Miscellaneous Discharge Devices Patents (Class 313/325)
  • Patent number: 10439366
    Abstract: To provide a discharge tube having improved stability of operating voltage to repeated discharges. The discharge tube includes a cylindrical insulating hollow body having openings at least at both ends and at least a pair of sealing electrodes facing to each other for closing the openings so as to seal a discharge control gas inside the body, wherein a discharge trigger film made of a conductive material is formed on the inner circumferential surface of the insulating hollow body, each of the sealing electrodes has a convex portion projecting into the insulating hollow body and a discharge active layer(s) that is/are made of a material having higher electron emission characteristics than that of the sealing electrodes.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: October 8, 2019
    Assignee: Mitsubishi Materials Corporation
    Inventors: Shinji Sakai, Yoshitaka Mayuzumi, Ryoichi Sugimoto
  • Patent number: 10072360
    Abstract: A yarn twisting device is simple in structure but capable of easily producing twisted yarn made of a plurality of yarn pieces twisted together. The yarn twisting device includes: a case; an operation wheel rotatably supported by the case so that an outer circumference of the operation wheel is partly exposed outside the case; and a plurality of yarn holding shafts supported by the case so as to protrude from one surface of the case and that axially rotate with the rotation of the operation wheel in the same direction.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: September 11, 2018
    Assignee: CLOVER MFG. CO., LTD.
    Inventor: Kumiko Nitta
  • Patent number: 9112310
    Abstract: Circuits, methods, and apparatus that may provide low-capacitance protection from electrostatic discharges. One example protects a circuit in a cable connector that is connected to cable connector contacts. This example may include a number of spark gaps that may be used for electrostatic discharge protection. These spark gaps may be formed using traces a printed circuit board. Signal traces to be protected may be routed such that they pass in close proximity to a ground pad, line, plane, area, or connection. When excessive electrostatic energy builds up on the signal trace, the energy may spark across a gap from the signal trace to the ground pad. The gap and parts of the signal traces and ground may be uncovered such that the electrostatic discharge may dissipate through the air.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: August 18, 2015
    Assignee: Apple Inc.
    Inventors: Erik James Shahohian, Vince Duperron
  • Patent number: 9072189
    Abstract: A substrate unit includes a conductive case, an insulating case arranged in the conductive case, a first screw member having conductivity, arranged in the conductive case and fixing the insulating case to an inner wall surface of the conductive case, a circuit substrate provided opposite to the inner wall surface with respect to the insulating case and fixed to the insulating case, and a second screw member having conductivity and fixing the circuit substrate to the insulating case. The first screw member and the second screw member are screwed in toward the inner wall surface. The first screw member and the second screw member are spaced from each other. The first screw member and the second screw member are connected to each other with a connecting member having conductivity.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: June 30, 2015
    Inventors: Hajime Kosugi, Ken Asakura
  • Patent number: 8994268
    Abstract: A compact strobe device includes the following components: a flash discharge tube having an anode and a cathode; a conductive reflector storing a part of the flash discharge tube; a trigger coil having a hollow core, and a primary winding and a secondary winding around the core; and a conductor connecting the secondary winding of the trigger coil and the reflector. The trigger coil has an end of the flash discharge tube inserted into the core, and includes at an end thereof adjacent to the reflector, a secondary terminal connected to the secondary winding. The reflector has a bottom in contact with the outer peripheral surface of the flash discharge tube, the outer peripheral surface covering at least the region extending from the anode to the cathode. The conductor has a first contact portion in contact with the secondary terminal of the trigger coil, and a second contact portion in contact with the bottom of the reflector.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: March 31, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Arata Sakamoto
  • Patent number: 8922120
    Abstract: A compact strobe device includes the following components: a flash discharge tube having an anode on one side thereof and a cathode on the other side thereof; a conductive reflector composing an external trigger electrode, the reflector being in contact with and storing a part of the flash discharge tube; a trigger coil having a primary winding and a secondary winding wound around a hollow core; and an elastic conductor connecting the secondary winding of the trigger coil and the reflector. The trigger coil has an end of the flash discharge tube inserted into the core, and includes, at the end thereof adjacent to the reflector, a secondary terminal connected to the secondary winding. The conductor elastically deforms to be in contact with the secondary terminal of the trigger coil and a lateral side of the reflector.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: December 30, 2014
    Assignee: Panasonic Corporation
    Inventor: Arata Sakamoto
  • Patent number: 8814620
    Abstract: Operation to produce an intermediate product for a crucible for a LUWPL is as follows: a) a body 2 is preheated and placed on a support, with its bore concentric with a tube 4 supported in a chuck and connected to a inflation means; b) the tube is heated with the chuck being rotated for evenness of heating; c) when the temperature of the tube is detected to be the softening point of the quartz of the tube, its rotation is stopped and it is advanced into a bore 3 in the body 2; d) advance is stopped when the distal, sealed end is detected to have reached a determined protrusion 18; e) simultaneously with the advance being stopped, inflation gas is admitted into the tube, to inflate it albeit it marginally, and bring its outer surface 5 into intimate contact with the surface 6 of the bore 4.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: August 26, 2014
    Assignee: Ceravision Limited
    Inventors: Floyd R. Pothoven, Andrew Simon Neate, Martyn Roscoe, Barry Preston
  • Publication number: 20130140976
    Abstract: A method of manufacturing a microfluidic chip includes: irradiating, with a laser light, an area to be provided with a valley for storing a fluid on a surface of a substrate so as to form a modified region having a periodic pattern formed in a self-organizing manner in a light-collecting area of the laser light, the laser light having a pulse width for which the pulse duration is on the order of picoseconds or less; carrying out an etching treatment on the substrate in which the modified region is formed, removing at least some of the modified portion so as to provide the valley, and forming a periodic structure having a plurality of groove portions along one direction which have a surface profile based on the periodic pattern on at least a bottom surface of the valley; and forming a metal layer that covers the periodic structure of the bottom surface.
    Type: Application
    Filed: February 4, 2013
    Publication date: June 6, 2013
    Applicant: FUJIKURA LTD.
    Inventor: FUJIKURA LTD.
  • Publication number: 20110215717
    Abstract: A spark gap switch for controlling the output of a high voltage pulse from a high voltage source, for example, a capacitor bank or a pulse forming network, to an external load such as a high gradient electron gun, laser, pulsed power accelerator or wide band radar. The combination of a UV laser and a high vacuum quartz cell, in which a photocathode and an anode are installed, is utilized as triggering devices to switch the spark gap from a non-conducting state to a conducting state with low delay and low jitter.
    Type: Application
    Filed: March 4, 2010
    Publication date: September 8, 2011
    Inventors: Ping Chen, Martin L. Lundquist, David U.L. Yu
  • Publication number: 20100231117
    Abstract: A display screen of a color display is disclosed (see FIG. 1). The display screen includes a glass plate having an array of three different color-emitting phosphors thereon. A graphite-based matrix is placed in the interstitial regions between each of the three different color-emitting phosphors. The graphite-based matrix is formed from an aqueous composition including graphite, potassium silicate and sodium silicate.
    Type: Application
    Filed: June 21, 2006
    Publication date: September 16, 2010
    Inventors: Barry Michael Cushman, David Paul Ciampa, James Francis Edwards
  • Publication number: 20100194261
    Abstract: The present invention is intended to evaluate outgoing light from a light emitting device including a structure in which four or more layers of thin films, including a light-emitting layer, are laminated, in a shorter period of computation time, as compared with conventional methods.
    Type: Application
    Filed: June 26, 2008
    Publication date: August 5, 2010
    Inventor: Fumihiro Sakano
  • Publication number: 20100176709
    Abstract: The invention relates to a lamp base (2), in particular a lamp base for a vehicle lamp, the lamp base having a plastic base part (20) with at least one moulded stub (21), wherein the plastics material of the plastic base part is mixed with reinforcing fibres (4), the orientation of which in the stub has a preferential direction. This allows the mechanical load-bearing capacity of the stubs to be advantageously increased.
    Type: Application
    Filed: August 17, 2007
    Publication date: July 15, 2010
    Inventors: Karin Dressel, Matthias Protsch, Thomas Schmidt-Lehmann
  • Patent number: 7548025
    Abstract: The invention proposes a lamp (1), in particular a halogen incandescent lamp for system voltage, having a luminous element (8), which is retained by pinches (10a, 10b) which are in the form of funnel-shaped turned-in sections in the end face (3) of the lamp vessel (2), the pinches (10a, 10b) being oriented essentially axially with respect to the longitudinal axis of the lamp (1).
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: June 16, 2009
    Assignee: Osram Gesellschaft mit beschraenkter Haftung
    Inventors: Rupert Goihl, Roland Stark
  • Publication number: 20090096346
    Abstract: The present invention relates to a sheet-shaped heat and light source. The sheet-shaped heat and light source includes a carbon nanotube film and at least two electrodes. The at least two electrodes are separately disposed on the carbon nanotube film and electrically connected thereto. The carbon nanotube film includes a plurality of carbon nanotubes arranging isotropically, along a fixed direction, or along different directions. Moreover, a method for making the sheet-shaped heat and light source and a method for heating an object adopting the same are also included.
    Type: Application
    Filed: December 29, 2007
    Publication date: April 16, 2009
    Inventors: Chang-Hong Liu, Shou-Shan Fan
  • Publication number: 20090015159
    Abstract: High-voltage switch, in particular for a microwave generator, which includes a spark gap which breaks down in order to switch when a high voltage is applied provided is a plurality of parallel-connected spark gaps (12, 12a, 12b), each having at least one electrode (13, 13a, 13b) with a series-connected fuse (14, 14a, 14b) which is irreversibly destroyed when the respective spark gap (12, 12a, 12b) breaks down.
    Type: Application
    Filed: July 8, 2005
    Publication date: January 15, 2009
    Inventors: Jurgen Urban, Geoffrey Staines
  • Publication number: 20030205960
    Abstract: An electromagnetic radiation source is provided which includes an anode and a cathode separated by an anode-cathode space. The source further includes electrical contacts for applying a dc voltage between the anode and the cathode and establishing an electric field across the anode-cathode space. At least one magnet is arranged to provide a dc magnetic field within the anode-cathode space generally normal to the electric field. A plurality of openings are formed along a surface of the anode which defines the anode-cathode space, whereby electrons emitted from the cathode are influenced by the electric and magnetic fields to follow a path through the anode-cathode space and pass in close proximity to the openings.
    Type: Application
    Filed: November 27, 2001
    Publication date: November 6, 2003
    Inventor: James G. Small
  • Patent number: 6559580
    Abstract: A spark gap switch, including a first planar electrode including a discharge portion and a support portion. The spark gap also includes a second planar electrode parallel to and spaced apart from the first electrode and includes a discharge portion and a support portion. The discharge portions are mutually opposite, and the support portions are mutually staggered.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: May 6, 2003
    Assignee: Rafael-Armament Development Authority Ltd.
    Inventors: Alon Deutsch, Avner Rosenberg
  • Publication number: 20030001479
    Abstract: It is sought to provide a negative ion generator, which can suppress positive ion generation, permits ready control of the quantity of generated negative ions and permits its size and thickness reduction. The negative ion generator 1 is of electron emission type in which, for negative ion generation, electrons are emitted into air by impressing a negative high voltage on a stylus electric discharge electrode 6. A piezoelectric transformer 5 is used for amplifying a non-rectified drive voltage from a transformer drive circuit 9. As a result of rectification of the AC high voltage from the piezoelectric transformer 5, a negative high voltage is obtained, which is impressed on the stylus electric discharge electrode 6 for electron emission wherefrom, thereby generating negative ions in air.
    Type: Application
    Filed: June 19, 2002
    Publication date: January 2, 2003
    Inventors: Yoshiaki Aiki, Wakao Sakamoto
  • Patent number: 6323599
    Abstract: A vertical spark gap assembly for electronic circuits employing poly silicon. The assembly permits dissipation of higher voltages in spark discharge without shorting in the circuit. The spark gap assembly includes a first partially conductive layer and a second partially conductive layer and a non-conductive material positioned between the layers and maintaining a vertically spaced apart relationship therebetween. At least one opening is provided in the first layer and the second layer with the non-conductive material removed from the layer having at least one opening. As such, the arrangement provides a vertical gap formed between and communicating with each layer.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: November 27, 2001
    Assignee: Mitel Corporation
    Inventor: Jonathan Harry Orchard-Webb
  • Patent number: 5909048
    Abstract: A native oxide film is formed on the surface of a silicon substrate. The native oxide film has at least island-shaped imperfect SiO.sub.2 regions not formed with a perfect SiO.sub.2 film. Before the native oxide film is formed, a mask layer having a necessary opening is formed over the silicon substrate, according to necessity. The silicon substrate is etched in a vapor phase via the imperfect SiO.sub.2 regions of the native oxide film to form a hollow under the native oxide film at least at a partial region thereof. An upper film is formed on the native oxide film to cover and close the imperfect SiO.sub.2 regions. In this manner, a minute hollow can be formed in the silicon substrate with good controllability.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: June 1, 1999
    Assignee: Fujitsu Limited
    Inventor: Rinji Sugino
  • Patent number: 5827438
    Abstract: The invention is related to an electrically modulatable thermal radiant source with a multilayer structure. The radiant source includes a substrate, a first insulating layer formed onto the substrate, a radiant surface layer formed onto the first insulating layer, a second insulating layer formed on the radiant surface layer, a first metallization (incandescent filament) layer formed on the second insulating layer, a third insulating layer formed on the first metallization layer, and a second metallization layer for contacting formed on the third insulating layer. According to the invention, very thin incandescent filaments are formed from the first metallization layer and surrounded by the other elements of the multilayer structure as a uniform, planar plate.
    Type: Grant
    Filed: November 22, 1996
    Date of Patent: October 27, 1998
    Assignee: Vaisala Oy
    Inventors: Martti Blomberg, Altti Torkkeli, Stefan Lindblad, Ari Lehto
  • Patent number: 5655210
    Abstract: A corona source suitable for use in vehicle ignition systems uses a conductive coil that receives an RF input at one end and has a corona discharge site at the other end, with a reference electrode capacitively coupled to the coil. The pitch and the length of the coil are selected to produce a corona discharge in response to an RF input signal at a predetermined frequency and voltage, through quarter wavelength resonation. Either the new resonant coil or other corona discharge devices can be used to remediate fluid-borne wastes by initiating and sustaining RF corona discharges within the fluid. The pulses used to initiate the corona discharge preferably have alternating positive and negative components, with high initial voltages on the positive components to initiate the discharge, followed by lower positive voltage levels to sustain the discharge. Unipolar pulses, preferably with progressively decreasing voltage levels, can also be used.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: August 5, 1997
    Assignee: Hughes Aircraft Company
    Inventors: Daniel J. Gregoire, Robin J. Harvey, Franklin A. Dolezal, Weldon S. Williamson
  • Patent number: 5631524
    Abstract: A switching apparatus obtains a large switching current by multiplying the number of electrons emitted by field emission from a cold cathode. The switching apparatus is driven by an optical wave and includes a recess portion of an insulation layer formed on a silicon substrate, a cold cathode formed on the insulation layer comprising many comb-tooth like tips extending from one side above the recess portion, a gate electrode disposed on the recess portion on the side of the cold cathode, an anode formed on the insulation layer and extending from another side opposed facing to the one side above the recess portion, an optically transparent sealing member comprising a recess portion on its under surface for enclosing a dilute nitrogen gas in a vacuum space, and a semiconductor laser, supported on the sealing member by a support member, for irradiating a laser beam through the sealing member into the space.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: May 20, 1997
    Assignee: Fuji Electric Co. Ltd.
    Inventors: Kazuo Matsuzaki, Arika Amano
  • Patent number: 5616865
    Abstract: Apparatus for non-destructively inspecting for faults in or beneath the surface of structures, such as debonds or delaminations in composite materials, or cracks, broken stringers, delaminations and the like in semi-monocoque structures, includes at least one spark gap discharge device displaced from the test object which focuses an acoustic pulse onto a small local area of the object for vibrationally exciting the surface of that area. A laser Doppler camera system, also displaced from the test object directs a laser beam onto the excited area and derives from light energy reflected back from the excited area the velocity of out-of-surface displacement of, and relaxation frequencies generated by, the surface of the excited area and provides an indication of whether a fault is present in that area.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: April 1, 1997
    Assignee: Holographics Inc.
    Inventor: John M. Webster
  • Patent number: 5473220
    Abstract: A discharge tube according to the present invention is constructed such that it comprises a cylindrical container made of an insulation tube, a pair of discharge electrodes provided at opposite ends of the cylindrical container, a plurality of insulation coated lines containing a gas-ionization accelerator therein, which insulation coated lines being provided on the inner surface of the cylindrical container covering the regions surrounding a cathode and a discharge space therein in a substantially parallel relation with a center axis of the cylindrical container, wherein the gas-ionization accelerator is made of a silicate powder selected from the group of alkaline metal, alkaline earth metal and so on, or of electrically conductive finely divided particles selected from the group of carbon, metal, metal oxide and so on.
    Type: Grant
    Filed: April 5, 1995
    Date of Patent: December 5, 1995
    Assignee: Yazaki Corp.
    Inventors: Takashi Sato, Takahisa Suzuki, Tetsuya Mitani, Hiromitsu Tsuchiya
  • Patent number: 5466989
    Abstract: A discharge tube according to the present invention is constructed such that it includes a cylindrical container made of an insulation tube, a pair of discharge electrodes provided at opposite ends of the container, a plurality of insulation coated lines containing a gas-ionization accelerator therein, which insulation coated lines being provided in the grooves formed on the inner surface of the container covering the regions surrounding a cathode and a discharge space therein in a substantially same distance from a center axis of the container, wherein the container further comprises a flange portion formed at the cathode-side thereof in such a way that it protrudes inwardly, and the insulation coated lines are provided on the inner surface of the container except the inner side of the flange portion.
    Type: Grant
    Filed: January 19, 1994
    Date of Patent: November 14, 1995
    Assignee: Yazaki Corporation
    Inventors: Takashi Sato, Takahisa Suzuki, Hiromitsu Tsuchiya, Tetsuya Mitani
  • Patent number: 5436528
    Abstract: A plasma source for generating a plasma in a chamber in conjunction with a radio frequency generator is described. The plasma source comprises a coil spiral, at least one insulator and at least one capacitor. The coil spiral conducts the radio frequency wave from the radio frequency generator and induces a plasma in the chamber. It comprises at least two segments. Each insulator and capacitor couple two adjacent segments of the coil spiral together.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: July 25, 1995
    Assignee: Texas Instruments Incorporated
    Inventor: Ajit P. Paranjpe
  • Patent number: 5272414
    Abstract: A discharge element comprises a linear electrode and a sheet electrode both of which are provided opposite to each other with an insulator sheet therebetween, in which the linear electrode is formed by plasma spray coating a high-meting point semiconductor so as not to be worn when a high-frequency high voltage is applied between both electrodes.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: December 21, 1993
    Assignee: I.T.M. Corporation
    Inventor: Masao Iwanaga
  • Patent number: 5235247
    Abstract: The discharge tube consists of an electrically insulating cylindrical body and a pair of electrodes disposed facing each other in the cylindrical body, and is sealed with an inert gas. An activation layer of a silicate compound of alkaline metal is formed over at least a part of the inner wall surface and the electrode surface, other than the discharge surface, that are exposed to the sealed gas. This activation layer helps keep the discharge inception voltage stable even when the discharge frequency changes greatly, which in turn extends the longevity of the discharge tube.
    Type: Grant
    Filed: September 12, 1991
    Date of Patent: August 10, 1993
    Assignee: Yazaki Corporation
    Inventors: Masataka Shishido, Takashi Sato, Takahisa Suzuki, Tetsuya Mitani, Hiromitsu Tsuchiya
  • Patent number: 5012383
    Abstract: An excellent lightning arrestor insulator is provided having a discharge gap portion and an arrestor ZnO element device both built in a body of the insulator, comprising projected discharge electrodes arranged in the inside of the insulator body, the discharge gap portion being formed of a heat resistant protrusion arranged in the inside of the insulator body and surrounding the discharge electrodes, and a pair of metal plates and/or electrically conductive ceramic plates sandwiching the protrusion from both sides thereof and electrically connected to the discharge electrodes, the pair of plates being joined and airtightly sealed to the protrusion via an inorganic glass. The arrestor ZnO element device has a highly reliable airtight fixing and sealing structure so that accidents in a power supply or distribution line at a normal working voltage can be substantially eliminated, and damages caused by hygromeration and lightnings can be noticeably decreased.
    Type: Grant
    Filed: July 27, 1990
    Date of Patent: April 30, 1991
    Assignee: NGK Insulators, Ltd.
    Inventors: Shoji Seike, Toshiyuki Mima, Masayuki Nozaki
  • Patent number: 5007850
    Abstract: In a cathode ray tube socket which is provided with a socket body having a plurality of contacts disposed in a circle and a high voltage discharge gap housing provided on one side of the socket body, there are provided along the inside surface of both a case forming the high voltage discharge gap housing and a cover to be put on the case on the side of its open end face a plurality of plate-shaped ribs extending in a direction across a high voltage discharge in the high voltage discharge gap housing. The ribs of the case and the cover are disposed at predetermined intervals so that they do not overlap each other. A meandering ridge is formed along one of the opposed side walls of the case and cover to define a gap therebetween.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: April 16, 1991
    Assignee: Hosiden Electronics Co., Ltd.
    Inventors: Hirofumi Inaba, Yasunori Nishikawa
  • Patent number: 4975624
    Abstract: A spark gap device is disclosed that is particularly suited for a rapid restrike or starting circuit which is employed in sport stadium lighting applications to start or restrike metal halide lamps that have been subjected to a momentary loss of power. The spark gap device comprises two electrodes that are arranged in a parallel side-by-side relationship and spaced apart from each other by a predetermined amount. The spark gap device operates that when a high voltage potential is applied across the electrodes, the generated and reoccuring spark is distributed along the parallel arranged electrodes. The parallel arrangement of electrodes provides for improved life and cooler electrode temperatures as compared to prior art spark gap devices in which the generated and reoccuring spark jumps between the end regions of separated electrodes.
    Type: Grant
    Filed: June 15, 1988
    Date of Patent: December 4, 1990
    Assignee: General Electric Company
    Inventors: Trasimond A. Soileau, Lawrence W. Speaker
  • Patent number: 4944004
    Abstract: An interface circuit provides for coupling of communications signals between a conductor of a transmission path, and a key telephone system and provides for protection against electrical energies, as may be associated with transient electrical event occurrences along the transmission path. The interface circuit provides for coupling of some of these transient electrical energies from the transmission path conductor to an earth ground. The interface circuit includes a plurality of electrical components and a plurality of electrical conductors being fixed to either of first and second surfaces of a sheet of electrically insulating material. The electrical conductors are spaced apart from each other by at least a predetermined amount. Some of the electrical conductors connect the electrical components of the interface circuit in a workable arrangement whereby the communications signals may be coupled.
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: July 24, 1990
    Assignee: Northern Telecom Limited
    Inventors: Robert S. Morley, Edward C. Carew
  • Patent number: 4935657
    Abstract: The present invention provides a Marx generator comprising:a sealed case inside which prevails an atmosphere of a dielectric gas,a plurality of capacitor stages connected by a plurality of electrodes to two annular terminals connected to pairs of associated spark-gap heads. The spark-gap heads of each of said pairs of associated spark-gap heads are mounted on the same insulating support so as to be connected mechanically together.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: June 19, 1990
    Assignee: Aerospatiale Societe Nationale Industrielle
    Inventors: Andre Lherm, Bernard Raveu
  • Patent number: 4931684
    Abstract: A device is provided for detecting defects in wire or cable insulation which is located in a vacuum without disconnecting the cable by synchronously detecting the current in a sense conductor with respect to the potential waveform existing or imposed on the cable under test. A sense conductor and a scanned extended electron source having a linear cathode array are both placed in close proximity to and along the cable under test. Only a small portion of the cathodes in the linear array are excited at any one time and by placing the proper signals on the excitation conductors of the electron source, the electron generation scans or propagates along the entire length of the extended electron source. The current flowing in the sense conductor due to the electrons from the electron source varies depending upon the presence of defects in the cable insulation.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: June 5, 1990
    Assignee: Westinghouse Electric Corp.
    Inventors: Juris A. Asars, Michael E. Colbaugh
  • Patent number: 4897577
    Abstract: A spark gap switch is disclosed. The spark gap switch comprises an anode and a cathode having facing surfaces separated by a predetermined gap, a trigger electrode located in the vicinity of such gap, and a piezoelectric generator connected between the trigger electrode and the cathode for triggering the spark gap switch.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: January 30, 1990
    Assignee: Noranda Inc.
    Inventor: Frank Kitzinger
  • Patent number: 4761794
    Abstract: A thyratron comprises an anode and control grids between which is located a double layer screen grid. Thermionic cathode material is inserted in an aperture in the part of the screen grid furthest from the anode, and in operation this is heated to the required temperature by hot plasma which surrounds it, thus eliminating the need for a cathode heater.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: August 2, 1988
    Assignee: English Electric Valve Company Limited
    Inventors: Hugh Menown, Arthur Maitland
  • Patent number: 4755719
    Abstract: A spark gap switch is disclosed with a pumping system which utilizes flowing gas to replenish the interelectrode region between conductive pulses. The spark gap switch typically consists of a housing enclosing a gas filled chamber in which there are two end electrodes with an intervening trigger plane electrode that may be inserted at other than midplane. To initiate switch closure, a trigger pulse is applied between one end electrode and a trigger plane electrode causing the gas in the intervening gap to ionize and conduct and thereby bring on complete switch closure. To achieve proper gas flow each end electrode is configured as a truncated cone and gas is caused to flow from a multiplicity of ports spaced equidistantly around each cone base. The gas ascends the conical outer surface of each end electrode, sweeps over the crown and exhausts out through an opening in the center of each electrode.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: July 5, 1988
    Assignee: Auco Research Laboratory, Inc.
    Inventor: Rudolf Limpaecher
  • Patent number: 4754199
    Abstract: A gas discharge apparatus includes a discharge chamber including a transparent dome portion and an electrode-including base portion, which together enclose an ionizable gas. A cup-shaped base member is affixed at its periphery to the edge of the base portion of the discharge chamber. A power supply and discharge excitation network is disposed within the interior of the base portion. The power supply and discharge network include a pair of terminals. An oscillator and associated step-up output transformer powered from the terminals is positioned between the terminals and the discharge chamber. A field shield including a conductive sheet member is positioned between the terminals and the discharge chamber. The field shield is adapted to be electrically coupled to the electrode so that discharge-supporting electric fields may be established in the discharge chamber between the electrode and through the dome portion of that chamber to an effective ground electrode exterior to the chamber.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: June 28, 1988
    Inventor: William P. Parker
  • Patent number: 4743804
    Abstract: An IREB is guided through a curved path by ionizing a channel in a gas with electrons from a filament, and confining the electrons to the center of the path with a magnetic field extending along the path. The magnetic field is preferably generated by a solenoid extending along the path.
    Type: Grant
    Filed: April 25, 1986
    Date of Patent: May 10, 1988
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Charles A. Frost, Brendon B. Godfrey, Paul D. Kiekel, Steven L. Shope
  • Patent number: 4727298
    Abstract: A triggerable opening switch for a very high voltage and current pulse includes a transmission line extending from a source to a load and having an intermediate switch section including a plasma for conducting electrons between transmission line conductors and a magnetic field for breaking the plasma conduction path and magnetically insulating the electrons when it is desired to open the switch.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: February 23, 1988
    Assignee: The United States of America as represented by the Department of Energy
    Inventor: Clifford W. Mendel
  • Patent number: 4712039
    Abstract: An integrated circuit including a plurality of active devices each including a thermionic cathode or a cold cathode, an anode, and a grid element, all coplanarly disposed on an insulating substrate in a vacuum. A plurality of electrostatic lens elements also are exposed on the substrate to produce electric fields that control the trajectories of electrons emitted by the cathodes to prevent the electrons from migrating to and charging up exposed portions of the substrate and the inner surface of the vacuum envelope and thereby preventing such charge buildup from altering the electrical characteristics of the active devices.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: December 8, 1987
    Inventor: Lazaro M. Hong
  • Patent number: 4672259
    Abstract: A power spark gap for protection of electrical equipment against overvoltages and having high current handling capacity is provided consisting of two carbon electrodes each of a hemispherical configuration disposed within a porcelain housing and with vent holes in the electrodes permitting arc transfer to an inner sleeve of durable conductive material.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: June 9, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Oral L. Riggins, Thomas L. Dyer, Jr.
  • Patent number: 4661709
    Abstract: The invention provides a modular-building block method and system of fabrication, installation, alignment and operation of a multi-beam assembly of miniaturized, all-electrostatic charged particle optical columns, such electron beam or ion beam optical columns mounted in parallel in a closely packed cluster over a small target surface area for parallel simultaneous charged particle beam writing on the target surface with the multiple-channel cluster of charged particle beam optical columns. The assembly provides a system and method of increased thru-put in the direct charged particle beam writing on semiconductor target wafers during fabrication of semiconductor micro-circuit chips.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: April 28, 1987
    Assignee: Control Data Corporation
    Inventors: David M. Walker, Alan P. Sliski, Kenneth J. Harte, John J. Carrona
  • Patent number: 4649315
    Abstract: Contact pieces are accommodated respectively in contact housings in a main body portion. Each of the contact pieces has an intermediate portion extending between a contact portion and a terminal portion and force-fitted and held as a first discharge electrode portion in first positioning grooves. An arcuate grounding conductor is disposed on the main body portion and has integral second discharge electrode portions and dust-prevention lug portions. The second discharge electrode portions are held in confronting and spaced relation to the first discharge electrode portions via discharge gap holes formed in a side wall portion of the main body and are force-fitted and held in second positioning grooves. The first and second discharge electrode portions define discharge gaps therebetween.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: March 10, 1987
    Assignee: Hosiden Electronics Co., Ltd.
    Inventors: Hirofumi Inaba, Yasumasa Watanabe
  • Patent number: 4631453
    Abstract: A triggerable ceramic gas tube voltage breakdown device, particularly adapted for use in an electrical circuit for controlling the light output of a photoflash lamp, includes means for reducing the attenuation of an electrical trigger pulse in the region of the electrode gap due to the ceramic spacer tube. The electric field intensity in the region of the electrode gap resulting from the trigger pulse may be enhanced by disposing annular conductive material in the region and by connecting that material to a source of the trigger pulses. Alternatively or in conjunction therewith, the configuration of the ceramic spacer tube may be altered by removing material from the ceramic spacer tube in the region of the electrode gap, thereby enhancing the electric field intensity in that region resulting from the trigger pulses.
    Type: Grant
    Filed: August 29, 1983
    Date of Patent: December 23, 1986
    Assignee: Joslyn Mfg. and Supply Co.
    Inventors: Alwyn A. DeSouza, Hans W. Oertel
  • Patent number: 4628399
    Abstract: A pair of main electrodes are hermetically mounted, by fusion of a low melting point metal, onto both end openings of an insulative cylindrical member, respectively. Main electric discharge surfaces of the electrodes oppose each other in said cylindrical member with a gap interposed therebetween. A recessed portion is provided in the main electric discharge surface of one of the pair of main electrodes. A pair of trigger electrodes are conductively connected to the pair of main electrodes, and oppose each other in the recessed portion to thereby form a trigger electric discharge gap therebetween. The pair of main electrodes are formed of electrically conductive material having a thermal coefficient of expansion greater than that of the insulative cylindrical member.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: December 9, 1986
    Assignee: Kabushiki Kaisha Sankosha
    Inventors: Daizo Shigemori, Yuji Muramatsu
  • Patent number: 4620126
    Abstract: A "Jacob's Ladder" type spark gap for use in a television receiver or the like includes an alumina substrate having a pair of divergent wires mounted thereon for extinguishing arcs thereacross. The bottom ends of the wires are formed into plug-in terminals. Both upper and lower portions of the wires are supported in suitable apertures in the substrate and soldered to silver pads formed thereon for rigidity purposes. A flameproof housing encloses the substrate and has air vents at the bottom and is open at the top.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: October 28, 1986
    Assignee: Zenith Electronics Corporation
    Inventor: Hans E. Manske
  • Patent number: 4616155
    Abstract: A bi-polar discharger for a coaxial conducting cable is formed by threading rod elements into the ends of a central passage through an internal electrode so as to be electrically conductive therewith. A casing around the internal electrode comprises a cylindrical outer electrode closed at each end by a bead of glass or ceramic which is fitted within an outer metal ring and the casing is sealed with a controlled atmosphere of an inert gas at low pressure by sealing of the outer rings to the cylindrical external electrode and sealing of the rod elements within the beads.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: October 7, 1986
    Assignee: Compagnie Industrielle de Tubes et Lampes Electriques CITEL
    Inventor: Francois Guichard
  • Patent number: 4604554
    Abstract: A triggered spark gap discharger having a small auxiliary gap in the trigger pulse path. The auxiliary gap provides ultraviolet radiation to liberate electrons at the trigger probe and allow prompt firing of the trigger gap and primary gap, particularly in aged discharger units.
    Type: Grant
    Filed: June 5, 1984
    Date of Patent: August 5, 1986
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Roy E. Wootton