US3668580A - Toroidal deflection yoke having asymmetrical windings - Google Patents

Toroidal deflection yoke having asymmetrical windings Download PDF

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Publication number
US3668580A
US3668580A US95847A US3668580DA US3668580A US 3668580 A US3668580 A US 3668580A US 95847 A US95847 A US 95847A US 3668580D A US3668580D A US 3668580DA US 3668580 A US3668580 A US 3668580A
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vertical
horizontal
coil winding
quadrants
winding portions
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US95847A
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Robert Lloyd Barbin
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RCA Licensing Corp
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RCA Corp
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Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/764—Deflecting by magnetic fields only using toroidal windings

Definitions

  • a toroidal deflection yoke for a delta gun shadow mask color television picture tube includes windings having asymmetric conductor distributions to correct for effects such as unsymmetrical rnisconvergence of the electron beams across the scanned raster.
  • an asymmetric change top to bottom is made in the conductor distribution in either the horizontal or vertical coil windings and for convergence which is unsymmetrical left to right an asymmetric change left to right is made in the conductor distributions in either the horizontal or vertical coil windings.
  • This invention relates to toroidal deflection yokes having asymmetrical conductor winding distributions.
  • toroidal deflection yokes may be utilized advantageously with large screen wide deflection angle kinescopes.
  • One example of such a toroidal yoke is disclosed in copending application Ser. No. 42,927 filed June 3, 1970, by Wayne R. Chiodi and entitled Toroidal Electromagnetic Deflection Yoke.
  • This application describes a toroidal deflection yoke which requires no dynamic corner convergence correction.
  • the conductor winding distribution in each of the symmetrical vertical and horizontal coil portions is such that only a minimum number of parameters, i.e., number of conductor turns and spacing of conductors, need be varied for producing a yoke which yields satisfactory performance.
  • Such a yoke is desirable in that it is less expensive to make than saddle-type yokes and does not require the use of dynamic comer convergence correction circuitry in addition to the dynamic convergence circuitry ordinarily used.
  • theasymmetrical disposition of the three electron guns in the neck of the kinescope afiects the convergence differently at the top of the raster than at the bottom. This is caused by the guns being at the apices of an equilateral triangle with the red and green guns lying along one horizontal line and the blue gun being disposed between the 'red and green guns not on the same line.
  • crossover refers to the condition in which the red beam is low on the left and high on the right side of the raster in relation to the green electron beam.
  • crossunder refers to the condition in which the red electron beam is high on the left side and low on the right side of the raster in relation to the green electron beam.
  • a toroidal yoke for a delta gun shadow mask color television picture tube comprises vertical and horizontal winding conductors in each of four quadrants defined by the vertical and horizontal deflection axis.
  • the conductors of one of the vertical and horizontal coil winding portions in the top two quadrants have an asymmetric distribution relative to the conductors of the corresponding one of the vertical and horizontal coil winding portions in the bottom two quadrants.
  • the conductors of one of the vertical and horizontal coil winding portions in the two left quadrants have an asymmetric distribution relative to the conductors of the corresponding one of the vertical and horizontal coil winding portions in the two right quadrants.
  • the yoke is designed to operate in conjunction with a kinescope displaying both top to bottom and left to right misconvergence of the raster lines.
  • the conductors in one of the vertical and horizontal coil winding portions in the top two quadrants have an asymmetrical winding distribution relative to the conductor distribution of the corresponding coil winding portions in the bottom two quadrants and the conductors in one of the vertical and horizontal coil winding portions in the two left quadrants have an asymmetric distribution relative to the conductors in the corresponding coil winding portions in the two right quadrants.
  • the conductors of both the vertical and horizontal coil winding portions of two adjacent quadrants lying on one side of one of the deflection axes have respective asymmetric distributions relative to the conductors of the corresponding coil winding portions of adjacent quadrants lying on the other side of the particular deflection axis.
  • FIG. 1 is a side view, partly broken and partly in section of a kinescope and a toroidal deflection yoke positioned relative thereto;
  • FIG. 2 is a diagrrna illustrating top to bottom unsymmetrical convergence of the scanning lines of a raster of a color television picture tube;
  • FIG. 3 is a diagram illustrating left to right unsymmetrical convergence of the scanning lines of a-raster of a color television picture tube
  • FIG. 4 is a diagram illustrating the asymmetrical winding distribution of a toroidal deflection yoke according to the invention.
  • FIG. 5 is a schematic representation of the windings of the yoke illustrated in FIG. 4.
  • the rear portion of picture tube 11 contains an electron gun assembly 17 including three electron guns disposed at the apices of an equilateral triangle, the red and green guns lying on the left and right sides of the bottom of the triangle and the blue gun disposed at a point midway between and above the red and green guns.
  • a getter structure 18 is mounted adjacent the electron gun assembly along the inside surface of glass envelope 12. The getter extends beyond deflection yoke 20 and terminates in a structure 19 disposed against the envelope in front of the deflection yoke. The getter is flashed after the tube envelope is sealed and evacuated to eliminate any gases remaining within the sealed envelope.
  • a toroidally wound deflection yoke 20 encircles the flared bulb section of picture tube 11, the inside surface of which electron beams horizontally and vertically to scan a raster on the faceplate 13.
  • the return portions of conductors 21 are stretched between the front and rear rings 24 and 23 on the outside of core 22.
  • FIG. 2 is a diagram'illustrating in exaggerated form scanning lines of the red, blue and green electron beams at the top and I bottom of a raster.
  • the raster lines illustrated in FIG. 2 could be observed on the face of kinescope ll of FIG. 1 when appropriate operating potentials and test signals are applied to the'system.
  • At the bottom of rectangular raster 30 are three scanning lines; a red line 31, a blue line 32 and a green line 33. In this illustration the red, blue and green lines at the bottom of theraster are superimposed and the red and green lines 31 and 33 are shown dotted for illustrative purposes.
  • FIG. 2 is a diagram'illustrating in exaggerated form scanning lines of the red, blue and green electron beams at the top and I bottom of a raster.
  • the raster lines illustrated in FIG. 2 could be observed on the face of kinescope ll of FIG. 1 when appropriate operating potentials and test signals are applied to the'system.
  • FIG. 31 shows a raster which illustrates a type of asymmetric top to bottom beam convergence which may be encountered when a symmetrically wound toroidal yoke, one having symmetrical conductor distributions in all four quadrants, is utilized with a delta gun shadow mask picture tube.
  • the lines 31, 32 and 33 at the bottom of the raster are shown as representing an ideal situation in which the width of the three lines is the same and the convergence is the same from one side of the raster to the other.
  • a red line 31a, a blue line 32a and a green line 33a At the top of raster 30 are shown a red line 31a, a blue line 32a and a green line 33a.
  • the lines at the top of the raster illustrate a form of unsymmetrical misconvergence which is blue lines cross at a point 34 in the center of the raster.
  • This ideal condition inthe center of the raster is caused by the static on-axis convergence apparatus which is normally adjusted to create this condition.
  • FIG. 3 is a diagram illustrating a raster 30 in which the red, blue and green rasters are misconverged left to right across the raster.
  • the raster 30 in FIG. 3 is shown to have unsymmetrical misconvergence only at the bottom of the rasterand not at the top.
  • the red, blue and green raster lines 310, 32a and 33a, respectively, at the top of the raster are superimposed and are of the same width.
  • the red and green raster lines 31a and 33a are shown dotted and slightly separated for illustrative purposes.
  • the red line 31 is shown high on the left and high on the right relative to green raster line 33.
  • the blue raster line 32 is located vertically halfway between the red and green lines and is approximately the same width as the red and green lines but it is shifted to the left relative to those lines. It is believed this conditionis created by the interaction of the electromagnetic scanning field and the getter structure, which, as illustrated in FIG. 1, extends through and beyond the yoke core. It should be noted that if the direction of the horizontal scan is reversed from the direction indicated in FIG. 2 the position of the red and green lines is reversed from that shown, and the blue line is shifted to the right relative to the red and green lines.
  • the yoke was built having left to right conductor asymmetry only in the two lower quadrants.
  • FIG. 4 is a diagrammatic view illustrating a typical winding distribution of a toroidally wound deflection yoke according to the invention.
  • This yoke has an asymmetric conductor distribution to compensate for the unsymmetrical misconvergence conditions illustrated in FIGS. 2 and 3.
  • the view represents the active conductors at the front or large end of the yoke.
  • the yoke comprises a ferrite core 40 having a first layer of conductors 41 and a second layer of conductors 42 wound around the core.
  • the conductors are shown in two layers, the conductors may actually comprise a single layer with first layer representing the first group of conductors wound about the core, and the second layer representing another group of conductors subsequently wound on the core and interspersed between the conductors first laid down.
  • the return wires for conductors 41 and 42 would be disposed around the front of the yoke and travel to the back of the yoke outside the core 40.
  • the yoke illustrated is divided into quadrants I, II, III, and IV by respective vertical and horizontal axes 43 and 44, respectively. As illustrated the wires comprising the vertical deflection coil are indicated by the conductors marked with an X.” The horizontal wires are unmarked.
  • the conductor distribution of the first layer of conductors 41 is symmetrical in all four quadrants.
  • the conductors 41 are interconnected with the conductors 42 of the second layer as shown schematically in FIG. 5 with reference to the letters of each coil winding portion.
  • attention will be given to the conductors 42 in the second layer, the second layer containing the asymmetric distribution of conductors in the different quadrants.
  • the yoke illustrated in FIG. 4 is wound to correct for bothtop to bottom and left to right unsymmetrical misconvergence. For simplicity the winding distribution affecting each of the misconvergence will be described separately.
  • quadrants I and IV of FIG. 4 The conductor distribution for correcting the top to bottom unsymmetrical misconvergence illustrated inFIG. 2 is shown in quadrants I and IV of FIG. 4. It is to be understood that if the yoke were only required to correct a top to bottom misconvergence problem that the winding distribution in quadrant III would be symmetrical with that of quadrant IV; quadrants I and II would also be symmetrical, shown. Referring to the conductor distribution in quadrant I extending I then one space,
  • I red lines are above the counterclockwise from horizontal axis 44, horizontal conductorsextend to 0, then one space, vertical conductors from H ,to G, tow spaces and horizontal conductors-from P to Q.
  • both the vertical and horizontal conductor distribution in the top and bottom quadrants could be altered asymmetrically if the misconvergence problem requires that amount of change.
  • the choice of which conductors to alter can best be determined empirically for a given type yoke-kinescope combination.
  • the fundamental teaching of the invention is that the conductor distribution of the top quadrant must be asymmetric relative to the distribution of the conductors in the bottom two quadrants to achieve the best balance of top to bottom unsymmetrical misconvergence.
  • a toroidal yoke may be built according to the invention to correct either or both of the top to bottom and left to right convergence problems.
  • the yoke illustrated in FIG. 4 corrects for both the convergence problems illustrated in FIGS. 2 and 3.
  • FIG. 5 is a schematic representation of the yoke windings illustrated in FIG. 4.
  • the letters in FIG. 5 correspond to the letters of the end conductors of winding portions in FIG. 4.
  • the horizontal coil windings may be series or parallel connected to be driven by vacuum tube or transistor deflection current sources.
  • a and J are jumpered and the deflection current is applied to terminals Q and H.
  • parallel connection terminals J and H and Q and A, respectively, are jumpered and the deflection current applied to the two jumpered terminals.
  • the vertical coil windings are noramlly series connected as shown and the vertical deflection current is applied between terminals Q and A.
  • the invention was described as being incorporated in a toroidal deflection yoke which corrected for asymmetrical misconvergence caused by the asymmetry of the delta electron gun assembly and the interaction of the electromagnetic scanning field with the getter.
  • the same technique of building a yoke having asymmetric conductor distributions may be applied to correct for other system convergence unbalances such as caused by the vertical component of the earth's magnetic field.
  • the normal on-axis dynamic convergence waveforms are required for a system utilizing a deflection yoke in accordance with the invention.
  • No special dynamic corner correction waveform circuitry is required as the asymmetric windings eliminates the need therefor.
  • a toroidal deflection yoke for a delta gun shadow mask color television picture tube displaying a raster having unsymmetrical convergence along one of the deflection axes comprising:
  • the conductor distribution of at least one of the vertical and horizontal coil winding portions in one of adjacent quadrants on one side of and bounded by the vertical deflection axis being asymmetric relative to the coil winding distribution of the corresponding at least one of the vertical and horizontal coil winding portions of the other of said adjacent quadrants for producing a magnetic field for correcting said unsymmetrical top to bottom misconvergence;
  • the conductor distribution of at least one of the vertical and horizontal coil winding portions in one of adjacent quadrants on one side of and bounded by the horizontal deflection axis being asymmetric relative to the coil winding distribution of the corresponding at least one of the vertical and horizontal coil winding portions of the other of said adjacent quadrants for producing a magnetic field for correcting said unsymmetrical left to right misconvergence.
  • a toroidal defection yoke wherein the conductor distribution of the horizontal coil winding portions of one of adjacent quadrants bounded by the vertical deflection axes is asymmetrical relative to the conductor of .7 the other of said adjacent quadrants bounded by said vertical deflection axis; and V the conductor distribution of the horizontal coil winding 7 portions of one of adjacent quadrants bounded by the horizontal deflection axis is asymmetrical relative to the conductor distribution of the other of said adjacent quadrants bounded by said horizontal deflection axis.
  • the conductor distribution of both horizontal and vertical coil winding portions in one of two adjacent quadrants bounded by the horizontal deflection axis is asymmetric relative to the corresponding horizontal and vertical coil winding portions in.the other of said quadrantsbounded by the horizontal deflection axis.
  • the distribution of conductors of at least one of the vertical and horizontal coil winding portions in one of two adjacent quadrants on one side of and bounded by the vertical deflection axis being asymmetric relative to the conductor distribution of the corresponding at least one of the vertical and horizontal coil winding portions in the other of said two adjacent quadrants for producing a deflection field such as to correct said top to bottom unsymmetrical misconvergence;
  • the distribution of conductors of at least one of the vertical and horizontal coil winding portions in one of two adjacent quadrants on one side of and bounded by the horizontal deflection axis being asymmetric relative to the conductor distribution of the corresponding at least one of the vertical and horizontal coil winding portions in the other of said two adjacent quadrants for producing a deflection field such as to correct said left to right unsymmetrical misconvergence.

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US95847A 1970-12-07 1970-12-07 Toroidal deflection yoke having asymmetrical windings Expired - Lifetime US3668580A (en)

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US (1) US3668580A (pt)
AT (1) AT333860B (pt)
BE (1) BE776321A (pt)
BR (1) BR7108077D0 (pt)
CA (1) CA955992A (pt)
DE (1) DE2159385C3 (pt)
ES (1) ES397751A1 (pt)
FR (1) FR2117187A5 (pt)
GB (1) GB1373524A (pt)
IT (1) IT946061B (pt)
NL (1) NL7116732A (pt)
SE (1) SE373230B (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735193A (en) * 1970-12-26 1973-05-22 Denki Onkyo Co Ltd Deflection yoke
DE2603464A1 (de) * 1976-01-30 1977-08-04 Standard Elektrik Lorenz Ag Anordnung fuer eine toroidspulenablenkeinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514170A (en) * 1938-04-27 1939-11-01 British Thomson Houston Co Ltd Improvements in the magnetic deflection of the ray in cathode ray tubes
US2925542A (en) * 1957-05-31 1960-02-16 Gen Electric Deflection and dynamic convergence system for multi-beam cathode ray tubes
US3430099A (en) * 1966-08-23 1969-02-25 Gen Electric Simplified deflection system for plural in-line beam cathode ray tube
US3548350A (en) * 1969-01-15 1970-12-15 Gen Electric Wide angle deflection yoke for producing optimally non-uniform deflection fields

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514170A (en) * 1938-04-27 1939-11-01 British Thomson Houston Co Ltd Improvements in the magnetic deflection of the ray in cathode ray tubes
US2925542A (en) * 1957-05-31 1960-02-16 Gen Electric Deflection and dynamic convergence system for multi-beam cathode ray tubes
US3430099A (en) * 1966-08-23 1969-02-25 Gen Electric Simplified deflection system for plural in-line beam cathode ray tube
US3548350A (en) * 1969-01-15 1970-12-15 Gen Electric Wide angle deflection yoke for producing optimally non-uniform deflection fields

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735193A (en) * 1970-12-26 1973-05-22 Denki Onkyo Co Ltd Deflection yoke
DE2603464A1 (de) * 1976-01-30 1977-08-04 Standard Elektrik Lorenz Ag Anordnung fuer eine toroidspulenablenkeinheit

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Publication number Publication date
ES397751A1 (es) 1975-03-16
DE2159385C3 (de) 1974-05-30
ATA1035071A (de) 1976-04-15
FR2117187A5 (pt) 1972-07-21
GB1373524A (en) 1974-11-13
BE776321A (fr) 1972-04-04
CA955992A (en) 1974-10-08
DE2159385A1 (de) 1972-06-15
AT333860B (de) 1976-12-10
BR7108077D0 (pt) 1973-04-12
DE2159385B2 (de) 1973-11-08
IT946061B (it) 1973-05-21
NL7116732A (pt) 1972-06-09
SE373230B (pt) 1975-01-27

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Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

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Effective date: 19871208