US3772554A - In-line electron gun - Google Patents

In-line electron gun Download PDF

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US3772554A
US3772554A US00217758A US3772554DA US3772554A US 3772554 A US3772554 A US 3772554A US 00217758 A US00217758 A US 00217758A US 3772554D A US3772554D A US 3772554DA US 3772554 A US3772554 A US 3772554A
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apertures
paths
beams
electrode
screen
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R Hughes
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RCA Licensing Corp
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RCA 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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane
    • 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
    • H01J29/48—Electron guns
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/58—Electron beam control inside the vessel
    • H01J2229/581—Electron beam control inside the vessel by magnetic means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/58—Electron beam control inside the vessel
    • H01J2229/583—Electron beam control inside the vessel at the source
    • H01J2229/5835—Electron beam control inside the vessel at the source cooperating with the electron gun

Definitions

  • ABSTRACT The three co-planar beams of an in-line gun are converged near the screen of a cathode ray tube by means of two plate-like grids transverse to the beam paths and having corresponding apertures for the three beams.
  • the three beam apertures of the first grid are aligned with the three beam paths.
  • the two outer beam apertures of the second grid are offset outwardly relative to the beam paths to produce the desired convergence.
  • the three sets of apertures also provide separate focusing fields for the three beams.
  • the second plate-like grid is formed with a barrel shape, concave toward the first grid, to minimize elliptical distortion of beam spots on the screen due to crowding of the adjacent focusing fields.
  • Each of the two outer beams is partially shielded from the magnetic flux of the deflecting yoke by means of a magnetic ring surrounding the beam path in the deflection zone, to equalize the size of the rasters scanned on the screen by the middle and outer beams.
  • Other magnetic pieces are positioned on opposite sides of the path of the middle beam, to enhance one deflection field while reducing the transverse deflection field for that beam.
  • the present invention relates to an improved in-line electron gun for a cathode ray tube, particularly a shadow mask type color picture tube.
  • the new gun is primarily intended for use in a color tube having a line type color phosphor screen, with or without light absorbing guard bands between the colorlines, and a mask having elongated apertures or slits.
  • the gun could be used in the well known dot-type color tube having a screen of substantially circular color phosphor dots and a mask with substantially circular apertures.
  • An in-line electron gun is one designed to generate or initiate at least two, and preferably three, electron beams in a common plane, for example, by at least two cathodes, and direct those beams along convergent paths in that plane to a point or small area of convergence near the tube screen.
  • the gun may be designed to initially aim the beams, from the cathodes, towards convergence at the screen, as shown in FIG. 4 of the Moodey U.S. Pat. No. 2,957,106, wherein the beam apertures in the gun electrodes are aligned along convergent paths.
  • the Moodey patent referred to above also includes an embodiment, shown in FIG. 2 and described in lines 4 to 23 of column 5, wherein an in-line gun for two coplanar beams comprises two spaced cathodes, a control grid plate and an acceleratinggrid plate each having two apertures aligned respectively with the two cathodes (as in FIG. 2) to initiate two parallel co-planar beam paths, and two spaced-apart beam focusing and accelerating electrodes of cylindrical form.
  • the focusing electrode nearest to the first accelerating grid plate is described as having two beam apertures that are offset toward the axis of the gun from the corresponding apertures of the adjacent accelerating grid plate, to provide an asymmetric electrostatic field in the path of each beam for deflecting the beam from its initial path into a second beam path directed toward the tube axis.
  • Netherlands Pat. application No. 6,902,025, published Aug. 1 l, 1970 teaches that astigmatic aberration resulting in elliptical distortion of the focused screen spots of the two off-axis beams from an in-line gun, caused by the eccentricity of the in-line beams in a common focusing field between two hollow cylindrical focusing electrodes, can be partially corrected by forming the adjacent edges of the cylindrical electrodes with a sinusoidal contour including four sine waves.
  • a similar problem is solved in a different manner in applicant's in-line gun.
  • Another problem that exists in a cathode ray tube having an in-line gun is a coma distortion wherein the sizes of the rasters scanned on the screen by a conventional external magnetic deflection yoke are different, because of the eccentricity of the two outer beams with respect to the center of the yoke.
  • Messineo et al. U.S. Pat. No. 3,164,737 teaches that a similar coma distortion caused by using different beam velocities can be corrected by use of a magnetic shield around the path of one or more beams in a delta type gun.
  • Barkow U.S. Pat. No. 3,196,305 teaches the use of magnetic enhancers adjacent to the path of one or more beams in a delta gun, for the same purpose.
  • Krackhardt et al. U.S. Pat. No. 3,534,208 teaches the use of a magnetic shield around the middle one of three in-line beams for coma correction.
  • At least two electron beams are generated along co-planar paths toward the screen of a cathode ray tube, e.g., a shadow mask type color picture tube, and the beams are converged near the screen by asymmetric electric fields established in the paths of two beams by two plate-like grids positioned between the beam generating means and the screen and having corresponding apertures suitably related to the beam paths.
  • the apertures in the first grid are aligned with the beam paths.
  • Two apertures in the second grid are offset outwardly with respect to the beam paths to produce the desired asymmetric fields.
  • the two outer apertures are offset, and the middle apertures of the two grids are aligned with each other.
  • the pairs of corresponding apertures also provide separate focusing fields for the beams.
  • at least a portion of the second grid may be substantially cylindrically curved in a direction transverse to the common plane of the beams, and concave to the first grid.
  • Each of the two outer beam paths of a three beam gun may be partially shielded from the magnetic flux of the deflection yoke by means of a magnetic ring surrounding each beam in the deflection zone of the tube, to minimize differences in the size of the rasters scanned on the screen by the middle and outer beams. Further correction for coma distortion may be made by positioning magnetic pieces on opposite sides of the middle beam path for enhancing one field and reducing the field transverse thereto.
  • FIG. 1 is a plan view, partly in axial section, of a shadow mask color picture tube in which the present invention is incorporated;
  • FIG. 2 is a front end view of the tube of FIG. 1 showing the rectangular shape
  • FIG. 3 is an axial section view of the electron gun shown in dotted lines in FIG. 1, taken along the line 33 of that figure;
  • FIG. 4 is an axial section view of the electron'gun taken along the line 4-4 of FIG. 3;
  • FIG. 5 is a rear end view of the electron gun of FIG. 4, taken in the direction of the arrows 5-5 thereof;
  • FIG. 6 is a transverse view, partly in section, taken along the line 66 of FIG. 4;
  • FIG. 7 is a front end view of the electron gun of FIGS. 1 and 4;
  • FIG. 8 is a similar end view with the final element (shield cup) removed.
  • FIGS. 9 and are schematic views showing the focusing and converging electric fields associated with two pairs of beam apertures in FIG. 4.
  • FIG. 1 is a plan view of a 17V-90 rectangular color picture tube, for example, having a glass envelope 1 made up of a rectangular (FIG. 2) faceplate panel or cap 3 and a tubular neck 5 connected by a rectangular funnel 7.
  • the panel 3 comprises a viewing faceplate 9 and a peripheral flange or side wall 11 which is sealed to the funnel 7.
  • a mosaic three-color phosphor screen 13 is carried by the inner surface of the faceplate 9.
  • the screen is preferably a line screen with the phosphor lines extending substantially parallel to the minor axis YY of the tube (normal to the plane of FIG. 1).
  • a multi-apertured color selection electrode or shadow mask 15 is removably mounted, by conventional means, in predetermined spaced relation to the screen 13.
  • An improved in-line electron gun 19, shown schematically by dotted lines in FIG. 1, is centrally mounted within the neck 5 to generate and direct three electron beams along co-planar convergent paths through the mask 15 to the screen 13.
  • the tube of FIG. 1 is designed to be used with an external magnetic deflection yoke, such as the yoke 21 schematically shown, surrounding the neck 5 and funnel 7, in the neighborhood of their junction, for subjecting the three beams 20 to vertical and horizontal magnetic flux, to scan the beams horizontally and vertically in a rectangular raster over the screen 13.
  • the initial plane of deflection (at zero deflection) is shown by the line P-P in FIG. 1 at about the middle of the yoke 21. Because of fringe fields, the zone of deflection of the tube extends axially, from the yoke 21, into the region of the gun 19. For simplicity, the actual curvature of the deflected beam paths 20 in the deflection zone is notshown in FIG. 1.
  • the in-line gun 19 of the present invention is designed to generate and direct three equally-spaced coplanar beams along initially-parallel paths to a convergence plane CC, and then along convergent paths through the deflection plane to the screen 13.
  • the gun is preferably designed with small spacings between the beam paths at the convergence plane CC to produce a still smaller spacing, usually called the 8" value, between the outer beam paths and the central axis A-A of the tube, in the deflection plane P-P.
  • the convergence angle of the outer beams with the central axis is are tan e/c+d, where c is the axial distance between the convergencc plane CC and the deflection plane PP, d is the distance between the deflection plane and the screen 13, and e is the spacing between the outer beam paths and the central axis A-A in the convergence plane CC.
  • the approximate dimensions in FIG. I are c 2.7 inches, d 9.8 inches, e 0.200 inches (200 mils), and hence, the convergence angle is 55 minutes and s I57 mils.
  • the details of the improved gun 19 are shown in FIGS. 3 through 8.
  • the gun comprises two glass support rods 23 on which the various electrodes are mounted. These electrodes include three equallyspaced co-planar cathodes 25, one for each beam, a control grid electrode 27, a screen grid electrode 29, a first accelerating and focusing electrode 31, a second accelerating and focusing electrode 33, and a shield cup 35, spaced along the glass rods 23 in the order named.
  • Each cathode 25 comprises a cathode sleeve 37, closed at the forward end by a cap 39 having an end coating 41 of electron emissive material and a cathode support tube 43.
  • the tubes 43 are supported on the rods 23 by four straps 45 and 47 (FIG. 6).
  • Each cathode 25 is indirectly heated by a heater coil 49 positioned within the sleeve 37 and having legs 51 welded to heater straps 53 and 55 mounted by studs 57 on the rods 23 (FIG. 5).
  • the control and screen grid electrodes 27 and 29 are two closely-spaced (about 9 mils) flat plates having three pairs of small (about 25 mils) aligned apertures 59 centered with the cathode coatings 41 to initiate three equally spaced coplanar beam paths 20 extending toward the screen 13.
  • the initial paths 20a and 20b are substantially parallel and about 200 mils apart, with the middle path 20a coincident with the central axis A-A.
  • Electrode 31 comprises first and second cup-shaped members 61 and 63, respectively, joined together at their open ends.
  • the first cup-shaped member 61 has three medium-sized (about mils) apertures 75 close to grid electrode 29 and aligned respectively with the three beam paths 20, as shown in FIG. 4.
  • the second cup-shaped member 63 has three large (about 160 mils) apertures 65 alsoaligned with the three beam pathsQElectrode 33 is also cup-shaped and comprises a base plate portion 69 positioned close (about 60 mils) to electrode 31 and a side wall or flange 71 extending forward toward the tube screen.
  • the base portion 69 is formed with three apertures 73, which are preferably slightly larger (about 172 mils) than the adjacent apertures 67 of electrode 31.
  • the middle apertures 73a is aligned with the adjacent middle aperture 67a (and middle beam path 20a) to provide a substantially symmetrical beam focusing electric field between apertures 67a and 7311 when electrodes 31 and 33 are energized at different voltages.
