US3999997A
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Optical glass
Assignee: Schott AG
•
Filing: 1975-07-22
•
Granted: 1976-12-28
•
Expires: 1995-07-22
Abstract
Abstract Optical glass with a path length independent of temperature includes SiO 2 , B 2 O 3 , K 2 O, BaO, ZrO 2 , TiO 2 , Nb 2 O 5 , P 2 O 5 and F in specified percentages by weight, with the sum of the amounts of SiO 2 , B 2 O 3 and P 2 O 5 between 38 and 45% by weight and the sum of the amounts of ZrO 2 and TiO 2 between 12 and 27% by weight.
Inventors
- 👤 Marga Faulstich
- 👤 Franz Reitmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:49
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/07; C03C3/072; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
333 words
Optical flint glass with a path length substantially independent of temperature in the range n e 1.58 to 1.66, v e 44 to 30, the value Ge abs × 10 6 /° C. not exceeding 2.5 and the coefficient of thermal expansion α × 10 7 /° C. in the temperature range of -30° C. to 70° C. not being above 120, said glass consisting essentially of the following components in weight %: ______________________________________
SiO.sub.2 6 to 25
B.sub.2 O.sub.3 15 to 36
K.sub.2 O 13 to 21
BaO 6 to 30
ZrO.sub.2 4 to 17
TiO.sub.2 6 to 10
Nb.sub.2 O.sub.5 4 to 20
P.sub.2 O.sub.5 0 to 12
F 5 to 12
ZnO 0 to 7
PbO 0 to 5
Al.sub.2 O.sub.3 0 to 5
La.sub.2 O.sub.3 0 to 5
Bi.sub.2 O.sub.3 0 to 5
Sb.sub.2 O.sub.3 0 to 5
WO.sub.3 0 to 5
Y.sub.2 O.sub.3 0 to 10
Ta.sub.2 O.sub.5 0 to 10,
______________________________________ wherein said F replaces corresponding proportions of oxygen, wherein the sum of the amounts of SiO 2 , B 2 O 3 and P 2 O 5 is between 38 and 45 weight % and the sum of the amounts of ZrO 2 and TiO 2 is between 12 and 27 weight %, and wherein ZnO, PbO, Al 2 O 3 , La 2 O 3 , Bi 2 O 3 , Y 2 O 3 Gd 2 O 3 , Sb 2 O 3 , Ta 2 O 5 , WO 3 can be added to obtain desired optical properties and to stabilize crystallization without the Ge abs × 10 6 /° C. --value exceeding 2.5, BaO can be replaced by SrO up to 15%, by CaO up to 8%, by MgO up to 5% and Nb 2 O 5 can be replaced by Ta 2 O 5 up to 10 weight %, and wherein K 2 O can be replaced by Na 2 O or Li 2 O by up to 2 weight %.
Claim 2
Dependent Claim
333 words
Optical flint glass with a path length substantially independent of temperature in the range n e 1.58 to 1.66, v e 44 to 30, the value Ge abs × 10 6 /° C. not exceeding 2.5 and the coefficient of thermal expansion α × 10 7 /° C. in the temperature range of -30° C. to 70° C. not being above 120, said glass consisting essentially of the following components in weight %: ______________________________________
SiO.sub.2 6 to 25
B.sub.2 O.sub.3 15 to 36
K.sub.2 O 13 to 21
BaO 6 to 30
ZrO.sub.2 4 to 17
TiO.sub.2 6 to 10
Nb.sub.2 O.sub.5 4 to 20
P.sub.2 O.sub.5 0 to 12
F 5 to 12
ZnO 0 to 7
PbO 0 to 5
Al.sub.2 O.sub.3 0 to 5
La.sub.2 O.sub.3 0 to 5
Bi.sub.2 O.sub.3 0 to 5
Sb.sub.2 O.sub.3 0 to 5
WO.sub.3 0 to 5
Y.sub.2 O.sub.3 0 to 10
Ta.sub.2 O.sub.5 0 to 10,
______________________________________ wherein said F replaces corresponding proportions of oxygen, wherein the sum of the amounts of SiO 2 , B 2 O 3 and P 2 O 5 is between 38 and 45 weight % and the sum of the amounts of ZrO 2 and TiO 2 is between 12 and 27 weight %, and wherein ZnO, PbO, Al 2 O 3 , La 2 O 3 , Bi 2 O 3 , Y 2 O 3 Gd 2 O 3 , Sb 2 O 3 , Ta 2 O 5 , WO 3 can be added to obtain desired optical properties and to stabilize crystallization without the Ge abs × 10 6 /° C. --value exceeding 2.5, BaO can be replaced by SrO up to 15%, by CaO up to 8%, by MgO up to 5% and Nb 2 O 5 can be replaced by Ta 2 O 5 up to 10 weight %, and wherein K 2 O can be replaced by Na 2 O or Li 2 O by up to 2 weight %.
Claim 3
Dependent Claim
102 words
Optical glass according to claim 1, which consists essentially of: ______________________________________
SiO.sub.2 16.3 weight %
B.sub.2 O.sub.3
25.8 weight %
K.sub.2 O 20.6 weight %
BaO 9.8 weight %
ZrO.sub.2 14.0 weight %
TiO.sub.2 8.8 weight %
Nb.sub.2 O.sub.5
4.7 weight %
F 12.0 weight %
______________________________________ said glass having the following properties: ______________________________________
n.sub.e = 1.5884
v.sub.e = 39.90
specific
gravity s = 2,895
α × 10.sup.7 /° C.
= 113
-30 to 70° C.
Tg° C. = 392
##STR11## = -6.6
Ge.sub.abs × 10.sup.6 /° C.
= 0
modulus of elasticity
[kp/mm.sup.2 ] = 5343
Poisson's ratio = 0.269.
______________________________________
Claim 4
Dependent Claim
93 words
Optical glass according to claim 1, which glass consists essentially of: ______________________________________
SiO.sub.2 16.3 weight %
B.sub.2 O.sub.3
25.8 weight %
K.sub.2 O 20.6 weight %
BaO 9.8 weight %
ZrO.sub.2 4.0 weight %
TiO.sub.2 8.8 weight %
Nb.sub.2 O.sub.5
14.7 weight %
F 12.0 weight%
______________________________________ said glass having the following properties: ______________________________________
n.sub.e = 1.61450
v.sub.e = 36.31
α × 10.sup.7 /° C.
= 110.7
-30 to 70° C.
Tg° C. = 448
##STR12## = -6.7
Ge.sub.abs × 10.sup.6 /° C.
= +0.1
modulus of elasticity
[kp/mm.sup.2 ] = 5708.
______________________________________
Claim 5
Dependent Claim
90 words
Optical glass according to claim 1, which glass consists essentially of: ______________________________________
SiO.sub.2 16.3 weight %
B.sub.2 O.sub.3
25.8 weight %
K.sub.2 O 20.6 weight %
BaO 14.8 weight %
ZrO.sub.2 9.0 weight %
TiO.sub.2 8.8 weight %
Nb.sub.2 O.sub.5
4.7 weight %
F 12.0 weight %
______________________________________ and which has the following properties: ______________________________________
n.sub.e = 1.61527
v.sub.e = 39.85
s = 2.983
α × 10.sup.7 /° C.
= 100.2
-30 to 70° C.
Tg° C. = 434
##STR13## = -4.2
Ge.sub.abs × 10.sup.6 /° C.
= +2.0.
______________________________________
Claim 6
Dependent Claim
83 words
Optical glass according to claim 1, which glass consists essentially of: ______________________________________
SiO.sub.2 12.3 weight %
B.sub.2 O.sub.3
29.8 weight %
K.sub.2 O 20.6 weight %
BaO 19.8 weight %
ZrO.sub.2 4.0 weight %
TiO.sub.2 8.8 weight %
Nb.sub.2 O.sub.5
4.7 weight %
F 5.0 weight %
______________________________________ and which has the following properties: ______________________________________
n.sub.e = 1.60653
v.sub.e = 42.60
α × 10.sup.7 /° C.
= 103.3
-30 to 70° C.
##STR14## = -5
Ge.sub.abs × 10.sup.6 /° C.
= +1.2.
______________________________________
Claim 7
Dependent Claim
21 words
Optical glass according to claim 1 stable to crystallization and having a Ge value above +0.5 × 10 6 /° C.
Claim 8
Dependent Claim
35 words
Optical glass according to claim 1 having a sufficiently high percentage of B 2 O 3 replacing SiO 2 and/or the inclusion of Al 2 O 3 to yield a Ge value less than 0.
Claim 9
Dependent Claim
12 words
Optical glass according to claim 7 containing Al 2 O 3 .
Claim 10
Dependent Claim
13 words
Optical glass according to claim 7 containing none of SrO, CaO or MgO.
Claim 11
Dependent Claim
16 words
Optical glass according to claim 7 containing none of Li 2 O or Na 2 O.
Claim 12
Dependent Claim
49 words
Optical glass according to claim 7 containing none of P 2 O 5 , ZnO, PbO, Al 2 O 3 , La 2 O 3 , Bi 2 O 3 , Sb 2 O 3 , WO 3 , Y 2 O 3 or Ta 2 O 5 .
References Cited (Backward Citations)
US3100714A
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US3266916A
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US3536504A
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US3513004A
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US3716385A
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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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |