US4472030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cesium-containing optical glass
Assignee: Nippon Sheet Glass Co Ltd
•
Filing: 1983-11-04
•
Granted: 1984-09-18
•
Expires: 2003-11-04
Abstract
Abstract A cesium-containing optical glass comprising, by weight, 32-56% of SiO 2 , 6-25% of K 2 O, 6-32% of Cs 2 O, 0-30% of BaO, 0-2.5% of MgO, 5-34% of ZnO, 0-3% of ZrO 2 and 0-5% of SnO 2 , provided that the total proportion of BaO, MgO and ZnO is 8-40% and the total proportion of ZrO 2 and SnO 2 is 0.2-6%. When this cesium-containing optical glass is treated in a molten bath containing potassium nitrate, the cesium ion in the glass is easily exchanged with a potassium ion and therefore, the cesium ion concentration gradually decreases radially outwardly from the central axis and the potassium ion concentration gradually increases in that direction. Thus, there is obtained a light converge-type lens in which the refractive index gradually decreases in the same direction.
Inventors
- 👤 Masakiyo Tachibana
- 👤 Yukio Noguchi
- 👤 Noboru Akazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:53
CPC Classifications
C; C03; C03C; C03C21/00; C03C21/001; C03C21/002; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/078; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A cesium-containing optical glass consisting essentially of SiO 2 , K 2 O, Cs 2 O, ZnO, at least one compound selected from the group consisting of ZrO 2 and SnO 2 , and optionally at least one additional component selected from the group consisting of BaO, GeO 2 , La 2 O 3 , Sb 2 O 3 , Bi 2 O 3 , Al 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, CaO, MgO, SrO, PbO, B 2 O 3 and As 2 O 3 in the following proportions in percent by weight: ______________________________________
SiO.sub.2 32-56
K.sub.2 O 6-25
Cs.sub.2 O 6-32
ZnO 5-34
ZrO.sub.2 0-3
SnO.sub.2 0-5
BaO 0-30
GeO.sub.2 0-25
La.sub.2 O.sub.3
0-2
Sb.sub.2 O.sub.3
0-2
Bi.sub.2 O.sub.3
0-14
Al.sub.2 O.sub.3
0-6
Ta.sub.2 O.sub.5
0-8
Li.sub.2 O 0-2.5
Na.sub.2 O 0-4.5
CaO 0-2.5
MgO 0-2.5
SrO 0-2.5
PbO 0-2.5
B.sub.2 O.sub.3
0-2
As.sub.2 O.sub.3
0-1
______________________________________ provided that BaO+MgO+ZnO=8-40, ZrO 2 +SnO 2 =0.2-6, Li 2 O+Na 2 O=0-7 and CaO+SrO+PbO=0-2.5.
Claim 2
Dependent Claim
172 words
A cesium-containing optical glass consisting essentially of SiO 2 , K 2 O, Cs 2 O, ZnO, at least one compound selected from the group consisting of ZrO 2 and SnO 2 , and optionally at least one additional component selected from the group consisting of BaO, GeO 2 , La 2 O 3 , Sb 2 O 3 , Bi 2 O 3 , Al 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, CaO, MgO, SrO, PbO, B 2 O 3 and As 2 O 3 in the following proportions in percent by weight: ______________________________________
SiO.sub.2 32-56
K.sub.2 O 6-25
Cs.sub.2 O 6-32
ZnO 5-34
ZrO.sub.2 0-3
SnO.sub.2 0-5
BaO 0-30
GeO.sub.2 0-25
La.sub.2 O.sub.3
0-2
Sb.sub.2 O.sub.3
0-2
Bi.sub.2 O.sub.3
0-14
Al.sub.2 O.sub.3
0-6
Ta.sub.2 O.sub.5
0-8
Li.sub.2 O 0-2.5
Na.sub.2 O 0-4.5
CaO 0-2.5
MgO 0-2.5
SrO 0-2.5
PbO 0-2.5
B.sub.2 O.sub.3
0-2
As.sub.2 O.sub.3
0-1
______________________________________ provided that BaO+MgO+ZnO=8-40, ZrO 2 +SnO 2 =0.2-6, Li 2 O+Na 2 O=0-7 and CaO+SrO+PbO=0-2.5.
Claim 3
Dependent Claim
77 words
A cesium-containing optical glass of claim 1, wherein said additional component is selected from the group consisting of BaO, GeO 2 , La 2 O 3 , Sb 2 O 3 , Bi 2 O 3 , Al 2 O 3 , Ta 2 O 5 , Li 2 O, Na 2 O, CaO, MgO, PbO 2 and B 2 O 3 , and said additional components is present in percent by weight defined in claim 1.
Claim 4
Dependent Claim
46 words
A light converging-type lens containing cesium in a gradually decreasing concentration outwardly from its central axis and potassium in a gradually increasing concentration in that direction, which is prepared by treating the cesium-containing optical glass of claim 1 in a molten salt bath containing potassium nitrate.
Claim 5
Dependent Claim
46 words
A light converging-type lens containing cesium in a gradually decreasing concentration outwardly from its central axis and potassium in a gradually increasing concentration in that direction, which is prepared by treating the cesium-containing optical glass of claim 2 in a molten salt bath containing potassium nitrate.
References Cited (Backward Citations)
FR1507834A
Cited
US3843228A
Cited
US3827785A
Cited
JPS5087106A
Cited
DE2457085A1
Cited
US4367012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |