US4076647A
Expired / Lapsed
US
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Optical glass
Assignee: Schott AG
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Filing: 1975-07-22
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Granted: 1978-02-28
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Expires: 1995-07-22
Abstract
Abstract An optical glass with a path length independent of temperature comprises between 40 and 55% by weight P 2 O 5 , between 40 and 54% by weight BaO and between 6 and 12% by weight Nb 2 O 5 . Part of the BaO may be replaced by SrO or CaO. Minor amounts of SiO 2 or B 2 O 3 may be included as may other metal oxides such as ZnO, Sb 2 O 3 and La 2 O 3 .
Inventors
- 👤 Marga Faulstich
- 👤 Franz Reitmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
236 words
Optical glass with a path length substantially independent of temperature and optical properties within the range: n e = 1.59 to 1.65, and v e = 55 to 46, of which the value Ge abs × 10 6 /° C is not more than 2.0 and the coefficient of expansion α × 10 7 /° C is not more than 123 in the temperature range -30° to 70° C, said glass having a modulus of elasticity (kp/cm 2 ) of between 5600 and 4600, a Poisson's ratio of between 0.270 and 0.300, and consisting essentially of, in weight percent: P 2 o 5 = 40 to 55 BaO = 25 to 54 Nb 2 O 5 = 6 to 12 SiO 2 = 0 to 5 B 2 o 3 = 0 to 5 K 2 o = 0 to 4 MgO = 0 to 5 CaO = 0 to 15 ZnO = 0 to 5 PbO = 0 to 8 CdO = 0 to 15 Sb 2 O 3 = 0 to 15 Nd 2 O 3 = 0 to 10 Al 2 O 3 = 0 to 3 La 2 O 3 = 0 to 5 ZrO 2 = 0 to 2 Ta 2 O 5 = 0 to 5 Wo 3 = 0 to 3 with the sum of the alkaline earth oxides + Nb 2 O 5 at least 46% by weight.
Claim 2
Dependent Claim
236 words
Optical glass with a path length substantially independent of temperature and optical properties within the range: n e = 1.59 to 1.65, and v e = 55 to 46, of which the value Ge abs × 10 6 /° C is not more than 2.0 and the coefficient of expansion α × 10 7 /° C is not more than 123 in the temperature range -30° to 70° C, said glass having a modulus of elasticity (kp/cm 2 ) of between 5600 and 4600, a Poisson's ratio of between 0.270 and 0.300, and consisting essentially of, in weight percent: P 2 o 5 = 40 to 55 BaO = 25 to 54 Nb 2 O 5 = 6 to 12 SiO 2 = 0 to 5 B 2 o 3 = 0 to 5 K 2 o = 0 to 4 MgO = 0 to 5 CaO = 0 to 15 ZnO = 0 to 5 PbO = 0 to 8 CdO = 0 to 15 Sb 2 O 3 = 0 to 15 Nd 2 O 3 = 0 to 10 Al 2 O 3 = 0 to 3 La 2 O 3 = 0 to 5 ZrO 2 = 0 to 2 Ta 2 O 5 = 0 to 5 Wo 3 = 0 to 3 with the sum of the alkaline earth oxides + Nb 2 O 5 at least 46% by weight.
Claim 3
Dependent Claim
21 words
Optical glass according to claim 1, the content of BaO and Nb 2 O 5 being at least 46% by weight.
Claim 4
Dependent Claim
13 words
Optical glass according to claim 1 containing no Nd 2 O 3 .
Claim 5
Dependent Claim
22 words
Glass according to claim 1, which contains between 2 and 10% by weight Nd 2 O 3 for use in laser technology.
Claim 6
Dependent Claim
89 words
Optical glass according to claim 1, characterized in that the Ge abs × 10 6 /° C -value is negative and the glass consists essentially of: P 2 o 5 = 40.0% by weight, BaO = 54.0% by weight, and Nb 2 O 5 = 6.0% by weight, with the following properties: ______________________________________
n.sub.e = 1.63022
v.sub.e = 53.8
s = 3.860
α × 10.sup.7 /° C
-30 - 70° C = 120.9
Tg ° C = 510
##STR10## = -9.53
Ge.sub.abs × 10.sup.6 /° C
= -1.91
______________________________________
Claim 7
Dependent Claim
79 words
Optical glass according to claim 1, which consists essentially of: SiO 2 = 3.0% by weight, P 2 o 5 = 47.0% by weight, BaO = 42.0% by weight, and Nb 2 O 5 = 8.0% by weight, with the following properties: ______________________________________
n.sub.e = 1,60723
v.sub.e = 52.37
s = 3.49
α × 10.sup.7 /° C
= 108.2
-30 - 70° C
Tg ° C = 482
##STR11## = -6.5
Ge.sub.abs × 10.sup.6 /° C
= +0.1
______________________________________
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |