KR20010018033A - Deflection yoke of cathode-ray tube - Google Patents

Abstract

PURPOSE: A deflecting yoke for a cathode-ray tube is provided to improve a deflection characteristic as well as a top and bottom inner pincushion raster distortion characteristic of a screen. CONSTITUTION: Horizontal/vertical deflecting coils(11)(12) are provided to deflect an electron beam. A ferrite core(14) is used to reduce a loss of a magnetic force of a vertical deflecting magnetic field generated from the vertical deflecting coil. A holder(13) fixedly mounts the horizontal/vertical deflecting coils and the ferrite core, and at the same time insulates the horizontal/vertical deflecting coils. A convergence coil(15) is mounted to a neck portion of the holder to improve a coma aberration occurring by a vertical barrel magnetic field. First magnets(16-1) are attached to the top and bottom of the opening of the horizontal deflecting coil to compensate for the inner raster distortion of the screen. Second magnets(16-2) are attached to the top and bottom of the end portion of the opening of the deflecting yoke(10) to compensate for upper and lower raster distortions of the screen.

Description

Deflection yoke of cathode-ray tube

The present invention relates to a deflection yoke for a cathode ray tube having a saddle-shaped deflection coil, and more particularly, an upper and lower inner pincushion raster of screen characteristics which may occur due to lack of correction of upper and lower raster distortion according to the planarization and the large screen trend of the cathode ray tube. To prevent distortion (Top Bottom Inner Pincushion Raster Distortion), a first magnet for fixing up and down distortion to the center of the screen is attached close to the opening flange of the horizontal deflection coil, and a correction for reducing distortion at the top and bottom ends of the screen. By magnetizing the second magnet to the polarity opposite to the first magnet and attaching it to the upper and lower sides of the holder opening of the deflection yoke, it is possible to greatly improve the characteristics of the upper and lower inner pincushion distortion due to the flattening while improving the deflection characteristics. It is about magnet of deflection yoke.

A typical cathode ray tube is a glass panel 1 having a substantially rectangular shape when viewed from the front, a funnel-shaped glass funnel 2 coupled to the panel 1, and a funnel 2, as shown in FIG. The cylindrical glass neck 3 provided in the edge part of which diameter is small is formed.

In the neck 3, an electron gun 4 which is arranged in a line on the same horizontal plane and scans the electron beam 5 of red (R), green (G) and blue (B) is enclosed, and the neck of the funnel 2 is enclosed. In the vicinity of the (3) side, a self-convergence deflection yoke 8 using a non-uniform magnetic field is mounted to deflect the electron beam 5 to the front surface of the phosphor screen 7.

The deflection yoke 8 generates a pincushion-type horizontal deflection field and a barrel-type vertical deflection field, thereby generating three R, G, and B electron beams emitted from the electron gun 4 5) is deflected at a wide angle and landed on the phosphor screen 7 through a shadow mask 6, which is a color screening electrode, to display a color image.

Thus, as shown in Fig. 2 when the deflection yoke 5 mounted on the funnel 2 is viewed from the A-A 'side and from the side.

The deflection yoke 8 is basically a horizontal deflection coil 8-1 for deflecting the electron beam 5 in the horizontal direction and a vertical deflection coil 8-2 for deflecting the electron beam 5 in the vertical direction. And, mounted on the funnel (2) to fix the horizontal / vertical deflection coils (8-1) (8-2) and the ferrite core (8-4) at a predetermined position and perpendicular to the horizontal deflection coil (8-1). The magnetic force loss of the holder 8-3, which is insulated between the deflection coils 8-2, and the vertical deflection magnetic field generated on the vertical deflection coils 8-2, mounted on the holder 8-3, reduces magnetic force. It is composed of a ferrite core 8-4 used to increase the efficiency.

In addition, a convergence coil 8-5 is provided on the neck 3 side of the holder 8-3 to improve the coma aberration generated by the vertical barrel type magnetic field, and the neck 3 of the holder 8-3. Mechanically coupled to the funnel 2 by a ring band 8-6 provided at the side end, the upper and lower circumferential surfaces of the holder 8-3, that is, the openings of the deflection yoke 8, A magnet 8-7 is provided at the lower position to correct raster distortion (hereinafter referred to as "distortion") on the screen.

When the current having a frequency of 15.75 Hz or more is conducted to the horizontal deflection coil 8-1, the deflection yoke 8 configured as described above generates a pincushion type horizontal deflection magnetic field and deflects the electron beam 5 in the horizontal direction. When a current having a frequency of 60 Hz is normally conducted to the vertical deflection coil 8-2, a barrel-type vertical deflection magnetic field is generated to deflect the electron beam 5 in the vertical direction.

The horizontal deflection coil 8-1 is composed of a deflection coil on the left side and a deflection coil on the right side as shown in FIG. 3 (a), after connecting the left and right horizontal deflection coils 8-1 in parallel. Applying a sawtooth wave-shaped horizontal deflection current as shown in (b) of FIG. 3 forms a pincushion-like horizontal deflection magnetic field, which causes the electron beam 5 emitted from the electron gun 4 to deflect in the horizontal direction.

When the three electron beams emitted from the electron gun 4, ie, the red, green, and blue beams, pass through the region of the horizontal deflection magnetic field, the force received by the electron beam according to Fleming's left hand law is the inner surface of the horizontal deflection coil 8-1. Deflected in the horizontal direction in inverse proportion to the square of the distance between the electron beam and the electron beam 5.

The distortion is corrected by the magnets 8-7 attached to the upper and lower openings of the holder 8-3 so that the electron beam 5 emitted from the electron gun 4 is deflected upward. In order to make -Bx magnetic field, the upper magnet (8-7) is magnetized so that the north pole on the right side and the south pole on the left side are located.

The magnet 8-7 installed in this way forms a magnetic force line in a pincushion type magnetic force line by forming a -Bx magnetic field as shown in FIG. 4, and when the deflection upwards as shown in FIG. , B) is the center portion (12 o'clock; G) is moved a little further upward by the greater magnetic force, depending on the position of the deflection, has a different amount of movement according to the position of each RGB electron beam The raster shape may have linearity on the screen.

In addition, a pair of four-pole convergence coils (8-5) are provided on the neck portion of the deflection yoke 8 as a means for correcting the top and bottom inner pincushion raster distortion on the screen as shown in FIG. By distributing the vertical deflection current, the distortion from the center of the screen to the top and bottom ends can be corrected in proportion to the vertical size of the screen.

As described above, the conventional deflection yoke 8 equipped with a pair of magnets 8-7 in order to improve the vertical distortion of the screen has the following problems.

First, the pincushion distortion (i) near the top and bottom ends of the screen is concentrated because the magnetic field for correction applied to the correction magnet 8-7 for improving the top and bottom distortion on the screen is concentrated near the top and bottom ends of the screen as shown in FIG. Although almost straight (ii) can be corrected, the distortion occurring in the upper and lower middle areas in the center of the screen is left as a distortion correction shortage phenomenon as shown in FIG. 7, causing the problem of the upper and lower inner distortion (iii). do. This problem remains a fatal defect that provides more poor screen characteristics due to the phenomenon that the upper and lower inner distortion (iii) increases as the screen curvature increases as the screen becomes flat and large.

Second, if a pair of 4-pole convergence coils 8-5 are used to correct the upper and lower inner distortions (iii), the upper and lower inner distortions (iii) can be corrected, but the 4-pole convergence coils 8-5 Because of the effect of shifting the vertical deflection center to the neck 3 side, one of the important characteristics of the deflection yoke (BSN), that is, when three electron beams emitted from the electron gun are deflected by the deflection yoke The BNS characteristic, which is a phenomenon that the electron beam does not reach the corner of the screen due to the impact on the inner surface of the funnel 2 of the cathode ray tube, is reduced, and to solve this problem, the deflection center of the horizontal deflection coil 8-1 is reduced. It is necessary to move from the neck 3 side to the panel 1 side, thereby causing a situation that the horizontal deflection sensitivity of the deflection yoke is deteriorated.

This phenomenon is because the deflection inclination of the RGB electron beam becomes sharper as the cathode ray tube becomes wider, and thus the travel distance at which the electron beam 5 is deflected by a pair of four-pole convergence coils 8-5 increases, thereby causing a deflection yoke (8). ), When the horizontal deflection sensitivity changes from 90 ° deflection to 10 ° deflection, about 8% of sensitivity decreases, and the addition of horizontal deflection sensitivity due to the attachment of the 4-pole convergence coil 8-5. Due to deterioration, there is a problem in that the application of the 4-pole convergence coil 8-5 is practically impossible.

Accordingly, an object of the present invention is to correct the vertical distortion up to the center of the screen in order to prevent the vertical upper and lower pincushion distortion of the screen characteristics that may occur due to the lack of correction of the upper and lower raster distortion in accordance with the planarization and the large screen trend of the cathode ray tube The first magnet is attached in close contact with the opening flange of the horizontal deflection coil, and the second magnet is attached to the upper and lower sides of the opening, which is the outer surface of the holder of the deflection yoke, to correct the distortion occurring at the upper and lower ends of the screen. The present invention provides a cathode yoke deflection yoke that can greatly improve the upper and lower pincushion distortion characteristics according to the planarization of the screen while improving the deflection characteristics.

1 is a side view of a typical cathode ray tube,

Figure 2 is a detailed assembly view of the cathode ray tube deflection yoke according to the prior art, Figure 2 (a) is a side assembly view of the deflection yoke, Figure 2 (b) is a front assembly view of the deflection yoke,

3 is a deflection circuit diagram of a horizontal deflection coil of a deflection yoke according to the prior art;

4 is a view showing the arrangement of the magnet and the distribution of the line of magnetic force according to FIG.

5 is a view showing the motion of the electron beam by the magnet magnetic field lines of FIG.

FIG. 6 is a diagram illustrating distortion correction according to the electron beam movement path of FIG. 2.

FIG. 7 is a view illustrating generation of up and down inner pin cushions along the electron beam movement path of FIG. 2;

8 is a detailed assembly view of the deflection yoke according to an embodiment of the present invention, Figure 8 (a) is a side assembly view of the deflection yoke, Figure 8 (b) is a front assembly view of the deflection yoke,

FIG. 9 is a state diagram illustrating a distortion improvement effect by the electron beam movement path according to FIG. 8;

FIG. 10 is a state diagram illustrating an inner distortion improvement action by the electron beam movement path of FIG. 8.

Explanation of symbols on the main parts of the drawings

10: deflection yoke 11: horizontal deflection coil

12: vertical deflection coil 13: holder

14: ferrite core 15: convergence coil

16-1: 1st magnet 16-2: 2nd magnet

㉮: opening of deflection yoke ㉯: neck of deflection yoke

The technical means of the present invention for achieving the above objects, the magnetic efficiency of the horizontal / vertical deflection coil for deflecting the electron beam in the horizontal and vertical direction, respectively, and to reduce the magnetic force loss of the vertical deflection magnetic field generated in the vertical deflection coil Insulation between the horizontal deflection coil and the vertical deflection coil and the ferrite core used to increase the pressure and mechanically fixed and coupled while determining the mechanical relative position of the horizontal and vertical deflection coil and the ferrite core. Of the cathode ray tube having a yoke installed at the neck side of the holder to improve coma aberration caused by the vertical barrel type magnetic field and a convergence yoke mechanically coupled to the funnel by a ring band installed at the neck end of the holder. For deflection yoke:

First magnets attached to upper and lower sides of the opening of the horizontal deflection coil, respectively, for correcting inner distortion of the screen; And

And a second magnet attached to upper and lower ends of the opening of the deflection yoke, which is the upper and lower circumferential surfaces of the holder, for correcting the vertical distortion of the screen.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

8 is an assembly view showing a detailed structure of the deflection yoke according to an embodiment of the present invention, Figure 8 (a) is a side assembly view of the deflection yoke, Figure 8 (b) is a front assembly view of the deflection yoke. It will be described with reference to Figure 1 as follows.

First, the deflection yoke 10 basically includes a horizontal deflection coil 11 for deflecting the electron beam 5 in the horizontal direction, a vertical deflection coil 12 for deflecting the electron beam 5 in the vertical direction, Ferrite cores (14), horizontal and vertical deflection coils (11, 12) and ferrite cores (14) used to increase magnetic efficiency by reducing the loss of magnetic force of the vertical deflection field generated in the vertical deflection coil (12). It is composed of a holder 13 which serves to fix and couple mechanically while determining the mechanical relative position of the same and at the same time insulates between the horizontal deflection coil 11 and the vertical deflection coil 12.

In addition, a convergence coil 15 is provided on the neck 3 side of the holder 13 to improve coma aberration caused by the vertical barrel type magnetic field, and a ring band provided on the neck 3 side end of the holder 13. By means of (17) it is mechanically coupled to the funnel (2).

Then, the first magnet 16-1 is attached to the upper and lower sides of the flange of the opening of the horizontal deflection coil 11, and the upper and lower inner distortion generated at the center of the screen is corrected. The upper and lower circumferential surfaces of the holder 13, that is, the upper and lower ends of the openings of the deflection yoke 10, are mounted on the second magnet 16-2 in which the polarity opposite to that of the first magnet 16-1 is magnetized. It is designed to reduce the distortion occurring at the top and bottom ends of the screen by attaching to the position.

The deflection yoke 10 configured as described above adjusts the winding distribution of the horizontal deflection coil 11 and the vertical deflection coil 12 to produce a barrel or pincushion type magnetic field for each part (neck part, middle part, and opening part). Different deflection forces can be experienced depending on the positions of the three electron beams 5 so that they can be collected at the same points at different distances from the starting point of the electron beam 5 to the screen of the arrival point, and the deflection yoke ( Raster distortion (distortion) occurring at the center and the end of the screen is corrected by using the first and second magnets 16-1 and 16-2 respectively provided above and below the opening of the opening. The magnets 16-1 and 16-2 are manufactured by using barium or strontium as a micro component with ferrite as a main component.

In addition, when a current is applied to the deflection coils 11 and 12 to generate a magnetic field, it is difficult to deflect the electron beam 5 to the front of the screen only by the magnetic field by the coil, and the magnetic field is returned by using a ferrite core 14 having a high permeability. By minimizing the loss on the path, the magnetic field is increased to increase the magnetic force.

The non-uniform magnetic field of the horizontal and vertical deflection coils 11 and 12 allows the three electron beams 5 to achieve convergence on the screen even without using an additional circuit and an additional device. Self-convergence deflection yoke 10 is mainly developed, and when a current having a frequency of 15.75 kHz or more is conducted to the horizontal deflection coil 11, a pincushion type horizontal deflection magnetic field is generated to generate an electron beam (5). When the current having a frequency of 60 Hz is normally conducted to the vertical deflection coil 12, a barrel-type vertical deflection magnetic field is generated to deflect the electron beam 5 in the vertical direction.

That is, by adjusting the winding distribution of the horizontal / vertical deflection coils 11 and 12 to create a barrel or pincushion type magnetic field for each part (opening part, middle part, and neck part), the three electron beams 5 are respectively positioned according to their positions. It allows the user to experience different deflection forces so that they can be collected at the same point at different distances from the starting point of the electron beam 5 to the screen which is the arrival point.

In addition, when a current is applied to the deflection coils 11 and 12 to generate a magnetic field, it is difficult to deflect the electron beam to the front of the screen only by the magnetic field by the coil, so that the ferrite core 14 having a high permeability is used on the return path of the magnetic field. By minimizing the loss, the magnetic field is increased to increase the magnetic force.

In addition, it is the electron gun 4 that the distortion is corrected by the upper and lower inner distortion correction first magnets 16-1 attached to the upper and lower opening flanges of the horizontal deflection coil 11 of the deflection yoke 10. When the electron beam 5 emitted from the light beam is deflected upward, the N pole is positioned at the right side of the upper first magnet 16-1 and the S pole is positioned at the left side so as to generate a -Bx magnetic field. It was magnetized.

Of course, the upper second magnet 16-2 is magnetized so that the S pole is located on the right side and the N pole is located on the left side when viewed from the screen side.

Then, the first magnet 16-1 attached to the lower side of the deflection yoke 10 is magnetized so that the N pole is on the left side and the S pole is on the right side when viewed from the screen side, and is attached to the lower side of the deflection yoke 10. The second magnet 16-2 is magnetized so that the S pole on the left side and the N pole on the right side are located when viewed from the screen side.

As described above, the distortion correction magnet 16 of the present invention consists of two pairs, and the upper and lower inner distortion correction first magnets 16-1 and the upper and lower distortion correction second magnets 16-2 are magnetized with different polarities. The distribution of the pincushion type magnetic field lines produced by the magnets 16-1 and 16-2 causes the R and B electron beams to change the horizontal misconvergence (commonly referred to as 'YBH') at 12 o'clock of the screen. In addition, in the 10 o'clock and 2 o'clock directions of the screen, misconvergence of the R / B electron beam in the horizontal and vertical directions (commonly referred to as 'CBH / CCV') is also changed.

The first and second magnets 16-1 and 16-2 installed as described above have a role in which magnetic force lines are arranged as shown in FIG. 9, and an electron beam (RGB) deflected upward by the pincushion type magnetic force lines thus made. ), The center part (12 o'clock) is moved to the upper side by receiving a larger magnetic force as shown in FIG. 9 and has a different amount of movement according to each position. It allows you to have linearity on the screen.

Where? Represents the movement path (direction) and deflection force (deflection strength) of the electron beam, i represents inner distortion corrected according to the movement path of the electron beam by the first magnet 16-1, and ii represents The distortion changed by the first magnet 16-1 is shown, and iii shows the distortion corrected according to the movement path of the electron beam by the second magnet 16-2.

At this time, the magnetic force lines of the first magnet 16-1 for upper and lower inner distortion correction have magnetic field lines distributed from the center portion of the screen to the upper and lower middle regions (A, A 'regions) as shown in FIG. By magnetizing so as to have magnetic force lines that can be corrected linearly, the upper and lower inner pincushion on the screen can be linearly corrected (i).

Second, when the upper and lower pincushion distortions are linearly corrected with the upper and lower inner distortion correction first magnets 16-1, as shown in FIG. 9, the distortion near the upper and lower end portions (B, B 'region) on the screen is the pincushion barrel. Form (ii).

As a means to solve this problem, a pair of magnets magnetized in the opposite direction to the upper and lower inner distortion correction first magnets 16-1 as shown in FIG. 8 in the upper and lower portions of the holder 13 opening (㉮ region) side of the deflection yoke 10. The second magnet 16-2 for vertical distortion correction is attached, respectively, and the magnetic force lines of the second magnet 16-2 for vertical distortion correction are magnetized so that the strength of the magnetic force lines is sufficient to correct the barrel distortion in a straight line. By zooming, the barrel distortion ii near the upper and lower end portions B and B 'of the screen can be corrected (iii) in a straight line as shown in FIG.

Although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention, such as changing the magnetic pole positions of the first and second magnets, may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

As described above, in the present invention, the following effects can be obtained by attaching two pairs of distortion correction first and second magnets to the deflection yoke, respectively.

First, the deflection yoke employing both the upper and lower inner pincushion distortion correction magnets of the present invention and the upper and lower pincushion correction magnets corrects the upper and lower inner pincushion distortion and the upper and lower end pincushion distortion on the screen without deteriorating the horizontal deflection sensitivity. Thus, high quality deflection yoke characteristics can be realized.

Second, the second magnet for vertical distortion correction magnetized in the opposite direction to the first magnet is a problem that the on-screen misconvergence caused by the attachment of the upper and lower inner pincushion distortion correction first magnets of the present invention, in particular, YBH and CBH deteriorates. By attaching, the half-convergence on the screen can be corrected by about 1/2, so that the characteristics of the deflection yoke that provide high quality screen characteristics can be obtained.

Claims (6)

A horizontal / vertical deflection coil for deflecting the electron beam in the horizontal and vertical directions, a ferrite core used to increase magnetic efficiency by reducing magnetic force loss of the vertical deflection magnetic field generated in the vertical deflection coil, and the horizontal / vertical deflection coil And mechanically fixed and coupled while determining the mechanical relative positions of the ferrite core and the insulator between the horizontal deflection coil and the vertical deflection coil and a vertical barrel magnetic field installed at the neck side of the holder. In deflection yoke of a cathode ray tube with a convergence yoke which improves coma aberration caused by and is mechanically coupled to the funnel by a ring band installed at the neck end of the holder: First magnets attached to upper and lower sides of the opening of the horizontal deflection coil, respectively, for correcting inner distortion of the screen; And And a second magnet attached to the upper and lower ends of the opening of the deflection yoke, the upper and lower circumferential surfaces of the holder, and including a second magnet for correcting the vertical distortion of the screen. The method of claim 1, The first magnet and the second magnet attached to the upper or lower side of the deflection yoke, A deflection yoke for cathode ray tubes, characterized in that the magnetic poles are magnetized to different positions. The method of claim 1, The first magnet attached to the upper side of the deflection yoke, A deflection yoke for cathode ray tubes, characterized in that the left side is S-pole and the right side is magnetized to N-pole when viewed from the screen side. The method of claim 1, The second magnet attached to the upper side of the deflection yoke, A deflection yoke for cathode ray tubes, characterized in that the left side is the N pole and the right side is magnetized to the S pole when viewed from the screen side. The method of claim 1, The first magnet attached to the lower side of the deflection yoke, A deflection yoke for cathode ray tubes, characterized in that the left side is the N pole and the right side is magnetized to the S pole when viewed from the screen side. The method of claim 1, The second magnet attached to the lower side of the deflection yoke, A deflection yoke for cathode ray tubes, characterized in that the left side is S-pole and the right side is magnetized to N-pole when viewed from the screen side.