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DE746997C - Optical glass - Google Patents

Optical glass

Info

Publication number
DE746997C
DE746997C DEJ66111D DEJ0066111D DE746997C DE 746997 C DE746997 C DE 746997C DE J66111 D DEJ66111 D DE J66111D DE J0066111 D DEJ0066111 D DE J0066111D DE 746997 C DE746997 C DE 746997C
Authority
DE
Germany
Prior art keywords
content
optical glass
oxide
boric acid
lanthanum
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
DEJ66111D
Other languages
German (de)
Inventor
Dr Edwin Berger
Dr Karl Rehm
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
Jenaer Glaswerk Schott and Gen
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 Jenaer Glaswerk Schott and Gen filed Critical Jenaer Glaswerk Schott and Gen
Priority to DEJ66111D priority Critical patent/DE746997C/en
Application granted granted Critical
Publication of DE746997C publication Critical patent/DE746997C/en
Expired 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
    • C03C3/04—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
    • 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

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)

Description

Die vorliegende Erfindung· betrifft optische Gläser, bei denen zwischen .der Brechzahl )ij und der Abbeschen Zahl γ die Beziehung besteht: The present invention relates to optical glasses in which the following relationship exists between the refractive index ij and the Abbe number γ:

Hj > 1,86 — 0,004 i', Hj > 1.86 - 0.004 i ',

bei denen also, verglichen nut üblichen optischen Gläsern von derselben Farbenzerstreuung, die Brechzahl verhältnismäßig hoch ist. Es sind Gläser bekanntgeworden, die diese Eigenschaft aufweisen und die zu deren Erzielung neben sonstigen Glasbildnem Borsäure, zweiwertige Oxyde und einen hohen 1 iehali an Lanthanoxyd enthalten. iJa jedoch ein hoher Gehalt an Lanthanoxyd, insbesoiiden- !)ci Anwendung gröllerer Mengen von Kieselsäure, leicht zu Kristallisation führt, hat mau auf die Einführung von Kieselsäure verzichtet und der Xeigung zur Kristallisation durch einen hohen Gehalt an Borsäure entireireugearbeitet. Dies führte aber zu Gläsern von sehr geringer Säurebeständigkeit.with which, therefore, compared with the usual optical Lenses of the same color dispersion, the refractive index is relatively high. Glasses have become known which have this property and which are used to achieve them besides other glass formers boric acid, divalent oxides and a high one Contains 1 iehali of lanthanum oxide. iYes however a high content of lanthanum oxide, especially !) ci application of larger amounts of silica, easily leads to crystallization, has poor dispensed with the introduction of silica and the tendency to crystallize through A high level of boric acid is completely processed. However, this led to glasses with very poor acid resistance.

Xach der Erfindung gelangt man zu Gläsern von der oben angegebenen optischen Lage und mit guter Säurebeständigkeit, die sich ohne Kristallisationsneigung erschmelzen lassen, -wenn man den Gehalt au ,Lanthanoxyd nicht über 2o°/0 und den Gehalt an Borsäure nicht über 25 u/o betragen läßt, dagegen den Gehalt an Baryt mit mindestens 450Z0 bemil.it. Baryt kann dabei zum Teil durch andere EnI-alkalioxyde sowie durch Zinkoxyd und Blei-(ixyd ersetzt werden, darf jedoch nicht weniger als 25 "/u betragen.Xach of the invention leads to glasses of the above optical layer and with good acid resistance, which can be smelted without crystallization tendency, -if one au content, lanthanum oxide not 2o ° / 0 and the content of boric acid is not more than 25 and / or can be, on the other hand the content of barite with at least 45 0 Z 0 bemil.it. Barite can partly be replaced by other EnI alkali oxides as well as by zinc oxide and lead oxide, but must not be less than 25 "/ u.

liei den neuen Gläsern ist es niügli'ch, zur Erhöhung der Säurebeständigkeit größere Mengen von Kieselsäure einzuführen, ohne dall sieh Kristallisation ergibt; zur Erzielung einer hohen Säurebeständigkeit empliehlt es sich dabei, den Kieselsäuregehalt mit mindestens iou/0 zu bemessen.With the new glasses it is not necessary to introduce larger quantities of silica in order to increase the acid resistance, without this resulting in crystallization; To achieve a high level of acid resistance, it is advisable to measure the silica content with at least 10 u / 0 .

In der folgenden Tafel sind vier Beispiele der neuen Gläser nach ihrer Zusammensetzung und ihrer optischen Lage angegeben.In the following table are four examples of the new glasses according to their composition and their optical position.

II. IIII IIIIII IVIV SiO2 ...SiO 2 ... 15.015.0 10,010.0 0.50.5 10,010.0 TiOo...TiOo ... —- —- —- —- ZrO2.. .ZrO 2 ... —- 5.05.0 —- —- B2O3....'B 2 O 3 .... ' 15,015.0 r5,or5, o 19.519.5 15.015.0 ALO, . .ALO,. . —- —- —- —- As2O3 ..As 2 O 3 .. —- —- —- —- CaO ...CaO ... —- —- —- ZnO ...ZnO ... —- —- —- PbO . ..PbO. .. —- —- —- Na3O ..Na 3 O .. —- —- —- BaO ...BaO ... 50,050.0 50,050.0 70,070.0 60,060.0 La2O3..La 2 O 3 .. 20,020.0 20,020.0 10,010.0 I5.OI5.O mm 1.6951,695 • 1,71s• 1.71s 1,7181.718 1,6601.660 52,352.3 49,049.0 49,049.0 55.755.7 rr

Claims (2)

Patentansprüche:Patent claims: τ. Optisches Glas, bei demτ. Optical glass in which nd > i,86 — 0,004 ν n d > i, 86 - 0.004 ν ist und das neben sonstigen Glasb'ildnern Borsäure, zweiwertige Oxyde und Lanthanoxyd enthält, dadurch gekenn· „o zeichnet, daß der Gehalt an Borsäure höchstens 25% und der Gehalt an Baryt und anderen Erdalkalioxyden sowie an Zinkoxyd und Bleioxyd zusammen mindestens 45°/0 beträgt, wobei sich der Gehalt an Baryt auf mindestens 25 "/„, der Gehalt an Lanthanoxyd auf höchstens 2o°/0 und der Gehalt an Baryt und Lanthanoxyd zusammen auf mindestens 5o°/0 beläuft.and contains in addition to the other Glasb'ildnern boric acid, divalent oxides and lanthanum oxide, characterized labeled in · "o characterized in that the content of boric acid is more than 25% and the content of barium and other alkaline earth oxides as well as zinc oxide and lead oxide together is at least 45 ° / 0 by weight, wherein the content of barite to at least 25 "/", the content of lanthanum oxide to not more than 2o ° / 0 and the content of barium and lanthanum together amounts to at least 5o ° / 0th 2. Optisches Glas nach Anspruch 1, da- -0 durch gekennzeichnet, daß es mindestens 10% Kieselsäure enthält.2. Optical glass according to claim 1, da- - 0 characterized in that it contains at least 10% silica. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik ist im Erteilungsverfahren folgende Druckschrift in Betracht gezogen worden:To distinguish the subject of the application from the state of the art is in the granting procedure the following publication has been considered: britische Patentschrift Nr. 462 304.British Patent No. 462,304.
DEJ66111D 1939-12-11 1939-12-12 Optical glass Expired DE746997C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEJ66111D DE746997C (en) 1939-12-11 1939-12-12 Optical glass

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE889098X 1939-12-11
DEJ66111D DE746997C (en) 1939-12-11 1939-12-12 Optical glass

Publications (1)

Publication Number Publication Date
DE746997C true DE746997C (en) 1944-09-01

Family

ID=25954166

Family Applications (1)

Application Number Title Priority Date Filing Date
DEJ66111D Expired DE746997C (en) 1939-12-11 1939-12-12 Optical glass

Country Status (1)

Country Link
DE (1) DE746997C (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944329C (en) * 1945-11-09 1956-06-14 Corning Glass Works Clear, Cd-free optical glass
DE946007C (en) * 1945-09-04 1956-07-19 Corning Glass Works Transparent optical glass
DE946008C (en) * 1946-05-27 1956-07-19 Corning Glass Works Transparent optical glass
DE949686C (en) * 1951-02-26 1956-09-27 Jenaer Glaswerk Schott & Gen Practically fluorine-free optical borate glasses
DE959492C (en) * 1952-08-09 1957-03-07 Jenaer Glaswerk Schott & Gen Optical glass containing silica
DE972434C (en) * 1947-11-28 1959-07-23 Corning Glass Works Eyeglass

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB462304A (en) * 1935-09-03 1937-03-03 Eastman Kodak Co New or improved glasses

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB462304A (en) * 1935-09-03 1937-03-03 Eastman Kodak Co New or improved glasses

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE946007C (en) * 1945-09-04 1956-07-19 Corning Glass Works Transparent optical glass
DE944329C (en) * 1945-11-09 1956-06-14 Corning Glass Works Clear, Cd-free optical glass
DE951588C (en) * 1945-11-09 1956-10-31 Corning Glass Works Transparent optical glass
DE946008C (en) * 1946-05-27 1956-07-19 Corning Glass Works Transparent optical glass
DE972434C (en) * 1947-11-28 1959-07-23 Corning Glass Works Eyeglass
DE949686C (en) * 1951-02-26 1956-09-27 Jenaer Glaswerk Schott & Gen Practically fluorine-free optical borate glasses
DE959492C (en) * 1952-08-09 1957-03-07 Jenaer Glaswerk Schott & Gen Optical glass containing silica

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