0.000 claims description 19
- 239000006185 dispersion Substances 0.000 claims description 18
- 229910016036 BaF 2 Inorganic materials 0.000 claims description 10
- 230000002547 anomalous effect Effects 0.000 claims description 7
- 229910016569 AlF 3 Inorganic materials 0.000 claims description 5
- 229910016655 EuF 3 Inorganic materials 0.000 claims description 5
- 229910005690 GdF 3 Inorganic materials 0.000 claims description 5
- 229910017768 LaF 3 Inorganic materials 0.000 claims description 5
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910009520 YbF3 Inorganic materials 0.000 claims description 2
- 101100274801 Caenorhabditis elegans dyf-3 gene Proteins 0.000 claims 1
- 229910016468 DyF3 Inorganic materials 0.000 claims 1
- 230000009477 glass transition Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000005304 optical glass Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- DWYMPOCYEZONEA-UHFFFAOYSA-L fluoridophosphate Chemical compound [O-]P([O-])(F)=O DWYMPOCYEZONEA-UHFFFAOYSA-L 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- -1 SrF 2 : 9 to 30 % Inorganic materials 0.000 description 1
- 229910004296 TbF Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004031 devitrification Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003756 stirring Methods 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
- C03C3/12—Silica-free oxide glass compositions
- C03C3/23—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron
- C03C3/247—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron containing fluorine and phosphorus
-
- 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
- C03C3/32—Non-oxide glass compositions, e.g. binary or ternary halides, sulfides or nitrides of germanium, selenium or tellurium
- C03C3/325—Fluoride glasses
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
本発明は、異常分散度が大きく低屈折率低分散
の弗燐酸塩系光学ガラスに関する。
従来、望遠レンズなどの長焦点レンズ系におい
て、高次スペクトルの色収差を補正する為に異常
分散度の大きな光学材料を用いることは知られて
いる。このような光学材料として螢石があるが、
これは高価格な上に加工性が悪く量産に適さな
い。このような欠点を改良するものとしては、弗
燐酸塩系光学ガラスがある。
本発明は上記弗燐酸塩系光学ガラスの改良に関
し、アツベ数（νd）が85以上、屈折率（nd）が
1.41〜1.46、かつ異常分散度（△PgF）が0.04以
上という光学性能を満足しつつ、400℃以上のガ
ラス転移温度を有し、量産に適した光学ガラスを
得ることを目的とするものである。
そして、上記目的達成の為、本発明に係る光学
ガラスはモル％（以下、単に％と略す）で下記組
成範囲からなることを特徴とするものである。
AlF3 35〜44
Al（PO3）3 1.5〜5.5
但し、AlF3＋Al（PO3）3 37.5〜46.5
CaF2 10〜43
MgF2 ０〜18
但し、CAF2＋MgF2 20〜45
SrF2 ０〜30
BaF2 ０〜25
但し、SrF2＋BaF2 17〜30
NaF ０〜12
YF3 ０〜12
LaF3 ０〜８
EuF3 ０〜６
GdF3 ０〜６
TbF3 ０〜６
DyF3 ０〜７
YbF3 ０〜６。
以下、上記各成分の範囲限定理由について順に
説明する。
まず、AIF3はガラスを形成する為に不可欠な
成分であり、35％以下では目的とする低分散（高
いアツベ数）が得られず、44％以上になると量産
に耐える安定性（特に失透に対する安定性）が得
られない。Al（PO3）3もガラスを形成する為に不
可欠な成分であり、1.5％以下ではガラス化しな
いし、5.5％以上になると目的とする低分散が得
られない。特にAl（PO3）3を3.8％以下とすると92
以上のより低分散を得ることができる。更に、
AlF3＋Al（PO3）3の合量は37.5〜46.5％の範囲を
出ると量産に耐える安定性が得られない。
CaF2はガラスを安定化させるとともに低屈折
率低分散を得る為の成分であり、10％以下または
43％以上となるとガラスが安定化しない。MgF2
もガラスを安定化されるとともに低屈折率低分散
を得る為の成分であるが、18％以上ではかえつて
ガラスが安定しない。ここで、安定した低屈折率
低分散ガラスを得る為には、CaF2＋MgF2の合量
は20〜45％でなければならない。
SrF2は、ガラスを安定化させるとともに低屈
折率低分散を得る為の成分であるが、これが30％
以上になるとガラスが安定しない。BaF2は、特
にガラスを安定化する為の成分であるが、25％以
上では屈折率、分散共に高くなり所望の光学性能
が得られない。SrF2＋BaF2の合量は、ガラスの
安定化の為の不可欠であり、これが17％以下でも
30％以上でもガラスは不安定となる。
NaFは、ガラスの安定性を増すと共に分散を
低くする為の成分であるが、12％以上ではガラス
転移温度を下げてしまい後処理が困難となる。
YF3、LaF3、EuF3、GdF3、TbF3、DyF3及び
YbF3は全てガラスの安定性を増す為の成分であ
るが、順に、12、８、６、６、６、７、６％以上
となるとかえつてガラスが安定しない。更に、
YF3＋LaF3＋EuF3＋GdF3＋TbF3＋DyF3＋
YbF3の合量を0.15〜12％とすることによつて445
℃以上の高いガラス転移温度を得ることができ
る。
尚、SrF2とBaF2とについて、SrF2：９〜30
％、BaF2：０〜８％とすれば更に好ましい。こ
れは、BaF2が多くなると分散が高くなるととも
に異常分散度が低くなり所望の光学性能に到達し
にくくなるので、８％以下で充分だからである。
本発明に係るガラスは、白金坩堝等の装置を用
いて各成分を800〜1000℃で溶解し、撹拌均質化
した後に鋳型に鋳込み、徐冷することによつて製
造される。
以下、本発明の実施例の成分組成、屈折率
（nd）、アツベ数（νd）及びガラス転移温度
（Tg）を表に示す。表中、成分組成はモル％にて
あらわし、一の欄はその成分が含まれていないこ
ともしくはガラス転移温度が未測定であることを
示す。
The present invention relates to a fluorophosphate optical glass having a large anomalous dispersion and a low refractive index and low dispersion. Conventionally, it has been known to use optical materials with large anomalous dispersion in long focal length lens systems such as telephoto lenses in order to correct chromatic aberration of higher-order spectra. Fluorite is an example of such an optical material.
This is expensive and has poor processability, making it unsuitable for mass production. Fluorophosphate optical glasses are available to improve these drawbacks. The present invention relates to the improvement of the above-mentioned fluorophosphate optical glass, which has an Abbe number (νd) of 85 or more and a refractive index (nd).
The objective is to obtain an optical glass that satisfies the optical performance of 1.41 to 1.46 and anomalous dispersion (△PgF) of 0.04 or higher, has a glass transition temperature of 400°C or higher, and is suitable for mass production. . In order to achieve the above object, the optical glass according to the present invention is characterized by having the following composition range in mol% (hereinafter simply abbreviated as %). AlF 3 35-44 Al(PO 3 ) 3 1.5-5.5 However, AlF 3 +Al(PO 3 ) 3 37.5-46.5 CaF 2 10-43 MgF 2 0-18 However, CAF 2 +MgF 2 20-45 SrF 2 0- 30 BaF 2 0-25 However, SrF 2 +BaF 2 17-30 NaF 0-12 YF 3 0-12 LaF 3 0-8 EuF 3 0-6 GdF 3 0-6 TbF 3 0-6 DyF 3 0-7 YbF 3 0-6. Below, the reason for limiting the range of each of the above components will be explained in order. First of all, AIF 3 is an essential component for forming glass, and if it is less than 35%, the desired low dispersion (high Atsube number) cannot be obtained, and if it is more than 44%, it may not be stable enough for mass production (especially devitrification). stability) cannot be obtained. Al(PO 3 ) 3 is also an essential component for forming glass, and if it is less than 1.5%, it will not vitrify, and if it is more than 5.5%, the desired low dispersion cannot be obtained. Especially when Al( PO3 ) 3 is 3.8% or less, 92
It is possible to obtain lower dispersion than above. Furthermore,
If the total amount of AlF 3 +Al(PO 3 ) 3 exceeds the range of 37.5 to 46.5%, stability that can withstand mass production cannot be obtained. CaF 2 is a component to stabilize the glass and obtain a low refractive index and low dispersion.
If it exceeds 43%, the glass will not be stabilized. MgF2
It is also a component that stabilizes the glass and obtains a low refractive index and low dispersion, but if it exceeds 18%, the glass will become unstable. Here, in order to obtain a stable low refractive index and low dispersion glass, the total amount of CaF 2 +MgF 2 must be 20 to 45%. SrF 2 is a component that stabilizes the glass and obtains a low refractive index and low dispersion, but it accounts for 30%
Above this level, the glass becomes unstable. BaF 2 is a component particularly for stabilizing glass, but if it exceeds 25%, both the refractive index and dispersion increase, making it impossible to obtain the desired optical performance. The total amount of SrF 2 + BaF 2 is essential for stabilizing the glass, and even if it is less than 17%,
Glass becomes unstable even if it exceeds 30%. NaF is a component that increases the stability of the glass and lowers its dispersion, but if it exceeds 12%, it lowers the glass transition temperature, making post-treatment difficult. YF 3 , LaF 3 , EuF 3 , GdF 3 , TbF 3 , DyF 3 and
All YbF 3 is a component for increasing the stability of the glass, but if it exceeds 12, 8, 6, 6, 6, 7, and 6% in that order, the glass becomes unstable. Furthermore,
YF 3 +LaF 3 +EuF 3 +GdF 3 +TbF 3 +DyF 3 +
445 by setting the total amount of YbF3 to 0.15 to 12%.
A high glass transition temperature of ℃ or higher can be obtained. Regarding SrF 2 and BaF 2 , SrF 2 : 9 to 30
%, BaF 2 :0 to 8% is more preferable. This is because as BaF 2 increases, dispersion increases and anomalous dispersion decreases, making it difficult to achieve the desired optical performance, so 8% or less is sufficient. The glass according to the present invention is produced by melting each component at 800 to 1000° C. using a device such as a platinum crucible, stirring to homogenize, then casting into a mold and slowly cooling. The table below shows the component composition, refractive index (nd), Abbe's number (νd), and glass transition temperature (Tg) of Examples of the present invention. In the table, the component composition is expressed in mol%, and the column 1 indicates that the component is not included or that the glass transition temperature has not been measured.
【表】【table】
Claims (1)
する異常分散ガラス； AlF3 35〜44 Al（PO3）3 1.5〜5.5 但し、AlF3＋Al（PO3）3 37.5〜46.5 CAF2 10〜43 MgF2 ０〜18 但し、CaF2＋MgF2 20〜45 SrF2 ０〜30 BaF2 ０〜25 但し、SrF2＋BaF2 17〜30 NaF ０〜12 YF3 ０〜12 LaF3 ０〜８ EuF3 ０〜６ GdF3 ０〜６ TbF3 ０〜６ DyF3 ０〜７ YbF3 ０〜６ 但し、YF3＋LaF3＋EuF3＋GdF3＋TbF3＋
DyF3＋YbF3 0.15〜12。 ２ 更に、モル％で下記条件を満足することを特
徴とする特許請求の範囲第１項記載の異常分散ガ
ラス； SrF2 ９〜30 BaF2 ０〜８。 ３ 更に、モル％で下記条件を満足することを特
徴とする特許請求の範囲第１項又は第２項記載の
異常分散ガラス； Al（PO3）3 1.5〜3.8。 [Claims] An anomalous dispersion glass characterized by comprising the following composition range at 1 mol %: AlF 3 35-44 Al(PO 3 ) 3 1.5-5.5, provided that AlF 3 +Al(PO 3 ) 3 37.5- 46.5 CAF 2 10-43 MgF 2 0-18 However, CaF 2 + MgF 2 20-45 SrF 2 0-30 BaF 2 0-25 However, SrF 2 + BaF 2 17-30 NaF 0-12 YF 3 0-12 LaF 3 0~8 EuF 3 0~6 GdF 3 0~6 TbF 3 0~6 DyF 3 0~7 YbF 3 0~6 However, YF 3 +LaF 3 +EuF 3 +GdF 3 +TbF 3 +
DyF3 + YbF3 0.15~12. 2. The anomalous dispersion glass according to claim 1, which further satisfies the following conditions in terms of mol%: SrF 2 9-30 BaF 2 0-8. 3. The anomalous dispersion glass according to claim 1 or 2, which further satisfies the following conditions in mol%: Al( PO3 ) 3 1.5 to 3.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19483882A JPS5983960A (en) | 1982-11-06 | 1982-11-06 | Glass having anomalous dispersion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19483882A JPS5983960A (en) | 1982-11-06 | 1982-11-06 | Glass having anomalous dispersion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5983960A JPS5983960A (en) | 1984-05-15 |
| JPH0420860B2 true JPH0420860B2 (en) | 1992-04-07 |
Family
ID=16331105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19483882A Granted JPS5983960A (en) | 1982-11-06 | 1982-11-06 | Glass having anomalous dispersion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5983960A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60210545A (en) * | 1984-03-30 | 1985-10-23 | Ohara Inc | Optical fluorophosphate glass |
| JP2796122B2 (en) * | 1989-05-26 | 1998-09-10 | ホーヤ株式会社 | Low dispersion optical glass and method for producing the same |
| US5246891A (en) * | 1990-05-07 | 1993-09-21 | Nikon Corporation | Light-weight optical glass of fluoro-phosphate |
| CN103539359B (en) * | 2013-09-27 | 2015-10-21 | 南京邮电大学 | Rare-earth-doped fluoride micro-nano crystalline substance-fluorine phosphorous glass matrix material and preparation method thereof |
| WO2019142397A1 (en) * | 2018-01-18 | 2019-07-25 | 株式会社ニコン | Optical glass, optical element equipped with optical glass, and optical device |
-
1982
- 1982-11-06 JP JP19483882A patent/JPS5983960A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5983960A (en) | 1984-05-15 |
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