Insulating Spacer Between Discharge Electrodes Patents (Class 313/268)
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Patent number: 4873467Abstract: An ion source has the typical chamber wherein ions are produced and caused to be propelled outwardly through at least a pair of grids which have a mutually-aligned respective plurality of apertures. Thus, there are the usual cathode, anode, magnet assembly, ionizable gas inlet and supporting power supplies as well as neutralizing means. First and second grids each have an integrally-formed peripheral marginal portion. A support element has a shape which matches and overlies the marginal portion of one grid, while a clamp has a shape which matches that of and overlies the other marginal portion. The support element and clamp are secured together. First and second mutually-aligned seats are successively spaced around the respective marginal portions.Type: GrantFiled: May 23, 1988Date of Patent: October 10, 1989Inventors: Harold R. Kaufman, Raymond S. Robinson
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Patent number: 4801839Abstract: A cold cathode for generating an abnormal glow discharge electron beam within a vacuum chamber is mounted to a wall of the vacuum chamber such that only the emitting front face of the cold cathode, itself electrically insulated from the vacuum chamber wall by a narrow gap therebetween, is located inside the vacuum chamber, while the remainder of the cold cathode is located outside the vacuum chamber.Type: GrantFiled: December 8, 1986Date of Patent: January 31, 1989Assignee: Applied Electron CorporationInventors: George J. Collins, Jack D. Meyer, Zeng-qi Yu
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Patent number: 4798957Abstract: A cathode (32), a Wehnelt cylinder (2, 36) and an anode (3, 51) are accommodated in an integrated unit in an electron beam apparatus. Extremely accurate positioning of a Wehnelt bore and an anode bore with respect to one another can be achieved in such an assembled unit which is mounted in the apparatus so as to be removable as one unit. An exactly defined distance between the Wehnelt cylinder and the anode can also be adjusted. As a result of the exact mutual positioning, the anode bore can be chosen to be so small that it can also act as a beam aperture so that a smaller electron-optical object as well as a substantial reduction of the mutual electron interaction in the beam is achieved.Type: GrantFiled: December 7, 1987Date of Patent: January 17, 1989Assignee: U.S. Philips CorporationInventor: Harm Tolner
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Patent number: 4739222Abstract: A compact fluorescent lamp with a screw base having a lamp with an inner tube, an outer case which is provided at one end of the lamp and includes an operating circuit section therein and has a screw base at one end of the outer case, and a molding compound having excellent insulation and good conduction of heat which is pressed and interposed into the gap between the operating circuit section and the outer case in order to transfer the heat generated in the operating circuit section to the outer case.Type: GrantFiled: May 5, 1986Date of Patent: April 19, 1988Assignee: Hitachi, Ltd.Inventors: Ikuya Nomoto, Ichiro Torii, Kenji Kawabata
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Patent number: 4631453Abstract: 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: GrantFiled: August 29, 1983Date of Patent: December 23, 1986Assignee: Joslyn Mfg. and Supply Co.Inventors: Alwyn A. DeSouza, Hans W. Oertel
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Patent number: 4628421Abstract: A modular low voltage light strip includes an elongated, linear housing open along an upper portion thereof which is adapted to receive an elongated, linear circuit board. The circuit board includes a plurality of spaced apertures along its length and a plurality of conductive strips on a first lower surface thereof extending the length of the circuit board. A conductive mounting spring is positioned over each aperture on a second upper surface of the circuit board, is connected in circuit with one of the conductive strips, and is adapted to receive a threaded base or socket of a lamp in providing for the secure mounting thereof upon the circuit board and its electrical connection to a respective first conductive strip. With the lamp thus engaged by a respective mounting spring, its bottom terminal is positioned within an associated circuit board aperture and in contact with a second conductive strip.Type: GrantFiled: January 23, 1986Date of Patent: December 9, 1986Inventor: Lawrence E. Saar
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Patent number: 4620135Abstract: A thyratron utilizable as a circuit interrupting protective device is provided. The thyratron includes an apertured grid between anode and cathode which is divided transversely into two parts separated by an insulating layer. Both surfaces of the composite grid remote from the insulating layer carry conductive meshes which meshes cover the exits of the apertures in the composite grid. The thickness of the insulating layer and the dimensions of the meshes are such that no point within an aperture is further from a part of the grid or a mesh than the Debye distance whereby the effects of Debye shielding tend to be reduced when a negative potential is applied between two said parts of said grid to quench a discharge previously initiated by applying positive potential to both parts of the grid.Type: GrantFiled: October 25, 1983Date of Patent: October 28, 1986Assignee: English Electric Valve Company LimitedInventors: Timothy P. Donaldson, Raymond P. Knight, John R. Shepheard
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Patent number: 4396861Abstract: The invention contemplates lead-through structure for the high-voltage electrode of an electron microscope or the like, in conjunction with shaping of the high-voltage electrode and of the body of insulating material via which the lead-through is supported, in reference to metal envelope structure. The high-voltage electrode has a step-wise enlargement, and the surface of the insulating material which is exposed to the vacuum commences at the start of the step-wise enlargement. As a result, the field strength along the vacuum-exposed insulator surface is so influenced that a minimum electric field strength is produced at the boundary line between the vacuum and the high-voltage electrode. The further result is to prevent occurrence of microdischarges.Type: GrantFiled: September 5, 1980Date of Patent: August 2, 1983Assignee: Carl Zeiss-StiftungInventors: Dietrich Hoffmeister, Wilhelm Egle
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Patent number: 4340837Abstract: A low volume, lightweight, high voltage electron gun having an overall size and weight of approximately 50% the size and weight of a conventional electron gun of the same output. This is accomplished by interposing between the cathode and the walls of the housing of the electron gun a thin piece of dielectric material of preselected breakdown strength. The dielectric material is in direct contact with both the cathode and the housing of the electron gun, with the voltage stress between the walls of the housing and the cathode being such that it does not exceed the breakdown strength of the dielectric material.Type: GrantFiled: January 10, 1980Date of Patent: July 20, 1982Assignee: The United States of America as represented by the Secretary of the Air ForceInventor: Thomas W. Meyer
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Patent number: 4330734Abstract: The structure of an electrode for collimation lens in an image pickup tube has an improved joint for an accelerating electrode of an electron gun and a mesh electrode. The joint has an electrode support member integral with the fore end of the accelerating electrode and having a cylindrical center portion width not overlapped with the fore end, and a glass bead for connecting the width and the mesh electrode.Type: GrantFiled: February 4, 1980Date of Patent: May 18, 1982Assignee: Hitachi, Ltd.Inventors: Satoru Miyamoto, Takeo Yoshida
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Patent number: 4329617Abstract: A control plate for a flat plasma screen, comprising a carrier plate of multi-layer construction, having at least three layers, the middle layer of which is of metal and the outer layers of which are glass. In the manufacture of the control apertures which extend through the control plate, an etching procedure may be employed, involving a series of etching steps with different etching agents, whereby only slight underetchings arise and the control plate maintains sufficient mechanical stability, even with a medium overall thickness. The manufacture of the control apertures may also be effected by a laser-boring operation or the like, in which the metallic middle layer carries off heat developed during the operation, whereby no thermal fissure formations are created.Type: GrantFiled: October 5, 1979Date of Patent: May 11, 1982Assignee: Siemens AktiengesellschaftInventor: Burkhard Littwin
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Patent number: 4323813Abstract: The electron gun comprises an electron lens assembly including a pair of terminal electrodes fixedly mounted along a pair of glass support rods. Disposed between the terminal electrodes is a resistive lens stack of alternate apertured electrode plates and resistive spacer blocks. The electrode plates and resistive spacer blocks are urged into good electrical contact with each other and with the terminal electrodes by a plurality of leaf springs. The electrode plates are preferably lightly contacted by the glass support rods to prevent lateral movement of the plates without preventing their spring-urged contact with the resistive blocks.Type: GrantFiled: January 23, 1980Date of Patent: April 6, 1982Assignee: RCA CorporationInventors: Leon J. Vieland, Vincent M. Cannuli
