JPS6332734B2 - - Google Patents

Info

Publication number
JPS6332734B2
JPS6332734B2 JP58005395A JP539583A JPS6332734B2 JP S6332734 B2 JPS6332734 B2 JP S6332734B2 JP 58005395 A JP58005395 A JP 58005395A JP 539583 A JP539583 A JP 539583A JP S6332734 B2 JPS6332734 B2 JP S6332734B2
Authority
JP
Japan
Prior art keywords
cao
tio
sio
sro
pbo
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
Application number
JP58005395A
Other languages
Japanese (ja)
Other versions
JPS58125637A (en
Inventor
Menneman Kaaru
Guriimerooto Georuku
Gairaa Fuorukumaa
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.)
Schott AG
Original Assignee
Schott Glaswerke AG
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 Schott Glaswerke AG filed Critical Schott Glaswerke AG
Publication of JPS58125637A publication Critical patent/JPS58125637A/en
Publication of JPS6332734B2 publication Critical patent/JPS6332734B2/ja
Granted legal-status Critical Current

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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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/066—Glass compositions containing silica with less than 40% silica by weight containing boron containing zinc
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
    • C03C3/074—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc

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)
  • Eyeglasses (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

発明の背景 本発明は、少なくとも1.79の屈折率および少な
くとも32の高いアツベ数を有する高屈折率で軽量
の光学ガラスに関するものである。該ガラスは、
遠視用の溶融タイプの眼鏡用として極めて好適で
ある。また、該ガラスはDE―OS30 26 605およ
びDE―OS31 21 284による軽量で高屈折率の近
視用眼鏡としても有用であり、その内容は本明細
書に援用される。 発明の技術分野 本発明は、ガラス組成物に関し、特に眼鏡レン
ズ、また特に高い屈折率を有する遠視用の溶融タ
イプの眼鏡用レンズ製造に好適なガラス組成物に
関するものである。 nd＝1.79を有する高屈折率の軽量ガラスのシリ
ーズは、例えばDE―PS2259183から公知である。
しかしながら、決定的な欠点として、これらのガ
ラスは、中心部の厚さが大きく（プラスレンズの
場合）かつ／または周縁部の厚さが大きい（マイ
ナスレンズの場合）という結果を残している。 低密度でかつ1.80の屈折率を有する眼鏡レンズ
も公知であり、例えばDE―AS28 24 891および
DE―AS28 24 982に記載されている。DE―
AS28 24 892に記載されているガラスは、29〜31
の極めて低いアツベ数を有するという欠点があ
る。残念ながら、干渉色縞が高いジオプトリー値
とともに増大するので、高いアツベ数を有するガ
ラスを要する者には、それは特に非常な欠点であ
り、これらの色縞は高いアツベ数によつてのみ減
少させることができる。この問題は、本発明のガ
ラスにより解決された。 DE―AS28 24 891に記載のガラスは、TiO2成
分を極めて多量含有しているので結晶安定性の点
から必要とされる要求に合致せず、これらの高い
TiO2含量は透光性にマイナスの効果を与えてい
る。さらに、それらの望ましくない粘度曲線のた
めに、これらのガラスは、DE―OS30 26 605お
よびDE―OS31 21 824に記載されているような
近視用眼鏡としては適当ではない。 発明の開示 したがつて、本発明の一般的目標は、軽量眼鏡
の製造に用いられる遠視用にも好適であり、眼鏡
の製造に用いられる近視用に好適なガラス組成物
を提供することにある。 本発明の他の目的は、高い屈折率を有してなる
ガラスを提供することにある。 本発明のさらに他の目的は、遠視用レンズであ
る改良された光学級のレンズを提供することにあ
る。 本発明の別の目的は、近視用レンズである改良
された光学級のレンズを提供することにある。 本発明のさらに別の目的は、新規なガラス組成
物から作られたレンズブランクおよび研磨された
眼鏡レンズを提供することにある。 明細書および特許請求の範囲を検討することに
より、本発明のさらに他の目的、特徴および利点
は、本発明の属する技術分野における通常の知識
を有する者にとつて明白となるであろう。 発明を実施するための最良の実施態様 簡単にいえば、本発明の上記およびその他の目
的、特徴および利点は、1.79〜1.82の屈折率、4.0
ｇ／cm3以下の密度およびできるだけ高い（少なく
とも32の）アツベ数を有する遠視用および近視用
の眼鏡用ガラスを提供することにより達成され
る。これらのガラスは、SiO2―B2O3―CaO―
La2O3―ZrO2―TiO2―Nb2O5―アルカリ酸化物
系に属し、かつつぎの組成（重量％）を有してい
る。 SiO2 7.5〜13.5 B2O3 13 〜19 Al2O3 0 〜 4 SiO2＋B2O3＋Al2O3＝ 24 〜30 Li2O 0 〜 3 Na2O 0 〜 4 K2O 0 〜 0 Li2O＋Na2O＝ 2 〜 6 CaO 4 〜18 MgO 0 〜 6 SrO 0 〜14 BaO 0 〜14 PbO 0 〜15 ZnO 0 〜 7 CaO＋MgO＋SrO＋BaO＋PbO＋ZnO＝
9 〜26 La2O3 13 〜30 Y2O3 0 〜6 Gd2O3 0 〜6 La2O3＋Y2O3＋Gd2O3＝ 17 〜31 ZrO2 3 〜 8 TiO2 5 〜13 Nb2O5 5 〜12 WO3 0 〜 6 TiO2＋Nb2O5＋WO3＝ 15 〜22 Ta2O5 0 〜 6 ガラス形成成分であるSiO2＋B2O3＋Al2O3は
24〜30重量％であり、２〜６重量％の割合のアル
カリ金属酸化物は混合物の溶融を容易にし、かつ
近視用ガラスとして使用する場合に必要とされる
80〜98×10-7の膨張係数α20〜300゜をも保障するた
めに必要である。 ４〜18重量％の割合のCaOは、屈折率を著しく
高くしかつ密度を低くする。二価金属の酸化物
（MgO，CaO，SrO，ZnO，PbO）の量は９〜26
重量％である。 必要とされる高い屈折率は、17〜31重量％の希
土類酸化物（La2O3＋Y2O3＋Cd2O3）の添加なし
には達成できない。３〜８重量％の割合のZrO2
も、同時にアツベ数を低下させることなく屈折率
を増加させる。TiO2，Nb2O5およびWO3は、ガ
ラスの密度の増加を最小にしながら屈折率を非常
に増大させる成分としての所定量使用される。特
に重要なことは、TiO2がより多く存在すると結
晶化の成長率を非常に増大させるので、TiO2成
分は13重量％以下にすべきである。 さらに詳細に検討しなくても、当業者であれば
前記記載に基づいて本発明をその最大の範囲まで
利用することができる。したがつて、以下の好ま
しい特定の実施例は、単に説明のためだけであつ
て開示の残余を限定するものではない。下記実施
例において、温度は摂氏であり、すべての部およ
びパーセントは重量による。 実施例 １〜８ 本発明によるガラスは、公知技術、例えば下記
の方法で製造された。すなわち、所定の式に基づ
いて各成分（酸化物、硝酸塩、炭酸塩）を秤量
し、清澄剤を添加し、かつ得られた組成物をよく
混合し、白金るつぼまたはセラミツクタブ内で
1250〜1300℃の温度で溶融した。清澄化しかつ撹
拌機により均質化したのち、ガラスを950〜1000
℃で鉄型に注入しかつ／または直接眼鏡ガラスブ
ランク（近視用および／または遠視用）に成形し
た。例として、８つの組成物を次表に示す。 BACKGROUND OF THE INVENTION The present invention relates to high refractive index, lightweight optical glasses having a refractive index of at least 1.79 and a high Abbe number of at least 32. The glass is
It is extremely suitable for use in fusion-type glasses for farsightedness. The glasses are also useful as lightweight, high-index myopic glasses according to DE-OS30 26 605 and DE-OS31 21 284, the contents of which are incorporated herein by reference. TECHNICAL FIELD OF THE INVENTION The present invention relates to a glass composition, and more particularly to a glass composition suitable for producing a spectacle lens, and particularly a melt-type spectacle lens for hyperopia having a high refractive index. A series of high refractive index lightweight glasses with nd=1.79 is known, for example from DE-PS2259183.
However, as a decisive drawback, these glasses result in a large thickness at the center (in the case of positive lenses) and/or a large thickness at the periphery (in the case of negative lenses). Spectacle lenses with low density and a refractive index of 1.80 are also known, for example DE-AS28 24 891 and
Described in DE-AS28 24 982. DE―
Glasses listed in AS28 24 892 are 29 to 31
It has the disadvantage of having an extremely low Atsube number. Unfortunately, it is a particularly great disadvantage for those who require glasses with high Atsube numbers, since the interference color fringes increase with high diopter values, and these color fringes can only be reduced by high Atsube numbers. Can be done. This problem has been solved by the glasses of the invention. The glass described in DE-AS28 24 891 does not meet the requirements from the point of view of crystal stability because it contains an extremely large amount of the TiO2 component.
TiO 2 content has a negative effect on translucency. Furthermore, because of their unfavorable viscosity curves, these glasses are not suitable as myopia glasses as described in DE-OS30 26 605 and DE-OS31 21 824. DISCLOSURE OF THE INVENTION It is therefore a general aim of the present invention to provide a glass composition that is also suitable for hyperopic use in the manufacture of lightweight eyeglasses and suitable for myopic use in the manufacture of eyeglasses. . Another object of the present invention is to provide a glass having a high refractive index. Yet another object of the present invention is to provide an improved optical grade lens for hyperopia. Another object of the invention is to provide an improved optical grade lens for myopia. Yet another object of the invention is to provide lens blanks and polished ophthalmic lenses made from the new glass compositions. Further objects, features, and advantages of the invention will be apparent to those skilled in the art to which the invention pertains from a study of the specification and claims. BEST MODE FOR CARRYING OUT THE INVENTION Briefly, the above and other objects, features and advantages of the present invention are realized by a refractive index of 1.79 to 1.82, 4.0
This is achieved by providing spectacle glasses for hyperopia and myopia with a density of less than g/cm 3 and an Abbé number as high as possible (at least 32). These glasses are SiO 2 ―B 2 O 3 ―CaO―
La 2 O 3 --ZrO 2 --TiO 2 --Nb 2 O 5 --Belongs to the alkali oxide family and has the following composition (wt%). SiO 2 7.5 ~ 13.5 B 2 O 3 13 ~ 19 Al 2 O 3 0 ~ 4 SiO 2 + B 2 O 3 + Al 2 O 3 = 24 ~ 30 Li 2 O 0 ~ 3 Na 2 O 0 ~ 4 K 2 O 0 ~ 0 Li 2 O + Na 2 O = 2 ~ 6 CaO 4 ~ 18 MgO 0 ~ 6 SrO 0 ~ 14 BaO 0 ~ 14 PbO 0 ~ 15 ZnO 0 ~ 7 CaO + MgO + SrO + BaO + PbO + ZnO =
9 ~ 26 La 2 O 3 13 ~ 30 Y 2 O 3 0 ~ 6 Gd 2 O 3 0 ~ 6 La 2 O 3 + Y 2 O 3 + Gd 2 O 3 = 17 ~ 31 ZrO 2 3 ~ 8 TiO 2 5 ~ 13 Nb 2 O 5 5 ~ 12 WO 3 0 ~ 6 TiO 2 + Nb 2 O 5 + WO 3 = 15 ~ 22 Ta 2 O 5 0 ~ 6 The glass forming component SiO 2 + B 2 O 3 + Al 2 O 3 is
24-30% by weight, and a proportion of alkali metal oxides of 2-6% by weight facilitates the melting of the mixture and is required when used as myopia glass.
This is necessary to ensure an expansion coefficient α of 80 to 98×10 −7 of 20 to 300 °. A proportion of CaO of 4 to 18% by weight significantly increases the refractive index and decreases the density. The amount of divalent metal oxides (MgO, CaO, SrO, ZnO, PbO) is 9 to 26
Weight%. The required high refractive index cannot be achieved without the addition of 17-31% by weight of rare earth oxides (La 2 O 3 +Y 2 O 3 +Cd 2 O 3 ). ZrO2 in a proportion of 3-8% by weight
also increases the refractive index without decreasing the Abbe number. TiO 2 , Nb 2 O 5 and WO 3 are used in certain amounts as components that greatly increase the refractive index while minimizing the increase in the density of the glass. Of particular importance, the TiO2 content should be below 13% by weight, since the presence of more TiO2 greatly increases the crystallization growth rate. Without further elaboration, one skilled in the art can, based on the preceding description, utilize the present invention to its fullest extent. Accordingly, the following specific preferred embodiments are merely illustrative and are not intended to limit the remainder of the disclosure. In the examples below, temperatures are in degrees Celsius and all parts and percentages are by weight. Examples 1 to 8 Glasses according to the invention were manufactured using known techniques, for example the following method. That is, each component (oxide, nitrate, carbonate) is weighed based on a predetermined formula, a clarifying agent is added, and the resulting composition is mixed well and placed in a platinum crucible or ceramic tub.
Melted at a temperature of 1250-1300 °C. After clarification and homogenization with a stirrer, the glass is
℃ in iron molds and/or directly formed into spectacle glass blanks (myopic and/or hyperopic). By way of example, eight compositions are shown in the table below.

【表】 前記実施例は、該実施例で特に用いられたこれ
らの一般的ならびに特定の反応成分および／また
は操作条件を置き換えることにより同様に繰り返
すことができる。前記記載から、当業者がその本
質を容易になすことができ、かつ本発明の精神お
よび範囲を逸脱することなく、種々の用途および
条件を用いて種々の変更をすることができる。 産業上利用の可能性 本明細書および実施例から明らかなように、本
発明は、眼鏡レンズ、特に軽量の二焦点レンズ用
の光学級のガラス組成物の工業的製造に有用であ
る。TABLE The above examples can be similarly repeated by substituting those general and specific reaction components and/or operating conditions specifically used in the examples. From the foregoing description, one skilled in the art can readily ascertain its essence and can make various modifications for various applications and conditions without departing from the spirit and scope of the invention. Industrial Applicability As will be apparent from the specification and examples, the present invention is useful for the industrial production of optical grade glass compositions for ophthalmic lenses, particularly lightweight bifocal lenses.

Claims (1)

【特許請求の範囲】 １ 重量パーセントで実質的に下記の組成よりな
る近視および遠視用眼鏡に好適な1.79〜1.82の屈
折率、少なくとも32のアツベ数および4.0ｇ／cm3
以下の密度を有する高屈折率眼鏡用ガラス。 SiO2 7.5〜13.5 B2O3 13 〜19 Al2O3 0 〜 4 SiO2＋B2O3＋Al2O3＝ 24 〜30 Li2O 0 〜 3 Na2O 0 〜 4 K2O 0 〜 4 Li2O＋Na2O＋K2O＝ 2 〜 6 CaO 4 〜18 MgO 0 〜 6 SrO 0 〜14 BaO 0 〜14 PbO 0 〜15 ZnO 0 〜 7 CaO＋MgO＋SrO＋BaO＋PbO＋ZnO＝
9 〜26 La2O3 13 〜30 Y2O3 0 〜 6 Gd2O3 0 〜 6 La2O3＋Y2O3＋Gd2O3＝ 17 〜31 ZrO2 3 〜 8 TiO2 5 〜13 Nb2O5 5 〜12 WO3 0 〜 6 TiO2＋Nb2O5＋WO3＝ 15 〜22 Ta2O5 0 〜 6 ２ 下記の組成（重量％）を有してなる特許請求
の範囲第１項に記載のガラス。 SiO2 10 〜13 B2O3 14 〜18 SiO2＋B2O3＝ 26 〜29 Li2O 0 〜 2 Na2O 0 〜 3 K2O 0 〜 4 Li2O＋Na2O＋K2O＝ 2 〜 6 CaO 8.5〜13 MgO 0 〜 4 SrO 0 〜 8 BaO 0 〜 8 PbO 0 〜 8 ZnO 0 〜 6 CaO＋MgO＋SrO＋BaO＋PbO＋ZnO＝
11 〜18 La2O3 20 〜30 Y2O3 0 〜 5 Gd2O3 0 〜 5 La2O3＋Y2O3＋Gd2O3＝ 25 〜30 ZrO2 4 〜 8 TiO2 7 〜11 Nb2O5 7 〜11 WO3 0 〜 4 TiO2＋Nb2O5＋WO3＝ 16 〜20 Ta2O5 0 〜 5 ３ 下記の組成（重量％）よりなる少なくとも34
のアツベ数および3.85以下の密度を有する特許請
求の範囲第１項に記載のガラス。 SiO2 11.5〜13.5 B2O3 15.0〜18 SiO2＋B2O3＝ 27.5〜29.5 Li2O 0.5〜 2.0 Na2O 0 〜 3 K2O 0 〜 3 CaO 9 〜12 ZnO 0 〜 4 SrO 0 〜 4 BaO 0 〜 4 PbO 0 〜 4 MgO 0 〜 4 CaO＋ZnO＋SrO＋BaO＋PbO＋MgO＝
12 〜15 La2O3 23 〜29 Y2O3 0 〜 4 La2O3＋Y2O3＝ 27 〜30 ZrO2 6 〜 8 TiO2 8.5〜11 Nb2O5 7.0〜10.5 TiO2＋Nb2O5＝ 16.5〜19 Claims: 1. A refractive index of 1.79 to 1.82 suitable for myopia and hyperopia glasses consisting essentially of the following composition in weight percent: an Atsube number of at least 32 and 4.0 g/cm 3
