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: In an inline three-beam system color cathode-ray tube, there is provided an inline three-beam system color cathode-ray tube electron gun in which beam spot shapes of three electron beams on the left and right end portions of a fluorescent screen may be uniformed as much as possible and focusing voltages may be adjusted with ease and also deteriorations of beam spot shapes of three electron beams on the left and right end portions of the fluorescent screen may be alleviated and a satisfactory convergence characteristic may be obtained on the whole region of the screen. A color cathode-ray tube electron gun includes trisected focusing electrodes.

Abstract: A cathode-ray tube electron gun can alleviate unwanted radiation caused when cathodes and a first electron gun constitute an antenna by increasing the number of conduction leads of a first electrode of a cathode-ray tube electron gun from one to a plurality of conduction leads.

Abstract: A color-cathode-ray-tube electron gun of the present invention comprises a three-divided first focus electrode and a second focus electrode set so as to oppose the first focus electrode: wherein a parabolic-waveform voltage synchronizing with horizontal scanning is applied to the second focus electrode; of the three-divided focus electrodes, a built-in resistor electrically connecting the central electrode and the both outside electrodes is provided; a voltage on which a first voltage component having a waveform similar to serration and synchronizing with horizontal scanning, and a second voltage component having a parabolic waveform convex in the direction opposite to the parabolic waveform and synchronizing with horizontal scanning are superimposed is applied to the central electrode, and a voltage obtained by passing the voltage on which the first voltage component and second voltage component are superimposed through the built-in resistor is applied to the both outside electrodes.

Abstract: In an inline type electron gun incorporated in a color cathode ray tube, a plurality of electron beams are produced from each of cathodes. A plurality of beam apertures are formed, per cathode, in a first grid and a second grid of the electron gun. The second grid consists of a plurality of split grids spaced apart from each other in the traveling direction of electron beams. The beam apertures formed in at least one of the split grids constituting the second grid are positionally eccentric to the beam apertures formed in another split grid. A voltage of a waveform synchronized with a deflection period is impressed from a circuit in a display apparatus to at least one of the split grids constituting the second grid. And the electron lens effect of the second grid is changed in accordance with the impressed voltage waveform, thereby correcting the positional deviation of the plural electron beams caused in the peripheral area of a fluorescent screen.

Abstract: An electron gun according to the present invention is provided with a grid having a beam aperture with a small diameter. In addition, the electron gun of the present invention is such that a second grid thereof is comprised of a plurality of grid plates each having the beam aperture. The electron gun of the present invention is such that a required grid comprising the electron gun is comprised of the grid plates each having the beam apertures. At least one grid plate among the plurality of grid plates has a beam aperture with an aperture diameter of less than 80% or less of an overall pseudo plate thickness. When compared with the case of comprising the grid with one sheet of metal, it becomes possible to provide a beam aperture with a small diameter.

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: There are disclosed a resistor whose life span is long and whose miniaturization can be implemented by restraining a short-circuit among a resistor pattern, an electron gun for a cathode-ray tube provided with the resistor and a method of manufacturing the resistor. In the resistor (2), the natrium concentration of overcoat glass (4) coated on a surface thereof and covering its resistance patterns (5) is set to less than 500 ppm, and the resistor 2 is manufactured in such a manner that at a time when the overcoat glass (4) is manufactured, after a process (S2) of crushing a glass cullet which is a raw material of the overcoat glass (4), the crushed glass powder is raised with pure water to thereby set the natrium concentration thereof to less than 500 ppm.

Abstract: In an inline 3-beam system color cathode-ray tube, an inline 3-beam system color cathode-ray tube electron gun is able to uniformise shapes of beam spots of three electron beams on the right and left end portion of a fluorescent screen as much as possible.

Abstract: A color cathode-ray tube which increases the degree of freedom in designing its main electron lens, decreases the electron beam spot diameter, and achieves high resolution, in which the between the focusing electrode (15) applied with the focusing voltage (Vf) and the anode electrode (17) applied with the anode voltage (Va), there is provided an intermediate electrode (16) applied with the potential Vm which is higher than the focusing voltage (Vf) and lower than the anode voltage (Va), and the focusing electrode (15). These voltages are set by a dividing resistor (30).

Abstract: A focus electrode of an electron gun for color cathode ray tubes of the present invention is divided into at least two focus electrodes, three electron beam passage apertures are provided on each focus electrode, electron beam passage apertures disposed on the one end sides of at least one focus electrodes have different astigmatism respectively from electron beam passage apertures disposed on the other end sides, electron beam passage apertures disposed on both sides of the focus electrode have different astigmatism from electron beam passage apertures disposed on both sides facing each other of the adjacent focus electrodes, the electron beam passage apertures disposed at the center of the respective focus electrodes are shielded. The invention provides an in-line three beam type electron gun for color cathode ray tubes which is capable of equalizing the beam spot configuration of three electron beams on the right and left ends of the fluorescent screen.

Abstract: To propose a color cathode-ray tube which increases the degree of freedom in designing its main electron lens, decreases the electron beam spot diameter, and achieves high resolution, in which between the focusing electrode (15) applied with the focusing voltage (Vf) and the anode electrode (17) applied with the anode voltage (Va), there is provided the intermediate electrode (16) applied with the potential Vm which is higher than the focusing voltage (Vf) and lower than the anode voltage (Va), and the focusing electrode (15), the anode electrode (17) and the intermediate electrode (16) are respectively formed of cylindrical bodies each having an ellipse cross-section and closed by the electric field correcting electrode plates (25, 26, 27, 28) having three electron beam penetrating portions bored therethrough so as to be arrayed in an in-line fashion.

Abstract: To provide a cathode ray tube stabilizing the potential at an inner wall of a neck, providing stabilized nocking effect by forced discharge among electrodes or the like, promoting the withstand voltage characteristic of an electron gun and preventing deterioration in image quality resulted from straying leakage current, an electron gun where both ends of metal lines are welded to an intermediate electrode and a focus electrode (5-1-th electrode) to surround beading glass and a voltage dividing resistor, is sealed in a neck portion and thereafter, the metal lines are heated by high frequency heating by which a metal film is formed on surfaces of an inner wall of the neck and the voltage dividing resistor and the beading glass.

Abstract: The present invention provides a cathode-ray tube provided with an electron gun capable of emitting electron beams of vertically elongate cross section.A beam control electrode (G2) is fabricated by forming beam passage holes (22R, 22G, 22B) in thin portions (20R, 20G, 20B) of a reduced thickness of an electrode plate (18), and forming excess metal relieving slots (40R to 45B) on the opposite sides of the beam passage holes (22R, 22G, 22B), respectively. An electron gun employing the beam control electrode (G2) is capable of automatically correcting the cross section of beams so that the beams form substantially circular spots in the periphery of a screen. Thus, the deterioration of picture quality attributable to the distortion of the cross section of the beams can be avoided and pictures can be displayed in an improved picture quality.

Abstract: The present invention provides a cathode-ray tube provided with an electron gun capable of emitting electron beams of vertically elongate cross section.A beam control electrode (G2) is fabricated by forming beam passage holes (22R, 22G, 22B) in thin portions (20R, 20G, 20B) of a reduced thickness of an electrode plate (18), and forming excess metal relieving slots (40R to 45B) on the opposite sides of the beam passage holes (22R, 22G, 22B), respectively. An electron gun employing the beam control electrode (G2) is capable of automatically correcting the cross section of beams so that the beams form substantially circular spots in the periphery of a screen. Thus, the deterioration of picture quality attributable to the distortion of the cross section of the beams can be avoided and pictures can be displayed in an improved picture quality.

Abstract: An in-line electron gun for a color cathode ray tube having a main lens comprised of an in-line focusing electrode and accelerating electrode, with which it is possible to easily improve an assembly precision of field-correcting electrode plates provided at the focusing electrode and accelerating electrode and having three through apertures through which the R, G, and B electron beams pass and with which it is possible to easily perform an adjustment of aberration of the main lens. The two side through apertures among the three through apertures formed in the field-correcting electrode plate provided at the focusing electrode and accelerating electrode are formed basically as circular apertures with arc shaped cut-away portions continuous with the outside of the circular apertures and concentric with the circular apertures.

Abstract: A cathode-ray tube in which outer convergence plates as constituents of the convergence plate assembly in the electron gun are supplied with individual voltages so that the horizontal misconvergence at the center portion and at the peripheral portions of the screen are positively corrected and in the arrangement the anode button is provided with a plurality of voltage supply pins. Further, the end portions of the two lead wires which are introduced form the anode button are opened outwardly so that the lead wires are prevented from coming in contact with the bead glass.

Abstract: A cathode-ray tube which has an electron gun and a correcting unit with a magnetic device electrically coupled to a final electrode of the electron gun so as to selectively apply a uniform magnetic field to required ones of a plurality of electron beams, so as to thereby correct the path of a selected electron beam without causing distortion in the shape of the beam spot.