• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    According to the present invention, an asymmetric lens is formed at the three poles of the electron gun in the electron gun for the color cathode ray tube using the uniform magnetic field deflection yoke to prevent the resolution deterioration at the periphery of the screen. The present invention provides a cathode for radiating an electron beam in a color cathode ray tube having a uniform magnetic field deflection yoke, a triode consisting of a control electrode and an accelerating electrode for adjusting and accelerating the radiation amount of the electron beam, and for focusing the electron beam on a screen. In the electron gun for a color cathode ray tube composed of a plurality of focusing electrodes and an anode forming an electrostatic focusing lens, at least one of the electrodes constituting the three-pole portion has a lens means in which the focusing action in the horizontal and vertical direction is non-axially symmetrical The angle of incidence in the horizontal direction of the electron beam incident to is smaller than the angle of incidence in the vertical direction.
    公开号:KR19980059932A
    申请号:KR1019960079279
    申请日:1996-12-31
    公开日:1998-10-07
    发明作者:김현철
    申请人:구자홍；엘지전자 주식회사；
    IPC主号:
    专利说明:

    Electron gun for colored cathode ray tube
    The present invention relates to an electron gun for a color cathode ray tube, and more particularly, to an electron gun for a color cathode ray tube configured to form an asymmetric lens on an electron gun triode to prevent resolution deterioration at the periphery of a screen.
    In general, the color cathode ray tube has a panel (1) and funnel (2), an electron gun (3) installed inside the neck portion of the funnel, the deflection yoke (4) provided on the outside, the inner surface of the panel It consists of a shadow mask (5) and the fluorescent surface (6) installed.
    In addition, the conventional electron gun employed in the color cathode ray tube as described above is composed of a triode and a main lens, as shown in Figure 2, the three poles control the negative electrode 11 in which the heater 10 is embedded and the hot electrons emitted from the cathode. And an accelerating control electrode 12 and an accelerating electrode 13, and the main lens unit includes an accelerating electrode 14 and an anode 15 for focusing and finally accelerating the electron beam 7 generated at the triode.
    The control electrode 12 is grounded, a voltage of 500 to 1000 V is applied to the acceleration electrode 13, a high voltage of 25 to 35 KV is applied to the anode 15, and 25 to 30% of the anode voltage to the focusing electrode 14. The corresponding intermediate voltage is applied.
    According to the conventional electron gun for color cathode ray tubes configured as described above, an electrostatic lens is formed by a voltage difference between the focusing electrode 14 and the anode 15 and a electron beam 7 is formed at the triode, in particular, as a predetermined potential is applied to each electrode. Is focused at the center of the fluorescent surface 6, and the electrostatic lens due to the voltage difference between the focusing electrode 14 and the anode 15 is called a main lens.
    At this time, the deflection yoke (4) attached to the neck portion of the funnel (2) acts to deflate the electron beam focused at the center of the fluorescent screen to the entire area of the screen, which is usually a color employing an in-line electron gun. In the cathode ray tube, self-convergence type deflection yokes using a non-uniform magnetic field are applied to converge the three electron beams in one place of the fluorescent surface because R, GB three electron beams are arranged side by side.
    As shown in FIGS. 3A and 3B, the distribution of the magnetic field generated by the self-converging deflection yoke is a pincushion type, and the vertical deflection field is a barrel type. (Mis-convergence) is prevented.
    3A and 3B, when the magnetic field generated in the deflection yoke is separated into two-pole and four-pole components, the two-pole component serves to deflect the electron beam in the horizontal and vertical directions, and the four-pole component is the electron beam. By focusing in the vertical direction and diverging in the horizontal direction, astigmatism is generated to distort the electron beam spot.
    In addition, even in the near-uniform magnetic field, due to the fine pincushion or barrel magnetic field component, the electron beam undergoes significant astigmatism at the periphery of the fluorescent surface, and thus the electron beam slot tends to be distorted.
    4 illustrates the distortion phenomenon of the electron beam spot as described above in more detail.
    As shown in FIG. 4, the deflection field is not applied at the center of the screen, and thus the electron beam spot has the correct shape. Since haze 18, which is a phenomenon of low density up-and-down spreading up and down, occurs, the resolution deteriorates, especially at the periphery of the screen, and this phenomenon becomes more severe as the screen is larger or the deflection angle is larger.
    This phenomenon is caused by a large amount of deflection aberration at the center point of the deflection yoke, and the horizontal direction at the deflection center of the electron beam cancels the divergence of the deflection magnetic field and the focusing force due to the distance difference and is almost accurate. On the other hand, it is necessary to adjust the electron beam at the three poles in order to reduce the haze at the periphery caused by overlapping the focusing force due to the aberration and the distance difference due to the aberration in the horizontal direction.
    5 is an explanatory diagram showing astigmatism and beam trajectory caused by deflection yoke when the electron beam is deflected to the periphery of the screen.
    The deflection yoke serves to focus the electron beam in the horizontal direction and to focus in the vertical direction. When the electron beam is deflected to the periphery, the over focusing component due to the distance difference in the horizontal direction and the under focusing due to the deflection yoke The components cancel each other out to give a nearly accurate focusing shape, but in the vertical direction, the over focusing component due to the distance difference and the vertical over-percussion component of the deflection yoke overlap each other, resulting in a severe overfocusing phenomenon. When deflected, the phenomenon of the vertical spreading of the electron beam is severe, resulting in deterioration of the resolution of the peripheral part.
    As described above, in order to improve the spreading phenomenon in the periphery of the screen, it is necessary to adjust the electron beam at the three poles, and for this purpose, a technology for forming the three poles asymmetrically has been developed.
    Figure 6 shows a prior art (US Patent No. 4,886,998, Korean Patent Publication No. 91-1511, etc.) for forming an asymmetric tripolar portion, the horizontal width of the acceleration electrode 13, the second electrode of the horizontal width larger than the vertical width A slot 21 is formed and the slot 21 is opposed to the focusing electrode which is the third electrode.
    The slot 21 serves to generate an electron beam in a horizontal direction and to focus in a vertical direction, and the horizontal width and the vertical width of the slot are larger than the electron beam through-hole 20.
    In addition, the thinner the slot, that is, the deeper the slot, receives less deflection aberration in the vertical direction from the deflection center, thereby reducing the resolution degradation of the periphery.
    On the other hand, if the improvement is impossible as a tripolar asymmetric lens, the focusing electrode is divided into two, a constant focus voltage is applied to the first focusing electrode, and a dynamic voltage that is changed in synchronization with the deflection signal of the deflection yoke is applied to the second focusing electrode. Many methods have been adopted to improve resolution degradation.
    However, the conventional technique as described above can be applied only to a deflection yoke using a non-uniform magnetic field.
    That is, since spot distortion, which is a resolution deterioration phenomenon due to a non-uniform magnetic field, is a phenomenon in which the over focusing phenomenon caused by the distance difference between the center part of the screen and the phenomenon caused by the deflection aberration of the deflection yoke overlaps, Only applicable to deflection yokes using non-uniform magnetic fields.
    However, in recent years, the opposite color display tube (CDT), which requires high resolution, has developed into a tendency to use a uniform magnetic field deflection yoke because of spot distortion at the periphery, and when the uniform magnetic field deflection yoke is used, Since the aberration component disappears, only the overfocusing phenomenon caused by the distance difference is improved, thereby preventing the resolution deterioration of the peripheral portion.
    In addition, the above focusing phenomenon can be improved by applying a dynamic voltage that changes in synchronization with the deflection signal of the deflection yoke.
    In general, when a non-uniform magnetic field is used, the focusing electrode should be divided into a first focusing electrode and a second focusing electrode, and a quadrupole lens should be operated therebetween. However, when a uniform magnetic field deflection yoke is applied, the focusing electrode It is sufficient to apply a dynamic voltage that changes in synchronization with the deflection signal to the deflection yoke to the focusing electrode without dividing.
    This is because, in the uniform magnetic field deflection yoke, if the overfocusing phenomenon due to the distance difference is improved, the peripheral resolution deterioration is prevented.
    However, there is a problem even when using a uniform magnetic field deflection yoke.
    For example, an electron gun for a common color cathode ray tube uses an asymmetric main lens to reduce spherical aberration of the main lens. These main lenses generally do not use a cylindrical lens, but the horizontal lens is a vertical lens with different asymmetry. Because it becomes smaller.
    That is, since the horizontal and vertical lenses of the main lens are different from each other as shown in FIG. 7, when the dynamic focus voltage is applied to the main lens, it may be accurate at the center of the screen due to the difference in the horizontal and vertical focusing force, This results in degradation of the resolution.
    This is because, firstly, the main lens is smaller than the horizontal, and secondly, the tripolar asymmetric lens diverges horizontally and focuses vertically.
    In particular, even though the main lens diameter is small in the horizontal direction, the tripolar asymmetric lens serves to grow the electron beam in the horizontal direction. That is, the horizontal incidence angle α is large but the vertical incidence angle β 1 is small. In the lens, the spherical aberration in the horizontal direction increases further and the vertical direction decreases inversely.
    As a result of this phenomenon, when the dynamic voltage is applied, the spot size changes with respect to the dynamic voltage change, which is caused by the difference between the horizontal and vertical lens diameters.
    The present invention is to improve the above problems that occur when using a uniform magnetic field deflection yoke.
    In order to solve the above problem, as shown in FIG. 8, the lens mirror should be designed to have the same size with respect to the change of the dynamic voltage.
    This means that since the lens diameter in the horizontal direction of the main lens is smaller than the vertical direction, the incident angle of the electron beam should be larger than the vertical angle when the electron beam generated from the triode is incident on the main lens.
    In other words, in the case of non-uniform magnetic field, the electron beam is composed of a horizontal electron beam whose horizontal is larger than vertical, so that the deflection aberration is reduced at the deflection center of the deflection yoke. The non-uniform magnetic field deflection yoke should be configured so as to be opposite to the applied triode.
    In other words, the electron beam incident in the horizontal direction of the main lens has a small lens diameter, so that the angle of incidence of the electron beam is reduced to reduce the main lens spherical aberration, and the electron beam incident in the vertical direction is almost the same as the spherical aberration in the horizontal direction. To increase the angle of incidence of the electron beam.
    In the above configuration, the electron beam generated from the triode is a longitudinal electron beam of which the horizontal is smaller than the vertical.
    An object of the present invention is to provide a color cathode ray tube configured such that the divergence angle of the electron beam in the triode is made smaller than the horizontal.
    1 is a schematic configuration diagram of a colored cathode ray tube
    2 is a configuration diagram of an electron gun for a general color cathode ray tube;
    3 is a distribution diagram of the non-uniform magnetic field generated in the conventional self-convergence yoke
    Figure 4 is a front view showing the distortion phenomenon of the electron beam spot in the conventional electron gun for color cathode ray tube
    5 is an explanatory diagram showing astigmatism and beam trajectory caused by deflection yoke when the electron beam is deflected to the periphery;
    6 is a front view and a sectional view of a conventional electrode for forming an asymmetric tripolar portion;
    7 is an optical schematic diagram when using a non-uniform magnetic field deflection yoke.
    8 is an optical schematic diagram when using a uniform magnetic field deflection yoke.
    9 is a front view and a cross-sectional view of an electrode showing an embodiment of the present invention
    Explanation of symbols for main parts of the drawings
    11: cathode 12: control electrode
    13: acceleration electrode 14: focusing electrode
    15: anode 21, 22: slot
    Various methods can be considered to make the divergence angle of the electron beam at the triode smaller than horizontal.
    FIG. 9 shows, as one embodiment, a vertical slot 22 having a larger vertical position than a horizontal surface on a surface of the acceleration electrode 13 that faces the focusing electrode 14. As a result, the divergence angle of the electron beam becomes larger than the horizontal, so that the resolution deterioration of the peripheral portion of the screen can be prevented when the deflection yoke is uniformly applied.
    In addition, a horizontal slot having a larger horizontal plane than a vertical plane is formed on a surface of the both sides of the focusing electrode 14 opposite to the acceleration electrode, or a vertical slot having a vertical slot larger than the horizontal is formed on a surface of the both sides of the acceleration electrode that faces the control electrode. Even when formed, the divergence angle of the electron beam becomes larger than the horizontal.
    The same effect can also be obtained when a horizontal slot is formed on a surface of the control electrode 12 opposite to the acceleration electrode, or a vertical slot is formed on a surface of the control electrode 12 opposite to the negative electrode.
    On the other hand, when the horizontal slot is formed on the surface of the both sides of the control electrode that faces the acceleration electrode, and the vertical slot is formed on the surface of the both sides of the acceleration electrode that faces the control electrode, or on the opposite side of the acceleration electrode. Even when the vertical slot is formed on the surface and the gray slot is formed on the surface of the focusing electrode facing the acceleration electrode, the divergence angle of the electron beam becomes larger than the horizontal.
    According to various embodiments of the present invention, the divergence angle of the electron beam may be made larger than horizontal, and thus, when applied to a uniform magnetic field deflection yoke, the degradation of resolution at the periphery of the screen may be prevented to obtain a high quality screen. Will be.
    权利要求:
    Claims (8)
    [1" claim-type="Currently amended] In a color cathode ray tube having a uniform magnetic field deflection yoke, a triode comprising a cathode emitting an electron beam, a control electrode and an accelerating electrode for controlling and accelerating the radiation amount of the electron beam, and a main electrostatic focusing lens for focusing the electron beam on the screen. An electron gun for a color cathode ray tube composed of a plurality of focusing electrodes and an anode to be formed, wherein at least one of the electrodes constituting the triode has a lens means in which horizontal and vertical focusing are non-axisymmetrically aligned. An electron gun for a color cathode ray tube, characterized in that the incident angle in the direction is smaller than the incident angle in the vertical direction.
    [2" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein a vertical slot having a greater verticality than a horizontal line is formed on a surface of the acceleration electrode opposite to the connection electrode.
    [3" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein a horizontal slot having a horizontal side larger than a vertical side is formed on a surface of the connection electrode facing the acceleration electrode.
    [4" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein an elongated slot having a greater verticality than a horizontal plane is formed on a surface of both surfaces of the acceleration electrode facing the control electrode.
    [5" claim-type="Currently amended] The electron gun for color cathode ray tubes according to claim 1, wherein a horizontal slot is formed on a surface of the both sides of the control electrode facing the acceleration electrode.
    [6" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein an elongated slot is formed on a surface of the both sides of the control electrode facing the cathode.
    [7" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein a horizontal slot is formed on a surface of the both sides of the control electrode facing the acceleration electrode, and a vertical slot is formed on a surface of the both sides of the control electrode opposite to the control electrode. .
    [8" claim-type="Currently amended] The electron gun for a color cathode ray tube according to claim 1, wherein an elongated slot is formed on a surface of the control electrode opposite to the connection electrode, and a horizontal slot is formed on a surface of the focusing electrode opposite to the acceleration electrode. .
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    同族专利:
    公开号 | 公开日
    KR100232156B1|1999-12-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-31|Application filed by 구자홍, 엘지전자 주식회사
    1996-12-31|Priority to KR1019960079279A
    1998-10-07|Publication of KR19980059932A
    1999-12-01|Application granted
    1999-12-01|Publication of KR100232156B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960079279A|KR100232156B1|1996-12-31|1996-12-31|Electron gun for color crt|
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