US3857057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour television display apparatus provided with a picture display tube with electron beams generated in one plane
Assignee: US Philips Corp
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Filing: 1972-12-15
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Granted: 1974-12-24
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Expires: 1992-12-15
Abstract
Abstract Colour television display apparatus provided with a display tube with electron beams generated in one plane. In order to enlarge the colour selection angle without the necessity of thickening the neck, a statically energized magnetic quadripolar field is generated at the area of the deflection plane while there is no point of intersection of the beams located within the display tube in the absence of this quadripolar field. This is ensured by four extra windings on the core of the deflection coil system, or by the deflection coils themselves if they are toroidally wound, or by four permanent magnets. The beams may be generated in a diverging manner in the display tube.
Inventors
- 👤 P Barten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/703
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
Colour television display apparatus provided with a picture display tube having a display screen, and with a system of deflection coils comprising a magnetic core for deflecting electron beams into two substantially orthogonal directions, which beams are generated substantially in one plane in the tube, characterized in that the landing spots of the electron beams on the display screen are registered by a statically energized magnetic quadripolar field generated at the area of the deflection plane, while there is no point of intersection of the beams located within the display tube in the absence of said quadripolar field.
Claim 2
Dependent Claim
98 words
Colour television display apparatus provided with a picture display tube having a display screen, and with a system of deflection coils comprising a magnetic core for deflecting electron beams into two substantially orthogonal directions, which beams are generated substantially in one plane in the tube, characterized in that the landing spots of the electron beams on the display screen are registered by a statically energized magnetic quadripolar field generated at the area of the deflection plane, while there is no point of intersection of the beams located within the display tube in the absence of said quadripolar field.
Claim 3
Dependent Claim
42 words
Television display apparatus as claimed in claim 1, characterized in that the quadripolar field is generated by four extra windings toroidally wound on the core at the area where the deflection directions cross the core and through which a direct current flows.
Claim 4
Dependent Claim
43 words
Television display apparatus as claimed in claim 1, characterized in that the quadripolar field is generated by the deflection coils which are toroidally wound on the core, each coil being split up into two halves and a direct current flowing through each coil.
Claim 5
Dependent Claim
49 words
Television display apparatus as cliamed in claim 1, characterized in that the quadripolar field is generated by four permanent magnets having pole shoes and being provided on the inner side of the core at the area where the deflection directions cross the core and whose magnetisation is tangentially directed.
Claim 6
Dependent Claim
41 words
Television display apparatus as claimed in claim 1, characterized in that the quadripolar field is generated by four extra windings which are wound on the core as saddle coils in directions which are shifted approximately 45* relative to the deflection directions.
Claim 7
Dependent Claim
58 words
Television display apparatus as claimed in claim 1, characterized in that the quadripolar field is generated by four permanent magnets having pole shoes and being provided on the inner side of the core at the area where the directions which are shifted approximately 45* relative to the deflection direction cross the core and whose magnetisation is radially directed.
Claim 8
Dependent Claim
20 words
Television display apparatus as claimed in claim 1, characterized in that the electron beams are generated in a diverging manner.
Claim 9
Dependent Claim
63 words
Television display apparatus as claimed in claim 1, further comprising corrector means for adjusting the direction of the electron beams disposed on the neck of said display tube between the electron beam generating device and said deflection coil system and characterized in that the mutual distance between the electron beams is larger in the deflection plane than at the area of the corrector.
Claim 10
Dependent Claim
39 words
An apparatus as claimed in claim 1 comprising a magnetic core on which deflection coils are wound, characterized in that four extra windings are toroidally wound on the core at the area where the deflection directions cross the core.
Claim 11
Dependent Claim
51 words
An apparatus as claimed in claim 1 comprising a magnetic core on which deflection coils are wound, characterized in that four permanent magnets having pole shoes are provided on the inner side of the core at the area where the deflection directions cross the core and whose magnetisation is tangentially directed.
Claim 12
Dependent Claim
43 words
An apparatus as claimed in claim 1 comprising a magnetic core on which deflection coils are wound, characterized in that four extra windings are wound as saddle coils on the core in directions which are shifted approximately 45* relative to the deflection direction.
Claim 13
Dependent Claim
59 words
An apparatus as claimed in claim 1 comprising a magnetic core on which deflection coils are wound, characterized in that four permanent magnets having pole shoes are provided on the inner side of the core at the area where directions which are shifted approximately 45* relative to the deflection directions cross the core and whose magnetisation is radially directed.
Claim 14
Dependent Claim
35 words
A device as claimed in claim 1 further comprising means disposed on the neck of said tube between the electron beam generating device and said magnetic core for adjusting the direction of said electron beams.
Claim 15
Independent Claim
87 words
A device for a display tube having a gun for generating a plurality of coplanar electron beams having no intersection point within said tube, said device comprising means disposed on said tube for deflecting said beams substantially at an effective deflection plane, and convergence means disposed on said tube for generating at least a static quadripolar magnetic field substantially at said deflection plane for converging said beams within said tube, whereby a large color selection angle results, thereby minimizing the susceptibility of said beams to interfering fields.
Claim 16
Independent Claim
87 words
A device for a display tube having a gun for generating a plurality of coplanar electron beams having no intersection point within said tube, said device comprising means disposed on said tube for deflecting said beams substantially at an effective deflection plane, and convergence means disposed on said tube for generating at least a static quadripolar magnetic field substantially at said deflection plane for converging said beams within said tube, whereby a large color selection angle results, thereby minimizing the susceptibility of said beams to interfering fields.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |