Abstract: An electron gun supporting member includes an insulating supporting member configured such that its one end is connected to a predetermined member having a ground potential and other end is connected to a high-voltage electrode to which a high potential being a negative high potential for emitting electrons from an electron source is applied, so as to support the high-voltage electrode, and a metal film formed in a partial region, which contacts neither the high-voltage electrode nor the predetermined member, on the outer surface of the insulating supporting member.

Abstract: A mesh electrode adhesion structure includes: a substrate, and an opening defined in the substrate; a mesh electrode on the substrate, and a first combination groove defined in the mesh electrode; and an adhesion layer between the substrate and the mesh electrode. The mesh electrode includes: a mesh region corresponding to the opening defined in the substrate, and an adhesion region in which the first combination groove exposes the adhesion layer.

Abstract: A video conference system provides “in the room” telepresence to near end participants. The video conference system includes a frameless or bezelless display device placed in front of a front wall for displaying edge-to-edge 3D images of far end participants. Color of the near end front wall is configured to be the same as the color of the far end rear wall. As a result, images displayed on the display device can merge or blend into the near end front wall, giving the near end participants the perception that the far end participants are actually in the near end conference room. Brightness of the faces/bodies of the near end participants can also be adjusted to match the brightness of the face/bodies of the images of the far end participants as they appear on the display device—therefore enhancing the in the room perception of the far end participants.

Abstract: A high-definition CRT is provided having an electron gun to produce high beam current without increasing spot size and to provide lower electrical power requirements at high beam-modulation frequencies. The electron gun includes beam-forming electrodes and a lens. Each beam-forming electrode has several aperture clusters operable to form several collimated beams of electrons. In addition, the lens is operable to focus the several collimated beams of electrons onto a display screen.

Abstract: A conductive film isolated from an inner conductive film is formed on an inner wall of a neck. Assuming that, among a plurality of focusing electrodes constituting an electron gun, a position in a tube axis direction of an end on an anode side of an anode-side focusing electrode placed at a position closest to the anode side is P0; among electrodes supplied with substantially the same voltage as that of the anode-side focusing electrode and arranged continuously from the anode-side focusing electrode, a position in the tube axis direction of an end on a beam generating portion side of an electrode placed at a position closest to the beam generating portion side is P1; in the tube axis direction, a position of an end on the beam generating portion side of the conductive film is PL1 and a position of an end on the panel side of the conductive film is PL2, the position P0 is placed between the position PL1 and the position PL2.

Abstract: An electron gun assembly for a cathode ray tube includes a cathode for emitting an electron beam, and a plurality of electrodes mounted in a row with predetermined gaps therebetween. The electrodes include a focus electrode for receiving a focus voltage, and an anode electrode surrounding part of the focus electrode for receiving an anode voltage. A support is used to fix the electrodes in an aligned configuration, and a first auxiliary support secures the focus electrode to the support. The focus electrode includes an intermediate aperture section, a small aperture section, and a large aperture section, while the anode electrode includes a large aperture section and a small aperture section. Two second auxiliary supports secure the anode electrode to the support.

Abstract: An electron gun assembly that emits three electron beams, which are arranged in line, toward a phosphor screen includes three cathodes arranged in line, three first grids arranged to face the associated cathodes, and a second grid with an integral structure that is disposed to face a phosphor screen side of the first grids. Each of the first grids is formed of a cup-shaped electrode body having an electron beam passage hole. The electron gun assembly further includes an insulation member through which the three first grids penetrate, the insulation member thus integrally holding the three first grids, a cylindrical member that surrounds the insulation member and has an implant part, and an insulating support member that supports the implant part of the cylindrical member.

Abstract: An electron gun for a cathode ray tube includes a cathode for radiating electron beams, a scanning velocity modulation coil for synchronizing the electron beams with an image signal, a focus electrode having first and second sub-electrodes disposed with a gap through which a magnetic field generated by the scanning velocity modulation coil passes, a plurality of grid electrodes with the focus electrode for controlling the electron beams radiated from the cathode, a support for aligning and supporting the grid electrodes, and a shield electrode electrically connected to the first and second sub-electrodes to protect against infiltration of an outer electric field. The shield electrode includes plural intermediate electrodes disposed in the gap between the first and second sub-electrodes, and electrical connecting unit for electrically connecting the intermediate electrodes to the first and second sub-electrodes. The intermediate electrodes are spaced away from each other.

Abstract: A resistor for an electron gun assembly is configured to apply a voltage, which is divided with a predetermined resistance division ratio, to an electrode provided in the electron gun assembly. The resistor includes an insulating substrate, an electrode element provided in association with each of a plurality of terminal portions on the insulating substrate, a resistor element having a pattern for connecting the electrode elements and obtaining a predetermined resistance value, and an insulating coating layer that covers the resistor element. In at least one terminal portion B, the electrode element is disposed spaced apart from the insulating coating layer, and an intermediate resistor element is disposed between the electrode element and the insulating coating layer. The intermediate resistor element has a resistance value that is different from a resistance value of the electrode element.

Abstract: A cap can comprise an aperture, and an attenuator may block the aperture during at least one point in time. In one embodiment, the attenuator can include a cover that may be displaced by a spring. In another embodiment, such as an electron gun, may comprise a support cap with an aperture, a displaceable cover that may cover the aperture, and a spring. A material attached to the spring and acting as a fuse may release the spring and expose the aperture after an electrical current blows the “fuse”. In yet another embodiment, a method for using a tube may comprise evacuating the tube while a cover covers an aperture in the support cap of a electron gun that is at least partially in the tube and moving the cover to expose the aperture after the tube is sealed.

Abstract: 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%.

Abstract: The present invention provides an electron gun which includes an electrically non-conductive substrate through which a perforation is provided. The electron gun is characterized in that a cathode-structure supporting member is welded to power-feeding members that are bonded to a stem side of the electrically non-conductive substrate, the cathode-structure supporting member supplying power to a heater included in a cathode structure. Structured as such, it becomes possible to reduce the size of the electron gun in the tube-axis direction, since an additional member for supporting the heater becomes unnecessary. In addition, the cathode-structure supporting member makes the electrically non-conductive substrate to work as a wiring board for supplying voltage to the cathode, thereby realizing a slim cathode-ray tube. Further, the above structure improves accuracy in the assembly process of the electron gun, thereby improving the yield factor.

Abstract: Disclosed is a cathode ray tube with an electron gun capable of improving a resolution of an image by preventing electron beams from striking electrodes and efficiently controlling a spot size that is susceptible to a change in current capacity.

Abstract: Disclosed is an electron gun for a cathode ray tube capable of improving substantial resolution by improving the alignment of a triode portion. The electron gun includes a triode portion composed of at least one cathode for emitting electron beams, and a first electrode and a second electrode for controlling emission amount of the electron beams, a focus electrode and an anode electrode forming a prime lens for focusing the electron beams on a screen, and at least two guide holes housed in more than two electrodes for use of assembly besides electron beam passage holes, in which at least one guide hole is circular and at least one of the other guide holes is non-circular.

Abstract: 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.

Abstract: A cathode ray tube has a cathode and plural grid electrodes fixed by insulating support rods. The cathode is supported within an eyelet disposed within and bonded to a cup-shaped support by a crystallized glass. The cup-shaped support is fixed by the insulating support rods. The crystallized glass is formed by firing a glass composition composed chiefly of zinc oxide, boron oxide, silicon oxide, and magnesium oxide. The crystallized glass exhibits a ratio in intensity of a diffraction peak A to a diffraction peak B in a range from 0.25 to 0.80 in an X-ray diffraction analysis using X-rays of 0.154 nm in wavelength, where the diffraction peak A is in the vicinity of 2&thgr;=25.5°, the diffraction peak B is in the vicinity of 2&thgr;=26.5°, 2&thgr;is an angle which a diffracted X-ray beam from a specimen surface makes with an incident X-ray beam.

Abstract: In an electron gun for a color cathode ray tube apparatus of this invention, one intermediate electrode is arranged between a final acceleration electrode and a focus electrode that make up a main lens, and a voltage divided by a voltage dividing resistor for dividing a voltage to be applied to the final acceleration electrode is applied to the intermediate electrode. A dynamic voltage which increases along with an increase in deflection amount of an electron beam is applied to the focus electrode, and a dielectric portion is formed between the final acceleration electrode and the focus electrode. This dielectric portion is formed on the intermediate electrode. Hence, elliptical distortion of electron beam spots is decreased on the entire surface of a phosphor screen, thereby providing a color cathode ray tube apparatus with a good performance on the entire surface of the phosphor screen.

Abstract: A cathode ray tube comprising an electron gun. The electron gun has electrodes which are secured to supports by connecting elements. The width of the connecting elements varies. As a result, the high-voltage behavior of the cathode ray tube is improved.

Abstract: A cathode ray tube includes an electron gun directing electrons towards a faceplate having an electrode biased at screen potential. The electron beam is magnetically deflected to scan across the faceplate to impinge upon phosphors thereon to produce light depicting an image or information. A neck electrode near the tube neck is biased at or below screen potential and a second electrode between the neck electrode and the faceplate is biased at or above screen potential. As a result, the electrons are deflected over a greater total angle than is obtained from the magnetic deflection. A third electrode proximate the faceplate is biased at or below screen potential to direct electrons towards the faceplate, thereby to increase the landing angle of the electrons thereon. A metal and ceramic support includes a resistive voltage divider to which ones of the electrodes connect.

Abstract: In a color cathode ray tube, an electron gun assembly is received in a neck and includes three cathode electrodes, which are heated by heaters, respectively, and a plurality of electrodes. A sealing portion is welded to a stem section of the neck, and stem pins holding the electron gun are buried in the sealing portion. A wire is connected at one end to the stem pin and also connected at the other end to the electrode corresponding to the stem pin so as to electrically connect the electrode to the stem pin. The wire is provided with a folded portion. Even if the wire is thermally expanded, the thermal expansion is absorbed by the folded portion so as to suppress the fluctuation of the cathode current flowing into the electrode.

Abstract: A projection type cathode ray tube has a panel and an electron gun. The electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals. The second anode has a first cylindrical portion at the panel side and a second cylindrical portion at the cathode side, the first cylindrical portion having a larger inner dinner diameter than the inner diameter of the second cylindrical portion. The focus electrode has a panel side cylindrical portion with an inner diameter D1 and a length L1, an intermediate cylindrical portion with an inner diameter D3 and a length L3, and a cathode side cylindrical portion with an inner diameter D2 and a length L2. The inner diameters D1, D2, and D3 are different from each other.

Abstract: 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.

Abstract: A resistor for an electron gun assembly, for applying a resistor-divided voltage to an electrode provided in the electron gun assembly, comprises an insulative substrate, at least two first resistor elements disposed at predetermined positions on the insulative substrate, and a second resistor element having a predetermined pattern which electrically connects the first resistor elements. The resistor has a structure in which an effective length of the second resistor element between the first resistor elements varies in accordance with a position of the second resistor element relative to the first resistor elements.

Abstract: The present invention provides an electron gun which includes an electrically non-conductive substrate through which a perforation is provided. The electron gun is characterized in that a cathode-structure supporting member is welded to power-feeding members that are bonded to a stem side of the electrically non-conductive substrate, the cathode-structure supporting member supplying power to a heater included in a cathode structure. Structured as such, it becomes possible to reduce the size of the electron gun in the tube-axis direction, since an additional member for supporting the heater becomes unnecessary. In addition, the cathode-structure supporting member makes the electrically non-conductive substrate to work as a wiring board for supplying voltage to the cathode, thereby realizing a slim cathode-ray tube. Further, the above structure improves accuracy in the assembly process of the electron gun, thereby improving the yield factor.

Abstract: An electron gun for a cathode ray tube includes a cathode assembly, a control electrode, and a screen electrode adjacent to the cathode assembly, combined, and spaced apart from each other by a gap maintainer, focusing electrodes sequentially arranged adjacent to the screen electrode, forming an auxiliary lens and a main lens, and bead glass in which portions of the cathode assembly and respective electrodes are embedded and supported.

Abstract: A color cathode ray tube has an electron gun in its neck portion. The electron gun includes plural focus electrodes and an anode fixed in axially spaced relationship by two support rods. The electron gun also includes a voltage-dividing resistor for producing a voltage applied to a first focus electrode by dividing a voltage applied to the anode, and a metal conductor surrounding the resistor and fixed to a second focus electrode upstream of the first focus electrode. The resistor is disposed in the vicinity of one of the support rods, is formed of an insulating film, a resistance pattern, and a substrate disposed in the order named from the insulating film toward the neck portion. The resistance pattern is such that a potential difference between the metal conductor and a portion of the resistance pattern facing the metal conductor is equal to or smaller than 4 kV.

