Goldstar, Co., Ltd.

Jin Y Choi

Myung Ho Park

Nam J Koh

An electron gun for a color cathode ray tube contains a cathode, first grid, second grid and third grids, sequentially disposed between the cathode and a screen, and wherein the vertical length of electron beam passing hole formed on the first and third grids is longer than the horizontal length thereof and the vertical length of an electron beam passing hole formed on the second grid is shorter than the horizontal length thereof.

Electron guns for precluding distortion of beam spots

This invention relates to an inline electron gun for a color cathode ray tube, more particularly to an inline electron gun which can provide high resolution by controlling intensity of electrostatic lenses that controls electron beams according to intensity of current, dynamically. The electron gun for a cathode ray tube includes a three electrode part having a part formed of a plurality of inline electron beam emitting means for emitting electron beams and the other part formed of control electrodes and acceleration electrodes for controlling quantity of the emission and forming a crossover of the electron beams, a plurality of focusing electrodes and positive electrodes forming a main electrostatic focusing lenses for focusing the electron beam onto a screen, the electron beam emitting means and the plurality of electrodes are aligned in line with the tube axis spaced in a certain interval, successively, and a supplementary electrode having a fixed thickness and synchronizing to application signal of the electron beam emitting means, the supplementary electrode is positioned between the acceleration electrode and the focusing electrode adjacent to the acceleration electrode and is for forming an enlargement electrostatic lens for controlling the divergence angle of the electron beam according to the intensity of current.

CRT electron gun for controlling divergence angle of electron beams

An electron gun body for a color cathode ray tube includes an electron beam forming region formed by cathodes, first and second grids, and a main focusing lens having first and second accelerating and focusing electrodes for substantially focusing three electron beams from the electron beam forming region. The first and second accelerating and focusing electrodes are provided with through holes for passing the three electron beams and upper rims respectively bent from the outer circumferences of the electrodes toward the through holes, in which a first inclined extension electrode having a vertically-provided sloped portion and bottom portion, and a center hole opened to reach a bent plane of the sloped portion in the bottom portion is installed into the first accelerating and focusing electrode to fix one side of the first inclined extension electrode to connect with an inwardly-bent portion of the one upper rim, and a second inclined extension electrode having projections parallel in both directions on the same plane of a head portion is installed into the second accelerating and focusing electrode, while forming the vertical inner diameter of the projection to be smaller than that of the upper rim, to fix one side of the second inclined extension electrode to connect with an inwardly-bent portion of the other upper rim. Thus, astigmatism is eliminated without using a separate correction electrode to improve resolution on the periphery of a screen.

Electron gun body for a color cathode ray tube

An electron gun for a color cathode ray tube is disclosed in which a correction electrode having horizontally elongated electron beam passing holes is fixed in a second accelerating/focusing electrode located between an inner shield fixed to the second accelerating/focusing electrode and a shield cup, thereby correcting astigmatism of an electron beam.

Electron guns for color cathode ray tube

An electrode structure of an electron gun for a cathode ray tube has a plurality of cathodes for emitting thermions, grid electrodes to form an electron beam of thermions, a first acceleration and focus electrode, a second acceleration and focus electrode and a dipole lens system which forms a circular beam spot on a screen of the cathode ray tube by removing the horizontal lengthening of the beam spot due to an increase in the amount of deflection of the beam in the peripheral portion of the screen of the cathode ray tube. The dipole lens system has a first electrode and a second electrode to which a dynamic voltage of a predetermined range is applied. The first electrode of the dipole lens system has opening portions which pierce the upper and lower sides of the first accelerator and focus electrode. The second electrode of the dipole lens system has horizontal plates which cover the opening portions with a predetermined gap. By applying a dynamic voltage to the second accelerator and focus electrode in the peripheral portion of the screen of the cathode ray tube, the focal distance of the main focus lens between an anode electrode and the second accelerator and focus electrode is increased, thereby removing the halo portion of the beam spot.

Growing community of inventors

Kyungsangbuk-Do, South Korea

Jin Y Choi