Including Cathode Assembly Patents (Class 313/446)
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Patent number: 6815913Abstract: The present invention provides a cathode ray tube which exhibits a favorable contrast by enhancing a speed modulation effect. A front-stage anode electrode and a focus electrode which constitute an electron gun are respectively divided into a plurality of portions. A plurality of portions of the divided front-stage anode electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. A plurality of portions of the divided focus electrode are arranged in the tube axis direction at given intervals and are electrically connected with each other. Due to gaps formed in the front-stage anode electrode and the focus electrode, the speed modulation effect is increased.Type: GrantFiled: July 12, 2002Date of Patent: November 9, 2004Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Syoichi Wakita, Nobuyuki Suzuki, Toshio Nakayama, Yasuo Tanaka, Kouichi Harasaka
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Publication number: 20040212289Abstract: Electron gun having cathode support means comprising:Type: ApplicationFiled: March 9, 2004Publication date: October 28, 2004Inventors: Arnaud Farizon, Philippe Zehnder, Christian Galmiche
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Publication number: 20040183423Abstract: The indirectly heated cathode structure includes a base metal having a thermal electron emitting material layer, a cylindrical sleeve holding the base metal at one end portion thereof and housing a heating heater in the inside thereof, an support having a large-diameter portion and g a small-diameter portion, and a cathode disc having a large-diameter portion at the leg-portion-side of the heating heater and having a small-diameter portion at the heater-main-portion side of the heating heater, wherein an outer surface of another end portion of the sleeve and an inner surface of the small-diameter portion of the support are fixed to each other, and an outer surface of the large-diameter portion of the support and an inner surface of the small-diameter portion of the cathode disc are fixed to each other.Type: ApplicationFiled: March 4, 2004Publication date: September 23, 2004Inventors: Yukio Suzuki, Sachio Koizumi, Toshifumi Komiya
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Publication number: 20040104662Abstract: The present invention achieves a screen of high luminance with an excellent focus characteristic.Type: ApplicationFiled: October 17, 2003Publication date: June 3, 2004Inventors: Hirofumi Nakamura, Hideki Miyazaki, Masatoki Morimoto, Kouji Shibusa, Toshinori Suzuki
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Patent number: 6744190Abstract: Cathode ray tube having an electron gun which is modified with respect to the electron gun having three equidistant cathodes lying “in line”. The cathode for generating the green (central) beam is offset with respect to its position in an in-line gun, and the grids in the focus and/or triode part of the gun have been modified to provide at least one kink in the trajectory of the green beam to restore convergence.Type: GrantFiled: December 20, 2001Date of Patent: June 1, 2004Assignee: Koninklijke Philips Electronics N.V.Inventors: Jozef Cornelis Walterus Van Vroonhoven, Johannes Theodorus Peerlings
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Patent number: 6741021Abstract: An electron gun includes a grid electrode having a thin plate portion in which an electron beam aperture is formed, wherein the thin plate portion is formed by using a die and punch die to bulge a portion of a metal plate in the plate thickness direction to such an extent as to correspond to the desired dimension of the thin plate portion to form a bulged portion and cutting the bulged portion. With this configuration, it is possible to eliminate a problem of the related art thin plate portion of a grid electrode for an electron gun formed by coining work, which is a rib is formed around the thin plate portion, to make the gap between the thin plate portion and a cathode narrower, since the diameter of the thin plate portion can be enlarged, and to provide beam apertures at arbitrary positions of the thin plate portion.Type: GrantFiled: December 26, 2000Date of Patent: May 25, 2004Assignee: Sony CorporationInventors: Yasunobu Amano, Masahiko Mizuki, Koichi Tahara, Noritaka Hamaya, Masamichi Senami
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Patent number: 6734609Abstract: The present invention relates to a cathode in a cathode ray tube which can shorten a picture presentation time lag and reduce power consumption. The cathode includes an emission layer at an upper part of the cathode and a sleeve for inserting a heater therein, wherein the sleeve contains a blackened material, and has a porous surface.Type: GrantFiled: April 19, 2002Date of Patent: May 11, 2004Assignee: LG Electronics Inc.Inventor: Byung Mook Weon
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Publication number: 20040080255Abstract: In an color CRT, an electron gun for the color CRT includes a triode unit for generating three electron beams and controlling and accelerating the generated electron beams; a main focusing lens unit that focuses the electron beams generated by the triode unit; a first electrostatic screen grid installed in the main focusing lens unit having three electron beam through holes linearly-arranged for passing the three electron beams and two of the holes are external holes, and the first grid having a first oval shaped hole that passes all three electron beams, the first oval shaped hole spaced a distance d1 from the through holes; and a second electrostatic screen grid installed in the main focusing lens unit having three electron beam through holes linearly-arranged for passing the three electron beams and two of the holes are external holes, and the second grid having a second oval shaped hole that passes all three electron beams, the second oval shaped hole spaced a distance d2 from the through holes; wherein tType: ApplicationFiled: October 6, 2003Publication date: April 29, 2004Inventors: Moon-Sik Kim, Hyun-Cheol Kim, Byung-Kyu Kang
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Publication number: 20040056578Abstract: This invention provides a multielectron gun which generates a plurality of electron beams having uniform characteristics. A multielectron gun (2) is formed of a plurality of electron guns (2a-2c). The electron gun (2a) has, in addition to an electron source (21a), Wehnelt electrode (22a), and anode electrode (23), a shield electrode (24) between the Wehnelt electrode (22a) and anode electrode (23). The shield electrode reduces field interference among the electron guns.Type: ApplicationFiled: July 14, 2003Publication date: March 25, 2004Applicant: CANON KABUSHIKI KAISHAInventors: Masahiko Okunuki, Hiroya Ohta, Norio Saito, Masaki Takakuwa, Sayaka Tanimoto, Takeshi Haraguchi
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Patent number: 6710534Abstract: An electron field emission device is provided by placing a substrate in a reactor, heating the substrate and supplying a mixture of hydrogen and a carbon-containing gas at a concentration of about 8 to 13 percent to the reactor while supplying energy to the mixture of gases near the substrate for a time to grow a first layer of carbon-based material to a thickness greater than about 0.5 micrometers, subsequently reducing the concentration of the carbon-containing gas and continuing to grow a second layer of carbon-based material, the second layer being much thicker than the first layer. The substrate is subsequently removed from the first layer and an electrode is applied to the second layer. The surface of the substrate may be patterned before growth of the first layer to produce a patterned surface on the field emission device. The device is free-standing and can be used as a cold cathode in a variety of electronic devices such as cathode ray tubes, amplifiers and traveling wave tubes.Type: GrantFiled: January 29, 2001Date of Patent: March 23, 2004Assignee: Extreme Devices, Inc.Inventors: Donald E. Patterson, Keith D. Jamison
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Patent number: 6703777Abstract: In an adjusting method for a cathode position of an electron gun, an apex point of a dome-shaped cathode is detected and then a positional adjustment is executed by moving a first grid in a X-Y direction so that a center of a grid aperture is coincided with the position of the apex point, at first. Next, a sleeve ring and a collar portion of a sleeve holder are welded together by a laser beam. The a dgk-vale adjustment is done so as for a gap between first grid and apex point of the cathode to be a predetermined value and welded by irradiating the laser beam to a superposed position of the cathode structure and the sleeve. According to the present invention, these positioning adjustment and the dgk-value adjustment are able to be executed independently.Type: GrantFiled: December 21, 2001Date of Patent: March 9, 2004Assignee: Sony CorporationInventors: Hirofumi Nakamura, Hideki Miyazaki, Yoshio Fuwa, Hiroshi Ushida
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Patent number: 6703776Abstract: A cathode ray tube comprising an electron source and an electron beam guidance cavity having an input aperture and an output aperture, wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an insulating material having a secondary emission coefficient &dgr;1 for cooperation with the cathode. Furthermore, the cathode ray tube comprises a first electrode which is connectable to a first power supply for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. &dgr;1 and E1 have values which allow electron transport through the electron beam guidance cavity. The cathode ray tube further comprises a conventional main lens to obtain a spot on a display screen. According to the invention, an electron lens is placed between the exit of the cavity and the main lens for directing the electron beam at a predetermined angle towards the entrance of the main lens.Type: GrantFiled: September 28, 2000Date of Patent: March 9, 2004Assignee: Koninklijke Philips Electronics N.V.Inventors: Nijs Cornelis Van Der Vaart, Gerardus Gegorius Petrus Van Gorkom, Petrus Hubertus Franciscus Trompenaars
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Patent number: 6680564Abstract: A field emission type cold cathode structure and an electron gun using the cathode are provided. The electron gun is capable of preventing electron emission error due to impurities etc. The electron gun includes a fusible metal layer formed between a base electrode and each emitter chip, a focus electrode formed on the upper portion of a gate electrode with an insulating layer therebetween, and a control electrode formed on the upper portion of a focus electrode with an insulating layer therebetween. The electron gun so constructed can reduce power for heating the cathode, display data and a picture instantly on a screen, simplify a structure of an electron lens etc. focusing an electron beam, and improving precision in electron gun assembly.Type: GrantFiled: March 21, 2001Date of Patent: January 20, 2004Assignee: LG Electronics Inc.Inventor: Kaoru Tomii
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Patent number: 6653771Abstract: The electron beam generating section in an electron gun assembly includes a cathode having an electron emitting surface. The surface of the cathode is divided into at least three regions of first, second and third regions which have different electron emission capabilities. The first region is arranged in the center of the surface of the cathode. The second region has its portions arranged on opposite sides of the first region in the horizontal direction. The third region has its portions arranged on opposite sides of the first region in the vertical direction.Type: GrantFiled: August 22, 2001Date of Patent: November 25, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Tomonari Ishihara, Kazunori Satou, Hirofumi Ueno
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Publication number: 20030214218Abstract: The CRT device comprises a cold cathode electron gun that includes cathodes, a peripheral focusing electrode, and an accelerating electrode. The cathode has a structure in which an emitter electrode and a gate electrode are joined together with an insulating layer interposed therebetween. The electric potential difference from the emitter electrode is 60V for the gate electrode, 0V for the peripheral focusing electrode, and 4.6 kV for the accelerating electrode.Type: ApplicationFiled: April 25, 2003Publication date: November 20, 2003Inventors: Takashi Itoh, Masahide Yamauchi, Koji Fujii
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Patent number: 6628061Abstract: An electron gun for a cathode ray tube includes a triode having cathodes, a first grid and a second grid, one or more third grids through which electron beams emitted from the cathode pass, a fourth grid opposing the third grids and forming a main focus lens with the third grid, a shield cup connected to the fourth grid and supplying a high voltage to the fourth grid, and a correction grid disposed between the fourth grid and the shield cup and having R, G, and B beam through holes arranged along a line. The R and B beam through holes have openings with asymmetrical shapes that are symmetrical with respect to each other and relative to the straight line, balancing astigmatisms and improving resolution.Type: GrantFiled: November 19, 2001Date of Patent: September 30, 2003Assignee: Samsung SDI Co., Ltd.Inventors: Young-gon Hong, Min-cheol Bae, Woo-seok Huh
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Patent number: 6614158Abstract: An electron gun arrangement includes a cathode having a front surface and control grid located in front of it. The control grid is mounted via a cylindrical support on a Kovar mount. The cathode is supported by a cylindrical support mounted on a Kovar support. Ceramic material being located between the two supports. The vacuum envelope within which the electron gun is contained includes the Kovar support and a flexible member with which it makes a vacuum seal, this member being of copper. The copper member is sealed to a ceramic cylinder via metal flanges. The assembly permits the spacing between the cathode and grid to be maintained while the copper member permits thermal expansion to occur to maintain vacuum integrity.Type: GrantFiled: May 7, 1999Date of Patent: September 2, 2003Assignee: EEV LimitedInventors: Alfred Christopher Thwaites, David Ward Carr, Steven Bardell, Peter Robert John Cox
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Patent number: 6586868Abstract: An electron gun structure applied to a color cathode-ray tube comprises a focus electrode, an ultimate acceleration electrode and at least one intermediate electrode disposed between the focus electrode and the ultimate acceleration electrode, the focus electrode, the ultimate acceleration electrode and the at least one intermediate electrode forming a main lens. The electron gun structure also comprises a voltage application unit for applying to the focus electrode a dynamic voltage increasing in accordance with an increase in a degree of deflection of the electron beams, and applying to the intermediate electrode a voltage obtained by dividing a voltage applied to the ultimate acceleration electrode by means of a voltage dividing resistor.Type: GrantFiled: June 16, 2000Date of Patent: July 1, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Tsutomu Takekawa, Hirofumi Ueno, Kazunori Satou
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Patent number: 6577054Abstract: An electron gun for cathode ray tubes (CRTs) with a helical multi-lens electrode assembly which is formed by coupling auxiliary electrodes to both ends of a helical resistive coil. The auxiliary electrodes have claws to be embedded in bead glasses, so that the helical resistive coil is mechanically supported in the electron gun. As a voltage is applied to the helical resistive coil through the auxiliary electrodes, multiple electron lenses are created due to voltage drops in each pitch of the helical resistive coil.Type: GrantFiled: July 14, 2000Date of Patent: June 10, 2003Assignee: Samsung SDI Co., Ltd.Inventors: Sang-mook Kim, Sang-kyun Kim, Duk-sung Park, Bong-wook Jung, Yeong-guon Won
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Publication number: 20030094888Abstract: A cathode assembly includes an insulation member, three holders arranged inline in the insulation member, and a support member having a rim portion in which the insulation member is inserted and supported. When a thickness of the insulation member is D millimeters (mm) and a height of the support member is F millimeters (mm), values of D and F are set to satisfy the following inequality: F/D<170%.Type: ApplicationFiled: October 7, 2002Publication date: May 22, 2003Inventor: Byoung-Kon Roh
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Patent number: 6566801Abstract: A cathode ray tube comprising an electron source and an electron beam guidance cavity having an input aperture and an output aperture, wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an insulating material having a secondary emission coefficient &dgr;1 for cooperation with the cathode. Furthermore, the cathode ray tube comprises a first electrode connectable to a first voltage source for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. &dgr;1 and E1 have values which enable electron transport through the electron beam guidance cavity. A second electrode is placed between the cathode and the cavity. The second electrode is connected to a second voltage source for applying, in operation, an electric field with a second field strength E2 between the cathode and the second electrode for controlling the emission of electrons.Type: GrantFiled: June 21, 2000Date of Patent: May 20, 2003Assignee: Koninklijke Philips Electronics N. V.Inventors: Nijs C. Van Der Vaart, Petrus H. F. Trompenaars, Eduard M. J. Niessen, Gerardus G. P. Van Gorkom
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Patent number: 6552485Abstract: An electron tube provided with a semiconductor cathode for emitting electrons, which semiconductor cathode is arranged on a support, a source being arranged in the vicinity of the cathode, in particular, so as to face the free (Si) surface of the cathode, which source is capable of evolving, at the increased temperatures occurring during evacuation of the tube in the manufacturing process, a reducing agent such as F2 or HF, which passivates the free (Si) surface of the cathode.Type: GrantFiled: June 22, 1999Date of Patent: April 22, 2003Assignee: Koninklijke Philips Electronics N.V.Inventors: Frederik C. Gehring, Ron Kroon, Tom Van Zutphen
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Patent number: 6545403Abstract: A color cathode ray tube having an improved electron gun, includes a quadrupole lens consisting of an independent static electrode having a static voltage applied thereto and a dynamic electrode which is disposed opposite to the independent electrode and having a dynamic voltage applied thereto. A dynamic strong quadrupole lens effect is obtained by applying a modulation voltage or parabola voltage to the dynamic electrode. When electron-beam-passing-apertures in electrodes of a main lens are enlarged, each axial distance between the axes of three electron-beam-passing-apertures of the static electrode opposite to the dynamic electrode in the strong quadrupole lens forming electrodes is offset and the sizes of the opposite side electron-beam-passing-apertures are increased by the offset axial distance.Type: GrantFiled: July 23, 1999Date of Patent: April 8, 2003Assignee: Orion Electric Co., Ltd.Inventor: Joo Il Lee
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Publication number: 20030048066Abstract: A cathode system includes an impregnated pellet and a conductive cup, which has substantially cylindrical sides. The conductive cup has an open end sized to receive the impregnated pellet and a closed end. The closed end has an internal surface and an external surface. The cathode system also includes a second conductive cup. The second conductive cup also has substantially cylindrical sides, an open end and a closed end. The cathode system further includes a similar third conductive cup. The three conductive cups are electrically coupled together. For construction of the cathode, the first conductive cup receives the impregnated pellet following coupling of the three conductive cups.Type: ApplicationFiled: September 7, 2001Publication date: March 13, 2003Inventors: Robert T. Longo, Elmer E. Reed, David W. Precht
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Patent number: 6531813Abstract: A color cathode ray tube having at least an evacuated envelope comprising a panel portion having a phosphor screen formed on an inner surface thereof, a neck portion, and a funnel portion connecting the panel portion and the neck portion. A shadow mask is spaced from the phosphor screen and suspended within the panel portion, an in-line type electron gun is housed in the neck portion and include three cathodes, a first grid electrode spaced from the three cathodes and a plurality of electrodes spaced between the first grid electrode and the shadow mask for generating and directing three electron beams toward the phosphor screen. A deflection yoke is mounted in the vicinity of the junction between the neck portion and the funnel portion.Type: GrantFiled: March 13, 2000Date of Patent: March 11, 2003Assignee: Hitachi, Ltd.Inventors: Sachio Koizumi, Toshifumi Komiya
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Publication number: 20030011294Abstract: A cathode ray tube has an electron beam generating section including an indirectly heated cathode structure and first and second electrodes arranged in the order named. The cathode structure is composed of a cathode sleeve for housing a heater therein, a cathode base metal disposed at an end of the cathode sleeve facing toward the first electrode, and an electron emissive oxide layer disposed on the cathode base metal. The electron emissive oxide layer is formed with a depression on a surface thereof facing the electron beam transmissive aperture in the first electrode. A maximum diameter of the depression is smaller than a maximum diameter of the electron beam transmissive aperture in the first electrode, and a maximum depth of the depression is smaller than the maximum diameter of the depression.Type: ApplicationFiled: July 8, 2002Publication date: January 16, 2003Inventors: Toshifumi Komiya, Sachio Koizumi
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Publication number: 20030006689Abstract: A cathode, a control electrode, and an accelerating electrode are formed in this order, and electron beam passing holes for passing an electron beam emitted from the cathode are provided in the control electrode and the accelerating electrode, respectively. A concave portion is formed on a surface of the control electrode on a side of the accelerating electrode, and a convex portion is formed on a surface of the accelerating electrode on a side of the control electrode. This allows an actual gap between the control electrode and the accelerating electrode on a periphery of the electron beam passing holes to be reduced, and thus a voltage to be applied to the accelerating electrode can be reduced. Further, while the voltage of the accelerating electrode is suppressed, the electron beam passing hole of the control electrode can be reduced in diameter, and thus a beam spot formed on a phosphor screen can be reduced in diameter.Type: ApplicationFiled: July 2, 2002Publication date: January 9, 2003Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Kazunori Ohta, Masahide Yamauchi
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Patent number: 6504293Abstract: A cathode ray tube is provided with a phosphor screen and an electron gun including a cathode having an electron-emissive material layer formed on a surface of a cathode base metal. The electron-emissive material layer includes a first layer made of an alkaline earth metal oxide on the surface of the cathode base metal, a second layer on a surface of the first layer which is an alkaline earth metal oxide layer containing at least one rare earth metal oxide in a range of 0.Type: GrantFiled: June 9, 2000Date of Patent: January 7, 2003Assignee: Hitachi, Ltd.Inventors: Sachio Koizumi, Toshifumi Komiya, Norio Iwamura
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Patent number: 6495952Abstract: A cathode ray tube includes an electron gun having plural focus electrodes and an anode in its neck portion, a voltage-dividing resistor for producing an intermediate voltage applied to a first one of the focus electrodes adjacent to the anode by dividing an anode voltage, a metal conductor attached to a second one of the focus electrodes to surround the voltage-dividing resistor, and a metal film on an insulating substrate of the voltage-dividing resistor between the metal conductor and an intermediate-voltage terminal of the voltage-dividing resistor. The second one of the focus electrodes is disposed upstream of the first one of the focus electrodes, and the metal film extends at least 1 mm axially and is spaced at least 1 mm from the metal conductor.Type: GrantFiled: February 29, 2000Date of Patent: December 17, 2002Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Hisao Nakamura, Satoru Miyamoto, Atsushi Tsuruoka
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Patent number: 6495953Abstract: To stabilize an emission current of cold cathode electron gun and extend its product life. A cold cathode electron gun comprises a cold cathode for emitting electrons by field-emission, a gate electrode for controlling the field-emission, a Wehnelt electrode which surrounds the cold cathode and the gate electrode, a first anode for accelerating electrons, and a second anode for constructing an electron lens together with the first anode. An inner diameter of the first anode is greater than a radius of flow of electrons which are emitted in the direction perpendicular to the optical axis of the electron lens.Type: GrantFiled: August 31, 1999Date of Patent: December 17, 2002Assignee: NEC CorporationInventor: Hironori Imura
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Patent number: 6492768Abstract: A cathode ray tube includes a phosphor screen and an electron gun. The electron gun includes an indirectly heated cathode structure and plural grid electrodes in axially spaced relationship. The cathode structure includes a base metal having an electron emissive material coating and a heater for heating the base metal. The heater includes a major heating portion having a spirally wound heating wire and leg portions disposed at ends of the major heating portion, and each of the leg portions includes a first multilayer winding portion having heating wires wound spirally in plural layers and a second multilayer winding portion disposed intermediate between the major heating portion and the first multilayer winding portion and having heating wires wound in plural layers.Type: GrantFiled: June 4, 1999Date of Patent: December 10, 2002Assignees: Hitachi, Ltd., Hitachi Electronic Devices Co., Ltd.Inventors: Sachio Koizumi, Norio Iwamura, Terutoshi Ichihara
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Patent number: 6476546Abstract: An electron gun for a color cathode ray tube includes a cathode, control electrode and a screen electrode forming a triode, and first and second focus electrodes forming an electron lens, wherein the thermal expansion coefficient of said screen electrode is less than the thermal expansion coefficient of said control electrode.Type: GrantFiled: January 24, 2000Date of Patent: November 5, 2002Assignee: Samsung SDI Co., Ltd.Inventor: Min-cheol Bae
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Patent number: 6472808Abstract: A color cathode ray tube includes third, fourth and fifth electrodes and an anode in its electron beam focusing section.Type: GrantFiled: December 21, 1999Date of Patent: October 29, 2002Assignee: Hitach, Ltd.Inventors: Go Uchida, Shoji Shirai, Shinichi Kato, Koichi Miyagawa
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Patent number: 6469433Abstract: Apparatus and method are provided for a package structure that enables mounting of a field-emitting cathode into an electron gun. A non-conducting substrate has the cathode attached and the cathode is electrically connected to a pin through the substrate. Other pins are electrically connected to electrodes integral with the cathode. Three cathodes may be mounted on a die flag region to form an electron gun suitable for color CRTs. Accurate alignment of an emitter array to the apertures in the electron gun and other electrodes such as a focusing lens is achieved. The single package design may be used for many gun sizes. Assembly and attachment of the emitter array to the electron gun during construction of the gun can lower cost of construction.Type: GrantFiled: January 28, 2000Date of Patent: October 22, 2002Assignee: Extreme Devices IncorporatedInventors: Randolph V. Schueller, Kent R. Kalar, Anthony A. Kloba
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Publication number: 20020084740Abstract: In an adjusting method for a cathode position of an electron gun, an apex point of a dome-shaped cathode is detected and then a positional adjustment is executed by moving a first grid in a X-Y direction so that a center of a grid aperture is coincided with the position of the apex point, at first. Next, a sleeve ring and a collar portion of a sleeve holder are welded together by a laser beam. The a dgk-vale adjustment is done so as for a gap between first grid and apex point of the cathode to be a predetermined value and welded by irradiating the laser beam to a superposed position of the cathode structure and the sleeve. According to the present invention, these positioning adjustment and the dgk-value adjustment are able to be executed independently.Type: ApplicationFiled: December 21, 2001Publication date: July 4, 2002Inventors: Hirofumi Nakamura, Hideki Miyazaki, Yoshio Fuwa, Hiroshi Ushida
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Publication number: 20020079823Abstract: An electron tube provided with a semiconductor cathode for emitting electrons, which semiconductor cathode is arranged on a support, a source being arranged in the vicinity of the cathode, in particular, so as to face the free (Si) surface of the cathode, which source is capable of evolving, at the increased temperatures occurring during evacuation of the tube in the manufacturing process, a reducing agent such as F2 or HF, which passivates the free (Si) surface of the cathode.Type: ApplicationFiled: June 22, 1999Publication date: June 27, 2002Inventors: FREDERIK C. GEHRING, RON KROON, TOM VAN ZUTPHEN
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Publication number: 20020053867Abstract: A cathode ray tube comprising an electron source and an electron beam guidance cavity having an input aperture and an output aperture, wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an isolating material having a secondary emission coefficient &dgr;1 for cooperation with the cathode and for forming an electron source. Furthermore, the cathode ray tube comprises a first electrode which is connectable to a first voltage source for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. &dgr;1 and E1 have values, which allow electron transport through the electron beam guidance cavity. According to the invention, the cathode structure comprises means for reducing the spread of the energy distribution of the electrons leaving the exit aperture between the input of the cavity and the accelerating grid.Type: ApplicationFiled: September 25, 2001Publication date: May 9, 2002Applicant: Koninklijke Philips Electronics N.V.Inventors: Nijs Van Der Vaart, Eduard Matheus Johannes Niessen, Martin Gerard Hendrik Hiddink, Gerardus Gegorius Petrus Van Gorkom, Bernardus Hendrikus Wihelmus Hendriks, Petrus Hubertus Franciscus Trompenaars, Willibrordus Adrianus Johannes Antonius Van Der Poel
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Patent number: 6373182Abstract: Apparatus and method for mounting a field emission device having emitters and an extraction grid in an electron gun are provided. The apparatus may be adapted from parts of a conventional electron gun that uses a thermionic emitter. Electrical connection to the grid is provided by bumps that are spring-loaded against a conducting surface, such as the second grid of a conventional electron gun.Type: GrantFiled: March 24, 2000Date of Patent: April 16, 2002Assignee: Extreme Devices, Inc.Inventors: Anthony A. Kloba, Randolph D. Schueller, David A. Delguzzi, Donald E. Patterson, Keith D. Jamison, Kent R. Kalar
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Patent number: 6369499Abstract: Cathode venting for electron guns is improved by forming one or more vent holes around the apertures in the triode and any pre-focus lens. This configuration places the vent holes next to the active area of the cathode and provides a line of sight from the cathode to the funnel. If separate alignment holes are used to protect the aperture, one or more vent holes are provided in addition to the alignment holes. The pattern of vent and alignment holes is preferably rotationally symmetric about the aperture so that they do not effect the beam.Type: GrantFiled: November 3, 1999Date of Patent: April 9, 2002Assignee: Intel CorporationInventor: Thomas A. Skupien
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Patent number: 6369494Abstract: The invention relates to a cathode structure intended to be inserted into an electron gun for a cathode-ray tube. The cathode comprises a cathode body on the end of which is placed an emissive pellet, the cathode body being held in place inside a sheath by supporting means which comprise: a first series of branches, each branch being connected on one side to the cathode body and on the other side to an intermediate piece 30; and a second series of branches, each branch being connected on one side to the sheath and on the other side to the same intermediate piece.Type: GrantFiled: October 4, 1999Date of Patent: April 9, 2002Assignee: Thomson Tubes & Displays, S.A.Inventors: Jean-Claude Pruvost, Jean Remy Adamski, Francois Fichet
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Publication number: 20020014827Abstract: An electron gun for a cathode ray tube. The electron gun has a plurality of cathodes, a plurality of grids arranged at one side of the cathode and having electron beam-passing holes through which electrons emitted from the cathode pass, and a shield cup connected with a final grid and having electron beam-passing holes. The cathode including a cylindrical sleeve, a base metal supported by the sleeve and having a concave surface applied with electron emitting materials with a uniform radius of a curvature from a central point in the electron beam-passing hole of a first grid which is in the closest vicinity of the cathode, wherein the central point is located flush with a surface of the first grid toward the cathode, and a heater installed in the inside of the sleeve for heating the base metal.Type: ApplicationFiled: July 26, 2001Publication date: February 7, 2002Inventor: Sung-Jun An
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Publication number: 20020011774Abstract: An electron field emission device is provided by placing a substrate in a reactor, heating the substrate and supplying a mixture of hydrogen and a carbon-containing gas at a concentration of about 8 to 13 per cent to the reactor while supplying energy to the mixture of gases near the substrate for a time to grow a first layer of carbon-based material to a thickness greater than about 0.5 micrometers, subsequently reducing the concentration of the carbon-containing gas and continuing to grow a second layer of carbon-based material, the second layer being much thicker than the first layer. The substrate is subsequently removed from the first layer and an electrode is applied to the second layer. The surface of the substrate may be patterned before growth of the first layer to produce a patterned surface on the field emission device. The device is free-standing and can be used as a cold cathode in a variety of electronic devices such as cathode ray tubes, amplifiers and traveling wave tubes.Type: ApplicationFiled: January 29, 2001Publication date: January 31, 2002Inventors: Donald E. Patterson, Keith D. Jamison
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Patent number: 6335590Abstract: A cathode ray tube include phosphor screen and an electron gun. The electron gun includes an indirectly heated cathode structure and plural grid electrodes arranged in axially spaced relationship. The cathode structure includes a base metal having an electron emissive material coating and a heater for heating the base metal. The heater includes a major heating portion having a spirally wound heating wire and a pair of leg portions connected to opposite ends of the major heating portion. The major heating portion and an inner portion of each of the leg portions on a major-heating-portion side thereof are covered with an insulating coating, and the heater is welded to electrical conductors for applying a voltage thereto at an outer portion of each of the leg portions, the outer portion not being covered with the insulating coating.Type: GrantFiled: January 9, 2001Date of Patent: January 1, 2002Assignee: Hitachi, Ltd.Inventors: Norio Iwamura, Sachio Koizumi
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Publication number: 20010043040Abstract: A cathode in an indirectly heated cathode ion source is supported by at least one rod or pin. The cathode is preferably in the form of a disk, and the support rod is smaller in diameter than the disk to limit thermal conduction and radiation. In one embodiment, the cathode is supported by a single rod at or near its center. The support rod may be held by a spring-action clamp for simple and reliable clamping and unclamping. The disk shaped cathode and the support rod may be fabricated as a single piece. A filament that emits electrons thermionically may be disposed around the rod in close proximity to the cathode.Type: ApplicationFiled: April 4, 2001Publication date: November 22, 2001Inventors: Joseph C. Olson, Leo Klos, Anthony Renau, Nicholas A. Venuto
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Publication number: 20010035709Abstract: A positioning system (20) for positioning a cone part of or for a CRT comprises a first and a second positioning means (22, 23) at positions corresponding to two corners of a side of a rectangle, and a third positioning means (21) at a position in the middle of the opposite side. The first and second means (22, 23) have a saddle-shaped contact surface, which is convex in the direction (51) from the tapered end to the wide end and concave (radius of curvature R) towards a central part of the rectangle, a contact surface of the third positioning means (21) is convex in the direction (51) from the tapered end to the wide end and convex or flat in a plane through the contact surfaces of the positioning means.Type: ApplicationFiled: April 10, 2001Publication date: November 1, 2001Inventor: Peter Antonius Johannes Jacobs
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Patent number: 6310434Abstract: A picture display device having a cathode which includes two electric current conductors between which a video signal is applied, for applying a video signal to the cathode to modulate an electron beam emitted from the cathode. To increase the feasible modulation frequency, the inductance of the two electric conductors is reduced by holding one part of the length of the conductors closer together than their spacing over another part of the same length.Type: GrantFiled: June 24, 1998Date of Patent: October 30, 2001Assignee: U.S. Philips CorporationInventors: Tom Van Zutphen, Jacobus Stoffels
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Patent number: 6304024Abstract: There is provided an impregnated-type cathode substrate comprising a large particle diameter low porosity region and a small particle diameter high porosity region which is provided in a side of an electron emission surface of the large particle diameter low porosity region and has an average particle diameter smaller than an average particle diameter of the large particle diameter low pore region and a porosity higher than a porosity of the large particle diameter low porosity region, the impregnated-type cathode being impregnated with an electron emission substance.Type: GrantFiled: December 17, 1999Date of Patent: October 16, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Eiichirou Uda, Toshiharu Higuchi, Osamu Nakamura, Kiyomi Koyama, Sadao Matsumoto, Yoshiaki Ouchi, Kazuo Kobayashi, Takashi Sudo, Katsuhisa Homma
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Publication number: 20010024082Abstract: The present invention relates to a field emission type cold cathode structure and an electron gun using the cathode which is capable of preventing electron emission error due to impurities etc. by emitting the electron with the field, the present invention comprises a fusible metal layer formed between a base electrode and each emitter chip, a focus electrode formed on the upper portion of a gate electrode with an insulating layer between them, and a control electrode formed on the upper portion of a focus electrode with an insulating layer between them, accordingly the present invention can reduce power for heating the cathode, display data and a picture instantly on a screen, simplify a structure of an electron lens etc. focusing an electron beam, and improving precision in electron gun assembly.Type: ApplicationFiled: March 21, 2001Publication date: September 27, 2001Applicant: LG Electronics Inc.Inventor: Kaoru Tomii
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Publication number: 20010015613Abstract: A cathode ray tube has a phosphor screen and an electron gun including an indirectly heated cathode structure and a plurality of electrodes disposed downstream of the indirectly heated cathode structure for projecting an electron beam toward the phosphor screen, and a deflection yoke for scanning the electron beam on the phosphor screen.Type: ApplicationFiled: January 10, 2001Publication date: August 23, 2001Inventors: Sachio Koizumi, Toshifumi Komiya, Norio Iwamura
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Patent number: 6275254Abstract: An auto-stereoscopic display device comprises a plane viewing screen, a plane cathode, and a plane permanent magnet. A two dimensional array of rows and columns of channels extends between opposite poles of the magnet for receiving electrons from the cathode. A phosphor layer is disposed between the screen and the magnet and having a plurality of pixels each corresponding to a different channel. Grid electrode means is disposed between the cathode and the magnet for selectively controlling flow of electrons from the cathode through each channel to the corresponding pixel in response to input video data. Deflection anode means is disposed on the side of the magnet remote from the cathode for sequentially deflecting, orthogonally to the columns, each electron beam to different parts of the corresponding pixel in response to an input video clock signal.Type: GrantFiled: January 2, 1997Date of Patent: August 14, 2001Assignee: International Business Machines CorporationInventors: John Beeteson, Andrew Knox