Device Also A Ray Anode Or Cathode Patents (Class 315/5.33)
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Patent number: 7688132Abstract: An input circuit of a microwave amplification tube achieves improved instantaneous bandwidth. By directly coupling the transmission line carrying a modulating radio frequency signal to a control grid, a low-Q input circuit is created that increases the fractional bandwidth of the system. A resonant cavity may be used to generate a voltage across the gap between the cathode and the control grid. Alternative geometries are presented whereby the electron beam is emitted from a cathode connected either to the center conductor of the transmission line or to the outer conductor of the transmission line. Alternatively, the electric field of the radio-frequency signal propagating through the transmission line may be used to create a voltage across the gap between the cathode and the control grid without using a resonant cavity. Likewise, alternative geometries are presented by which the electron beam is emitted from a cathode connected either to the center conductor or to the outer conductor of the transmission line.Type: GrantFiled: November 28, 2007Date of Patent: March 30, 2010Assignee: L-3 Communications CorporationInventors: Mark Frederick Kirshner, Richard Donald Kowalczyk, Craig Bisset Wilsen
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Patent number: 7285915Abstract: An electron gun. The electron gun includes an RF cavity having a first side with an emitting surface and a second side with a transmitting and emitting section. The gun also includes a mechanism for producing an oscillating force which encompasses the emitting surface and the section so electrons are directed between the emitting surface and the section to contact the emitting surface and generate additional electrons and to contact the section to generate additional electrons or escape the cavity through the section. A method for producing electrons.Type: GrantFiled: November 26, 2001Date of Patent: October 23, 2007Inventors: Frederick Michael Mako, William Kalman Peter
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Publication number: 20040245933Abstract: Generating and frequency tuning of modulated high current electron beams and a specific efficient, high current, frequency-tunable device for generating intense radio frequency (RF), microwave electromagnetic fields in a standard rectangular waveguide. The invention utilizes current multiplication of a seed electron beam, comprising an energetic electron beam to impact a thin foil surface with high electric field. The transmissive-electron-multiplier foils also mitigate both space charge expansion and improve beam propagation effects, by shorting of the radially directed electric field at the axial location of the foil(s). Foil thinness and intensity of the exit fields provide for a multiplication process occurring in a fraction of an RF period. Both self-excited oscillator and amplifier configurations are envisaged. Also included is both a self-excited microwave generator and an amplifier, using a temporally modulated laser to generate a seed electron beam that is amplified.Type: ApplicationFiled: May 27, 2004Publication date: December 9, 2004Inventors: Donald E. Voss, Clifton C. Courtney
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Patent number: 6642657Abstract: An electron gun that generate an electron flow and the application of this gun to produce rf energy or for injectors. The electron gun includes an electrostatic cavity having a first stage with emitting faces and multiple stages with emitting sections. The gun also includes a mechanism for producing an electrostatic force which encompasses the emitting faces and the multiple emitting sections so electrons are directed from the emitting faces toward the emitting sections to contact the emitting sections and generate additional electrons and to further contact other emitting sections to generate additional electrons and so on then finally to escape the end of the cavity. A method for producing a flow of electrons.Type: GrantFiled: November 20, 2001Date of Patent: November 4, 2003Inventors: Frederick M. Mako, Amnon Fisher
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Patent number: 6633129Abstract: An electron gun that generates multiple electron bunches and the application of this gun to produce rf energy. The electron gun includes an rf input cavity having a first side with multiple emitting surfaces and a second side with multiple transmitting and emitting sections. The gun also includes a mechanism for producing a rotating and oscillating force which encompasses the multiple emitting surfaces and the multiple sections so electrons are directed between the multiple emitting surfaces and the multiple sections to contact the multiple emitting surfaces and generate additional electrons and to contact the multiple sections to generate additional electrons or escape the cavity through the multiple sections. A method for producing multiple electron bunches.Type: GrantFiled: November 21, 2001Date of Patent: October 14, 2003Inventor: Frederick M. Mako
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Patent number: 6583567Abstract: A method and device are provided for preventing deterioration of a cold cathode in an electron tube device that utilizes the cold cathode as an electron source. In accordance with the expression defining the beam current of the electron tube device, Ib<P&mgr;×Va3/2, where P&mgr; represents the perveance of an electron gun and Va represents a voltage impressed upon an accelerating electrode, the electric potential of the accelerating electrode or an adjacent electrode is maintained at the highest level of all electrodes in the electron tube at all times.Type: GrantFiled: March 15, 2001Date of Patent: June 24, 2003Assignee: NEC Microwave Tube, Ltd.Inventors: Shunji Tsuida, Hironori Imura, Hideo Makishima
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Publication number: 20020149316Abstract: The present invention pertains to an electron gun that generates multiple electron bunches and the application of this gun to produce rf energy. The electron gun comprises an rf input cavity having a first side with multiple emitting surfaces and a second side with multiple transmitting and emitting sections. The gun is also comprised of a mechanism for producing a rotating and oscillating force which encompasses the multiple emitting surfaces and the multiple sections so electrons are directed between the multiple emitting surfaces and the multiple sections to contact the multiple emitting surfaces and generate additional electrons and to contact the multiple sections to generate additional electrons or escape the cavity through the multiple sections. The multiple sections preferably isolates the cavity from external forces outside and adjacent the cavity. The multiple sections preferably include multiple transmitting and emitting grids.Type: ApplicationFiled: November 21, 2001Publication date: October 17, 2002Inventor: Frederick M. Mako
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Patent number: 6448703Abstract: An electron gun for a color cathode ray tube including a triode consisting of a cathode, a control electrode and a screen electrode, and first and second focus electrodes facing each other and installed sequentially from the triode, for forming quadrupole lenses for focusing and accelerating an electron beam emitted from the triode, wherein three first-elongated electron beam passing holes slanting in one direction at a predetermined angle with respect to the longitudinal axis are formed on the facing surface of the first focus electrode, and three second-elongated electron beam passing holes slanting in a direction opposite to that of the first-elongated electron beam passing holes at a predetermined angle with respect to the longitudinal axis are formed on the facing surface of the second focus electrode, and wherein a dynamic focus voltage synchronized with a deflection signal is applied to the first focus electrode and a focus voltage is applied to the second focus electrode.Type: GrantFiled: June 16, 1999Date of Patent: September 10, 2002Assignee: Samsung SDI Co., Ltd.Inventor: Hyoung-Wook Jang
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Publication number: 20020036470Abstract: Expressing a perveance of an electron gun to be determined by a form of the electron gun as P&mgr;, a voltage to be impressed on an accelerating electrode Va and a beam current Ib, voltage Va which satisfies the following expression,Type: ApplicationFiled: September 24, 2001Publication date: March 28, 2002Applicant: NEC CORPORATIONInventors: Shunji Tsuida, Hironori Imura, Hideo Makishima
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Patent number: 6344709Abstract: An electron gun with a simple structure, wherein electrodes are extracted along the axis of the gun. The electron gun comprises first stepped metal cylinder 201 which is joined with cathode 200, second metal cylinder 202 which is joined with first stepped metal cylinder 201, metal plate 221 which is joined with second metal cylinder 202, insulating cylinder 220 which is joined with metal plate 221, third metal cylinder 260 which is joined with the outer surface of insulating cylinder 220, fourth metal cylinder 210 which is joined with third metal cylinder 260, stepped insulating cylinder 250 which is joined with fourth stepped metal cylinder 210, fifth metal cylinder 270 which is joined with stepped insulating cylinder 250. Fifth metal cylinder 270 is grounded. Cathode lead wire and heater lead wire are extracted from insulating cylinder 220, while anode lead wire is connected with metal cylinder 260.Type: GrantFiled: July 21, 1999Date of Patent: February 5, 2002Assignee: NEC CorporationInventor: Tatsuya Uchikawa
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Patent number: 6310438Abstract: Expressing a perveance of an electron gun to be determined by a form of the electron gun as P&mgr;, a voltage to be impressed on an accelerating electrode Va and a beam current Ib, voltage Va which satisfies the following expression, Ib<P&mgr;×Va3/2 is impressed on the accelerating electrode. Further the electric potential of the accelerating electrode is maintained at the highest level of all electrodes in the electron tube at all times.Type: GrantFiled: August 12, 1998Date of Patent: October 30, 2001Assignee: NEC CorporationInventors: Shunji Tsuida, Hironori Imura, Hideo Makishima
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Patent number: 6304033Abstract: An electron beam tube (1) having an input resonator cavity (2) through which a high-frequency control voltage is applied between cathode (15) and grid (17) of the tube (1), while an annular electrode (8) connected in an electrically conducting manner to the grid (17) of the tube is arranged opposite a metal wall (9) of the input resonator cavity (2) and is connected to a DC power supply lead (11). Interference oscillations are suppressed in that a high-frequency damping material (14) is associated with the DC power supply lead (11) on a part of the length located proximate to the annular electrode.Type: GrantFiled: November 18, 1994Date of Patent: October 16, 2001Assignee: U.S. Philips CorporationInventors: Stefan Grote, Bernd Seidel
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Publication number: 20010024091Abstract: Expressing a perveance of an electron gun to be determined by a form of the electron gun as P&mgr;, a voltage to be impressed on an accelerating electrode Va and a beam current Ib, voltage Va which satisfies the following expression,Type: ApplicationFiled: March 15, 2001Publication date: September 27, 2001Inventors: Shunji Tsuida, Hironori Imura, Hideo Makishima
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Patent number: 6294868Abstract: A Wehnelt electrode and a cold cathode are pressed against and fixed to each other under spring force with a ceramic plate interposed therebetween. Metallized layers connected to a gate electrode and a focusing electrode are disposed on surfaces of the ceramic plate. The gate electrode and the focusing electrode are connected to external power supplies via the metallized layers as feeder path structures. With this arrangement, an electron gun for an electron tube with a cold cathode can be designed with increased degree of freedom, reduced in size, can easily be assembled at the time of manufacture, has high dimensional accuracy, provides high dielectric strength between gate and Wehnelt electrodes, and is highly resistant to vibrations.Type: GrantFiled: March 12, 1999Date of Patent: September 25, 2001Assignee: NEC CorporationInventors: Hironori Imura, Nobuya Seko