DE1926959B2 - Lead and thorium-free optical glass that is stable against devitrification and has a high refractive index of around 1.900 and a relatively low dispersion of around 40 based on lanthanum tantalum oxide - Google Patents
Lead and thorium-free optical glass that is stable against devitrification and has a high refractive index of around 1.900 and a relatively low dispersion of around 40 based on lanthanum tantalum oxideInfo
- Publication number
- DE1926959B2 DE1926959B2 DE19691926959 DE1926959A DE1926959B2 DE 1926959 B2 DE1926959 B2 DE 1926959B2 DE 19691926959 DE19691926959 DE 19691926959 DE 1926959 A DE1926959 A DE 1926959A DE 1926959 B2 DE1926959 B2 DE 1926959B2
- Authority
- DE
- Germany
- Prior art keywords
- around
- refractive index
- thorium
- lead
- 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
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
- C03C3/04—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
Description
Die i'ftnii.jrtf bcjseh* %tch auf ein gegen F ntglasung •uhäiev. yi.tt- «nd t',i4nnmfreiei optischen Glas mit h her Brech'inr»/ahl »on etwa 1900 und relativ sermger Dispersion »υπ et*« 40 auf der Basis von ! nthart- Γ ii;a!-r>tid.The i'ftnii.jrtf bcjseh *% tch on a against F ntglasung • uhäiev. yi.tt- "nd t ', i4nnm-freei optical glass with higher refraction" / ahl "on around 1900 and relatively less dispersion" υπ et * "40 based on! nthart- Γ ii; a! -r> tid.
e Glaser auf ifcr Bat» von Bleioxid sind Dt« fortschrtrtcrKii· Entwicklung im Gerätebau erforderte verbesserte optische Systeme und hat zur f.nt«icUuni von Gütern geführt, die andere !4eijlloxide al·, ßtetox'd enthalten, wobei die, lemeren eigenen, gute' optischen Eigenschaften erzielt, jedoch gegenüber diesen verbesserte physikalische Eigenschaften erreicht werden.e glasses on ifcr bat »are made of lead oxide Dt «progressschrtrtcrKii · Development in device construction required improved optical systems and has led to the uni of goods, the other ! 4eijlloxide al ·, ßtetox'd, where the, Lemeren's own 'good' optical properties are achieved, however, improved physical properties compared to these can be achieved.
Das die Brechungszahl erhöhende Tl.oriumoxid »ar hierbei nach Möglichkeit zu vermeiden, da es sehr teuer ist. So ist durch die schweizerische Patentschrift 285 073 ein thoriumfreies GUs mit einem hohen Lanthanoxidanteil bekannt, das eine Brechungszahl von 1.851 aufweist. Der hohe Lanthanoxidgehalt zeitigt jedoch eine hohe Neigung zum Entglasen, die unerwünscht ist.The refractive index of the increasing Tl.oriumoxid "ar this be avoided if possible, because it is very expensive. A thorium-free GU with a high proportion of lanthanum oxide and a refractive index of 1,851 is known from Swiss patent specification 285 073. The high lanthanum oxide content, however, has a high tendency to devitrify, which is undesirable.
Bekannt ist auch ein Glas mit gleichen Anteilen von Tantaloxid und Titanoxid, das ebenfalls eine hohe Brechungszahl aufweist, jedoch nu' eine geringe Dispersion von 19,1 hat.Also known is a glass with equal proportions of tantalum oxide and titanium oxide, which is also high Has refractive index but nu 'has a low dispersion of 19.1.
Durch die deutsche Patentschrift 1188 248 sind 'crner Gläser mit einem hohen Boroxidgehult bekannt, die eine nur geringe Neigung zum Entglasen haben. Innerhalb dieser Gruppe gibt es Gläser mit einer hohen Brech'jngwih! von 1,890 bzw. 1.930, abe' sehr hoher Dispersion von etwa 28, und Gläser mit geringer Dispersion von 39, die wiederum eine nur geringe Brechungsrah! von 1,830 aufweisen.By the German patent specification 1188 248 are 'Crner glasses with a high boron oxide finish are known which have only a slight tendency to devitrify. Within this group there are glasses with a high Break'jngwih! of 1.890 and 1.930 'abe' very higher Dispersion of about 28, and glasses with low dispersion of 39, which in turn are only low Refractive frame! of 1.830.
Der Erfindung liegt die Aufgabe zugrunde, ein gegen Entglasung stablies, b**i- und thoriumfreies optisches Glas zu schaffen, du eine hohe Brechungszahl von etwa 1,900 mit einer nslativ geringen Dispersion von etwa 40 vereinigt, also optimale Eigenschaften iufweist, und auf der Basis von Lanthan-Tantaloxid aufgebaut ist.The invention is based on the object To create stable, b ** i- and thorium-free optical glass against devitrification, you have a high refractive index of around 1,900 with a relatively low dispersion of about 40 combined, thus exhibiting optimal properties, and based on lanthanum tantalum oxide is constructed.
Diese Aufgabe wird erfindungsfeml8 dadurch gelobt, daß das Glas folgende Zusammensetzung hat: 50 bis Γ5 Gewichtsprozent Lanthanoxid (La/),), 15 bis 30 Gewichtsprozent Tantaloxid (Ta/),), 6 N« 9 Gewichtsprozent Siliciumdioxid (SiOi), 7,5 Ni 9,5 Gewicht* rozent Boroxid (B1O,), 6,5 bit 8 Gewichtsprozent Zirkonoxid (ZrO,), 0,1 bi< 5 Gewichtsprozent Germaniumoxid (GeO,) und 0 bii 1 Gewichtaprivent CalziumoKid (CaO).This object is praised according to the invention in that the glass has the following composition: 50 to Γ5 weight percent lanthanum oxide (La /),), 15 to 30 weight percent tantalum oxide (Ta /),), 6N «9 weight percent silicon dioxide (SiOi), 7, 5 Ni 9.5 weight percent boron oxide (B 1 O,), 6.5 bit 8 weight percent zirconium oxide (ZrO,), 0.1 to <5 weight percent germanium oxide (GeO,) and 0 to 1 weight percent calcium oxide (CaO).
Nach einem weiteren Merkmal der Erfindung kann das Glas ferner bi< höchstens 5 Gewichtsprozent Niobiumoxid (Nh1O4) und'oder bis höchstens 10 Gewichtsprozent vttriunioxid (Y/),). auf d;is Gesamtgewicht bezogen enthalten.According to a further feature of the invention, the glass can also contain up to a maximum of 5 percent by weight of niobium oxide (Nh 1 O 4 ) and / or up to a maximum of 10 percent by weight of trioxide (Y /),). based on the total weight.
Das Glas kann in jeder üblichen Weise hergestellt werden. Es ist jedoch wichtig, daß eine sorgiä1'"^ Steuerung des Glühvorgangs erfolgi. damit (lie > . ;-malen Eigenscli >ften erzi. It werden.The glass can be made in any conventional manner. However, it is important that a sorgiä 1 '"^ control of the annealing erfolgi it (lie>;.. -Malen Eigenscli> Ulbricht ften be It..
Nachstehend werden zwei bevorzugte Zusamminsetzungen von Gläsern nach der Erfindung in Ge-Wichtsprozenten angegeben.The following are two preferred compositions of glasses according to the invention in weight percentages specified.
La1O,La 1 O,
Ta1O4 Ta 1 O 4
SiO, .SiO,.
B.O..B.O ..
ZrO,ZrO,
GeO1 GeO 1
CaO.CaO.
Y1O,Y 1 O,
■5 1. Gegen Entglasung stabilem, blei- und rhoriwn-■ 5 1. Stable against devitrification, lead and rhoriwn
freies optisches Glas mit hoher Brechungszahi von etwa 1,900 und relativ geringer Dispersion von etwa 40 auf d?' basis von Lanthan-Tantal mkI, dadurch gekennzeichnet, daß es foigende Zusammensetzung hat:clear optical glass with a high refractive index of about 1,900 and relatively low dispersion of about 40 on d? ' base of lanthanum tantalum mkI, characterized in that it follows Composition has:
50 bis 55 Gewichtsprozent La1O, .50 to 55 percent by weight La 1 O,.
15 bis 20 Gewichtsprozent Ta1O1
6 bis 9 Gewirhtsprozent SiO1
7,5 bis 9,5 Gewichtsprozent J1O,
«,J bis 8 Gewichtsprozent ZrO,
0,1 bis 5 Gewichtsprozent GeO1
0 bis 1 Gewichtsprozent CaO.15 to 20 percent by weight Ta 1 O 1
6 to 9 percent by weight SiO 1
7.5 to 9.5 percent by weight J 1 O,
«, J up to 8 percent by weight ZrO,
0.1 to 5 percent by weight GeO 1
0 to 1 percent by weight CaO.
2. Glas nach Anspruch 1 Jadurch gekenn- «· zeichnet. d»ö zusätzlich Niobiumoxid (Nb5O,! mit hi· höchstem 5 Gewichtsprozent, auf das Gesamtgewicht bezogen, enthalten ist.2. Glass according to claim 1 marked by «· draws. It also contains niobium oxide (Nb 5 O,! with a maximum of 5 percent by weight, based on the total weight.
3. Glas nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zusätzlich Yttriumoxid (Y1O.) mit Ws zu höchstens 10 Gewichtsprozent, auf das Gesamtgewicht bezogen, enthalten ist.3. Glass according to claim 1 or 2, characterized in that in addition yttrium oxide (Y 1 O.) with Ws to a maximum of 10 percent by weight, based on the total weight, is included.
4. Glas nach Anspruch 1, gekennzeichnet durch folgende Zusammensetzung in Gewichtsprozent. bezogen auf das Gesamtgewicht: La1O1 53.31,4. Glass according to claim 1, characterized by the following composition in percent by weight. based on the total weight: La 1 O 1 53.31,
5· Ta1O, 19.01, StO, 6,70. B1O, 8,89, ZrO, 7.63. GeO, 3.84, CaO 0.62.5 · Ta 1 O, 01/19, StO, 6.70. B 1 O, 8.89, ZrO, 7.63. GeO, 3.84, CaO 0.62.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2526768A GB1255497A (en) | 1968-05-27 | 1968-05-27 | Glass compositions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1926959A1 DE1926959A1 (en) | 1969-12-04 |
| DE1926959B2 true DE1926959B2 (en) | 1971-04-01 |
Family
ID=10224940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19691926959 Pending DE1926959B2 (en) | 1968-05-27 | 1969-05-23 | Lead and thorium-free optical glass that is stable against devitrification and has a high refractive index of around 1.900 and a relatively low dispersion of around 40 based on lanthanum tantalum oxide |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1926959B2 (en) |
| FR (1) | FR2009390A1 (en) |
| GB (1) | GB1255497A (en) |
| NL (1) | NL6907991A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2653581A1 (en) * | 1975-11-25 | 1977-06-02 | Nippon Kogaku Kk | Optical glass based on oxides of silicon, boron and lanthanum - having high index of refraction and low dispersion |
| DE3130039A1 (en) * | 1981-07-30 | 1983-03-17 | Schott Glaswerke, 6500 Mainz | CDO-THO (DOWN ARROW) 2 (DOWN ARROW) - FREE, HIGHLY BREAKING OPTICAL GLASS WITH OPTICAL LOCATION ND = 1.85 - 2.05 AND VD 43 - 25 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9111121U1 (en) * | 1991-09-07 | 1991-10-24 | Hassomat Maschb Gmbh & Co Kg | |
| JP3750984B2 (en) * | 2000-05-31 | 2006-03-01 | Ｈｏｙａ株式会社 | Optical glass and optical product manufacturing method |
-
1968
- 1968-05-27 GB GB2526768A patent/GB1255497A/en not_active Expired
-
1969
- 1969-05-23 NL NL6907991A patent/NL6907991A/xx unknown
- 1969-05-23 FR FR6916938A patent/FR2009390A1/fr not_active Withdrawn
- 1969-05-23 DE DE19691926959 patent/DE1926959B2/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2653581A1 (en) * | 1975-11-25 | 1977-06-02 | Nippon Kogaku Kk | Optical glass based on oxides of silicon, boron and lanthanum - having high index of refraction and low dispersion |
| DE3130039A1 (en) * | 1981-07-30 | 1983-03-17 | Schott Glaswerke, 6500 Mainz | CDO-THO (DOWN ARROW) 2 (DOWN ARROW) - FREE, HIGHLY BREAKING OPTICAL GLASS WITH OPTICAL LOCATION ND = 1.85 - 2.05 AND VD 43 - 25 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1255497A (en) | 1971-12-01 |
| DE1926959A1 (en) | 1969-12-04 |
| NL6907991A (en) | 1969-12-01 |
| FR2009390A1 (en) | 1970-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE1075807B (en) | Lanthanum borosilicate glass rich in aluminum oxide | |
| DE2820940C3 (en) | Optical glass with the optical data refractive index nD equal to 1.770 to 1.875 and Abbe number vD equal to 37.5 to 28.5 | |
| DE808754C (en) | Eyeglass | |
| DE1496524B2 (en) | Lead-free, devitrification stable optical glass with a refractive index of at least 1.65 and its use, especially in fiber optics | |
| DE972434C (en) | Eyeglass | |
| DE3245615A1 (en) | OPTICAL GLASS | |
| DE944329C (en) | Clear, Cd-free optical glass | |
| DE1926959B2 (en) | Lead and thorium-free optical glass that is stable against devitrification and has a high refractive index of around 1.900 and a relatively low dispersion of around 40 based on lanthanum tantalum oxide | |
| DE957338C (en) | Practically fluorine-free optical glasses | |
| DE1421877B2 (en) | Optical glass that is stable against devitrification and staining | |
| DE946008C (en) | Transparent optical glass | |
| DE2652747A1 (en) | Thorium free optical glass having high refraction and low dispersion - is based on oxides of boron, lanthanum, yttrium and titanium | |
| DE1771079B1 (en) | COUNTER-REDUCTION AND STABILIZATION OF STABLE GLASSES FOR REFLEX PEARLS WITH CRUCIAL VALUES AT LEAST EQUAL LARGE OR EQUAL 2.2 | |
| DE2653581B2 (en) | Thorium-free optical glass of the basic system SiO2 -B2 O3 -La2 O3 | |
| DE1596749C3 (en) | ||
| DE1033380B (en) | Optical glass | |
| DE2057706A1 (en) | 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 | |
| DE1596749B2 (en) | AT TEMPERATURES BELOW 1400 DEGREES C, EXTENDABLE ALUMINUM SILICATE GLASSES | |
| DE1596768C3 (en) | Glaziers of the system SiO deep 2 Al deep 2 O deep 3 MgO CaO for the production of glass fibers with high tensile strength and high elasticity module that require a relatively low spinning temperature | |
| DE1496083C (en) | Glass for use in glass fibers, which is characterized by resistance to devitrification and, in the case of fiber production temperatures, by low viscosity | |
| DE1496524C (en) | Lead-free, devitrification stable optical glass with a refractive index of at least 1.65 and its use in particular in fiber optics | |
| DE2321356C3 (en) | Optical borosilicate glass of the system SiO deep 2 -B deep 2 O deep 3 -BaO-PbO-La deep 2 O deep 3 with v deep d -1.68 to 1.72 and v deep d = 43 to 48 | |
| DE1958111C3 (en) | Optical glass, resistant to devitrification and chemical influences, with a high refractive index and high scattering power, which contains TeO deep 2 and WO deep 3 as its main components, and a process for its production and its use | |
| DE1496559C (en) | Optical borosilicate glass with high dispersion | |
| DE1147359B (en) | Optical glass |