Deflection yoke for cathode tube

专利摘要:
PURPOSE: A deflection yoke for a CRT(Cathode Ray Tube) is provided to be capable of correcting distortion and longitudinal line mis-convergence without the deterioration of lateral line convergence. CONSTITUTION: A deflection yoke for a CRT includes a plurality of magnets installed at the upper and lower portion of an opening region for correcting the distortion generated on a screen. At this time, a solenoid coil(67') is used as the magnet, wherein the solenoid coil is formed by winding a copper wire at a ferrite bar. When seeing the front view of the solenoid coil, the right portions of the solenoid coils are magnetized as an N-pole and the left portions of those are magnetized as an S-pole at an upper deflection. Preferably, the right portions of the solenoid coils are magnetized as the S-pole and the left portions of those are magnetized as the N-pole at a lower deflection.
公开号:KR20030071032A
申请号:KR1020020010548
申请日:2002-02-27
公开日:2003-09-03
发明作者:윤승찬
申请人:엘지.필립스디스플레이(주)；
IPC主号:

专利说明:

Deflection yoke for cathode tube
[20] The present invention relates to a deflection yoke for a cathode ray tube, and more particularly, to a deflection yoke for a cathode ray tube capable of correcting mis-convergence and vertical pincushion raster distortion without deteriorating vertical line convergence of a horizontal axis.
[21] The deflection yoke is a member for deflecting the electron beam generated and fired in the electron gun of the cathode ray tube, which is an essential element for the normal display of the cathode ray tube.
[22] 1 is a cross-sectional view schematically showing the structure of a cathode ray tube.
[23] Referring to Figure 1, the cathode ray tube is a panel 20 mounted on the front of the cathode ray tube; A phosphor surface 30 disposed on an inner surface of the panel 20 and coated with phosphors of red (R), green (G), and blue (B); A shadow mask (40) positioned on a rear surface of the fluorescent surface (30) to color-select the electron beam incident on the fluorescent surface (30); A funnel 50 coupled to a rear surface of the panel 20 to maintain the interior in a vacuum state; An electron gun (70) mounted inside a tubular neck portion that is a rear portion of the funnel (50) to generate and fire an electron beam; The deflection yoke 60 surrounds the outer side of the neck of the funnel 50 and deflects the electron beam emitted from the electron gun 70 in a horizontal or vertical direction.
[24] In particular, the deflection yoke 60 includes a pair of horizontal deflection coils 61 for deflecting the electron beam emitted from the electron gun 70 in the horizontal direction as shown in Fig. 2 showing the deflection yoke in the cathode ray tube; A pair of vertical deflection coils 62 for deflecting the emitted electron beams in the vertical direction; Conical ferrite core (64) to reduce the loss of the magnetic force generated by the current flowing through the horizontal and vertical deflection coils (61, 62) to improve the deflection efficiency; A holder (63) on which the horizontal and vertical deflection coils (61) and (62) and ferrite cores (64) are installed and which are directly coupled to the neck portion of the funnel (50); A comma precoil 65 installed at the rear of the holder 63 to improve comma aberration; A ring band 66 installed at the rear of the holder 63 to couple the funnel 50 and the deflection yoke 60; A magnet 67 is installed outside the end of the opening of the holder 63 to correct raster distortion of the screen.
[25] Looking at the operation of the conventional deflection yoke 60 having such a configuration, first applies a current having a frequency of 15.75KHz or more to the horizontal deflection coil 61 and deflects the electron beam in the horizontal direction by using the magnetic field generated accordingly, A current having a frequency of 60 Hz is applied to the vertical deflection coil 62 to deflect the electron beam in the vertical direction by using a magnetic field generated thereby.
[26] The deflection of the electron beam is generally based on a self-convergence method in which a non-uniform magnetic field enables the trigeminal beam to achieve screen convergence without using an additional circuit and an additional device. And by adjusting the winding distribution of the vertical deflection coil to generate a barrel or pincushion type magnetic field for each part of the front, middle and rear parts of the deflection yoke, so that the deflecting force is applied according to the position of the electron beam. It's a way to make it happen.
[27] In such a self-convergence method, it is difficult to deflect the electron beam to a desired place only by the magnetic fields of the horizontal and vertical deflection coils 61 and 62, so that a high permeability ferrite core 64 is used to compensate for this. Minimize the loss to increase the magnetic force.
[28] The pincushioned horizontal deflection magnetic field is generated by a horizontal deflection coil, and as shown in FIG. 3, the upper horizontal deflection coil 61a and the lower horizontal deflection coil 62b are configured in parallel, and a sawtooth wave-shaped horizontal deflection current is generated. This is achieved by authorization.
[29] Looking in more detail with respect to the horizontal deflection, when the three red, green, and blue electron beam generated by the electron gun 70 passes through the horizontal deflection magnetic field region, the electron beam is deflected in the horizontal direction by Fleming's left hand law. .
[30] At this time, the magnet 67 provided on the outside of the front part of the holder 63 is arranged so that the upper magnet is positioned so that the S pole is on the left side and the N pole is on the right side, and the lower magnet is on the contrary, the N pole is on the left side. The S pole is placed on the right side.
[31] The magnets 67 arranged in this way generate a pincushion type magnetic force line as shown in FIGS. 4 and 5, and the electron beam passing through the magnetic force line is forced upward by Fleming's left hand law. The movement becomes larger in the center part, so that the electron beam passing through this part moves further upwards, and the other electron beams move according to their respective positions. The movement of the electron beam allows the entire raster shape to have linearity on the screen, and the barrel-shaped misconvergence of the vertical axis is also corrected.
[32] However, such correction of raster distortion and misconvergence using a magnet involves several problems.
[33] First, in the conventional cathode ray tube, when the blue and red misconvergence is set to 0, vertical misconvergence as shown in FIG. 6 occurs due to the distortion of the magnetic field distribution and the balance problem between the curved surface of the panel. That is, in the vertical direction of the phosphor screen surface, the first and second upper limit blue lines 1B are positioned in the left direction of the red line 1R, and the third and fourth upper limit blue lines 2B are positioned in the left direction of the red line 2R.
[34] This phenomenon occurs because, as shown in FIG. 7, a four-pole magnetic field (a magnetic field generated by magnets connected to the upper and lower sides) is generated in addition to the pincushion-shaped magnetic field caused by the magnet.
[35] The second problem is also a phenomenon caused by the magnetic field of the four-pole type, the horizontal misconvergence (3R, 4R, 3B, 4B) problem occurs in the middle region on the horizontal axis.
[36] As described above, an unwanted transverse misconvergence and vertical misconvergence are caused by the correction due to the magnet, and thus the problem of the correction of the misconvergence due to the magnet does not achieve its original purpose.
[37] An object of the present invention is to provide a deflection yoke for a cathode ray tube capable of correcting vertical distortion and vertical line convergence correction in an intermediate region without deteriorating transverse convergence.
[1] 1 is a cross-sectional view schematically showing the structure of a cathode ray tube.
[2] 2 is a schematic diagram showing a deflection yoke in a cathode ray tube.
[3] 3 is a schematic diagram showing a horizontal deflection circuit and a horizontal deflection current applied to the horizontal deflection circuit.
[4] 4 is a schematic diagram showing a magnet arrangement and a magnetic force line distribution according to the conventional deflection yoke.
[5] 5 is a schematic diagram showing the motion of an electron beam by a magnet magnetic field line of a conventional deflection yoke;
[6] 6 is a schematic diagram showing a miss convergence pattern due to a conventional deflection yoke.
[7] 7 is a schematic diagram showing a magnetic force diagram by a magnet of a conventional deflection yoke;
[8] 8 is a structural diagram showing a deflection yoke according to an embodiment of the present invention.
[9] Figure 9 is a schematic diagram showing the magnetic force by the solenoid coil in the deflection yoke according to an embodiment of the present invention.
[10] 10 is a connection diagram of the solenoid coil and the vertical deflection coil in the deflection yoke according to the preferred embodiment of the present invention.
[11] <Description of the symbols for the main parts of the drawings>
[12] 20 Panel 30 fluorescent surface
[13] 40 ... shadow mask 50 ... funnel
[14] 60 ... deflection yoke 70 ... electron gun
[15] 61 ... Horizontal deflection coils 62 ... Vertical deflection coils
[16] 63 ... holder 64 ... ferrite core
[17] 65 ... comma-free coil 66 ... ring band
[18] 67.Magnet 67 '... Solenoid coil
[19] 61a ... upper deflection coil 61b ... lower deflection coil
[38] In order to achieve the above object, the cathode yoke deflecting yoke according to the present invention is provided in the cathode yoke deflecting yoke provided with a magnet for correcting the distortion on the screen is installed on the upper and lower ends of the opening, the magnet is a solenoid coil winding a copper wire on a ferrite bar It is characterized by that.
[39] Here, the solenoid coil is characterized in that the upper and lower parts on the right side is N pole, the left side is S pole, and when the lower side is deflected, the upper and lower parts have the S pole and the left side are N pole. In addition, the solenoid coil is further characterized in that the upper and lower parts are connected in series to the vertical deflection coil.
[40] Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.
[41] 8 is a structural diagram showing a deflection yoke according to an embodiment of the present invention.
[42] Referring to FIG. 8, it can be seen that the magnets located above and below the inlet of the holder 63 are solenoid coils 67 ′ wound around a ferrite bar. The polarity of the magnets is vertically up and down as shown in FIG. 9. The pair of solenoid coils 67 'are configured such that the right side is the N pole and the left side is the S pole when viewed from the front, and in the case of the downward deflection, the upper and lower pair of solenoid coils 67' are the S pole when the right side is viewed from the front, It is installed so that the left side becomes the N pole.
[43] Since other members are the same as in the conventional description, the description is omitted.
[44] On the other hand, the solenoid coil 67 'is connected in series to the vertical deflection coil 62 of the deflection yoke as shown in FIG. 10, whereby the solenoid coil 67' operates in synchronization with the vertical deflection coil. Therefore, as shown in FIG. 9, the vertical deflection coil has the same polarity as the vertical deflection. Therefore, since the quadrupole component as shown in FIG. 7 does not occur, vertical line convergence and vertical raster distortion of the Y axis can be corrected without the occurrence of vertical misconvergence and horizontal misconvergence in the middle of the horizontal axis.
[45] As described above, the deflection yoke for a cathode ray tube according to the present invention uses a solenoid coil wound around a ferrite bar as a magnet and connects it in series to a vertical deflection coil, thereby preventing the occurrence of miss convergence due to the four-pole component of the magnet. This prevents the vertical misconvergence and the vertical raster distortion from being effectively compensated.

权利要求:
Claims (3)
[1" claim-type="Currently amended] In the deflection yoke for cathode ray tubes provided with upper and lower ends of the opening and provided with a magnet for correcting distortion on the screen,
The magnet is a deflection yoke for a cathode ray tube, characterized in that the solenoid coil winding the copper wire on the ferrite bar.
[2" claim-type="Currently amended] The method of claim 1,
The solenoid coil has an N pole on the right side and an S pole on the left side in the upper side deflection when viewed from the front.
A deflection yoke for cathode ray tubes, characterized in that the upper and lower portions have an S pole on the right side and an N pole on the left side during the lower deflection.
[3" claim-type="Currently amended] The method of claim 1,
The solenoid coil deflection yoke for cathode ray tubes, characterized in that the upper and lower parts are connected in series to the vertical deflection coil.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2002-02-27|Application filed by 엘지.필립스디스플레이(주)

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2002-02-27|Priority to KR1020020010548A

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2003-09-03|Publication of KR20030071032A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020020010548A|KR20030071032A|2002-02-27|2002-02-27|Deflection yoke for cathode tube|