CN1205991A - Optical glass - Google Patents
Optical glass Download PDFInfo
- Publication number
- CN1205991A CN1205991A CN 98115206 CN98115206A CN1205991A CN 1205991 A CN1205991 A CN 1205991A CN 98115206 CN98115206 CN 98115206 CN 98115206 A CN98115206 A CN 98115206A CN 1205991 A CN1205991 A CN 1205991A
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- Prior art keywords
- glass
- sio
- total amount
- component
- zro
- Prior art date
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Abstract
An optical glass is excellent in resistance to devitrification and melting property, stable and homogeneous. This optical glass comprises a composition of 1-15 wt.% SiO2 , 25-45 wt. % B2 O3 , 0-2 wt. % P2 O5 , and 0.1-5 wt.% Al2 O3 with the proviso that SiO2 +Al2 O3 >=5.5 wt.%, 35-50 wt.% La2 O3 , with the proviso that SiO2 +B2 O3 +La2 O3 >=78 wt.%, 0-<2 wt.% TiO2 , 3-10 wt.% ZrO2 , with the proviso that SiO2 +ZrO2 >=11 wt.%, 0-5 wt.% Nb2 O5 and 0-6 wt.% Ta2 O5 , with the proviso that Nb2 O5 +Ta2 O5 =0-6 wt.%, 0-5 wt.% MgO, 0-5 wt.% CaO, 0-5 wt.% SrO, 0-5 wt.% BaO and 5-10 wt.% ZnO, with the proviso that MgO+CaO+SrO+BaO +ZnO>=5.5 wt.%, 0.1-2 wt.% Li2 O, 0-2 wt.% NaO2 , 0-2 wt.% K2 O and 0-1 wt.% Sb2 O3 .
Description
(detailed description of the invention)
〔0001〕
(technical field that the present invention belongs to)
The present invention relates to have the optical constant scope is that specific refractory power (nd) 1.68 to 1.75 and Abbe number are the opticglass more than 50.
(0002) (prior art)
We know, existing optical glass with above-mentioned optical constant scope is, such as, B
2O
3-La
2O
3-Y
2O
3(yttria) and/or Gd
2O
3Valent metal oxide class glass more than (gadolinium sesquioxide).Although this glass contains the La of a greater number
2O
3Component is difficult to separate out and devitrification, thereby is more stable glass, but its viscosity is very low, and the glass ware forming difficulty has just been added SiO for adjusting viscosity
2Component.Yet, in this case, SiO
2Be difficult to fusion, therefore exist the so-called problem that is difficult to obtain not having the brush line homogeneous glass.Also having a problem is exactly Y
2O
3And Gd
2O
3Expensive raw material price, the manufacturing cost of glass are just high.
(0003) (problem that invention is solved)
The objective of the invention is comprehensively to eliminate the various shortcomings that exist in the aforementioned prior art, provide to have aforementioned institute how optical constant and do not contain expensive Y
2O
3, Gd
2O
3And Ta
2O
5Deng raw material form or not take them for must the devitrification resistance of component and stablizing and homogeneous optical glass of meltbility excellence.(0004) (method of dealing with problems)
The inventor furthers investigate for addressing the above problem, and has found the SiO in the specific composition scope
2-B
2O
3-La
2O
3-ZrO
2-RO-Li
2Add Al in the O class glass
2O
3Component can achieve the above object, thereby has finished the present invention.That is, the optical glass of the present invention that achieves the above object is characterized in that as described in claim requires 1, its weight consists of silica (SiO
2) 1% to 15%, diboron trioxide (B
2O
3) 25% to 45%, phosphorus pentoxide (P
2O
5) 0 to 2%, alundum (Al2O3) (Al
2O
3) 0.1% to 5% and SiO
2With Al
2O
3Total amount more than or equal to 5.5%, lanthanum sesquioxide (La
2O
3) 35% to 50% and SiO
2, B
2O
3And La
2The total amount of O more than or equal to 78%, titanium dioxide (TiO
2) 0 to less than 2%, zirconium dioxide (ZrO
2) 3% to 10% and SiO
2And ZrO
2Total amount more than or equal to 11%, niobium pentaoxide (Nb
2O
5) 0 to 5%, tantalum pentoxide (Ta
2O
5) 0 to 6% and Nb
2O
5And Ta
2O
5Total amount be 0 to 6%, the total amount of magnesia (MgO) 0 to 5%, calcium oxide (CaO) 0 to 5%, strontium oxide strontia (SrO) 0 to 5%, barium monoxide (BaO) 0 to 5%, zinc oxide (ZnO) 5% to 10% and MgO, CaO, SrO, BaO and ZnO more than or equal to 5.5%, lithia (Li
2O) 0.1% to 2%, sodium oxide molybdena (Na
2O) 0 to 2%, potassium oxide (K
2O) 0 to 2% and antimony oxide (Sb
2O
3) 0 to 1%.〔0005〕
Claim requires the special preferable case of 2 described the present invention's of being optical glass, and it is characterised in that its weight consists of SiO
25% to 9%, B
2O
330% to 40%, Al
2O
30.5% to 3% and SiO
2And Al
2O
3Total amount more than or equal to 5.5%, La
2O
342% to 48% and SiO
2, B
2O
3And La
2O
3Total amount more than or equal to 78%, ZrO
25% to 8% and SiO
2And ZrO
2Total amount more than or equal to 11%, Ta
2O
50 to 6%, MgO 0 to 5%, CaO0 to 5%, SrO 0 to 5%, BaO 0 to 5%, ZnO 6% to 10%, Li
2O0.1% to 1%, Na
2O 0 to 1%, K
2O 0 to 1% and Sb
2O
30 to 0.5%.(0006) (invention example)
Its each component of the present invention's opticglass is defined in the reasons are as follows of above-mentioned compositing range:
SiO
2Component is the oxide of glass ware forming, simultaneously at the B that contains resemble the present invention
2O
3And La
2O
3Deng the viscosity of still adjusting glass in the more glass of group component with suppress the active ingredient of crystallization tendency, if above-mentioned effect is just insufficient during its quantity not sufficient 1%, and the meltbility of glass produces not fusant easily with regard to variation when surpassing 15%.In order to obtain the glass of good uniformity, SiO
2Group component with 5%～9% for well.〔0007〕
With SiO
2The same, B
2O
3Component also is to form the glass oxide, to the present invention such contain La
2O
3The glass that group component is more, it is indispensable, if be difficult to obtain desired refractive index during its quantity not sufficient 25%, and refractive index is crossed low and the chemical resistance variation when surpassing 45%.For obtaining having institute's phase scope optical constant and more excellent chemical-resistant glass, the present invention's B
2O
3The amount of component in 30% to 40% scope for well.〔0008〕
Al
2O
3Component has the chemical resistance that improves glass and adjusts viscosity and suppress devitrification, and the effect of stabilisation, but above-mentioned effect is insufficient during its quantity not sufficient 0.1%, on the contrary, surpasses that 5% glass devitrification increases and bad.In order to obtain the more excellent glass of chemical resistance and devitrification resistance, Al
2O
3The amount of component is better in 0.5% to 3% scope.Also have, in the present invention for making glass keep appropriate viscosity, SiO
2Composition and Al
2O
3The total amount of composition should be more than 5.5%.〔0009〕
La
2O
3Component is indispensable by obtaining the low dispersed stabilized glass of high index of refraction, is difficult to such an extent that reach the glass of the object of the invention when its quantity not sufficient 35%, on the contrary, and the tendency toward devitrification of glass increase when surpassing 50% and be difficult to obtain stable glass.For obtaining having institute's phase optical constant and the more excellent uniform glass of devitrification resistance, La
2O
3The amount of component is better in 42% to 48% scope.Also have, for obtaining stabilized glass of the present invention, SiO
2, B
2O
3And La
2O
3The total amount of three kinds of components should be more than 78%.〔0010〕
ZrO
2Suppress devitrification when the effect of component is to make glass that high refractive index is arranged and separate out and improve the glass chemical resistant properties, when its quantity not sufficient 3%, these effects are insufficient, surpass at 10% o'clock and then separate out crystallization easily in the glass.For obtaining excellent devitrification resistance and more stable glass, ZrO
2The amount of component is better 5% to 8%.Also have, for obtaining the glass of chemical resistance excellence, SiO
2Composition and ZrO
2The total amount of composition should be more than 11%.〔0011〕
The ZnO component has fusion that promotes frit and the effect that enlarges the vitrifying scope, and above-mentioned effect is insufficient during as if quantity not sufficient 5%, causes the chemical resistant properties variation easily and surpass at 10% o'clock.For obtaining chemically stable and promote fully the effect of melting, its amount is better in 6% to 10% scope.〔0012〕
For the fusion that promotes frit and enlarge vitrified scope and can under 5% limit, add alkaline-earth metal type oxide components such as MgO, CaO, SrO and BaO separately arbitrarily.For obtaining uniform and stable glass of the present invention, 1 or the total amount more than 2 kind in ZnO, MgO, CaO, SrO and the BaO component should be more than 5.5%.〔0013〕
At SiO
2Add Li in the raw material glass
2The O component has the fused of promotion effect, and above-mentioned effect is insufficient during its quantity not sufficient 0.1%, surpasses 2% and can make the viscosity of glass low excessively, is easy to generate brush line and is easy to generate crystallization in glass when the casting glass ware forming.Scope is 0.1% to 1% preferably.〔0014〕
In the optical glass of the present invention, except said components, for reaching purposes such as adjusting optical constant, also can add P
2O
5, TiO
2, Ta
2O
5And Nb
2O
5Etc. component, its amount is respectively until 2%, optional in the less than 2%, 6% and 5% limit, but because Ta
2O
5And Nb
2O
5Expensive raw material price, and the tendency that reduces the glass devitrification resistance is arranged, so the total amount of these two kinds of components should be until in 6% the limit.Also has P
2O
5Make glass chemical resistance downward trend, TiO
2And Nb
2O
5Make the colored tendency of glass, it is better therefore not contain these three kinds of components.For improving the purposes such as meltbility of glass, though can add arbitrarily Na
2O and K
2The O component, but amount with separately until 2% just enough, separately until 1% better.Sb can be at random added in deaeration during for the promotion glass melting
2O
3Component, but its amount is until 1% namely enough, until 0.5% is better.
(0015) (embodiment)
Below table 1, table 2 and table 3 provided the suitable embodiment (No.1 to No.26) and their optical constant (nd, vd) of opticglass of the present invention.〔0016〕
The common optical glass such as weighing oxide, carbonate and nitrate uses raw material after mixing, with platinum crucible etc. in about 1200 ℃ to 1400 ℃ lower meltings, clarification, stirred 2 to 4 hours, pour into then slowly cooling in the type tool of preheating, just can make easily optical glass of the present invention.〔0017〕
Table 1
(weight %)
| Embodiment | |||||||||
| ????1 | ????2 | ????3 | ????4 | ????5 | ????6 | ????7 | ????8 | ????9 | |
| SiO 2 | ??5.00 | ??9.00 | ??7?30 | ??5.20 | ??6.00 | ??6.90 | ??5.50 | ??8.60 | ??5.80 |
| B 2O 3 | ??36.10 | ??32.00 | ??30.00 | ??40.00 | ??31.38 | ??35.48 | ??33.90 | ??33.70 | ??32.50 |
| Al 2O 3 | ??1.00 | ??1.00 | ??0.50 | ??0.70 | ??1.70 | ??0.50 | ??3.00 | ??2.00 | ??2.00 |
| La 2O 3 | ??42.60 | ??44.60 | ??47.45 | ??42.30 | ??43.60 | ??43.20 | ??42.90 | ??42.00 | ??48.00 |
| ZrO 2 | ??6.50 | ??5.50 | ??6.50 | ??6.28 | ??6.60 | ??6.90 | ??5.50 | ??5.50 | ??5.25 |
| ZnO | ??8.50 | ??7.30 | ??8.00 | ??6.30 | ??8.50 | ??6.50 | ??8.90 | ??7.00 | ??6.20 |
| Li 2O | ??0.20 | ??0.50 | ??0.20 | ??0.20 | ??0.20 | ??0.50 | ??0.20 | ??0.80 | ??0.20 |
| Sb 2O 3 | ??0.10 | ??0.10 | ??0.05 | ??0.02 | ??0.02 | ??0.02 | ??0.10 | ??0.10 | ??0.05 |
| BaO | ??2.00 | ??0.30 | |||||||
| ?nd | 1.7244 | 1.7225 | 1.7438 | 1.7089 | 1.7340 | 1.7220 | 1.7196 | 1.7101 | 1.7318 |
| ?vd | ??52.7 | ??52.8 | ??51.1 | ??55.0 | ??51.5 | ??53.0 | ??52.8 | ??53.7 | ??52.4 |
Table 2
(weight %)
| Embodiment | |||||||||
| ????10 | ????11 | ????12 | ????13 | ????14 | ????15 | ????16 | ????17 | ????18 | |
| SiO 2 | ??6.50 | ??7.00 | ??5.50 | ??6.50 | ??7.50 | ??7.50 | ??6.00 | ??6.00 | ??5.50 |
| B 2O 3 | ??37.47 | ??32.60 | ??31.50 | ??33?50 | ??31.00 | ??33.00 | ??35.00 | ??39.00 | ??33.50 |
| Al 2O 3 | ??1.00 | ??2.00 | ??0.70 | ??1.00 | ??2.00 | ??1.50 | ??0.80 | ??4.00 | ??1.00 |
| La 2O 3 | ?43.30 | ?43.30 | ?46.00 | ?43.20 | ?43.20 | ?44.00 | ?45.50 | ?35.60 | ?42.30 |
| ZrO 2 | ??5.00 | ??8.00 | ??7.50 | ??5.40 | ??6.40 | ??6.40 | ??5.50 | ??6.10 | ??5.50 |
| ZnO | ??6.20 | ??6.50 | ??6.00 | ?10.00 | ??9.00 | ??6.30 | ??6.50 | ??6.50 | ??6.50 |
| Li 2O | ??0.50 | ??0.50 | ??0.50 | ??0.30 | ??0.10 | ??1.00 | ??0.20 | ??0.30 | ??0.50 |
| Sb 2O 3 | ??0.03 | ??0.10 | ??0.10 | ??0.10 | ??0.20 | ??0.30 | ??0.50 | ??1.00 | ??0.20 |
| P 2O 5 | ??1.50 | ||||||||
| MgO | ??5.00 | ||||||||
| CaO | ??0.60 | ||||||||
| Ta 2O 5 | ??2.20 | ||||||||
| ?nd | 1.7409 | 1.7323 | 1.7437 | 1.7256 | 1?7282 | 1.7266 | 1.7269 | 1.6874 | 1.7189 |
| ?vd | ??54.6 | ??51.6 | ??50.0 | ??52.4 | ??51.8 | ??51.9 | ??52.9 | ??55.5 | ??53.1 |
Table 3
(weight %)
| Embodiment | ||||||||
| ????19 | ????20 | ????21 | ????22 | ????23 | ????24 | ????25 | ????26 | |
| SiO 2 | ??5.50 | ??5.50 | ??5.80 | ?13.00 | ??7.10 | ??5.40 | ??5.60 | ??5.60 |
| B 2O 3 | ??33.50 | ??32.60 | ??32.80 | ??27.00 | ??31.00 | ??33.30 | ??31.50 | ??31.50 |
| Al 2O 3 | ??1.00 | ??2.00 | ??2.00 | ??3.00 | ??0.10 | ??0.77 | ??1.50 | ??1.50 |
| La 2O 3 | ??42.30 | ??42.50 | ??42.25 | ??43.00 | ??49.00 | ??42.30 | ??43.00 | ??43.00 |
| ZrO 2 | ??5.50 | ??5.50 | ??5.30 | ??3.50 | ??4.00 | ??5.60 | ??5.50 | ??5.50 |
| ZnO | ??6.50 | ??6.60 | ??6.30 | ??5.00 | ??6.50 | ??6.30 | ??7.00 | ??7.00 |
| Li 2O | ??0.50 | ??0.20 | ??0.50 | ??1.50 | ??0.20 | ??0.30 | ??0.10 | ??0.10 |
| Sb 2O 3 | ??0.20 | ??0.10 | ??0.05 | ??0.80 | ??0.10 | ??0.03 | ??0.30 | ??0.30 |
| CaO | ??5.00 | ??1.50 | ??1.00 | ??1.00 | ||||
| SrO | ??5.00 | |||||||
| BaO | ??5.00 | ??0.70 | ??2.50 | ??2.50 | ||||
| TiO 2 | ??1.00 | |||||||
| Nb 2O 5 | ??2.00 | |||||||
| Ta 2O 5 | ??6.00 | |||||||
| Na 2O | ??2.00 | |||||||
| K 2O | ??2.00 | |||||||
| ?nd | 1.7239 | 1.7245 | 1.7228 | 1.7013 | 1.7443 | 1.7353 | 1.7297 | 1.7295 |
| ?v?d | ??52.7 | ??52.6 | ??52.8 | ??54.5 | ??50.6 | ??50.2 | ??51.8 | ??51.6 |
(0020) (effect of invention)
As mentioned above, optical glass of the present invention is the SiO of specific composition scope2-B
2O
3-Al
2O
3-La
2O
3-ZrO
2-RO-Li
2O class glass. Can obtain having the optical constant scope according to the present invention and be refractive index (nd) 1.68 to 1.75, Abbe number (vd) excellent devitrification and the meltbility, stable and uniform optical glass more than 50. And optical glass of the present invention does not contain Y2O
3、Gd
2O
3And Ta2O
3And so on the component of cost of material costliness, perhaps, not as essential component, therefore the cheap this glass this point that makes also is useful.
Claims (2)
- (claim requires 1) a kind of optical glass is characterized in that its weight consists of SiO 21% to 15%, B 2O 325% to 45%, P 2O 50 to 2%, Al 2O 30.1% to 5% and SiO 2With Al 2O 3Total amount more than or equal to 5.5%, La 2O 335% to 50% and SiO 2, B 2O 3And La 2The total amount of O more than or equal to 78%, TiO 20 to less than 2%, ZrO 23% to 10% and SiO 2And ZrO 2Total amount more than or equal to 11%, Nb 2O 50 to 5%, Ta 2O 50 to 6% and Nb 2O 5And Ta 2O 5Total amount be 0 to 6%, the total amount of MgO0 to 5%, CaO 0 to 5%, SrO 0 to 5%, BaO 0 to 5%, ZnO 5% to 10% and MgO, CaO, SrO, BaO and ZnO more than or equal to 5.5%, Li 2O 0.1% to 2%, Na 2O 0 to 2%, K 2O 0 to 2% and Sb 2O 30 to 1%.
- (claim requires 2) claim requires 1 described optical glass, it is characterized in that its weight consists of SiO 25% to 9%, B 2O 330% to 40%, Al 2O 30.5% to 3% and SiO 2And Al 2O 3Total amount more than or equal to 5.5%, La 2O 342% to 48% and SiO 2, B 2O 3And La 2O 3Total amount more than or equal to 78%, ZrO 25% to 8% and SiO 2And ZrO 2Total amount more than or equal to 11%, Ta 2O 50 to 6%, MgO 0 to 5%, CaO 0 to 5%, SrO 0 to 5%, BaO 0 to 5%, ZnO 6% to 10%, Li 2O0.1% to 1%, Na 2O 0 to 1%, K 2O 0 to 1% and Sb 2O 30 to 0.5%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP184479/97 | 1997-06-24 | ||
| JP184479/1997 | 1997-06-24 | ||
| JP18447997 | 1997-06-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1205991A true CN1205991A (en) | 1999-01-27 |
| CN1174929C CN1174929C (en) | 2004-11-10 |
Family
ID=34385889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981152066A Expired - Fee Related CN1174929C (en) | 1997-06-24 | 1998-06-23 | Optical glass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1174929C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143127A (en) * | 2013-04-18 | 2015-12-09 | 费罗公司 | Low melting glass composition |
| CN109279772A (en) * | 2017-07-21 | 2019-01-29 | 株式会社小原 | Optical glass, preform and optical element |
| US11225433B2 (en) | 2016-02-19 | 2022-01-18 | Ferro Corporation | Sintering aid for glasses for machinable phyllosilicate based structures |
-
1998
- 1998-06-23 CN CNB981152066A patent/CN1174929C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143127A (en) * | 2013-04-18 | 2015-12-09 | 费罗公司 | Low melting glass composition |
| CN105143127B (en) * | 2013-04-18 | 2019-01-22 | 费罗公司 | Low-melting glass composition |
| US11225433B2 (en) | 2016-02-19 | 2022-01-18 | Ferro Corporation | Sintering aid for glasses for machinable phyllosilicate based structures |
| CN109279772A (en) * | 2017-07-21 | 2019-01-29 | 株式会社小原 | Optical glass, preform and optical element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1174929C (en) | 2004-11-10 |
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| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20041110 Termination date: 20150623 |
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| EXPY | Termination of patent right or utility model |