DD292901A5 - Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4 - Google Patents

Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4 Download PDF

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Publication number
DD292901A5
DD292901A5 DD33869190A DD33869190A DD292901A5 DD 292901 A5 DD292901 A5 DD 292901A5 DD 33869190 A DD33869190 A DD 33869190A DD 33869190 A DD33869190 A DD 33869190A DD 292901 A5 DD292901 A5 DD 292901A5
Authority
DD
German Democratic Republic
Prior art keywords
weight
light transmission
glass
optical glass
crystallization stability
Prior art date
Application number
DD33869190A
Other languages
German (de)
Inventor
Eckhart Watzke
Andrea Kaempfer
Angelika Wolfram
Original Assignee
Jenaer Glaswerk,De
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,De filed Critical Jenaer Glaswerk,De
Priority to DD33869190A priority Critical patent/DD292901A5/en
Publication of DD292901A5 publication Critical patent/DD292901A5/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL 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
    • C03C3/00Glass compositions
    • C03C3/04Glass compositions containing silica
    • C03C3/062Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
    • C03C3/074Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc

Abstract

The invention relates to optical glass improved crystallization stability and increased light transmission with refractive indices * and Abbezahlen v (e) 50.4. The glass is suitable for the production of optical components and for photo lenses. According to the invention, the object is achieved by providing the glass composition of {optical glass; Schwerstkronglas; Barium; Light transmission; Kristallisationsstabilitaet; When melt; Camera lenses; optical components}

Description

2. Optical glass according to claim 1, characterized in that it additionally up to 1% by weight of refining agent such. B. As 2 O 3 , Sb 2 O 3 , fluorides, chlorides or other known reducing agents.

Field of application of the invention

The invention relates to optical heavy crown glass improved crystallization stability and increased light transmission with refractive indices n. = 1.660 and Abbezahlen v, = 50.4, which for cost-effective production of lenses for e.g. Photo lenses and other optical components is used.

Characteristic of the known state of the art

It is known that heavy crown glasses from the ternary system BaO-B 2 O 3 -SiO 2 have been derived and these glasses have in dependence of their composition - even at a given optical position - different properties.

A disadvantage of the glasses of the optical layers, = 1.660 and v, = 50.4 is the too low crystallization stability, which does not allow the melting in highly productive tubs.

Another disadvantage is too low light transmission, which causes quality losses and excludes special applications.

The prior art thus described is occupied by the commercial glass SSK5, Code No. 1267. Detailed information is given in Table 1, which shows that the glass has insufficient crystallization stability for continuous trough melts and too low light transmittances. It is unsuitable for manufacture in continuous tub processes.

The need to reduce the crystallization tendency of the optical glasses and to increase the transmission is often justified in the literature, for. B. Hofmann, Ch. And Nordwig, W .: Silikattechnik 33 (1982) No. 2, pp. 56-58.

A solution to the problems is that La 2 Oj is used as the high-index component, although this is actually not necessary to achieve the optical position. That is, La 2 O 3 is introduced into the glass and other high refractive index components ( such as BaO) are simultaneously reduced, such as a solution using, for example, commercial glass SSK N 5 /

658509 discloses. Disadvantageously, however, the batch costs are increased by the La 2 O 3 price, which is much higher than that of the other glass components.

Object of the invention

The aim of the invention is the cost-effective production of a special heavy crown glass with n, about 1.660 and v, about 50.4 in continuous tub process with improved utility value.

Explanation of the essence of the invention

The object of the invention is to determine new glass compositions which have the optical position of n "cn. 1,660 and v. realize about 50.4 and at the same time have such improved crystallization stability that they can be melted in continuously operated tubs. With the ability to melt using modern tub technologies, the benefits of lowering self-consumption, increasing labor productivity, and improving reproducibility of glass properties can be effective.

Another object of the invention is to increase the light transmission with unchanged raw material qualities and thus unchanged raw material costs. In addition, the use of expensive, previously unused in the glass components should also be omitted for reasons Kpsten.

According to the invention the object is achieved in that the glass composition BaO 44.0-47.0% by weight SiO, 25.0-29.0% by weight B 2 O 3 10.0-14.0% by weight ZnO 4.0-5.5% by mass CaO 2.5-4.0% by weight PbO 2.0-8.0% by weight Al 2 O 3 · 0.5-1.5% by weight TiO 2 0.5-1.5% by weight

consist.

To improve the refining, the glass compositions may additionally contain up to 1% by weight of refining agent, such as e.g. B. As 2 O 3 , Sb 2 O 3 , fluorides, chlorides or other reducing agents. It has been found that in conventional glass systems, narrow compositional ranges exist which enable the

to solve tasks of the invention that

- The crystallization area is concentrated, the maximum crystal growth rate is greatly reduced and the entire crystallization range is shifted to much lower temperatures, so that the crystallization has no negative influence

- The light transmission in the UV-near and entire visible spectral region is skyrocketed.

embodiment

Table 1 compares an embodiment according to the invention with the commercial glass SSK5 / 1267. Both glasses were melted under the same conditions in the MF-heated platinum crucible with 2500 g of calculated glass. With virtually the same optical position, the crystallization is reduced and shifted favorable> to lower temperatures. In addition, the abruptly increased spectral internal transmittances for the wavelength λ = 400 nm and 436 nm and the increase in the internal light transmittance T n , were listed. In this case, raw materials of the same purity were used.

table Comparison of an inventive embodiment of the prior art example 1

commercial glass SSK 5/1267 glass syntheses in% by weight

crystallization area

AT (KG max ) Atuoo

45.4 46.0 = 100 mm 28.1 30.8 11.4 9.8 4.7 5.2 3.3 3.6 4.2 - 0.8 0.9 1.4 2.9 0.5 - 0.2 0.8 100.0 100.0 1,660 1,660 50.4 50.4 650-920 0 C 750-1050 ° C about 60 μπι / η about 150pm / dog about 170μηπ / Γΐ approximate lOObzw.-15O 0 C > 36% ^ > 15% V ford

Claims (1)

1. Optical glass improved crystallization stability and increased light transmission with refractive indices n e = 1.660 and Abbe v a = 50.4, which contains at least barium oxide, silicon dioxide, (boric acid, zinc oxide, calcium oxide, titanium dioxide and aluminum oxide, characterized by the following composition:
BaO 44.0-47.0% by weight
SiO 2 25.0-29.0% by weight
B 2 O 3 10.0-14.0% by weight
ZnO 4.0-5.5% by weight
CaO 2.5-4.0% by weight
PbO 2.0-8.0% by weight
Al 2 O 3 0.5-1.5% by weight
TiO 2 0.5-1.5% by weight
DD33869190A 1990-03-14 1990-03-14 Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4 DD292901A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DD33869190A DD292901A5 (en) 1990-03-14 1990-03-14 Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD33869190A DD292901A5 (en) 1990-03-14 1990-03-14 Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4

Publications (1)

Publication Number Publication Date
DD292901A5 true DD292901A5 (en) 1991-08-14

Family

ID=5617065

Family Applications (1)

Application Number Title Priority Date Filing Date
DD33869190A DD292901A5 (en) 1990-03-14 1990-03-14 Optical glass improved crystallization stability and increased light transmission with n / c nuctions = 1.660 and v (e) = 50.4

Country Status (1)

Country Link
DD (1) DD292901A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010099939A1 (en) * 2009-03-04 2010-09-10 Schott Ag Crystallizing glass solder and use thereof
US20120065049A1 (en) * 2009-03-04 2012-03-15 Dieter Goedeke Crystallizing glass solders and uses thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010099939A1 (en) * 2009-03-04 2010-09-10 Schott Ag Crystallizing glass solder and use thereof
KR20110128332A (en) * 2009-03-04 2011-11-29 쇼오트 아게 Crystallizing glass solder and use thereof
US20110312482A1 (en) * 2009-03-04 2011-12-22 Dieter Goedeke Crystallizing glass solder and use thereof
CN102341357A (en) * 2009-03-04 2012-02-01 肖特公开股份有限公司 Crystallizing glass solder and use thereof
US20120065049A1 (en) * 2009-03-04 2012-03-15 Dieter Goedeke Crystallizing glass solders and uses thereof
US8658549B2 (en) 2009-03-04 2014-02-25 Schott Ag Crystallizing glass solder and use thereof
US8664134B2 (en) 2009-03-04 2014-03-04 Schott Ag Crystallizing glass solders and uses thereof
AU2010220562B2 (en) * 2009-03-04 2015-06-18 Schott Ag Crystallizing glass solder and use thereof
KR101640275B1 (en) * 2009-03-04 2016-07-15 쇼오트 아게 Crystallizing glass solder and use thereof

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