  • the two outer apertures 73b are slightly offset outwardly with respect to the corresponding outer apertures 67b, to provide an asymmetrical electric field between each pair of outer apertures when electrodes 31 and 33 are energized, to individually focus each outer beam 20b near the screen, and also to deflect each beam, toward the middle beam, to a common point of convergence with the middle beam near the screen.
  • each beam aperture 73b may be about 6 mils
  • FIGS. 9 and 10 show the equipotential lines 74 rather than the lines of force.
  • the left half 75 on the left side of the central midplane
  • the right half 77 is diverging. Since the electrons are being accelerated, they spend more time in the converging field than in the diverging field, and hence, the beam experiences a net converging or focusing force in each of FIGS. 9 and 10. Since the middle beam 200 passes centrally through a symmetrical field in FIG. 9, it continues in the same direction without deflection.
  • the outer beam 20b traverses the left half 75 of the field centrally, but enters the right half 77 off axis. Since this is the diverging part of the field, and the electrons are subjected to field forces perpendicular to the equipotential lines or surfaces 74, the beam 20b is deflected toward the central axis (downward in FIG. as it traverses the right half 77, in addition to being focused.
  • the angle of deflection, or convergence, of the beam 29b can be determined by the choice of the offset of the apertures 73b and the voltage applied to the two electrodes 31 and 33.
  • electrode 33 would be connected to the ultor or screen voltage, about 25 I(.V., and electrode 31 would be operated at about 17 to 20 percent of the ultor voltage, adjusted for best focus.
  • the object distance of each focus lens that is, the distance between the first cross-over of the beams near the screen grid 29 and the lens, is about 0.500 inch; and the image distance from the lens to the screen is about l2.5 inches.
  • the focusing apertures 67 and 73 are made as large as possible, to minimize spherical aberration, and as close together as possible, to obtain a desirable small spacing between beam paths.
  • the fringe portions of adjacent fields interact to produce some astigmatic distortion of the focusing fields, which produces some ellipticity of the normally-circular focused beam spots on the screen. In a three-beam in-line gun, this distortion is greater for the middle beam than for the two outer beams, because both sides of the middle beam field are affected.
  • the wall 69 In order to compensate for this effect, and minimize the elliptical distortion of the beam spots, the wall 69, or at least the surface thereof facing the electrode 31, is curved substantially cylindrically, concave to electrode 31, in the direction normal plane transverse to the lane of the three beams, as shown at 79 in FIG. 3.
  • this curvature is greater for the middle beam path than for the outer beam paths, hence, the wall 69 may be made barrelshaped.
  • the barrel shape may have a stave radius of 8 inches (FIG. 4) and a hoop radius of 2.28 inches (FIG. 3), with the curvature 79 terminating at the outer edges of the outer apertures 73b.
  • the shield cup 35 comprises a base portion 81, attached to the open end of the flange 71 of electrode 33, and a tubular wall 83 surrounding the three beam paths 20.
  • the base portion 81 is formed with a large middle beam aperture 85 (about 172 mils) and two smaller outer beam apertures 87 (about 100 mils) aligned, respectively, with the three initial beam paths 20a and 20b.
  • the electron gun is provided with two shield rings 89 of high magnetic permeability, e.g., an alloy of 52 percent nickel and 48 percent iron, known as 52 metal, are attached to the base 81, with each ring concentrically surrounding one of the outer apertures 87, as shown in FIGS. 4 and 7.
  • shield rings 89 of high magnetic permeability e.g., an alloy of 52 percent nickel and 48 percent iron, known as 52 metal
  • the magnetic shields 89 by-pass a small portion of the fringe deflection fields in the path of the outer beams, thereby making a slight reduction in the rasters scanned by the outer beams on the screen.
  • the shield rings 89 may have an outer diameter of I50 mils, an inner diameter of 100 mils, and a thickness of 10 mils.
  • a further correction for this coma distortion is made by mounting two small discs 91 of magnetic material, e.g., that referred to above, on each side of the middle beam path 20a.
  • These discs 91 enhance the magnetic flux on the middle beam transverse to the plane of the three beams and decrease the flux in that plane, in the manner described in the Barkow patent referred to above.
  • the discs 91 may be rings having an outer diameter of mils, an inner diameter of 30 mils, and a thickness of 10 mils.
  • Each of the electrodes 27, 29, 31 and 33 are mounted on the two glass rods 23 by edge portions embedded in the glass.
  • the two rods 23 extend forwardly beyond the mounting portion of electrode 33, as shown in FIG. 3.
  • the shield cup 35 is formed with inwardly-extending recess portions 95 into which the rod ends 93 extend.
  • the electron gun 19 is mounted in the neck 5 at one end by the leads (not shown) from the various electrodes to the stem terminals 97, and at the other end by conventional metal bulb spacers (not shown) which also connect the final electrode 33 to the usual conducting coating on the inner wall of the funnel 7.
  • An in-line electron gun structure for producing three electron beams toward the target in a cathode ray tube, said gun structure comprising;
  • first electrode means for producing and directing three electron beams along spaced co-planar paths having a common general direction
  • second electrode means spaced along said beam paths between said first gun structure and said target for forming a separate focusing lens field in the path of each beam, wherein the lens field for the middle beam is symmetrical with the beam path for focusing only, and the two outer lens fields for the outer beams are asymmetric with respect to the other beam paths; said second electrode means comprising a pair of close-spaced electrode plate structures, each having three apertures therethrough, the middle aperture of each plate structure being aligned with the middle beam path, the outer apertures of the plate structure remote from the target being aligned with the respective outer beam paths, the outer apertures of the other plate structure being slightly offset outwardly relative to the respective outer beam paths.
  • a cathode ray tube including an evacuated envelope containing a screen of repeditive groups of different color emitting phosphor elements at one end and an in-line electron gun at the other end for generating and directing three electron beams along eo-planar paths toward said screen; said electron gun comprising:
  • first and second plate-like focusing grids spaced along said beam paths from said beam generating means in the order named, said first grid having three beam apertures respectively aligned with said three beam paths, said second grid having a middle aperture aligned with the middle one of said three beam paths and two outer apertures slightly offset outwardly with respect to the outer ones of said beam paths, the middle apertures of said grids being adapted when energized to provide a focusing electric field for said middle beam, and the corresponding offset outer apertures of said grids being adapted when energized to provide asymmetric electric fields for individually focusing said two outer beams and for converging them with the middle beam.
  • a color picture tube including an evacuated envelope comprising a faceplate and a neck connected by a funnel, a mosaic screen of repeditive groups of different color emitting phosphor elements on the inner surface of said faceplate, a multi-apertured color selection electrode spaced from said screen having each aperture aligned with a particular group of phosphor elements and an in-line electron gun mounted in said neck for generating and directing three electron beams along co-planar paths through said electrode to said screen; said electron gun comprising:
  • first and second plate-like focusing grids spaced along said beam paths from said beam generating means in the order named, said first grid having three beam apertures respectively aligned with said three beam paths, said second grid having a middle aperture aligned with the middle one of said three beam paths and two outer apertures slightly offset outwardly with respect to the outer ones of said beam paths, the middle apertures of said grids being adapted when energized to provide a focusing electric field for said middle beam, and the corresponding offset outer apertures of said grids being adapted when energized to provide asymmetric electric fields for individually focusing said two outer beams and for converging them with the middle beam.
  • said beam generating means comprises three cathodes positioned sideby-side in a common plane, each cathode having an electron-emissive surface facing said grids and initiating said co-planar paths, and at least one plate-like grid positioned close to said surfaces and having three apertures, small compared to the apertures of said firstnamed grids, aligned with said beam paths.
  • said tube includes a deflection zone, located in the vicinity of the junction between said neck and said funnel, wherein said beams are subjected to vertical and horizontal magnetic deflection fields during operation of said tube for scanning said beams horizontally and vertically over said screen; and said electron gun further comprises a shielding member of magnetic material surrounding each of said outer beam paths only, in said deflection zone, for partially shielding only the two outer beams from said magnetic deflecting fields, thereby reducing the size of the rasters scanned by the outer beams without reducing the size of the raster scanned by the middle beam.
  • a color picture tube including an evacuated envelope containing a faceplate and a neck connected by a funnel, a mosaic screen of repeditive groups of different color emitting phosphor elements on the inner surface of said faceplate, a multi-apertured color selection electrode spaced from said screen having each aperture aligned with a particular group of phosphor elements and an in-line electron gun for generating and directing three electron beams along co-planar paths through said electrode to said screen; said electron gun comprising:
  • first and second plate-like grids spaced along said beams paths from said beam generating means, each grid having three beam apertures substantially aligned respectively with said three beam paths, each pair of aligned apertures being adapted when energized to provide a focusing electric field for one of the three beams, at least the middle portion of said second plate-like grid bounding the middle aperture there-of being substantially cylindrically curved in a direction transverse to the common plane of said beam paths and apertures, and con cave to said first grid, to minimize the ellipticity of at least the middle beam spot on the screen caused by interaction of adjacent focusing electric fields 8.
  • a cathode ray tube comprising:
  • first electrode means including cathode means for producing and directing a plurality of electron beams toward said target electrode along a plurality of paths which are substantially parallel adjacent to said cathode means;
  • second electrode means comprising two electrode plates, each having a plurality of beam apertures therein through which said beam paths extend, for forming a plurality of substantially separate electric field lenses, one in each of said paths for focusing said beams near said target electrode; the centers of two of said apertures in the electrode plate closer to said target electrode being spaced further apart than the corresponding centers of two apertures in the other electrode plate for producing asymmetry in at least one of said lens for bending its associated beam toward another of said beams to provide beam convergence.
  • a cathode ray tube comprising:
  • first electrode means including cathode means for producing and directing a plurality of electron beams toward said target electrode along a plural ity of paths which are substantially parallel adjacent said cathode means;
  • second electrode means between said first electrode means and said target electrode for forming a substantially separate electric field lens in the path of each beam for focusing said beams near said target electrode, said second electrode means comprising two adjacent electrode plates having corresponding beam apertures therein through which said beam paths extend, and at least one of said electric field lenses being asymmetric for bending the beam passing therethrough toward at least one other beam;
  • At least one of said plates in said second electrode means being contoured for compensating for astigsaid beams.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US00217758A 1972-01-14 1972-01-14 In-line electron gun Expired - Lifetime US3772554A (en)

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KR (1) KR780000391B1 (ja)
AR (1) AR196104A1 (ja)
BE (1) BE793992A (ja)
BR (1) BR7300153D0 (ja)
CA (1) CA969597A (ja)
CS (1) CS199546B2 (ja)
DD (1) DD103093A5 (ja)
DE (1) DE2223369C3 (ja)
ES (1) ES410383A1 (ja)
FR (1) FR2167898B1 (ja)
GB (1) GB1381018A (ja)
IT (1) IT973241B (ja)
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Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889146A (en) * 1973-08-29 1975-06-10 Hitachi Ltd Electron gun assemblies for use in colour picture tubes
US3890528A (en) * 1974-03-29 1975-06-17 Gte Sylvania Inc Common focusing electrode for plurality of beams and having same plurality of internal shields
US3892996A (en) * 1972-01-14 1975-07-01 Rca Corp Self-converging color television display system
US3906279A (en) * 1972-12-16 1975-09-16 Philips Corp Cathode-ray tube for displaying coloured pictures
US3936692A (en) * 1973-08-08 1976-02-03 Hitachi, Ltd. Electron gun assembly for use in multi-beam type cathode ray tube
US3952224A (en) * 1974-10-04 1976-04-20 Rca Corporation In-line electron guns having consecutive grids with aligned vertical, substantially elliptical apertures
US3978367A (en) * 1975-02-27 1976-08-31 Westinghouse Electric Corporation Cathode ray tube second electrode having rectangular projecting ridge
US3984723A (en) * 1974-10-04 1976-10-05 Rca Corporation Display system utilizing beam shape correction
US3987328A (en) * 1975-08-22 1976-10-19 Hitachi, Ltd. In-line type electron gun assembly for use in multi-beam type color picture tubes
US4071803A (en) * 1974-09-19 1978-01-31 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
DE2914838A1 (de) * 1978-04-12 1979-10-18 Rca Corp Elektronenstrahlerzeugungssystem
DE2934993A1 (de) * 1978-09-08 1980-03-20 Philips Nv Farbbildroehre
DE2938769A1 (de) * 1978-09-25 1980-03-27 Rca Corp Elektronenstrahl-erzeugungssystem
US4207491A (en) * 1977-03-28 1980-06-10 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US4208610A (en) * 1978-06-09 1980-06-17 Zenith Radio Corporation Television picture tubes having an electron gun with aperture electrode shielding means
US4218634A (en) * 1977-10-05 1980-08-19 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun
US4318026A (en) * 1980-04-30 1982-03-02 Rca Corporation Method of making a grid for a cathode-ray tube electron gun
US4318027A (en) * 1978-04-12 1982-03-02 Rca Corporation High potential, low magnification electron gun
EP0049490A2 (en) * 1980-10-03 1982-04-14 Hitachi, Ltd. Electron gun for color picture tubes
DE3143022A1 (de) * 1980-10-29 1982-06-03 RCA Corp., 10020 New York, N.Y. "farbbildroehre mit verbessertem inline-elektronenstrahlsystem mit ausgedehnter fokuslinse"
US4334169A (en) * 1978-10-17 1982-06-08 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun structure
US4346327A (en) * 1978-02-27 1982-08-24 U.S. Philips Corporation Display tube for displaying color pictures
US4350923A (en) * 1980-03-27 1982-09-21 Rca Corporation Electron gun with balanced lens lips to reduce astigmatism
DE3216039A1 (de) * 1981-04-29 1982-11-18 RCA Corp., 10020 New York, N.Y. Elektronenstrahl-erzeugungssystem sowie kathodenstrahlroehre und fernsehempfaenger mit einem solchen system
DE3225632A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit verbessertem inline-strahlsystem mit ausgedehnter fokussierlinse
DE3225634A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit einem inline-elektronenstrahlsystem mit ausgedehnter fokuslinse und verbessertem stigmator
DE3225631A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit einem inline-elektronenstrahlsystem mit verbesserter ausgedehnter fokussierlinse
DE3225633A1 (de) * 1981-07-10 1983-03-17 RCA Corp., 10020 New York, N.Y. Geraet zur wiedergabe von farbbildern
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
DE3402857A1 (de) * 1983-01-27 1984-08-02 Rca Corp., New York, N.Y. Farbbildroehre mit inline-elektronenstrahlerzeugungssystem
US4486685A (en) * 1982-05-14 1984-12-04 Rca Corporation Electron gun assembly with bead strap having an angulated grasping member
DE3423485A1 (de) * 1983-06-27 1985-01-10 Rca Corp., New York, N.Y. Kathodenstrahlroehre mit einer elektronenkanone, die einen astigmatischen strahlformungsteil hat
US4514659A (en) * 1982-03-04 1985-04-30 Rca Corporation Inline electron gun for high resolution color display tube
US4520292A (en) * 1983-05-06 1985-05-28 Rca Corporation Cathode-ray tube having an asymmetric slot formed in a screen grid electrode of an inline electron gun
US4523123A (en) * 1983-05-06 1985-06-11 Rca Corporation Cathode-ray tube having asymmetric slots formed in a screen grid electrode of an inline electron gun
US4547697A (en) * 1983-07-22 1985-10-15 North American Philips Consumer Electronics Corp. CRT Shunt retaining means
US4558254A (en) * 1984-04-30 1985-12-10 Rca Corporation Cathode-ray tube having an improved low power cathode assembly
US4581560A (en) * 1981-12-16 1986-04-08 Hitachi, Ltd. Electron gun for color picture tube
US4604548A (en) * 1980-05-29 1986-08-05 Rca Corporation Electron gun with afterglow eliminator
US4608515A (en) * 1985-04-30 1986-08-26 Rca Corporation Cathode-ray tube having a screen grid with asymmetric beam focusing means and refraction lens means formed therein
US4620133A (en) * 1982-01-29 1986-10-28 Rca Corporation Color image display systems
US4634923A (en) * 1979-11-15 1987-01-06 Rca Corporation Color picture tube having improved electron gun
US4701678A (en) * 1985-12-11 1987-10-20 Zenith Electronics Corporation Electron gun system with dynamic focus and dynamic convergence
US4728915A (en) * 1986-03-18 1988-03-01 Matsushita Electronics Corporation Deflection yoke for a color cathode ray tube
US4771216A (en) * 1987-08-13 1988-09-13 Zenith Electronics Corporation Electron gun system providing for control of convergence, astigmatism and focus with a single dynamic signal
US4782263A (en) * 1984-05-21 1988-11-01 Rca Licensing Corporation Inline electron gun having at least one modified cathode assembly
US4883437A (en) * 1988-06-29 1989-11-28 Rca Licensing Corp. Method for spot-knocking an electron gun mount assembly of a crt utilizing a magnetic field
US4883438A (en) * 1988-06-29 1989-11-28 Rca Licensing Corp. Method for spot-knocking an electron gun mount assembly of a CRT
EP0361455A2 (en) * 1988-09-28 1990-04-04 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
US5036258A (en) * 1989-08-11 1991-07-30 Zenith Electronics Corporation Color CRT system and process with dynamic quadrupole lens structure
US5043625A (en) * 1989-11-15 1991-08-27 Zenith Electronics Corporation Spherical aberration-corrected inline electron gun
US5055749A (en) * 1989-08-11 1991-10-08 Zenith Electronics Corporation Self-convergent electron gun system
US5449983A (en) * 1993-04-20 1995-09-12 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
US5486735A (en) * 1992-11-02 1996-01-23 Kabushiki Kaisha Toshiba Electron gun with improved withstand voltage for color-picture tube
US5517078A (en) * 1993-05-14 1996-05-14 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
EP0892421A1 (en) * 1997-07-15 1999-01-20 Hitachi, Ltd. Color cathode ray tube
US5939820A (en) * 1995-07-28 1999-08-17 Lg Electronics Inc. Electron gun with focusing electrode having a curved surface
US6147447A (en) * 1997-06-13 2000-11-14 Thomson Tubes Electroniques Electronic gun for multibeam electron tube and multibeam electron tube with the electron gun
US6239542B1 (en) * 1998-05-11 2001-05-29 U.S. Philips Corporation Cathode ray tube having an electron gun with magnetic elements
US6259195B1 (en) * 1994-08-25 2001-07-10 U.S. Philips Corporation Cathode ray tube provided with an electron gun, and electrostatic lens system
FR2806526A1 (fr) * 2000-03-14 2001-09-21 Samsung Sdi Co Ltd Canon a electrons et tube cathodique en couleur muni de celui-ci
US20040140751A1 (en) * 2001-06-01 2004-07-22 Van Der Vaart Nijs Cornelis Display tube and display device

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5342053Y2 (ja) * 1972-02-05 1978-10-11
JPS5721255Y2 (ja) * 1972-11-06 1982-05-08
JPS552700B2 (ja) * 1973-06-12 1980-01-22
JPS5038462A (ja) * 1973-08-08 1975-04-09
JPS50103260A (ja) * 1974-01-11 1975-08-15
JPS50141220A (ja) * 1974-04-30 1975-11-13
JPS5520632B2 (ja) * 1974-06-13 1980-06-04
JPS5615102B2 (ja) * 1974-10-14 1981-04-08
JPS5212564A (en) * 1975-07-18 1977-01-31 Matsushita Electronics Corp Cathode ray tube
JPS5845135B2 (ja) * 1975-11-12 1983-10-07 株式会社日立製作所 ヘンコウジカイセイギヨソシツキカラ−ジユゾウカン
JPS5297055U (ja) * 1976-01-19 1977-07-20
JPS587016B2 (ja) * 1976-06-28 1983-02-08 松下電子工業株式会社 インライン形複ビ−ム電子銃
JPS5342212U (ja) * 1976-09-17 1978-04-12
JPS5342672A (en) * 1976-09-30 1978-04-18 Mitsubishi Electric Corp Color picture receiving tube device
US4049990A (en) * 1976-10-08 1977-09-20 Gte Sylvania Incorporated CRT in-line gun electrode having strengthening ribs
JPS57519Y2 (ja) * 1977-05-09 1982-01-06
DE2832687C2 (de) * 1978-07-26 1984-01-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektronenstrahlerzeugungssystem einer Farbbildkathodenstrahlröhre
JPS5625444U (ja) * 1980-07-15 1981-03-09
JPS58181476U (ja) * 1982-05-25 1983-12-03 元田電子工業株式会社 自動搬送機のバランス装置
EP0116465B1 (en) * 1983-02-09 1987-01-21 Nec Corporation Colour cathode ray tube
US5038073A (en) * 1988-12-23 1991-08-06 Samsung Electron Devices Co., Ltd. Electron gun for cathode ray tube
US5061881A (en) * 1989-09-04 1991-10-29 Matsushita Electronics Corporation In-line electron gun
EP1943661B1 (en) * 2005-09-06 2012-02-08 Carl Zeiss SMT GmbH Charged particle inspection method and charged particle system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2412687A (en) * 1942-04-08 1946-12-17 Emi Ltd Electron lens
US2849647A (en) * 1954-03-04 1958-08-26 Philips Corp Color television reproducing device
US2859378A (en) * 1956-05-21 1958-11-04 Gen Electric Electrode system for cathode ray tubes
US2887598A (en) * 1956-04-16 1959-05-19 Rca Corp Plural gun cathode ray tube
US2957106A (en) * 1954-08-12 1960-10-18 Rca Corp Plural beam gun
US3164737A (en) * 1961-05-08 1965-01-05 Rca Corp Cathode ray tube
US3196305A (en) * 1961-12-07 1965-07-20 Rca Corp Magnetically scanned cathode ray tube with raster altering means
US3534208A (en) * 1968-05-24 1970-10-13 Gen Electric Cathode ray tube having three in-line guns and center beam convergence shield modifying center beam raster size
US3678316A (en) * 1967-11-11 1972-07-18 Philips Corp Plural beam cathode ray tube having boundary-shaped cylindrical electrodes correcting beam aberration

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3651369A (en) * 1968-11-13 1972-03-21 Sony Corp Cathode ray tube

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2412687A (en) * 1942-04-08 1946-12-17 Emi Ltd Electron lens
US2849647A (en) * 1954-03-04 1958-08-26 Philips Corp Color television reproducing device
US2957106A (en) * 1954-08-12 1960-10-18 Rca Corp Plural beam gun
US2887598A (en) * 1956-04-16 1959-05-19 Rca Corp Plural gun cathode ray tube
US2859378A (en) * 1956-05-21 1958-11-04 Gen Electric Electrode system for cathode ray tubes
US3164737A (en) * 1961-05-08 1965-01-05 Rca Corp Cathode ray tube
US3196305A (en) * 1961-12-07 1965-07-20 Rca Corp Magnetically scanned cathode ray tube with raster altering means
US3678316A (en) * 1967-11-11 1972-07-18 Philips Corp Plural beam cathode ray tube having boundary-shaped cylindrical electrodes correcting beam aberration
US3678320A (en) * 1967-11-11 1972-07-18 Philips Corp Cathode ray tube having triangular gun array and curvilinear spacing between the fourth and fifth grids
US3534208A (en) * 1968-05-24 1970-10-13 Gen Electric Cathode ray tube having three in-line guns and center beam convergence shield modifying center beam raster size

Cited By (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892996A (en) * 1972-01-14 1975-07-01 Rca Corp Self-converging color television display system
US3906279A (en) * 1972-12-16 1975-09-16 Philips Corp Cathode-ray tube for displaying coloured pictures
US3936692A (en) * 1973-08-08 1976-02-03 Hitachi, Ltd. Electron gun assembly for use in multi-beam type cathode ray tube
US3889146A (en) * 1973-08-29 1975-06-10 Hitachi Ltd Electron gun assemblies for use in colour picture tubes
US3890528A (en) * 1974-03-29 1975-06-17 Gte Sylvania Inc Common focusing electrode for plurality of beams and having same plurality of internal shields
US4071803A (en) * 1974-09-19 1978-01-31 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US3984723A (en) * 1974-10-04 1976-10-05 Rca Corporation Display system utilizing beam shape correction
US3952224A (en) * 1974-10-04 1976-04-20 Rca Corporation In-line electron guns having consecutive grids with aligned vertical, substantially elliptical apertures
US3978367A (en) * 1975-02-27 1976-08-31 Westinghouse Electric Corporation Cathode ray tube second electrode having rectangular projecting ridge
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
US3987328A (en) * 1975-08-22 1976-10-19 Hitachi, Ltd. In-line type electron gun assembly for use in multi-beam type color picture tubes
US4207491A (en) * 1977-03-28 1980-06-10 Tokyo Shibaura Electric Co., Ltd. Electron gun assembly
US4218634A (en) * 1977-10-05 1980-08-19 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun
DE2907192A1 (de) * 1978-02-24 1979-08-30 Rca Corp Farbbildroehre mit verbessertem strahlerzeugungssystem
US4346327A (en) * 1978-02-27 1982-08-24 U.S. Philips Corporation Display tube for displaying color pictures
DE2914838A1 (de) * 1978-04-12 1979-10-18 Rca Corp Elektronenstrahlerzeugungssystem
US4318027A (en) * 1978-04-12 1982-03-02 Rca Corporation High potential, low magnification electron gun
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
US4208610A (en) * 1978-06-09 1980-06-17 Zenith Radio Corporation Television picture tubes having an electron gun with aperture electrode shielding means
DE2934993A1 (de) * 1978-09-08 1980-03-20 Philips Nv Farbbildroehre
DE2938769A1 (de) * 1978-09-25 1980-03-27 Rca Corp Elektronenstrahl-erzeugungssystem
US4334169A (en) * 1978-10-17 1982-06-08 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun structure
US4634923A (en) * 1979-11-15 1987-01-06 Rca Corporation Color picture tube having improved electron gun
US4350923A (en) * 1980-03-27 1982-09-21 Rca Corporation Electron gun with balanced lens lips to reduce astigmatism
US4318026A (en) * 1980-04-30 1982-03-02 Rca Corporation Method of making a grid for a cathode-ray tube electron gun
US4604548A (en) * 1980-05-29 1986-08-05 Rca Corporation Electron gun with afterglow eliminator
EP0049490A2 (en) * 1980-10-03 1982-04-14 Hitachi, Ltd. Electron gun for color picture tubes
EP0049490A3 (en) * 1980-10-03 1982-09-22 Hitachi, Ltd. Electron gun for color picture tubes
DE3143022A1 (de) * 1980-10-29 1982-06-03 RCA Corp., 10020 New York, N.Y. "farbbildroehre mit verbessertem inline-elektronenstrahlsystem mit ausgedehnter fokuslinse"
DE3216039A1 (de) * 1981-04-29 1982-11-18 RCA Corp., 10020 New York, N.Y. Elektronenstrahl-erzeugungssystem sowie kathodenstrahlroehre und fernsehempfaenger mit einem solchen system
US4409514A (en) * 1981-04-29 1983-10-11 Rca Corporation Electron gun with improved beam forming region
DE3225633A1 (de) * 1981-07-10 1983-03-17 RCA Corp., 10020 New York, N.Y. Geraet zur wiedergabe von farbbildern
DE3225632A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit verbessertem inline-strahlsystem mit ausgedehnter fokussierlinse
DE3249810C2 (ja) * 1981-07-10 1990-02-15 Rca Licensing Corp., Princeton, N.J., Us
DE3225631A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit einem inline-elektronenstrahlsystem mit verbesserter ausgedehnter fokussierlinse
DE3225634A1 (de) * 1981-07-10 1983-02-03 RCA Corp., 10020 New York, N.Y. Farbbildroehre mit einem inline-elektronenstrahlsystem mit ausgedehnter fokuslinse und verbessertem stigmator
US4581560A (en) * 1981-12-16 1986-04-08 Hitachi, Ltd. Electron gun for color picture tube
US4620133A (en) * 1982-01-29 1986-10-28 Rca Corporation Color image display systems
US4514659A (en) * 1982-03-04 1985-04-30 Rca Corporation Inline electron gun for high resolution color display tube
US4486685A (en) * 1982-05-14 1984-12-04 Rca Corporation Electron gun assembly with bead strap having an angulated grasping member
US4513222A (en) * 1983-01-27 1985-04-23 Rca Corporation Color picture tube having reconvergence slots formed in a screen grid electrode of an inline electron gun
DE3402857A1 (de) * 1983-01-27 1984-08-02 Rca Corp., New York, N.Y. Farbbildroehre mit inline-elektronenstrahlerzeugungssystem
US4523123A (en) * 1983-05-06 1985-06-11 Rca Corporation Cathode-ray tube having asymmetric slots formed in a screen grid electrode of an inline electron gun
US4520292A (en) * 1983-05-06 1985-05-28 Rca Corporation Cathode-ray tube having an asymmetric slot formed in a screen grid electrode of an inline electron gun
DE3423485A1 (de) * 1983-06-27 1985-01-10 Rca Corp., New York, N.Y. Kathodenstrahlroehre mit einer elektronenkanone, die einen astigmatischen strahlformungsteil hat
US4547697A (en) * 1983-07-22 1985-10-15 North American Philips Consumer Electronics Corp. CRT Shunt retaining means
US4558254A (en) * 1984-04-30 1985-12-10 Rca Corporation Cathode-ray tube having an improved low power cathode assembly
US4782263A (en) * 1984-05-21 1988-11-01 Rca Licensing Corporation Inline electron gun having at least one modified cathode assembly
US4608515A (en) * 1985-04-30 1986-08-26 Rca Corporation Cathode-ray tube having a screen grid with asymmetric beam focusing means and refraction lens means formed therein
DE3614429A1 (de) * 1985-04-30 1986-10-30 Rca Corp., Princeton, N.J. Kathodenstrahlroehre mit asymmetrischer strahlfokussierung
US4701678A (en) * 1985-12-11 1987-10-20 Zenith Electronics Corporation Electron gun system with dynamic focus and dynamic convergence
US4728915A (en) * 1986-03-18 1988-03-01 Matsushita Electronics Corporation Deflection yoke for a color cathode ray tube
US4771216A (en) * 1987-08-13 1988-09-13 Zenith Electronics Corporation Electron gun system providing for control of convergence, astigmatism and focus with a single dynamic signal
US4883437A (en) * 1988-06-29 1989-11-28 Rca Licensing Corp. Method for spot-knocking an electron gun mount assembly of a crt utilizing a magnetic field
US4883438A (en) * 1988-06-29 1989-11-28 Rca Licensing Corp. Method for spot-knocking an electron gun mount assembly of a CRT
EP0361455A2 (en) * 1988-09-28 1990-04-04 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
EP0361455A3 (en) * 1988-09-28 1992-12-30 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
US5036258A (en) * 1989-08-11 1991-07-30 Zenith Electronics Corporation Color CRT system and process with dynamic quadrupole lens structure
US5055749A (en) * 1989-08-11 1991-10-08 Zenith Electronics Corporation Self-convergent electron gun system
US5043625A (en) * 1989-11-15 1991-08-27 Zenith Electronics Corporation Spherical aberration-corrected inline electron gun
US5486735A (en) * 1992-11-02 1996-01-23 Kabushiki Kaisha Toshiba Electron gun with improved withstand voltage for color-picture tube
US5449983A (en) * 1993-04-20 1995-09-12 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
US5517078A (en) * 1993-05-14 1996-05-14 Kabushiki Kaisha Toshiba Color cathode ray tube apparatus
CN1052560C (zh) * 1993-05-14 2000-05-17 东芝株式会社 彩色显像管
US6259195B1 (en) * 1994-08-25 2001-07-10 U.S. Philips Corporation Cathode ray tube provided with an electron gun, and electrostatic lens system
US5939820A (en) * 1995-07-28 1999-08-17 Lg Electronics Inc. Electron gun with focusing electrode having a curved surface
US6147447A (en) * 1997-06-13 2000-11-14 Thomson Tubes Electroniques Electronic gun for multibeam electron tube and multibeam electron tube with the electron gun
US6194823B1 (en) 1997-07-15 2001-02-27 Hitachi, Ltd. Color cathode ray tube having adjustment magnet assembly at the neck portion of the tube
EP0892421A1 (en) * 1997-07-15 1999-01-20 Hitachi, Ltd. Color cathode ray tube
US6335589B2 (en) 1997-07-15 2002-01-01 Hitachi, Ltd. Color cathode ray tube having adjustment magnet assembly at neck portion
US6239542B1 (en) * 1998-05-11 2001-05-29 U.S. Philips Corporation Cathode ray tube having an electron gun with magnetic elements
FR2806526A1 (fr) * 2000-03-14 2001-09-21 Samsung Sdi Co Ltd Canon a electrons et tube cathodique en couleur muni de celui-ci
US20040140751A1 (en) * 2001-06-01 2004-07-22 Van Der Vaart Nijs Cornelis Display tube and display device

Also Published As

Publication number Publication date
JPS4882770A (ja) 1973-11-05
JPS52100971A (en) 1977-08-24
PL83625B1 (ja) 1975-12-31
NL7300483A (ja) 1973-07-17
DE2223369B2 (de) 1977-12-01
KR780000391B1 (en) 1978-10-04
JPS52132670A (en) 1977-11-07
DD103093A5 (ja) 1974-01-05
CS199546B2 (en) 1980-07-31
JPS557659B2 (ja) 1980-02-27
JPS557658B2 (ja) 1980-02-27
AR196104A1 (es) 1973-11-30
GB1381018A (en) 1975-01-22
BE793992A (fr) 1973-05-02
DE2223369C3 (de) 1981-04-16
JPS5232714B2 (ja) 1977-08-23
FR2167898B1 (ja) 1976-05-14
RO78240A (ro) 1982-04-12
ZA73216B (en) 1973-12-19
IT973241B (it) 1974-06-10
JPS524905B2 (ja) 1977-02-08
NL184445C (nl) 1989-07-17
NL184445B (nl) 1989-02-16
JPS51118958A (en) 1976-10-19
BR7300153D0 (pt) 1973-09-27
SU495851A3 (ru) 1975-12-15
CA969597A (en) 1975-06-17
DE2223369A1 (de) 1973-07-19
ES410383A1 (es) 1975-12-01
FR2167898A1 (ja) 1973-08-24

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