US3696261A - Cathode ray tube with plural beams for each color element - Google Patents

Cathode ray tube with plural beams for each color element Download PDF

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Publication number
US3696261A
US3696261A US66283A US3696261DA US3696261A US 3696261 A US3696261 A US 3696261A US 66283 A US66283 A US 66283A US 3696261D A US3696261D A US 3696261DA US 3696261 A US3696261 A US 3696261A
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beams
central
groups
apertures
group
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Senri Miyaoka
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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
    • 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

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  • ABSTRACT 30 Foreign Application Priority Data color picture or cathode ray tube is provided with a single-gun generating a plurality of groups of electron Aug. 23, 1969 Japan ..44/66582 beams which are n focused on the color phosphor screen by a common electron lens with all of the [52] US. Cl.
  • This invention relates generally to color picture or cathode ray tubes of the single-gun, plural-beam type, and particularly to tubes of that type in which the plural beams are passed through the optical center of a common electron lens by which the beams are focused on the color phosphor screen.
  • pairs of convergence deflecting plates Arranged along such divergent paths are pairs of convergence deflecting plates having voltages applied thereacross to laterally deflect the divergent side beams in a substantially horizontal plane for causing all beams to converge at a point on the apertured beam selecting grid or shadow mask associated with the color screen.
  • the outer or side beams After passing through an aperture of the grid or mask, the outer or side beams again diverge from the central beam and the three beams impinge on respective color phosphors arranged in arrays or sets forming repetitive patterns on the color screen.
  • a single electron beam is provided for exciting the color phosphors of each color.
  • the central beam may excite the green phosphors, while the outer or side beams excite the red and blue phosphors, respectively.
  • the brightness of the picture formed on the screen is dependent on the beam current in each of the three electron beams impinging on the respective color phosphors. If an attempt is made to increase the brightness of the color picture by increasing the beam current or current density in each electron beam, there is a resulting increase in the diameter of each electron beam at a cross-over point thereof, and the consequent increase in the diameter of the beam spot formed by each beam on the screen causes deterioration of the resolution of the picture.
  • Another object is to provide a color picture tube of the single-gun, plural-beam type in which the brightness of the picture is increased without undesirably increasing the beam current density, and hence without deterioration of the picture resolution.
  • an extremely bright picture is achieved with a single-gun, plural beam color picture tube in which the single gun generates a plurality of groups of electron beams, and in which the beams of each group have a common landing spot on the screen so as to simultaneously excite respective color phosphors of the screen.
  • three laterally spaced apart groups of vertically spaced electron beams are emitted by a beam generating assembly.
  • the beams of the central group lie in a vertical plane containing the optical axis of a single main electron focusing lens by which all of the beams are focused on the screen, and the beams in such vertical plane are converged, as by an auxiliary electron lens, so as to cross each other substantially at the optical center of the main lens.
  • the beams of the outer or side groups lie in respective vertical planes which are laterally converged, as by the auxiliary electron lens, to intersect substantially at the optical center of the main lens, and the beams of each side group are converged in the respective vertical plane, once again by the auxiliary lens, so as to cross each other substantially at the mentioned optical center.
  • all of the beams pass through the center of the main electron lens for focusing thereby on the screen without significant coma or spherical aberration.
  • Beams of the central and side groups emerge from the main electron lens along vertically divergent paths lying in respective vertical planes, and the planes containing the emergent beams of the side groups diverge laterally from the plane containing the emergent beams of the central group.
  • vertical and horizontal convergance deflecting devices Arranged between themain electron lens and the apertured beam selecting grid are vertical and horizontal convergance deflecting devices which respectively operate to vertically converge the beams of each group to a common landing spot on the color screen and to horizontally converge the beams of the side groups with the beams of the central group at a common vertical line on the beams selecting grid.
  • FIG. 1 is a schematic, horizontal sectional view through the axis of a color picture tube according to an embodiment of this invention
  • FIG. 2 is a transverse sectional view taken along the line 2-2 on FIG. 1;
  • FIG. 3 is a sectional view similar to that of FIG. 1, but taken in a vertical plane including the tube axis;
  • FIGS. 4 and 5 are diagrammatic views illustrating the optical equivalent or analogy of the tube according to this invention as shown by FIGS. 1 and 3, respectively;
  • FIGS. 6 and 7 are views similar to FIGS. 1 and 3, respectively, but showing another embodiment of this invention.
  • FIG. 8 is a sectional view taken on the line 88 on FIG. 6;
  • FIG. 9 is an end view of a magnetic deflection device that may be employed for horizontally converging the beams in the tubes according to this invention.
  • a single-gun, pluralbeam color picture tube 10 in accordance with this invention is then shown to comprise a glass envelope 11 (indicated in broken lines) having a neck 12 and cone 13 extending from the neck to a face plate carrying a color screen S made up of the usual arrays or sets of color phosphors S 5 and S and with an apertured beam selecting grid or grill A disposed in back of the screen and spaced a small distance therefrom.
  • a color screen S made up of the usual arrays or sets of color phosphors S 5 and S and with an apertured beam selecting grid or grill A disposed in back of the screen and spaced a small distance therefrom.
  • an electron gun A Disposed within neck 12 is an electron gun A having cathodes K K and K which constitute beamgenerating sources having the respective beamgenerating surfaces disposed as shown in a plane which is substantially perpendicular to the axis of the electron gun A.
  • the beam generating surfaces of cathodes K K and K are vertically elongated and the cathode K is centered on axis of the gun while the cathodes K and K are spaced laterally or horizontally from cathode K at opposite sides of the latter.
  • a first grid G is spaced axially from the beamgenerating surfaces of cathodes K K and K and has paired apertures h and h,,;, h and/1' and h and 11' formed therein.
  • the apertures of each pair are vertically spaced apart so as to be symmetrically disposed above and below a horizontal plane containing the axis of gun A. Further, the pairs of apertures h and h' h,,,- and h and h and 11' are laterally spaced apart so as to be in alignment axially with the beam generating surfaces of cathodes K K and K respectively (FIG. 2).
  • a common grid G is spaced from the first grid G and has paired apertures h and h' h and h and I1 and 11' formed therein in alignment with the similarly numbered apertures of the first grid G
  • Successively arranged in the axial direction away from the common grid G are open-ended, tubular grids or electrodes G G and G respectively, with cathodes K K and K grids G and G and electrodes G G and G being maintained in the depicted, assembled positions thereof, by suitable, non-illustrated support means of an insulating material.
  • a voltage of to minus 400V is applied to the grid G
  • a voltage of 0 to 500V is applied to the grid G
  • a voltage of 13 to ZOKV is applied to the electrodes G and G
  • a voltage of O to 400 V is applied to the electrode G with all of these voltages being based upon the cathode voltage as a reference.
  • the voltage distributions between the respective electrodes and cathodes, and the respective lengths and diameters thereof, may be substantially identical with those of the unipotential-single beam type electron gun which is constituted by a single cathode and first and second, single-apertured grids.
  • an electron lens field will be established between grid G and the electrode G to form an auxiliary lens L as indicated in dashed lines, and an electron lens field will be established around the axis of electrode G by the electrodes G G and G to form a main lens'L again as indicated in dashed lines.
  • bias voltages of 100V, 0V, 300V, ZOKV, 200V and 20V may be applied respectively to the cathodes K K and K the first and second grids G, and G and the electrodes G G, and G
  • electrons emitted from the beam generating surfaces of cathodes K K and K are formed into paired electron beams B and B B and B' and B and B' passing through the paired apertures It and h',,,, I1 and /1, and It, and 12' of grid G.
  • the beams B and B' emerge from grid G, in parallel, vertically spaced paths lying in a vertical plane that contains the axis of gun A, and the beams B and 8' and the beams B and B emerge from grid G in parallel vertically spaced paths lying in respective vertical planes that are symmetrically spaced from the vertical plane containing beams 8 and B' at opposite sides of the latter.
  • the beams B B and B and the beams B B and B',;, when emerging from grid G lie in respective horizontal planes that are disposed symmetrically above and below the horizontal plane containing the axis of gun A.
  • the central beams B and B are converged in the vertical plane containing the axis of gun A, and the side beams B and B,, and side beams B and 8' are similarly converged vertically in their respective planes and simultaneously the latter planes are converged horizontally so that all of the beams will pass through main lens L and hence cross each other, substantially at the optical center of the main lens.
  • the central beams 8,,- and B' will dimerge vertically from each other in a vertical plane containing the axis of gun A, and the side beams B and B,,, and B and B,; will diverge vertically from each other in respective vertical planes which diverge horizontally from the plane containing central beams B and 8' at opposite sides of the latter.
  • the electron gun A further comprises vertical convergence deflecting means C, which, as shown on FIG. 5, acts on all of the veams after emergence of the latter from main lens L to upwardly deflect beams B 8 and B and to downwardly deflect beams B',;, 8' and B' As shown on FIGS.
  • the vertical convergence deflecting means C may include a central plate P extending axially between electrode G and grid or grill A and lying in a horizontal plane containing the gun axis, and deflector plates O and Q which are spaced from plate P, above and below the latter to permit the passage of beams 8' 8' and B 6 between plates P, and Q and to permit the passage of beams B B and B between plates F,, and Q
  • the deflector plates Q and Q35 have negative charges with respect to the central plate P, therebetween so that the resulting electric fields traversed by the beams will convergently deflect the beams B B and B and the beams 8' 8' and B,,.
  • a voltage V which is equal to the voltage applied to the electrode G may be applied to central plate P, and a voltage V which is some 200 to 300V lower than the voltage V is applied to the deflector plates QAS and Q85 to result in the application of a deflecting voltage difference or convergence deflecting voltages V between the plates P, and O and it is, of course, this convergence deflecting voltage V which will impart the requisite convergent deflection to the respective electron beams B 3 and B and 8' B and B',,.
  • the gun A further comprises horizontal convergence deflecting means C which include vertical shielding plates P and P disposed in the depicted spaced, relationship at opposite sides of the gun axis between deflecting means C and grill A and axially extending, vertical deflector plates 0,, and Q which are disposed, as shown, in outwardly spaced, opposed relationship to shielding plates P and P respectively.
  • horizontal convergence deflecting means C which include vertical shielding plates P and P disposed in the depicted spaced, relationship at opposite sides of the gun axis between deflecting means C and grill A and axially extending, vertical deflector plates 0,, and Q which are disposed, as shown, in outwardly spaced, opposed relationship to shielding plates P and P respectively.
  • the deflector plates Q 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 and disposed so that the central electron beams B and B' will pass substantially undeflected between the shielding plates P and P while the deflector plates Q and Q have negative charges with respect to plates P and P, so the respective electron beams B and B,,, And B and B R will be convergently deflected, as shown on FIG. 1, by the respective passages thereof between the plates P and Q and between the plates P and Q More specifically, the voltage V which is equal to that applied to electrode G and is applied to central plate P, of deflecting means C,, may also be applied to shielding plates P and P while the voltage applied to deflector plates 0,, and O is some 200 to 300 V.
  • the apertured grill A has its apertures in the form' of vertical extending slits.
  • each set or array of color phosphors associated with a slit of grill A if composed of vertically extending red, green and blue phosphor stripes S S and S and, of course, such stripes are applied in a repetitive pattern across screen S.
  • each phosphor stripe is excited or energized at a spot thereon to provide very intense or bright illumination at such spot without unduly increasing the beam current in any of the electron beams.
  • the diameter of the landing spot of each pair of beams on the respective phosphor stripe can be kept desirably small to ensure that the resulting color picture will have good resolution.
  • all of the electron beams are made to simultaneously scan the face of screen S in a conventional manner, for example, by horizontal and vertical deflection yoke means (not shown) disposed around neck 12 and which receives horizontal and vertical sweep signals. Since, with the described arrangement, all of the electron beams are passed, for focussing through the center of the main lens L of electron gun A, the beam spots formed by impingement of the beams on color phosphor screen S will be substantially free from the effects of coma and/or astigmatism of said main lens, whereby color picture resolution of a high order will be provided.
  • each of the phosphor stripes S 8 and S is excited or merged by a pair of respective electron beams having a common landing sport on the corresponding stripe.
  • a color picture tube may be provided with a single electron gun which generates more than two beams for each color phosphor, with all of the beams corresponding to each color being converged to a common landing spot on the screen. For example, as shown of FIGS.
  • an electron gun A may provide trios of electron beams B B' and B",,, B B' and B" and B B' and B,, for energizing the phosphor stripes S S and S respectively, with the beams of each trio being converged to a common landing spot on the respective phosphor stripe.
  • the gun A is generally similar to the previously described gun A, and differs therefrom in respect to the arrangement of apertures in grids G, and G and the construction of the vertical convergence deflection means C' More specifically, grid G, of gun A is seen to have trios of apertures h h' and h",,,, h h' and h and h [1' and h,,, arranged along laterally spaced apart vertical lines which are in alignment with the beam generating surfaces of cathodes K K and K respectively.
  • the apertures h h' and h are arranged along a horizontal line extending through the axis of gun A, and the apertures h h and h and the apertures h h", and h",,, are arranged along respective horizontal lines which are disposed above and below, respectively, the gun axis and symmetrically spaced from the latter.
  • the grid G of gun A has trios of apertures '12", hg and h hag, h gg and h gs, and hug, h gg and h" which are in axial alignment with the similarly identified apertures in grid G With the arrangement of the apertures in grids G, and G as described above with reference to FIGS.
  • the several beams, upon emerging from the apertures in grid G traverse the electric field constituting the auxiliary lens L and, with the exception of the beam B' are deflected thereby is that all of the beams will cross each other substantially at the optical center of the main focusing lens L More specifically, the beam B' lying in the axis of gun A is not deflected in passing through lens L whereas the other central beams B and 8",; are converged in the vertical plane containing the axis of gun A.
  • the side beams B and 8",, and the side beams B and 8",, are similarly deflected vertically in their respective vertical planes to converge with the beams B',, and B,, respectively.
  • the trio of beams B B R and B" and the trio of beams B B' and B", are deflected horizontally in passing through lens L, to converge with the plane of central beams B 8' and B,;, so that all of the beams will cross each other substantially at the optical center of main lens L In emerging from main lens L,, the central beam B',; will lie along the axis of gun A and central beams 8 and 8",; will diverge vertically therefrom in avertical plane containing the axis.
  • the side beams B B',, and B",, and the side beams B,,, B, and B", will diverge from each other in respective vertical planes which diverge horizontally from the vertical plane containing beams 13, B' and B",;, with the side beams B',, and B',, lying in a horizontal plane that contains beam B',;.
  • the gun A further comprises vertical convergence deflecting means C S which replaces the vertical convergence deflecting means C of FIGS. 1 and 3.
  • the convergence deflecting means C S of gun A may be generally similar to the previously described horizontal convergence deflecting means C of gun A, but is arranged with its shielding plates P and P and its deflecting plates O and Q lying in respective horizontal planes.
  • shielding plates P and P are equally charged so that beams 8' 8' and B',, passing therebetween are not deflected, while deflector plates 0,, and Q have negative charges with respect to plates P and P for example, 200 to 300 V. less than the latter, to provide electric fields between plates P and O and between plates P and Q85 by which beams B",,, 8",; and 3",, and beams B,,, B and 8,, are deflected downwardly and upwardly, respectively.
  • the gun A further comprises horizontal convergence deflecting means C which may be the same as the deflecting means C of FIGS. 1 and 3.
  • the central beams B 8' and 8 are substantially undeflected in passing between the shielding plates 1, and P which are at the same potential.
  • beams B,,, B',, and B",, and beams B B',, and 8",, in passing between plates P and Q, and between plates P and Q, respectively, are horizontally deflected, as shown on FIG.
