US3866080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams
Assignee: RCA Licensing Corp
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Filing: 1973-08-08
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Granted: 1975-02-11
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Expires: 1993-08-08
Abstract
Abstract The cathode ray tube electron gun has means for generating and directing a plurality of electron beams along substantially coplanar paths. Two sets of magnetic plates provide independent enhancement of magnetic fields for deflecting the beams perpendicularly to the plane of the paths and in the plane of the paths. Plates in the first set are located between each of the paths and outwardly of the outermost paths. Plates in the second set are in pairs, each pair having one plate on each side of a beam perpendicular to the plane of the beams.
Inventors
- 👤 William Henry Barkow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:31
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/707
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
In an inline electron gun for a cathode ray tube including means for generating and directing three electron beams along substantially coplanar paths, the improvement comprising: four first magnetically permeable plates coplanar with said electron beams and with each other being located at a beam exit from said gun between each of said paths and outwardly of the outermost paths for independently enhancing a magnetic field for deflecting said beams perpendicularly to the plane of said paths; and six second magnetically permeable plates all perpendicular to the plane of said beams being located at a beam exit from said gun, arranged in parallel pairs, the plates of ech pair being coplanar to each other and each pair having one plate on each side of a beam for independently enhancing another magnetic field for deflecting said beams within the plane of said beams.
Claim 2
Dependent Claim
142 words
In an inline electron gun for a cathode ray tube including means for generating and directing three electron beams along substantially coplanar paths, the improvement comprising: four first magnetically permeable plates coplanar with said electron beams and with each other being located at a beam exit from said gun between each of said paths and outwardly of the outermost paths for independently enhancing a magnetic field for deflecting said beams perpendicularly to the plane of said paths; and six second magnetically permeable plates all perpendicular to the plane of said beams being located at a beam exit from said gun, arranged in parallel pairs, the plates of ech pair being coplanar to each other and each pair having one plate on each side of a beam for independently enhancing another magnetic field for deflecting said beams within the plane of said beams.
References Cited (Backward Citations)
US2939979A
Cited
US3363128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |