US3806757A - In-line gun type color television picture tube apparatus - Google Patents

In-line gun type color television picture tube apparatus Download PDF

Info

Publication number
US3806757A
US3806757A US00265254A US26525472A US3806757A US 3806757 A US3806757 A US 3806757A US 00265254 A US00265254 A US 00265254A US 26525472 A US26525472 A US 26525472A US 3806757 A US3806757 A US 3806757A
Authority
US
United States
Prior art keywords
convergence
windings
deflection
current
cathode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00265254A
Other languages
English (en)
Inventor
S Saruta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denki Onkyo Co Ltd
Original Assignee
Denki Onkyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denki Onkyo Co Ltd filed Critical Denki Onkyo Co Ltd
Application granted granted Critical
Publication of US3806757A publication Critical patent/US3806757A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/705—Dynamic convergence systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
    • H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
    • H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
    • H01J31/206—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam with three coplanar electron beams

Definitions

  • ABSTRACT An in-line gun type color television picture tube apparatus in which electron beam spots are converged at any point on the screen by a convergence magnetic field in order to symmetrically shift the electron beams from the electron guns at both sides out of three electron guns, which are provided in one line of the in-line electron gun type color cathode-ray tube, in reference to the electron beam from the center electron gun.
  • an aperture frame having dot-type or slit-type openings such as, for example, a shadow mask or aperture grill is provided between the screen and electron guns and electron beams are preferred to be converged at each opening with specified angles.
  • the distance between the screen and the electron guns differs with the deflection angle, that is, the greater the deflection angle is, the longer the distance.
  • the electron guns are arranged so that the electron beams are converged at the center of the screen (the electron beams are actually converged at the openings of the aperture frame; however, the aperture frame is positioned close and parallel to the screen and therefore the electron beams are described as being converged at the screen for convenience), the electron beams are diverged at a portion where the deflection angle is large, that is, a peripheral portion of the screen. For this reason, the convergence operation to converge electron beams in accordance with the deflection angle, that is, the so-called dynamic convergence operation is performed.
  • the present invention provides a cathode-ray tube which requires no electrode for convergence in the cathode-ray tube and is capable of specifically converging the electron beams through an extremely simple construction.
  • An in-line gun type color television picture tube apparatus comprising an in-line gun type color cathoderay tube in which the spots on the screen of electron beams from free electron guns provided in one line are aligned on the same line and are converged at the center of the screen, a deflection yoke which deflects and scans the electron beams so that both side spots appear on the screen with equal distance symmetrically at both sides of the center spot when three electron beams are not converged, and a convergence magnetic field generating means which forms a convergence magnetic field having a field distribution linear-symmetrical in reference to two axes, as the reference line, which are biased respectively by 45 from the direction of three electron guns aligned in one line and the direction intersecting at a right angle to said direction of the electron guns in reference to the axis of the cathode-ray tube by, for example, providing the windings at specified positions on the core of said deflection yoke and supplying the convergence current to said windings, wherein both side electron beam
  • FIG. 1 is a cross sectional plan view illustrating an embodiment of a convergence magnetic field generating means of the apparatus according to the present invention
  • FIG. 2 is a front view of a screen illustrating the position of the beam spot trio
  • FIG. 3 is a longitudinal sectional view of a cathoderay tube illustrating an embodiment of a convergence magnetic field generating means of the apparatus according to the present invention
  • FIG. 4 is an example of the convergence current supplied to said convergence magnetic field generating means
  • FIGS. 5a, 5b and 5c are respectively an embodiment of the convergence magnetic field generating means; FIGS. 5a and 5b are an isometric view of a partially magnified convergence winding, and FIG. 5c is a cross sectional plan view of the cathode-ray tube, and
  • FIGS. 6a to 6f are respectively a circuit diagram illustrating an embodiment of the convergence magnetic field generating means.
  • FIG. 1 there is shown a rough construction of the apparatus according to the present invention.
  • Three electron guns 2, 2 and 2" are arranged on one line in the rear end plane of neck 12 of cathode-ray tube 1 and aperture frame 3 such as, for example, a shadow mask or an aperture grill, having a plurality of openings 31 such as through holes or slits is provided near the screen between screen 11 and the electron beams.
  • Electron guns 2, 2' and 2" are slanted so that electron beams 21, 22 and 23 radiated from the electron guns intersect at one point in the opening through which center axis 0 of selection frame 3 passes.
  • Deflection yoke 4 is mounted at neck 12 of cathoderay tube 1 and convergence coil 5 is provided at the rear end of the deflection coil which induces the convergence magnetic field.
  • cathode-ray tube 1 and electron guns 2, 2 and 2" are known as the in-line type cathode-ray tube and therefore can be designed as desired as in case of conventionally known in-line type color television picture tubes.
  • the electron beams are deflected in the electron gun aligning direction such as, for example, a horizontal direction and a direction at a right angle to said direction such as, for example, a
  • deflection in the horizontal direction is performed in a far shorter cycle than that in the vertical direction to form a raster on the screen of the picture tube.
  • the electron beams diverge depending on the deflection angle even though the electron beams are forced to concentrate at center on screen 11.
  • the electron beams are diverged on the screen in a relatively simple pattern depending on the deflection field of the deflection yoke and the curvature of the screen.
  • FIG. 2 there is shown the characteristic of the electron beam spot trio appearing on screen 11 through the deflection yoke of the apparatus according to the present invention.
  • the beam spot trio is an assembly of spot 211 formed by electron beam 21 radiated onto, for example, a red fluorescent material, spot 221 formed by electron beam 22 radiated onto, for example, a blue fluorescent material and spot 231 formed by electron beam 23 radiated onto, for example, a green fluorescent material.
  • a special line containing center 0 of the screen that is, the special line such as, for example, horizontal line 1 which coincides with the direction in which electron beams 21, 22 and 23 are arranged
  • the electron beams are deflected so that the distance between the spots increases as the spots depart from a line intersecting at a right angle to said special line at center 0 such as, for example, vertical line 1'.
  • the electron beams are deflected so that the distance between the spots increases as the spots depart from vertical line 1'.
  • the electron beams are deflected in the deflection field so that the electron beams are symmetrically diverged in reference to horizontal line 1 and vertical line 1.
  • Such the deflection field characteristic can be easily realized.
  • the convergence magnetic field which is the most important feature of the apparatus according to the present invention converges the electron beams which are diverged as described above.
  • FIG. 3 there is shown an embodiment of convergence coil of the apparatus according to the present invention.
  • Three electron beams 21, 22 and 23 are aligned on one line in neck 12 of cathode-ray tube 1 and core 51 consisting of a circular highly magnetic material is mounted on the periphery of neck 12.
  • a pair of windings 521 and 522 are toroidally wound on core 51 at symmetrical positions in the same direction as said electron guns are aligned, and a pair of windings 523 and 524 are toroidally wound at symmetrical positions in the direction intersecting at a right angle to the same direction as the electron guns are aligned.
  • windings are series-connected to power supply 53 which supplies convergence current 1 to said windings so that the magnetic fluxes from adjacent windings flow in opposite directions in the core. If the windings are wound on core 51 in the same direction, the windings are connected so that directions d of the currents in adjacent windings are opposite each other, and magnetic field M, from winding 521 shown in the figure, magnetic field M from winding 522, magnetic field M from winding 523 and magnetic field M, from winding 524 are induced respectively.
  • the magnetic fields show a linear symmetrical distribution of the magnetic field in reference to two axes x and y shifted by 45 degrees from the electron gun aligning direction and the direction intersecting, at center axis 0 of cathode-ray tube 1, at a right angle to the same direction as the electron guns are aligned, magnetic fields M and M do not affect the electron beams and magnetic fields M and M do not affect electron beam 23 at center axis 0 of cathode-ray tube 1. Accordingly, the magnetic force affecting electron beams comes from only magnetic field M, affecting electron beam 21 and magnetic field M affecting electron beam 23. This magnetic force causes said electron beams to be symmetrically shifted in reference to center electron beam 22.
  • convergence current 1 superposed on a parabola type current of horizontal deflection cycle D and a parabola type current of vertical deflection cycle Dy can be supplied from power supply 53.
  • a white round mark indicates the current value in the beginning of the horizontal deflection cycle and a black round mark indicates the current value at the end of the horizontal deflection cycle. The time between these timings is the flyback time.
  • Convergence current 1 as shown in FIG. 4 has been applied to conventional televison picture tubes and therefore it can be employed as is.
  • the coils of the deflection yoke are toroidally wound, a highly magnetic core is employed and therefore core 51 of the convergence coil and the core of the deflection yoke can be employed commonly.
  • the windings of the convergence coil can be mounted on the core of the deflection yoke. Accordingly, the deflection center of the deflection yoke can be matched with the convergence position and thus mislanding can be minimized.
  • one set of deflection coils for example, the horizontal deflection coils are wound toroidally and the other set of deflection coils, for example, the vertical deflection coils are wound in the frame shape, a convergence coil is wound, around the core of the vertical deflection coil.
  • the windings of said convergence coil need not be toroidally wound and if they are wound in the frame shape, the magnetic field as described above can be generated.
  • FIG. 5 there is shown an embodiment of the apparatus according to the present invention where the windings of the convergence coil are wound in the frame shape.
  • a pair of frame-shaped windings 522' and 524 can be arranged only at the position of axis y which deflects 45 in one direction from the direction from which electron beams 21, 22 and 23 are originated.
  • the magnetic fields having a similar distribution to that in case that two pairs of windings are arranged because magnetic fluxes induced by both windings 522' and 524 repulse each other.
  • convergence coil 5 When convergence coil 5 is thus comprised of the frame-shaped winding, it can be provided inside deflection yoke 4, that is, between deflection yoke 4 and neck 12 of cathode-ray tube 1 as shown in FIG. 5c. In this arrangement, convergence can be performed at the deflection center of the deflection yoke.
  • electron beams 21, 22 and 23 may be affected by other convergence magnetic fields, not by the intrinsically corresponding magnetic field; for example, center electron beam 22 may deviate from center axis and may be affected by either magnetic field M or M
  • the position of the toroidally wound deflection coil corresponds to the toroidal winding of the convergence coil. Accordingly, the convergence coil need not be provided additionally and convergence current I superposed on the deflection current can be supplied.
  • a pair of windings 41 and 41' of the horizontal deflection coil are wound in the frame shape at opposing positions and a pair of windings 42 and 42' of the vertical deflection coil are toroidally wound at opposing positions
  • a pair of windings 521 and 522 are toroidally wound on core 43 of the windings of the vertical deflection coil at the position at 90 to vertical deflectfin vvfnmngs a and 42', that is, at symmetrical positions in the direction from which electron beams 21, 22 and 23 are originated, in reference to axis 0 of cathode-ray tube 1.
  • Vertical deflection current I and convergence current I are supplied to vertical deflection windings 42 and 42 through distribution transformer T so that both currents do not interfere each other and, at the same time,
  • convergence current I is supplied to windings 521 and 522 exclusively used for convergence.
  • Vertical deflection power supply S is connected to the primary winding of distribution transformer T, both windings 42 and 42' of the vertical deflection coil are series-connected across terminals T and T at both ends of the secondary winding, and convergence windings 521 and 522 and convergence power supply 53 are series-connected between the intermediate connecting point 42a of both windings and center terminal T of the secondary winding.
  • convergence current I is supplied as shown with a broken line and arrow in the figure so that the current flows in opposite directions along the circumferential direction in adjacent windings which are all wound in the same direction, for example, in the counterclockwise direction, magnetic fields M M M and M, which are symmetrical in reference to tube axis 0 are induced.
  • vertical deflection current I flows in vertical deflection coils 42 and 42' but does not flow in convergence windings 521 and 522 because the potential at intermediate connecting point 42a between both vertical deflection coils 42 and 42' is equal to that at center terminal T of the secondary winding of the distribution transformer.
  • Both convergence windings 521 and 522 can be parallel-connected as shown in FIG. 6b.
  • Distribution transformer T can be employed for convergence power supply 53.
  • the primary winding of distribution transformer T can be connected to convergence power supply 53
  • convergence windings 521 and 522 and both vertical deflection windings 42 and 42 can be respectively series-connected between terminals T, and T of the secondary winding
