摘要:
A cathode assembly (27) includes a thermally conductive insulating substrate (21) having a pair of opposing surfaces. A cathode base member (24) is formed on one surface of the insulating substrate, and a heating member (25) for heating the cathode base member is formed on the other surface of the insulating substrate. A heater electrode terminal (26) is fixed to the electrode of the heating member through a metal layer (26a). A first grid (30) is fixed to the insulating substrate to oppose the cathode base member through a predetermined space.
摘要:
A color cathode ray tube apparatus having an electron gun assembly including a device for modulating a scanning velocity of electron beams at an auxiliary lens section for clarifying an image projected to a screen is disclosed. The color cathode ray tube apparatus comprises an enclosure having a panel section, a funnel section and a neck section, an electron gun assembly, including rear electrodes disposed in front of three cathodes for emitting electron beams, each having three through-holes for passing the beams for forming an auxiliary lens for preliminarily focusing the beams, and a front electrode located in front of the rear electrodes for forming a main lens in cooperation with one electrode thereof for further focusing the beams and converging the beams. The rear electrodes have a pair of electrode members having three beam through-holes defined by cylindrical projections, oblique surfaces opposed at a predetermined interval, formed of the cylindrical projections, each surface crossing perpendicularly to a horizontal plane for scanning the beams and having a predetermined angle with respect to a plane perpendicular to the axis of an electron beam path. The scanning velocity modulating device is connected with the pair of electrode members for supplying a modulating voltage thereto, when luminance values of a video signal arrive at a predetermined level.
摘要:
In an electron gun assembly, three electron beams emitted from cathodes are passed through an electrode arrangement in which two intermediate electrodes are arranged between focusing are accelerating electrodes. A focusing voltage which is varied depending on an deflection of the electron beam is applied to the focusing electrode and an accelerating voltage is applied to the accelerating electrode. A resistor is connected between the accelerating electrode and the earth through a variable resistor and intermediate points of the resistor are connected to the intermediate electrodes. Thus, convergent and divergent lenses are formed between the focusing electrode and the intermediate electrode and between the accelerating electrode and the intermediate electrode. The lens powers of the convergent and divergent lenses are varied in accordance with the adjustment of the variable resistor.
摘要:
An electron gun for a color-picture tube includes adjacent low and high potential electrodes composing an electron lens, which electrodes have electron beam path holes horizonally formed with electric-field correcting members or raised portions. According to this construction, vertical equipotential lines are projected into the electrode so that the low potential electrode adds to electron beams a vertical focusing effect more strongly than a horizontal one and the high potential electrode adds to electron beams a vertical divergent effect more strongly than a horizontal one. The section of the electron beam in a deflection region has an ellipse shape whose major axis extends horizontally, resulting in suppressing a halo portion on the screen. The electron beam is properly focused horizontally and vertically so that the electron beam spot has a circular shape on the center of a screen. It results in improving the resolution on the periphery of the screen without having to lower the resolution on the center of the screen.
摘要:
In a picture tube comprising an envelope including a phosphor screen and an electron gun generating an electron beam, wherein the electron beam is deflected by magnetic deflecting fields, the electron gun comprising a triode section and a focusing section along a path of the electron beam, the triode sections being provided with an electrode containing a non-circular aperture having major and minor axes of symmetry, the major axis being parallel to a horizontal direction the focusing section having a means for forming an electrostatic focusing lens having a vertical focal length and a horizontal focal length, said vertical focal length more elongated than said horizontal focal length.
摘要:
An electron gun comprises cathodes for emitting three electron beams, and grid electrodes forming at least two asymmetric electrostatic lenses along three electron gun axes. The lenses focus and deflect the electron beams to converge on a color cathode ray tube screen. The first asymmetric lens, in response to the focus voltage being varied, deflects the beam at a first angle and the second asymmetric lens deflects the beam at a second angle to compensate for the first angle deflection caused by the first asymmetric lens.
摘要:
A color cathode ray tube apparatus is provided with an electron gun assembly which emits three electron beams and focuses and converges the electron beam onto a phosphor screen. In the gun assembly, the electron beams generated from cathodes are accelerated and controlled by first and second grids and pass through third, fourth and fifth grids. The third and fourth grids have single rectangular apertures common to the three electron beams, respectively, which are faced to each other and have different heights and widths. Each of the fourth and fifth grids have individual apertures which allow the corresponding electron beams to pass therethrough, respectively. The third and fifth grids is maintained at fixed potentials and a potential of the fourth grid is adjusted. Thus, individual focusing and convergence electron lenses are formed between the fourth and fifth grids. A single and common asymmetrical electron lens is formed between the third and fourth grids, when a potential difference between the third and fourth grids is produced. A misconvergence of three electron beams produced due to the adjustment of the individual electron lenses is corrected by the common asymmetrical electron lens in such a manner that the side electron beams are deflected in accordance with the potential difference.
摘要:
A cathode ray tube having an electron gun assembly in which a plurality of electrodes constitute an electron beam generating unit for generating electron beams, and an electron lens unit for focusing the generated beams on a predetermined location on a phosphor screen. The electron gun assembly further contains a pair of insulating support rods for supporting the electrodes, a resistor unit for applying a voltage to at least one of the electrodes. A metal ring is mounted in contact with a predetermined electrode of the electron lens unit and surrounds the insulating support rods. Terminal voltage pickup terminals apply a voltage to the resistor unit. At least a first and second intermediate voltage pickup terminal supply a voltage from the resistor unit to a first and second electrode. The first and second intermediate voltage pickup terminals are located in relation to the metal ring such that a discharge is prevented and image quality is preserved.
摘要:
In an electron gun assembly, three electron beams emitted from cathode are focused by focusing electrodes and directed to accelerating electrodes through intermediate electrode. Three electron beams are converged on a predetermined point near a screen by accelerating electrodes. The accelerating electrodes are supplied with a first potential and are connected to a ground through a resistor and a stem pin. The intermediate electrodes are connected to the resistor and are maintained at a second potential. The focusing electrodes are connected to another stem pin and supplied with a third potential through another stem pin so that the third potential can be independently adjusted.
摘要:
An electron gun for color-picture tube device comprises a final accelerating electrode and a focusing electrode divided into plural electrode units in the axial direction of the tube. A first focusing electrode unit adjacent to the final accelerating electrode is connected to a second focusing electrode unit adjacent to the first focusing electrode unit through a resistor. A focusing voltage being change in synchronous with the deflection of an electron beam is applied to the first focusing electrode unit. The resistor is used for removing the a.c. components from the focusing voltage. Then, the removed focusing voltage is applied to the second focusing electrode. For the electron beam deflected on the peripheral part of the screen, a quadrupole lens is formed. On the first focusing electrode unit side opposite to the second focusing electrode unit are formed first electron beam path holes whose major axes extend horizontally. On the second focusing electrode unit side opposite to the first focusing electrode unit are formed second electron beam path holes whose major axes extend vertically. As a result, the quadrupole lens serves to suppress a halo portion.