US3879635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved convergence and triad distortion correction means for wide angle cathode ray tube
Assignee: RCA Licensing Corp
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Filing: 1973-02-06
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Granted: 1975-04-22
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Expires: 1993-02-06
Abstract
Abstract Improved dynamic convergence means and triad distortion correction means which may advantageously be formed upon the core of a deflection yoke of a color television cathode ray tube. The dynamic convergence means includes six windings disposed upon an annular core about the tube neck to form a hexagonal set of magnetic flux paths which deflect beams disposed in a delta or triangular array radially outward from the center of the array. A combination of horizontal- and vertical-rate signals are applied to vary the convergence as a function of beam deflection. Beam triad distortion is corrected by providing four correction windings upon a common core with the convergence means such that a quadrilateral flux pattern is produced within the tube neck. Horizontal- and vertical-rate signals are applied to the distortion correction windings for expanding the beam array in a first direction, and compressing it in a second direction perpendicular to the first. The triad distortion correction means flux paths may be oriented generally parallel to the sides of the cathode ray tube viewing screen and formed on a common core with a deflection yoke which produces negligible triad distortion along the diagonals of the viewing screen. In another embodiment, a second distortion correction means is provided for producing magnetic fields oriented at substantially 45* to those of the first distortion correction means. A combination of horizontaland vertical-rate currents are applied to compensate for triad distortion along the diagonals of the viewing screen.
Inventors
- 👤 Bennie A Findeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:51
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/705; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H01J2229/00; H01J2229/56; H01J2229/568; H01J2229/5681; H01J2229/5687
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
138 words
Means for controlling the size and shape of a triangular array of electron beams within a color television cathode ray tube of the shadow mask type, comprising: a first plurality of windings disposed in a substantially regular array about the neck of the cathode ray tube and producing six time-varying magnetic poles for causing the electron beams to simultaneously advance or retreat from the center of the triangular array in accordance with position of said beams within said tube; and a second plurality of windings disposed in a substantially rectangular array about the neck of the cathode ray tube and producing four time-varying magnetic poles for causing the electron beam array to expand in a first direction and contract in a second direction perpendicular to the first direction in accordance with position of said beams within said tube.
Claim 2
Dependent Claim
138 words
Means for controlling the size and shape of a triangular array of electron beams within a color television cathode ray tube of the shadow mask type, comprising: a first plurality of windings disposed in a substantially regular array about the neck of the cathode ray tube and producing six time-varying magnetic poles for causing the electron beams to simultaneously advance or retreat from the center of the triangular array in accordance with position of said beams within said tube; and a second plurality of windings disposed in a substantially rectangular array about the neck of the cathode ray tube and producing four time-varying magnetic poles for causing the electron beam array to expand in a first direction and contract in a second direction perpendicular to the first direction in accordance with position of said beams within said tube.
Claim 3
Dependent Claim
138 words
Means for controlling the size and shape of a triangular array of electron beams within a color television cathode ray tube of the shadow mask type, comprising: a first plurality of windings disposed in a substantially regular array about the neck of the cathode ray tube and producing six time-varying magnetic poles for causing the electron beams to simultaneously advance or retreat from the center of the triangular array in accordance with position of said beams within said tube; and a second plurality of windings disposed in a substantially rectangular array about the neck of the cathode ray tube and producing four time-varying magnetic poles for causing the electron beam array to expand in a first direction and contract in a second direction perpendicular to the first direction in accordance with position of said beams within said tube.
Claim 4
Dependent Claim
138 words
Means for controlling the size and shape of a triangular array of electron beams within a color television cathode ray tube of the shadow mask type, comprising: a first plurality of windings disposed in a substantially regular array about the neck of the cathode ray tube and producing six time-varying magnetic poles for causing the electron beams to simultaneously advance or retreat from the center of the triangular array in accordance with position of said beams within said tube; and a second plurality of windings disposed in a substantially rectangular array about the neck of the cathode ray tube and producing four time-varying magnetic poles for causing the electron beam array to expand in a first direction and contract in a second direction perpendicular to the first direction in accordance with position of said beams within said tube.
Claim 5
Dependent Claim
29 words
The invention defined in claim 1 wherein said first and said second plurality of windings are disposed about a common point along the neck of the cathode ray tube.
Claim 6
Dependent Claim
36 words
The invention defined in claim 2, further including annular core means adapted to receive the neck of the cathode ray tube, wherein said first and said second plurality of windings are disposed upon said core means.
Claim 7
Dependent Claim
75 words
The invention defined in claim 3, further including a third plurality of windings adapted to produce four magnetic poles disposed in a substantially rectangular array about the neck of the cathode ray tube, said rectangular array being oriented at substantially 45* to the rectangular array produced by said second plurality of windings, for causing the electron beam array to expand in a third direction and contract in a fourth direction perpendicular to said third direction.
Claim 8
Dependent Claim
203 words
In a television receiver including a cathode ray tube including electron gun means for producing three electron beams in a triangular array and having a neck portion and face portion and including deflection means for deflecting said electron beam array in a vertical and a horizontal direction, said deflection means being adapted to produce substantially no distortion of said beam array along the diagonals of the face of the cathode ray tube: a first set of windings disposed about the neck portion of the cathode ray tube for producing a first magnetic field having flux lines extending in a substantially hexagonal configuration; means for applying time-varying currents to said first set of windings for varying the convergence of the electron beams in synchronism with the deflection thereof; a second set of windings disposed about the neck portion of the cathode ray tube for producing a second magnetic field therein having flux lines extending in a substantially quadrilateral configuration; and means for applying a second time-varying current to said second set of windings for elongating the electron beam array in a first direction and compressing it in a second direction perpendicular to the first direction in synchronism with the deflection of the electron beams.
Claim 9
Dependent Claim
203 words
In a television receiver including a cathode ray tube including electron gun means for producing three electron beams in a triangular array and having a neck portion and face portion and including deflection means for deflecting said electron beam array in a vertical and a horizontal direction, said deflection means being adapted to produce substantially no distortion of said beam array along the diagonals of the face of the cathode ray tube: a first set of windings disposed about the neck portion of the cathode ray tube for producing a first magnetic field having flux lines extending in a substantially hexagonal configuration; means for applying time-varying currents to said first set of windings for varying the convergence of the electron beams in synchronism with the deflection thereof; a second set of windings disposed about the neck portion of the cathode ray tube for producing a second magnetic field therein having flux lines extending in a substantially quadrilateral configuration; and means for applying a second time-varying current to said second set of windings for elongating the electron beam array in a first direction and compressing it in a second direction perpendicular to the first direction in synchronism with the deflection of the electron beams.
Claim 10
Dependent Claim
32 words
The invention defined in claim 5, wherein said first and said second sets of windings are disposed at a common position along the axis of the neck of said cathode ray tube.
Claim 11
Dependent Claim
119 words
The invention defined in claim 6, wherein said first set of windings comprises two groups of six windings each, one of said groups being adapted to receive time-varying currents which vary in synchronism with horizontal deflection of the electron beams, the other group of windings being adapted to receive time-varying current which varies in synchronism with vertical deflection of the electron beams; and wherein said second set of windings comprises two groups of four windings each, one of said groups being adapted to receive time-varying current which varies in synchronism with horizontal deflection of the electron beams, the other of said groups being adapted to receive time-varying current which varies in synchronism with vertical deflection of the electron beams.
Claim 12
Dependent Claim
35 words
The invention defined in claim 7, further including annular core means disposed about the neck of the cathode ray tube, wherein said first and said second sets of windings are disposed upon said core means.
Claim 13
Dependent Claim
17 words
The invention defined in claim 8, wherein said core means is the core of said deflection means.
Claim 14
Dependent Claim
50 words
The invention defined in claim 6, wherein said first set of windings comprises six series-connected windings disposed in regular fashion about the neck of the cathode ray tube, and said second set of windings comprises four series-connected windings disposed in regular fashion about the neck of the cathode ray tube.
Claim 15
Dependent Claim
248 words
In a televison receiver including a cathode ray tube having electron gun means therein adapted to produce three electron beams disposed in a substantially triangular array and having a neck portion and a faceplate portion, said receiver further including deflection yoke means including a core for deflecting the arrayed electron beams in a vertical and a horizontal manner, the combination comprising convergence means disposed adjacent the neck portion of the cathode ray tube for producing a magnetic field therein characterized by flux lines extending in a substantially hexagonal manner; means for applying time-varying current to said convergence means for varying the convergence of the electron beams in synchronism with the deflection thereof; first triad distortion correction means disposed adjacent the neck of the cathode ray tube for producing a magnetic field therewithin characterized by lines of flux extending in a substantially quadrilateral array; means for applying time-varying current to said triad distortion means for modifying the shape of the electron beam array in synchronism with the deflection; second triad distortion correction means comprising means adjacent the neck of the cathode ray tube for producing a magnetic field therein characterized by lines of flux extending in a substantially rectangular array, said rectangular aray being oriented at substantially 45* to said rectangular array produced by said first triad distortion correction means; and means for applying a time-varying current to said second triad distortion correction means for modifying the shape of the electron beam array in synchronism with the deflection thereof.
Claim 16
Dependent Claim
248 words
In a televison receiver including a cathode ray tube having electron gun means therein adapted to produce three electron beams disposed in a substantially triangular array and having a neck portion and a faceplate portion, said receiver further including deflection yoke means including a core for deflecting the arrayed electron beams in a vertical and a horizontal manner, the combination comprising convergence means disposed adjacent the neck portion of the cathode ray tube for producing a magnetic field therein characterized by flux lines extending in a substantially hexagonal manner; means for applying time-varying current to said convergence means for varying the convergence of the electron beams in synchronism with the deflection thereof; first triad distortion correction means disposed adjacent the neck of the cathode ray tube for producing a magnetic field therewithin characterized by lines of flux extending in a substantially quadrilateral array; means for applying time-varying current to said triad distortion means for modifying the shape of the electron beam array in synchronism with the deflection; second triad distortion correction means comprising means adjacent the neck of the cathode ray tube for producing a magnetic field therein characterized by lines of flux extending in a substantially rectangular array, said rectangular aray being oriented at substantially 45* to said rectangular array produced by said first triad distortion correction means; and means for applying a time-varying current to said second triad distortion correction means for modifying the shape of the electron beam array in synchronism with the deflection thereof.
Claim 17
Dependent Claim
183 words
The invention defined in claim 11, wherein said convergence means comprises two groups of six series-connected windings, one of said windings being adapted to produce a magnetic field which varies in synchronism with horizontal deflection of the electron beam array, the other of said windings being adapted to produce a magnetic field which varies in synchronism with vertical deflection of the electron beam array; said first triad distortion correction means comprises two groups of four series-connected windings each, said first group being adapted to produce a magnetic field which varies in synchronism with horizontal deflection of the electron beam array, said second group being adapted to produce a magnetic field which varies in synchronism with vertical deflection of the electron beam array; and said second triad distortion correction means comprises two groups of four series-connected windings each, said first group being adapted to produce a magnetic field which varies in synchronism with horizontal deflection of the electron beam array, said second group of windings being adapted to produce a magnetic field which varies in synchronism with vertical deflection of the electron beam array.
Claim 18
Dependent Claim
41 words
The invention defined in claim 12, further including annular core means disposed about the neck of the cathode ray tube, wherein all of the windings of said convergence means and said triad distortion correction means are disposed upon said core means.
Claim 19
Dependent Claim
18 words
The invention defined in claim 13, wherein said core means is the core of said deflection yoke means.
Claim 20
Dependent Claim
89 words
The invention defined in claim 11, wherein said convergence means comprises six series-connected windings adapted to receive current which varies in synchronism with horizontal and vertical deflection of the electron beam array; said first triad distortion correction means comprises four series-connected windings adapted to receive current which varies in synchronism with horizontal and vertical deflection of the electron beam array; and said second triad distortion correction means comprising four series-connected windings adapted to receive current which varies in synchronism with horizontal and vertical deflection of the electron beam array.
Claim 21
Dependent Claim
39 words
The invention defined in claim 15, further includes annular core means disposed about the neck of the cathode ray tube, wherein the windings of said convergence means and said triad distortion correction means are disposed upon said core means.
Claim 22
Dependent Claim
17 words
The invention defined in claim 16, wherein said core means is the core of said deflection yoke.
Claim 23
Dependent Claim
70 words
The invention defined in claim 13 wherein the windings of said first triad distortion correction means are spaced substantially 90* apart upon said annular core means and the windings of said second triad distortion correction means are spaced substantially 90* apart upon said annular core means, the windings of said second triad distortion correction means being displaced from the windings of said first triad distortion correction means by substantially 45*.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |