With Additional Electrode Patents (Class 313/449)
  • Patent number: 10297416
    Abstract: The purpose of the present invention is to be able to acquire high-resolution images in a scanning electron microscope using a combination of a cold cathode (CFE) electron source and a boosting process, even at low accelerating voltage enhancing the current stability of the CFE electron source. A configuration in which a CFE electron source (101), an anode electrode (103) at positive (+) potential, and an insulator (104) for isolating the anode electrode (103) from ground potential are accommodated within a single vacuum chamber (105), and an ion pump (106) and a non-evaporable getter (NEG) pump (107) are connected to the vacuum chamber (105), is employed.
    Type: Grant
    Filed: October 20, 2014
    Date of Patent: May 21, 2019
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Toshihide Agemura, Masashi Sasaki, Daisuke Kobayashi, Shunsuke Sato
  • Patent number: 10074507
    Abstract: In one embodiment, an electron beam drawing apparatus includes an electron gun including a cathode and an anode, a current control circuit controlling a total emission current, a first detector detecting a first emission current from an outer peripheral portion of the cathode, a second detector detecting a second emission current from an central portion of the cathode, and a controller that determines a coefficient, which is a ratio of an emission current from the outer peripheral portion of the cathode to the first emission current. During a period in which a pattern is drawn on the substrate, the controller estimates a value of the second emission current by subtracting a value, which is resulted by multiplying the first emission current by the coefficient, from the total emission current, and controls the current control circuit in a manner of holding the estimated value constant.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: September 11, 2018
    Assignee: NuFlare Technology, Inc.
    Inventor: Hideyuki Iwata
  • Patent number: 7986080
    Abstract: An electron-emitting device and a fabricating method thereof are provided. First, a substrate, having a first side and a second side which is opposite to the first side, is provided. Afterwards, a first electrode pattern layer is formed on the first side of the substrate. Next, a conductive pattern layer is formed on the substrate and the first electrode pattern layer. After that, an electron-emitting region is formed in the conductive pattern layer. Then, a second electrode pattern layer is formed on the second side of the substrate and partially covers the conductive pattern layer. The fabricating method has a simple fabricating process and a low fabricating cost.
    Type: Grant
    Filed: December 25, 2007
    Date of Patent: July 26, 2011
    Assignee: Chunghwa Picture Tubes, Ltd.
    Inventors: Chih-Hao Tsai, Kuan-Jung Chen, Fu-Ming Pan, Mei Liu, Chi-Neng Mo
  • Patent number: 7323813
    Abstract: Assuming an aperture diameter of an electron beam aperture formed in a shield cup as Vsc, an aperture diameter of an electron beam aperture formed in an inner electrode of a focusing electrode as V5, and a distance between the electron beam aperture formed in the shield cup and the inner electrode as L, the above-mentioned aperture diameter Vsc, the aperture diameter V5 and the distance L are determined to satisfy tan ?=(V5?Vsc)/2L?0.08. Due to such a constitution, it is possible to enhance the degree of vacuum in the inside of a cathode ray tube and, it is possible to prevent a getter for elevating the degree of vacuum in the inside of the cathode ray tube and for maintaining the elevated degree of the vacuum from being scattered to the electron gun side thus preventing the deterioration of the characteristics of the electron gun.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: January 29, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Watanabe, Kazunari Noguchi, Hiroshi Takanobu
  • Patent number: 7148614
    Abstract: An electron gun for a cathode ray tube comprises a triode including a cathode, a control electrode and an accelerating electrode, a pre-focusing electrode unit adjacent to the triode, a main lens unit including a focusing electrode and an anode for forming a main lens for focusing the electron beam toward a screen, a first focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, a second focusing electrode unit having vertically-elongated electron beam passing holes and horizontally-elongated electron beam passing holes for forming a quadrupole lens, and an auxiliary electrode disposed between the first focusing electrode unit and the second focusing electrode unit, to which a dynamic voltage is applied, and including vertically-elongated electron beam passing holes on electron beam incoming side thereof and horizontally-elongated electron beam passing holes on electron beam outgoing side thereof.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: December 12, 2006
    Assignee: LG. Philips Displays Korea Co., Ltd.
    Inventor: Dong-Young Kim
  • Patent number: 7135813
    Abstract: A main lens is formed by a focus electrode, an intermediate electrode, and an anode electrode successively arranged in a traveling direction of an electron beam. The focus electrode and the anode electrode respectively have an electron beam passage aperture common to three electron beams, having a major axis in a horizontal direction in a portion opposed to the intermediate electrode, and three electron beam passage apertures through which the three electron beams pass are formed respectively in the focus electrode and the anode electrode. Aperture dimensions in a vertical direction of the electron beam passage apertures common to the three electron beams formed respectively in the focus electrode and the anode electrode are smaller than those in the vertical direction of the electron beam passage apertures formed in portions of the intermediate electrode respectively opposed to the focus electrode and the anode electrode.
    Type: Grant
    Filed: April 7, 2005
    Date of Patent: November 14, 2006
    Assignee: Matsushita Toshiba Picture Display Co., Ltd.
    Inventors: Tsutomu Takekawa, Hirofumi Ueno
  • Patent number: 7122977
    Abstract: A prefocus lens section is formed by a screen electrode and an additional electrode. A main lens section is formed by a focus electrode, an anode electrode and an intermediate electrode that is disposed between the focus electrode and the anode electrode. Each of the focus electrode and the intermediate electrode has a cylindrical electrode on at least one of opposed faces thereof. The intermediate electrode and the anode electrode have cylindrical electrodes on opposed faces thereof. A voltage with a level higher than a focus voltage and lower than an anode voltage is applied to the additional electrode and the intermediate electrode.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: October 17, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Ueno, Tsutomu Takekawa
  • Patent number: 7045976
    Abstract: Electron gun for cathode ray tube comprising aligned in series along an axis XX? an electron-emitting cathode K, electrodes G1 and G2 for the formation of an electron beam, a prefocusing electron lens G3, G4, G5, a first quadripolar device G7, G8 electrically controlled in a dynamic manner in synchronism with the screen scan so as to correct beam focusing defects at the screen edge, a main electron lens G8–G9 making it possible to focus the electron beam onto a screen. It also comprises a second quadripolar device G5, G6, G7situated between the prefocusing electron lens G3, G4 and the first quadripolar device and comprising electrodes G5, G6, G7exhibiting rectangular apertures. Those of G5 and G7 are parallel and those of G6 are orthogonal to those of G5 and G7. The electrodes G5 and G7 are placed at a fixed polarization potential, and the electrode G6 is at a polarization potential varying in synchronism with the screen scan.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: May 16, 2006
    Assignee: Thomson Licensing
    Inventors: Grégoire Gissot, Nicolas Richard, Nicolas Gueugnon, Pierre Bizot
  • Patent number: 6987367
    Abstract: A prefocus lens section in an electron gun assembly includes a second grid that is disposed on an electron beam generating section side, a third grid that is disposed on a main lens section side, and a shield grid that is disposed between the second grid and the third grid. The shield grid is a cup-shaped electrode with a side wall that surrounds an outer peripheral part of the third grid, which part is located on the second grid side, and extends in parallel to a tube axis. The shield grid has a bottom surface disposed to face the second grid and has an open end disposed to face the third grid. A relationship, Ec<Vf<Er, is established, where Ec is a potential applied to the second grid, Vf is a potential applied to the shield grid, and Er is a potential applied to the third grid.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: January 17, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Osamu Ono, Shigeru Sugawara, Toshio Shimaoogi, Tomoyuki Hayama
  • Patent number: 6971766
    Abstract: An aperture lamp system that facilitates improved reliability and performance in a display system is provided. The aperture lamp system provides improved reliability by providing a second lamp coupled to a first lamp through a coupling aperture. When the first lamp fails, the second lamp can be used to provide illumination to the display. Specifically, light from the second lamp passes through the coupling aperture to the first lamp, where it can exit the first lamp and illuminate the display. Thus, by coupling the first and second lamps together through a coupling aperture, a lamp system is provided where either the first lamp or second lamp can be used to provide illumination for the display. Thus, the first and second lamps provide redundancy, with this redundancy used to improve the reliability of the display system.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: December 6, 2005
    Assignee: Honeywell International Inc.
    Inventors: Brian D. Cull, Elias S. Haim, Allan E. Harris, John F. Schmidt
  • Patent number: 6952077
    Abstract: An electron gun for a cathode ray tube includes a cathode for radiating electron beams, a scanning velocity modulation coil for synchronizing the electron beams with an image signal, a focus electrode having first and second sub-electrodes disposed with a gap through which a magnetic field generated by the scanning velocity modulation coil passes, a plurality of grid electrodes with the focus electrode for controlling the electron beams radiated from the cathode, a support for aligning and supporting the grid electrodes, and a shield electrode electrically connected to the first and second sub-electrodes to protect against infiltration of an outer electric field. The shield electrode includes plural intermediate electrodes disposed in the gap between the first and second sub-electrodes, and electrical connecting unit for electrically connecting the intermediate electrodes to the first and second sub-electrodes. The intermediate electrodes are spaced away from each other.
    Type: Grant
    Filed: May 14, 2002
    Date of Patent: October 4, 2005
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Duk-Sung Park, Yeong-Guon Won, Bong-Wook Jung, Se-Ja-Chul Hwang
  • Patent number: 6917151
    Abstract: A resistor for an electron gun assembly is configured to apply a voltage, which is divided with a predetermined resistance division ratio, to an electrode provided in the electron gun assembly. The resistor includes an insulating substrate, an electrode element provided in association with each of a plurality of terminal portions on the insulating substrate, a resistor element having a pattern for connecting the electrode elements and obtaining a predetermined resistance value, and an insulating coating layer that covers the resistor element. In at least one terminal portion B, the electrode element is disposed spaced apart from the insulating coating layer, and an intermediate resistor element is disposed between the electrode element and the insulating coating layer. The intermediate resistor element has a resistance value that is different from a resistance value of the electrode element.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: July 12, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Kimiya, Shigeru Sugawara, Takahiro Hasegawa
  • Patent number: 6903501
    Abstract: An electron gun for a monochrome cathode ray tube to be used in a projection display device includes a cathode for emitting thermal electrons, and first and second electrodes forming a triode portion together with the cathode. A third electrode is adjacent the second electrode. A fourth electrode is adjacent the third electrode to receive a focus voltage. A fifth electrode partially surrounds the fourth electrode while being adjacent the fourth electrode to receive an anode voltage together with the third electrode. The second electrode has a bottom portion with a stepped portion surrounding a hole for guiding the electron beams while being protruded toward the first electrode, and a sidewall portion extended from the periphery of the bottom portion toward the third electrode. The first and the second electrodes are structured to satisfy the following condition: 0.54?T/G?1.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: June 7, 2005
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Yoo-Seon Kim
  • Patent number: 6841924
    Abstract: A low voltage Einzel gun design maximizes the size of the second main lens to reduce spherical aberrations thereby reducing spot-size and improving focus quality. The gun's final accelerator electrode is formed as an internal conductive coating on the neck, which is connected to anode potential through an anode button. The jumper between the final and second accelerator electrodes is removed and the second accelerator electrode is connected through the high voltage stem pin to an external potential. Connection of the high voltage stem pin to anode potential defines an Einzel gun. The focus electrode is now connected to one of the low voltage stem pins. In a high voltage Einzel gun, connecting the second accelerator electrode and focus electrode to the high voltage and a low voltage stem pin, respectively, would cause arcing between the pins.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: January 11, 2005
    Assignee: Intel Corporation
    Inventor: Thomas A. Skupien
  • Patent number: 6815913
    Abstract: The present invention provides a cathode ray tube which exhibits a favorable contrast by enhancing a speed modulation effect. A front-stage anode electrode and a focus electrode which constitute an electron gun are respectively divided into a plurality of portions. A plurality of portions of the divided front-stage anode electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. A plurality of portions of the divided focus electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. Due to gaps formed in the front-stage anode electrode and the focus electrode, the speed modulation effect is increased.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: November 9, 2004
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.
    Inventors: Syoichi Wakita, Nobuyuki Suzuki, Toshio Nakayama, Yasuo Tanaka, Kouichi Harasaka
  • Patent number: 6798129
    Abstract: An electron gun for a CRT includes a pair of bead glasses separated from and parallel to each other, supporting electrodes of the electron gun. An electrode has electron beam passing holes and at least one electrode support embedded in each bead glass. The electrode support includes at least two embedding protrusions embedded in the bead glass. One of the protrusions is longer than the other protrusion. The structure of the electrode support is improved so cracks in a bead glass during a beading process do not occur and twisting in a gap between the bead glass and an electrode support is minimized. There is no gap between the bead glass and the electrode, so leakage current does not flow between the electrodes, improving the lifetime of electrical features of the electron gun.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: September 28, 2004
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Byoung-kon Roh
  • Patent number: 6794807
    Abstract: An electron gun for a cathode ray tube includes a single cathode that emits thermions; first and second electrodes; a plurality of focus electrodes provided consecutively after the second electrode; an anode electrode mounted after a final focus electrode; and a support that supports the electrodes in an aligned configuration. The final focus electrode and the anode electrode are mounted opposing one another with a predetermined gap therebetween. If a lengthwise direction of phosphor layers forming a phosphor screen of the cathode ray tube is a Y axis direction, and a direction perpendicular to the Y axis direction is an X axis direction, an electron beam aperture formed in a portion of the final focus electrode opposing the anode electrode, and an electron beam aperture formed in the anode electrode have diameters in the X axis direction that are larger than corresponding diameters of electron beam apertures formed in the remaining electrodes.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: September 21, 2004
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Tae-Sik Oh, Sang-Hwan Cho, Jeong-Nam Kim, Eui-Jeong Hwang, Bok-Chun Yun
  • Patent number: 6741020
    Abstract: A cathode ray tube has an anode and a focus electrode. The large-diameter cylinder portion of the focus electrode is disposed concentrically within a large-diameter cylinder portion of the anode. The anode and a first electrode facing a cathode side end of the focus electrode are electrically connected together within the cathode ray tube. The following relationship is satisfied: −LP+184.9≧LG4≧0.0004 LP3−0.1571 LP2+21.006 LP−922.41, where LG4 (mm) is an axial length of the focus electrode, and LP (mm) is a distance from a phosphor screen side end of the focus electrode to a center of a phosphor screen.
    Type: Grant
    Filed: January 9, 2003
    Date of Patent: May 25, 2004
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.