  • each such deflecting means C of the electrostatic type may be replaced by one of a magnetic type, for example, as illustrated in FIG. 9.
  • the deflecting means C of the magnetic type is shown to include a magnetic shield member 14 which may be in the form of a tube of rectangular cross-section arranged axially after the vertical convergence deflecting means C or C' so as to permit the passage therethrough of the central beams B and B (as shown) or the central beams B 8' and B
  • a magnetic shield member 14 which may be in the form of a tube of rectangular cross-section arranged axially after the vertical convergence deflecting means C or C' so as to permit the passage therethrough of the central beams B and B (as shown) or the central beams B 8' and B
  • Extending from adjacent one side 14a of shield member 14 are two magnetic plates 15a and 15b which are in opposing, spaced relation to each other so as to permit the passage therebetween of beams B and B or beams B B and B"
  • a similar pair of magnetic plates 16a and 16b extend from the other side 14b of shield member 14 to permit the passage therebetween of beams B and B, or beams B
  • plates 15a and 15b are bent away from each other to form magnetic poles 17a and 17b extending along the inner wall surface of the tube neck 12, and the outer edge portions of plates 16a and 16b are similarly bent to form poles 18a and 18b extending along the inner surface of neck 12.
  • electromagnets 19a and 19b respectively including windings 20a and 20b on cores 21a and 21b which have pole portions in opposing relationship to the poles 17a and 17b and the poles 18a and 18b, respectively.
  • the beams B and B' are not horizontally deflected since they are shielded by member 14 from the external magnetic field established by convergence current flows in windings 20a and 20b.
  • beams B and B', and beams B and B', are horizontally deflected toward beams B and B' by reason of the magnetic flux distributions between plates 15a and 15b and plates 16a and 16b, respectively.
  • a cathode ray tube comprising an electron receiving screen having sets of different color phosphors arranged in a repetitive pattern and each including a central color phosphor and two other color phosphors at opposite sides of said central color phosphor considered in one direction parallel to the plane of said screen; beam selecting means spaced from said screen and having apertures each corresponding to a respective one of said sets of color phosphors; and electron gun means including cathode means emitting electrons, first and second grid means arranged successively in adjacent opposing relation to said cathode means and having aligned apertures for passing electrons from said cathode means in respective electron beams directed toward said screen, each of said first and second grid means having a central group of apertures to define a central beam group for impingement on said central color phosphor of said color phosphor sets and two side groups of apertures spaced symmetrically in said one direction from said central aperture group at opposite sides of the latter to define respective side beam groups for impingement on said other color phosphors at respective sides of
  • a cathode ray tube in which said apertures in said first and second grid means have spacings from each other in said second grid means that are equal to the spacings therebetween in said first grid means so that said beams are directed parallel to each other by the respective apertures of said grid means, said focusing lens means has an optical center on said optical axis, and an auxiliary lens means is interposed between said grid means and said focusing lens means for deflecting those electron beams which are spaced from said optical axis in passing through said apertures of the grid means so that all of said beams intersect substantially at said optical center of the focusing lens means.
  • a cathode ray tube in which each of said groups of apertures consists of two apertures to provide two beams in each of said groups thereof.
  • each of said groups of apertures consists of three apertures spaced apart equally in said other direction to said side ou s of beams, said deflectin lates bei at an ele iric l potential different from Fhat of said shielding plates to electrostatically deflect each of said side groups of beams in the direction toward said central group of beams.
  • a cathode ray tube in which said other section of the beam deflecting means includes a tubular magnetic shield arranged along said optical axis for the passage therethrough of said central beam group, pairs of spaced magnetic plates extending outwardly from opposed sides of said shield for the passage between each of said pairs of magnetic plates of a respective one of said side beams groups, and magnet means operatively associated with said pairs of magnetic plates to establish, between each pair of plates, a magnetic field for deflecting the respective side beam group toward said central beam group.
  • a cathode ray tube according to claim 2 in which there are two beams in each of said-beam groups, and
  • said one section of the beam deflecting means includes a central plate extending in said one direction through said optical axis, and deflecting plates spaced in said other direction from said central plate for the passage therebetween of a respective beam from each of said groups, said deflecting plates being at an electrical potential different from that of said central plate to electrostatically deflect the two beams in each group toward each other.
  • a cathode ray tube in which there are three beams in each of said groups with one of said three beams lying in a plane that extends in said one direction through said optical axis and the other two of said three beams lying in planes that are oppositely spaced in said other direction from said plane of the central beam, and said one section of the beam deflecting means includes a pair of shielding plates at equal electrical potential disposed in planes extending in said one direction and oppositely spaced in said other direction from said optical axis for the passage between said shielding plates of said central beam of each group, and deflecting plates spaced from said shielding plates for the passage therebetween of said other two beams of each group, said deflecting plates being at an electrical potential different from that of said shielding plates to electrostatically deflect each of said other two beams of each group toward the central beam of the respective group.

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US66283A 1969-08-23 1970-08-24 Cathode ray tube with plural beams for each color element Expired - Lifetime US3696261A (en)

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JP44066582A JPS4919349B1 (de) 1969-08-23 1969-08-23

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US (1) US3696261A (de)
JP (1) JPS4919349B1 (de)
DE (1) DE2041912A1 (de)
FR (1) FR2062151A5 (de)
GB (1) GB1278235A (de)
NL (1) NL169247C (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044282A (en) * 1974-10-17 1977-08-23 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4142133A (en) * 1976-10-20 1979-02-27 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4393329A (en) * 1980-01-08 1983-07-12 Zenith Radio Corporation Article of manufacture for projection television system
US4415348A (en) * 1980-05-29 1983-11-15 Zenith Radio Corporation Method of manufacture for projection television system
US4469987A (en) * 1981-10-23 1984-09-04 Zenith Electronics Corporation Means for enhancing brightness of a monochrome CRT without loss of resolution
US5418421A (en) * 1991-11-14 1995-05-23 Sony Corporation Cathode-ray tube with electrostatic convergence electrode assembly
US20020089277A1 (en) * 2001-01-11 2002-07-11 Thomas Skupien Beam forming region having an array of emitting areas
US20040090165A1 (en) * 2001-03-13 2004-05-13 Hirokazu Takuma Electron gun,cathode-ray tube and projector

Citations (4)

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Publication number Priority date Publication date Assignee Title
US2721287A (en) * 1951-09-26 1955-10-18 Rca Corp Multiple beam gun
US2735031A (en) * 1951-02-15 1956-02-14 woodbridge
US3065295A (en) * 1958-12-24 1962-11-20 Gen Electric Electron beam system
US3448316A (en) * 1967-01-14 1969-06-03 Sony Corp Cathode ray tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB469127A (en) * 1936-01-30 1937-07-20 Erich Kinne Method of producing television pictures by means of electric discharge tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735031A (en) * 1951-02-15 1956-02-14 woodbridge
US2721287A (en) * 1951-09-26 1955-10-18 Rca Corp Multiple beam gun
US3065295A (en) * 1958-12-24 1962-11-20 Gen Electric Electron beam system
US3448316A (en) * 1967-01-14 1969-06-03 Sony Corp Cathode ray tube

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044282A (en) * 1974-10-17 1977-08-23 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4142133A (en) * 1976-10-20 1979-02-27 Balandin Genrikh D Cathode-ray tube with variable energy of beam electrons
US4393329A (en) * 1980-01-08 1983-07-12 Zenith Radio Corporation Article of manufacture for projection television system
US4415348A (en) * 1980-05-29 1983-11-15 Zenith Radio Corporation Method of manufacture for projection television system
US4469987A (en) * 1981-10-23 1984-09-04 Zenith Electronics Corporation Means for enhancing brightness of a monochrome CRT without loss of resolution
US5418421A (en) * 1991-11-14 1995-05-23 Sony Corporation Cathode-ray tube with electrostatic convergence electrode assembly
US20020089277A1 (en) * 2001-01-11 2002-07-11 Thomas Skupien Beam forming region having an array of emitting areas
US20040090165A1 (en) * 2001-03-13 2004-05-13 Hirokazu Takuma Electron gun,cathode-ray tube and projector

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Publication number Publication date
GB1278235A (en) 1972-06-21
JPS4919349B1 (de) 1974-05-16
DE2041912A1 (de) 1971-03-04
NL169247C (nl) 1982-06-16
NL7012445A (de) 1971-02-25
FR2062151A5 (de) 1971-06-25
NL169247B (nl) 1982-01-18

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