Plural Magnetic Patents (Class 313/431)
  • Patent number: 10541110
    Abstract: A multi-beam apparatus for observing a sample with high resolution and high throughput and in flexibly varying observing conditions is proposed. The apparatus uses a movable collimating lens to flexibly vary the currents of the plural probe spots without influencing the intervals thereof, a new source-conversion unit to form the plural images of the single electron source and compensate off-axis aberrations of the plural probe spots with respect to observing conditions, and a pre-beamlet-forming means to reduce the strong Coulomb effect due to the primary-electron beam.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: January 21, 2020
    Assignee: ASML Netherlands B.V.
    Inventors: Shuai Li, Weiming Ren, Xuedong Liu, Juying Dou, Xuerang Hu, Zhongwei Chen
  • Patent number: 8378312
    Abstract: A variety of systems, apparatus and methods for deflecting a particle beam are described. An apparatus comprises at least six electromagnetic portions disposed on a plane. Each of the at least six electromagnetic portions is aligned with a radius emanating from an axis normal to the plane and is distanced from the axis to form a volume about the axis. At least six coils are configured for affecting a dipole magnetic field in the volume in response to electrical currents applied to physically opposing coils where a particle beam entering the volume is deflected. Each of the at least six coils is disposed about a one of the at least six electromagnetic portions. A yoke structure is configured for returning a generated magnetic flux.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: February 19, 2013
    Assignee: Pyramid Technical Consultants, Inc.
    Inventors: John Gordon, Raymond Paul Boisseau, Andrew Dart
  • Patent number: 7759852
    Abstract: A cathode ray tube in which a VM effect is maximized in a slim-type cathode ray tube having a short electric field in an anteroposterior direction. The cathode ray tube includes a panel having a fluorescent surface provided to raise colors, a shadow mask provided behind the fluorescent surface, a funnel connected to the rear portion of the panel to provide with an inner portion as an airtight space, an electron gun formed at the rear portion of the funnel for emitting an electron beam, a deflection yoke equipped outside of a neck portion of the funnel to deflect the electron beam, and a VM coil portion of which at least a portion inserted in an interval between the deflection yoke and the funnel to apply an electric field to the electron beam.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: July 20, 2010
    Assignee: LG Electronics Inc.
    Inventor: Cha Joon Geol
  • Patent number: 7385341
    Abstract: A plurality of magnet rings for correcting a convergence are arranged in a tube axis direction with spacers interposed therebetween, on an outer circumferential surface of a neck. A velocity modulation coil for modulating a scanning velocity in a horizontal direction of an electron beam is placed so that a position of the velocity modulation coil in the tube axis direction is overlapped with those of the magnet rings. At least one of the spacers is made of only a magnetic substance. Alternatively, at least one of the spacers is made of a magnetic substance, and the outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material. Because of this, the magnetic field formed by the velocity modulation coil can be intensified without disturbing the magnetic field of the magnet rings of a CPU.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: June 10, 2008
    Assignee: Matsushita Toshiba Picture Display Co., Ltd.
    Inventors: Koji Nishiyama, Hiroji Morimoto, Akira Satou, Katsuyo Iwasaki, Kenichiro Taniwa
  • Patent number: 7227300
    Abstract: A projection tube apparatus includes: a valve made up of a face panel having a screen face on its external face, a funnel connected to a rear portion of the face panel, and a neck portion; an electron gun that emits an electron beam and is housed in the neck portion; and a deflection device mounted at an outer circumference of the funnel on the neck portion side. The deflection device at least includes: horizontal deflection coils that generate a horizontal deflection field for deflecting the electron beam in the horizontal direction; vertical deflection coils that generate a vertical deflection field for deflecting the electron beam in the vertical direction and is disposed outside the horizontal deflection coils; and a ferrite core disposed outside the vertical deflection coils. A distance Ls between an end portion of the horizontal deflection coils on the screen face side and the screen face is set to 55 mm?Ls?80 mm.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: June 5, 2007
    Assignee: Matsushita Toshiba Picture Display Co., Ltd.
    Inventors: Takahiko Yoshinaga, Kenichiro Taniwa
  • Patent number: 7015634
    Abstract: A pair of magnets of which magnetizing direction differs from each other in the horizontal direction (X axis) are arranged at upper and lower portions of a funnel-side opening portion of a deflection yoke. The pair of magnets are held and fixed to a coil support body which supports horizontal deflection coils in a state where the magnets are embedded in the coil support body. In a projection type cathode ray tube of a single electron beam method, a locus of an electric beam which receives the deflection distortion is corrected so as to correct an electron beam shape on a screen to an approximately circular shape whereby a focusing performance of a display image on a screen is enhanced.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: March 21, 2006
    Assignee: Hitachi Displays, Ltd.
    Inventors: Sakae Watanabe, Katsumi Hirota
  • Patent number: 6924590
    Abstract: A color picture tube device has a funnel glass, a pair of horizontal deflection coils, an insulating frame, and a pair of vertical deflection coils. The pair of horizontal deflection coils are opposed to each other in a vertical direction around the outer surface of the funnel glass, and each have a window at the center. The insulating frame covers the horizontal deflection coils, resembles in shape a part of the funnel glass where the horizontal deflection coils are provided, and has openings in areas corresponding to windows of the horizontal deflection coils. The pair of vertical deflection coils are opposed to each other in a horizontal direction around the outer surface of the insulating frame, without overlapping the openings. A pair of correction coils are provided so as to be each at least partially inserted in a different one of the openings.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: August 2, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuji Tagami, Hiroshi Sakurai
  • Patent number: 6888325
    Abstract: Disclosed is a method for correcting inner pin distortion generated in the CRT product and deflection yoke thereof. According to the disclosed method and deflection yoke thereof, the additional circuit for suppressing inner pin distortion phenomenon on the screen is not required as the related art, reduction in manufacturing costs is possibly achieved. Also, as the circuit for suppressing pincushion is not used, power dissipation could be reduced, and instability in dispersion and characteristics of a pin in the middle portion due to increase of dispersion generation by a wiring of a coil could be resolved.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: May 3, 2005
    Assignee: Samsung Electro-Mechanics Co., Ltd
    Inventors: Yun Ki Hong, Hwan Seok Choe, Gong Hee Park
  • Publication number: 20040004426
    Abstract: The present invention therefore relates to a colour picture tube and a deflection system for a colour picture tube comprising a rectangular fluorescent screen and an in-line electron beam generator system. An in-line electron beam generator system generates a plurality of electron beams which essentially extend in a common plane and which are directed onto the fluorescent screen. For correcting an east-west inward pincushion distortion, convergence magnets are arranged in a first plane on the colour picture tube and in the deflection system of a colour picture tube, respectively, and geometry magnets are arranged in a second plane which is different from said first plane. The planes of the convergence magnets and of the geometry magnets are each oriented perpendicular to the direction of the electron beams.
    Type: Application
    Filed: June 3, 2003
    Publication date: January 8, 2004
    Applicant: Matsushita Display Devices (Germany) GmbH
    Inventor: Andreas Ehrhardt
  • Patent number: 6674230
    Abstract: A cathode ray tube includes an electron gun directing electrons away from a faceplate having an electrode biased at screen potential. One or more electromagnets located on or near the rear wall of the tube envelope are biased with dc currents so that the electron beam (three beams in a color tube) is deflected by the magnetic field produced thereby to impinge upon the faceplate. The electron beam is magnetically deflected over a relatively small angle as it exits the electron gun to scan across the faceplate to impinge upon phosphors thereon to produce light depicting an image or information. The electromagnet closest the electron gun is typically biased to produce a strong magnetic field to deflect electrons to the faceplate near to the electron gun. The electromagnets more distant the electron gun produce magnetic fields to direct electrons towards the faceplate, with the electromagnet most distant the electron gun deflecting the electrons to tend to increase the landing angle thereof on the faceplate.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: January 6, 2004
    Assignee: Sarnoff Corporation
    Inventors: Joseph Michael Carpinelli, Dennis John Bechis, George Herbert Needham Riddle
  • Patent number: 6653776
    Abstract: The present invention relates generally to a new dielectric forming metal/ceramic laminate magnet and process thereof. More particularly, the invention encompasses a new process for fabrication of a large area laminate magnet with a significant number of holes, integrated dielectric forming metal plate(s) and electrodes for electron and electron beam control. The present invention also relates to a magnetic matrix display and electron beam source and methods of manufacture thereof.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: November 25, 2003
    Assignee: International Business Machines Corporation
    Inventors: Govindarajan Natarajan, John U. Knickerbocker, Srinivasa S. N. Reddy, Rao V. Vallabhaneni
  • Patent number: 6635985
    Abstract: A magnetic matrix display device has a grid electrode in which differing first grid (G1) and second grid (G2) apertures are used. A sensor element and a second grid electrode are combined as a single structure. Other aspects of the invention relate to a deflection anode having reduced capacitance, the use of a polyimide coating for the grid electrodes, the use of a compliant mounting and adjustment for a grid assembly and the provision of an illuminated border on a magnetic matrix display.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: October 21, 2003
    Assignee: International Business Machines Corporation
    Inventors: John Stuart Beeteson, Andrew Ramsay Knox, Christopher Carlo Pietrzak
  • Patent number: 6630777
    Abstract: A color cathode-ray tube includes a housing including a panel having a phosphor screen on its inside and a funnel fastened to the panel, the funnel including a neck portion; an electron gun housed in the neck portion and emitting electron beams for exciting the phosphor screen and forming an image, the electron gun including cathodes arranged in line, electrodes sequentially disposed from the cathodes and having electron beam passages for passing three electron beams, a shield cup coupled to a last electrode among the electrodes and provided with three electron beam passages in line, and magnetic pieces disposed on the shield cup or one or more electrodes so that the center of a coma correction portion composed of the magnetic pieces is positioned above and below the line and in spaces between the center of a central electron beam passage and the centers of side electron beam passages; and a deflection yoke disposed on the neck and cone portions of the funnel, the deflection yoke deflecting electron beams emi
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: October 7, 2003
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Yong-geol Kwon, Young-jun Yoon, Deog-ho Kim, Yang-je Lee, Kwang-jin Yun
  • Patent number: 6617779
    Abstract: Roughly described, a CRT contains a magnetic loop bender which causes the beam to undergo a 270° (for example) bend and intersect itself before exiting the bender orthogonally with the screen. Downstream of the bender, the beam is deflected by conventional biaxial scanning means before impingement on the screen. A magnetic field stop plate can be added in a plane that passes through the beam intersection point and that lies parallel to the pole termination plane of the bender magnetic structure. An astigmatic beam shaping mechanism can also be included, as can post-deflection acceleration of the beam to provide further shortening of the tube depth as well as a focusing action that reduces the effect of beam enlargement due to mutual electron repulsion within the beam. All of the beam bending and deflection can be done by externally attached components.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: September 9, 2003
    Inventor: Samuel A. Schwartz
  • Patent number: 6586893
    Abstract: A device for correcting residual mis-convergence errors in a color cathode ray tube, the tube including a narrow-necked section, located at the rear thereof, in which electron guns mounted therein generate forwardly-directed red, blue and green electronic beams, an outwardly-opening center skirt section, extending forward from the narrow-necked section, and terminating in a wide perimeter surrounding a relatively flat, pixel-coated, viewing screen section that is arranged generally orthogonal to the axis of the narrow-necked section and upon which the electronic beams are directed to strike the pixels to produce color and images for viewing from the front of the tube, and further having at least one pair of electromagnetic coils mounted outside the tube, for initial focusing of the electron beams during their travel from the guns to the screen, the device including a separator made of a plastic, including a high density of magnetizable particles therein, the separator arranged for placement about the outside
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: July 1, 2003
    Inventor: Song O Shik
  • Patent number: 6563259
    Abstract: A deflection yoke of Braun tube having a horizontal deflection coil for horizontally deflecting electron beams radiated from an electron gun, a vertical deflection coil for vertically deflecting the electron beams, and a holder inserted between the horizontal and the vertical deflection coils for mechanically fixing them and electrically insulating them, including: an auxiliary coil having a first deflection portion coil extendedly formed from a ‘3-o'clock’ position of a neck side to a ‘3-o'clock’ direction of a screen side on the basis of the lengthy direction of the deflection coil; a first flange coil extendedly formed for a predetermined length from a ‘3-o'clock’ position of the screen side to a ‘12-o'clock’ direction of the screen side; a second deflection portion coil extendedly formed for a predetermined length from a ‘12-o'clock’ position of the screen side to a ‘12-o'clock’ direction of the neck side
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: May 13, 2003
    Assignee: LG Electronics Inc.
    Inventor: Jong Ho Lim
  • Patent number: 6509687
    Abstract: The present invention relates generally to a new electrode forming metal/magnetic-ceramic laminate with through-holes and process thereof. More particularly, the invention encompasses a new process for fabrication of a large area ceramic laminate magnet with a significant number of holes, integrated metal plate(s) and co-sintered electrodes for electron and electron beam control. The present invention also relates to a magnetic matrix display (MMD), and electron beam source, and methods of manufacture thereof.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: January 21, 2003
    Assignee: International Business Machines Corporation
    Inventors: Govindarajan Natarajan, Raschid J. Bezama, John U. Knickerbocker, Robert W. Pasco
  • Patent number: 6495950
    Abstract: A deflection yoke capable of easily adjusting a member having a pair of magnetic pieces by moving the member to a standard state in the case of correcting misconvergence. According to the deflection yoke of the invention, a member having a pair of magnetic pieces disposed in the horizontal deflection direction is attached to an electron gun side of the deflection yoke. The shape of a part of each of ends of the member coincides with a part of the outer shape of the electron gun side of the deflection yoke. The adjusting person can easily set the member into the standard state by adjusting the parts with his/her fingers. By moving the member in the horizontal direction from such a state, misconvergence can be corrected.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: December 17, 2002
    Assignee: Sony Corporation
    Inventors: Katsumi Ito, Akihiko Mori, Kazuhiko Endo
  • Patent number: 6492783
    Abstract: Horizontal line misconvergences produced at screen upper and lower portions, among rasters displayed by side electron beams are corrected without producing degradation in vertical deflection sensitivity so much and changing horizontal trapezoidal distortion. In a deflection yoke provided with a top-and-bottom pair of saddle-type horizontal deflection coils and a right-and-left pair of saddle-type deflection coils and mounted to and used in a color cathode ray tube having an in-line arranged electron gun, a pair of sub-cores is provided from side to side or above and below on the electron gun side of the deflection yoke. At least one pair of correction coils is wound around each of the pair of sub-cores.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: December 10, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Souichi Sakurai, Nobuyuki Koganezawa, Nobutaka Okuyama, Takeshi Kaneki
  • Patent number: 6455996
    Abstract: In a convergence correction device according to the present invention and a cathode-ray tube using such convergence correction device, a core having wound thereat a vertical correction coil (M/Dv) to which a vertical deflection current is applied is used while such core is being saturated. Also, such core might be made of a material having a characteristic in which a changed amount of a reactance per deflection velocity becomes less than a predetermined value. The above-mentioned predetermined value is less than 2000 &mgr;H/msec, for example. Thus, a convergence pattern, which is difficult to correct at the intermediate portions of upper and lower separated screens of a cathode-ray tube according to the related art, may be satisfactorily corrected without producing bright and dark stripes on the screen of the cathode-ray tube.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: September 24, 2002
    Assignee: Sony Corporation
    Inventor: Toshiya Takagishi
  • Patent number: 6396206
    Abstract: An electron gun which emits three electron beams consisting of a center beam and paired side beams arranged in line in the horizontal axis is arranged in the neck of the vacuum envelope. A neck-side orbital correction coil unit for over-converging the side beams running toward the peripheral portion of a phosphor screen and a panel-side orbital correction coil unit for under-converging the side beams running toward the peripheral portion of the phosphor screen are provided between the cathode of the electron gun and the phosphor screen. The panel-side orbital correction coil unit has four orbital correction coils provided inside the magnetic core of a deflection yoke. Each orbital correction coil includes paired coil wires extending in the tube axis direction. One of the coil wires is positioned at an angle of 10 to 30° to the vertical axis, and the current flows from the neck side toward the panel through this coil wire.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: May 28, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuuichi Sano, Masahiro Yokota, Hiroaki Ibuki
  • Patent number: 6380667
    Abstract: A color cathode-ray tube having at least one trajectory correction device including a plurality of trajectory correction coils, and a current supply circuit for supplying current to these coils. The trajectory correction device functions to over-converge or under-converge a pair of side beams at a peripheral portion of the phosphor screen relative to a center of the phosphor screen. The trajectory correction device produces a magnetic field such that there is a position in the produced magnetic field where no force is exerted on the three electron beams. This position is separated from a plane including a tube axis, and a first direction or a second direction. In this color cathode-ray tube apparatus with this structure, no degradation occurs in focusing or distortion characteristics even where the trajectory correction device is provided, for example, in realizing a flat screen by using a press-formed shadow mask.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: April 30, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Yokota, Yuuichi Sano, Hiroaki Ibuki
  • Patent number: 6380699
    Abstract: A first magnet that generates a magnetic field having the same polarity as that generated by a vertical deflection coil during a deflection toward the upper side is provided on a phosphor screen side of the deflection coil and above a horizontal axis. A second magnet that generates a magnetic field having the same polarity as that generated by the vertical deflection coil during a deflection toward the lower side is provided on a phosphor screen side of the deflection coil and below the horizontal axis. A third magnet that generates a magnetic field having the opposite polarity to that generated by the vertical deflection coil during the deflection toward the upper side is provided on the phosphor screen side with respect to the first and second magnets and above the horizontal axis.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: April 30, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shunichi Miyazaki, Etsuji Tagami
  • Patent number: 6376983
    Abstract: An electron source comprises at least one cathode means, and at least one extractor grid which is used to extract electrons from the cathode means. The extractor grid is a substantially planar sheet having at least one aperture and also has at least one spacing member for spacing the extractor grid at a constant, predetermined spacing from the cathode. Each of the spacing members are formed by removing material around a substantial portion of the periphery of the aperture and folding the remaining portion of the periphery of the aperture at substantially a right angle to the planar sheet.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: April 23, 2002
    Assignee: International Business Machines Corporation
    Inventors: John Stuart Beeteson, John Ulrich Knickerbocker, Andrew Ramsay Knox, Anthony Cyril Lowe
  • Publication number: 20020024288
    Abstract: A color display device comprising a cathode ray tube and a deflection unit. The display device includes magnets for correcting distortions in the raster displayed on the screen and means for providing correction currents through the coils of the correction magnets.
    Type: Application
    Filed: August 29, 2001
    Publication date: February 28, 2002
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventor: Michiel Harjon Wassink
  • Publication number: 20020005691
    Abstract: A color display device comprising a cathode ray tube and a deflection unit is described. The display device includes compensation coils for correcting a raster distortion in the raster displayed on the screen and means for providing correction currents through the correction coils. The ratio between the correction current I24 and the vertical deflection current I21 is higher at half vertical deflection than at full vertical deflection.
    Type: Application
    Filed: July 11, 2001
    Publication date: January 17, 2002
    Applicant: Koninklijke Philips Electronics N.V.
    Inventor: Michiel Harjon Wassink
  • Patent number: 6337534
    Abstract: A color cathode ray tube includes a phosphor screen, a three-beam in-line electron gun, a beam deflection device, and a convergence correction device disposed on a phosphor screen side of the electron gun. The convergence correction device includes a first pair of magnetic pieces positioned on a tube-neck wall side of side electron beams and a second pair of magnetic pieces positioned on opposite sides of a center electron beam, in the in-line direction. The first pair of magnetic pieces each have a first pair of protruding portions extending toward an adjacent one of the second pair of magnetic pieces, and the first pair of protruding portions are arranged on opposite sides of a corresponding one of the side electron beams in a direction perpendicular to the in-line direction.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: January 8, 2002
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Masayoshi Misono, Hiroyuki Tamura, Tsutomu Tojyo
  • Patent number: 6335589
    Abstract: A color cathode ray tube comprises a vacuum vessel including a panel portion having a phosphor screen on its inner face, a neck portion and a funnel portion joining the neck portion and the panel portion. An inline electron gun is disposed inside of the neck portion and includes a main lens and cathode producing a center electron beam and two side electron beams. A deflection yoke for deflecting the electron beams and a pair of 2-pole ring magnets for adjusting electron beam trajectory are disposed around the neck portion. The 2-pole ring magnets have a magnetic flux density distribution at a circle which is concentric with the ring magnets, wherein the radius of the circle corresponds to the distance between adjacent electron beams at the main lens. The ratio of the amplitude of the flux density in the radial component compared to the amplitude of the flux density in the circumferential component is 0.86 to 1.38 on the circle.
    Type: Grant
    Filed: January 9, 2001
    Date of Patent: January 1, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Kentaro Oku, Hidehiro Koumura, Tomoki Nakamura, Hisashi Nose, Kunio Ishiyama
  • Patent number: 6317106
    Abstract: A magnetic matrix display device has a grid electrode in which differing first grid (G1) and second grid (G2) apertures are used. A sensor element and a second grid electrode are combined as a single structure. Other aspects of the invention relate to a deflection anode having reduced capacitance, the use of a polyimide coating for the grid electrodes, the use of a compliant mounting and adjustment for a grid assembly and the provision of an illuminated border on a magnetic matrix display.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: November 13, 2001
    Assignee: International Business Machines Corporation
    Inventors: John Stuart Beeteson, Andrew Ramsay Knox, Christopher Carlo Pietrzak
  • Patent number: 6246165
    Abstract: An electron source comprises a permanent magnet having channels within the plate extending between opposite poles of the magnet. The internal surfaces of the channels are conductive. A cathode means is located at a first pole of the magnet, at one end of the channels. Each channel within the magnet has a plurality of perforations located on a surface of the permanent magnet, the surface extending between opposite poles of the magnet. A potential applied between the cathode and the conductive internal surfaces of the channels causes electrons to be received into the channels and each perforation forms electrons received from the cathode means into an electron beam for guidance towards a target.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: June 12, 2001
    Assignee: International Business Machines Corporation
    Inventor: John Stuart Beeteson
  • Patent number: 6239542
    Abstract: A cathode ray tube comprises an electron gun for generating electron beams. External magnetic fields influence the electron beams and reduce the picture quality. An electrode of the gun includes a part of a soft-magnetic material, which extends transversely to the electron beams, and two parts, situated to the left and to the right of the electron beams, which extend along the electron beams. Together these parts form a magnetic circuit. Preferably, these parts are strongly magnetically coupled, for example, because they are interconnected or very closely spaced. Interaction of the magnetic circuit formed by the three parts with an external magnetic field causes a Lorentz force on the electron beams. The resultant deviations in the paths of the electron beams largely compensate for the deviations in the paths of the electron beams caused by the effect of the external magnetic field between the electron gun and the display screen.
    Type: Grant
    Filed: May 7, 1999
    Date of Patent: May 29, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Martijn J. Dekker, Leendert J. Noordermeer
  • Publication number: 20010001530
    Abstract: A color cathode ray tube comprises a vacuum vessel including a panel portion having a phosphor screen on its inner face, a neck portion and a funnel portion joining the neck portion and the panel portion. An inline electron gun is disposed inside of the neck portion and includes a main lens and cathode producing a center electron beam and two side electron beams. A deflection yoke for deflecting the electron beams and a pair of 2-pole ring magnets for adjusting electron beam trajectory are disposed around the neck portion. The 2-pole ring magnets have a magnetic flux density distribution at a circle which is concentric with the ring magnets, wherein the radius of the circle corresponds to the distance between adjacent electron beams at the main lens. The ratio of the amplitude of the flux density in the radial component compared to the amplitude of the flux density in the circumferential component is 0.86 to 1.38 on the circle.
    Type: Application
    Filed: January 9, 2001
    Publication date: May 24, 2001
    Inventors: Kentaro Oku, Hidehiro Koumura, Tomoki Nakamura, Hisashi Nose, Kunio Ishiyama
  • Patent number: 6194824
    Abstract: Four magnetic pieces are provided inside the cup-shaped portion of a shield cup. Correction magnetic field generating faces at the tips of the magnetic pieces are opposed to each other and sandwich an electron beam. Correction can be conducted according to the astigmatism amount of three electron beams because a correction magnetic field corresponding to the strength of a deflection magnetic field can be generated easily by leading the deflection magnetic field absorbed by the principal face portion of each magnetic piece to the correction magnetic field generating face. Thus, the difference in astigmatism amount among the electron beams caused by the deflection magnetic field can be corrected. Therefore, a color cathode ray tube apparatus that can display images with a high resolution over the whole screen surface can be provided.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: February 27, 2001
    Assignee: Matsushita Electronics Corporation
    Inventor: Yasuyuki Ueda
  • Patent number: 6194823
    Abstract: A color cathode ray tube has a vacuum vessel including a panel portion having a phosphor screen on its inner face, a neck portion and a funnel portion jointing the neck portion and the panel portion; an electron gun assembly including an electrostatic main lens disposed in the neck portion; a deflection yoke arranged around the neck side of the funnel portion for deflecting three in-line arranged electron beams emitted from the electron gun assembly to the phosphor screen; and a 2-pole ring magnet arranged around the neck portion for adjusting the trajectories of the electron beams. The 2-pole ring magnet is arranged to have its center closer to the phosphor screen than is the center of the electrostatic main lens of the electron gun assembly. The value, as calculated by dividing the value of the radial component amplitude of the magnetic field distribution of the 2-pole ring magnet on the circumference of a circle having a radius of the s-size, by the value of the circumferential component amplitude, is 0.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: February 27, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Kentaro Oku, Hidehiro Koumura, Tomoki Nakamura, Hisashi Nose, Kunio Ishiyama
  • Patent number: 6181059
    Abstract: An electron source comprises a first permanent magnet having a first channel, extending between first and second poles of the magnet, the internal surfaces of the first channel being conductive. A cathode means is located in the first channel at a first pole of the magnet, a potential being applied between the cathode means and the conductive internal surfaces of the first channel causing electrons to be received into the first channel. A plurality of apertures is located on a wall of the first channel, the wall abutting a second permanent magnet having a plurality of second channels extending between first and second poles of the second magnet. The second pole of the second permanent magnet is adjacent to the aperture located on a wall of the first magnet such that electrons received into the first channel are distributed into the plurality of second channels.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: January 30, 2001
    Assignee: International Business Machines Corporation
    Inventor: John Stuart Beeteson
  • Patent number: 6177759
    Abstract: A display device comprises a substrate, cathode means for emitting electrons, a permanent magnet and one or more supports between the substrate and the magnet. A two dimensional array of channels extends between opposite poles of the magnet, the magnet generating, in each channel, a magnetic field for forming electrons from the cathode means into an electron beam. A screen receives an electron beam from each channel, the screen having a phosphor coating facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of pixels each corresponding to a different channel. Grid electrode means is disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel, the grid electrode means having a plurality of apertures, each aperture corresponding to one of the channels.
    Type: Grant
    Filed: May 11, 1998
    Date of Patent: January 23, 2001
    Assignee: International Business Machines Corporation
    Inventors: John Beeteson, Andrew Ramsay Knox
  • Patent number: 6166484
    Abstract: A deflection yoke for a CRT including a horizontal deflection coil having an axial length in an axial direction of the CRT in an installed position that is not less than 60 mm and not more than 80 mm, a vertical deflection coil having an axial length in an axial direction that ranges from 45 mm to 65 mm, and a core having an axial length in the axial direction that ranges from 25 mm to 45 mm. The subject deflection yoke prevents deterioration in horizontal and vertical deflection sensitivity in CRTs having a neck diameter that is greater than 22 mm and less than 26 mm with a deflection angle that ranges from 95 to 110 degrees. In an alternate embodiment a deflection yoke for a CRT including a horizontal deflection coil, a vertical deflection coil disposed outside of the horizontal deflection coil, and a core disposed outside of the vertical deflection coil wherein in an installed position of the yoke, an inner surface of the deflection yoke is circumscribed around a circle having a diameter of 56.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: December 26, 2000
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.
    Inventors: Nobutaka Okuyama, Kouji Fukuyama, Soichi Sakurai, Hiroshi Yoshioka, Masao Obara, Misao Ikeda, Takeshi Chiba
  • Patent number: 6160343
    Abstract: This invention relates to an apparatus for compensating convergence in a color cathode ray tube, more particularly to an apparatus for minimizing the convergence drift variance of R and B electron beams on a screen so as to improve convergence characteristics and a picture quality on the screen. The apparatus for compensating convergence drift comprising: a convergence purity magnet for converging the electron beams emitted from the electron gun on the specific point of the screen of the color cathode ray tube; and a supplementary magnet ring 52 with at least four-magnetic pole contacting the neck N between a second grid electrode 24 and the deflection yoke 60. Particularly, the supplementary magnet ring is mounted on a holder 48 of the convergence purity magnet 40 and has a pole arrangement to move the convergence of the R and B beams in the direction opposite to the electron gun from the screen.
    Type: Grant
    Filed: September 14, 1998
    Date of Patent: December 12, 2000
    Assignee: SamSung Display Devices Co., Ltd.
    Inventor: JangJin Joung
  • Patent number: 6157122
    Abstract: A color cathode ray tube having electron gun with a plurality of electrodes for generating and focusing three in-line electron beams toward a phosphor screen. A deflection device is mounted between a funnel portion and a neck portion for deflecting the three electron beams in horizontal and vertical directions, and a convergence correction device including a plurality of magnetic pieces positioned with respect to the three electron beams in an in-line direction of the three electron beams in magnetic deflection fields generated by the deflection device.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: December 5, 2000
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Masayoshi Misono, Hiroyuki Tamura, Tsutomu Tojyo
  • Patent number: 6127775
    Abstract: An electronic display device includes a two-dimensional array of point charge sources, which are aligned with a plurality of apertures defined in a substrate. Associated with each aperture is a set of electrodes, including a focusing electrode, which in effect funnels the ions from the charge source into a narrow stream, and a plurality of displacing electrodes, through which the ion stream can be caused to scan over a small two-dimensional area on a phosphor. Modulating the bias on the focusing electrode can be used to control the ion stream passing through an individual aperture according to image data. The combined action of a two-dimensional array of charge sources and associated control devices can create a single composite image on the phosphor.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: October 3, 2000
    Assignee: Xerox Corporation
    Inventor: Richard F. Bergen
  • Patent number: 6124669
    Abstract: A pair of first magnetic bodies extending in a direction of an X-axis are so disposed as to be opposed to each other on the X-axis in order to shield an external magnetic field acting on three electron beams lined side by side in the direction of X-axis. A pair of arcuated second magnetic bodies are disposed symmetric with respect to the X-axis in the vicinity of a Y-axis at a predetermined distance from a ring-shaped six-pole magnet plate. The first magnetic bodies, second magnetic bodies and six-pole magnet plate are arranged in this positional relationship, whereby a predetermined magnetic field distribution is created. Cathodes of an electron gun structure are arranged in such a position that a sum of a positive magnetic field component is substantially equal to a sum of.the negative magnetic field component on the trajectory of a center beam.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: September 26, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hisakazu Okamoto
  • Patent number: 6069438
    Abstract: A color CRT including an envelope having a tube axis (Z) and including panel (21) having an inner surface on which a phosphor screen (23) is formed, a funnel (22) connected to the panel (21) and neck (25) connected to the funnel (22), an electron gun assembly (40) arranged in the neck (25) for emitting three in-line electron beams toward the phosphor screen (23), convergence magnetic structure (32) arranged outside of the neck (25) for generating a hexapole magnetic field in the neck (25), a first pair of magnetic members (33A, 33B) arranged outside of the neck on a horizontal axis faced to each other with the electron gun interposed therebetween and extending along the axis of the tube; and a second pair of magnetic members (60A, 60B) so arranged in the X-Y plane as to face each other on a Y-axis and elongated along the magnetic structure (32), respectively, the X-axis corresponding to the horizontal axis, the Y-axis corresponding to the vertical axis normal to the tube axis (Z).