  • vertical deflection power supply S can be connected between intermediate connecting point 42b of vertical deflection windings 42 and 42 and center terminal T of the secondary winding of distribution transformer T.
  • both the vertical deflection coil and the horizontal deflection coil are toroidally wound, convergence current I superposed on horizontal deflection current I or vertical deflection current I can be supplied to said both deflection coils.
  • vertical deflection power supply Sy is connected to the primary winding of one distribution transformer T of two distribution transformers T and T
  • windings 42 and 42' of the vertical deflection coil are seriesconnected between terminals T and T of the secondary winding
  • horizontal deflection power supply 5 is connected to the primary winding of other distribution transformer T
  • windings 41 and 41' of the horizontal deflection coil are series-connected between terminals T and T of the secondary winding.
  • Convergence power supply 53 is connected to the primary winding of dividing transformer T having a pair of independent secondary windings C and C one secondary winding C of dividing transformer T is connected between center terminal T of the secondary winding of distribution transformer T' for vertical deflection and intermediate connecting point 42c of vertical deflection windings 42 and 42, and the other secondary winding C is connected between center terminal T of the secondary winding of distribution transformer T" for horizontal deflection and intermediate connecting point 42d of horizontal deflection windings 41 and 41'.
  • the distribution transformer can be employed for the convergence power supply as shown in FIG. 46.
  • the distribution transformer is comprised of a pair of independent secondary windings C and C respectively provided with three terminals.
  • Transformer T is formed so that center terminal T of one secondary winding C is positioned at the electrical center between terminals T and T at both ends and center terminal T of other secondary winding C is positioned at the electrical center between terminals T and T at both ends.
  • Primary winding C" is connected to convergence power supply 53 and vertical deflection windings 42 and 42 are series-connected between terminals T and T of one secondary winding C, vertical deflection power supply S is connected between intermediate connecting point 420 of vertical deflection windings 42 and 42' and center terminal T horizontal deflection windings 41 and 41 are series-connected between terminals T and T of other secondary winding C, and horizontal deflection power supply S is connected between intermediate connecting point 42d of horizontal deflection windings 41 and 41.
  • the convergence current can be supplied from separate convergence power supply 53' to windings 521 and 522 exclusively employed as shown in FIG. 4f.
  • the apparatus of the present invention is advantageous because the convergence electrodes need not be provided in the cathode-ray tube and a deflection yoke in a complicated shape corresponding to said electrodes need not be provided.
  • the apparatus is advantageous because the electron beams can be shifted for convergence at the center of deflection to effectively prevent mislanding and the convergence current superposed on the deflection current can be supplied to the toroidally wound deflection coil, thus simplifying the construction of the apparatus.
  • An in-line gun type color television picture tube apparatus comprising:
  • an in-line gun type color cathode-ray tube in which three electron guns are arranged in a line along a first axis and the spots of electron beams from these electron guns appear along the first axis on the screen of the cathode-ray tube and are converged at the center of the screen,
  • a deflection yoke which deflects and scans the electron beams so that both side spots of the three electron beams appear on the screen at an equal distance on both sides of the center spot when the three electron beams are not converged
  • a convergence magnetic field generating means consisting essentially of at least one pair of convergence windings which are respectively provided externally on the neck of said cathode-ray tube and are opposite from each other in reference to the axis of the cathode-ray tube and a convergence power supply which supplies the convergence current to said windings which forms said convergence magnetic field generating means forming a convergence magnetic field having which shifts only said side electron beams and has a field distribution which is symetrical and linear in reference to a second and third axis, said second and third axes being positioned with respect to each other and 45 with respect to said first axis, the plane formed by said second and third axes being perpendicular to the axis of the cathode-ray tube, wherein both side electron beams are symmetrically shifted in reference to the center electron beam, as a function of the deflection angle, in order to complete convergence of the beam spot trio through said convergence magnetic field.
  • a deflection yoke deflects and scans the electron beams so that the distances between side spots and center spots appearing at two symmetrical positions in reference to the center of the screen are equal when three electron beams are not converged.
  • said at least one pair of convergence windings comprises two sets of said convergence windings arranged at positions at 90 from each other around the axis of said cathode-ray tube.
  • said deflection yoke is comprised of a ring-shaped yoke core surrounding the neck of the cathode-ray tube and a pair of coils which are opposed to each other and mounted on said yoke core, and wherein said yoke core is employed as the core for said convergence windings.
  • said convergence windings are formed with frame-shaped windings which are provided at the positions around the neck of said cathode-ray tube in two axial directions 45 from the first axis and the direction intersecting said first axis at a right angle.
  • An in-line gun type color television picture tube apparatus comprising:
  • an in-line gun type color cathode-ray tube in which three electron guns are arranged in a line along a first axis and the spots of electron beams from these electron guns appear along the first axis on the screen of the cathode-ray tube and are converged at the center of the screen,
  • a deflection yoke which deflects and scans the electron beams so that both side spots of the three electron beams appear on the screen at an equal distance on both sides of the center spot when the three electron beams are not converged
  • a convergence magnetic field generating means which forms a convergence magnetic field having a field distribution which is symmetrical and linear in reference to a second and third axis, said second and third axes being positioned 90 with respect to each other and 45 with respect to said first axis, the plane formed by said second and third axes being perpendicular to the axis of the cathode-ray tube, wherein both side electron beams are symmetrically shifted in reference to the center electron beam, as a function of the deflection angle, in order to complete convergence of the beam spot trio through said convergence magnetic field, and wherein,
  • said deflection yoke is comprised of a ring-shaped yoke core, a deflection coil having two pairs of windings opposing each other and mounted on said ring-shaped yoke core wherein at least one pair of said windings are toroidally wound and a power supply which supplies the deflection current to said deflection coil
  • said convergence magnetic field generating means is further comprised of a convergence power supply which supplies the convergence current and a current superposing means which superposes said convergence current on said deflection current, whereby said convergence current superposed on said deflection current is supplied, from said current superposing means in the direction opposite said deflection current, to one winding of at least one pair of toroidally wound deflection coils and, in the same direction as said magnetic current, to the other winding for generating said convergence magnetic field.
  • said current superposing means is comprised of a transformer which has a secondary winding provided with three terminals and the center terminal is positioned at an electrical center between the terminals at both ends, windings of the deflection coil which supply the convergence current are series-connected between the terminals at both ends of the secondary winding of said transformer, and one of said deflection current power supply and convergence current power supply is connected to the primary winding of said transformer and the other is connected between the intermediate connecting point and the center terminal of the secondary winding.
  • An apparatus wherein one pair of windings in said deflection coil are toroidally wound and the other is wound in the form of frame, a pair of convergence windings opposing each other are toroidally wound at the positions from a pair of said toroidally wound windings of deflection coil in reference to the axis of said cathode-ray tube, wherein said current superposing means is comprised of a transformer having a secondary winding provided with three terminals and the center terminal is positioned at the electrical center of the terminals wherein a pair of said toroidally wound windings of said deflection coil are series-connected between both terminals of the secondary winding of said transformer, and one of said deflection current power supply and said convergence current power supply is connected to the primary winding of said transformer and the other is connected between the intermediate connecting point of a pair of said toroidally wound windings of said deflection coil and the center terminal at the secondary side of said transformer.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US00265254A 1971-06-23 1972-06-22 In-line gun type color television picture tube apparatus Expired - Lifetime US3806757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4542971A JPS5631795B1 (enrdf_load_stackoverflow) 1971-06-23 1971-06-23

Publications (1)

Publication Number Publication Date
US3806757A true US3806757A (en) 1974-04-23

Family

ID=12719034

Family Applications (1)

Application Number Title Priority Date Filing Date
US00265254A Expired - Lifetime US3806757A (en) 1971-06-23 1972-06-22 In-line gun type color television picture tube apparatus

Country Status (2)

Country Link
US (1) US3806757A (enrdf_load_stackoverflow)
JP (1) JPS5631795B1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042020A1 (en) * 1980-06-13 1981-12-23 International Business Machines Corporation Convergence unit for cathode-ray tube
WO2001018841A1 (en) * 1999-09-06 2001-03-15 Koninklijke Philips Electronics N.V. Color display device having quadrupole convergence coils
US6376981B1 (en) 1997-12-29 2002-04-23 U.S. Philips Corporation Color display device having quadrupole convergence coils
US6411027B1 (en) 1997-12-29 2002-06-25 U.S. Philips Corporation Color display device having quadrupole convergence coils

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028521A (en) * 1956-12-21 1962-04-03 Zenith Radio Corp Image-reproducting device
US3117258A (en) * 1962-02-08 1964-01-07 Gen Electric Toroidal deflection yoke winding
US3325675A (en) * 1964-08-05 1967-06-13 Paramount Pictures Corp Three in-line gun magnetic convergence system
US3500114A (en) * 1967-08-24 1970-03-10 Sony Corp Convergence system for a color picture tube
US3553523A (en) * 1969-06-12 1971-01-05 Sylvania Electric Prod Convergence means for plural in-line beam cathode ray tube
US3613109A (en) * 1969-08-15 1971-10-12 Admiral Corp Horizontal convergence circuit
US3622927A (en) * 1970-01-20 1971-11-23 Clayton A Washburn Deflection yoke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028521A (en) * 1956-12-21 1962-04-03 Zenith Radio Corp Image-reproducting device
US3117258A (en) * 1962-02-08 1964-01-07 Gen Electric Toroidal deflection yoke winding
US3325675A (en) * 1964-08-05 1967-06-13 Paramount Pictures Corp Three in-line gun magnetic convergence system
US3500114A (en) * 1967-08-24 1970-03-10 Sony Corp Convergence system for a color picture tube
US3553523A (en) * 1969-06-12 1971-01-05 Sylvania Electric Prod Convergence means for plural in-line beam cathode ray tube
US3613109A (en) * 1969-08-15 1971-10-12 Admiral Corp Horizontal convergence circuit
US3622927A (en) * 1970-01-20 1971-11-23 Clayton A Washburn Deflection yoke

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042020A1 (en) * 1980-06-13 1981-12-23 International Business Machines Corporation Convergence unit for cathode-ray tube
US6376981B1 (en) 1997-12-29 2002-04-23 U.S. Philips Corporation Color display device having quadrupole convergence coils
US6411027B1 (en) 1997-12-29 2002-06-25 U.S. Philips Corporation Color display device having quadrupole convergence coils
WO2001018841A1 (en) * 1999-09-06 2001-03-15 Koninklijke Philips Electronics N.V. Color display device having quadrupole convergence coils

Also Published As

Publication number Publication date
JPS5631795B1 (enrdf_load_stackoverflow) 1981-07-23

Similar Documents

Publication Publication Date Title
EP0424888B1 (en) Color cathode ray tube apparatus
US3800176A (en) Self-converging color image display system
US4057747A (en) In-line plural beam color cathode ray tube having deflection defocus correcting elements
US4257024A (en) Color picture tube apparatus
US3735193A (en) Deflection yoke
CA1065383A (en) Display system utilizing beam shape correction
US3930185A (en) Display system with simplified convergence
US4386331A (en) Deflection yoke
US3970890A (en) Plural beam cathode ray tube including an astigmatic electron lens and self-converging
JPH0542776B2 (enrdf_load_stackoverflow)
US3721930A (en) Deflection yoke for use with in-line electron guns
US3806757A (en) In-line gun type color television picture tube apparatus
US3500114A (en) Convergence system for a color picture tube
US4900979A (en) Color cathode ray apparatus provided with dynamic convergence means
US5598055A (en) Deflection device for use in a color cathode-ray tube
US4866336A (en) Display device including a combination of a display tube and a deflection unit
KR930002657B1 (ko) 음극선관내의 복수의 전자빔을 수속하는 장치
US2824267A (en) Deflection yoke for multi-beam cathode ray tube
US3763452A (en) Color television picture tube apparatus
US4881015A (en) Color cathode-ray apparatus having an improved deflection unit
US3761763A (en) Color television picture tube apparatus
US4267541A (en) Deflection yoke apparatus with convergence device for in-line color television cathode-ray tube
US3689860A (en) Color picture tubes
JPH0594781A (ja) カラー表示管システム
US3081420A (en) Deflection yoke