US3668464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection compensation for temperature changes in a color picture tube
Assignee: Sony Corp
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Filing: 1970-02-11
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Granted: 1972-06-06
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Expires: 1990-02-11
Abstract
Abstract In a color picture tube having an apertured beam selecting grill or mask through one or more electron beams are made to land on predetermined color phosphors applied to the face plate of the tube, thermal expansion of the grill or mask is compensated for, so as to avoid mislanding of the beam or beams, by providing an auxiliary magnetic deflection means located in back of the main magnetic deflection or scanning means and operative in dependence on the operation of the main deflection means to produce magnetic flux in opposition thereto. The current flowing in the auxiliary magnetic deflection means is decreased with increasing temperature by means of a thermosensitive magnetic means so as to similarly decrease the magnetic flux opposing that of the main deflection means, whereby the effective center of deflection of the beam or beams is shifted rearwardly in response to increasing temperature.
Inventors
- 👤 Tetsuo Tokita
- 👤 Yuzo Fuse
- 👤 Yoshiharu Katagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:36
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/006; H01J29/46; H01J29/70; H01J29/701; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H01J2229/00; H01J2229/96; H01J2229/964
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
264 words
In a color picture tube including an envelope having a face plate, a screen of phosphors coated on said face plate, an electron gun device for generating at least one electron beam directed toward said face plate, apertured beam selecting means disposed adjacent said face plate to land said beam on selected phosphors of said screen in accordance with the angle of incidence of said beam to said beam selecting means at the apertures of the latter, and main magnetic deflection means for deflecting said beam so as to cause scanning of said screen; the improvement comprising auxiliary magnetic deflection means disposed at the side of said main deflection means remote from said screen, and circuit means connecting said auxiliary magnetic deflection means with said main magnetic deflection means to cause a current flow through said auxiliary deflection means for producing a magnetic flux in opposition to that produced by the main deflection means in response to the supplying of a deflection current to said main deflection means, said circuit means including an element sensitive to the temperature of said tube and having a magnetic core member with a permeability that decreases with increasing temperature and at least one winding wounD on said core member and connected with said auxiliary deflection means to decrease said current flow through the latter with increasing temperature of said tube, whereby said magnetic flux produced by the auxiliary deflection means is similarly decreased and the angle of incidence of the beam to the beam selecting means is changed to compensate for thermal expansion of said beam selecting means.
Claim 2
Dependent Claim
264 words
In a color picture tube including an envelope having a face plate, a screen of phosphors coated on said face plate, an electron gun device for generating at least one electron beam directed toward said face plate, apertured beam selecting means disposed adjacent said face plate to land said beam on selected phosphors of said screen in accordance with the angle of incidence of said beam to said beam selecting means at the apertures of the latter, and main magnetic deflection means for deflecting said beam so as to cause scanning of said screen; the improvement comprising auxiliary magnetic deflection means disposed at the side of said main deflection means remote from said screen, and circuit means connecting said auxiliary magnetic deflection means with said main magnetic deflection means to cause a current flow through said auxiliary deflection means for producing a magnetic flux in opposition to that produced by the main deflection means in response to the supplying of a deflection current to said main deflection means, said circuit means including an element sensitive to the temperature of said tube and having a magnetic core member with a permeability that decreases with increasing temperature and at least one winding wounD on said core member and connected with said auxiliary deflection means to decrease said current flow through the latter with increasing temperature of said tube, whereby said magnetic flux produced by the auxiliary deflection means is similarly decreased and the angle of incidence of the beam to the beam selecting means is changed to compensate for thermal expansion of said beam selecting means.
Claim 3
Dependent Claim
87 words
A color picture tube according to claim 1, in which said main deflection means includes coil means to produce the magnetic flux for deflecting said beam upon the flow of said deflection current therethrough, and said auxiliary deflection means includes a core and additional coil means wound on said core and electrically connected with said coil means of the main deflection means by said circuit means to produce said magnetic flux in opposition to the flux of said main deflection means in response to said current flow.
Claim 4
Dependent Claim
22 words
A color picture tube according to claim 2, in which said auxiliary deflection means is disposed adjacent to said main deflection means.
Claim 5
Dependent Claim
109 words
A color picture tube according to claim 2, in which said coil means of the main deflection means includes horizontal and vertical deflection coils to produce magnetic flux for deflecting said beam horizontally and vertically, respectively, said additional coil means is connected electrically by way of said circuit means with said horizontal deflection coil and is arranged to deflect said beam horizontally in opposition to the horizontal deflection of said beam resulting from said deflection current flow through said horizontal coil said phosphors are in the form of vertical stripes on said face plate, and said apertures of the beam selecting means are in the form of vertical slits.
Claim 6
Dependent Claim
71 words
A color picture tube according to claim 1, in which said element sensitive to the temperature of the tube is a variable inductance means having said one winding thereof connected in parallel with said auxiliary deflection means to said main deflection means so that said deflection current is proportioned between said auxiliary deflection means and said inductance means in dependence on the temperature sensed by said core member of variable permeability.
Claim 7
Dependent Claim
71 words
A color picture tube according to claim 1, in which said element sensitive to the temperature of the tube is in the form of a transformer having a primary winding in addition to said one winding, and said primary winding is connected with said main deflection means to receive said deflection current and to induce said current flow in said one winding by way of said core member of variable permeability.
Claim 8
Dependent Claim
38 words
A color picture tube according to claim 1, in which an adjustable DC current source is also connected with said auxiliary deflection means to cause the latter to compensate for deviations of said beam from a desired path.
Claim 9
Dependent Claim
101 words
A color picture tube according to claim 7, in which said element sensitive to the temperature of the tube is in the form of a transformer having a primary winding in addition to said one winding, said primary winding is connected with said main deflection means to receive said deflection current and to induce said current flow in said one winding by way of said core member of variable permeability, and means are provided to isolate said transformer from the influence of DC current from said source and to isolate said source from said current flow induced in said one winding.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |