JPS5983960A - Glass having anomalous dispersion - Google Patents

Glass having anomalous dispersion

Info

Publication number
JPS5983960A
JPS5983960A JP19483882A JP19483882A JPS5983960A JP S5983960 A JPS5983960 A JP S5983960A JP 19483882 A JP19483882 A JP 19483882A JP 19483882 A JP19483882 A JP 19483882A JP S5983960 A JPS5983960 A JP S5983960A
Authority
JP
Japan
Prior art keywords
glass
caf2
anomalous dispersion
alf3
6mol
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
JP19483882A
Other languages
Japanese (ja)
Other versions
JPH0420860B2 (en
Inventor
Keiji Okuda
啓二 奥田
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP19483882A priority Critical patent/JPS5983960A/en
Publication of JPS5983960A publication Critical patent/JPS5983960A/en
Publication of JPH0420860B2 publication Critical patent/JPH0420860B2/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
    • C03C3/12—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)

Abstract

PURPOSE:Optical glass suitable for mass production, satisfying optical performance, having >=400 deg.C glass transition temperature, containing AlF3, Al(PO3)3 and CaF2 in a specific ratio. CONSTITUTION:Glass having anomalous dispersion consisting of 35-44mol% AlF3, 1.5-5.5mol% Al(PO3)3, with the proviso that 37.5-46.5mol% AlF3+ Al(PO3)3, 10-43mol% CaF2, 0-18mol% MgF2, with the proviso that 20- 45mol% CaF2+MgF2, 0-30mol% SrF2, 0-25mol% BaF2, with proviso that 17-30mol% SrF2+BaF2, 0-12mol% NaF, 0-12mol% YF3, 0-8mol% LaF3, 0-6mol% EuF3, 0-6mol% GdF3, 0-6mol% TbF3, 0-7mol% DyF3, and 0- 6wt% YbF3. The glass is obtained by melting each of the components at 800- 1,000 deg.C using a device such as a platinum crucible, etc., uniforming it with stirring, casting it into a mold, followed by annealing.

Description

【発明の詳細な説明】 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。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorophosphate optical glass having a large anomalous dispersion and a low refractive index and low dispersion.

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大 分散度の褥きな光学材料を用いることは知られている。BACKGROUND ART Conventionally, it has been known to use a flexible optical material with an anomalous large dispersion degree in a long focal length lens system such as a telephoto lens in order to correct chromatic aberration of higher-order spectra.

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。Fluorite is an example of such an optical material, but it is expensive and has poor processability, making it unsuitable for mass production.

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。Fluorophosphate optical glasses are available to improve these drawbacks.

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）か８５以」二、屈折率（ｎｄ）が１４１〜
１４６、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、４ｏｏ℃以−トのガラス転
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。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) of 141 to
146 and an anomalous dispersion (△PgF) of 0.04 or more, the objective is to obtain an optical glass that has a glass transition temperature of 40°C or higher and is suitable for mass production. It is.

そして、−１−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。In order to achieve the object -1-, the optical glass according to the present invention is characterized by having the following composition range in mol% (hereinafter simply abbreviated as %).

ＡｔＦ３３５〜４４ Ａｚ（ＰＯ３）３　　１．５〜５．５ 但し、Ａ／−Ｆ３　＋　Ａｚ（Ｆ０３）３３７．５〜４
６５ＣａＦ２　　　　　１０−４３ ＭｇＦｚ　　　　　　　　Ｏ〜１８ 但し、ＣａＦｚ　十ＭｇＦｚ　　　　２０〜４５ＳｒＦ
２　　　　　　０〜３０ ＢａＦ２　　　　　　０〜２５ 但し、ＳｒＦ２＋ＢａＦ２１７−３Ｏ ＮａＦ　　　　　　　　　Ｏ〜１２ ＹＦ’３　　　　　　　　　Ｑ〜１２ ＬａＦ３　　　　　　０〜８ ＥｕＦ３　　　　　　０〜６ ＧｄＦ３　　　　　　　ｏ〜　６ ＴｂＦ３　　　　　　０〜６ ■）ＹＦ３　　　　　　　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
。AtF335~44 Az(PO3)3 1.5~5.5 However, A/-F3 + Az(F03)337.5~4
65CaF2 10-43 MgFz O~18 However, CaFz 10 MgFz 20~45SrF
2 0~30 BaF2 0~25 However, SrF2+BaF217-3O NaF O~12 YF'3 Q~12 LaF3 0~8 EuF3 0~6 GdF3 o~ 6 TbF3 0~6 ■) YF3 0~7 YbF3 0~6° Below, the reason for limiting the range of each of the above components will be explained in order.

ｅず、　ＡｔＦ３１ｉ　Ｈ５：ｌ　Ｇ形成す６為゛′不
可欠“成域であり、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
。Ａｚ（ＰＯ３）３　　もガラスを形成する為に不可欠
な成分であり、１５％以下ではガラス化しないし、５５
％以」二になると目的とする低分散が得られない。特に
Ａｚ（ＰＯ３）３を３８％以下とすると９２以」二のよ
り低分散を得ることができる。更に、ＡｚＦ３＋Ａｚ（
ＰＯａ）ａの含量は３７５〜４６５％の範囲を出ると９
産に耐える安定性が得られない。However, AtF31i H5:l G formation is an ``indispensable'' region, and below 35%, the desired low dispersion (
If it exceeds 44%, stability (especially stability against devitrification) that can withstand mass production cannot be obtained. Az(PO3)3 is also an essential component to form glass, and if it is less than 15%, it will not vitrify, and 55% or less will not vitrify.
% or more, the desired low dispersion cannot be obtained. In particular, when Az(PO3)3 is 38% or less, a lower dispersion of 92 or higher can be obtained. Furthermore, AzF3+Az(
The content of POa)a is 9 when it leaves the range of 375-465%.
Stability that can withstand stress is not achieved.

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
になるとガラスか安定化しない。ＭｇＦｚもガラスを安
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、１８％以上ではかえっ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、Ｃ
ａＦｚ　＋ＭｇＦｚの合量は２０・〜４５％でなければ
ならない。CaF2 is a component for stabilizing the glass and obtaining a low refractive index and low dispersion, and if it is less than 10% or more than 43%, the glass will not be stabilized. MgFz is also a component for stabilizing the glass and obtaining a low refractive index and low dispersion, but if it exceeds 18%, the glass will not become stable. Here, in order to obtain a stable low refractive index and low dispersion glass, C
The total amount of aFz + MgFz must be 20.~45%.

５ｒＦｚ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か、これが３０％以」−にな
るとガラスが安定しない。ＢａＦｚ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
散共に筒くなり所望の光学性能が得られない。５ｒＦｚ
　−１−ＢａＦ２の合量は、ガラスの安定化の為に不可
欠であり、これが１７％以下でくする為の成分であるか
、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。5rFz is a component for stabilizing the glass and obtaining a low refractive index and low dispersion.If it exceeds 30%, the glass will not be stable. BaFz is a component particularly for stabilizing glass, but if it exceeds 25%, both the refractive index and dispersion become cylindrical, making it impossible to obtain the desired optical performance. 5rFz
The total amount of -1-BaF2 is essential for stabilizing the glass, and if it is less than 17% it is a necessary component, or if it is more than 12% it lowers the glass transition temperature and post-treatment is difficult. Become.

ＹＦ３．ＬａＦ３．ＥｕＦ３．ＧｄＦａ　、ＴｂＦａ　
、ＤｙＦ３及びＹｂＦ　ａは全てガラスの安定性を増す
為の成分であるか、順に、１２．８，６，６，６，７．
６％以上となるとかえってガラスが安定しない。更に、
ＹＦａ　−１−ＬａＦ３−１−　ＥｕＦ３−１−　Ｇｄ
Ｆａ十ＴｂＦ３＋　Ｉ）ＹＦ３＋ＹｂＦ３の合量を旧５
〜１２％とすることによって４４５℃以上の高いガラス
転移温度を得ることができる。YF3. LaF3. EuF3. GdFa, TbFa
, DyF3 and YbF a are all components for increasing the stability of the glass, or 12.8, 6, 6, 6, 7.
If it exceeds 6%, the glass will become unstable. Furthermore,
YFa -1-LaF3-1- EuF3-1- Gd
Fa + TbF3 + I) The total amount of YF3 + YbF3 is the old 5
By setting the content to 12%, a high glass transition temperature of 445° C. or higher can be obtained.

尚、ＳｒＦ２とＢａＦ２とにツイテ、５ｒＦｚ　：　９
−３０％、ＢａＦ２：　Ｑ〜８％とすれば更に好ましい
。これは、ＢａＦｚ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。In addition, tweet about SrF2 and BaF2, 5rFz: 9
-30%, BaF2: Q~8% is more preferable. This is because as BaFz increases, the dispersion increases and the degree of anomalous dispersion decreases, making it difficult to achieve the desired optical performance, so 8% or less is sufficient.

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℃で溶融し、バＪ拌均質化した後
に鋳型に鋳込み、徐冷することによって製造される。The glass according to the present invention is manufactured by melting each component at 800-1000° C. using a device such as a platinum crucible, homogenizing the melt by stirring, and then pouring into a mold and slowly cooling.

以下、本発明の実施例の成分組成、屈折率（ｎｄ）。The component composition and refractive index (nd) of Examples of the present invention are shown below.

アツベ数（νｄ）及びガラス転移温度（Ｔｇ）を表に示
す。The Atsube number (vd) and glass transition temperature (Tg) are shown in the table.

表中、成分組成はモル％にてあられし、−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［＝度か未測
定であることを示す。In the table, the component composition is expressed in mol%, and the - column indicates that the component is not included or that the glass transition [=degrees] is not measured.

特開昭５９−８３９６０（３）Japanese Patent Publication No. 59-83960 (3)

Claims (1)

【特許請求の範囲】 １、モル％で下記組成範囲がら成ることを特徴とする異
常分散ガラス； ＡｚＦａ　　　　　３５〜４４ Ａｔ（ＰＯａ）３１．５〜５．５ 但し、ＡｔＦａ　＋Ａｔ（ＰＯａ）ａ　　　３７．！５
〜４６．５ＣａＦ２１ｏ〜４３ ＭｇＦ２Ｏ〜１８ 但し、ＣａＦ２−１−　ＭｇＦ２２０〜４５ＳｒＦ２ｏ
〜３゜ ＢａＦ２０〜２５ 但し、５ｒＦ２−）−ＢａＦｚ　　　　　　１７〜３Ｏ
ＮａＦ　　　　　　Ｏ〜１２ ＹＦ３ｏ〜１２ ＬａＦ３０〜８ ＥｕＦａ　　　　　Ｏ〜６ ＧｄＦ３　　　　　　０〜６ ＴｂＦａ　　　　　　　　Ｏ〜　６ ＤｙＦ３　　　　　　０〜７ ＹｂＦ３　　　　　　０〜６゜ 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； ５ｒＦ２９〜３０ ＢａＦ２ｏ〜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； Ａｚ（ＰＯａ）ｓ　　　１．５〜３．８゜４、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項から第３項までのいずれかに記載の異常分散
ガラス； ＹＦａ　＋ＬａＦａ　−１−ＥｕＦａ　＋ＧｄＦａ　＋
ＴｂＦａ　−１−ＤｙＦａ　−１−ＹｂＦａＯ３１５〜
１２゜[Claims] 1. An anomalous dispersion glass characterized by comprising the following composition range in mol%: AzFa 35-44 At(POa) 31.5-5.5, provided that AtFa + At(POa)a 37. ! 5
~46.5CaF21o~43 MgF2O~18 However, CaF2-1- MgF220~45SrF2o
~3゜BaF20~25 However, 5rF2-)-BaFz 17~3O
A patent claim characterized in that NaFO~12 YF3o~12 LaF30~8 EuFa O~6 GdF3 0~6 TbFa O~6 DyF3 0~7 YbF3 0~6°2, and further satisfies the following conditions in mol% The anomalous dispersion glass according to claim 1, which has a range of 5rF29-30 BaF2o-8°3, and further satisfies the following conditions in terms of mol%. Glass; Az(POa)s 1.5 to 3.8°4, and further satisfies the following conditions in mol% according to any one of claims 1 to 3. Anomalous dispersion glass; YFa +LaFa -1-EuFa +GdFa +
TbFa -1-DyFa -1-YbFaO315~
12°
JP19483882A 1982-11-06 1982-11-06 Glass having anomalous dispersion Granted JPS5983960A (en)

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 true JPS5983960A (en) 1984-05-15
JPH0420860B2 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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60210545A (en) * 1984-03-30 1985-10-23 Ohara Inc Optical fluorophosphate glass
JPH02311326A (en) * 1989-05-26 1990-12-26 Hoya Corp Low dispersion-type optical glass
US5246891A (en) * 1990-05-07 1993-09-21 Nikon Corporation Light-weight optical glass of fluoro-phosphate
CN103539359A (en) * 2013-09-27 2014-01-29 南京邮电大学 Rare earth doped fluoride micro-nano crystal-fluorophosphate glass composite 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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60210545A (en) * 1984-03-30 1985-10-23 Ohara Inc Optical fluorophosphate glass
JPH02311326A (en) * 1989-05-26 1990-12-26 Hoya Corp Low dispersion-type optical glass
US5246891A (en) * 1990-05-07 1993-09-21 Nikon Corporation Light-weight optical glass of fluoro-phosphate
CN103539359A (en) * 2013-09-27 2014-01-29 南京邮电大学 Rare earth doped fluoride micro-nano crystal-fluorophosphate glass composite 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

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