• 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:
    The present invention forms a larger asymmetric lens in the electron gun triode so as to be applied to a patented large-color cathode ray tube, so as to receive less aberration at the center of deflection and to prevent degradation of the electron beam spot at the periphery of the screen, thereby improving resolution. It was made. The present invention is to prevent the deterioration of the electron beam spot by forming a slot in the electrode constituting the triode and tapering the slot to deepen the penetration field.
    公开号:KR19980059931A
    申请号:KR1019960079278
    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
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a color cathode ray tube, and in particular, an asymmetric lens is formed in the electron gun triode so as to receive less aberration at the center of deflection, thereby improving the resolution of the periphery of the screen.
    In general, the color cathode ray tube is divided into a panel (1) in which the phosphor (7) of RGB tricolor is coated on the inner surface, and a funnel (2) having a tubular neck (3) as shown in FIG. And a deflection yoke 5 for deflecting the electron beam emitted from the electron gun in the horizontal or vertical direction.
    2 is a configuration of the electron gun used in the conventional color cathode ray tube, the electron gun is composed of a three-pole portion and the main lens portion, the three-pole portion control electrode for controlling the hot electrons emitted from the cathode and the negative electrode 10 with a heater (9) built-in 11 and an accelerating accelerating electrode 12, and the main lens part consists of a focusing electrode 13 and an anode 14 for focusing and finally accelerating the electron beam 8 generated at the triode.
    Here, the control electrode 11 is grounded, a voltage of 500 to 1000 V is applied to the acceleration electrode 12, a high voltage of 25 to 30 KV is applied to the anode 14, and 25 to 30 of an anode voltage is applied to the connection electrode 13. An intermediate voltage equal to% is applied.
    In the conventional electron gun configured as described above, as a predetermined potential is applied to each electrode, an electrostatic lens is formed by the voltage difference between the focusing electrode 13 and the anode 14, and the electron beam 8 generated at the triode is shadowed. It passes through the mask 6 and is focused in the center of the fluorescent screen 7.
    At this time, the flat yoke 5 serves to flatten the electron beam focused at the center of the fluorescent screen to the entire area of the screen. In order to converge the three electron beams to one of the fluorescent surfaces 7, a self-convergence deflection yoke using a non-uniform magnetic field is applied.
    The magnetic field distribution of the self-convergence deflection yoke as shown in FIGS. 3A and 3B has a horizontal deflection magnetic field having a pincushion type and a vertical deflection magnetic field having a barrel type dislocation. (Mis-convergence) can be prevented.
    On the other hand, as shown in FIGS. 3C and 3D, when the magnetic field is separated into a bipolar component and a quadrupole component, the bipolar component serves to deflect the electron beam in the horizontal and vertical directions, and the quadrupole component produces the electron beam. It focuses in the vertical direction and diverges in the horizontal direction, thereby distorting the electron beam spot causing astigmatism.
    Even though the magnetic field is close to uniform, the electron beam is subjected to significant astigmatism at the periphery of the fluorescent surface due to the fine pincushion or barrel magnetic field component. Thus, the distortion of the electron beam spot is specifically illustrated in FIG. 4.
    That is, since the deflection field is not applied in the center of the screen as shown in FIG. Core (16) and Haze (17), which is a phenomenon of low-density spreading up and down, are generated, which results in deterioration of resolution, especially at the periphery of the screen.
    The above problem is that the larger the water tube is larger, the larger the deflection angle becomes larger.
    In addition, the above-mentioned spreading phenomenon in the periphery of the screen is caused by receiving a lot of deflection aberration at the center of the deflection yoke, and the divergence of the horizontal deflection magnetic field at the deflection center and the focusing force due to the distance difference are canceled. On the other hand, it is preferable to adjust the electron beam at the triode in order to reduce the haze of the peripheral portion generated by overlapping the focusing force due to the aberration and the focusing force due to the distance difference in the vertical direction.
    That is, an asymmetric tripole is formed by forming a slot in at least one of the electrodes constituting the tripole, so that the electron beam formed in the tripole receives less deflection aberration when passing through the deflection center.
    5 to 7 are views showing a prior art for constructing an asymmetric tripolar portion, wherein the conventional tripolar portion forms a slot 11b in the vertical direction of the electron beam passage hole 11a in the control electrode 11 in a horizontal direction. The slot 11c is formed finely or hardly. On the other hand, in the accelerating electrode 12, the slot 12c is formed in the horizontal direction of the electron beam through hole 12a, and the slot 12b is perpendicularly formed. It is made of a structure that forms a fine or rarely.
    As described above, the conventional asymmetric tripolar section has a slot shape formed in the electrode to lateralize the electron beam generated at the triode as much as possible, that is, the electron beam receives less deflection aberration at the deflection center, thereby improving resolution degradation at the periphery of the screen. .
    However, the slot shape as described above has a limitation in improving the shape of the electron beam spot due to the limitation of the depth, and thus, when applied to a large screen, the effect is insufficient.
    The present invention is to provide an electron gun for a color cathode ray tube that can be applied to a large color cathode ray tube or the like to more effectively prevent the resolution degradation due to deflection aberration in the periphery of the screen.
    According to an embodiment of the present invention for achieving the above object is provided an electron gun for a color cathode ray tube formed with a slot in the electrode constituting the triode and tapered in the slot.
    1 is a schematic configuration diagram of a general color cathode ray tube
    2 is a configuration diagram of a conventional inline electron gun
    3 is a magnetic field distribution diagram generated from a deflection yoke of an electron gun to which a self-convergence deflection yoke is applied;
    4 is an electron beam spot shape diagram in each part of the screen;
    5 is a cross-sectional view of a triode of a conventional electron gun
    6 is a perspective view of a control electrode of a conventional electron gun
    7 is a perspective view of an acceleration electrode of a conventional electron gun
    8 is a cross-sectional view showing a control electrode and an acceleration electrode of a conventional electron gun with a perspective view FIG. 9 is a cross-sectional view showing a control electrode and an acceleration electrode of an electron gun according to the present invention with a perspective view
    9 is a cross-sectional view illustrating a control electrode and an acceleration electrode of the electron gun according to the present invention.
    10 is an electron beam observation before the main lens incident in the conventional electron gun
    11 is an electron beam shape formed by the triode in the electron gun of the present invention
    12 is a block diagram of a taper according to the present invention
    Explanation of symbols for main parts of the drawings
    11: control electrode 11b, 11c: slot
    12d: taper 12: acceleration electrode
    12b, 12c: Slot 12d: Taper
    The basic configuration of the electron gun of the present invention includes a plurality of cathodes 10, a control electrode 11, an acceleration electrode 12, a focusing electrode 13, and both sides 14 in which a heater 9 is embedded.
    As shown in FIG. 9, a slot 11b is formed in the control electrode 11 in the vertical direction of the electron beam through-hole 11a, and a taper 11d is formed in the pore surface at the boundary between the slot and the electron beam through-hole.
    On the other hand, the acceleration electrode 12 is formed with a slot 12c elongated in the horizontal direction of the electron beam through hole 12a, and a taper 12d is also formed in the gap surface between the slot and the electron beam through hole boundary.
    The reason for forming the slots in the control electrode and the acceleration electrode as described above is to horizontally lengthen the electron beam as described above, and as a result of observing the electron beam at the point P before being incident on the main lens as shown in FIG. It was confirmed that it became horizontal.
    When the taper is formed in the slot as in the present invention, as shown in FIG. 11, the penetration field of the accelerating electrode 12 and the focusing electrode 13 penetrates more deeply in the direction of the control electrode or the cathode, particularly in the horizontal direction of the electron beam. Done.
    Due to this the electron beam is more divergent and, in some cases 0 ° by the angle of the taper, such as 12 and acts as a t 2 90 degrees when it acts as a t 1 is the depth of the slot by a role, such as t 1 further deepening You will get the effect.
    In addition, the deeper the depth of the penetrating electric field due to the voltage of the accelerating electrode and the focusing electrode, the more active electron beams are drawn out from the cathode.
    On the other hand, in the color cathode ray tube used as an industrial monitor, when the electron beam is kept constant, the same current can be emitted only by keeping the distance between the cathode and the control electrode.
    Of course, if the distance between the cathode and the control electrode is too far, the capacitance between the cathode and the control electrode increases, which causes a problem of reducing the bandwidth of the TV. On the contrary, if the distance between the cathode and the control electrode is too close, thermal activation is not possible. It causes a lot of problems.
    In the case of a monitor requiring a high resolution rule, the trend of using a control electrode hole (diameter of electron beam through hole) up to 0.35 mm is used recently, and the distance between the cathode and the control electrode is usually 80 to 90 μm (before heat activation). In the heat activation process of the cathode ray tube, the cathode expands by about 65 to 75 μm.
    Therefore, the contact between the cathode and the control electrode is generated to hinder the electrical characteristics of the cathode ray tube, and it is necessary to widen the gap between the cathode and the control electrode to prevent such a phenomenon.
    As in the embodiment of the present invention, when the taper 11d is formed in the slot 11b portion of the control electrode 11 or the taper 12d is formed in the slot 12c portion of the acceleration electrode 12, the cathode And the distance between the control electrode can be designed to about 100 ~ 110㎛.
    In more detail, the formula for obtaining the cathode current,
    Where ik is the cathode current, Ekco is the cathode voltage at which no electron beam is emitted, k is the correlation coefficient, d1 is the distance between the cathode and the control electrode, d2 is the distance between the control and acceleration electrodes, t is the thickness of the control electrode, and Ec2 is Based on the accelerating electrode voltage), the penetrating electric field is deepened by the taper formed on the control electrode and the accelerating electrode, thereby increasing the cathode current ik.
    In addition, when the cathode current increases, the electron beam does not come out and the cathode voltage (Ekco) increases. In the chassis of the TV or monitor, the cathode voltage where the electron beam does not come out should be kept together. The distance d1 between the electrodes can be widened.
    The present invention can form a deeper penetrating electric field by forming a taper on the control electrode or the acceleration electrode, so that a larger asymmetric tripolar portion can be formed than a conventional electrode without taper, and thus, when applied to a large color cathode ray tube, deflection at the periphery of the screen It is possible to effectively prevent resolution deterioration due to aberration and to improve resolution.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] A plurality of cathodes comprising a plurality of cathodes for emitting electron beams, a control electrode for controlling the radiation amount of the electron beams, and an accelerating acceleration electrode, and a plurality of focusing electrodes and acceleration electrodes constituting a capacitive focusing lens to focus the electron beams on the screen In the electron gun for a color cathode ray tube consisting of a plurality of cathodes and a plurality of electrodes are spaced apart from each other by a predetermined interval and a long slot in the vertical direction on the opposite surface of the acceleration electrode of the two sides of the control electrode constituting the tripolar portion, An electron gun for a color cathode ray tube, wherein a taper is formed at a boundary between a rectangular electron beam passing hole of the control electrode and a vertical slot.
    [2" claim-type="Currently amended] A plurality of cathodes comprising a plurality of cathodes for emitting electron beams, a control electrode for controlling the radiation amount of the electron beams, and an accelerating acceleration electrode, and a plurality of focusing electrodes and acceleration electrodes constituting a capacitive focusing lens to focus the electron beams on the screen In the electron gun for a color cathode ray tube consisting of a plurality of cathodes and a plurality of electrodes are spaced apart from each other by a predetermined interval and a long slot in the horizontal direction on the opposite surface of the focusing electrode of the acceleration electrode constituting the tripolar portion, An electron gun for a color cathode ray tube, wherein a taper is formed at a boundary between a rectangular electron beam passing hole of the control electrode and a horizontal slot.
    [3" claim-type="Currently amended] A plurality of cathodes comprising a plurality of cathodes emitting an electron beam, a control electrode for controlling the radiation amount of the electron beam, and an accelerating acceleration electrode, and a plurality of focusing electrodes and acceleration electrodes constituting a capacitive focusing lens to focus the electron beam on a screen. And a plurality of cathodes and a plurality of electrodes are spaced apart from each other by a predetermined distance, and long slots are formed in the vertical direction on the opposite surface of the acceleration electrode of both sides of the control electrode constituting the tripolar portion, In an electron gun for a color cathode ray tube having a long slot in a horizontal direction on an electrode opposing surface, a taper is formed at a boundary between a rectangular electron beam through hole and a vertical slot in the control electrode, and a square electron beam through hole and a horizontal direction in the acceleration electrode. Characterized in that the taper is formed at the boundary of the slot Electron gun for color cathode ray tube to say.
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    同族专利:
    公开号 | 公开日
    KR100205420B1|1999-07-01|
    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 KR1019960079278A
    1998-10-07|Publication of KR19980059931A
    1999-07-01|Application granted
    1999-07-01|Publication of KR100205420B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960079278A|KR100205420B1|1996-12-31|1996-12-31|An electron gun for a color crt|
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