KR20050087179A - Deflection yoke for color crt - Google Patents

Abstract

The present invention relates to a deflection yoke for a color cathode ray tube that can improve convergence characteristics by changing the size and number of upper and lower pin correction magnets in an opening of a deflection yoke.

As described above, the present invention provides a panel having a phosphor screen formed therein, a funnel coupled to the panel, an electron gun mounted to the funnel to emit an electron beam, and a vertical and horizontal deflection coil for deflecting the electron beam emitted from the electron gun. In a color cathode ray tube including a deflection yoke and a shadow mask for color-selecting the electron beam emitted from the electron gun, the horizontal length A of the magnets formed at the upper and lower ends of the opening of the deflection yoke is determined by the horizontal deflection coil. It is characterized by being 3/4 to 4/3 of the opening diameter.

Description

Deflection yoke for color cathode ray tube {Deflection Yoke for Color CRT}

The present invention relates to a color cathode ray tube including a deflection yoke having a saddle-type deflection coil, which is displayed on the cathode ray tube by changing the size and number of upper and lower pin correction magnets of the opening of the deflection yoke. By changing the beam arrangement of the screen, the shadowmask curvature of the cathode ray tube can be advantageously designed to improve the drop characteristics of the cathode ray tube, and the purpose of the ball magnetic field of the left and right pin characteristics is to be improved. have.

In general, a color cathode ray tube uses an in-line electron gun, and in the cathode ray tube using the in-line electron gun, red (R), green (G), and blue (B) electron beams are arranged side by side horizontally. Therefore, in order to converge the three electron beams at one point of the fluorescent surface, the deflection yoke of the cathode ray tube adopts self-converging using a non-uniform magnetic field.

As shown in FIG. 1, the color cathode ray tube has a panel 1 mounted on the front surface of the cathode ray tube and a phosphor of red (R), green (G), and blue (B) on the inner surface of the panel 1. And a shadow mask 4 having a color discriminating function of the electron beam 10 incident on the fluorescent surface 3 behind the fluorescent surface 3, and a rear surface of the panel 1. And a funnel 2 mounted to maintain the interior in a vacuum state, an electron gun 5 and the funnel mounted inside the tubular neck portion retracted to the rear of the funnel 2 to launch the electron beam 10. It consists of a deflection yoke 6 which surrounds the outside of 2) and is installed to deflect the electron beam 10 in the horizontal or vertical direction.

In particular, the deflection yoke 6 vertically couples the pair of horizontal deflection coils 61 and the electric electron beam to deflect the electron beam 10 emitted from the electric electron gun 7 inside the cathode ray tube in a horizontal direction as shown in FIG. 2. It is used to improve the deflection efficiency by reducing the loss of magnetic force generated by the current flowing through the pair of vertical deflection coil 62, the electric horizontal 61, and the vertical deflection coil 62 to deflect in the direction. The conical ferrite core 64, the horizontal deflection coil 61, the vertical deflection coil 62 and the ferrite core 64, while determining the mechanical relative position, and fixed and coupled mechanically, the horizontal deflection Holder (63), which serves to insulate between the coil (61) and the vertical deflection coil (62) and to be coupled to the cathode ray tube (1) to be applied at the same time, the holder (Holder, 63) It is mainly installed on the neck side of COMA Free coil (65) to improve the comma aberration generated by the vertical barrel type magnetic field, and the cathode side of the holder 63, the electric cathode ray tube 1 and the electric deflection yoke (6) Ring band 66, which mechanically couples the gears, to the cross arm that is mounted in the opening of the electric deflection yoke to correct the screen characteristics, and the beam arrangement, R, G, It consists of a magnet 67 used for correcting the B beam characteristic.

In addition, the conventional deflection yoke 6 flows a current having a frequency of 15.75 KHz or higher to the horizontal deflection coil 61, and deflects the electron beam inside the cathode ray tube in the horizontal direction by using a magnetic field generated accordingly. An electric current having a frequency of 60 Hz is usually supplied to the electric vertical deflection coil 62 to deflect the electron beam in the vertical direction by using a magnetic field generated accordingly.

In addition, self-convergence-type deflection allows three electron beams to achieve convergence on the screen without using additional circuits and additional devices by using non-uniform magnetic fields by the electric horizontal 61 and vertical deflection coils 62. The yoke 6 is mainly developed.

That is, by adjusting the winding distributions of the horizontal deflection coil 61 and the vertical deflection coil 62, each part (opening part, middle part, and neck part) is made into a barrel or pin-cushion type magnetic field. The electron beams experience different deflection forces according to their positions, so that they can be collected at the same point at different distances from the starting point of the electron beam to the screen of the arrival point.

In addition, when a current is applied to the horizontal and vertical deflection coils 61 and 62 to create a magnetic field, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field generated by the horizontal and vertical deflection coils 61 and 62. 64), the magnetic field is increased by increasing the efficiency of the magnetic field by minimizing the loss in the return path of the magnetic field.

In addition, the pair of horizontal deflection coils include an upper horizontal deflection coil and a lower horizontal deflection coil formed in a saddle shape, and parallel the upper 41 and the lower horizontal deflection coils 41 'as shown in FIG. After the connection, the sawtooth wave-shaped horizontal deflection current flows to form a pincushion-shaped horizontal deflection magnetic field.

When three electron beams, ie, red, green, and blue three beams emitted from the electron gun 5 pass through the electric horizontal deflection magnetic field region, the force received by the Fleming's left-hand law is determined between the inner surface of the electric horizontal deflection coil and the electron beam. The horizontal deflection is inversely proportional to the square of the distance.

Conventionally, the beam arrangement is corrected by attaching the magnet 67 to the cross arm portion of the deflection yoke 6 for the cathode ray tube. When the electron beam 10 emitted from the electron gun is deflected to face forward. As shown in FIG. 4, the N pole of the upper magnet was placed on the left side from the front to make the -Bx magnetic field, and the magnetized to be located on the right side from the front of the S pole.

The magnet 67 installed in this way has an effect of disposing a magnetic force line as shown in FIG. 4 and changes the convergence characteristic displayed in the CRT.

That is, the deflected electron beam 10 moves to the left and right sides of the R-beam and B-beam according to the deflected angle as shown in FIG. Depending on the intensity of Gauss and the size of the magnet, different movement amounts and directions are obtained to obtain an appropriate amount of screen characteristics.

Therefore, when the pins on the left and right sides of the screen displayed as shown in FIG. 6 are corrected with the horizontal and vertical deflection coils 61 and 62 or other corrections without the chassis circuit of the deflection yoke as described above. The pin distortion phenomenon cannot be completely improved, and the beam arrangement is greatly changed at the corner portion of the screen, and the convergence characteristic cannot be completely solved.

Looking at the problems of the prior art, first, the shadow mask curvature of the cathode ray tube is inevitable and the radius of curvature is inevitable when the amount of pins on the left and right sides of the screen displayed by the horizontal and vertical deflection coils or other corrections are corrected. Even if the shadow mask design, there is a problem that the drop test characteristics of the tube is disadvantageous. Such a problem is that as the screen curvature increases as the screen becomes flat and large, there is a defect that provides more poor screen characteristics to users of the CRT TV or monitor.

Secondly, if the pins on the left and right sides of the screen displayed by horizontal and vertical deflection coils or other corrections are corrected, the corners and just below the corners, which are difficult screen characteristics in the yoke, are corrected. Due to the vertical imbalance between the R (Red) and B (Blue) beams, the convergence characteristics could not be improved.

Accordingly, an object of the present invention is conceived to solve the above problem, by adjusting the position or size of the magnet of the deflection yoke, the vertical direction between the R beam and the B beam of the corner portion and the portion immediately below the corner, which is a screen characteristic to be displayed The purpose is to solve the convergence characteristics due to imbalance.

Technical means of the present invention for achieving this object, a panel having a phosphor screen formed on the inner surface, a funnel coupled to the panel and an electron gun mounted on the funnel to emit an electron beam, and deflecting the electron beam emitted from the electron gun A color cathode ray tube including a deflection yoke having vertical and horizontal deflection coils formed therein and a shadow mask for color-selecting an electron beam emitted from the electron gun, wherein the width of the magnet formed at the top and bottom of the opening of the deflection yoke ( A) is 3/4 to 4/3 of the opening diameter of the horizontal deflection coil.

As a second technical solution, a panel having a phosphor screen formed on an inner surface thereof, a funnel coupled to the panel, an electron gun mounted on the funnel to emit an electron beam, and a vertical and horizontal plane for deflecting the electron beam emitted from the electron gun. In a color cathode ray tube including a deflection yoke in which a deflection coil is formed and a shadow mask for color-selecting an electron beam emitted from the electron gun, the magnet is 10 mm to 10 mm from the outermost upper and lower ends of the opening of the deflection yoke. It is characterized in that the 20mm spaced apart.

The length B of the magnet is 5 mm to 15 mm, and the height H of the magnet is 5 mm to 15 mm.

In addition, the magnet is preferably at least one.

The magnet is preferably formed so that the right end is the N pole and the left end is the S pole when viewed from the screen side to the neck side.

Preferably, the shadow mask is characterized in that the AK material (Aluminium Killed).

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Generally, the deflection yoke 6 flows a current having a frequency of 15.75 KHz or higher to the horizontal deflection coil 61, and deflects the electron beam in the CRT horizontally by using a magnetic field generated therein, and also vertically. The deflection coil 62 is supplied with a current having a frequency of 60 Hz, and the electron beam is deflected in the vertical direction by using a magnetic field generated accordingly.

And by using the non-uniform magnetic field by the horizontal and vertical deflection coils (61, 62), the deflection yoke of the self-convergence type that allows three electron beams to achieve convergence on the screen even without using a separate additional circuit and additional device (6) is mainly being developed.

That is, the winding distribution of the horizontal deflection coil and the vertical deflection coil is formed to create a barrel or pin-cushion type magnetic field for each part (opening part, middle part, and neck part), and the three electron beams have different deflection forces according to their positions. This allows them to gather at the same point at different distances from the starting point of the electron beam to the screen of the arrival point.

In addition, in the case of making a magnetic field by flowing current to the horizontal and vertical deflection coils 61 and 62, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the coils 61 and 62, and the ferrite core 64 of high permeability is used. Therefore, the magnetic field is increased by increasing the efficiency of the magnetic field by minimizing the loss on the return path of the magnetic field.

Therefore, according to the present invention, by changing the attachment position and the size of the pin correction magnet 67 of the opening of the deflection yoke, not only the screen corner beam arrangement but also the center beam arrangement is changed so that the drop strength of the cathode ray tube is advantageous. The mask curvature can be designed so that when the pins on the left and right sides of the screen displayed by horizontal and vertical deflection coils (61, 62) or other corrections are corrected, the corner part, which is a screen characteristic that is difficult to correct in the deflection yoke (6), The deflection yoke is configured to solve the convergence characteristic caused by the vertical imbalance between the R (Red) beam and the B (Blue) beam just below the corner.

On the other hand, the conventional magnet is formed as shown in Figure 2 by installing the magnet 67 insertion structure in the opening of the deflection yoke, the magnetic force lines are distributed as shown in Figure 4, but the magnetic force lines are not formed in the deflection yoke as a whole, the electron beam is also not fully deflected. As a result, the screen characteristics could not be improved, and in addition, the miss landing phenomenon caused by the beam array change could occur.

Therefore, in the present invention, as shown in Fig. 7, the length A of the magnet is formed to be 3/4 or more and 4/3 or less of the opening diameter W of the horizontal deflection coil, so as to form the cross arm portion attached to the opening holder of the deflection yoke. It was. As described above, when the length A of the magnet is larger than 3/4 of the opening diameter of the horizontal deflection coil, as shown in FIG. 8, the magnetic force line distribution of -Bx is formed wider than that of the conventional magnetic force line distribution and is displayed. Allow you to adjust the amount of (Pin). On the other hand, when the transverse length A of the magnet is 4/3 or more of the opening diameter W of the horizontal deflection coil, the change in the corner beam arrangement is more increased than the change in the center beam arrangement, resulting in poor screen characteristics.

In addition, the cross arm portion affects a part of the magnetic field, and thus the effect of providing the magnet according to the present invention is better.

The magnet is preferably attached 10 to 20 mm apart from the upper and lowermost outermost opening of the horizontal deflection coil of the deflection yoke, if formed in the cross-arm portion as in the prior art the distribution of the line of magnetic force is horizontal Since it does not occur to the cross arm side of the deflection coil, an area which does not deflect the electron beam is generated, so that it is formed to be spaced about 10 to 20 mm apart.

Meanwhile, as shown in FIG. 8, the length B of the magnet is 5 to 15 mm, and the height H is 5 to 15 mm.

If the magnet longitudinal length (B) and height (H) is smaller than 5 mm, it is difficult to generate magnetic force lines of the north pole and the south pole. If the magnet longitudinal length and height is larger than 15 mm, it is attached to the deflection yoke opening and assembled in the cathode ray tube. Since it becomes difficult at the time, the length and height of the magnet is formed smaller than 15mm.

The magnet according to the present invention has the screen characteristic corrected by the screen characteristic correction magnet 67 mounted on the cross arm attached to the opening holder of the deflection yoke 6, and the electron beam 10 emitted from the electron gun is upward. When the N pole of the magnet is viewed from the screen side to the neck side so that it can be deflected by creating a -Bx magnetic field, the upper pin correction magnet is formed so that the right end is the N pole and the left end is the S pole, and the lower pin correction magnet is The right end is S pole, and the left end is N pole.

Therefore, the magnet 67 formed as described above has a distribution of pin-cushion type magnetic force lines made by the R and B electron beams in the horizontal direction at 12 o'clock and changes the misconvergence of the horizontal direction (commonly referred to as YBH). At the same time, the horizontal and vertical misconvergence of the R and B electron beams (commonly referred to as CBH and CCV) also changes in the 2 o'clock of the screen. In addition, the position of the G-beam relative to the R-beam or B-beam of the corner portion which is hard to change when the beam array is changed in the cathode ray tube or the electron gun is changed to compensate for the misconvergence of the entire screen.

Meanwhile, when the three electron beams B, G, and R beams are viewed as a group, as shown in FIG. 9, the group is gradually separated from the other three electron beams B, G, and R beam groups located in the next column. Degroup phenomenon is known, but the above-mentioned degroup phenomenon is remarkably generated. However, when the magnet according to the present invention is used, the degroup phenomenon is less than 10%, so the beam arrangement is also improved.

In another embodiment of the present invention, when the magnet for beam array correction is magnetized to two or more magnets, the range of magnetic force lines becomes wider as shown in FIG.

The shadow mask is preferably an AK mask (Aluminium Killed), the mask of the AK material is better than the conventional Invar (Drop) mask (Drop) characteristics can be more effectively managed beam arrangement Because there is.

Therefore, according to the present invention, by changing the attachment position and size of the pin correction magnet of the opening of the deflection yoke, the mask curvature so that the drop strength of the tube is advantageous by changing the beam arrangement at the center as well as the beam arrangement at the corner of the screen. When the pins on the left and right sides of the screen, which can be designed and displayed by horizontal and vertical deflection coils or other corrections, are corrected, the corners and just below the corners, which are difficult screen characteristics in the deflection yoke, are corrected. It is possible to solve the convergence characteristic due to the vertical imbalance between the R (RED) beam and the B (BLUE) beam.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Therefore, according to the present invention, by forming the transverse length A of the magnet to 3/4 or more of the diameter of the horizontal deflection coil, the pin and misconvergence in the displayed screen are compensated for, and R, G In addition, it prevents the degroup phenomenon, which is the group position between the B beams, and replaces the pin compensation chassis circuit in the chassis itself, thereby reducing the cost.

1 is a schematic diagram of a typical cathode ray tube.

2 is a schematic view of a conventional deflection yoke.

3 is a circuit diagram of a horizontal deflection coil for horizontally deflecting an electron beam;

4 is a magnetic force line distribution diagram according to a magnet arrangement of a conventional deflection yoke.

Fig. 5 is a diagram showing an example of misconvergence changed by the utilization of a conventional magnet.

6 is a diagram showing an example of a change in the pin (Pin) changes by the utilization of the conventional magnet.

7 shows a pin correction magnet mounted to a deflection yoke according to the present invention.

8 is a view showing a magnet according to the present invention.

9 is a magnetic field distribution diagram of the magnet arrangement of the deflection yoke according to the present invention.

10 is a view showing another embodiment of a magnet of a deflection yoke according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1 panel 6: deflection yoke

61: vertical deflection coil 62: horizontal deflection coil

67: magnet W: diameter of the horizontal deflection coil

Claims (10)

A panel having a phosphor screen formed on an inner surface thereof, a funnel coupled to the panel, an electron gun mounted to the funnel to emit an electron beam, and a deflection yoke having vertical and horizontal deflection coils for deflecting the electron beam emitted from the electron gun; In the color cathode ray tube comprising a shadow mask for color-selecting the electron beam emitted from the electron gun, The horizontal length (A) of the magnets installed at the upper and lower ends of the opening of the deflection yoke is 3/4 to 4/3 or less of the diameter of the opening of the horizontal deflection coil. The method of claim 1, The magnet is a deflection yoke for color cathode ray tube, characterized in that formed on the cross arm attached to the deflection yoke opening holder. The method of claim 1, The magnet is deflected yoke for the color cathode ray tube, characterized in that attached to be spaced apart 10mm ~ 20mm from the outermost upper and lower ends of the opening of the horizontal deflection coil. A panel having a phosphor screen formed on an inner surface thereof, a funnel coupled to the panel, an electron gun mounted to the funnel to emit an electron beam, and a deflection yoke having vertical and horizontal deflection coils for deflecting the electron beam emitted from the electron gun; In the color cathode ray tube comprising a shadow mask for color-selecting the electron beam emitted from the electron gun, The magnet is deflected yoke for the color cathode ray tube, characterized in that attached to be spaced apart 10mm ~ 20mm from the outermost upper and lower ends of the opening of the horizontal deflection coil. The method according to claim 1 or 4, The vertical length (B) of the magnet is a deflection yoke for a color cathode ray tube, characterized in that 5mm ~ 15mm. The method according to claim 1 or 4, The height (H) of the magnet is a deflection yoke for the color cathode ray tube, characterized in that 5mm ~ 15mm. The method according to claim 1 or 4, Said magnet is at least one deflection yoke for the color cathode ray tube, characterized in that. The method of claim 7, wherein The magnet is deflection yoke for color cathode ray tube, characterized in that formed in two or more than four. The method according to claim 1 or 4, When the magnet is viewed from the screen side to the neck side, the upper pin correction magnet is formed so that the right end is the N pole, and the left end is the S pole, and the lower pin correction magnet is the S end and the left end is the N pole. Deflection yoke for color cathode ray tube, characterized in that formed so as to be. The method according to claim 1 or 4, The shadow mask is a deflection yoke for color cathode ray tube, characterized in that the AK (Aluminium Killed).