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: May 30, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hisakazu Okamoto
  • Patent number: 6060824
    Abstract: A pair of magnetic bodies extending in an axial direction of a color cathode ray tube are arranged apart from each other in a direction perpendicular to the axial direction so as to shield an external magnetic field acting on three electron beams forming a row in the direction perpendicular to the axial direction. A ring-like 6-pole magnet plate disposed in a plane perpendicular to the axial direction is arranged in substantially a central region in a longitudinal direction of the magnetic bodies. These 6-pole magnet plate and magnetic bodies arranged in the particular positional relationship generate a magnetic field distributed to have a plurality of peaks of intensity on the orbit of the central beam. The magnetic field runs on the orbit of the central beam toward one magnetic body around one of the peaks, and runs toward the other magnetic body around the adjacent peak.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 9, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hisakazu Okamoto, Takeki Miyazono
  • Patent number: 6051921
    Abstract: A magnet for use in a magnetic matrix display has a two dimensional array of apertures between opposite poles of the magnet. The direction of the magnetic field is such that the magnet generates, in each channel, a collimating magnet field for forming electrons from a cathode into an electron beam. A `keeper`, area around the periphery of the magnet is used to improve the linearity of the field strength in the apertures from apertures at the center of the magnet to apertures at the periphery of the magnet. The `keeper`, area may have control circuits placed on the surface of that area of the magnet. The keeper area may contain apertures which are not used for collimation and into which electrons are prevented from entering by a grid electrode or by a physical blocking means.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: April 18, 2000
    Assignee: International Business Machines Corporation
    Inventors: John Beeteson, Andrew Ramsey Knox
  • Patent number: 6040808
    Abstract: An electron source having a cathode and a permanent magnet having perforated channels extending between opposite poles of the magnet. Each channel forms electrons received from the cathode into an electron beam for guidance towards a target. The electron source has applications in a wide range of technologies, including display technology and printer technology.
    Type: Grant
    Filed: October 22, 1997
    Date of Patent: March 21, 2000
    Assignee: International Business Machines Corporation
    Inventors: Andrew Knox, John Beeteson
  • Patent number: 6031327
    Abstract: A deflection yoke for use in a cathode ray tube is disclosed for overcoming a deflection yoke noise problem due to the vibration of a correction projection and simultaneously controlling in an easy manner a local magnetic field adjustment. The deflection yoke includes a net-shaped correction projection for convergence correction formed of a plurality of wires.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: February 29, 2000
    Assignee: LG Electronics Inc.
    Inventor: Seok-Moon Lee
  • Patent number: 6008573
    Abstract: Area cathode device for generating free electrons in a first evacuated chamber comprises a back plate; a silica glass substrate peripherally sealed to the back plate to produce a second chamber; a gas contained in the second chamber; a layer of photo-sensitive material disposed on the surface of the substrate external to the first chamber; a cathode phosphor layer disposed between the back plate and the substrate; and a pair of electrodes facing each other from opposite sides of the second chamber for energizing the gas to generate a plasma for exciting the cathode phosphor layer to generate light energy for producing electron emissions from the photo-sensitive material.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: December 28, 1999
    Assignee: International Business Machines Corporation
    Inventors: John Beeteson, Andrew Ramsay Knox
  • Patent number: 5986395
    Abstract: A metal/ferrite laminate magnet has perforations forming apertures in the magnet. The magnet is formed of outside metal plates surrounding a sandwich of two layers of ferrite material. The outside metal plates allow the perforations to be made in the magnet before sintering of the magnet and maintain the alignment of the holes during sintering. The metal plates also provide the magnet with mechanical robustness and rigidity and prevent cracking occurring between adjacent apertures.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: November 16, 1999
    Assignee: International Business Machines Corporation
    Inventors: John Ulrich Knickerbocker, Andrew Ramsay Knox, Robert Rosenberg
  • Patent number: 5917277
    Abstract: An electron source having a cathode and a permanent magnet having perforated channels extending between opposite poles of the magnet. Each channel forms electrons received from the cathode into an electron beam for guidance towards a target. The electron source has applications in a wide range of technologies, including display technology and printer technology.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: June 29, 1999
    Assignee: International Business Machines Corporation
    Inventors: Andrew Knox, John Beeteson
  • Patent number: 5912530
    Abstract: A color cathode ray tube includes a vacuum envelope formed by a panel, neck and funnel portions. The cathode ray tube includes a phosphor screen, a shadow mask, an electron gun and a deflection device. The cathode ray tube further includes a convergence correction device having a plurality of magnetic pieces positioned on opposite sides of each of the three electron beams in an in-line direction of the electron beams in a magnetic deflection fields generated by the deflection device. The plurality of magnetic pieces include a first pair of magnetic pieces positioned on a neck wall side of each of side electron beams in the in-line direction and a second pair of magnetic pieces positioned on opposite sides of a center electron beam of the three electron beams in the in-line direction. The plurality of magnetic pieces are configured so as to locally modify the magnetic deflection fields to make three rasters formed on the phosphor screen by the three electron beams coincident with each other.
    Type: Grant
    Filed: August 19, 1997
    Date of Patent: June 15, 1999
    Assignees: Hitachi, Ltd., Hitachi Device EngineeringCo., Ltd.
    Inventors: Masayoshi Misono, Hiroyuki Tamura, Tsutomu Tojyo