US3579010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elongated aperture electron gun structure for flat cathode-ray tube
Assignee: Lanteris Space LLC
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Filing: 1968-10-31
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Granted: 1971-05-18
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Expires: 1988-10-31
Abstract
Abstract An electron gun for a flat cathode-ray tube wherein the control electrode and the screen electrode of the gun each have an elliptical aperture therein, and a flat cathode-ray tube employing such a gun. The major axes of the two elliptical apertures lie in a common plane which is oriented with respect to the faceplate of the tube so that an electron beam emitted by the cathode of the gun produces a substantially circular spot on said faceplate.
Inventors
- 👤 Robert C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:34
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/488; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/124
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
In a cathode-ray tube comprising an electron-beam-responsive screen, means for projecting a beam of electrons thereagainst, and electron beam accelerating-focusing apparatus, said means comprising an electron-emissive cathode, a control electrode and a screen electrode, said tube having a center of deflection for said beam, said beam-responsive screen being oriented at an angle acute with respect to a line connecting said deflection center and the center of said screen, the improvement comprising an elliptical aperture in said control electrode and an elliptical aperture in said screen electrode, the major axes of both said apertures lying in a common plane.
Claim 2
Dependent Claim
98 words
In a cathode-ray tube comprising an electron-beam-responsive screen, means for projecting a beam of electrons thereagainst, and electron beam accelerating-focusing apparatus, said means comprising an electron-emissive cathode, a control electrode and a screen electrode, said tube having a center of deflection for said beam, said beam-responsive screen being oriented at an angle acute with respect to a line connecting said deflection center and the center of said screen, the improvement comprising an elliptical aperture in said control electrode and an elliptical aperture in said screen electrode, the major axes of both said apertures lying in a common plane.
Claim 3
Dependent Claim
10 words
The tube of claim 1 wherein said apertures are coaxial.
Claim 4
Dependent Claim
48 words
The tube of claim 2 wherein said apertures are oriented so that said common plane intersects said screen in a direction transverse to the direction in which a spot would be elongated if produced on said screen by a beam of circular cross section projected along said line.
Claim 5
Dependent Claim
17 words
The tube of claim 3 wherein said direction of intersection is perpendicular to said direction of elongation.
Claim 6
Dependent Claim
27 words
The tube of claim 4 wherein said aperture in each of said control electrode and said screen electrode has an axial ratio of between 1.3 and 2.5.
Claim 7
Dependent Claim
42 words
An electron gun comprising an electron-emissive cathode, a control electrode and a screen electrode, the improvement comprising an elliptical aperture in said control electrode and an elliptical aperture in said screen electrode, said elliptical apertures being coaxial and having coplanar major axes.
Claim 8
Dependent Claim
42 words
An electron gun comprising an electron-emissive cathode, a control electrode and a screen electrode, the improvement comprising an elliptical aperture in said control electrode and an elliptical aperture in said screen electrode, said elliptical apertures being coaxial and having coplanar major axes.
Claim 9
Dependent Claim
20 words
The electron gun of claim 6 wherein each of said apertures has an axial ratio of between 1.3 and 2.5.
Claim 10
Dependent Claim
99 words
In a cathode ray tube comprising an electron-beam-responsive screen, means for projecting a beam of electrons thereagainst, and electron beam accelerating-focusing apparatus, said means comprising an electron-emissive cathode, a control electrode and a screen electrode, said tube having a center of deflection for said beam, said beam-responsive screen being oriented at an angle acute with respect to a line connecting said deflection center and the center of said screen, the improvement comprising an elongated aperture in said control electrode and an elongaTed aperture in said screen electrode, the major axes of both said apertures lying in a common plane.
Claim 11
Dependent Claim
99 words
In a cathode ray tube comprising an electron-beam-responsive screen, means for projecting a beam of electrons thereagainst, and electron beam accelerating-focusing apparatus, said means comprising an electron-emissive cathode, a control electrode and a screen electrode, said tube having a center of deflection for said beam, said beam-responsive screen being oriented at an angle acute with respect to a line connecting said deflection center and the center of said screen, the improvement comprising an elongated aperture in said control electrode and an elongaTed aperture in said screen electrode, the major axes of both said apertures lying in a common plane.
Claim 12
Dependent Claim
42 words
An electron gun comprising an electron-emissive cathode, a control electrode and a screen electrode, the improvement comprising an elongated aperture in said control electrode and an elongated aperture in said screen electrode, said elongated apertures being coaxial and having coplanar major axes.
Claim 13
Dependent Claim
42 words
An electron gun comprising an electron-emissive cathode, a control electrode and a screen electrode, the improvement comprising an elongated aperture in said control electrode and an elongated aperture in said screen electrode, said elongated apertures being coaxial and having coplanar major axes.
References Cited (Backward Citations)
US2836752A
Cited
US2884559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |