US3594600A - Convergence means for a plural beam color picture tube - Google Patents

Convergence means for a plural beam color picture tube Download PDF

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US3594600A
US3594600A US888338A US3594600DA US3594600A US 3594600 A US3594600 A US 3594600A US 888338 A US888338 A US 888338A US 3594600D A US3594600D A US 3594600DA US 3594600 A US3594600 A US 3594600A
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Prior art keywords
beams
screen
deflection
horizontal
leakage flux
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US888338A
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English (en)
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Hiroshi Murata
Akiyoshi Inose
Masahide Sawai
Yuzo Fuse
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Sony Corp
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Sony Corp
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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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices
    • 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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least

Definitions

  • This invention relates generally to color picture tubes of the plural-beam type, and particularly to tubes of that type in which the plural beams are made to converge at a common point on a beam-selecting grid or mask associated with the color phosphor screen at which the beams are focused.
  • pairs of convergence deflecting plates Arranged along such divergent paths are pairs of convergence deflecting plates having voltages applied thereacross to deflect the divergent beams substantially in the plane of origination thereof for causing all beams to converge at a point on the apertured beam-selecting grid or shadow mask associated with the color screen.
  • the beams After passing between the convergence deflecting plates, the beams are acted upon by the magnetic fields resulting from the application of horizontal and vertical sweep signals to the corresponding coils of a deflection yoke, whereby the beams are made to scan the screen in the desired raster.
  • misconvergence can be corrected by suitably shaping and dimensioning the horizontal and vertical deflection coils, for example, as hereinafter described in detail, there remains a horizontal deviation of the raster of the central beam with respect to the rasters of the other two beams, particularly at the opposite side portions of the screen in the case of the beams originating in a horizontal plane.
  • Another object is to achieve the desired registration of the rasters by shielding one or more of the electron beams from a correction field which is applied to the remainder of the electron beams.
  • a further object is to achieve registration of the rasters by shielding the side beams from flux leakage from the horizontal deflection magnetic field produced by the deflection yoke, while permitting such leakage flux to act in a space through which one, for example, the central, electron beams passes, whereby to impart an additional horizontal deflection to the central beam as compared with the side beams.
  • a pluralbeam color picture tube is provided with magnetic shielding members disposed at outer sides of the paths of the side beams, preferably at the exit for the latter between the convergence deflecting plates, and each of the shielding members has a straight portion extending at right angles to the plane in which the beams originate and end portions provided on the ends of the straight portion and extending inwardly at substantial angles to the latter to act as magnetic shields so that leakage flux from the deflection yoke coil intended to deflect the beams at right angles to said plane is substantially prevented from acting on the side beams while being free to act on the central beam and thus from the correction field applied to the latter.
  • FIG. 1 is a schematic horizontal cross-sectional view showing a plural-beam, single-electron-gun-type color cathode-ray tube of the type to which the present invention can be applied;
  • FIGS. 2A and 2B are front and side views showing the mechanical arrangement of deflection yoke means applicable to the color cathode-ray tube of FIG. 1:
  • FIG. 3 is a diagrammatic view illustrating the manner in which the beams are deflected and converged, and showing the deviations thereof from correct convergence to be corrected by this invention
  • FIG. 4 is a horizontal cross-sectional view of the main portion of the color tube of FIG. I, but shown with an embodiment of the present invention applied thereto;
  • FIG. 5 is a transverse sectional view taken along line XX of the tube of FIG. 4;
  • FIG. 6 is a diagrammatic view showing the magnetic field distribution occurring in the embodiment of the invention illustrated by FIGS. 4 and 5.
  • the single-gun, plural-beam color picture tube 10 there shown may comprise a glass envelope (shown in dotted lines) having a neck, and a cone extending from the neck to a color screen S provided with the usual arrays of color phosphors S 8,, and S and with an apertured beamselecting grid or shadow mask G,..
  • a single electron gun having cathodes K K and K each of which is constituted by a beam-generating source with the respective beam-generating surfaces thereof disposed as shown in a plane which is substantially perpendicular to the axis of the electron gun.
  • the beamgenerating surfaces are arranged in a straight line so that the respective beams B,,, B and B, emitted therefrom are directed in a substantially horizontal plane containing the axis of the gun, with the central beam 8,; being coincident with such axis.
  • a first grid G is spaced from the beam-generating surfaces of cathodes k K and K, and has apertures g g and g,,, formed therein in alignment with the respective cathode beam-generating surfaces.
  • a common grid G is spaced from the first grid G, and has apertures g g and formed therein in alignment with the respective apertures of the first grid 0,.
  • electron beam convergence deflecting means F which comprise shielding plates P and P disposed in the depicted spaced, relationship at opposite sides of the gun axis, and axially extending, deflector plates 0 and O which are disposed, as shown, in outwardly spaced, opposed relationship to shielding plates P and P, respectively.
  • deflector plates and Q may, alternatively, be somewhat curved or outwardly bowed, as is well known in the art.
  • the shielding plates P and P are equally charged by a voltage V and disposed so that the central electron beam 8,; will pass substantially undeflected between the shielding plates P and P, while a voltage V is applied to the deflector plates Q and 0' so that the latter have negative charges with respect to the plates P and P, whereby electron beams B and B will be convergently deflected as shown by the respective passages thereof between the plates P and Q and the plates P and Q.
  • the respective electron beams B 8,; and B which emanate from the beam-generating surfaces of cathodes K K and K will pass through the respective apertures of grid G, to be intensity modulated with what may be termed red,” green and blue intensity modulation signals applied between the cathodes and the first grid (3,.
  • the respective electron beams will then pass through the common auxiliary lens L to cross each other at the center of the main lens L and emerge from the latter with beams B and B diverging from beam B Thereafter, the central electron beam 3,; will pass substantially undeflected between shielding plates P and P since the latter are at the same potential.
  • electron beam 8 passes between plates P and Q and electron beam B passes between plates P and 0, they will converge as a result of the convergence deflecting voltage applied therebetween.
  • the system of FIG. 1 is arranged so that the electron beams B B and B will desirably converge or cross each other at a common spot centered in an aperture between adjacent grid wires g of the beam-selecting grid or mask G, so as to diverge therefrom to strike the respective color phosphors of a corresponding array on screen S.
  • the respective electron beams B B and B are intended to be converged at screen grid G, and to diverge therefrom in such manner that electron beam B, will strike the "blue phosphor S electron beam 8,; will strike the green" phosphor S and electron beam 8,, will strike the red" phosphor S of the array or set corresponding to the grid aperture at which the beams converge.
  • Electron beam scanning of the face of the color phosphor 1968 is effected in a conventional manner, for example, by horizontal and vertical electromagnetic deflection means indicated in broken lines.
  • Deflection means 20 may be constructed as a deflection yoke having horizontal and vertical deflection coils wound in a saddlelike or toroidal form.
  • FIGS. 2A and 2B An example of a deflection yoke means capable of producing a pin-cushion-shaped deflection field, and a barrel-shaped vertical deflection field is shown at 20 in FIGS. 2A and 2B.
  • a deflection yoke 21 is provided on a yokesupporting annular member 24 which is enlarged at its front end in the form of a funnel.
  • a pair of vertical deflection coils V, and V, are symmetrically wound in a toroidal form on deflection yoke 21 with respect to horizontal plane H-H passing through the axis of the yoke. These vertical deflection coils are connected, for example, in series with each other.
  • the winding angle 0y at which the vertical deflection coils V, and V, are wound on the yoke 21, is selected to be greater than that which would produce a rectangular vertical deflection field.
  • the winding angle is set between 120 and 160.
  • a pair of saddle-shaped horizontal deflection coils H, and H extend within annular member 24 and are symmetrically located with respect to horizontal plane H-H. These horizontal deflection coils are connected, for example, in series with each other.
  • the left-hand side effective coil portion 22L of horizontal deflection coil H and the left-hand side effective coil portion 23L of horizontal deflection coil H are disposed in contact, or in closely spaced relationship with each other.
  • the right-hand side effective coil portion 22R of coil H and the right'hand side effective coil portion 23R of coil H are disposed in contact, or closely spaced relationship with each other.
  • the winding angles 6,, of coil portions 22L and 23L, and of coil portions 22R and 23R are selected to be between and
  • the front portions of coils H,, and H, adjacent the wide end of support 24 are constructed in the form of a winding represented by the nth power of the cosine, or cos where n is a positive number between 2 and 7.
  • the rear portions of coils H and H are constructed in the form ofa winding represented by the mth power of the cosine, or cos"', where m is a positive number between I and 3.
  • the three beams B 8,,- and B,, when being deflected horizontally and vertically are located in a common plane which is inclined with respect to the horizontal plane H-H through an angle corresponding substantially to the angle of vertical deflection, as the beams are always arranged on a substantially horizontal line.
  • the three beams in the common plane enter into the deflection yoke means 20 at difference incident angles due to convergence means F.
  • the deflection yoke means of FIGS. 2A and 2B is not employed, there is a tendency that the three beams will cross each other at a position which is short of the beam-selecting grid or mask when these beams are directed to the left or right-hand side portion thereof.
  • the deflection yoke means of FIGS. 2A and 2B beam 8 is deflected from its deflection center position across a field portion of minimum strength corresponding to the position of the deflection center for beam B and beam B is deflected from its deflection center position through a relatively strong portion of the pin-cushion-type field.
  • the three beams can be made up to converge accurately with each other at the beamselecting grid or mask.
  • the deflection yoke means of FIGS. 2A and 2B is not used, the three beams tend to cross each other short of the screen at the opposite sides as in the horizontal deflection.
  • the deflection yoke means of FIGS. 2A and 28 the three beams are subjected to substantially the same component of a barrel-type field so as to converge with each other at the grid or mask 6,, since they are not vertically spaced apart from each other.
  • the horizontal deflection coils By winding the horizontal deflection coils in a saddlelike form, it is possible to easily change the configurations of the portion of the horizontal deflection field on the screen side and that on the electron gun side so that, for example, one of the field portions can be of the barrel type, while the other field portion is of the pin-cushion type, while the remainder of the horizontal deflection field is either a pin-cushion-type or a barrel-type field. This would become difficult to achieve if the horizontal deflection coils were wound in toroidal form.
  • the horizontal deflection field is of the pin-cushion-type configuration.
  • the beams B, and B are deflected through angles sufiicient to cause their convergence at a common point on the beam-selecting grid or mask G
  • the central beam B which also passes through a relatively weak portion of the horizontal deflection field, travels through such portion of the field for a distance that is shorter than the path of beam 8,, in the horizontal deflection field and, as a result thereof, the deflection of beam B is less than that required to cause proper convergence of the latter beam with beams B and B
  • the central beam B arrives at the grid or mask at a point that is displaced inwardly from that common point, as shown in full lines on FIG. 3.
  • the above undesirable effect or deviation is corrected by shielding the side beams B and B, from a leakage flux produced by the horizontal deflection field of yoke 20, while permitting such leakage flux to act fully on central beam B so that the latter will be horizontally deflected by a greater angle to crossbeams B and B, at the common point of convergence of the latter at grid or mask G as indicated in broken lines at 8' on FIG. 3.
  • the shielding of side beams B and B, from the leakage flux from the horizontal deflection field may be advantageously effective at the exit of such beams from the convergence deflecting means F.
  • such convergence deflecting means F may have its electrode plates P and P attached to the end surface of cylindrical grid 6,, through conductive angle members 51 and 51', respectively. Electrode plates 0 and Q are attached to insulating members 53 and 53 mounted on support pins 52 and 52' extending from the electrode plates P and P respectively. Further, a brush or coil spring member 55 is secured to a bracing member 54 bridging the free ends of electrode plates P and P' so as to maintain a spacing between these electrode plates. Member 55 is in electrical contact with a conductive layer 56 extending over the inner surface of the neck portion N, and to which an anode voltage V, is applied by way of an anode button (not shown).
  • Electrodes Q and Q are connected with each other through a conductor wire 57, and a conductor wire 59 extends from electrode plate Q for example to a button 58 provided in the neck portion N for example, so that a voltage that is 200 to 300 volts lower than anode voltage V can be thereby applied to electrode plates Q and 0'.
  • magnetic shielding members Y and Y' are mounted on the outer surfaces of electrode plates 0 and 0', respectively, adjacent the ends of the latter remote from electrode 0;.
  • Each of these magnetic shielding members Y and Y may include a flat or straight portion 60 (FIG. 5) extending across the corresponding electrode plate Q or Q, and bent end portions 61 and 62 which extend inwardly from the opposite ends of straight portion 60.
  • the horizontal deflection magnetic leakage flux enters magnetic shielding member Y at its end portion 61, it will be apparent that the leakage flux occurring over the lateral extent of such end portion 61 will be collected thereby and the magnetic flux thus collected will arrive at end portion 62 of shielding member Y, and then be expanded.
  • the horizontal deflection magnetic leakage flux enters shielding member Y at its end portion 61 which collects the leakage flux over its lateral extent, and the flux thus collected travels through straight portion 60 to arrive at end portion 62 of shielding member Y and then be expanded.
  • the horizontal deflection leakage flux located laterally between the end portions 61 and the end portions 62 of shielding members Y and Y are substantially uninhibited by the latter and thus act on center beam B to relatively increase the horizontal deflection of the latter and thus restore the center beam to the position shown at 13' on FIG. I
  • shielding members Y and Y are located at the exit end of convergence deflecting means F, that is, close to the horizontal-vertical deflection yoke 20, it will be apparent that the leakage flux from the horizontal deflection field of yoke 20 which is allowed to act only on the center beam B will then be of relatively high density to provide a sufficiently large corrective or additional deflection to center beam 8 for correcting the deviation shown on FIG. 3.
  • magnetic yoke members are mounted on the plates P and P at the entry to convergence deflection means F so as to respectively extend between center beam B and side beam 8,, and between the center beam and the other side beam B
  • Such magnetic yoke members have bent end portions which extend outwardly therefrom and which serve to collect the leakage flux from the vertical deflection field of yoke 20 so that the leakage flux of the vertical deflection field occurring outside one of the magnetic yoke members is collected thereby and passes, with a relatively high density, to the other magnetic yoke member from which the flux again expands.
  • the concentration of the leakage flux between the yoke members provides a differential vertical deflection of the central beam with respect to the side beams so as to avoid a vertical deviation of the center beam from the point of convergence of the side beams when such beams are vertically deflected toward the top or bottom of the screen.
  • the described yoke members do provide the side beams with some shielding from the leakage flux of the horizontal deflection field, such leakage flux is too small at the entry to the convergence deflection means F to provide the relatively large additional deflection or correction required for correcting the deviation of the center beam shown on FIG. 3 hereof. Further, if the yoke members of U.S.
  • the above-described horizontal corrective effect can be produced merely by providing the magnetic shielding members Y and Y at the exit from convergence means F. Furthermore, the magnetic correcting field needed for assisting the horizontal deflection of the center beam is then obtained from the leakage component of the horizontal deflection field produced by deflection yoke means 20. Therefore, there is no need to provide any special electromagnetic means to produce the deflection correcting field.
  • the leakage component of the horizontal deflection field is used for aiding the horizontal deflection of the center beam in the described embodiment, it will be apparent that it is also possible to produce the aforementioned effect by providing additional, external electromagnet means or permanent magnet means to produce magnetic flux acting on the center beam and from which the side beams are shielded by member Y and Y.
  • the shielding members Y and Y according thereto are employed to correct a deviation of the raster of center beam B from the rasters of side beams B and B, that may remain even when the horizontal and vertical deflection coils are given the configuration described with reference to FIGS. 2A and 28.
  • the shielding members Y and Y can be still employed to correct the aforementioned deviation between the rasters of the three electron beams.
  • the three beams originate in a horizontal plane.
  • these three beams may originate in a vertical plane, in which case the horizontal deflection coils should be wound in a saddlelike form to produce a barrel-shaped horizontal deflection field, and the vertical deflection coils should be wound in a toroidal form to produce a pin-cushion-shaped field.
  • the direction in which the phosphor stripes of the screen and the grid wires of the grid extend should be changed to the horizontal direction, and the convergence deflecting means F is turned through to effect convergence of side beams B and B vertically toward center beam 8
  • the application of the present invention is not limited to tubes in which the plural beams originate on a straight horizontal or vertical line.
  • the invention is also applicable to tubes in which the origins of the three beams are in a delta arrangement, and the three beams are intended to converge at a common point on the beam-selecting grid or mask adjacent the color screen.
  • the present invention can be employed to increase the horizontal deflection of the center beam relative to the deflections of the side beams.
  • a color cathode-ray tube having means generating plural beams which are directed, at predetermined incident angles to each other for convergence on a screen, through horizontal and vertical deflection fields produced by electromagnetic deflection means and by which said beams are made to scan said screen, the improvement comprising magnetic shielding means disposed adjacent the paths of said beams through said deflection fields and being operative to selectively shield at least one of said beams from leakage flux from said horizontal deflection field while permitting said leakage flux to act on another of said beams for correcting deviations between the rasters of said plural beams on said screen.
  • a color cathode-ray tube in which said plural beams originate in a common plane and include a central beam and opposite side beams, and in which said magnetic shielding means are positioned to permit only said central beam to be acted upon by said leakage flux while shielding said side beams therefrom.
  • a color cathode-ray tube in which said magnetic shielding means includes two spaced-apart shielding members disposed at outer sides of the paths of said side beams and being shaped to collect and to direct around said side beams the leakage flux that would otherwise act on said side beams.
  • each of said shielding members includes a substantially straight portion extending substantially parallel to and in spaced relation to the straight portion of the other shielding member, and end portions at the ends of said straight portion and being directed at substantial angles to the latter in the direction toward the corresponding end portions of the other of said shielding members.
  • a color cathode-ray tube in which said common plane is horizontal and said straight portions of the yoke members extend substantially vertically so that said shielding members collect and direct around said side beams the leakage flux from the horizontal deflection field in the lateral regions through which said side beams pass.
  • a single-gun, plural-beam color picture tube which includes a color screen having arrays of color phosphors and beam-selecting means provided with apertures corresponding to said arrays, beam-generating means for directing a central electron beam and two side electron beams in a common plane toward said screen for impingement on respective phosphors of each array through the corresponding aperture, lens means for focusing said electron beams on said screen and having an optical center at which said beams are made to cross each other with said side beams emerging from said lens means along paths lying in said plane and which are divergent with respect to the central beam, electron beam convergence deflecting means operative, upon the application of a convergence deflecting voltage thereto, to deflect said side beams emerging along said divergent paths for convergence of all of said beams at an aperture of said beam-selecting means, and deflection yoke means having sweep signals applied thereto to provide fields which deflect said beams in directions respectively parallel and at right I angles to said plane for causing said beams to scan said screen;
  • a single-gun, plural-beam color picture tube in which said magnetic shielding means includes spaced-apart shielding members arranged at the outer sides of said side beams and each having a substantially straight portion at right angles to said plane and end portions at the ends of said straight portion and being directed inwardly at substantial angles to the latter.

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JP43096500A JPS4833529B1 (fi) 1968-12-30 1968-12-30

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JP (1) JPS4833529B1 (fi)
DE (1) DE1965538C3 (fi)
FR (1) FR2027389A1 (fi)
GB (1) GB1256399A (fi)
NL (1) NL168365C (fi)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800176A (en) * 1972-01-14 1974-03-26 Rca Corp Self-converging color image display system
US3860850A (en) * 1971-05-18 1975-01-14 Tokyo Shibaura Electric Co Color cathode ray tube with color raster displacement correction
US3892996A (en) * 1972-01-14 1975-07-01 Rca Corp Self-converging color television display system
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
DE2917268A1 (de) * 1978-05-01 1979-11-08 Rca Corp Farbfernsehbildroehre mit inline- strahlerzeugungssystem
DE3043048A1 (de) * 1979-11-15 1981-09-03 RCA Corp., 10020 New York, N.Y. Inline-farbbildroehre
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
USRE31552E (en) * 1972-01-14 1984-04-10 Rca Corporation Electron beam and deflection yoke alignment for producing convergence of plural in-line beams
US4556819A (en) * 1983-12-13 1985-12-03 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4625145A (en) * 1983-10-06 1986-11-25 U.S. Philips Corporation Color display tube with magnetic field shaping means
US4730144A (en) * 1986-08-27 1988-03-08 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4772826A (en) * 1986-06-26 1988-09-20 Rca Licensing Corporation Color display system
GB2237680A (en) * 1989-10-03 1991-05-08 Matsushita Electronics Corp Convergence correction in cathode ray tubes
US5233267A (en) * 1989-10-03 1993-08-03 Matsushita Electronics Corporation Dynamic convergence system for color cathode ray tubes having an in line electron gun

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7802129A (nl) * 1978-02-27 1979-08-29 Philips Nv Inrichting voor het weergeven van gekleurde beelden.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462638A (en) * 1967-07-10 1969-08-19 Sony Corp Electron beam correction apparatus for color picture tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462638A (en) * 1967-07-10 1969-08-19 Sony Corp Electron beam correction apparatus for color picture tube

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860850A (en) * 1971-05-18 1975-01-14 Tokyo Shibaura Electric Co Color cathode ray tube with color raster displacement correction
US3800176A (en) * 1972-01-14 1974-03-26 Rca Corp Self-converging color image display system
US3892996A (en) * 1972-01-14 1975-07-01 Rca Corp Self-converging color television display system
USRE31552E (en) * 1972-01-14 1984-04-10 Rca Corporation Electron beam and deflection yoke alignment for producing convergence of plural in-line beams
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
FR2425146A1 (fr) * 1978-05-01 1979-11-30 Rca Corp Tube image couleur comportant un canon electronique perfectionne a correction coma
DE2917268A1 (de) * 1978-05-01 1979-11-08 Rca Corp Farbfernsehbildroehre mit inline- strahlerzeugungssystem
DE3043048A1 (de) * 1979-11-15 1981-09-03 RCA Corp., 10020 New York, N.Y. Inline-farbbildroehre
US4634923A (en) * 1979-11-15 1987-01-06 Rca Corporation Color picture tube having improved electron gun
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
US4625145A (en) * 1983-10-06 1986-11-25 U.S. Philips Corporation Color display tube with magnetic field shaping means
US4556819A (en) * 1983-12-13 1985-12-03 Rca Corporation Color picture tube having inline electron gun with coma correction members
US4772826A (en) * 1986-06-26 1988-09-20 Rca Licensing Corporation Color display system
US4730144A (en) * 1986-08-27 1988-03-08 Rca Corporation Color picture tube having inline electron gun with coma correction members
GB2237680A (en) * 1989-10-03 1991-05-08 Matsushita Electronics Corp Convergence correction in cathode ray tubes
US5233267A (en) * 1989-10-03 1993-08-03 Matsushita Electronics Corporation Dynamic convergence system for color cathode ray tubes having an in line electron gun
GB2237680B (en) * 1989-10-03 1994-06-01 Matsushita Electronics Corp A color cathode ray tube

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DE1965538A1 (de) 1970-07-09
NL168365C (nl) 1982-03-16
FR2027389A1 (fi) 1970-09-25
NL6919591A (fi) 1970-07-02
DE1965538C3 (de) 1974-04-11
JPS4833529B1 (fi) 1973-10-15
NL168365B (nl) 1981-10-16
GB1256399A (en) 1971-12-08
DE1965538B2 (de) 1973-09-20

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