US4926090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television picture tube having a composite frontal pane
Assignee: Flabeg GmbH and Co KG
•
Filing: 1987-12-12
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Granted: 1990-05-15
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Expires: 2007-12-12
Abstract
Abstract A television picture tube which includes a composite frontal plane comprising a viewing screen which is spherically or aspherically convexly curved relative to the viewer. A convexly curved supplementary plane, preferably made of clear glass, gray glass or machine glass is spaced from the viewing screen by a transparent cast resin layer inserted between the viewing screen and the supplementary pane. The resin layer glues the screen and the pane to one another and has a refraction index which corresponds approximately to that of the supplementary pane and the viewing screen. The supplementary pane is cylindrically curved only about the panes vertical axis and its radius of curvature is significantly larger than the radius of curvature of the viewing screen.
Inventors
- 👤 Wilhelm Rein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:36
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H04; H04N; H04N9/00; H04N9/12; H04N9/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A television picture tube including a composite frontal pane comprising: a viewing screen which is spherically or aspherically convexly curved relative to a viewer thereof; a convexly curved light-transparent supplementary pane spaced from said viewing screen; and a transparent cast resin layer inserted between said viewing screen and said supplementary pane for gluing said screen and said pane to one another, said cast resin layer having a refraction index which corresponds approximately to that of said supplementary pane and said viewing screen, wherein said supplementary pane is cylindrically curved only about the vertical axis of said pane and the radius of curvature of said pane is significantly larger than the radius of curvature of said viewing screen.
Claim 2
Dependent Claim
117 words
A television picture tube including a composite frontal pane comprising: a viewing screen which is spherically or aspherically convexly curved relative to a viewer thereof; a convexly curved light-transparent supplementary pane spaced from said viewing screen; and a transparent cast resin layer inserted between said viewing screen and said supplementary pane for gluing said screen and said pane to one another, said cast resin layer having a refraction index which corresponds approximately to that of said supplementary pane and said viewing screen, wherein said supplementary pane is cylindrically curved only about the vertical axis of said pane and the radius of curvature of said pane is significantly larger than the radius of curvature of said viewing screen.
Claim 3
Dependent Claim
29 words
The television picture tube according to claim 1, wherein the ratio of the radii of curvature of the viewing screen and the supplementary pane lies between 1:1.2 and 1:3.5.
Claim 4
Dependent Claim
29 words
The television picture tube according to claim 2, wherein the ratio of the radii of curvature of the viewing screen and the supplementary pane lies between 1:1.8 and 1:2.3.
Claim 5
Dependent Claim
31 words
The television picture tube according to claim 1, wherein said supplementary pane has a frontal face which is made non-reflective by the application of a single or multiple layer interference coating.
Claim 6
Dependent Claim
20 words
The television picture tube according to claim 1, wherein said supplementary pane has a frontal face with a matte finish.
Claim 7
Dependent Claim
25 words
The television picture tube according to claim 1, wherein said supplementary pane has a back provided with an electrically conductive, anti-statically acting and grounded coating.
Claim 8
Dependent Claim
53 words
The television picture tube according to claim 6, wherein said coating on the back of said supplementary pane is a material selected from the group consisting of metals, metal alloys and metal compounds and has such a thickness that its light transmittance is reduced by about one third compared to the uncoated pane.
Claim 9
Dependent Claim
25 words
The television picture tube according to claim 7, wherein said coating is a material selected from the group consisting of chromium, high-grade steel and silicides.
Claim 10
Dependent Claim
32 words
The television picture tube according to claim 1, wherein said convexly curved supplementary pane is made of a material selected from the group consisting of clear glass, gray glass or machine-gray glass.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |