• 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 coils 20, 21 of the astigmatism corrector 13 for the electron beam 12 of the cathode ray tube 6 are positioned on the flexible support 40. This flexible support is disposed around the neck 8 of the cathode ray tube, so as to reduce the interaction of the elements of the electron gun 7 with the magnetic field provided by the astigmatism corrector 13, at least one pair of deflection coils ( It is positioned at least partially adjacent to the rear part of 3, 4).
    公开号:KR20000049077A
    申请号:KR1019990703152
    申请日:1997-10-13
    公开日:2000-07-25
    发明作者:페르라우트장마르크；루이쉘브루노
    申请人:데니스 에이취 엘 벡；톰슨 튜브 앤드 디스플레이 에스. 에이.；
    IPC主号:
    专利说明:

    Electron beam deflection system for cathode ray tube {ELECTRON BEAM DEFLECTION SYSTEM FOR CATHODE RAY TUBES}
    In cathode ray tubes, deflection devices called deflectors are used to deflect an electron beam incident from an electron gun to scan the entire surface of the cathode ray tube to produce a desired image on the screen. It is becoming.
    If the screen surface is not spherical, or if the radius of the spherical screen is substantially greater than the distance from the center of the deflection to the screen, then the uniform deflection magnetic field will be substantially flatter than the surface of the screen. It is known to generate a defective image. It is also known to modify the frame and line deflection magnetic fields of the deflector so as to astigmatically deflect these defects in order to correct these cosmetic defects in whole or in part.
    However, the non-point deflecting magnetic field is accompanied by distortion (luminous halo extending around the center spot along one direction), although the collision point of the electron beam on the screen, called spot, is not circulated. It affects the operation according to the focusing of the electron beam.
    In particular, since such distortion interferes with image clarity, it is necessary to correct the distortion for all applications requiring high resolution.
    The astigmatism correction device according to the prior art comprises a pair of coils that can be wound around a ring core of ferromagnetic material and partly or wholly disposed around the electron gun at the rear portion of the deflector.
    Such a conventional device suffers from new limitations due to high scan frequencies, for example 64 kHz or higher applied to the deflector. In fact, when the astigmatism correction device is arranged around the metal part of the electron gun at the rear part of the deflector, these rear parts operate at a high frequency which impedes the magnetic field generated by the correction device. This disturbance results in a delay in the setting of the self-correcting magnetic field appearing on the screen as a phase error that cannot be sufficiently corrected.
    As a solution to this problem, the astigmatism correcting apparatus extends the neck of the cathode ray tube without using the electron gun described above. This solution is not feasible because it requires a display that reduces depth.
    In order to solve this problem, the electron beam deflection system for a cathode ray tube according to the present invention,
    A pair of saddle-shaped horizontal deflection coils, a pair of vertical deflection coils, at least one pair of deflection coils arranged to insulate the two deflection coil pairs generating a non-point deflection magnetic field from each other, and a magnetic field generated by the deflection coils. A deflector composed of a ring core made of ferromagnetic material for concentrating;
    A deflection magnetic field astigmatism corrector having a plurality of radial axis coils arranged around the neck of the cathode ray tube for generating a magnetic field operating in the shape of the electron beam,
    The astigmatism corrector is arranged at least partially around a rear portion of at least one deflection coil pair around the neck of the cathode ray tube.
    Further features and advantages of the present invention will be more clearly understood from the following detailed description with reference to the accompanying drawings.
    The present invention relates to an apparatus for correcting a non-point deflection magnetic field that affects the concentration of an electron beam generated by an electron gun of a cathode ray tube, and an electron beam deflection system for a cathode ray tube embedded in the apparatus.
    1A and 1B show the result of scanning the front face of the cathode ray tube with an electron beam in the case where the front face is spherical with respect to the case where the front face of the cathode ray tube is essentially flat in order to show the external defect of the screen to be corrected. It is a figure compared and showing.
    2 is a schematic diagram of a cathode ray tube incorporating an electromagnetic deflection device and an astigmatism corrector according to the related art.
    3 is a front view of an embodiment of the astigmatism corrector according to the prior art.
    4A, 4A ', 4B and 4B' show the results of an electromagnetic quadrupole in the shape of an electron beam.