A high refractive index glass for spectacles having a density of: SiO 2 7.5 ~ 13.5 B 2 O 3 13 ~ 19 Al 2 O 3 0 ~ 4 SiO 2 + B 2 O 3 + Al 2 O 3 = 24 ~ 30 Li 2 O 0 ~ 3 Na 2 O 0 ~ 4 K 2 O 0 ~ 4 Li 2 O + Na 2 O + K 2 O = 2 ~ 6 CaO 4 ~ 18 MgO 0 ~ 6 SrO 0 ~ 14 BaO 0 ~ 14 PbO 0 ~ 15 ZnO 0 ~ 7 CaO + MgO + SrO + BaO + PbO + ZnO =
9 ~ 26 La 2 O 3 13 ~ 30 Y 2 O 3 0 ~ 6 Gd 2 O 3 0 ~ 6 La 2 O 3 + Y 2 O 3 + Gd 2 O 3 = 17 ~ 31 ZrO 2 3 ~ 8 TiO 2 5 ~ 13 Nb 2 O 5 5 - 12 WO 3 0 - 6 TiO 2 + Nb 2 O 5 + WO 3 = 15 - 22 Ta 2 O 5 0 - 6 2 Claim 1 having the following composition (wt%) Glass as described in Section. SiO 2 10 ~ 13 B 2 O 3 14 ~ 18 SiO 2 +B 2 O 3 = 26 ~ 29 Li 2 O 0 ~ 2 Na 2 O 0 ~ 3 K 2 O 0 ~ 4 Li 2 O + Na 2 O + K 2 O = 2 ~ 6 CaO 8.5〜13 MgO 0〜4 SrO 0〜8 BaO 0〜8 PbO 0〜8 ZnO 0〜6 CaO＋MgO＋SrO＋BaO＋PbO＋ZnO＝
11 ~18 La 2 O 3 20 ~ 30 Y 2 O 3 0 ~ 5 Gd 2 O 3 0 ~ 5 La 2 O 3 + Y 2 O 3 + Gd 2 O 3 = 25 ~ 30 ZrO 2 4 ~ 8 TiO 2 7 ~ 11 Nb 2 O 5 7 - 11 WO 3 0 - 4 TiO 2 + Nb 2 O 5 + WO 3 = 16 - 20 Ta 2 O 5 0 - 5 3 At least 34 consisting of the following composition (wt%)
The glass according to claim 1, having an Atsube number of 3.85 or less and a density of 3.85 or less. SiO 2 11.5 ~ 13.5 B 2 O 3 15.0 ~ 18 SiO 2 +B 2 O 3 = 27.5 ~ 29.5 Li 2 O 0.5 ~ 2.0 Na 2 O 0 ~ 3 K 2 O 0 ~ 3 CaO 9 ~ 12 ZnO 0 ~ 4 SrO 0 〜4 BaO 0〜4 PbO 0〜4 MgO 0〜4 CaO＋ZnO＋SrO＋BaO＋PbO＋MgO＝
12 ~15 La 2 O 3 23 ~ 29 Y 2 O 3 0 ~ 4 La 2 O 3 +Y 2 O 3 = 27 ~ 30 ZrO 2 6 ~ 8 TiO 2 8.5 ~ 11 Nb 2 O 5 7.0 ~ 10.5 TiO 2 +Nb 2 O5 =16.5~19
JP539583A 1982-01-18 1983-01-18 High-refractive index optical glass having refractive index of 1.79-1.82, abbe number of at least 32 and density of 4.0g/cm3 or less Granted JPS58125637A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3201344.2 1982-01-18
DE19823201344 DE3201344C2 (en) 1982-01-18 1982-01-18 High refractive index optical glasses in the system SiO 2 -B 2 O 3 -Alkalioxid-Erdalkaloxid-La 2 O 3 -ZrO 2 -TiO 5 2-2 -Nb with refractive indices of 1.79 - 1.82, Abbezahlen? 32 and densities ≦ 4.0

Publications (2)

Publication Number Publication Date
JPS58125637A JPS58125637A (en) 1983-07-26
JPS6332734B2 true JPS6332734B2 (en) 1988-07-01

Family

ID=6153303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP539583A Granted JPS58125637A (en) 1982-01-18 1983-01-18 High-refractive index optical glass having refractive index of 1.79-1.82, abbe number of at least 32 and density of 4.0g/cm3 or less

Country Status (2)

Country Link
JP (1) JPS58125637A (en)
DE (1) DE3201344C2 (en)

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JPS6021828A (en) * 1983-07-14 1985-02-04 Hoya Corp Glass for spectacle lens
JPS60122745A (en) * 1983-12-07 1985-07-01 Hoya Corp Optical glass
BR8605356A (en) * 1985-11-29 1987-08-04 Corning Glass Works GLASS FOR OPTICAL AND / OR OPHTHALMIC APPLICATIONS
DE4222322C1 (en) * 1992-07-08 1993-12-02 Schott Glaswerke Optical glass - with high negative part dispersion in blue spectrum range as well as high refraction index and abbe number
EP0971861B1 (en) * 1997-01-29 2004-04-07 Corning S.A. Glasses with very high refractive index
FR2758814B1 (en) * 1997-01-29 1999-04-23 Corning Sa VERY HIGH REFRACTIVE INDEX GLASSES
US6121176A (en) * 1997-01-29 2000-09-19 Corning S.A. Glasses with very high refractive index
DE19848077C1 (en) * 1998-10-19 2000-01-27 Schott Glas Lead-free optical glass
DE19920865C1 (en) 1999-05-06 2000-06-29 Schott Glas Lead-free optical borosilicate glass, for optical equipment and optical data applications, contains barium, zinc, titanium, niobium and rare earth oxides and has a high refractive index and a low Abbe number
JP4350016B2 (en) * 2004-09-29 2009-10-21 Ｈｏｙａ株式会社 Optical glass, precision press-molding preform and manufacturing method thereof, and optical element and manufacturing method thereof
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JP6146691B2 (en) * 2012-03-27 2017-06-14 日本電気硝子株式会社 Optical glass
US20190233323A1 (en) * 2016-10-03 2019-08-01 Ohara Inc. Optical glass, preform, and optical element
JP7224099B2 (en) * 2016-10-03 2023-02-17 株式会社オハラ Optical glass, preforms and optical elements
CN109650717B (en) * 2019-02-28 2021-10-26 成都光明光电股份有限公司 Optical glass
US11802073B2 (en) 2020-09-10 2023-10-31 Corning Incorporated Silicoborate and borosilicate glasses with high refractive index and low density
US11976004B2 (en) 2020-09-10 2024-05-07 Corning Incorporated Silicoborate and borosilicate glasses having high refractive index and high transmittance to blue light
US11999651B2 (en) 2020-09-10 2024-06-04 Corning Incorporated Silicoborate and borosilicate glasses having high refractive index and low density
CN114315131A (en) * 2021-12-31 2022-04-12 海安明光光学玻璃科技有限公司 Optical glass
JP2023102688A (en) * 2022-01-12 2023-07-25 株式会社住田光学ガラス Optical glass, preform for precision press molding, and optical element
CN115304270A (en) * 2022-08-26 2022-11-08 成都光明光电股份有限公司 Optical glass, optical element and optical instrument

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4888106A (en) * 1972-02-25 1973-11-19
JPS52103412A (en) * 1976-02-26 1977-08-30 Obara Optical Glass Optical glass

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4888106A (en) * 1972-02-25 1973-11-19
JPS52103412A (en) * 1976-02-26 1977-08-30 Obara Optical Glass Optical glass

Also Published As

Publication number Publication date
DE3201344A1 (en) 1983-07-28
DE3201344C2 (en) 1984-02-16
JPS58125637A (en) 1983-07-26

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