摘要:
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.
摘要:
An electron gun for a color CRT includes a triode including cathodes for emitting electron beams, a control electrode, and a screen electrode, at least two focusing electrodes on the same axis of the triode portion for forming a quadrupole lens, and a final focusing electrode forming a large diameter lens with the focusing electrodes and through which three electron beams commonly pass. The electron gun includes a correction unit producing a correction force acting on the three electron beams and that is larger for two side electron beams than for a central electron beam of the three electron beams when a dynamic voltage, synchronized with a deflection signal, is applied to at least one of the focusing electrodes for forming the quadrupole lens.
摘要:
A cathode ray tube (CRT) has an electron gun including a cathode for emitting electron beams, a control electrode for controlling emission of the electron beams from the cathode, and a screen electrode for accelerating the flow of the electron beams passing the control electrode are arranged in series. In the CRT, during a scanning period, a voltage applied to at least one of the control electrode and the screen electrode changes in response to a voltage of a data signal applied to the cathode. The control electrode and screen electrode each include three mutually electrically insulated sections for independently controlling each of three electron beams passing through the electrodes.
摘要:
An electron gun for a color cathode ray tube includes cathodes, a control electrode, and a screen electrode, forming a triode, first, second, third, and fourth focusing electrodes, sequentially arranged relative to the screen electrode and forming at least one first quadrupole lens, fifth and sixth focusing electrodes, adjacent to the fourth focusing electrode and forming at least one second quadrupole lens, and a final accelerating electrode, adjacent to the sixth focusing electrode and forming a main lens.
摘要:
An electron gun for a cathode ray tube has a cathode structure, a control electrode, a screen electrode, focusing electrodes, and a final accelerating electrode. R, G, and B electron apertures of one pair of the focusing electrodes face each other to form a quadrupole lens unit, to which an AC voltage having a relatively low peak or a static voltage is applied to converge R, G, and B electron beams into one point, even when the electron beams deviate to the corner of a screen. Asymmetrical enlargement portions are included in the rims of each of the R and B electron beam apertures.
摘要:
A color CRT is driven by focusing and accelerating an electron beam emitted from a cathode by forming electron lenses including a quadrupole lens by applying a predetermined voltage to the cathode of an electron gun installed in a neck portion of a funnel and each of electrodes, focusing the electron beam on a fluorescent film by applying a voltage having a horizontal dynamic waveform having a ratio of slopes of 6.85 or more between a unilateral area of 90% and a unilateral area of 50% of a raster area to which a video signal of an image is applied, to at least one of the electrodes forming the quadrupole lens, synchronized with a horizontal deflection signal of a deflection yoke installed at a cone portion of the funnel, in order to deflect an electron beam emitted from the electron gun and scan the deflected electron beam onto the fluorescent film of a panel sealed to the funnel, and forming an image by having the deflected electron beam land on the fluorescent film and excite the fluorescent film. Thus, resolution of the overall screen is increased.
摘要:
An electron gun used with a multi-media monitor with a low cathode voltage and improved focusing performance. The electron gun, which includes a cathode, a control electrode, a screen electrode, and a plurality of focusing electrodes to focus and accelerate an electron beam, is designed to satisfy the condition that a value of β is greater than or equal to 0.222 or a value of k is greater than or equal to 0.11, where β=T1/D, k=T1/L, T1 denotes a thickness of the control electrode, D denotes a diameter of an electron beam aperture of the control electrode, and L denotes the distance between a beam-entering surface of the control electrode and a beam-emitting surface of the screen electrode.
摘要:
An electrode of an electron gun for a cathode ray tube with an improved structure so as to enhance the flatness of the electrode. The electrode includes an electron beam passing plane on which one or more electron beam passing holes are formed, an upper sloping portion of a truncated cone shape, slantingly extending downward and outward from the peripheral edges of the electron beam passing plane, and a vertically extending portion of a cylindrical shape, extending downward from the lower portion of the upper sloping portion and extending substantially perpendicular to the electron beam passing plane.
摘要:
A cathode ray tube having a reduced variation in convergence drift. An inner graphite layer coats the inner surface of a funnel, and a metal coating layer is electrically connected with the inner graphite layer on the inner surface of the neck portion. The metal coating layer does not extend to a position directly beside the focusing electrode most remote from the cathode of the electron gun of the cathode ray tube, and has a surface resistivity of 107&OHgr;/□ or less.
摘要:
A cathode ray tube assembly includes a funnel having a neck, an electron gun having an electron emitter within the neck and having at least two focus electrodes for forming an electron lens for focusing and accelerating electron beams emitted from the electron emitter, lead pins extending through the neck and connected to the first and second focus electrodes, and a socket with pin connection terminals connectable to the lead pins; a voltage applying unit for applying an AC voltage to at least one of the focus electrodes through a lead pin connected to the focus electrode; and a voltage drop unit for reducing the AC voltage applied by the voltage applying unit to a second of the focus electrodes so that a reduced voltage is applied to a lead pin connected to the second focus electrode, the voltage drop unit being connected to the lead pins through pin connection terminals of the socket.