• 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 improves the resolution at the periphery of the screen by improving the shape of the central hole of the opposing portion of the first focusing electrode and the second focusing electrode to correct the astigmatism according to the deflection amount of the electron beam, and at the same time improve the electrode alignment characteristics. Provide an electron gun for color cathode ray tubes. According to the present invention, a plurality of focusing electrodes forming a cathode including a cathode having a heater radiating an electron beam, a control electrode for adjusting the radiation amount of the electron beam, and an acceleration electrode, and a capacitive focusing lens for focusing the electron beam; And a plurality of focusing electrodes including a first focusing electrode to which a fixed voltage is applied, and a second focusing electrode to which a variable voltage is changed in accordance with an electron beam deflection amount. In the electron gun for a color cathode ray tube, in which three independent electron beam through holes are formed at opposite portions of the focusing electrode, The central hole on one side of the opposing portions of the first focusing electrode and the second focusing electrode is circular, and the other central hole opposite to the first focusing electrode has a shape in which a circular hole having a diameter larger than the horizontal width of the square is coupled to the middle of the longitudinal rectangle. The other central hole has a larger vertical width than the outer hole.
    公开号:KR20020066859A
    申请号:KR1020010007294
    申请日:2001-02-14
    公开日:2002-08-21
    发明作者:김덕수
    申请人:엘지전자주식회사；
    IPC主号:
    专利说明:

    Electron Gun for Color Cathode Ray Tube {Electron Gun For Color Cathode Ray Tube}
    [21] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a color cathode ray tube, and more particularly, to a color cathode ray tube that can easily align the position of each electrode of the electron gun and improve the resolution of the screen periphery by correcting astigmatism according to the deflection amount of the electron beam. It's about an electron gun.
    [22] In general, the color cathode ray tube includes a panel 3 having a fluorescent surface 3a coated on its inner surface, and a shadow mask 4 having a color discriminating function coupled to the inner surface of the panel 3, as shown in FIG. And an electron gun 6 mounted on the neck of the funnel 1 coupled to the rear end of the panel 3, and a deflection yoke 7 for deflecting the electron beam emitted from the electron gun.
    [23] The internal structure of the electron gun shown in FIG. 2 is composed of a triode and a main lens. The tripole includes a cathode 9 having a heater 8 therein for emitting electrons, and controlling hot electrons emitted from the cathode 9. The main lens includes a first focusing electrode 12 which is an electrode to which a fixed voltage is applied to focus the electron beam generated at the triode, and a variable voltage is applied to the main lens. It consists of a two focusing electrode 13 and an anode electrode 14 which are fixed by the bead glass 16.
    [24] Here, the control electrode 10 is grounded, a high voltage of 500-1000V is applied to the acceleration electrode 11, 25-35KV is applied to the anode electrode, and a middle of 20-30% of the anode electrode voltage is applied to the second focusing electrode 13. Voltage is applied.
    [25] In the conventional color cathode ray tube electron gun configured as described above, as a predetermined potential is applied to each electrode, an electrostatic lens is formed by a voltage difference between the second focusing electrode 13 and the anode electrode 14, thereby being generated at the triode. The electron beam is focused at the center of the fluorescent surface. At this time, the deflection yoke 7 attached to the funnel 5 acts to deflect the electron beam focused at the center of the fluorescent screen to the entire screen area.
    [26] In a color cathode ray tube using an inline electron gun, since three electron beams of red, green, and blue are arranged side by side horizontally, the deflection yoke (7) is a self-concentrating type using a non-uniform magnetic field in order to converge the three electron beams on one side of the fluorescent surface. Is applying.
    [27] The magnetic field generated in the deflection yoke 7 to which the self-focusing type is applied has a horizontal deflection magnetic field as a pincushion type and a vertical deflection magnetic field as a barrel type to prevent deviation of concentration on the fluorescent surface. In addition, the magnetic field can be separated into a two-pole component and a four-pole component, the two-pole component serves to deflect the electron beam in the horizontal and vertical direction, the four-pole component focuses the electron beam in the vertical direction and in the horizontal direction By dissipating generates astigmatism and distorts the electron beam spot.
    [28] Although the magnetic field is almost uniform, the pin spot or barrel magnetic component causes distortion of the beam spot at the periphery of the fluorescent surface due to significant astigmatism. That is, the electron beam spot has an accurate shape because no deflection magnetic field is applied at the center of the screen, but at the periphery thereof, a high density horizontal core which is dissipated in the horizontal direction and overconcentrated and distorted in the vertical direction, and a low density upper and lower spreading phenomenon The occurrence of in haze causes the resolution to deteriorate, especially in the periphery of the screen.
    [29] In order to solve the above problems, a number of methods for correcting astigmatism in synchronism with a deflection signal when the electron beam is deflected to the periphery of the screen have been adopted. As the correction means, the focusing electrode is divided into two and the first focusing electrode and the second Astigmatism is corrected by forming a focusing electrode and forming a 4-pole lens by providing a 4-pole electrode between them.
    [30] The averaging correction means of the conventional embodiment will be briefly described with reference to the accompanying drawings.
    [31] 3 is a cross-sectional view illustrating a conventional first focusing electrode 20 and a second focusing electrode 30.
    [32] The second focusing electrode 30 faces the anode electrode 14 and the first focusing electrode 20 faces the second focusing electrode 30. The second focusing electrode side facing part 200 of the first focusing electrode 20 has electron beam through holes 201, 202, and 203 formed by overlapping circular holes having a diameter larger than the horizontal width of the rectangular hole in the middle of the longitudinal rectangular hole. This is pierced.
    [33] In addition, the first focusing electrode side facing part 300 of the second focusing electrode 30 has electron beam through holes 301, 302, and 303 formed by overlapping circular holes having a diameter larger than the vertical width of the rectangular holes in the middle of the horizontal rectangular hole. ) Is open. Also, inner electrodes 21 and 31 are formed in the first focusing electrode and the second focusing electrode to support the focusing electrode and have three circular electron beam passing holes.
    [34] The movement process of the electron beam of the conventional electron gun having the above configuration is as follows.
    [35] The electron beam generated in the triode passes through the first and second focused electrodes divided into two as shown in FIG. 4, and in particular, the quadrupole electrode parts 201, 202, 203 and the second focused electrode side. It passes through the electrodes 301, 302, 303 and is focused on the main lens and forms an image on the screen. In particular, when the electron beam is deflected to the periphery of the screen, the first focusing electrode voltage is fixedly operated, but the second focusing electrode voltage changes according to the amount of deflection of the electron beam.
    [36] That is, the quadrupole lens is operated. In general, the larger the CRT or the larger the deflection angle, the higher the second focusing electrode voltage becomes than the first focusing electrode voltage.
    [37] Due to the difference in the second focusing electrode voltage, the quadrupole lens operates to change the shape of the electron beam into an elongated shape, and improves the haze of the peripheral portion generated by the non-uniform magnetic field of the deflection yoke through the main lens.
    [38] FIG. 5A is an explanation of astigmatism and beam trajectory caused by deflection yoke when the electron beam is not deflected, that is, at the center of the screen, almost exactly in the horizontal / vertical direction, but is deflected to the periphery. The deflection yoke diverges the electron beam in the horizontal direction and focuses in the vertical direction. When the electron beam is deflected to the periphery, the over-focusing component due to the distance difference and the under focusing component due to the deflection yoke cancel each other in the horizontal direction. Although it shows the correct focusing state, in the vertical direction, the over-focusing component due to the distance difference and the over-focusing component in the vertical direction of the deflection yoke overlap, resulting in a severe over-focusing shape. The spreading phenomenon in the direction is severe, resulting in a degradation of the peripheral resolution.
    [39] 5B is an explanatory diagram when a four-pole electrode is applied to improve such a phenomenon of spreading. The deflection yoke astigmatism caused by the quadrupole is compensated for with the same focusing force of the main lens. The quadrupole lens focuses in the horizontal direction by the horizontal divergence of the deflection yoke, and the quadrupole lens diverges in the vertical direction by the amount of focus in the vertical direction of the deflection yoke.
    [40] In FIG. 6, the reason for focusing in the horizontal direction of the electron beam and the reason for diverging in the vertical direction is illustrated. The electric field of the electron beam passing hole is formed by the potential difference between the first focusing electrode 20 and the second focusing electrode 30, focuses in the horizontal direction, diverges in the vertical direction, and forms an electron beam in an elongated shape.
    [41] In order to prevent the flow of each electrode in the process of embedding in the bead glass 16 of the conventional electron gun is to pass through the alignment pin 15 that can be supported slightly smaller than the electron beam through hole is embedded in the bead glass. However, if the pin 15 passes through the electron beam passing holes of the first focusing electrode and the second focusing electrode as described above, the first focusing electrode can flow due to the circular shape in the horizontal direction. There is no margin, but in the vertical direction there is no part where the pin is supported so that it flows in the vertical direction. Similarly, in the second focusing electrode, the pin is not supported in the horizontal direction and flows, so that the electrode flows left and right or up and down in the process of embedding the electron gun in the bead glass, thereby changing the path of the passage hole of the electron beam.
    [42] If the alignment is not properly as described above, as shown in FIG. 7, this phenomenon causes a unilateral phenomenon in which the electron beam is directed to one side. This one-sided phenomenon has a problem that the quality of the screen is deteriorated, so that when the screen is viewed, the focus is not well formed, and the blurring is seen.
    [43] The present invention has been made to solve the above-mentioned problems of the prior art, the screen peripheral portion by correcting the astigmatism according to the deflection amount of the electron beam by improving the shape of the central hole of the opposite portion of the first focusing electrode and the second focusing electrode It is an object of the present invention to provide an electron gun for a color cathode ray tube that can improve the resolution at the same time and improve the electrode alignment characteristics.
    [1] 1 is a cross-sectional view showing a schematic configuration of a conventional color cathode ray tube.
    [2] 2 is a cross-sectional view showing a schematic configuration of an electron gun employed in a conventional color cathode ray tube.
    [3] 3 is a cross-sectional view showing a first focusing electrode and a second focusing electrode in a conventional electron gun;
    [4] 4A and 4B are plan views showing opposing portions of a first focusing electrode and a second focusing electrode of a conventional electron gun;
    [5] 5A and 5B are illustrations showing the principle when the electron beam is deflected and corrected by the quadrupole electrode;
    [6] 6 is an exemplary view showing the electric field effect by the first focusing electrode and the second focusing electrode in the conventional electron gun;
    [7] 7 is an exemplary view showing a lateral phenomenon due to deflection of a conventional electron beam.
    [8] 8 is a cross-sectional view showing a first focusing electrode and a second focusing electrode of an electron gun according to the present invention;
    [9] 9A and 9B are plan views showing opposing portions of the first focusing electrode and the second focusing electrode of the electron gun according to the present invention;
    [10] 10 is an exemplary view showing an improved field effect by the first focusing electrode and the second focusing electrode of the electron gun according to the present invention;
    [11] ** Description of symbols for the main parts of the drawing **
    [12] 1: Funnel 3: Panel
    [13] 4: shadow mask 6: electron gun
    [14] 7: deflection yoke 8: heater
    [15] 9: cathode 14: anode electrode
    [16] 15: alignment pin 16: bead glass
    [17] 80: first focusing electrode 81: inner electrode of the first focusing electrode
    [18] 800: opposing part of the second focusing electrode side of the first focusing electrode
    [19] 90: second focusing electrode 91: inner electrode of second focusing electrode
    [20] 900: opposing part of the first focusing electrode side of the second focusing electrode
    [44] In order to solve the above object, the present invention provides a cathode including a heater having a built-in heater emitting an electron beam, a tripole portion including a control electrode and an acceleration electrode for adjusting the radiation amount of the electron beam, and a main electrostatic focusing lens for focusing the electron beam. And a plurality of focusing electrodes, the plurality of focusing electrodes including a first focusing electrode to which a fixed voltage is applied, and a second focusing electrode to which a variable voltage varies according to an electron beam deflection amount. In the electron gun for color cathode ray tube, in which three independent electron beam passing holes are formed at opposite portions of the first focusing electrode and the second focusing electrode,
    [45] The central hole on one side of the opposing portions 800 and 900 of the first focusing electrode 80 and the second focusing electrode 90 is circular, and the central hole on the other side opposite thereto is the square in the middle of the longitudinal rectangle. The circular hole of a diameter wider than the horizontal width of the combined form, the central hole of the other side is made of a larger vertical width than the outer hole.
    [46] The structure of this invention is demonstrated in detail, referring an accompanying drawing. For reference, prior to the description of the present invention, in order to avoid duplication of description, the same reference numerals as those of the prior art will be referred to.
    [47] The schematic configuration of the electron gun according to the present invention is almost identical to the conventional electron gun, and thus a detailed description thereof will be replaced with the description of the prior art. Hereinafter, a first focusing electrode and a second focusing electrode which are main parts of the present invention will be described.
    [48] 8 illustrates a cross-sectional structure of the first focusing electrode 80 and the second focusing electrode 90 according to the present invention, wherein the first focusing electrode 80 and the second focusing electrode 90 are spaced apart from each other by a predetermined interval. Although not shown, the anode is positioned opposite to the opposite side of the second focusing electrode 90.
    [49] An inner electrode 81 serving as an electrostatic field control electrode is provided in the first focusing electrode 80, and an inner electrode 91 serving as a capacitive control electrode in the second focusing electrode 90. ) Is provided.
    [50] Each of the inner electrodes 81 and 91 is formed with independent circular holes to allow three electron beams to pass therethrough.
    [51] 9A and 9B illustrate, in plan view, a preferred embodiment of the opposing portion 800 of the first focusing electrode 80 and the opposing portion 900 of the second focusing electrode according to the present invention.
    [52] Referring to FIG. 9A, although not illustrated, the second focusing electrode 90 is opposed to the anode electrode 14, and three electron beam passing holes 901 are provided in the opposing portion 900 opposite to the first focusing electrode. 902 and 903 are formed. The left and right outer holes 901 and 903 of the electron beam through holes are formed by combining a circular hole having a diameter larger than the vertical width of the rectangle in the middle of a wide horizontal rectangular hole, and the central electron beam through hole 902 is a simple circle. Consists of
    [53] Referring to FIG. 9B, which illustrates a plane of the first focusing electrode 80, the left and right outer holes 801 and 803 couple circular holes having a diameter larger than the horizontal width of the rectangle in the middle of a vertical rectangular hole having a wide vertical width. The central electron beam through hole 802 has a rectangular hole having a longer vertical width than the outer hole.
    [54] That is, the outer electron beam through holes 901 and 903 of the second focusing electrode 90 have a shape in which a circular hole is coupled in the middle of the horizontal rectangular shape, and the outer electron beam through holes 801 of the first focusing electrode 80 ( 803 is a circular hole in the middle of the elongated rectangle.
    [55] A characteristic feature of the above configuration is that the vertical width of the central hole of the first focusing electrode is at least larger than the vertical width of the outer hole.
    [56] The vertical width of the quadrangle of the central electron beam through hole of the first focusing electrode was increased to maintain the effect of the existing dynamic quadrupole while configuring the central electron beam through hole 902 of the second focusing electrode in a circular shape. By doing this, you can enjoy the same effect of the existing quadrupole.
    [57] By making the central electron beam through-hole of the second focusing electrode circular, it is possible to completely eliminate the left, right, left, and right flows of the electrode, which may occur when the electrodes are embedded in the bead glass 16. Therefore, by changing the shape of the electron beam passing holes of the first focusing electrode and the second focusing electrode, it is possible to completely solve the unilateral phenomenon caused by the assembling anxiety of the electron gun.
    [58] The present invention can improve the alignment characteristics for aligning the electrodes in the uniaxial direction while preventing the flow of the electrode when the electrode is embedded in the bead glass when manufacturing the electron gun, and at the same time can enjoy the effect of the existing quadrupole By selecting the structure, it has a stable supporting structure of the electrode, and can effectively eliminate the unilateral phenomenon caused by the unstable assembly of the electron gun electrode on the screen.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] A cathode comprising a cathode having a heater radiating an electron beam, a control electrode for adjusting the radiation amount of the electron beam, and an accelerating electrode; a plurality of focusing electrodes for forming a capacitive focusing lens for focusing the electron beam; The plurality of focusing electrodes may include a first focusing electrode to which a fixed voltage is applied, and a second focusing electrode to which a variable voltage is changed according to an electron beam deflection amount, wherein the plurality of focusing electrodes of the first focusing electrode and the second focusing electrode are included. In the electron gun for the color cathode ray tube, each of the three opposite electron beam through-holes is formed in the opposing portion,
    The central hole on one side of the opposing portions of the first focusing electrode and the second focusing electrode is circular, and the other central hole opposite to the first focusing electrode has a shape in which a circular hole having a diameter larger than the horizontal width of the square is coupled to the middle of the longitudinal rectangle. The center hole on the other side of the electron gun for the color cathode ray tube, characterized in that the vertical width is larger than the outer hole.
    [2" claim-type="Currently amended] The method of claim 1,
    The outer electron beam passing hole of the opposite side of the first focusing electrode and the second focusing electrode has a shape in which a circular hole having a diameter larger than the short side width of the rectangle is coupled to a middle of the rectangular rectangle.
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The electron beam passing hole of the outer side of the opposite side of the first focusing electrode has a shape in which a circular hole is coupled to a middle of an elongated quadrangle.
    [4" claim-type="Currently amended] The method according to claim 1 or 2,
    The electron beam passing hole outside the opposite side of the second focusing electrode has a shape in which a circular hole is coupled to a middle of a horizontal rectangular shape.
    [5" claim-type="Currently amended] The method of claim 1,
    The electron gun for the color cathode ray tube, characterized in that the diameter of the circular in the electron beam through hole of the first focusing electrode and the second focusing electrode opposing portion are all the same.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-02-14|Application filed by 엘지전자주식회사
    2001-02-14|Priority to KR1020010007294A
    2002-08-21|Publication of KR20020066859A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020010007294A|KR20020066859A|2001-02-14|2001-02-14|Electron gun for color cathode ray tube|
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