Abstract: A cathode ray tube has an electron gun supported on a stem of a vacuum envelope having stem pins. The electron gun includes electrodes fixed on two bead glasses, and mount supports are embedded in end portions of the bead glasses for supporting the electron gun on the stem, and a supporting member connects one of the stem pins and one of the mount supports. The supporting member includes a plate-like portion, first and second bent portions bent from respective sides of the plate-like portion to form a generally C-shaped transverse cross section, the first bent portion is welded to the one of the mount supports, and the second bent portion is welded to the one of the stem pins. An axial length of the plate-like portion on its first-bent-portion side is longer than that on its second-bent-portion side.

Abstract: 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.

Abstract: A cathode ray tube has a phosphor screen and an electron gun. The electron gun includes an electron beam generating section and an electron beam focusing section for focusing an electron beam from the electron beam generating section onto the phosphor screen. The electron beam generating section and the electron beam focusing section are mounted in predetermined spaced relationship on plural insulator support rods. The electron beam focusing section includes at least one compound electrode formed of a first electrode member, a second electrode member and a plate-like electrode member sandwiched therebetween. The plate-like electrode member is fabricated from a material thicker than materials from which the first and second electrode members are fabricated. The plate-like electrode member is laser-welded to the first and second electrode members at points of edges of the first and second electrode members.

Abstract: A color cathode ray tube includes an electron gun having cathode structures arrayed in line with a cup-shaped first grid electrode. Each of the cathode structures is fused and fixed to a cathode in an electrically insulated state by hermetic glass. A cathode support to which the cathode structures are fixed by glass is fixedly housed in the cup-shaped first grid electrode, and the first grid electrode and the cathode support are welded on an axis along which the cathode structures are arrayed. The cathode structures and the first grid electrode are welded on an inline axis so that the thermal deformation of the cathode support can be made uniform at the center portion and at side portions. Accordingly, at the start-up time of the color cathode ray tube, the cathode currents at the center portion and at the side portions can be equalized and a good color balance can be maintained on the screen.

Abstract: A cathode ray tube includes an electron gun having a cathode, first and second grid electrodes, plural focus electrodes and an anode electrode fixed by two glass beads; a voltage-dividing resistor attached to one glass bead for producing an intermediate voltage applied to a first one of the plural focus electrodes adjacent to the anode electrode by dividing an anode voltage and a metal conductor attached to one of electrodes of the electron gun disposed upstream of the first one of the plural focus electrodes to surround the voltage-dividing resistor and the glass bead. The voltage-dividing resistor includes an overcoat insulating film, a resistance element and an insulating substrate stacked in the order named from the overcoat insulating film facing the glass bead, and the resistance element includes first-type resistance-forming regions disposed on opposite sides of the metal conductor and a second-type resistance-forming region containing a portion thereof facing the metal conductor.

Abstract: An electron gun for emitting an electron beam to a phosphor screen and for scanning one of two scanning regions defined in the phosphor screen is arranged in two necks of a vacuum envelope. A mask body of a shadow mask has two effective areas, in which numerous electron beam passage apertures are bored, defined in association with the scanning regions, and has a boundary portion defined between the effective areas and opposed to the boundary between the scanning regions of the phosphor screen. An adjustment member used to adjust a q value at a plurality of points on the boundary portion is fixed to the inner surface of the boundary portion. After the q value is adjusted, the adjustment member is fixed to the mask frame.

Abstract: An electron gun for a cathode ray tube and a cathode ray tube using such electron gun is provided. The electron gun includes a cathode for emitting an electron beam; a plurality of grid electrodes aligned sequentially from the cathode, one of the grid electrodes including a plurality of focusing electrodes that are mounted with a predetermined gap therebetween; a support for fixing the grid electrodes in their aligned arrangement; and a shield electrode mounted covering the gap(s) of the focusing electrodes and extending a predetermined distance over the focusing electrodes. The cathode ray tube includes the electron gun; a neck, within which the electron gun is mounted; and a scanning velocity modulation coil mounted on an outer circumference of the neck corresponding to the positioning of the gap(s) of the focusing electrodes.

Abstract: A cathode ray tube includes an evacuated envelope having a panel portion having a phosphor screen, a neck portion and a funnel portion connecting the panel portion and the neck portion; an electron gun housed in the neck portion having a cathode, a first grid electrode, a second grid electrode, plural focus electrodes and an anode arranged in the order named and fixed in predetermined axially spaced relationship by two glass beads; a voltage-dividing resistor attached to one of the two glass beads for producing an intermediate voltage to be applied to a first one of the plural focus electrodes adjacent to the anode by dividing a voltage applied to the anode; and a metal conductor facing and attached to a second one of the plural focus electrodes to surround the voltage-dividing resistor and the one of the two glass beads, the second one of the plural focus electrodes being disposed upstream of the first one of the plural focus electrodes.

Abstract: There is provided a cathode ray tube capable of displaying high quality images by suppressing eddy current from occurring and by realizing the velocity modulation. A cylindrical focusing electrode is divided into first cylindrical focusing electrode 4B and second cylindrical focusing electrode 4T and the gap between the both electrodes formed and divided by optimizing the length of the second cylindrical focusing electrode 4T in the tube axial direction is enlarged substantially to increase the infiltration of the velocity modulating magnetic field to the non-electric space of the focusing electrode 4. An electrode 4a having the equal potential with the focusing electrode 4 is disposed at the gap to suppress eddy current from being generated.

Abstract: The present invention provides an electron gun which is excellent in voltage-resistant characteristics and has a first electrode less deformed, and a method of manufacturing the same.

Abstract: The present invention provides a color cathode ray tube which can improve the focusing characteristics in a wide range of a phosphor screen by setting the total length of a focus electrode divided in multi-stages within a given value and properly selecting the mounting position and the sensitivity of an electrostatic quadrupole lens. A focus electrode G5 which constitutes a final stage main lens includes a plurality of electrode members G5-1, G5-2, G5-3, G5-4 which constitute an electrostatic quadrupole lens and a curvature-of image-field correction lens, and assuming the distance from a surface of the focus electrode G5 which faces an anode G6 in an opposed manner to the final-stage main lens-side position of the electrostatic quadrupole lens as L2, a relationship of 7.55≦L2≦11.5 is set.

Abstract: 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.

Abstract: In an electron gun for a color cathode ray tube apparatus of this invention, one intermediate electrode is arranged between a final acceleration electrode and a focus electrode that make up a main lens, and a voltage divided by a voltage dividing resistor for dividing a voltage to be applied to the final acceleration electrode is applied to the intermediate electrode. A dynamic voltage which increases along with an increase in deflection amount of an electron beam is applied to the focus electrode, and a dielectric portion is formed between the final acceleration electrode and the focus electrode. This dielectric portion is formed on the intermediate electrode. Hence, elliptical distortion of electron beam spots is decreased on the entire surface of a phosphor screen, thereby providing a color cathode ray tube apparatus with a good performance on the entire surface of the phosphor screen.

Abstract: The present invention provides a flat-panel type color cathode ray tube which has the favorable focusing characteristics and can shorten the total length thereof. The color cathode ray tube includes an evacuated envelope which is constituted of a panel 1 which has a diagonal effective diameter of approximately 51 cm, a neck 3 which houses an electron gun 10 and a funnel 3 which connects the panel and the neck. The electron gun 10 includes a cathode, a first electrode, a second electrode, a focusing electrode and an anode electrode. Assuming the equivalent radius of curvature in the X direction of an inner surface of the panel 1 as Rix and the equivalent radius of curvature in the Y direction of an inner surface of the panel 1 as Riy, the distance Lm between the cathode and a screen-side end portion of the focusing electrode is set to 37 mm≦Lm≦45 mm.

Abstract: An in-line electron gun and a color cathode-ray tube using the same. The electron gun comprises cathodes which are disposed in line for emitting electron beams corresponding to different colors, and a focusing electrode for focusing the electron beams; a final acceleration electrode for accelerating the electron beams passed through the focusing electrode. The electron gun comprises astigmatism compensation electrodes which have eaves shape and extend toward main axes of the electron gun and which are disposed at upper and lower portions of apertures of the final acceleration electrode for passing therethrough electron beams emitted from the cathodes on both outsides of the electron gun. The astigmatism compensation electrodes may be pairs of parallel plate electrodes which are disposed in a horizontal direction and at a predetermined distance from each other.

Abstract: A main lens is composed of a dynamic focus electrode, a first auxiliary electrode, a second auxiliary electrode and an anode, which are successively arranged in a direction of travel of electron beams. A sub-lens provided on a cathode side of the main lens is composed of a third grid, a fourth grid and a fifth grid. The first auxiliary electrode is connected to the fourth grid, and both are connected to a voltage supply terminal on a resistor near the fourth grid. A fixed focus voltage is applied to the third grid and fifth grid sandwiching the fourth grid.

Abstract: An electrode of an electron gun for a CRT includes an electron beam passing surface at which electron beam passing holes are formed, a skirt portion extending from an edge of the electron beam passing surface substantially perpendicularly with respect to the electron beam passing surface, a plurality of first embedded portions extending from an end portion of each of the upper and lower sides of the skirt portion and embedded in bead glass, and a second embedded portion formed by cutting a portion of the skirt portion and bending the cut portion and embedded in the bead glass.

Abstract: 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 bulging a portion of a metal plate in the plate thickness direction to such an extent as to correspond to a desired dimension of the thin plate portion by using a die and a punch die, to form a bulged portion, and cutting the bulged portion. With this configuration, it is possible to eliminate such a problem of a related art thin plate portion of a grid electrode for an electron gun, formed by a coining work, that a rib is formed around the thin plate portion; to make narrower a gap between the thin plate portion and a cathode since the diameter of the thin plate portion can be enlarged; and to provide beam apertures at arbitrary positions of the thin plate portion.

Abstract: An electron gun assembly includes a plurality of cathodes arranged in an in-line direction, at least first through fourth grids having electron beam passing holes arranged in an in-line direction, and an insulation support for sandwiching the cathodes and the grids between and fixing the cathodes and the grids from a direction perpendicular to the in-line direction. The second grid and the fourth grid are supplied with substantially the same low potential, the third grid is supplied with a potential higher than the potential of the fourth grid, and the second grid is fixed to the insulation support on a side of the third grid. The third grid has a cup-shaped electrode on a side of the second grid, the cup-shaped electrode including a plane portion having electron beam passing holes, an opening portion, and planting portions planted in the insulation support.

Abstract: A color cathode ray tube equipped with an in-line electron gun comprising three cathodes for emitting three electron beams of an in-line arrangement toward a fluorescent screen, and a main lens for focusing the aid three electron beams on the fluorescent screen. The main lens includes a first main lens electrode and a second main lens electrode arranged in a spaced relationship in a direction of an axis of the tube and having different voltages applied thereto.

Abstract: A color cathode ray tube has a phosphor screen and an electron gun. The electron gun includes an electron beam generating section for emitting three in-line electron beams toward the phosphor screen and an electron beam focusing section for focusing the electron beams onto the phosphor screen. The electron beam focusing section includes at least one cup-shaped electrode having a tubular portion and a flange formed continuously from the tubular portion. The tubular portion has a generally rectangular cross section having an outwardly curved portion at each side thereof in a direction of arrangement of the three in-line electron beams in a plane perpendicular to the color cathode ray tube axis, the flange has a generally rectangular cross section having an outwardly curved portion at each side thereof in the direction of arrangement of the electron beams in the plane perpendicular to the color cathode ray tube axis, and the flange is formed with a locally thinned-down portion.

Abstract: A method for manufacturing an electron gun for a cathode ray tube. The method comprises a first step in which a number of securing means are made in a planar element (e.g. plate or strip), a second part in which the securing means are secured to an insulating support rod, a third part in which the insulating support rod-securing means assembly is detached from the planar element, whereafter connections are made to a stack of electrodes to form the electron gun.

Abstract: To prevent rotation of a generally flat, or planar, grid having three inline beam passing apertures, where the two outer apertures are asymmetric in shape, during assembly of a multi-beam electron gun for use in a color cathode ray tube (CRT), an electron gun alignment jig having three inline generally cylindrical mandrels in combination with a generally flat spacer plate is used. Each of the three mandrels is inserted in a respective grid aperture and the grid is placed in contact with the flat spacer plate. The flat spacer plate includes a recessed portion with an alignment slot. The grid includes a lateral alignment tab adapted for insertion in the spacer plate's matching alignment slot in a tight-fitting manner. With the alignment tab inserted in the alignment slot, the three inline apertures are in precise alignment in the alignment jig and grid rotation is prevented to facilitate electron gun assembly.

Abstract: A supporting member for an electron gun, which is molded and processed from a composition comprising a glass component and an additive, wherein the additive is a material which does not decompose in a temperature range for the molding and processing and which decomposes and evaporates for the first time in the temperature range for embedding an electrode metal in the surface of the supporting member.