Patent US1413995A successfully refreshed from Google Patents.
Patent US3889146A successfully refreshed from Google Patents.
US3889146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun assemblies for use in colour picture tubes
Assignee: Hitachi Ltd
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Filing: 1974-03-06
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Granted: 1975-06-10
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Expires: 1994-03-06
Abstract
Abstract In an electron gun assembly for use in a colour picture tube wherein three electron guns are disposed in a regular triangular configuration, among a plurality of grid electrodes of the three electron guns those performing the same function for the electron beams are integrated into a single hollow cylindrical grid electrode and three electron beam transmission perforations arranged in a regular triangle are provided for one end wall of the hollow cylindrical grid electrode.
Inventors
- 👤 Kihachiro Koizumi
- 👤 Yukihiro Izumida
- 👤 Yoshihiko Miyata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/506
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A delta type electron gun assembly for use in a colour picture tube comprising cathode electrodes arranged in a regular triangular configuration, first grid electrodes disposed in front of said cathode electrodes respectively, second grid electrodes disposed in front of said first grid electrodes respectively, a third hollow cylindrical grid electrode disposed to confront said second grid electrodes and extending substantially coaxially with said tube in the direction of travel of the electron beams emitted by said cathode electrodes, said third grid electrode being provided with three electron beam transmission perforations through one end wall far from said cathode electrodes thereof, said three perforations being also arranged in a regular triangular configuration, a fourth cylindrical grid electrode disposed in front of said third grid electrode, said fourth grid electrode being also provided with three electron beam transmission perforations arranged in a regular triangular configuration through a wall facing to said one end wall thereof, said third and fourth cylindrical grid electrodes comprising members for forming a main electron lens by applying different potential thereon, and means for supporting said cathode electrodes and said grid electrodes.
Claim 2
Dependent Claim
185 words
A delta type electron gun assembly for use in a colour picture tube comprising cathode electrodes arranged in a regular triangular configuration, first grid electrodes disposed in front of said cathode electrodes respectively, second grid electrodes disposed in front of said first grid electrodes respectively, a third hollow cylindrical grid electrode disposed to confront said second grid electrodes and extending substantially coaxially with said tube in the direction of travel of the electron beams emitted by said cathode electrodes, said third grid electrode being provided with three electron beam transmission perforations through one end wall far from said cathode electrodes thereof, said three perforations being also arranged in a regular triangular configuration, a fourth cylindrical grid electrode disposed in front of said third grid electrode, said fourth grid electrode being also provided with three electron beam transmission perforations arranged in a regular triangular configuration through a wall facing to said one end wall thereof, said third and fourth cylindrical grid electrodes comprising members for forming a main electron lens by applying different potential thereon, and means for supporting said cathode electrodes and said grid electrodes.
Claim 3
Dependent Claim
21 words
The electron gun assembly according to claim 1 wherein said third hollow cylindrical grid electrode has substantially regular triangular cross-sectional configuration.
Claim 4
Dependent Claim
63 words
The electron gun assembly according to claim 1 wherein said electron beam transmission perforations through said one end wall of said third grid electrode are circular and are dimensioned to satisfy a relation D/S0 > or = 1.45, where D represents the inside diameter of said perforations and S0 the distance between the centers of said perforations and the axis of said tube.
Claim 5
Dependent Claim
37 words
The electron gun assembly according to claim 1 wherein each of said perforations through said one end wall of said third grid electrode is provided with an inwardly and axially curved periphery extending toward said cathode electrodes.
Claim 6
Dependent Claim
52 words
The electron gun assembly according to claim 1 wherein said third hollow cylindrical grid is provided with three perforated cylindrical projections on the end wall on the side opposite to said one end wall, and said three projections are also arranged in a regular triangular configuration corresponding to said electron transmission perforations.
Claim 7
Dependent Claim
33 words
The electron gun assembly according to claim 1 wherein said electron beam transmission perforations of the fourth control grid electrode are displaced outwardly with respect to those of the third control grid electrode.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |