Plural Cathodes Patents (Class 313/302)
  • Patent number: 10186920
    Abstract: This invention relates to the development of super energy efficient coils with which different electrical appliances like electric fans and motors can be manufactured, by using New Free Electron Wire. The copper coils of fans and motors can be replaced by closed looped coils of new free electron wire, which will make them highly energy efficient. A very small copper coil wound on New Free Electron Wire will act as a connector which will make the fans and motors as user friendly as that of copper coil fans and motors but will be several hundred times energy efficient than any normal copper coil, fans and motors of its kind, currently available in the market. The replacement of Teflon with Silicon Rubber resolves the problem of joining and molding the body of New Free Electron Wire.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: January 22, 2019
    Assignee: FREE ELECTRON ELECTRICALS PRIVATE LIMITED
    Inventor: Sabyasachi Haldar
  • Patent number: 9307662
    Abstract: This invention relates to New Free Electrons Wire (4a, b), which will enable the use of electrical energy and also energy in various other forms in a loss free way at room temperature. Free Electrons confined in vacuum (4a1) at the order of 10?4 torr or more, at the core of the wire, can move a distance as long as about, to a few kilometers without any collision. The vacuum is maintained in a tube made up of alternate layers of Teflon (4a2) and Silicon Oxynitride (4a3) The columbic repulsion between these free electrons (4b1, 4b2, 4b3 . . . ) will actually conduct energy without any loss. The free electrons trapped in vacuum tube (4a), should be at a particular density of around 2.02×108 electrons in the area covered by the input device (4b4) or output device (4b5) and also all along the Free Electron Wire. The input device (4b4) is to deliver energy to the free electrons (4b1, 4b2, 4b3 . . . ) of the New Free Electrons Wire (4a, b), for loss free transportation and various other uses of energy.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: April 5, 2016
    Inventor: Sabyasachi Haldar
  • Patent number: 8803410
    Abstract: The present disclosure relates to a field emission device. The field emission device includes a carbon nanotube structure and two electrodes electrically connected with the carbon nanotube structure. The carbon nanotube structure includes a carbon nanotube array, a carbon nanotube layer located on one side of the carbon nanotube array, and a carbon nanotube cluster between the carbon nanotube array and the carbon nanotube layer. The carbon nanotube array includes a number of first carbon nanotubes that are parallel with each other. The carbon nanotube layer includes a number of second carbon nanotubes. The carbon nanotube cluster includes a plurality of third carbon nanotubes that are entangled around both the plurality of first carbon nanotubes and the plurality of second carbon nanotubes.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: August 12, 2014
    Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.
    Inventors: Peng Liu, Kai-Li Jiang, Shou-Shan Fan
  • Publication number: 20130293090
    Abstract: The present disclosure relates to a field emission device. The field emission device includes a carbon nanotube structure and two electrodes electrically connected with the carbon nanotube structure. The carbon nanotube structure includes a carbon nanotube array, a carbon nanotube layer located on one side of the carbon nanotube array, and a carbon nanotube cluster between the carbon nanotube array and the carbon nanotube layer. The carbon nanotube array includes a number of first carbon nanotubes that are parallel with each other. The carbon nanotube layer includes a number of second carbon nanotubes. The carbon nanotube cluster includes a plurality of third carbon nanotubes that are entangled around both the plurality of first carbon nanotubes and the plurality of second carbon nanotubes.
    Type: Application
    Filed: December 11, 2012
    Publication date: November 7, 2013
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD., TSINGHUA UNIVERSITY
    Inventors: PENG LIU, KAI-LI JIANG, SHOU-SHAN FAN
  • Patent number: 7608202
    Abstract: There is provided a phosphor emitting light of high brightness and having high weatherability, which has a composition represented by the following general formula: (M11?yRy)aMgM2bM3cOa+2b+(3/2)cX2 wherein M1 is at least one element selected from the group consisting of Ca, Sr, Ba, Zn and Mn, M2 is at least one element selected from the group consisting of Si, Ge and Sn, M3 is at least one element selected from the group consisting of B, Al, Ga and In, X is at least one element selected from the group consisting of F, Cl, Br and I, R is at least one element selected from the group consisting of rare earth elements with Eu being an inevitable element, and y, a, b and c satisfy the following relationships of 0.0001?y?0.3, 7.0?a<10.0, 3.0?b<5.0 and 0?c<1.0.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: October 27, 2009
    Assignee: Nichia Corporation
    Inventor: Yoshinori Murazaki
  • Patent number: 7449825
    Abstract: A double-faced field emission display device includes two parallel fluorescent screens (10, 10?) and an electron emission structure (20) located between the fluorescent screens. Each fluorescent screen includes a transparent substrate (21, 21?) with an anode plate (12, 12?) and coplanar fluorescent layers (13, 13?) formed at an inner surface of the transparent substrate. The electron emission structure includes an opaque insulative substrate (28) with cathode plates (26, 26?), electron emitters (27, 27?) and grid plates (25, 25?) formed at each of opposite surfaces (281, 282) thereof. Symmetrically opposite pairs of same electrodes are electrically interconnected so that the fluorescent screens can simultaneous display a same image. Only a single driving system is needed to achieve the simultaneous display.
    Type: Grant
    Filed: April 27, 2005
    Date of Patent: November 11, 2008
    Assignees: Tsinghua University, Hon Hai Precision Industry Co., Ltd.
    Inventors: Pi-Jin Chen, Peng Liu, Li Qian, Yang Wei, Lei-Mei Sheng, You-Hua Lei, Liang Liu, Shou-Shan Fan
  • Patent number: 7079093
    Abstract: An organic light emitting diodes display device includes a number of data lines, scan lines, and cathode electrodes. These scan lines are perpendicular to the data lines to form a number of pixels, each of which possess a pixel area respectively. All the pixels areas form a pixel area array. These cathode electrodes are parallel to the scan lines or data lines and partially cover the pixel area array. Spaces between each two cathode electrodes are above the scan lines or data lines to avoid the parasitic capacitance between the cathode electrodes and scan lines or data lines. And thus the resistance capacitance time delay is prevented.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: July 18, 2006
    Assignee: Au Optronics Corp.
    Inventor: Wein-Town Sun
  • Patent number: 6870312
    Abstract: A patterned field emission device fabricated using conducting or semiconducting organic materials is described.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: March 22, 2005
    Assignee: Massachusetts Institute of Technology
    Inventors: Ioannis Kymissis, Akintunde Ibitayo Akinwande
  • Patent number: 6762540
    Abstract: A cathode assembly (43) for a computed tomography scanning system (10) is provided. The cathode assembly (43) includes a one-piece tab assembly (52) for simple and relatively quick installation on a cathode cup (44). In one embodiment, the one-piece tab assembly (52) has two rail portions (56) extending substantially across its length. These rail portions (56) are intended for insertion into channels (50) formed within the cathode cup (44) and for properly locating the one-piece tab assembly (52) in a desired position relative to the filament (46). The assembly (52) further includes two tab portions (58, 58″) located on opposing ends of the rail portions (56). The tab portions (58, 58″) each include a main body portion (62) and a flap portion (54) extending from the main body portion (62). The main body portion (62) extends between the two rail portions (56) and has a mounting surface for attaching the one-piece tab assembly (52) to the cathode cup (44).
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: July 13, 2004
    Assignee: GE Medical Systems Global Technology Company, LLC
    Inventors: Thomas D. Schaefer, J. Scott Price, Sergio Lemaitre
  • Patent number: 6756729
    Abstract: A flat panel display includes a faceplate, a backplate combined with the faceplate to form a vacuum fight cell, and a light emission unit placed within the cell to emit light from the cell. The backplate has a plurality of electron emission sources. A frame is mounted on the backplate with opening portions. The electron emission sources are exposed through the opening portions of the frame toward the faceplate. A plurality of spacers are formed on the frame such that the spacers are positioned at a non-display area within the cell. A plurality of gate electrodes are formed at a surface of the frame with a predetermined pattern. The gate electrodes has opening portions communicating with the opening portions of the frame.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: June 29, 2004
    Assignee: Samsung SDI Co., Ltd.
    Inventors: Yang-Woon Na, Jong-Hun You
  • Patent number: 6611094
    Abstract: A simple and slim double-faced vacuum fluorescent display device has no grid, thereby lowing the power consumption and fabrication cost thereof. Anode electrodes on one of the front plate and the back plate function as grids for anode electrodes on the other one of the front plate and the back plate. The light emitted from anode electrodes is not blocked by grids, thereby enhancing light emitting efficiency thereof.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: August 26, 2003
    Assignee: Futaba Denshi Kogyo Kabushiki Kaisha
    Inventors: Yukio Ogawa, Kazuyoshi Ishikawa, Katsutoshi Kougo, Yoshikazu Iidaka, Hiroaki Kawasaki
  • Patent number: 5783900
    Abstract: A broad-beam high energy electron accelerator has an electron injection section arranged for increased current density with greater uniformity and higher transmission through the foil exit window. A plurality of cathode rods are disposed in a transverse plane and spaced at about 2.4 cm, and a reflector plate behind the cathode rods is biased negative relative thereto. A planar control grid is disposed distal of said cathode rods and a screen grid is disposed parallel to and distal of the control grid. Field-shaping wires are disposed in a plane parallel to the plane of the cathode rods and between the same and the reflector plate, with the respective field-shaping wires being disposed parallel to said rods and midway between them. The same positive bias (e.g., 11 kV) is applied to both the control grid and the field-shaping wires.
    Type: Grant
    Filed: September 23, 1996
    Date of Patent: July 21, 1998
    Assignee: Virginia Accelerators, Inc.
    Inventors: Stanley Humphries, Jr., Ralph D. Genuario
  • Patent number: 5760417
    Abstract: In a semiconductor electron emission device for causing an avalanche breakdown by applying a reverse bias voltage to a Schottky barrier junction between a metallic material or metallic compound material and a p-type semiconductor, and externally emitting electrons from a solid-state surface, a p-type semiconductor region (first region) for causing the avalanche breakdown contacts a p-type semiconductor region (second region) for supplying carriers to the first region, and a semi-insulating region is formed around the first region.
    Type: Grant
    Filed: March 27, 1995
    Date of Patent: June 2, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuo Watanabe, Norio Kaneko, Masahiko Okunuki, Takeo Tsukamoto
  • Patent number: 5679960
    Abstract: A device for emitting electrons, comprising a substrate, an insulating film formed on a surface of the substrate and having a recess, an emitter electrode formed on the insulating film and having an edge portion located at the recess, the edge portion of the emitter electrode being formed in the form of an arch within a plane perpendicular to the surface of the substrate so as to be sharpened toward a distal end of the emitter electrode, the edge portion of the emitter electrode being sharpened also in a planar direction parallel to the surface of the substrate toward the distal end of the emitter electrode so as to have a linear portion at the distal end, and the edge portion of the emitter electrode being adapted to emit electrons from the linear portion when an electric field is applied to the edge portion of the emitter electrode, and a gate electrode formed on the insulating structure and having an edge portion located at the recess and opposing the edge portion of the emitter electrode via a gap, the ed
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: October 21, 1997
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshiaki Akama
  • Patent number: 5629716
    Abstract: A plurality of filaments are stretched in parallel on a rear plate, and an insulating plate is provided so as to cover the filaments. In the insulating plate, a plurality of through-holes are formed along the longitudinal direction of the respective filaments for exposing parts thereof. Each through-hole and phosphor layers, which are provided on the insulating layer adjacent to the through-hole, constitute one unit picture element. The respective phosphor layers in the respective picture element are installed in a plurality of cavities formed in a rib provided on a lower surface of the insulating plate, whereby separated from the neighboring phosphor layers. The respective cavities function as a discharge room, with a light-transmissive front plate, formed on the rib, as a lid and a portion of the insulating plate corresponding to the phosphor layer as a bottom. The respective discharge rooms overlap the through-hole at one end in the longitudinal direction thereof.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: May 13, 1997
    Assignee: Matsushita Electronics Corporation
    Inventors: Takio Okamoto, Kazunori Hirao, Toru Hirayama, Hajime Mae, Takao Wakitani, Yukiharu Ito, Kouichi Nomura, Seiji Matsubara
  • Patent number: 5300857
    Abstract: An image display device displays an image based on visible fluorescent radiation caused by electron beams emitted from a plurality of parallel spaced filamentary cathodes that extend over a substrate. A pair of support bars fixed to opposite sides of the substrate has a pair of spaced arrays of through holes defined therein, and supports a pair of spaced arrays of electrically conductive pins extending through through holes, with a plurality of electrically insulating bodies disposed around the electrically conductive pins and fitted in the through holes, respectively. Each of the filamentary cathodes has opposite ends secured to the support member and held against outer circumferential surfaces of one pair of electrically conductive pins of the spaced arrays.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: April 5, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kanji Imai, Seiichi Taniguchi, Mitsunori Katano, Fumio Yamazaki, Toshifumi Nakatani
  • Patent number: 5272419
    Abstract: A flat, visible display device includes a backing plate and electrode, cathode wires extending parallel thereto, a face plate with a phosphorescent screen, an anode electrode, and an address plate with first and second addressing electrodes arranged in a crossing matrix pattern to selectively scan electrons. A first accelerating electrode is installed parallel to the same to form a thermal electron output section. Thermal electrons are accelerated to the electric field of the accelerating electrode to which a positive voltage is applied to form a space charge cloud of free electrons between the address plate and the accelerating electrode. The first and second addressing electrodes are selectively supplied with voltage to pass electrons through the apertures of the address plate to form a picture on the screen. The second addressing electrode is supplied with positive voltage, and backing and cut-off electrodes are supplied with a negative voltage to form a preliminary space charge cloud of free electrons.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: December 21, 1993
    Assignee: Samsung Electron Devices Co., Ltd.
    Inventor: Cheolwoo Park
  • Patent number: 5126628
    Abstract: A flat display includes a front panel having a fluorescent screen on its rear side, a rear panel defining a flat space with the front panel, linear filament cathodes arranged close to the rear panel, and an address electrode plate having a multiplicity of apertures and disposed close to the front panel. The rear panel is formed on its inner surface with spacer ridges each extending on each side of each filament cathode therealong and having a height to reach the address electrode plate. The spacer ridges give the flat display improved strength against pressure.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: June 30, 1992
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Shunichi Kishimoto, Yasuo Funazo, Katsumi Terada, Goro Hamagishi, Kazuhiko Takeuchi, Daisuke Takemori, Takashi Ikeda
  • Patent number: 4994708
    Abstract: A cold cathode device wherein a cold cathode and an anode face each other with an electron transit path intermediated therebetween, and one or more control electrodes structurally insulated from the said cathode and the anode, are provided exposing to the electron transit path. A cold cathode vacuum tube has an electron emission element having a p-type semiconductor region on an electron emission side and a work function lowering region with junctional relation to the p-type semiconductor region; and a plate electrode structurally insulated from the electron emission element by using an insulation layer which is formed with an electron transmit path corresponding in position to an electron emission area of the electron emission element.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: February 19, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Shimizu, Takeo Tsukamoto, Akira Suzuki, Masao Sugata, Isamu Shimoda, Masahiko Okunuki
  • Patent number: 4794306
    Abstract: In a flat picture-reproducing device having a phosphor-coated faceplate (1) and a tray-shaped rear housing (2), a cathode formed by a periodic array of heating wires (7) is provided. This heating-wire array is followed by layers of focusing wires (8) and attracting wires (9) and by a perforated anode (5). A segmented counterelectrode (6) is located behind the heating wires (7).
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: December 27, 1988
    Assignee: Standard Elektrik Lorenz AG
    Inventors: Kurt-Manfred Tischer, Harald Rose, Rainer Spehr, Gerald Schonecker
  • Patent number: 4745324
    Abstract: A high-power switch tube is shown constructed from a plurality of electron guns each gun having a cathode and an anode. Between the cathode and anode is mounted a shadow grid closest to the cathode beyond which is mounted a control grid, a screen grid, and, in some applications, by a suppressor grid. Each anode is formed with an anode cavity having an opening that is smaller in dimension than the largest dimension of the cavity thus forming a Faraday cage collector which prevents secondary emission problems.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: May 17, 1988
    Assignee: Litton Systems, Inc.
    Inventor: Richard B. True
  • Patent number: 4719388
    Abstract: A flat visual display device is disclosed herein and includes a flat face plate having a front face and an opposite back face and electrically positive means on the latter which, as a result of the impingement of the electrons thereon, provides a visual image through the front face of the face plate. The device utilizes an arrangement including cathode means for establishing a uniformly dense space-charge cloud of free electrons within a planar band parallel with and rearward of the back face of the display face plate. Means including an apertured address plate disposed in spaced-apart confronting relationship with the back face of the face plate between the latter and the uniform space-charge cloud acts on the electrons within the cloud in a controlled way so as to cause the electrons acted upon to impinge on specific areas of the electrically positive back face plate means of the display face plate in order to produce a desired image through the face plate's front face.
    Type: Grant
    Filed: August 13, 1985
    Date of Patent: January 12, 1988
    Assignee: Source Technology Corporation
    Inventor: Frederick G. Oess
  • Patent number: 4659964
    Abstract: A display tube comprising in an evacuated envelope (1) an electron gun system (6) for generating and focusing by means of a focusing lens at least two electron beams (28 to 35) on a display screen (5), which electron beams are deflected by deflection means and describe a frame on the display screen. The electron gun system (6) comprises at least two electron sources (20 to 26), the electrons in each electron beam being accelerated immediately after leaving the electron source by means of an electric field having a field strength exceeding 600 V/mm. The central axes (36) of the electron beam extend substantially parallel to each other, and all beams are converged by the focusing lens in the immediate proximity of the focus of the focusing lens, after which each separate beam is focused on the display screen by the focusing lens to form a spot.
    Type: Grant
    Filed: December 4, 1984
    Date of Patent: April 21, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Johannes H. T. van Roosmalen
  • Patent number: 4631452
    Abstract: An electric discharge apparatus, for example a gas laser or discharge lamp, includes first and second electrodes defining a first discharge path and third and fourth electrodes defining a second discharge path alongside the first. A respective impedance is associated with any electrical connection between electrodes. The electrodes are electrically arranged such that either the current flow of a discharge along the first path is so different from the current flow of a discharge along the second path that, overall, the discharges repel one another, or stable electric discharges which coalesce are generated between respective electrodes of the first and second sets.A multi-electrode plasma torch is also provided comprising an electrode holder from which a plurality of electrodes project and a pilot electrode common to more than one of the electrodes.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: December 23, 1986
    Assignee: Loughborough Consultants Limited
    Inventor: John E. Harry
  • Patent number: 4551648
    Abstract: A heater and support structure for a line cathode includes heater electrodes and an S-shaped cathode support member arranged between the heater electrodes. The heater electrodes and the S-shaped support member have a higher resistance than the cathode and thus heat flows into the cathode to compensate for heat radiation losses and the support compensates for thermal expansion to retain the cathode at a substantially constant position.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: November 5, 1985
    Assignee: RCA Corporation
    Inventor: Robert A. Gange
  • Patent number: 4527090
    Abstract: The invention provides a laser arrangement including in its discharge circuit a switching thyratron which is capable of conduction normally in one direction and protectively in the reverse direction. The thyratron has an anode formed as a hollow body which is adapted to retain plasma generated during a pulse of forward conduction so that the anode is provided to act as a cathode permitting protective reversal of the thyratron when this is subject to reversal of voltage.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: July 2, 1985
    Assignee: English Electric Valve Company Limited
    Inventors: Hugh Menown, Barry P. Newton, Christopher V. Neale
  • Patent number: 4499405
    Abstract: An improved broad beam electron gun having a hot cathode assembly which is comprised of cathode means for generating a substantially hemispherical space-charge distribution, the cathode means including electron emitting structures having principal electron emissive surfaces which lie in hypothetical cylindrical-shaped surfaces, the axes of revolution of which are coincident with the major axis of symmetry of the electron emitting structure, the major axis of symmetry being orthogonal to the plane of the anode, the electron emitting structures variously including concave filament sections which form a tip, cylinders and coils, and wherein an electron beam of broad, uniform cross-sectional area is obtained without a shaping grid.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: February 12, 1985
    Assignee: RPC Industries
    Inventor: Gary K. Loda
  • Patent number: 4469982
    Abstract: A electron-beam tube comprises a cathode (2) made as individual tapes (6) disposed throughout the length of the tube, whose surfaces are the emitting portions of the cathode (2). Each tape (6) of the cathode (2) is provided with a near-cathode focusing electrode (9) electrically connected to the cathode (2) and disposed in the immediate vicinity of the tape (6), and with a pair of rods (10) of the control electrode (3) disposed in relation to the tape (6) so that the whole electron flow focused by the near-cathode electrode (9) passes between said rods (10). The following relations are observed in the tube:a/b=c/d; 1<d/c.ltoreq.10; e.gtoreq.b.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: September 4, 1984
    Assignee: Vsesojuzny Energetichesky Institut Imeni V. I. Lenina
    Inventors: Vladimir I. Perevodchikov, Pavel I. Akimov, David A. Skibityansky, Valentina N. Shapenko, Lev V. Loginov, Alexandr L. Shapiro, Arkady N. Yakovlev, Vitaly M. Kosmachevsky
  • Patent number: 4410832
    Abstract: Apparatus and method are described for fabricating a long life cold cathode lectron beam semiconductor device (EBS). Fabrication is given of a vacuum tube structure capable of sustaining sufficiently high vacuum over extended time to prevent poisoning of the cold cathode and steps are give for growth of a plural tip cold cathode structure.
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: October 18, 1983
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Bernard Smith, Stanley Dubuske
  • Patent number: 4359666
    Abstract: A new method of fabricating a cylindrical segmented cathode by bending a photoetched bar-band to form a cylindrically-shaped cage and slipping it over a cylindrical electron emissive surface which will tightly fit inside the cage when the cathode is raised to its normal temperature. The bars of the band provide nonemissive segments of the cathode surface.
    Type: Grant
    Filed: July 21, 1980
    Date of Patent: November 16, 1982
    Assignee: Varian Associates, Inc.
    Inventor: Robert N. Tornoe
  • Patent number: 4345181
    Abstract: The edge effect elimination and beam forming device uses a field effect electron emitter with a conductive material disposed over selected portions of the emitting fibers of the emitter, in electrical contact with the fibers, and in the same plane as the fiber emitting points for eliminating electron emission in the area where the conductive material is placed. For edge effect elimination the conductive material is placed over the outer emitting fibers in a continuous path or ring. For additional beam shaping other segments or sections of the emitter surface may have conductive material deposited thereon to eliminate emission from that area, thereby shaping the beam emitted from the uncovered emitting points.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: August 17, 1982
    Inventor: Joe Shelton
  • Patent number: 4298814
    Abstract: A directly heated type cathode assembly comprises a ribbon filament to a substantially central portion of which an electron-emitting substance is attached through a metal plate, a first support member on which one end portion of the ribbon filament is fixed to support the ribbon filament, the first support member being electroconductive, a second support member for supporting that portion of the ribbon filament which is a little short of the other end of the ribbon filament, a conductive spring member fixed to the other end portion of the ribbon filament, and a conductive cathode cylinder supporting the first support member, second support member and spring member and having a base at the filament side, the base of the cylinder having at least one opening.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: November 3, 1981
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yukio Takanashi, Toshiharu Higuchi
  • Patent number: 4277718
    Abstract: In a high-power grid-controlled electron tube, a common anode receives electrons from a modular electron source having a common support structure to which are attached a plurality of modules. Each module has at least one cathode and grid mounted on a base which is individually attached to the support structure. The grids are approximately flat sheets of carbon with apertures to pass the electrons. Pyrolytic graphite is a preferred grid material.
    Type: Grant
    Filed: November 7, 1979
    Date of Patent: July 7, 1981
    Assignee: Varian Associates, Inc.
    Inventor: Merrald B. Shrader
  • Patent number: 4254357
    Abstract: A multi-arrayed electron emitter for microwave tubes in which the emitting urface is an array of continually replenished low-work-function regions, (micro-patches), whose boundaries include a control grid which is integral with the cathode surface and which controls emission from the low-work-function micro-patches. The continually replenished low-work-function regions are uniformly positioned relative to a matrix of uniformly spaced openings through which the low-work-function material is released.
    Type: Grant
    Filed: September 14, 1979
    Date of Patent: March 3, 1981
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: George A. Haas, Richard E. Thomas, Richard F. Greene
  • Patent number: 4223243
    Abstract: The variety of technologies that have been applied in the development of a onded grid cathode are described. These include chemical vapor deposition of tungsten, molybdenum, iridium BN, and Si.sub.3 N.sub.4 on both sides of a sintered tungsten cathode disk. Zirconium and titanium getters have been used to eliminate nitrogen evolution problems. The getter plates are also used as heat shields for the bonded heater. Films of Si.sub.3 N.sub.4 have been added to the insulation to prevent calcium and barium diffusion into the layer and maintain adequate resistivity and breakdown strength. Plasma etching was introduced as a method of removing Si.sub.3 N.sub.4 from the cathode pores.A new method, erosion lithography, is used for making the fine-detail grid structure, combining air erosion and lithographic techniques.
    Type: Grant
    Filed: May 9, 1979
    Date of Patent: September 16, 1980
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: David W. Oliver, Norman T. Lavoo
  • Patent number: 4163949
    Abstract: The tubistor is a device which incorporates features of both electron tubes and solid state devices such as a transistor and includes extremely close spacing between the multiple conducting elements of the device. The tubistor comprises a section of an oxide-metal composite that has been ion milled to produce inverted cones in the oxide with the emitting metal fibers at the bottom. A conducting layer deposited on the insulating layer surface forms a type of grid. A collector or anode disposed above the grid collects electrons emitted from the emitter when the appropriate potentials are applied to the device.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: August 7, 1979
    Inventor: Joe Shelton
  • Patent number: 4163172
    Abstract: A broad beam DC cold cathode electron gun with a plurality of plasma emitters formed by a capacitively coupled sliding spark assembly operable as a steady state as well as a pulsed device. Stabilization of the plasma emission current is attained through a feedback loop between the spark assembly and the grid bias supply.
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: July 31, 1979
    Assignee: Systems, Science and Software
    Inventor: Gary K. Loda
  • Patent number: 4121130
    Abstract: An insulating substrate is provided with a plurality of discrete electrode pads on a surface thereof. A thermionic line cathode, e.g., a directly heated filament, is positioned to one side of the substrate surface and extends across a surface of each one of the electrode pads. An apertured electrode is positioned in spaced relation to the cathode in a direction away from the surfaces of the electrode pads. The apertured electrode may include a single slit-shaped aperture or a plurality of colinear apertures. The structure may also include a pair of spaced parallel filter plates whose surfaces are disposed in parallel relation to the longitudinal axis of the line cathode and in orthogonal relation to the surfaces of the electrode pads. The filter plates function to collimate the electron flow emitted from the cathode.
    Type: Grant
    Filed: April 4, 1977
    Date of Patent: October 17, 1978
    Assignee: RCA Corporation
    Inventor: Robert Allen Gange
  • Patent number: 4091306
    Abstract: Thermionic filaments are arranged in an array which covers a predetermined area. A spreader electrode which may be in the form of a flat plate is placed on one side of the filaments with an anode being placed on the other side of the filaments, and an accelerator grid, focusing plate and collimation plate being placed in that order between the filaments and the anode. The anode is in the form of a foil through which the electrons pass into an area where they are utilized, such as for example a laser cavity where they are utilized to ionize the laser gas. The foil anode is supported on an apertured structure which facilitates the formation of a vacuum tight seal of the vacuum envelope containing the gun and functions as a heat sink to dissipate some of the heat energy developed in the foil.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: May 23, 1978
    Assignee: Northrop Corporation
    Inventor: William Hant
  • Patent number: 4080549
    Abstract: A high energy discharge apparatus uses a generally electron transparent thin foil anode of various configuration which is arranged parallel to and spaced apart between a pair of cathodes, and energized to create a potential difference between the anodes and cathodes causing electrons to be reflected back and forth through the foil anode with the concurrent discharge of ions being accelerated to the cathode.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: March 21, 1978
    Assignee: Physics International Company
    Inventors: John M. Creedon, Sidney D. Putnam, Ian D. Smith
  • Patent number: 4069436
    Abstract: A flat thermionic cathode is provided with a substrate having at least one main heating element thereon to produce at least one substantially localized area of heat and a sub-heating element to substantially define a heating area, the localized area being produced within the heating area. A cathode element including electron emissive material is disposed at the localized area. While the localized area tends to produce a temperature gradient directed from the localized area toward the perimeter of the substrate so as to create thermal stress in the substrate along the perimeter thereof, the sub-heating element reduces this temperature gradient and, consequently, the thermal stress.
    Type: Grant
    Filed: June 8, 1976
    Date of Patent: January 17, 1978
    Assignee: Sony Corporation
    Inventors: Akira Nakayama, Akio Ohkoshi, Shoichi Muramoto, Takehisa Natori, Koichiro Sumi, Hideaki Nakagawa, Torao Aozuka
  • Patent number: 4049993
    Abstract: A multi-digit fluorescent display tube comprising a multi-digit pattern display member including display units for respective digits disposed in parallel and composed of segment anodes, each segment anode having a phosphor layer, and at least one cathode stretched along the longitudinal direction of the pattern display member to confront the respective multi-digit pattern display units in common, wherein the cathode is disposed in an inclined manner and the perveance in each display unit is adjusted, so that when the cathode is heated and actuated by a direct current power source, the display brightness is substantially uniform in the display units for respective digits.
    Type: Grant
    Filed: May 25, 1976
    Date of Patent: September 20, 1977
    Assignee: Futaba Denshi Kogyo K. K.
    Inventors: Takao Kishino, Yukihiko Utamura
  • Patent number: 4045704
    Abstract: A multi-digit fluorescent display tube is disclosed. The display tube includes a plurality of indicating patterns arranged in a row in spaced side-by-side relational along the longitudinal width of a substrate, a filament stretched along the longitudinal direction of the indicating patterns and a control grid disposed between the filament and the indicating pattern, wherein the control grid is positioned in different plane distances with respect to the filament so as to adjust the perveance in each of the indicating patterns and to obtain an uniform brightness of the indicating patterns.
    Type: Grant
    Filed: June 10, 1976
    Date of Patent: August 30, 1977
    Assignee: Futaba Denshi Kogyo K. K.
    Inventors: Takao Kishino, Yukihiko Utamura
  • Patent number: 4020381
    Abstract: A flat cathode ray tube device is provided for display of information by response to an electron beam of a phosphor coating on a face plate. A monolithic structure includes an x-y matrix of electron source cathodes and a pair of grid arrays successively spaced from the matrix with holes therethrough adjacent to and aligned with the cathodes selectively to form and individually control the intensity of an electron beam from each of said cathodes. Deflection control structure has holes through which the beams may pass with a set of x-y deflection electrodes associated with each of the holes for x-y control of the trajectory of each of the beams. A support plate forms the base of the monolithic structure with the cathodes mounted thereon and a face plate structure marginally sealed to the support plate provides a vacuum tight envelope housing the monolithic structure.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: April 26, 1977
    Assignee: Texas Instruments Incorporated
    Inventors: Frederick G. Oess, Michael Peshock, Jr.
  • Patent number: 4011481
    Abstract: A grid-controlled electron tube is constructed with a common anode and an array of individual cathode-grid modules. The simple modules can be built with greater accuracy than large, complex electrodes. The modules can be individually tested before final assembly, and can be individually replaced in case of a failure during construction or later operation. In a preferred embodiment, the cathode is a cylindrical filament surrounded by a coaxial grid, each grid turn being mounted to a common support on the side opposite the anode. In a tetrode embodiment, additional focusing bars at the sides of the grid direct electrons into beams which pass between large screen-grid wires.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: March 8, 1977
    Assignee: Varian Associates
    Inventor: Donald H. Preist
  • Patent number: 3935500
    Abstract: A flat cathode ray tube device is provided for display of information by response to an electron beam of a phosphor coating on a face plate. A monolithic structure includes an x-y matrix of electron source cathodes and a pair of grid arrays successively spaced from the matrix with holes therethrough adjacent to and aligned with the cathodes selectively to form and individually control the intensity of an electron beam from each of said cathodes. Deflection control structure has holes through which the beams may pass with a set of x-y deflection electrodes associated with each of the holes for x-y control of the trajectory of each of the beams. A support plate forms the base of the monolithic structure with the cathodes mounted thereon and a face plate structure marginally sealed to the support plate provides a vacuum tight envelope housing the monolithic structure.
    Type: Grant
    Filed: December 9, 1974
    Date of Patent: January 27, 1976
    Assignee: Texas Instruments Incorporated
    Inventors: Frederick G. Oess, Michael Peshock, Jr.
  • Patent number: H216
    Abstract: An encapsulated planar cathode structure is formed for a vacuum tube. A multibeam cathode ray tube is obtained by heating in the CRT such a structure with a plurality of separated electron emissive layers to remove the encapsulation material. Positive photoresist technology is utilized: for obtaining delineated apertures on a planar metallization layer supported by an insulating substrate into which needle-shaped carbonate particles are deposited electrophoretically normal to the metallization; and for encapsulating the resultant cathodes.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: February 3, 1987
    Inventor: Bruce P. Piggin