    Inventors: Shoichi Wakita, Yasuo Tanaka, Toshio Nakayama, Nobuyuki Suzuki, Shoji Shirai
  • Patent number: 6731056
    Abstract: A color cathode ray tube having at least an electron gun, constituted by a cathode for forming a plurality of electron beams arranged in-line, and a focusing electrode and an anode constituting a main lens for focusing and accelerating the electron beams and a fluorescent screen. The focusing electrode includes at least a first division electrode and a second division electrode arranged with a gap for controlling a scanning speed of the electron beams in common. The second division electrode is opposed to the anode and has, in an opposed surface thereof, a single opening for passing the plurality of electron beams in common. A length of the first division electrode in the axial direction of the tube is longer than a length of the second division electrode in the axial direction of the tube.
    Type: Grant
    Filed: February 13, 2002
    Date of Patent: May 4, 2004
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Tsutomu Tojo, Hiroyuki Tamura, Masayoshi Misono
  • Patent number: 6720726
    Abstract: In an electron gun assembly, its main convergence lens is composed of a focus electrode to which a focus voltage is applied, an anode electrode to which a high anode voltage is applied, and an intermediate electrode which is provided between the focus and anode electrodes and to which a high intermediate potential higher than the focus voltage and lower than the anode voltage is applied. The anode and intermediate electrodes are each a cylindrical unit long in the in-line direction. In the direction crossing at right angles with the in-line direction of the cylindrical units, the diameter of the opening in the anode electrode is set smaller than that of the opening in the intermediate electrode, thereby forming a multiple pole lens into a main electron lens of large aperture.
    Type: Grant
    Filed: November 24, 2000
    Date of Patent: April 13, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Kimiya, Shunji Ookubo
  • Patent number: 6710532
    Abstract: An electron gun is provided for a CRT. The electrode gun includes three cathodes for emitting electron beams, a plurality of acceleration electrodes, and a focus electrode and an anode. The focus electrode and the anode each include an opposite rim having a single electron beam pass-through hole with a vertical width V and a horizontal width H, and an electrostatic field control body positioned at a distance D from the rim, with a bridge width ‘t’, and a vertical width v and a horizontal width h of a central electron beam pass-through hole, wherein the electrostatic field control body and the focus electrode and the anode are configured to satisfy the following equation: (VxvxD)/29≧H−(2×S), where, S denotes a sum of the horizontal width h and the bridge width t of the electrostatic field control body. Spherical aberration is prevented or reduced, improving a vertical resolution of the picture.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: March 23, 2004
    Assignee: LG Electronics Inc.
    Inventor: Jin Yeol Choi
  • Patent number: 6703775
    Abstract: In an electron gun for a color cathode ray tube apparatus of this invention, one intermediate electrode is arranged between a final acceleration electrode and a focus electrode that make up a main lens, and a voltage divided by a voltage dividing resistor for dividing a voltage to be applied to the final acceleration electrode is applied to the intermediate electrode. A dynamic voltage which increases along with an increase in deflection amount of an electron beam is applied to the focus electrode, and a dielectric portion is formed between the final acceleration electrode and the focus electrode. This dielectric portion is formed on the intermediate electrode. Hence, elliptical distortion of electron beam spots is decreased on the entire surface of a phosphor screen, thereby providing a color cathode ray tube apparatus with a good performance on the entire surface of the phosphor screen.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: March 9, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Noriyuki Miyamoto, Hirofumi Ueno, Tsutomu Takekawa
  • Patent number: 6696780
    Abstract: An electron gun that can provide a desired electron beam modulation effect without preventing a modulation magnetic field from passing from an exterior of the vacuum portion is provided. A part of a tubular G3 electrode in an electron gun is formed into a coiled portion to allow the modulation magnetic field to pass through the clearances between parts of a wire composing the coiled portion.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: February 24, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideharu Ohmae, Masahiko Konda, Toshiharu Hoshi
  • Patent number: 6693398
    Abstract: The present invention relates generally to an electron gun for a color cathode ray tube, and more particularly to an electron gun for achieving an excellent focus characteristic on the whole screen by forming a dynamic quadruple lens in the electron gun used for a transpose scan type cathode ray tube.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: February 17, 2004
    Assignee: LG. Philips Displays Korea Co., Ltd.
    Inventor: Sung Ho Cho
  • Patent number: 6661166
    Abstract: A cathode includes emitter tips provided on a substrate, a gate electrode with an electric field formed between the gate electrode and the emitter tips, and terminals and leads for supplying voltages to the emitter tips and the gate electrode, respectively. A shield electrode further is provided between the cathode and a control electrode, and the shield electrode has a cylindrical projecting portion projecting toward the cathode, through which electron beams pass. The disturbance of an electric field by the leads influences the electron beams; however, this can be prevented by the projecting portion. Because of this, even if the size of the cathode is reduced, the distortion of an electron beam spot on a phosphor screen can be reduced. As a result, a cathode-ray tube with high resolution can be provided at a low cost.
    Type: Grant
    Filed: June 4, 2002
    Date of Patent: December 9, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahide Yamauchi, Takashi Itoh, Koji Fujii, Keisuke Koga, Toru Kawase
  • Patent number: 6624562
    Abstract: Each of an anode and one of the sub-electrodes of a main lens of a shadow mask color cathode ray tube includes a first member having a single opening in their facing ends, and a second member having three beam apertures, wherein (A+566)/106>H−2×S is satisfied, where A is V1×V2×T, V1 is a vertical diameter of the opening, V2 is a vertical diameter of the center beam aperture, T is a distance between the opening and the second electrode member, H is a horizontal diameter of the opening, S is P×L/Q, where P is a horizontal center-to-center spacing between adjacent phosphor elements, Q is a spacing between the phosphor screen and the shadow mask, and L is a distance between the shadow mask and the opening in the first member.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: September 23, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Go Uchida, Shoji Shirai
  • Publication number: 20030173888
    Abstract: The present invention relates to a flat panel display, and more particularly, to a flat panel display in which the main skeletal structure of a horizontal deflecting electrode is arranged in a horizontal direction to enhance structural strength and the structure of an electrode to which voltage is applied is shaped symmetric to eliminate over-converging of electron beam.
    Type: Application
    Filed: March 12, 2003
    Publication date: September 18, 2003
    Inventors: Sung Woo Ko, Nam Jae Koh, In Jue Kim
  • Patent number: 6593686
    Abstract: An electron gun according to this invention includes a cathode having a hemispherical electron-emitting surface, an anode which is arranged to face the cathode, and has a first aperture on the optical axis, and a bias electrode which is arranged between the anode and the cathode, receives a potential lower than one applied to the cathode, and has a second aperture larger than the electron-emitting surface of the cathode on the optical axis. The distal end of the electron-emitting surface of the cathode is arranged in contact with or outside a sphere whose diameter is equal to the diameter of the second aperture of the bias electrode.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: July 15, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshikiyo Yui
  • Patent number: 6586868
    Abstract: An electron gun structure applied to a color cathode-ray tube comprises a focus electrode, an ultimate acceleration electrode and at least one intermediate electrode disposed between the focus electrode and the ultimate acceleration electrode, the focus electrode, the ultimate acceleration electrode and the at least one intermediate electrode forming a main lens. The electron gun structure also comprises a voltage application unit for applying to the focus electrode a dynamic voltage increasing in accordance with an increase in a degree of deflection of the electron beams, and applying to the intermediate electrode a voltage obtained by dividing a voltage applied to the ultimate acceleration electrode by means of a voltage dividing resistor.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: July 1, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsutomu Takekawa, Hirofumi Ueno, Kazunori Satou
  • Patent number: 6583547
    Abstract: A lens structure of a pre-focus part of an Hi-UPF electron gun to be used for a cathode ray tube has a cathode, a control electrode, an acceleration electrode, a first anode, a focus electrode and a second anode arranged in this order. The first anode and the second anode are to be commonly supplied with an anode voltage, and the focus electrode is to be supplied with a focus electrode. In a cathode ray tube of this construction, in the pre-focus part, the control electrode has an electrode beam passage hole of 0.57 mm or smaller and the distance in the vicinity of the electron beam passage hole between the acceleration electrode and the first anode is 1.9 mm or smaller.
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: June 24, 2003
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.
    Inventors: Toshio Nakayama, Yasuo Tanaka, Nobuyuki Suzuki, Shoichi Wakita, Shoji Shirai
  • Patent number: 6570314
    Abstract: A vertical electrode plate having three openings formed in-line through which three electron beams pass respectively is provided only inside a focusing electrode out of the focusing electrode and a final accelerating electrode. A horizontal electrode plate that is substantially parallel to an in-line plane extending toward the focusing electrode is formed at least one of above and below openings at the bottom of a shielding cup, only inside the final accelerating electrode. By setting the height h of the horizontal electrode plate optimally, it is possible to correct a horizontally-elongated distortion of a spot shape in edge portions of a screen, caused by a self-convergence magnetic field of a deflecting device. In this manner, a color display tube that achieves an image display with a high resolution can be provided.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: May 27, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshihiro Daimon, Yasufumi Wada
  • Patent number: 6559586
    Abstract: A cathode ray tube and a plural beam electron gun therefor include a main lens that comprises a tubular focus grid G5 and a conductive coating on the inner surface of the tube neck. The neck coating extends from the region of focus grid G5 towards the faceplate of the cathode ray tube. Preferably, the exit of the focus grid G5 is non-planar and is curved or undulated and focus grid G5 includes an aperture plate intermediate its entrance and exit. The aperture plate preferably has an elliptical center beam opening and connected-semi-elliptical outer-beam openings, to better converge and focus the outer and center electron beams. Also preferably, the focus grid G5 is centrally located in the tube neck and at least partly surrounded by the conductive neck coating.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: May 6, 2003
    Assignees: Sarnoff Corporation, Samsung Display Devices, Co., LTD
    Inventors: Roger Casanova Alig, Dennis John Bechis, David Arthur New
  • Patent number: 6538397
    Abstract: A color cathode-ray tube apparatus comprises an electron gun structure having a plurality of electrodes for constituting a plurality of electron lenses including a main lens for focusing an electron beam on a phosphor screen, and a deflection yoke for producing deflection magnetic fields for deflecting the electron beam emitted from the electron gun structure in a horizontal direction and a vertical direction. An electron beam passage hole formed in at least one of the electrodes constituting the main lens has a waist portion substantially acting on formation of the electron lenses. The waist portion minimizes a horizontal dimension of a region where the electron beam passes.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: March 25, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Ueno, Tsutomu Takekawa, Noriyuki Miyamoto
  • Publication number: 20030042837
    Abstract: The invention relates to a cathode ray tube (100) comprising an electron source (101) having a cathode (105, 106, 107) for emitting electrons, an electron beam guidance cavity (120, 121, 122) having an input and an output aperture for concentrating electrons emitted from the cathode, a first electrode being connectable to a first power supply means for applying, in operation, an electric field having a first field strength E1 between the cathode (105, 106, 107) and the output aperture so as to allow electron transport through said electron beam guidance cavity (120, 121, 122), an accelerating grid (140) unit for accelerating the electrons leaving said cavity, and a main electron lens (150) for focusing the accelerated electrons on a display screen (170). According to the invention, said accelerating grid unit (140) further comprises a plurality of grids (G3, G4, G5) together constituting a pre-focus lens.
    Type: Application
    Filed: August 23, 2002
    Publication date: March 6, 2003
    Inventors: Willibrordus Adrianus Johannes Antonius Van Der Poel, Nijs Cornelis Van Der Vaart
  • Patent number: 6522057
    Abstract: The screen electrode in an electron gun for use in a cathode ray tube has multi-stage apertures such that the entrance area of an aperture is larger than the exit area. This has an effect of smaller screen electrode apertures with a result of increased pre-focusing of electron beams passing through the apertures. Thus, increased pre-focusing reduces the beam incident angle to the main lens. A smaller beam incident angle generates less spherical aberration in the main lens.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: February 18, 2003
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Sang-hoon Lee
  • Publication number: 20030025437
    Abstract: The present invention provides a cathode ray tube which exhibits a favorable contrast by enhancing a speed modulation effect. A front-stage anode electrode and a focus electrode which constitute an electron gun are respectively divided into a plurality of portions. A plurality of portions of the divided front-stage anode electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. A plurality of portions of the divided focus electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. Due to gaps formed in the front-stage anode electrode and the focus electrode, the speed modulation effect is increased.
    Type: Application
    Filed: July 12, 2002
    Publication date: February 6, 2003
    Inventors: Syoichi Wakita, Nobuyuki Suzuki, Toshio Nakayama, Yasuo Tanaka, Kouichi Hirasaka
  • Patent number: 6507143
    Abstract: A cathode ray tube has an anode of a large-diameter cylinder portion on its phosphor screen side and a small-diameter cylinder portion on its cathode side connected together, and a focus electrode formed of a large-diameter cylinder portion of a diameter larger than that of the small-diameter cylinder portion of the anode and a small-diameter cylinder portion having a diameter smaller than that of the small-diameter cylinder portion of the anode, the large-diameter and small-diameter cylinder portions being connected together. The large-diameter cylinder portion of the focus electrode is disposed concentrically within the large-diameter cylinder portion of the anode. The anode and a first electrode facing a cathode side end of the focus electrode are electrically connected together within the cathode ray tube. The following relationship is satisfied: −LP+184.9≧LG4≧0.0004 LP3−0.1571 LP2+21.006 LP−922.41, LP≧131.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: January 14, 2003
    Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd
    Inventors: Shoichi Wakita, Yasuo Tanaka, Toshio Nakayama, Nobuyuki Suzuki, Shoji Shirai
  • Publication number: 20020185957
    Abstract: Each of an anode and one of the sub-electrodes of a main lens of a shadow mask color cathode ray tube includes a first member having a single opening in their facing ends, and a second member having three beam apertures, wherein (A+566)/106>H−2×S is satisfied, where A is V1×V2×T, V1 is a vertical diameter of the opening, V2 is a vertical diameter of the center beam aperture, T is a distance between the opening and the second electrode member, H is a horizontal diameter of the opening, S is P×L/Q, where P is a horizontal center-to-center spacing between adjacent phosphor elements, Q is a spacing between the phosphor screen and the shadow mask, and L is a distance between the shadow mask and the opening in the first member.
    Type: Application
    Filed: August 8, 2002
    Publication date: December 12, 2002
    Inventors: Go Uchida, Shoji Shirai
  • Patent number: 6492767
    Abstract: An electron gun for a color cathode ray tube includes a first electrode, a second electrode and a third electrode. A waveform alternating voltage or a static voltage is applied to the first electrode in which three vertical slot type electron beam passing holes are formed. The second electrode is installed at one side of the first electrode in which circular electron beam passing holes are formed. The third electrode is disposed at the other side of the first electrode. A single horizontal slot type electron beam passing hole is formed in the third electrode to which the same dynamic focus voltage as that in the second electrode is applied.
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: December 10, 2002
    Assignee: Samsung SDI Co., Ltd.
    Inventor: Min-cheol Bae
  • Patent number: 6479926
    Abstract: The electron gun of a cathode ray tube comprises a main electron lens portion consisting of at least four electrodes arranged in the order of first grid (5), second grid (6), third grid (7) and fourth grid (8). An intermediate first voltage and an anode voltage are applied to the first grid (5) and the fourth grid (8), respectively. A resistor (100) is connected at one end to the second grid (6) and at the other end to the third grid (7) positioned adjacent to the second grid, with the result that second and third voltages of substantially the same potential, which are intermediate between the first voltage and the anode voltage, are applied to the second grid and the third grid, respectively. These grids are arranged such that a second electrostatic capacitance between the second and third grids (6, 7) is smaller than any of a first electrostatic capacitance between the first and second grids (5, 6) and a third electrostatic capacitance between the third and fourth grids (7, 8).
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: November 12, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Awano, Junichi Kimiya
  • Patent number: 6472832
    Abstract: A sixth grid, which is part of a main electron lens section, is made up of a first anode, an auxiliary electrode and a second anode. A fifth grid is applied with an intermediate voltage. The first and second anodes are applied with an anode voltage. An intermediate electrode and the auxiliary electrode are applied with a voltage whose level is between the levels of the intermediate voltage and anode voltage.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: October 29, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Kimiya, Shigeru Sugawara, Syunji Ookubo
  • Patent number: 6445116
    Abstract: A color cathode ray tube includes a three-color phosphor screen, a shadow mask spaced from the phosphor screen and a three-beam type electron gun. The main lens section includes a focus electrode and an anode facing the focus electrode, each of the focus electrode and the anode has an electrode having a single opening common for three electron beams in an end thereof facing each other and a plate electrode disposed therein. The focus electrode is formed of at least one first sub-electrode adapted to be supplied with a first focus voltage and at least one second sub-electrode adapted to be supplied with a second focus voltage, one of the at least one first sub-electrode and the at least one second sub-electrode faces the anode. The second focus voltage is a fixed voltage superposed with a dynamic voltage varying with beam deflection, and an electrostatic quadrupole lens is formed between a first one of the at least one first sub-electrode and a first one of the at least one second sub-electrode.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: September 3, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Go Uchida, Shoji Shirai
  • Publication number: 20020109452
    Abstract: An electron gun for a cathode ray tube and a cathode ray tube using such electron gun is provided. The electron gun includes a cathode for emitting an electron beam; a plurality of grid electrodes aligned sequentially from the cathode, one of the grid electrodes including a plurality of focusing electrodes that are mounted with a predetermined gap therebetween; a support for fixing the grid electrodes in their aligned arrangement; and a shield electrode mounted covering the gap(s) of the focusing electrodes and extending a predetermined distance over the focusing electrodes. The cathode ray tube includes the electron gun; a neck, within which the electron gun is mounted; and a scanning velocity modulation coil mounted on an outer circumference of the neck corresponding to the positioning of the gap(s) of the focusing electrodes.
    Type: Application
    Filed: January 16, 2002
    Publication date: August 15, 2002
    Inventors: Se-Ja-Chul Hwang, Duk-Sung Park, Yeong-Guon Won, Bong-Wook Jung
  • Patent number: 6433469
    Abstract: A cathode ray tube includes an evacuated envelope having a panel portion having a phosphor screen, a neck portion and a funnel portion connecting the panel portion and the neck portion; an electron gun housed in the neck portion having a cathode, a first grid electrode, a second grid electrode, plural focus electrodes and an anode arranged in the order named and fixed in predetermined axially spaced relationship by two glass beads; a voltage-dividing resistor attached to one of the two glass beads for producing an intermediate voltage to be applied to a first one of the plural focus electrodes adjacent to the anode by dividing a voltage applied to the anode; and a metal conductor facing and attached to a second one of the plural focus electrodes to surround the voltage-dividing resistor and the one of the two glass beads, the second one of the plural focus electrodes being disposed upstream of the first one of the plural focus electrodes.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: August 13, 2002
    Assignees: Hitachi, Ltd., Hitachi Electonic Devices Co., Ltd.
    Inventors: Atsushi Tsuruoka, Sakae Ishii, Satoru Miyamoto, Hisao Nakamura
  • Patent number: 6424084
    Abstract: In the electron gun assembly of a cathode ray tube, a main electron lens portion is formed by a fifth grid to an eighth grid, and incorporates a quadrupole lens. The fifth grid receives a voltage obtained by superposing, on a voltage as a reference voltage, a dynamic voltage that parabolically changes with an increase when the electron beam is deflected amount of the electron beam. The sixth grid receives a voltage obtained by superposing, on a voltage as a reference voltage, a dynamic voltage that parabolically changes with an increase when the electron beam is deflected amount of the electron beam. The seventh grid receives the voltage, while the eighth grid receives an anode voltage.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: July 23, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Kimiya, Takashi Awano, Shigeru Sugawara
  • Patent number: 6424104
    Abstract: A color CRT is driven by focusing and accelerating an electron beam emitted from a cathode by forming electron lenses including a quadrupole lens by applying a predetermined voltage to the cathode of an electron gun installed in a neck portion of a funnel and each of electrodes, focusing the electron beam on a fluorescent film by applying a voltage having a horizontal dynamic waveform having a ratio of slopes of 6.85 or more between a unilateral area of 90% and a unilateral area of 50% of a raster area to which a video signal of an image is applied, to at least one of the electrodes forming the quadrupole lens, synchronized with a horizontal deflection signal of a deflection yoke installed at a cone portion of the funnel, in order to deflect an electron beam emitted from the electron gun and scan the deflected electron beam onto the fluorescent film of a panel sealed to the funnel, and forming an image by having the deflected electron beam land on the fluorescent film and excite the fluorescent film.
    Type: Grant
    Filed: June 21, 2001
    Date of Patent: July 23, 2002
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Min-cheol Bae, Yong-geol Kwon
  • Patent number: 6414424
    Abstract: In an inline type electron gun incorporated in a color cathode ray tube, a plurality of electron beams are produced from each of cathodes. A plurality of beam apertures are formed, per cathode, in a first grid and a second grid of the electron gun. The second grid consists of a plurality of split grids spaced apart from each other in the traveling direction of electron beams. The beam apertures formed in at least one of the split grids constituting the second grid are positionally eccentric to the beam apertures formed in another split grid. A voltage of a waveform synchronized with a deflection period is impressed from a circuit in a display apparatus to at least one of the split grids constituting the second grid. And the electron lens effect of the second grid is changed in accordance with the impressed voltage waveform, thereby correcting the positional deviation of the plural electron beams caused in the peripheral area of a fluorescent screen.
    Type: Grant
    Filed: February 7, 2000
    Date of Patent: July 2, 2002
    Assignee: Sony Corporation
    Inventor: Yasunobu Amano
  • Patent number: 6404149
    Abstract: An electron gun assembly forms an electron beam generator, pre-focusing lens, sub-lens, and main lens. The sub-lens has a weaker horizontal focusing power than the vertical one, and the main lens has a stronger horizontal focusing power than the vertical one. When the electron beam is not deflected, a first quadrupole lens is formed between the pre-focusing lens and sub-lens, and a second quadrupole lens is formed between the sub-lens and-main lens. At least one grid forming each of the first and second quadrupole lenses receives a dynamic focusing voltage which parabolically changes in synchronism with the deflection magnetic field and becomes higher when the electron beam is deflected than when it is not deflected.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: June 11, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Ueno, Tsutomu Takekawa
  • Patent number: 6400105
    Abstract: A focus electrode is constituted by a first type of focus electrode group to which a first focus voltage is applied, and a second type of focus electrode group to which a second focus voltage is applied. Between the first type of focus electrode group and the second type of focus electrode group are formed a lens at least having a lens action for correcting the field curvature and an electrostatic quadrupole lens. The center axes of the outer electron beam passage holes in the first type of focus electrode forming the lens at least having a lens action for correcting the field curvature are deviated on a horizontal plane from the center axes of the outer electron beam passage holes in the second type of focus electrode. The electrostatic quadrupole lens produces dissimilar intensities for the outer electron beams and for the center electron beam.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: June 4, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Go Uchida, Syoji Shirai, Shinichi Kato, Masafumi Nagaoka
  • Patent number: 6396221
    Abstract: A color cathode-ray tube including a main lens section comprising an anode to which an anode voltage is applied, and a focus electrode. The focus electrode has first type of focus electrode group to which a first focus voltage is applied, and a second type of focus electrode group to which a second focus voltage is applied which is obtained by superposing on a predetermined voltage a voltage that changes depending upon the deflecting amount of the electron beams. Between the first type of focus electrode group and the second type of focus electrode group are formed in a dynamic lens and an electrostatic quadrupole lens. Three electron beam passage holes are formed in the electrodes that form the dynamic lens and the centers for the outer electron beam passage holes in the first type of focus electrode group are deviated relative to the centers of the outer electron beam passage holes in the second type of focus electrode group in the horizontal direction.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: May 28, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Go Uchida, Syoji Shirai, Shinichi Kato, Masafumi Nagaoka