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Patent number: 4322656Abstract: A spacer mount for a gas-discharge display device in which glass elements are arranged between a control hole plate and a fluorescent screen carrying image points of luminous material has a plurality of glass plates stacked one atop another between the control hole plate and the fluorescent screen. The glass layers include holes aligned with the holes of the control hole plate and the image points, and at least one metal layer is interposed between at least two of the glass plates and has holes aligned with the holes of the control hole plate.Type: GrantFiled: November 23, 1979Date of Patent: March 30, 1982Assignee: Siemens AktiengesellschaftInventors: Wilhelm Huber, Peter Mammach, Kaspar Weingand
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Patent number: 4254357Abstract: 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: GrantFiled: September 14, 1979Date of Patent: March 3, 1981Assignee: The United States of America as represented by the Secretary of the NavyInventors: George A. Haas, Richard E. Thomas, Richard F. Greene
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Patent number: 4250428Abstract: 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, BM, 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. 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.Type: GrantFiled: May 9, 1979Date of Patent: February 10, 1981Assignee: The United States of America as represented by the Secretary of the ArmyInventors: David W. Oliver, Casmir R. Trzaskos
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Patent number: 4223244Abstract: A fluorescent display device having pattern display sections each composed of phosphor-coated anodes arranged in the form of a matrix, at least a filament for emitting electrons when heated, the anodes being selectively bombarded with electrons emitted from the cathode to produce a visual display, position-selecting grids provided between the filament and the pattern display sections, column-selecting grids or row-selecting grids provided opposite to the columns or rows of the anodes, and a frame member provided, on its surface facing the filament, with the position-selecting grids and on its surface facing the pattern display section with the column-selecting grids or the row-selecting grids, the frame member being made of insulating material at least where necessary. With the provision of the frame member, the device of the present invention can be assembled easily, securely and correctly, and can produce a high-quality display.Type: GrantFiled: October 16, 1978Date of Patent: September 16, 1980Assignee: Futaba Denshi Kogyo K.K.Inventors: Takao Kishino, Kishio Kawasaki, Nobuo Yamaguchi
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Patent number: 4223243Abstract: 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: GrantFiled: May 9, 1979Date of Patent: September 16, 1980Assignee: The United States of America as represented by the Secretary of the ArmyInventors: David W. Oliver, Norman T. Lavoo
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Patent number: 4155026Abstract: A mesh electrode for a c.r.t. display device consists of a number of coplanar portions of mesh insulated from each other and secured to a support plate by means of a refractory compound incorporating particles larger than the pitch of the mesh. These particles space the mesh away from the support plate and allow the electrode to be easily fabricated.Type: GrantFiled: August 22, 1977Date of Patent: May 15, 1979Assignee: English Electric Valve Company LimitedInventor: Ralph D. Nixon
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Patent number: 4075527Abstract: An improved x-ray or other ionizing radiation detector comprises an array of adjacent cells comprised of alternately disposed oppositely polarized electrodes and guard electrodes and insulators between them. Means are provided for maintaining uniform and accurate dimensions between electrodes and the overall length of the array.Type: GrantFiled: September 27, 1976Date of Patent: February 21, 1978Assignee: General Electric CompanyInventor: Harold R. Cummings
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Patent number: 3956652Abstract: Device on a metallic gas discharge vessel as a current lead-in through its wall. The inner conductor which traverses the container wall is supported by an insulating sleeve. For protection against the action of glow discharges protective gaps are located in front of the insulating sleeve which are formed by an inner insulatedly supported metallic shielding sleeve. A second outer insulatedly arranged shielding sleeve encloses the inner shielding sleeve and forms protective gaps located in front of the inner shielding sleeve. The outer shielding sleeve shields the inner shielding sleeve against the electric field originating from the container wall.Type: GrantFiled: January 28, 1975Date of Patent: May 11, 1976Assignee: Elektrophysikalische Anstalt Bernard BerghausInventor: Horst Rordorf