    5 is a diagram illustrating a preferred embodiment mode of the present invention.
    6 is a cross-sectional view of an electromagnetic deflection system according to an embodiment mode of the present invention.
    The volume curved surface of the screen by electron beams incident from the electron gun of the cathode ray tube under the operation of uniform vertical and horizontal deflection magnetic fields is defined as a pyramidal surface whose surface has the deflection center O of the deflector as its pole.
    1A shows a pyramidal surface of the pole O generated by an electron beam under the operation of a vertically and horizontally deflected magnetic field with a screen 9, i.e. the front of a cathode ray tube with a spherical surface coincident with the deflection center O. FIG. The intersection of In this case, the magnetic field generated by the vertical and horizontal deflection magnetic fields is made uniform.
    In this case, each intersection is limited to the curved rectangular ABCD.
    1B shows the intersection of the same pyramidal surface under the same conditions with the screen 9 of the substantially flat front. This intersection is limited to the figure A'B'C'D 'defined by two cross hyperbolas that actually occur compared to the ideal rectangular ABCD, with the maximum amplitude perpendicular to the intersection defined by A'B'C'D'. Cosmetic defects called "pillow" or "pincushion" represented by ΔH along the Y axis and ΔL along the horizontal X axis, where H and L represent the height and width of the visual screen, respectively. There is this.
    In the case of using a boiling point or non-uniform deflection magnetic field, it is possible to compensate for the influence of the front view of the screen or the screen on which the image is formed, but such non-uniform deflection magnetic field can change the focusing of the electron beam, and this focusing is the electron gun It operates on the termination level of. The change of focus causes wide spots on the screen along the biased direction, and the dispersion of the beams is represented by halo by the spots.
    2 schematically shows a cross section of a cathode ray tube 6 with a longitudinal axis Z in which a deflector 1 is incorporated along a vertical symmetry plane.
    The deflector 1 is of known type and consists of a pair of vertical deflection coils 4, a pair of horizontal deflection coils 3 and at least one pair of coils generating a nonpoint deflection magnetic field. The pair of coils are electrically insulated with a separator 2 of strongly plastic material and are surrounded by a ring core 5 of ferromagnetic material. The horizontal deflection coils are configured in a saddle shape, and the technology of this horizontal deflection coils is formed by hot forming so that a change in the winding's strand can be carried out in a simple way, even in terms of cost and cost, to modify the shape of the deflection magnetic field. do. On the neck 8 of the cathode ray tube of the electron beam 12 generated by the astigmatism of the deflection magnetic field such that the electron beam 12 forms a circular crystal size small spot on the entire surface on the screen 9 of the cathode ray tube. It is equipped with an astigmatism corrector 11 designed to compensate for deformation. This astigmatism corrector can be arranged behind the deflector and overlap with a particular metal part of the electron gun 7.
    As shown in Figs. 2 and 3, a method of using a set of coils forming quadrupoles to correct the influence of astigmatism of a deflection magnetic field is known. Each electromagnetic quadrupole can correct the astigmatism of the magnetic field in one direction to correct the results at all points on the screen, diagonally or bisected by the X and Y axes and the angle formed by these X and Y axes. Correction along the line is required.
    The coils forming the electromagnetic quadrupole are arranged around the neck of the cathode ray tube. The at least two coil pairs 20, 21 are four coil pairs 20 that continuously form the north and south poles of the magnet to correct the astigmatism results along the X and Y axes, and the astigmatism along the diagonal line. It consists of four different coil pairs 21 which form the north and south poles of the magnet in the same successive order to correct the results, and the magnetic poles of these two coil pairs are arranged with the directions shifted by 45 ° from each other. .
    4A, 4A ', 4B and 4B' show the results of coils 20 and 21 of an electromagnetic quadrupole on a section 30 of an electron beam. According to the polarity of the currents I and I 'circulating in each of the coils 21 and 20, the electron beam compensates for the undesirable consequences of the astigmatism of at least one magnetic deflection magnetic field at every point of the screen of the cathode ray tube. The coil 20 may be deformed and extended in the X or Y direction and the coil 21 in the diagonal D1 or D2 direction.
    3 illustrates an embodiment mode of the astigmatism corrector according to the prior art. The winding coils 20 and 21 of the compensator are formed around a cylindrical ring 23 of ferromagnetic material, and the set of four X-axis astigmatism correction coils is 45 ° displaced in a direction with respect to the set of diagonal astigmatism correction coils. It is arranged in a state.
    The astigmatism corrector is mounted on the neck of the cathode ray tube behind the deflector as shown in FIG.
    The current flowing through the astigmatism corrector coil is at approximately the same frequency as the scan signal applied to the horizontal deflection coil. In the conventional method, the current flowing through the coil to correct the astigmatism in the axial direction is a weighted sum of two parabolic currents having a vertical sweep frequency and a horizontal sweep frequency as frequencies. The current I is in the same way the weighted product of two currents having a sawtooth frequency equal to the vertical sweep frequency and a parabolic frequency equal to the horizontal sweep frequency.
    By such a conventional apparatus, it was possible to correct spots forming defects caused by magnetic field astigmatism until reaching a horizontal sweep frequency of about 64 kHz.
    It can be seen that the correction at higher horizontal sweep frequencies becomes smaller and smaller as the correction signal frequency increases.
    These problems are caused by the metal grid of the electron gun which acts as an obstacle to the magnetic field input from the astigmatism corrector. This delays the setting of the magnetic field accompanying the correction phase error. The correction magnetic field is changed by T with respect to the current circulating in the electromagnetic quadrupole at time t by the electron beam, and this delay value T increases with the correction signal frequency.
    High resolution display devices using cathode ray tubes operate at sweep frequencies of up to 200 kHz. With such a frequency value, the astigmatism correction device according to the prior art cannot be used even more because the harmonics of 600 kHz frequency exist in the correction current. In addition, even when compensating for the setting delay of the correction magnetic field for a predetermined horizontal sweep frequency, compensation is almost impossible, for example, by an electronic circuit, and in a display device having a high frequency horizontal sweep, it is quite cumbersome to use this type of compensation. do.
    As shown in FIG. 5, in a preferred embodiment of the present invention, two coil pairs 20, 21 are formed by coating a conductive layer on the flexible support 40. The coils thus formed are supported on a flat support wound around the neck of the cathode ray tube to form the astigmatism corrector 13.
    Each coil pair may be formed on a different flexible support or preferably on the same flexible support. In the latter case the coils may be formed on one or both sides of the flexible support 40. The size of the device is minimized depending on the particular coil in which, for example, a pair of coils forming quadrupoles on one support surface and another pair of coils forming quadrupoles on the opposite support surface are installed. This arrangement provides the further advantage of not being able to position one of the coil pairs with respect to each other.
    The embodiment of the present invention illustrated in FIG. 5 is connected to one coil pair in which an electromagnetic quadrupole is formed on one of the support surfaces of the flexible support portion 40, which is an insulating material, and to be connected on the opposite side of the side on which the coil pair is installed. The state where the other coil pair which forms the electromagnetic quadrupole between coil pairs is installed. Electrical continuity is maintained by a connection line across the wall of the flexible support 40, such as a connection line 42 to the coil 21, which is in the form of a metalized hole.
    In addition, the flexible support 40 includes a horizontal tab 50 so that power is applied to the connection lines of the coils 20 and 21.
    Once the coil is installed, a very small volumetric flexible support is inserted directly on the neck of the cathode ray tube or underneath the rear of the deflector 1 or on the separator 2 or as illustrated in FIG. 6. Likewise, the vertical deflection coils between the coils and the ferromagnetic material 5 may be disposed on the same plane as the rear surface of the ring core. The latter configuration can obtain the following advantages.
    According to the electron beam deflection system of the present invention, astigmatism from the fact that the maximum effect according to the electron beam with respect to a predetermined correction current is close to the ring core of the ferromagnetic material focusing the magnetic field generated by the two coil pairs 20 and 21. The best sensitivity of the compensator can be guaranteed.
    The compensator according to the invention is sufficiently removed from the horizontal deflection coil in order to prevent the generation of interference between these coils subjected to astigmatism provided under high pressures and low pressures of about 1000 volts in the horizontal or line windings. Can be.
    The present invention is not limited to the embodiment described above, and astigmatism correction can be performed by two flat coil pairs made of insulated wires, wherein the two coil pairs have a coil axis of 45 to each other for each coil pair. It consists of a shape in which another coil is placed just above one coil so as to be changed. A flexible or rigid cylindrical support can be mounted between two coil pairs to form a mechanical unit into a correction coil, which coils can be positioned and fixed on the support, for example by an adhesive.
    权利要求:
    Claims (10)
    [1" claim-type="Currently amended] In an electron beam deflection system for a cathode ray tube,
    A pair of saddle-shaped horizontal deflection coils 3, a pair of vertical deflection coils 4, a separator 2 that insulates the two deflection coil pairs from which at least one deflection coil pair generates a non-point deflection magnetic field and the deflection A deflector 1 composed of a ring core 5 of ferromagnetic material for concentrating a magnetic field generated by the coil;
    A deflection magnetic field astigmatism corrector (13) having a plurality of radial axis coils arranged around the neck (8) of the cathode ray tube (6) to generate a magnetic field operating in the shape of the electron beam (12); ,
    The astigmatism corrector (13) is characterized in that the electron beam deflection system for a cathode ray tube is arranged at least partially around a rear portion of at least one deflection coil pair around the neck (8) of the cathode ray tube (6).
    [2" claim-type="Currently amended] 2. Electron beam deflection system according to claim 1, characterized in that the astigmatism corrector (13) is arranged at least partially adjacent the rear part of the ring core (5) of ferromagnetic material.
    [3" claim-type="Currently amended] 3. Electron beam deflection system according to claim 2, characterized in that the astigmatism corrector (13) is arranged between the rear part of the ring core (5) of the ferromagnetic material and the rear part of the vertical deflection coil (4).
    [4" claim-type="Currently amended] 4. Electron beam deflection system for cathode ray tubes according to any one of the preceding claims, characterized in that the astigmatism corrector (13) comprises two coil pairs (21, 22) each forming an electromagnetic quadrupole. .
    [5" claim-type="Currently amended] 5. Electron beam deflection system according to claim 4, characterized in that the axes of the two coil pairs (21, 22) are radially displaced by about 45 °.
    [6" claim-type="Currently amended] 6. Electron beam deflection system according to any one of the preceding claims, characterized in that the coil (21, 22) of the astigmatism corrector is positioned on a flexible support (40).
    [7" claim-type="Currently amended] 7. Electron beam deflection system according to claim 6, characterized in that the coils (21, 22) of the astigmatism corrector are positioned on both sides of the same flexible support (40).
    [8" claim-type="Currently amended] 8. Electron beam deflection system according to claim 4 or 7, characterized in that the predetermined coil pair is positioned on the same side of the flexible support (40).
    [9" claim-type="Currently amended] 9. Electron beam deflection system according to claim 8, characterized in that the electrical connection (42) between the predetermined coil pairs is positioned on the side of the support opposite the coil pairs being positioned.
    [10" claim-type="Currently amended] 10. The electron beam deflection system according to any one of claims 1 to 9, wherein the frequency of the signal applied to said horizontal deflection coil is greater than 64 kHz.
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    同族专利:
    公开号 | 公开日
    MY127814A|2006-12-29|
    FR2754636A1|1998-04-17|
    KR100456210B1|2004-11-09|
    AU4394197A|1998-05-11|
    TW388053B|2000-04-21|
    WO1998016945A1|1998-04-23|
    CN1121705C|2003-09-17|
    JP2001505353A|2001-04-17|
    EP0932910A1|1999-08-04|
    FR2754636B1|1998-11-27|
    CN1233346A|1999-10-27|
    US6300730B1|2001-10-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-10-15|Priority to FR96/12534
    1996-10-15|Priority to FR9612534A
    1997-10-13|Application filed by 데니스 에이취 엘 벡, 톰슨 튜브 앤드 디스플레이 에스. 에이.
    2000-07-25|Publication of KR20000049077A
    2004-11-09|Application granted
    2004-11-09|Publication of KR100456210B1
    优先权:
    申请号 | 申请日 | 专利标题
    FR96/12534|1996-10-15|
    FR9612534A|FR2754636B1|1996-10-15|1996-10-15|Electron beam deflection system for monochrome catholic ray tube|
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