US4476233A
Expired / Lapsed
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Phosphate optical glass
Assignee: Nikon Corp
•
Filing: 1983-09-12
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Granted: 1984-10-09
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Expires: 2003-09-12
Abstract
Abstract A phosphate optical glass comprises P 2 O 5 of 40-55 weight percents, R 2 O of 20-40 weight percents (wherein R is an alkali metal or a mixture of alkali metals selected from the group consisting of Li, Na and K), TiO 2 of 8-20 weight percents, WO 3 of 1-12 weight percents (providing that the WO 3 content be less than TiO 2 ), As 2 O 3 of 0.1-4 weight percents, MgO of 0-7, CaO of 0-11, BaO of 0-12, ZnO of 0-12 PbO of 0-18, Nb 2 O 5 of 0-20, Ta 2 O 5 of 0-10, SiO 2 of 0-3, ZrO 2 of 0-3, La 2 O 3 of 0-3, Y 2 O 3 of 0-3 and F of 0-5.
Inventors
- 👤 Hiroyuki Kodama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:50
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/21; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A phosphate optical glass having the optical constants lying in the area defined and enclosed by the seven points, A, B, C, D, E, F and G as shown in the accompanying drawing and consisting essentially of, by weight percent, ______________________________________
40-55 P.sub.2 O.sub.5,
20-40 R.sub.2 O,
(wherein R is Li, Na or K)
8-20 TiO.sub.2,
1--12 WO.sub.3,
(providing that the percentage of WO.sub.3
be not larger than TiO.sub.2)
0.1-4 As.sub.2 O.sub.3,
0-7 MgO,
0-11 CaO,
0-12 BaO,
0-12 ZnO,
0-18 PbO,
0-20 Nb.sub.2 O.sub.5,
0-10 Ta.sub.2 O.sub.5,
0-3 SiO.sub.2,
0-3 ZrO.sub.2,
0-3 La.sub.2 O.sub.3,
0-3 Y.sub.2 O.sub.3 and
0-5 F.
______________________________________
Claim 2
Dependent Claim
102 words
A phosphate optical glass having the optical constants lying in the area defined and enclosed by the seven points, A, B, C, D, E, F and G as shown in the accompanying drawing and consisting essentially of, by weight percent, ______________________________________
40-55 P.sub.2 O.sub.5,
20-40 R.sub.2 O,
(wherein R is Li, Na or K)
8-20 TiO.sub.2,
1--12 WO.sub.3,
(providing that the percentage of WO.sub.3
be not larger than TiO.sub.2)
0.1-4 As.sub.2 O.sub.3,
0-7 MgO,
0-11 CaO,
0-12 BaO,
0-12 ZnO,
0-18 PbO,
0-20 Nb.sub.2 O.sub.5,
0-10 Ta.sub.2 O.sub.5,
0-3 SiO.sub.2,
0-3 ZrO.sub.2,
0-3 La.sub.2 O.sub.3,
0-3 Y.sub.2 O.sub.3 and
0-5 F.
______________________________________
Claim 3
Dependent Claim
70 words
A phosphate optical glass according to claim 1, which consisting essentially of, by weight percent, ______________________________________
40-55 P.sub.2 O.sub.5,
20-40 R.sub.2 O,
8-17 TiO.sub.2,
1-12 WO.sub.3,
(providing that the percentage of WO.sub.3
be not larger than TiO.sub.2),
0.1-2 As.sub.2 O.sub.3,
0-5 MgO,
0-8 CaO,
0-9 BaO,
0-9 ZnO,
0-9 PbO,
0-9 Nb.sub.2 O.sub.5,
0-5 Ta.sub.2 O.sub.5,
0-3 SiO.sub.2,
0-3 ZrO.sub.2,
0-3 La.sub.2 O.sub.3,
0-3 Y.sub.2 O.sub.3 and
0-5 F.
______________________________________
Claim 4
Dependent Claim
70 words
A phosphate optical glass according to claim 1, which consisting essentially of, by weight percent, ______________________________________
40-55 P.sub.2 O.sub.5,
20-40 R.sub.2 O,
10.5-17 TiO.sub.2,
4-12 WO.sub.3,
(providing that the percentage of WO.sub.3
be not larger than TiO.sub.2)
0.1-2 As.sub.2 O.sub.3,
0-4 MgO,
0-6 CaO,
0-9 BaO,
0-9 ZnO,
0-9 PbO,
0-9 Nb.sub.2 O.sub.5,
0-5 Ta.sub.2 O.sub.5,
0-2 SiO.sub.2,
0-2 ZrO.sub.2,
0-2 La.sub.2 O.sub.3,
0-2 Y.sub.2 O.sub.3 and
0-2 F.
______________________________________
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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