Patent US3859103A successfully refreshed from Google Patents.
US3859103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical glass body having a refractive index gradient
Assignee: Nippon Selfoc Co Ltd
•
Filing: 1973-03-08
•
Granted: 1975-01-07
•
Expires: 1993-03-08
Abstract
Abstract An optical glass body comprising at its central axis 50 to 70 mol % of SiO2, 10 to 30 mol % of B2O, 1 to 25 mol % of Tl2O and R2O, the total proportion of Tl2O and R2O being 10 to 30 mol %, the concentration of the thallium ions contained in said glass body gradually decreasing from its central axis to its peripheral surface, with the consequence that the refractive index of the glass body continuously decreases from the central axis of the glass body to its peripheral surface, wherein R is at least one component of the group consisting of the alkali metals.
Inventors
- 👤 Mitsugi Yoshiyagawa
- 👤 Yoshiro Ikeda
- 👤 Kohichi Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:34
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C21/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
172 words
AN OPTICAL GLASS BODY SELECTED FROM RODS AND/OR FIBERS COMPRISING AT ITS CENTRAL AXIS 50 TO 70 MOL % OF SIO2, 10 TO 30 MOL % OF B2O3, 1 TO 25 MOL % OF TI2O AND AT LEAST 6.5 MOL % OF R2O, THE TOTAL PROPORTION OF TI2O AND R2O BEING 10 TO 30 MOL %, THE CONCENTRATION OF THE THALLIUM IONS CONTAINED IN SAID GLASS BODY GRADUALLY DECREASING FROM ITS CENTRAL AXIS TO ITS PERIPHERAL SURACE THE CONCENTRATION OF THE COMPONENTS OTHER LTHAN T12O AND R2O BEING EACH MAINTAINED SUBSTANTIALLY CONSTANT IN THE RADIAL DIRECTION IN A CROSS SECTION PERPENDICULAR TO THE CENTRAL AXIS, AND THE TOTAL CONCENTRATION OF T12O+ R2O IN MOL % BEING MAINTAINED SUBSTANTIALLY CONSTANT IN THE RADIAL DIRECTION IN A CROSS SECTION PERPENDICULAR TO THE CENTRAL AXIS, WITH THE CONSEQUENCE THAT THE REFRACTIVE INDEX OF THE GLASS BODY CONTINUOUSLY DECREASES FROM THE CENTRAL AXIS OF THE GLASS BODY TO ITS PERIPHERAL SURFACE, WHEREIN R IS AT LEAST ONE COMPONENT OF THE GROUP CONSISTING OF THE ALKALI METALS.
Claim 2
Dependent Claim
172 words
AN OPTICAL GLASS BODY SELECTED FROM RODS AND/OR FIBERS COMPRISING AT ITS CENTRAL AXIS 50 TO 70 MOL % OF SIO2, 10 TO 30 MOL % OF B2O3, 1 TO 25 MOL % OF TI2O AND AT LEAST 6.5 MOL % OF R2O, THE TOTAL PROPORTION OF TI2O AND R2O BEING 10 TO 30 MOL %, THE CONCENTRATION OF THE THALLIUM IONS CONTAINED IN SAID GLASS BODY GRADUALLY DECREASING FROM ITS CENTRAL AXIS TO ITS PERIPHERAL SURACE THE CONCENTRATION OF THE COMPONENTS OTHER LTHAN T12O AND R2O BEING EACH MAINTAINED SUBSTANTIALLY CONSTANT IN THE RADIAL DIRECTION IN A CROSS SECTION PERPENDICULAR TO THE CENTRAL AXIS, AND THE TOTAL CONCENTRATION OF T12O+ R2O IN MOL % BEING MAINTAINED SUBSTANTIALLY CONSTANT IN THE RADIAL DIRECTION IN A CROSS SECTION PERPENDICULAR TO THE CENTRAL AXIS, WITH THE CONSEQUENCE THAT THE REFRACTIVE INDEX OF THE GLASS BODY CONTINUOUSLY DECREASES FROM THE CENTRAL AXIS OF THE GLASS BODY TO ITS PERIPHERAL SURFACE, WHEREIN R IS AT LEAST ONE COMPONENT OF THE GROUP CONSISTING OF THE ALKALI METALS.
Claim 3
Dependent Claim
33 words
A fiberlike glass body according to claim 1 containing 1.0 -5.5 mol % of Tl2O at the central axis of the glass body, said glass body being suitably used for optical communication purposes.
Claim 4
Dependent Claim
29 words
A glass body according to claim 2 wherein the SiO2 content at the central axis of the glass body is in the range of 50 - 65 mol %.
Claim 5
Dependent Claim
44 words
A glass body according to claim 3 wherein as other ingredients the body contains at its central axis a total of 0 -15 mol % of at least one ingredient selected from the group consisting of MgO, CaO, BaO, ZnO, PbO, Al2O3SnO2 and TiO2.
Claim 6
Dependent Claim
26 words
A glass body according to claim 3 wherein as an additional ingredient the body contains at its central axis 2 - 15 mol % of ZnO.
Claim 7
Dependent Claim
35 words
A glass body according to claim 1 wherein the content of Tl2O at the central axis is in the range of 5.5 - 25 mol %, said glass body being suitably used as a lens.
Claim 8
Dependent Claim
56 words
A glass body according to claim 1 wherein the composition of the glass body at the central axis thereof is 50 - 65 mol % SiO2, 10 - 25 mol % B2O3, 5.5 - 25 mol % Tl2O and 15 - 30 mol % (Tl2O + R2O), said glass body being suitably used as a lens.
Claim 9
Dependent Claim
44 words
A glass body according to claim 7 wherein as other ingredients the body contains at its central axis a total of 1 -20 mol % of at least one ingredient selected from the group consisting of MgO, CaO, BaO, ZnO, PbO, Al2O3SnO2 and TiO2.
Claim 10
Dependent Claim
26 words
A glass body according to claim 7 wherein as an additional ingredient the body contains at its central axis, 2 - 15 mol % of ZnO.
Claim 11
Dependent Claim
93 words
An optical glass body according to claim 1 wherein the concentration of the ions of at least one metal selected from the group consisting of lithium, sodium, potassium, rubidium and cesium gradually increases from the central axis of the body towards the peripheral surface thereof, the refractive index of said body being expressed by the following equation N No (1 -ar2) wherein N is the refractive index at a distance r from the central axis of the body in a cross section perpendicular to the central axis, and a is a positive constant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |