DE2057706A1 - Optical glass which is stable against devitrification and has a high refractive index of around 1,900 and a relatively low dispersion of around 40 on the basis of lanthanum-tantel oxide - Google Patents

Optical glass which is stable against devitrification and has a high refractive index of around 1,900 and a relatively low dispersion of around 40 on the basis of lanthanum-tantel oxide

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Publication number
DE2057706A1
DE2057706A1 DE19702057706 DE2057706A DE2057706A1 DE 2057706 A1 DE2057706 A1 DE 2057706A1 DE 19702057706 DE19702057706 DE 19702057706 DE 2057706 A DE2057706 A DE 2057706A DE 2057706 A1 DE2057706 A1 DE 2057706A1
Authority
DE
Germany
Prior art keywords
oxide
around
lanthanum
refractive index
relatively low
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.)
Pending
Application number
DE19702057706
Other languages
German (de)
Inventor
auf Nichtnennung M Antrag
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers 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 Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Publication of DE2057706A1 publication Critical patent/DE2057706A1/en
Pending 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
    • C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths

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  • 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

PutefttanvvcltPutefttanvvclt

Dto!.-lna.K.W&itherDto! .- lna.K.W & ither

ι BERLIN 19 17«Hovember 1970ι BERLIN 19 17 November 1970

BolivartoS / W-W-2700BolivartoS / W-W-2700

TfekS0442G5TfekS0442G5

Pilkington Brothers limited, 201-211 Martins Bank Building, Waterstreat, Liverppol 2, Lancashire/EnglandPilkington Brothers limited, 201-211 Martins Bank Building, Waterstreat, Liverppol 2, Lancashire / England

Gegen Entglasung stabiles optisches Glas mit hoher Brechungszahl yon etwa 1,900 und relatir geringer Dispersion τοη etwa 40 auf der Basis τοη Lanthan-TantaloxidOptical glass which is stable to devitrification and has a high refractive index of about 1.900 and a relatively low dispersion τοη about 40 based on lanthanum tantalum oxide

Die Erfindung bezieht sich auf ein gegen Entglasung stabiles optisches Glas mit hoher Breohnungssahl τοη etwa 1,900 und relatiT geringer Dispersion τοη etwa 40 auf der Basis τοη lanthan-Tantaloxid.The invention relates to an optical glass which is stable against devitrification and has a high Breohnungssahl τοη for example 1,900 and relatively low dispersion τοη about 40 on the Based on τοη lanthanum tantalum oxide.

Es sind optische Gläser bekannt, bei denen Bleioxid durch andere Metalloxide ersetzt ist und die Bleigläsern entsprechende gute optische Eigenschaften mit verbesserten physikalischen Eigenschaften aufweisen« Derartige Gläser enthalten beispielsweise Lanthamoxid.Optical glasses are known in which lead oxide is replaced by other metal oxides and the lead glasses have correspondingly good optical properties with improved physical properties. Such glasses contain for example lantham oxide.

Durch die CH-PS 285 073 ist ein thoriumfreies Glae mit einem hohen Lanthanoyidanteil bekannt, das eine Brechungs*« *ahl τοη 1,851 aufweist. Der hohe lanthanoxidgehalt zeitigt jedoch eine hohe Meigung zum Entglasen, die unerwünscht ist*Through the CH-PS 285 073 is a thorium-free glass known with a high proportion of lanthanide, which has a refraction * « * ahl τοη 1.851. The high lanthanum oxide content causes however, a high tendency towards deglassing, which is undesirable *

Bekannt 1st auch ein Glae mit gleichen Anteilen an Tantaloxid und Titanoxid, das ebenfalls eine hohe Breohungs- lahl aufweist, jedoch nur eine geringe Abbesche Zahl τοη 19,1 hat.1st known a GLAE with equal proportions in tantalum oxide and titanium oxide, which also has a high Breohungs- Lahl, but only a small Abbe number has τοη 19.1.

109824/1713109824/1713

2Π577062Π57706

•Ml 2 *"*• Ml 2 * "*

Durch die DT-PS 1 188 248 sind ferner Gläser mit einem hohen Boroxidgehalt bekannt, die eine nur geringe Beigung zum Entglasen haben· Innerhalb dieser Gr*ppe gibt es Gläser mit einer hohen Breehungszahl τοη 1,890 bzw· 1,930 aber sehr hoher Dispersion τοη etwa 29» und Gläser mit geringer Diaper« aion von 39» die wiederum eine geringe Brechnungszahl von 1,830 aufweisen«.Through the DT-PS 1 188 248 glasses with a high boron oxide content are also known, which have only a slight shade for devitrification · Within this group there are glasses with a high number of refinements τοη 1.890 or 1.930 but very high dispersion τοη about 29 "and glasses with low diaper" aion of 39 »which in turn has a low refractive index of 1,830 have «.

Zur Erzielung eines gegen Entglasung stabilen optischen Glases, das eine hohe Breehungszahl von etwa 1,900 mit einer relativ geringen Dispersion von etwa 40 vereinigt, also optimale Eigenschaften aufweist, und auf der Basis von Lanthan— Tantaloxid aufgebaut ist, ist ferner eine Zusammensetzung vorgeschlagen worden aus 50 bis 55 Gew£ Lanthanoxid, 15 bis 20 Sew£ Tantaloxid, 6 bis 9 Gew£ Siliziumdioxid, 7,5 bis 9,5 Gewji Boroxid, 6,5 bis 8 Gew# Zirkonoxid, 0,1 bis 5 Gew# Germaniumoxid und 0 bis 1 Gew# Calciumoxid.To achieve an optical glass which is stable against devitrification and which has a high number of dimensions of around 1,900 combined with a relatively low dispersion of about 40, i.e. it has optimal properties, and is based on lanthanum. Tantalum oxide is built up, a composition has also been proposed from 50 to 55 wt £ lanthanum oxide, 15 to 20 Sew £ tantalum oxide, 6 to 9% by weight silicon dioxide, 7.5 to 9.5% by weight Boron oxide, 6.5 to 8 wt # zirconia, 0.1 to 5 wt # germanium oxide and 0 to 1 wt # calcium oxide.

Durch die Erfindung wird ein opti^shes Glas dieser Eigenschaften durch folgende Zusammensetzung in Gewichtsprozenten erzielt} Through the e r ^ shes invention, a optical glass of these properties is achieved by the following composition in percentages by weight}

10 bie 50 # Lanthanoxid (La2O5) , 15 bis 20 # Tantaloxid (Ta2O5) , 6 bis 9 $> Siliziumdioxid (SiO2), 7*5 bis 9,5 % Boroxid (B2O5) , 1 bis 5 % Germaniumoxid (GeO2) , 6,5 bis 8 # Zirkonoxid (ZrO2) und 1 bis 20 % Gadoliniumoxid (Gd2O5).10 to 50 # lanthanum oxide (La 2 O 5 ), 15 to 20 # tantalum oxide (Ta 2 O 5 ), 6 to 9 $> silicon dioxide (SiO 2 ), 7 * 5 to 9.5% boron oxide (B 2 O 5 ) , 1 to 5 % germanium oxide (GeO 2 ), 6.5 to 8 # zirconium oxide (ZrO 2 ) and 1 to 20 % gadolinium oxide (Gd 2 O 5 ).

Bach einem weiteren Merkmal der Erfindung kann in der Zusammensetzung bis «u 5 Gew# Ittriumoxid (Y20,) auf das Gesamtgewicht bezogen enthalten sein0 Bach a further feature of the invention E r can be in the composition to "u # 5 wt Ittriumoxid (Y 2 0) contain, based on the total weight be 0

Gläser dieser Zusammensetzung haben eine grosseGlasses of this composition have a large size

10 9 8 2 4/1713 w>.10 9 8 2 4/1713 w> .

Abbe'sclie Zahl unter nur geringer Verringerung der Brechungszahl, die im Bereich des Wertes Ton 1,900 verbleibt. Abbe's number with only a slight decrease in the refractive index, which remains in the range of the Ton 1.900 value.

Nachstehend sind einige bevorzugte Zusammensetzungen nach der Erfindung angeführt:Some preferred compositions according to the invention are listed below:

BestandeteilConstituent part

SiO2
B2O3 SiO 2
B 2 O 3

Beisp.1
i.Gew^Example 1
i.Gew ^ Beisp.2
i.Gew?tExample 2
i.We? t BeJ)sp«3
i.Gew%BeJ) sp «3
in weight% 6,996.99 6,996.99 6,996.99 9,119.11 9,119.11 9,119.11 3,063.06 3,063.06 3,063.06 18,7818.78 18,7818.78 18,7818.78 49,8249.82 40,8240.82 30,8230.82 7,187.18 7,187.18 7,197.19 1,001.00 iotooio t oo 20,0020.00 4,064.06 4,064.06 4,064.06 1,895801.89580 1,895731,89573 1,8948271.894827 40,5940.59 40,6240.62 40,6340.63

Der Ersatz eines Teils des Lanthanoxide durch Gadoliniumoxid verringert die Neigung zum Entglasen,ebne das Erreichen einer hohen Abbeschen Zahl zu gefährden, wobei eine nur geringe Verringerung der Brechnungszahl eintritt, wie dies die vorstehenden ^erte erkennen lassen·Replacing some of the lanthanum oxide with gadolinium oxide reduces the tendency to devitrify, p endanger the achievement of a high Abbe number, whereby there is only a slight decrease in the refractive index, as can be seen from the above

Die Gläser nach der Erfindung können in der für optische Gläser üblichen Weise gebildet werden, wobei eine sorgftltige Steuerung des Glühvorgange wichtig ist·The glasses according to the invention can be formed in the manner customary for optical glasses, with a careful control of the annealing process is important

10 9 8 2 A/1713 A 10 9 8 2 A / 1713 A

Claims (1)

Patentansprtiche :Patent claims: 1«, Gegen Entglasung stabiles optiech.es Glae mit hoher Brechungszahl von etwa 1,900 und relativ geringer Dispersion von etwa 40 auf der Basis von Lanthan-Tantaloxid, dadurch gekennzeichnet, dass es folgende Zusammensetzung in Gewichtsprozenten hat:1 «, Optiech.es Glae stable against devitrification with high refractive index of around 1,900 and relatively low dispersion of about 40 based on lanthanum tantalum oxide, characterized in that there are the following Composition in percent by weight has: 10 bis 50 # Lanthanoxid (La2O-) , -10 to 50 # lanthanum oxide (La 2 O-), - 15 bis 20 % Tantaloxid (Ta2O5) , -15 to 20 % tantalum oxide (Ta 2 O 5 ), - 6 bis 9 # Siliziumdioxid (SiO2), ~6 to 9 # silicon dioxide (SiO 2 ), ~ 7,5 - 9,5 # Boroxid (B2O3) , 1 bis 5 % Germaniumoxid (Geg), 6,5 - 8 $ Zirkonoxid (ZrO2) , 1 bis 20 Ji Gadoliniumoxid7.5 - 9.5 # boron oxide (B 2 O 3 ), 1 to 5 % germanium oxide (Geg), 6.5 - 8 $ zirconium oxide (ZrO 2 ), 1 to 20 Ji gadolinium oxide 2„ Glaszusammensetzung nach Anspruch 1, dadurch gekennzeichnet, dass sie bis zu 5 Gew£ Yttriumoxid (Y2O,) auf das Gesamtgewicht bezogen enthälto 2 “Glass composition according to claim 1, characterized in that it contains up to 5% by weight of yttrium oxide (Y 2 O,) based on the total weight o 1 0 9 i 2 . / 1 7 1 21 0 9 i 2 . / 1 7 1 2
DE19702057706 1969-12-09 1970-11-17 Optical glass which is stable against devitrification and has a high refractive index of around 1,900 and a relatively low dispersion of around 40 on the basis of lanthanum-tantel oxide Pending DE2057706A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6011669A GB1299879A (en) 1969-12-09 1969-12-09 Improvements in or relating to glass compositions

Publications (1)

Publication Number Publication Date
DE2057706A1 true DE2057706A1 (en) 1971-06-09

Family

ID=10485038

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702057706 Pending DE2057706A1 (en) 1969-12-09 1970-11-17 Optical glass which is stable against devitrification and has a high refractive index of around 1,900 and a relatively low dispersion of around 40 on the basis of lanthanum-tantel oxide

Country Status (3)

Country Link
DE (1) DE2057706A1 (en)
FR (1) FR2072820A5 (en)
GB (1) GB1299879A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214607A (en) * 1975-07-24 1977-02-03 Obara Optical Glass Optical glass not containing thorium
JPS5263920A (en) * 1975-11-25 1977-05-26 Nippon Chemical Ind Optical glass
JP3750984B2 (en) * 2000-05-31 2006-03-01 Ｈｏｙａ株式会社 Optical glass and optical product manufacturing method

Also Published As

Publication number Publication date
GB1299879A (en) 1972-12-13
FR2072820A5 (en) 1971-09-24

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