DE3201344C2 - 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 - Google Patents

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

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Publication number
DE3201344C2
DE3201344C2 DE19823201344 DE3201344A DE3201344C2 DE 3201344 C2 DE3201344 C2 DE 3201344C2 DE 19823201344 DE19823201344 DE 19823201344 DE 3201344 A DE3201344 A DE 3201344A DE 3201344 C2 DE3201344 C2 DE 3201344C2
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tio
zro
sio
refractive index
densities
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DE19823201344
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DE3201344A1 (en
Inventor
Volkmar 6500 Mainz Geiler
Georg Dipl.-Ing. Dr. Gliemeroth
Karl Dr. 6204 Taunusstein Mennemann
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Schott AG
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Schott Glaswerke AG
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Priority to DE19823201344 priority Critical patent/DE3201344C2/en
Priority to JP539583A priority patent/JPS58125637A/en
Publication of DE3201344A1 publication Critical patent/DE3201344A1/en
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    • 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

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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)
  • Eyeglasses (AREA)

Abstract

Die hochbrechenden optischen Gläser haben Brechwerte von 1,79-1,82, Abbezahlen 32 und Dichten 4,0 und sind sowohl für Brillennahteile als auch für Fernteile geeignet. Sie haben folgnde Zusammensetzung in Gew.%: SiO ↓2 7,5-13,5; B ↓2O ↓3 13-19; Al ↓2O ↓3 0-4; Li ↓2O 0-3; Na ↓2O 0-4; K ↓2O 0-4; CaO 4-18; MgO 0-6; SrO 0-14; BaO 0-14; PbO 0-15; ZnO 0-7; La ↓2O ↓3 13-30; Y ↓2O ↓3 0-6; Gd ↓2O ↓3 0-6; ZrO ↓2 3-8; TiO ↓2 5-13; Nb ↓2O ↓5 5-12; WO ↓3 0-6; Ta ↓2O ↓5 0-6.The high-index optical glasses have refractive indices of 1.79-1.82, Abbe Numbers 32 and densities 4.0 and are suitable for both near and distant parts. They have the following composition in% by weight: SiO ↓ 2 7.5-13.5; B ↓ 2O ↓ 3 13-19; Al ↓ 2O ↓ 3 0-4; Li ↓ 2O 0-3; Na ↓ 2O 0-4; K ↓ 2O 0-4; CaO 4-18; MgO 0-6; SrO 0-14; BaO 0-14; PbO 0-15; ZnO 0-7; La ↓ 2O ↓ 3 13-30; Y ↓ 2O ↓ 3 0-6; Gd ↓ 2O ↓ 3 0-6; ZrO ↓ 2 3-8; TiO ↓ 2 5-13; Nb ↓ 2O ↓ 5 5-12; WO ↓ 3 0-6; Ta ↓ 2O ↓ 5 0-6.

Description

SiO2 SiO 2 73-13373-133 B2O3 B 2 O 3 13-1913-19 Al2O3 Al 2 O 3 0-40-4 SiO:. + B2O3+Al2O3 SiO :. + B 2 O 3 + Al 2 O 3 24-3024-30 U2OU 2 O 0-30-3 Na2ONa 2 O 0-40-4 K2OK 2 O 0-40-4 Li^O + Na2O +K2OLi ^ O + Na 2 O + K 2 O 2-62-6 CaOCaO 4-184-18 MgOMgO 0-60-6 SrOSrO 0-140-14 BaOBaO 0-140-14 PbOPbO 0-150-15 ZnOZnO 0-70-7 CaO + MgO + SrO + BaOCaO + MgO + SrO + BaO + PbO+ ZnO+ PbO + ZnO 9-269-26 La2O3 La 2 O 3 13-3013-30 Y2O3 Y 2 O 3 0-60-6 Gd2O3 Gd 2 O 3 0-60-6 U2O3+ Y2O3+Gd2O3 U 2 O 3 + Y 2 O 3 + Gd 2 O 3 17-3117-31 ZrO2 ZrO 2 3-83-8 TiO2 TiO 2 5-135-13 Nb2O5 Nb 2 O 5 5-125-12 WO3 WHERE 3 0-60-6 TiO2+Nb2O5+ WO3 TiO 2 + Nb 2 O 5 + WO 3 15-2215-22 Ta2O5 Ta 2 O 5 0-60-6 Gläser nach Anspruch 1,
h folgende Zusammensetzung:Glasses according to claim 1,
h following composition: gekennzeichnetmarked SiO2 SiO 2 10-1310-13 B2O3 B 2 O 3 14-1814-18 SiO2+B2O3 SiO 2 + B 2 O 3 26-2926-29 Li2OLi 2 O 0-20-2 Na2ONa 2 O 0-30-3 K2OK 2 O 0-30-3 Li2O+ Na2O+ K2OLi 2 O + Na 2 O + K 2 O 2-62-6 CaOCaO 83-1383-13 MgOMgO 0-40-4 SrOSrO 0-80-8 BaOBaO 0-80-8 PbOPbO 0-80-8 ZnOZnO 0-60-6 CaO + MgO + SrO + BaOCaO + MgO + SrO + BaO + PbO+ ZnO+ PbO + ZnO 11-1811-18 La2O3 La 2 O 3 20-3020-30 Y2O3 Y 2 O 3 0-50-5 Gd2O3 Gd 2 O 3 0-50-5 La2O3+ Y2O3+ Gd2O3 La 2 O 3 + Y 2 O 3 + Gd 2 O 3 25-3025-30 ZrO2 ZrO 2 4-84-8 TiO2 TiO 2 7-117-11 Nb2O5 Nb 2 O 5 7-117-11 WO3 WHERE 3 0-40-4 TiO2+ Nb2O5+ WO3 TiO 2 + Nb 2 O 5 + WO 3 16-2016-20 Ta2O5 Ta 2 O 5 0-50-5

SiO2 SiO 2 113-133113-133 B2O3 B 2 O 3 15,0—1815.0-18 SiO2+B2O3 SiO 2 + B 2 O 3 273-293273-293 U2OU 2 O 03-2,003-2.0 Na2ONa 2 O 0-30-3 K2OK 2 O 0-30-3 Li Λ + Na2O+K2OLi Λ + Na 2 O + K 2 O 2-62-6 CaOCaO 9-129-12 ZnOZnO 0-40-4 SrOSrO 0-40-4 BaOBaO 0-40-4 PbOPbO 0-40-4 MgOMgO 0-40-4 CaO + ZnO + SrO + BaOCaO + ZnO + SrO + BaO + PbO + MgO+ PbO + MgO 12—1512-15 La2O3 La 2 O 3 23-2923-29 Y2O3 Y 2 O 3 0-40-4 La2O3+Y2O3 La 2 O 3 + Y 2 O 3 27-3027-30 ZrO2 ZrO 2 6-86-8 TiO2 TiO 2 83-1183-11 Nb2O5 Nb 2 O 5 7,0-1037.0-103 TiO2+Nb2O5 TiO 2 + Nb 2 O 5 163-19163-19

Es ist bereits eine Reihe von hochbrechenden leichten Brillengläsern mit nd= 1,70 bekannt, z. B. aus der DE-PS 22 59 183. Für starke Fehlsichtigkeiten bedingen aber auch diese Gläser noch relativ große Mittendicken (für Plusgläser) bzw. Randdicken (für Minusgläser). Das Ziel der vorliegenden Erfindung ist es, ein noch höher brechendes leichtes Fernteilglas mit einem Brechungsindex > 1,79 zu ermöglichen, wobei gleichzeitig ein möglichst hoher Abbewert angestrebt wird; gleichzeitig sollen diese Gläser als Nahteile zu den leichten hochbrechenden Gläsern gemäß DE-OS 30 26 605 und DE-OS 31 21 824 zu verwenden sein.A number of high-refractive, lightweight spectacle lenses with nd = 1.70 are already known, e.g. B. from DE-PS 22 59 183. For severe ametropia, however, these glasses also require relatively large center thicknesses (for plus lenses) or edge thicknesses (for minus lenses). The aim of the present invention is to enable an even higher refractive light binoculars with a refractive index> 1.79, while at the same time aiming for as high a value as possible; At the same time, these glasses should be used as close-up parts to the light high-index glasses according to DE-OS 30 26 605 and DE-OS 31 21 824.

Brillengläser mit geringer Dichte und Brechwerten von 1,80 werden z. B. beschrieben in DE-AS 28 24 891 und DE-AS 28 24 982. Die in DE-AS 28 24 982 beschriebenen Gläser haben den Nachteil einer sehr geringen Abbe/ahl von 29—31; doch leider benötigen gerade die stark Fehlsichtigen Gläser mit hoher Abbezahl, da die störenden Farbsäume mit. höheren Dioptriewerten zunehmen: diese Farbsäume können hjr durch höhere Abbezahlen gemindert werden. Diese Aufgabe erfüllen die erfindungsgemäßen Gläser.Eyeglass lenses with a low density and refractive index of 1.80 are z. B. described in DE-AS 28 24 891 and DE-AS 28 24 982. The glasses described in DE-AS 28 24 982 have the disadvantage of being very low Abbreviation from 29-31; but unfortunately just need them severely ametropic glasses with a high Abbe number, as the annoying color fringes with. increase in higher diopter values: these color fringes can be caused by higher Pay off will be reduced. The glasses according to the invention fulfill this task.

Die in DE-Aa 28 24 891 beschriebenen Gläser erfüllen nicht die zu stellenden Anforderungen hinsichtlich Kristallisationsstabilität, da sie sehr hohe TiO2-Anteile haben; diese hohen TiO2-Anteile haben zudem einen nachteiligen Effekt auf die Lichtdurchlässigkeit; weiterhin sind diese Gläser wegen ihres ungünstigen Viskositätsverlaufs nicht geeignet als Nahteile für Gläser, wie sie in DE-OS 30 26 605 und DE-OS 31 21 824 beschrieben sind.The glasses described in DE-Aa 28 24 891 do not meet the requirements with regard to crystallization stability, since they have very high TiO 2 proportions; these high TiO 2 proportions also have a disadvantageous effect on the light transmission; Furthermore, because of their unfavorable viscosity profile, these glasses are not suitable as near-end parts for glasses, as described in DE-OS 30 26 605 and DE-OS 31 21 824.

Die erfindungsgemäße Aufgabe — Brillenfernteilglas und -nahteilglas mit einem Brechungsindex 1,79—1,82 bei gleichzeitig geringer Dichte (<4,0 g/cm3) und mögliehst hoher Abbezahl (2:32) — wird gelöst durch Gläser des Systems SiO2-B2O3-CaO-La2O3-ZrO2-TiO2-Nb2O5-Alkalioxid mit folgender Zusammensetzung (in Gewichtsprozent):The object according to the invention - binoculars and near vision glasses with a refractive index 1.79-1.82 with a low density (<4.0 g / cm 3 ) and the highest possible Abbe number (2:32) - is achieved by glasses of the SiO 2 system -B 2 O 3 -CaO-La 2 O 3 -ZrO 2 -TiO 2 -Nb 2 O 5 -Alkalioxid with the following composition (in percent by weight):

SiO2 7,5-133SiO 2 7.5-133

B2O3 13-19B 2 O 3 13-19

AI2O3 0-4AI 2 O 3 0-4

SiO2 + B2O3+Al2O3 24-30SiO 2 + B 2 O 3 + Al 2 O 3 24-30

Li2O 0-3Li 2 O 0-3

Na2O 0-4Na 2 O 0-4

K2O 0-4K 2 O 0-4

U2O+ Na2O+ K2O 2-6U 2 O + Na 2 O + K 2 O 2-6

CaO 4-18CaO 4-18

MgO 0-6MgO 0-6

SrO 0-14SrO 0-14

BaO 0-14BaO 0-14

PbO 0-15PbO 0-15

ZnO 0-7 CaO + MgO + SrO + BaOZnO 0-7 CaO + MgO + SrO + BaO

+ PbO + ZnO 9-26+ PbO + ZnO 9-26

U2O3 13-30U 2 O 3 13-30

Y2O3 0-6Y 2 O 3 0-6

Gd2O3 0-6Gd 2 O 3 0-6

La2O3 + Y2Ga+Gd2O3 17-31La 2 O 3 + Y 2 Ga + Gd 2 O 3 17-31

ZrO2 3-8ZrO 2 3-8

TiO2 5-13TiO 2 5-13

Nb2O5 5-12Nb 2 O 5 5-12

WO3 0-6WO 3 0-6

TiO2+ Nb2O5+ WO3 15-22TiO 2 + Nb 2 O 5 + WO 3 15-22

Ta2O5 0-6Ta 2 O 5 0-6

Der Anteil der Glasbildner SiO2+B:O, +AI2O3 beträgt 24—30 Gew.-%; Alkalioxid in Anteilen von 2—6 Gew.-% ist notwendig, um ein leichtes Aufschmelzen des Gemenges zu gewährleisten und auch, um einen Ausdehnungskoeffizienten 20—300 von 80—98 χ 10~7 sicherzustellen, der notwendig ist, damit das Glas als Nahteilglas verwendet werden kann.The proportion of the glass formers SiO 2 + B : O, + Al 2 O 3 is 24-30% by weight; Alkali oxide in amounts of 2-6 wt .-% is required to a slight melting of the batch to ensure and also to a coefficient of expansion of 20-300 80-98 χ 10 ~ 7 ensure that is necessary for the glass as Nahteilglas can be used.

CaO in Anteilen von 4—18 Gew.-°/o hebt den Brechwert beachtlich und sorgt für eine geringe Dichte. Die Summe der zweiwertigen Oxide (MgO, CaO, SrO, ZnO, PbO) beträgt 9-26 Gew.-°/o.CaO in proportions of 4-18% by weight increases the refractive index considerable and ensures a low density. The sum of the divalent oxides (MgO, CaO, SrO, ZnO, PbO) is 9-26% by weight.

Ohne einen Seltenerdzusatz (La2O3 +Y2O3+Gd2O3) von 17—31 Gew.-% ist der geforderte hohe BrechwertWithout a rare earth additive (La 2 O 3 + Y 2 O 3 + Gd 2 O 3 ) of 17-31% by weight, the required high refractive index is

ίο nicht zu erreichen. Zur Brechwerterhöhung, wobei gleichzeitig die Abbezahl nicht erniedrigt wird, dient auch ZrO2 in Anteilen von 3—8 Gew.-%. Als sehr starke brechwerterhöhende Komponenten — wobei sie die Dichte des Glases nur rela:iv wenig erhöhen — werden T /O2, Nb2O5 und WO3 in den angegebenen Mengen benutzt Hierbei ist insbesondere von Bedeutung, daß der TiO2-Anteü 13 Gew.-% nicht übersteigen soll, da die Kristallisationsanfälligkeit stark zunimmt
In der nachfolgenden Tabelle sind beispielhafte Zusammensetzungen gemäß der Erfindung zusammengestellt (Angaben in Gew.-%).ίο not to be reached. To increase the refractive index, while at the same time not lowering the Abbe number, ZrO 2 is also used in proportions of 3-8% by weight. As very strong brechwerterhöhende components - being only rela the density of the glass: iv little increase - be T / O 2, Nb 2 O 5 and WO 3 in the stated amounts used particularly, it is important that the TiO 2 -Anteü 13 Weight% should not exceed, since the susceptibility to crystallization increases sharply
Exemplary compositions according to the invention are compiled in the table below (data in% by weight).

Gläser gemäß dieser Erfindung werden folgendermaßen hergestellt: Die Komponenten — Oxide, Carbonate, Nitrate — werden entsprechend der Vorschrift abgewogen; es wird ein Läutermittel zugesetzt, und das Glasgemenge wird gut gemischtGlasses according to this invention are produced as follows: The components - oxides, carbonates, Nitrates - are weighed according to the prescription; a refining agent is added, and that Glass batch is mixed well

Zwischen 1250° um1. 1300° wird das Gemenge im Pt-Tiegel oder einer keramischen Wanne aufgeschmolzen, geläutert, gut mittels Rührer homogenisiert und bei 950— 100O0C auslaufen gelassen, bzw. direkt gepreßt zu Brillenglasrohlingen (Nahteilen bzw. Fernteüen).Between 1250 ° by 1 . 1300 ° the mixture in the Pt-crucible or a ceramic pan is melted, refined, homogenized by stirring and 950- 100O 0 C allowed to run out, or directly pressed to the spectacle lens blanks (seam ropes or Fernteüen).

SiO2
B2O3 SiO 2
B 2 O 3 11.50
16.1511.50
16.15 8.20
19308.20
1930 MgO
WO3 MgO
WHERE 3 1030
15.001030
3 p.m. 12.25
16.6012.25
16.60 1235
16351235
1635 11.40
163511.40
1635 11.65
173511.65
1735 AI2O,
WOj
Ta2O-,AI 2 O,
WOj
Ta 2 O-, 10J0
16.2010J0
16.20 Li2O
Na2O
K2OLi 2 O
Na 2 O
K 2 O 1.60
2.00
2.051.60
2.00
2.05 1.65
2.05
2.101.65
2.05
2.10 1.8060
33.75
3.731.8060
33.75
3.73 135
1.20
1.80135
1.20
1.80 1.65
0.90
0.951.65
0.90
0.95 130
1.20
130130
1.20
130 2.252.25 1.25
0.65
l.CO1.25
0.65
l.CO 1.7950
3460
3.881.7950
3460
3.88 130
1.90
2.05130
1.90
2.05 CaO
ZnOCaO
ZnO 9.95
3359.95
335 9.95
3.609.95
3.60 16.6016.60 10.05
3.6005/10
3.60 4.854.85 6.756.75 9.40
1.709.40
1.70 9.809.80 La2O3
Y2O3
ZrO2 La 2 O 3
Y 2 O 3
ZrO 2 25.40
330
7.0025.40
330
7:00 25.25
3.40
7.0025.25
3.40
7:00 14.90
3.40
7.7014.90
3.40
7.70 25.80
330
7.1025.80
330
7.10 24.20
6.6524.20
6.65 28.25
4.9528.25
4.95 17.55
3.20
6.7517.55
3.20
6.75 22.50
3.30
4.0022.50
3.30
4.00 TiO2
Nb2O5 TiO 2
Nb 2 O 5 935
8.15935
8.15 9.20
8309.20
830 10.45
10.9010.45
10.90 9.48
8.259.48
8.25 12.50
5.7512.50
5.75 5.60
10.655.60
10.65 7.55
7.807.55
7.80 8.70
7.008.70
7:00 4.80
1.604.80
1.60 SrO 13.55SrO 13.55 BaO 13.80BaO 13.80 PbO 14.15PbO 14.15 3.00
4.20
5.853.00
4.20
5.85 nd
vd
/>[g/cm3] nd
vd
/> [g / cm 3 ] 1.8019
34.95
3.801.8019
34.95
3.80 1.7982
35.30
3.791.7982
35.30
3.79 1.8105
35.25
3.811.8105
35.25
3.81 1.8130
3330
3.781.8130
3330
3.78 1.7980
35.80
3.981.7980
35.80
3.98 1.8095
33.00
3.991.8095
33.00
3.99

Claims (1)

32 Ol 34432 Ol 344 Patentansprüche:Patent claims: 1. Hochbrechende optische Gläser mit Brechwerten von 1,79—1,82 und Abbezahlen >32 und mit einer Dichte < 4,0 g/cm3 im System1. High refractive optical glasses with refractive indices of 1.79-1.82 and Abbe numbers> 32 and with a density of <4.0 g / cm 3 in the system SiO2- B2O3- Alkalioxid—Erdalkalioxid—SiO 2 - B 2 O 3 - alkali oxide — alkaline earth oxide— La2O3-ZrO2-TiO2-Nb2O5,La 2 O 3 -ZrO 2 -TiO 2 -Nb 2 O 5 , die sowohl für Brillennahteile als auch für Fernteile geeignet sind, gekennzeichnet durch folgende Zusammensetzung (in Gew.-%):those for both near-eyeglass parts and for distant parts are suitable, characterized by the following composition (in% by weight): 3. Gläser nach Anspruch 1, mit einer Abbezahl >34 und einer Dichte <3,85, gekennzeichnet durch folgende Zusammensetzung:3. Glasses according to claim 1, with an Abbe number> 34 and a density <3.85, characterized by the following composition:
DE19823201344 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 &lE; 4.0 Expired DE3201344C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
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 &lE; 4.0
JP539583A 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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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 &lE; 4.0

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DE3201344A1 DE3201344A1 (en) 1983-07-28
DE3201344C2 true DE3201344C2 (en) 1984-02-16

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DE19823201344 Expired 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 &lE; 4.0

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JP (1) JPS58125637A (en)
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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

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JPS58125637A (en) 1983-07-26
DE3201344A1 (en) 1983-07-28
JPS6332734B2 (en) 1988-07-01

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