Patent US3603839A successfully refreshed from Google Patents.
US3603839A
Expired / Lapsed
US
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Color television picture tube of the single electron gun type
Assignee: Victor Company of Japan Ltd
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Filing: 1969-06-02
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Granted: 1971-09-07
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Expires: 1989-06-02
Abstract
Abstract A color television picture tube comprises a single electron gun including a plurality of cathodes arranged in a parallel relationship. A control grid is disposed near the cathodes and formed with a plurality of vertically oriented elongated slits. Each slit is disposed in a position corresponding to the positions of said cathodes. The electron beams, emitted from the electron gun, cross over and focus on a shadow mask. A postdeflection focusing of the electron beams forms an image on a phosphorescent screen. A plurality of phosphor dots on the television tube are arranged on positions in which the images are formed.
Inventors
- 👤 Kenjiro Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:29
CPC Classifications
B; B82; B82Y; B82Y10/00; H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/203; H01J31/206; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A color television picture tube comprising a single electron gun including a plurality of cathodes arranged in one plane and parallel to one another for emitting electron beams, a control grid formed with a plurality of vertically elongated slits disposed in positions corresponding to the positions of said cathodes, at least one anode, and a cascaded series of cylindrical electrodes; a phosphorescent screen consisting of a plurality of colored dots; and apertured shadow-mask interposed between said electron gun and said phosphorescent screen; first electron focusing means for converging the electron beams emanating from said cathodes to a crossover point and focusing images of the electron beams of the faces of said slits in said cylindrical electrodes; second electron focusing means for focusing said crossover point on said shadow-mask; and third electron focusing means for reforming the images of electron beams focused in said cylindrical electrodes on said phosphorescent screen, said plurality of dots being coated with different color phosphors on the positions of the reformed images corresponding to each of said slits of the control grid.
Claim 2
Dependent Claim
176 words
A color television picture tube comprising a single electron gun including a plurality of cathodes arranged in one plane and parallel to one another for emitting electron beams, a control grid formed with a plurality of vertically elongated slits disposed in positions corresponding to the positions of said cathodes, at least one anode, and a cascaded series of cylindrical electrodes; a phosphorescent screen consisting of a plurality of colored dots; and apertured shadow-mask interposed between said electron gun and said phosphorescent screen; first electron focusing means for converging the electron beams emanating from said cathodes to a crossover point and focusing images of the electron beams of the faces of said slits in said cylindrical electrodes; second electron focusing means for focusing said crossover point on said shadow-mask; and third electron focusing means for reforming the images of electron beams focused in said cylindrical electrodes on said phosphorescent screen, said plurality of dots being coated with different color phosphors on the positions of the reformed images corresponding to each of said slits of the control grid.
Claim 3
Dependent Claim
65 words
A color television picture tube as defined in claim 1 in which said first electron focusing means includes means for controlling a voltage applied to said at least one anode; in which said second electron focusing means includes means for controlling voltages applied to said cylindrical electrodes; and in which said third electron focusing means includes means for controlling a voltage applied to said shadow-mask.
Claim 4
Dependent Claim
104 words
A color television picture tube as defined in claim 1 in which said plurality of cathodes are three in number; in which said control grid is formed with three vertically oriented elongated slits corresponding to three primary colors arranged in side-by-side relation and juxtaposed to the electron-emanating faces of said cathodes respectively, the slit for green color being disposed in the center to be flanked by the slits for red and blue colors; and in which said plurality of dots are coated with three primary color phosphors on the positions of the reformed images corresponding to each of said slits of the control grid.
Claim 5
Dependent Claim
26 words
A color television picture tube as defined in claim 3 in which said slit for green color has a longer vertical length than the other slits.
References Cited (Backward Citations)
US2957106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |