• 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:
    A ferrite core of a magnetic field deflection device for a cathode ray tube for correcting a screen error. The ferrite core is positioned between 0 degrees and 45 degrees with respect to the horizontal axis of the ferrite core, and is symmetrical with respect to the central axis. By forming a plurality of incision grooves located therein, it does not affect the distortion error and the misconvergence error at 3 o'clock, but only the misconvergence error at the 12 o'clock and 2 o'clock, It can effectively correct the amount of misconvergence at 12 o'clock and 2 o'clock, which was difficult to correct with the coil alone.
    公开号:KR19990032837A
    申请号:KR1019970054002
    申请日:1997-10-21
    公开日:1999-05-15
    发明作者:이재황
    申请人:구자홍；엘지전자 주식회사；
    IPC主号:
    专利说明:

    Ferrite Core of Magnetic Field Deflection Device for Cathode Ray Tube
    The present invention relates to a magnetic field deflection device for cathode ray tubes, and more particularly, to a ferrite core of a magnetic field deflection device for cathode ray tubes for correcting a screen error.
    In general, a cathode ray tube (CRT), which is a display device for a TV or a computer, deflects three electron beams from an electron gun to a desired position on a screen by a magnetic field so that an image is displayed by emitting phosphors painted on the surface of the screen.
    Here, a magnetic field for deflecting electrons is generated by a deflection yoke, which is a magnetic field deflection device.
    Figure 1a is a side view showing a general deflection yoke, Figure 1b is a plan view showing the deflection yoke of Figure 1a, as shown in Figures 1a and 1b, the deflection yoke is basically a horizontal deflection coil (1), a vertical deflection coil (2), ferrite core (3), plastic resin (4), and if necessary, a magnetic material or a circuit for additional correction may be added.
    The horizontal deflection of the electron beam is made by the magnetic field generated by the horizontal deflection coil 1, and the vertical deflection of the electron beam is made by the magnetic field generated by the vertical deflection coil 2.
    And, the ferrite core 3 serves to collect and strengthen the magnetic field generated by these coils, the plastic resin 4 serves to support these components.
    In general, in order to realize a desired image without error on the screen of the cathode ray tube with an electron beam passing through a uniform horizontal and vertical magnetic field, it is necessary to compensate for distortion error in which the screen is distorted and misconvergence error in which colors are not properly implemented.
    Distortion error is a screen error that occurs when the screen of the cathode ray tube is enlarged and flattened. As shown in FIG. 2A, the distortion is called concave distortion, and the image is convex as shown in FIG. 2B. This is called convex distortion, and in general, the enlargement and flattening of the screen cause a concave distortion error.
    In order to correct this distortion error, the position of the coil for each cross section of the deflection yoke is adjusted so that the distribution of the magnetic field is appropriately modified according to the cross section position of the deflection yoke.
    That is, by making the horizontal or vertical magnetic field convex, as shown in FIGS. 3A and 4A, or by making the horizontal or vertical magnetic field convex, as shown in FIGS. 3B and 4B, and placing it appropriately on each cross section of the deflection yoke. Distortion errors can be corrected.
    In the actual deflection yoke design, the correction of the vertical distortion (horizontal distortion) is solved by the deflection yoke magnetic field, and the correction of the horizontal distortion (vertical distortion) is performed by the waveform of the current input to the horizontal deflection coil of the deflection yoke in the circuit. Solve by adjusting.
    On the other hand, misconvergence error occurs when three electron beams for emitting red, green, and blue phosphors emitted from the electron gun are not collected at a desired position on the screen, and a typical example thereof is shown in FIG. 5.
    In FIG. 5, a means red, b means green, and c means blue. As shown in FIG. 5, it can be seen that the electron beams of red, green, and blue are not collected at the same position.
    This misconvergence error is corrected in the same manner as the distortion error described above.
    That is, the problem is solved by appropriately combining the shapes of the magnetic fields according to the cross-sectional positions of the horizontal and vertical magnetic fields in a concave or convex shape.
    However, the distribution of the concave or convex magnetic field according to the cross-sectional position of the magnetic field has the same effect on the distortion and misconvergence. Therefore, it is limited to simultaneously correct the two screen errors only by the coil distribution of the deflection yoke. have.
    That is, as shown in Figure 5, the misconvergence of the 3 o'clock position is not a big problem for the correction, but if you try to correct the misconvergence of the 12 o'clock and 2 o'clock directions This will affect the version.
    In general, the distortion error of the screen is more affected by the magnetic field of the deflection yoke than the magnetic field of the deflection yoke, and the misconvergence error is caused by the magnetic field of the deflection yoke rather than the magnetic field of the deflection yoke. It is relatively largely affected.
    Therefore, if you want to correct only the misconvergence while maintaining the shape of the screen, you only need to adjust the electromagnetic field side rather than the screen side field of the deflection yoke.
    However, the magnetic field adjustment of the deflection yoke is mainly performed by adjusting the coil distribution on the screen side. However, the magnetic field adjustment of the deflection yoke on the electron gun side has a very small radius on the electron gun side and very little spatial margin in which the coil is distributed. Uneasy.
    The conventional magnetic field deflecting device for cathode ray tubes has the following problems.
    Distortion error can be adjusted by adjusting the coil distribution, but misconvergence error is difficult to adjust, so it is difficult to correct the screen error only by the coil distribution of the deflection yoke.
    SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide a ferrite core of a magnetic field deflecting device for a cathode ray tube capable of correcting a misconvergence error that is difficult to correct only by a coil without affecting distortion.
    1A is a side view showing a general deflection yoke
    FIG. 1B is a plan view showing the deflection yoke of FIG. 1A
    2a and 2b are views showing the appearance of the screen caused by the distortion error
    3a, 3b and 4a, 4b show the distribution of the magnetic field according to the cross-sectional position of the deflection yoke
    5 is a view showing an implementation of color represented by misconvergence error;
    6 is a plan view of a deflection yoke to which a ferrite core is applied according to the present invention.
    7 is a perspective view showing a ferrite core according to the first embodiment of the present invention
    8 is a graph showing a change in the screen error according to the position of the incision groove of the ferrite core
    9 is a perspective view showing a ferrite core according to a second embodiment of the present invention
    A feature of the ferrite core of the magnetic field deflecting device for a cathode ray tube according to the present invention is that a plurality of cutout grooves having a predetermined interval are formed on the outer peripheral surface of the tip of the small diameter portion of the ferrite core.
    Another feature of the invention is that the incision groove of the ferrite core is located between 0 and 45 degrees with respect to the horizontal axis of the ferrite core.
    Another feature of the present invention is that the incision groove of the ferrite core achieves axis symmetry with respect to the central axis of the ferrite core.
    Referring to the accompanying ferrite core of the magnetic field deflecting device for cathode ray tubes according to the present invention having the characteristics as described above as follows.
    The present invention utilizes the property of ferrite cores to focus and strengthen the magnetic field generated from the coil of the deflection yoke, and the ferrite core serves to further strengthen the magnetic field generated from the coil.
    That is, the concave magnetic field makes the stronger concave magnetic field, and the convex magnetic field makes the stronger convex magnetic field.
    The reinforcing role of the magnetic field is possible because the ferrite core is formed in the form of a perfect circle. If the ferrite core is empty by the width e at the position of the angle f in the circumference of the ferrite core, as shown in FIG. The reinforcing role is somewhat less effective.
    Therefore, the present invention aims to adjust the misconvergence error by reducing the magnetic field reinforcing role of the ferrite core by cutting a specific position in the circumference of the electron gun side of the ferrite core using the above principle.
    7 is a perspective view showing a ferrite core according to the first embodiment of the present invention. As shown in FIG. 7, the ferrite core is a screen portion having a larger circumference and an electron gun portion having a smaller circumference. Incision grooves having a predetermined depth and width are formed at regular intervals on the outer peripheral surface of the tip of the electron gun.
    The incision is located between 0 and 45 degrees from the horizontal axis of the ferrite core and is located in a symmetry with respect to the central axis.
    That is, two incision grooves are formed on each side of the ferrite core in a U shape.
    As such, the reason for forming the incision grooves symmetrically is to consider the quarter symmetry of the cathode ray tube screen, the incision grooves should also be formed in accordance with the symmetry.
    In order to examine the effect of the ferrite core formed with the incision groove, in the present invention, when the incision groove having a width of 1cm and a depth of 1cm is formed in the ferrite core and applied to the deflection yoke, the effect of the position angle change of the incision groove is computer simulation Learned through.
    8 is a graph showing the change of the screen error according to the position of the incision groove of the ferrite core, YBH is a misconvergence amount representing the horizontal separation of red and blue at 12 o'clock of the screen, CCV is the 2 o'clock of the screen The amount of misconvergence representing the vertical separation of red and blue in the direction, CBH is the amount of misconvergence representing the horizontal separation of red and blue in the 2 o'clock position of the screen, and the APH is the 3 o'clock of the screen. The amount of misconvergence representing the horizontal separation between red and blue.
    TRL is CCV-APH + YBH, which is a value for comprehensive evaluation of misconvergence, and T / B means vertical distortion.
    As shown in FIG. 8, it can be seen that the misconvergence of YBH, CCV, and CBH changes at 12 o'clock and 2 o'clock depending on the angle at which the incision groove on the ferrite core circumference is located.
    That is, when the incision groove is located at 0 degrees, 15 degrees, and 30 degrees with respect to the horizontal axis of the ferrite core, it affects only the misconvergence YBH, CCV, and CBH at 12 and 2 o'clock which is the most difficult to correct. It can be seen that correction is possible.
    This correction has little effect on the T / B distortion and the APH, which is a misconvergence at 3 o'clock.
    9 is a perspective view showing a ferrite core according to a second embodiment of the present invention, in place of the U-shaped cut groove as shown in FIG. 7 having a circular arc having the same radius and thickness as the ferrite core neck portions on both sides of the cut groove of FIG. Sections are attached on the outer circumferential surface of the ferrite core tip of the electron gun section at predetermined intervals.
    That is, even if the section of the same shape as the neck portion of Figure 7 is attached to the same position can achieve the same effect as the first embodiment.
    The ferrite core of the magnetic field deflecting device for cathode ray tubes according to the present invention has the following effects.
    A circumferential incision groove located at the end of the ferrite core of the ferrite core is symmetrically positioned between 0 and 45 degrees with respect to the horizontal axis of the ferrite core (X axis in FIG. 6), thereby causing distortion error and misconvergence at 3 o'clock. Since it does not affect the error, it only affects the misconvergence error at 12 o'clock and 2 o'clock, so the amount of misconvergence at 12 o'clock and 2 o'clock which is difficult to correct with conventional ferrite core and coil can be effectively corrected. have.
    Therefore, a desired image can be realized without a screen error.
    权利要求:
    Claims (7)
    [1" claim-type="Currently amended] In the magnetic field deflecting device for cathode ray tubes containing ferrite core,
    Ferrite core of the magnetic field deflecting device for a cathode ray tube, characterized in that a plurality of incision grooves having a predetermined interval is formed on the outer peripheral surface of the tip of the small diameter portion of the ferrite core.
    [2" claim-type="Currently amended] The ferrite core of a magnetic field deflecting device for a cathode ray tube according to claim 1, wherein the cutting groove is positioned between 0 degrees and 45 degrees with respect to the horizontal axis of the ferrite core.
    [3" claim-type="Currently amended] The ferrite core of a magnetic field deflecting device for a cathode ray tube according to claim 1, wherein the cutting groove has an axis symmetry with respect to a central axis of the ferrite core.
    [4" claim-type="Currently amended] The ferrite core of a magnetic field deflecting device for cathode ray tubes according to claim 1, wherein the cut groove has a U shape.
    [5" claim-type="Currently amended] The ferrite core of a magnetic field deflecting device for a cathode ray tube according to claim 1, wherein two cutout grooves are formed on each side of the ferrite core.
    [6" claim-type="Currently amended] The ferrite core of a magnetic field deflecting device for a cathode ray tube according to claim 1, wherein the cutout groove is formed at an end portion of the electron gun of the ferrite core.
    [7" claim-type="Currently amended] 2. The ferrite core of a magnetic field deflecting device for a cathode ray tube according to claim 1, wherein a plurality of pieces are attached on the outer circumferential surface of the small-diameter tip of the ferrite core to have grooves of a predetermined interval.
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    同族专利:
    公开号 | 公开日
    KR100252975B1|2000-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-10-21|Application filed by 구자홍, 엘지전자 주식회사
    1997-10-21|Priority to KR1019970054002A
    1999-05-15|Publication of KR19990032837A
    2000-04-15|Application granted
    2000-04-15|Publication of KR100252975B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970054002A|KR100252975B1|1997-10-21|1997-10-21|ferritecore of magetic deflector using CRT|
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