CN1071718C - Optical glass for mould pressing - Google Patents
Optical glass for mould pressing Download PDFInfo
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- CN1071718C CN1071718C CN98109371A CN98109371A CN1071718C CN 1071718 C CN1071718 C CN 1071718C CN 98109371 A CN98109371 A CN 98109371A CN 98109371 A CN98109371 A CN 98109371A CN 1071718 C CN1071718 C CN 1071718C
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- glass
- chemical durability
- optical
- optical glass
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Abstract
The invention provides a extruding iptical glass which has such an optical constant as a refractive index (nd) of 1.55 to 1.60, and Abbe number (vd) of 55 to 60 and a low yield point (At), the glass having good stripping feature with shaping articles has better chemical durability, water resistance, acid resistance and meltability than past optical glass. [Methods of resolution]: the optical glass are manufactured by following compositions and the range by weight, 50-55% SiO[2], 4-9% B[2]O[3], 1.5-4% Al[2]O[3], 0.5-2% TiO[2], 2-7% ZnO, 24-30% BaO, 1-4% Li[2]O, 0.5-2.0% K[2]O, while 5-9% Li[2]O+K[2]O.
Description
The present invention relates to SiO
2-B
2O
3-Al
2O
3-TiO
2-ZnO-BaO-Li
2O-K
2The die pressing optical glass of O system, this glass have specific refractory power (nd) 1.55～1.60, and Abbe number (vd) is the optical constant of 55～60 scopes and is fit to mass-produced meltbility and excellent in chemical weather resistance.
As everyone knows, baryta yellow is arranged is glass or dense crown to the opticglass that has the aforementioned lights mathematic(al) constant in the past.For example, in " glass composition databook " 1991 (Japanese glasswork industry meeting distribution), record the glass of a lot of SK (シ ヨ Star ト company product sample title) type as dense crown.But, because the general yield-point of these glass (At) height, much all surpassing 600 ℃, mold temperature height as a result is not suitable as after the compression moulding mold pressing glass of directly making optical element without grinding or grinding.In the compression molding, if the mold temperature of glass increases, because the oxidation of section bar produces problems such as weather resistance, so wish the yield-point of glass low as far as possible (below 600 ℃).As the method that addresses these problems, all glass that adds a large amount of alkalimetal oxides in the glass compositional system has been proposed.If for example, the spy opens in the flat 4-292435 communique, has disclosed SiO in the past
2-B
2O
3Only add alkalimetal oxide in the composition of-BaO system,, proposed with TeO because chemical durability is poor
2System for necessary composition.In addition, the spy opens the SiO that discloses in the clear 60-122747 communique
2-B
2O
3-CaO-Li
2The glass of O system, with above-mentioned the same because of chemical durability, particularly acidproof poor, and the easy browning of glass surface, so uncomfortable cooperation mold pressing glass.
The object of the invention is to provide that both to have kept specific refractory power (nd) be 1.55～1.60, Abbe number (vd) is the optical constant of 55～60 scopes, and the low-yield of suitable mold pressing (At), separability with section bar is good again, and has the die pressing optical glass that is fit to mass-produced meltbility, excellent chemical weather resistance.
For achieving the above object, the present inventor is research experiment with keen determination, found that over not have the specifically SiO of the specified range of announcement
2-B
2O
3-Al
2O
3-TiO
2-ZnO-BaO-Li
2O-K
2The glass of O system has aforementioned given optical constant, is fit to the characteristic of mold pressing, and promptly low-yield, good and have the mass-produced meltbility of being fit to, excellent in chemical weather resistance with the separability of section bar obtains die pressing optical glass, has finished the present invention.
That is, die pressing optical glass of the present invention is characterised in that % counts by weight, by SiO
250～55%, B
2O
34～9%, Al
2O
31.5 TiO～4.0%,
20.5～2.0%, ZnO2～7%, BaO24～30%, Li
2O1～4%, K
2O2～6% and Li
2O+K
2O is 5.0～9.0%, Sb
2O
3Each of 0～1% scope becomes to be grouped into, and has that specific refractory power (nd) is 1.55～1.60, Abbe number (vd) is the optical constant of 55～60 scopes.
Limit the reasons are as follows of above-mentioned each composition range:
That is SiO,
2As the oxide compound that forms glass is necessary composition, if be lower than 50%, the chemical durability of glass is poor, surpasses at 55% o'clock, and meltbility worsens.
B
2O
3As the oxide compound that forms glass, be important composition, if be lower than 4%, meltbility worsens, and surpasses at 9% o'clock, chemical durability is poor.
Al
2O
3Chemical durability to raising glass is effective composition, if be lower than 1.5%, its effect is undesirable, surpasses at 4% o'clock, and meltbility worsens.
TiO
2Be the necessary composition that improves the glass chemistry weather resistance,, to no effect, surpass at 1.5% o'clock, can not obtain desirable optical constant if below 0.5%.
ZnO is the necessary composition that improves chemical durability, if be lower than 2%, its effect is bad, surpasses at 7% o'clock, and anti-devitrification worsens.
BaO be the optical constant that keeps given, by with the B of defined specified range of the present invention
2O
3Coexistence had both kept the low-yield characteristic, showed the important component of excellent durability again, if be lower than 24%, its effect is undesirable, surpassed at 30% o'clock, can not keep given optical constant.
Li
2O, K
2The O alkalimetal oxide is the important component of giving glass low-yield characteristic and improving the meltbility effect.In these compositions, Li especially
2The effect that O gives glass low-yield characteristic is especially big, so be epochmaking composition, in order both to keep the anti-devitrification of glass, brings into play its effect again, must be more than 1%, and to obtain the good glass of chemical durability, should be controlled at below 4%.K
2O is the neccessary composition that improves glass melting, if be lower than 2%, effect is low, surpasses at 6% o'clock, deteriorates chemical durability.Though the alkali composition also can be used Na
2O, but, should use Li because of being difficult to make the glass of chemical durability
2O and K
2O.Li
2O and K
2If the total amount of O is below 5%, and meltbility worsens, and yield-point can not be dropped to below 600 ℃.Obtain the good especially glass of chemical durability, should be controlled at below 9%.
Sb
2O
3Finings during as glass melting can at random add, and its amount is abundant 1% with in.In addition, to glass of the present invention, for adjusting optical constant, improve glass melting and anti-devitrification, also can add the composition outside above-mentioned as required, for example CaO, MgO and SrO add up to 3%.
To form in the composition example (No.A and No.B) of example (No.1, No.2) and aforementioned opticglass in the past about the enforcement of opticglass of the present invention below, test result, the meltbility test-results of the glass refraction that obtains respectively (nd), Abbe number (vd), yield-point (At) and chemical durability (powder method) are shown in table 1.Chemical durability (powder method) shows with the method for Japanese opticglass industry member defined, the scale that dipping back weight reduces in liquid.This value is fewer, shows that chemical durability better.The good glass of concluding chemical durability is that acid resistance is lower than 0.20%, water tolerance is lower than 0.05%.Meltbility is illustrated under 1400 ℃ the melt temperature whether deaeration, the representing with O of deaeration, the representing with X of not deaeration.
After mixing with raw material in given common optics such as ratio weighing oxide compound, carbonate, nitrate and oxyhydroxide, be added in the platinum crucible, the fused difficulty is different with composition, general under 1300～1400 ℃ temperature, behind fusion in about 2～4 hours, the stirring homogeneous, be cast in the mould,, can easily make these glass test portions through slowly cooling.
[table 1]
| Embodiment | Comparative example | |||
| 1 | 2 | 3 | 4 | |
| SiO 2 | 52.0 | 53.8 | 52.6 | 55.2 |
| B 2O 2 | 6.0 | 5.6 | 7.0 | 2.6 |
| Al 2O 2 | 3.0 | 3.4 | 1.0 | 4.5 |
| TiO 2 | 1.0 | 0.7 | 1.0 | 0.6 |
| ZnO | 4.0 | 2.9 | 2.1 | |
| CaO | 12.5 | |||
| BaO | 26.7 | 25.4 | 14.2 | 24.4 |
| Li 2O | 3.0 | 3.3 | 1.1 | |
| Na 2O | 4.8 | 3.4 | ||
| K 2O | 4.0 | 4.8 | 5.6 | 6.8 |
| Sb 2O | 0.3 | 0.1 | 0.2 | 0.4 |
| nd | 1.57250 | 1.56804 | 1.57250 | 1.56313 |
| vd | 57.8 | 58.9 | 57.8 | 58.5 |
| At(℃) | 590 | 572 | 610 | 650 |
| Powder method (water tolerance) | 0.04％ | 0.03 | 0.08％ | 0.06％ |
| Powder method (acid resistance) | 0.10％ | 0.14％ | 0.40％ | 0.21 |
| Dissolving property | O | O | × | × |
Found out that by table 1 glass of embodiments of the invention all has given optical constant and the low-yield below 600 ℃ (At), and chemical durability is better than the glass of passing by in the comparative example, its water tolerance is lower than 0.05%, and acid resistance is lower than 0.20%.Meltbility is also good than the glass in the comparative example.In addition, the anti-devitrification of these glass is all good, homogenizes easily.Even though do not list in the table, the glass of embodiment is compared with the opticglass in past in the comparative example in mold process, and is good with the separability of section bar.
As mentioned above, die pressing optical glass of the present invention is because SiO
2-B
2O
3-Al
2O
3-TiO
2-ZnO-BaO-Li
2O-K
2The O system has specific composition, specific refractory power (nd) is 1.55～1.60, Abbe number (vd) is the optical constant of 55～60 scopes and have, with the low-yield below 600 ℃, good with the separability of section bar, and has a fabulous change weather resistance, its water tolerance≤0.05%, acid resistance≤0.20%.Because of meltbility is good, make easily again, be suitable as the mold pressing material.
Claims (1)
1. die pressing optical glass is characterized in that % meter by weight, is become to be grouped into by each of following scope, i.e. SiO
250～55%, B
2O
34～9%, Al
2O
31.5 TiO～4.0%,
20.5～2.0%, ZnO2～7%, BaO24～30%, Li
2O1～4%, K
2O2～6% and Li
2O+K
2O is 5.0～9.0%, Sb
2O
30～1%, and have the optical constant of specific refractory power (nd) 1.55～1.60, Abbe number (vd) 55～60 scopes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP160445/97 | 1997-06-03 | ||
| JP16044597 | 1997-06-03 | ||
| JP160445/1997 | 1997-06-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1201019A CN1201019A (en) | 1998-12-09 |
| CN1071718C true CN1071718C (en) | 2001-09-26 |
Family
ID=15715095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98109371A Expired - Fee Related CN1071718C (en) | 1997-06-03 | 1998-05-29 | Optical glass for mould pressing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1071718C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106883842B (en) * | 2017-02-24 | 2019-12-06 | 河北利福光电技术有限公司 | High-reliability silicate fluorescent powder and surface modification method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105955A (en) * | 1993-11-26 | 1995-08-02 | 株式会社小原 | Optical glass |
| CN1126704A (en) * | 1994-10-06 | 1996-07-17 | 株式会社小原 | Optical glass |
| CN1141889A (en) * | 1994-08-05 | 1997-02-05 | 株式会社小原 | Optical glass |
-
1998
- 1998-05-29 CN CN98109371A patent/CN1071718C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1105955A (en) * | 1993-11-26 | 1995-08-02 | 株式会社小原 | Optical glass |
| CN1141889A (en) * | 1994-08-05 | 1997-02-05 | 株式会社小原 | Optical glass |
| CN1126704A (en) * | 1994-10-06 | 1996-07-17 | 株式会社小原 | Optical glass |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1201019A (en) | 1998-12-09 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20010926 Termination date: 20110529 |